Dorado Castaño, Antonio David
Total activity: 70
Areas of expertise
Biofiltration
h index
6
Professional category
Tenure-track 1 lecturers
Doctoral courses
Natural Resources and Environment
University degree
ENG. INDUST.-QUÍMICA
Research group
ERNMA - Engineering of the Natural Resources and Environment
Department
Department of Mining Engineering and Natural Resources
School
Manresa School of Engineering (EPSEM)
E-mail
toni.doradoupc.edu
Contact details
UPC directory Open in new window
Orcid
0000-0003-0238-5867 Open in new window
Scopus Author ID
24314731100 Open in new window
Collaborative networks
Links of interest
Biofiltration BTF-GO Open in new window

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Scientific and technological production
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1 to 50 of 70 results
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    Biotrickling filters for biogas sweetening: Oxygen transfer improvement for a reliable operation  Open access

     Dorado Castaño, Antonio David; Rodriguez Mary, Ginesta; Fortuny Picornell, Marc; Gabriel Buguña, David; Gamisans Noguera, Javier
    Process safety and environmental protection
    Vol. 92, num. 3, p. 261-268
    DOI: 10.1016/j.psep.2013.02.002
    Date of publication: 2014-05-01
    Journal article

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    An industrial-scale biotrickling filter for the removal of high concentrations of H2S is described in this work. The system has been operating at H2S inlet concentrations between 1000 and 3000 ppmv at acidic conditions. A decrease of pH from 2.6 to 1.8 did not affect the biological activity inside the biofilter while reducing the water make-up consumption up to 75%. The current oxygen supply system, based on direct injection of air to the liquid phase, has demonstrated to be inefficient for a long-term operation leading to elemental sulfur accumulation in the packing material (i.e. promoting clogging episodes). The present study demonstrates it is possible to partially remove (40.3%) the deposited elemental sulfur by bio-oxidation when biogas is not fed. In normal operation conditions, the implementation of an aeration system based on jet-venturi devices has shown quite promising results in terms of oxygen transfer efficiency and robustness. Such improvement of oxygen transfer was translated in a better conversion of H2S to sulfate, which increased around 17%, prolonging the lifespan operation at low-pressure drop.

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    Biofilm Oxygen Profiling using an Array of Microelectrodes on a Microfabricated Needle  Open access

     Moya, Ana; Guimera Villalba, Xavier; del Campo, F.J.; Prats-Alfonso, Elisabet; Dorado Castaño, Antonio David; Baeza Labat, Mireia; Villa, R.; Gabriel, D.; Gamisans Noguera, Javier; Gabriel, G.
    Procedia engineering
    Date of publication: 2014
    Journal article

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    A novel microelectrode array (DO-MEA) sensor was designed and fabricated using microelectromechanical systems technology on a needle for real time measurement of dissolved oxygen (DO). The sensor consisted of eleven gold disk microelectrodes and a rectangular auxiliary electrode along them. The sensor can also be operated with an integrated reference system. Three different sensor designs were fabricated, and their responses were fully characterized and evaluated. The DO-MEA sensor presented a linear response in the 0-8 mg DO·L-1 concentration range in water, displaying high sensitivity and repeatability. Knowledge of bacterial activity inside biofilms is key to the optimization of applied biotechnologies. The developed sensor was validated against a commercial Clark-type microelectrode overcoming its drawbacks, by profiling a heterotrophic biofilm cultivated in a flat-plate bioreactor. The DO-MEA sensor provided a multipoint, simultaneous dissolved oxygen snapshot profile inside a biofilm with high spatial resolution due to its micrometric dimensions, thus becoming a powerful tool for the research of many similar biological-based processes and applications.

    Postprint (author’s final draft)

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    Inventory and treatment of compost maturation emissions in a municipal solid waste treatment facilyty  Open access

     Dorado Castaño, Antonio David; Husni, Shakik; Pascual, Guillem; Puigdellivol, Carles; Gabriel Buguña, David
    Waste management
    Vol. 34, num. 2, p. 344-351
    DOI: 10.1016/j.wasman.2013.10.044
    Date of publication: 2014-02
    Journal article

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    Emissions of volatile organic compounds (VOCs) from the compost maturation building in a municipal solid waste treatment facility were inventoried by solid phase microextraction and gas chromatography¿mass spectrometry. A large diversity of chemical classes and compounds were found. The highest concentrations were found for n-butanol, methyl ethyl ketone and limonene (ppmv level). Also, a range of compounds exceeded their odor threshold evidencing that treatment was needed. Performance of a chemical scrubber followed by two parallel biofilters packed with an advanced packing material and treating an average airflow of 99,300 m3 h-1 was assessed in the treatment of the VOCs inventoried. Performance of the odor abatement system was evaluated in terms of removal efficiency by comparing inlet and outlet abundances. Outlet concentrations of selected VOCs permitted to identify critical odorants emitted to the atmosphere. In particular, limonene was found as the most critical VOC in the present study. Only six compounds from the odorant group were removed with efficiencies higher than 90%. Low removal efficiencies were found for most of the compounds present in the emission showing a significant relation with their chemical properties (functionality and solubility) and operational parameters (temperature, pH and inlet concentration). Interestingly, benzaldehyde and benzyl alcohol were found to be produced in the treatment system.

    Emissions of volatile organic compounds (VOCs) from the compost maturation building in a municipal solid waste treatment facility were inventoried by solid phase microextraction and gas chromatography–mass spectrometry. A large diversity of chemical classes and compounds were found. The highest concentrations were found for n-butanol, methyl ethyl ketone and limonene (ppmv level). Also, a range of compounds exceeded their odor threshold evidencing that treatment was needed. Performance of a chemical scrubber followed by two parallel biofilters packed with an advanced packing material and treating an average airflow of 99,300 m3 h-1 was assessed in the treatment of the VOCs inventoried. Performance of the odor abatement system was evaluated in terms of removal efficiency by comparing inlet and outlet abundances. Outlet concentrations of selected VOCs permitted to identify critical odorants emitted to the atmosphere. In particular, limonene was found as the most critical VOC in the present study. Only six compounds from the odorant group were removed with efficiencies higher than 90%. Low removal efficiencies were found for most of the compounds present in the emission showing a significant relation with their chemical properties (functionality and solubility) and operational parameters (temperature, pH and inlet concentration). Interestingly, benzaldehyde and benzyl alcohol were found to be produced in the treatment system.

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    Cr(III) removal from aqueous solutions: A straaightforward model approaching of the adsorption in a fixed-bed column  Open access

     Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Valderrama Angel, Cesar Alberto; Sole Sardans, M. Montserrat; Lao Luque, Concepcion
    Journal of environmental science and health. Part A, Toxic/hazardous substances & environmental engineering
    Vol. 49, num. 2, p. 179-186
    DOI: 10.1080/10934529.2013.838855
    Date of publication: 2014-02-07
    Journal article

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    Prediction of breakthrough curves for continuous sorption characterization is generally performed by means of simple and simplified equations. These expressions hardly have any physical meaning and, also do not allow extrapolation. A novel and simple approach, based on unsteady state mass balances, is presented herein for the simulation of the adsorption of Cr(III) ions from aqueous onto a low-cost adsorbent (leonardite). The proposed model overcomes the limitations of the commonly used analytical solution-based models without the need for complex mathematical methods. A set of experimental breakthrough curves obtained from lab-scale, fixed-bed columns was used to calibrate and validate the proposed model with a minimum number of parameters to be adjusted.

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    Mathematical modeling to optimize control strategies in an industrial biotrickling filter for biogas sweetening  Open access

     Canal, C.; Prades Martell, Lledo; Gamisans Noguera, Javier; Dorado Castaño, Antonio David
    Mediterranean Congress of Chemical Engineering
    p. 362
    Presentation's date: 2014-09-30
    Presentation of work at congresses

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    Burning biogas in a combined heat and power (CHP) plant is a promising option to reduce the emissions and the operational cost of a WWTP. However, the biogas generated in anaerobic digestion facilities in WWTPs contains average concentrations of H2S in the range from 0.1 to 0.5 vol.% which has to be removed to avoid corrosion, unnecessary production of by-products, and SO2 emissions. In a biotrickling filter (BTF), the H2S is absorbed and removed in a packed column where biomass is immobilized, being a liquid phase continuously recirculated from the bottom of the reactor. Advances in mathematical modelling of biofilters have allowed improving the knowledge of the phenomena and interactions involved in the biological desulfurization of biogas (Almenglo et al. 2013). The principal limitation for the long term operation of BTF in biogas sweetening is the accumulation of elemental sulphur due to oxygen mass transfer limitations. Apart from reducing the removal efficiency, this accumulation increases pressure drops, thus it increases the operation cost to blow the air through the bed, and force frequent maintenance tasks to replace or wash the packing material. In the present study, the dynamic model developed and validated by Rodriguez (2013) has been used to evaluate different control strategies and optimize the performance of a BTF located in the WWTP of Manresa (Barcelona). Particularly, the use of different kind of packing materials (organic and inorganic) has been evaluated to determine in different operation conditions which removal efficiency (RE) and sulphur accumulation could be expected, i.e time period of operation before the forced shutdown. Additionally, an optimal distribution of different particle sizes of materials has been proposed to reduce sulphur rate production, affecting minimally the abatement efficiencies currently obtained.

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    Microrespirometry as an effective technique for monitoring biomass growth and activity in chalcopyrite bioleaching processes  Open access

     Benzal Montes, Eva; Morral Moltó, Eloi; Guimera Villalba, Xavier; Gamisans Noguera, Javier; Sole Sardans, M. Montserrat; Dorado Castaño, Antonio David
    Mediterranean Congress of Chemical Engineering
    p. 228
    Presentation's date: 2014-09-30
    Presentation of work at congresses

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    Bioleaching is a technology that uses specific bacteria to extract valuable metals from minerals. The advantages of this technique over traditional methods (chemical leaching) include low cost, high efficiency and environment friendliness. Bioleaching allows to recovers metals from low grade ores at conditions where traditional techniques are not efficient and then, mining waste can be valorized and the impact on the environment is reduced. Chalcopyrite (CuFeS2) is the most abundant of the copper sulfides but at the same time, it is the most refractory too. The main microorganisms involved in the bioleaching of sulfide minerals are iron- and sulfur-oxidizing bacteria (Rawlings 2002). In the bioleaching process the ion Fe3+ plays an important role since it assists the process oxidizing the ore (Dorado et al. 2012). As a result, ferric iron is reduced to ferrous iron and then, the bacteria catalyze the cyclic regeneration of ferrous to ferric to promote continuous leaching of the sulfide mineral. However, Fe3+ ions have a low solubility and they can lead to the precipitation of iron (III) hydroxides and other ferric complexes such as jarosite, depending on the impurities of the mineral and the mineral medium used to keep the biological activity. The precipitation affects negatively the mass transfer process and it causes the decrease in the extraction yield of the metal (Zhang et al. 2008). Moreover, the presence of precipitates makes the optical methods of monitoring not suitable for controlling the process. In this case, the use of microrespirometry allows the monitoring of biomass growth by means of low sampling volume (<1mL) and high precision. Additionally, negative effects over the activity of microorganisms can be detected immediately and corrected. In this work, the microrespirometry was used to evaluate the effect of the mineral medium composition in the bioleaching of copper from a chalcopyrite ore. The microbial consortium was obtained from a biotrickling filter treating high loads of H2S and the copper extraction efficiency was monitored by atomic absorption. As an example, Figure 1 shows the evolution of the respirometric rates at different moments along the experiment.

  • Exploring sulfur-oxidizing biofilms in a gas-phase flat-plate bioreactor under controlled ph

     Prades Martell, Lledo; Guimera Villalba, Xavier; Gabriel, D.; Dorado Castaño, Antonio David; Gamisans Noguera, Javier
    Mediterranean Congress of Chemical Engineering
    p. 356
    Presentation's date: 2014-09-30
    Presentation of work at congresses

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    Biological removal of hydrogen sulfide (H2S) with biotrickling filters has become a good economic alternative to traditional physical-chemical methods used for treating air emissions (Kim and Deshusses, 2005). However, although the technology has been widely tested, there is a lack of knowledge in the degradation phenomena taking place within biofilms. Therefore it is essential to conduct studies to monitor biofilm and clarify its role in the process of biofiltration in order to optimize this technology. To carry out studies at laboratory-scale, biofilms growth in industrial reactors may be reproduced by constructing and operating suitable laboratory biofilm reactors. In the design of such experimental set-ups, it should be considered the type of reactor, the biological process to be developed and the necessary measurements in the study of biofilms (Lewandowski and Beyenal, 2007). In this work a gas-phase flat-plate (GPFP) bioreactor was used to grow sulfur-oxidizing biofilms under similar conditions to those found in industrial biotrickling filters applied to the biological sweetening of biogas.

  • Development of a multi-analyte microelectrode array sensor for biofilm profiling

     Guimera Villalba, Xavier; Moya, A.; Dorado Castaño, Antonio David; Gabriel, D.; Gabriel, G.; Gamisans Noguera, Javier
    Mediterranean Congress of Chemical Engineering
    p. 373
    Presentation's date: 2014-09-30
    Presentation of work at congresses

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    The multiple advantages offered by biofiltration techniques have caused a growing interest in their development, becoming an alternative to conventional waste-water and waste-gases treatment processes. In both biofilters and biotrickling filters, pollutants are removed being transferred from a gas or liquid phase to a biofilm formed by bacteria growing in a supporting bed. Pollutants are degraded by the bacteria inside biofilm, which gives to biofilms a predominant role in biofiltration technologies. However, the impossibility of performing measurements inside biofilms hinders the optimization of such equipment since only bulk gas and liquid phases measurements are available. The technical difficulties for obtaining measurements within biofilms have been solved by the development of microsensors. In recent years microsensors have become a useful tool for performing measurements of different chemical species within biofilms with a high spatial and temporal resolution and minimum disturbances. Among the different microsensors available for biofilm monitoring, Clark-type ones are the most commonly used. However, these sensors are handcrafted from pulled glass Pasteur pipettes and, thus, present important drawbacks (Wu et al. 2005). Main limitations are the fragility and high cost per device, the sensitivity variability between different probes and the fact that they are limited to a single analyte. Microfabrication techniques allow advancing in the biofilm profiling approach. This technology enable the design of tailored microelectrodes adapted to the application, thus allowing the microfabrication of electrodes (and their arrays) of different sizes, geometries and arrangements for the monitoring of different species. Furthermore, the cost-effectiveness and mass-production of the microsensors fabricated using the microfabrication techniques makes them a clear and promising alternative for biofilm monitoring.

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    Biofilm oxygen profiling using an array of microelectrodes on a microfabricated needle  Open access

     Moya, A.; Guimera Villalba, Xavier; del Campo, F.J.; Prats-Alfonso, E.; Dorado Castaño, Antonio David; Baeza Labat, Mireia; Villa, R.; Gabriel Buguña, David; Gamisans Noguera, Javier
    Eurosensors
    p. 1-4
    Presentation's date: 2014-09-07
    Presentation of work at congresses

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    Knowledge of bacterial activity inside biofilms is key to the optimization of applied biotechnologies. A novel dissolved oxygen microelectrode array (DO-MEA) sensor has been designed and fabricated on a needle using microelectromechanical systems technology, in order to provide a multipoint, simultaneous dissolved oxygen snapshot profile inside a biofilm. The sensor consisted of eleven gold disk electrodes with integrated counter (CE) and pseudo-reference (RE) electrodes. Three different sensor designs are fabricated, and their responses are fully characterized and evaluated under different environmental conditions. The developed sensor is validated against a commercial Clark-type microelectrode overcoming its drawbacks, by profiling a heterotrophic biofilm cultivated in a flat-plate bioreactor. The DO-MEA sensor will be improved with the protection of the electrodes and will be fabricated on a thinner substrate, for becoming a powerful tool for the research of many similar biological-based processes and applications.

  • Elaboración de materiales docentes interactivos aplicados a la experimentación en bioingeniería

     Bonsfills Pedros, Ana; Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Lao Luque, Concepcion; Sole Sardans, M. Montserrat
    Congreso de Innovación Docente en Ingeniería Química
    p. 38
    Presentation's date: 2014-01-24
    Presentation of work at congresses

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    Optimization of oxygen transfer through membrane diffusers for biological sweetening of biogas  Open access

     Rodriguez Ginesta, Anna; Dorado Castaño, Antonio David; Bonsfills Pedros, Ana; Gabriel Buguña, David; Gamisans Noguera, Javier
    Chemical engineering and technology
    Vol. 36, num. 3, p. 513-518
    DOI: 10.1002/ceat.201200603
    Date of publication: 2013
    Journal article

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    Biological techniques for the removal of gaseous pollutants such as hydrogen sulfide (H2S) have proved to be effective, environmentally friendly, and economically viable. However, when high concentrations of H2S are treated, the process is severely restricted by the oxygen deficit in the liquid phase. The oxygen transfer efficiency provided by a membrane diffuser is evaluated under typical pressure and salinity conditions used for the biological treatment of H2S in biogas. The optimal operating parameters for enhanced oxygen transfer were determined. The addition of pure oxygen with a membrane diffuser to increase the oxygen transfer rate and the use of a nonaqueous phase to improve oxygen transfer in a bioscrubber system are also evaluated.

    Postprint (author’s final draft)

  • Characterization of chromium (III) removal from aqueous solutions by an immature coal (leonardite). Toward a better understanding of the phenomena involved

     Lao Luque, Concepcion; Sole Sardans, M. Montserrat; Gamisans Noguera, Javier; Valderrama Angel, Cesar Alberto; Dorado Castaño, Antonio David
    Clean technologies and environmental policyB
    p. 1-10
    DOI: 10.1007/s10098-013-0610-x
    Date of publication: 2013-03-30
    Journal article

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    Removal of chromium (III) from aqueous solutions by leonardite (a low-cost adsorbent) was studied in a series of batch experiments. Stabilization of the adsorbent material with alginate beads was also investigated. The extent of adsorption was evaluated as a function of the solution pH, contact time, and the adsorbate concentration. Cr(III) removal was pH dependent, reaching a maximum at a pH range of 4¿5. Kinetic studies allowed gives relevant information regarding mass transfer processes involved during the sorption process. Equilibrium data fitted well to both the Langmuir and Freundlich isotherm models and the maximum adsorption capacity turned out to be 75.2 mg Cr(III) g-1. Encapsulation of leonardite in alginate beads resulted in a slightly lower adsorption capacity.

  • DESARROLLO DE UNA NUEVA GENERACIÓN DE NANOESTRUCTURAS PARA LA ELIMINACIÓN DE GASES DE EFECTO INVERNADERO

     Dorado Castaño, Antonio David; Gamisans Noguera, Javier
    Competitive project

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  • Monitorización, modelización y control para la optimización de biofiltros percoladores de desulfuración anóxicos y aerobios

     Bonsfills Pedros, Ana; Gamisans Noguera, Javier; Lao Luque, Concepcion; Dorado Castaño, Antonio David; Sole Sardans, M. Montserrat
    Competitive project

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  • Development of a novel microsensor for the study of oxygen profiles in biofilms

     Guimera Villalba, Xavier; Prats Alfonso, Elisabet; Dorado Castaño, Antonio David; Villa, Rosa; Gamisans Noguera, Javier; Gabriel Buguña, David; Gabriel, Gemma
    International Conference on Biotechniques for Air Pollution Control and Bioenergy
    p. 275-285
    Presentation's date: 2013-09-11
    Presentation of work at congresses

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    Understanding of the processes taking place inside biofilms is a key parameter to progress in the optimization of biofiltration technologies. This study was conducted with the aim of developing a novel dissovled oxygen (DO) microsensor specially designed for biofilms monitoring. The microsensor was fabricated through standard photolithography techniques, resulting in a microelectrodes array (MEA) of 11 gold circular working electrodes, with a diameter of 50 µm , and a gold reference electrode, which allows obtaining a snapshot oxygen profile of 1 mm of depth. The performance of the sensor was fully characterized under different conditions, inwhich the sensor presented high sensitivity and repeatability, and low detection and quantification limits. Monitoring of sensor performance showed a stable and reliable response. The developed sensor was used in obtaining micropofiles in an aerobic heterotrophic biofilm, showing similar response to Clark-type commercial microsensors. These studies concluded that the novel MEA sensor for DO monitoring allows obtaining oxygen profiles within biofilms, becoming a useful tool for the research of many biological applications.

  • Modeling and control strategies development for anoxic biotrickling filtration

     Almenglo, Fernando; Ramírez, Martín; Gómez, José Manuel; Cantero, Domingo; Gamisans Noguera, Javier; Dorado Castaño, Antonio David
    International Conference on Biotechniques for Air Pollution Control and Bioenergy
    p. 123-131
    Presentation's date: 2013-09-11
    Presentation of work at congresses

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    The aim of this work was to evaluate different operational modes in an anoxic biotrickling filter (BTF) by means of a dynamic model. The model was calibrated and validated satisfactorily with experimental data from a pilot-scale anoxic biotrickling filter plant for biogas sweetening. Model simulations allowed to find the optimal mode operation and predicting the biotrickling filter behavior.

  • Conversion of chemical scrubbers to biotrickling filters for VOCs and H2S treatment at low contact times

     Guimera Villalba, Xavier; Dorado Castaño, Antonio David; Santos, Alfredo; Gamisans Noguera, Javier; Gabriel Buguña, David
    International Conference on Biotechniques for Air Pollution Control and Bioenergy
    p. 193-203
    Presentation's date: 2013-09-11
    Presentation of work at congresses

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    The purpose of this work was to evaluate the technical and economical feasibility of converting three in-series chemical scrubbers to biotrickling filters for the simultaneous removal at neutral pH of 10.000 m3 h-1 containing H2S and volatile organic compounds (VOCs) at a wastewater treatment plant (WWTP). The conversion was based on previous conversion protocols and mainly required of replacing the original packing material by a structured packing and recycle pumps, besides modifying the controls and operation of the reactors. Almost complete removal of HsS and VOCs was found 10 and 20 days after startup, respectively. Under the conditions at the WWTP, i.e., a gas contact time of about 1.4 seconds per reactor and pH controlled between 6.5 and 6.8, inlet average concentrations below 10 ppm, of H2S and below 5 ppm, for VOCs were completely degraded in the reactors. The first and second reactors played a major role in the H2S degradation.

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    Biofiltration of WWTP sludge composting emission at contact times of 2 to 8 seconds  Open access

     Dorado Castaño, Antonio David; Gabriel Buguña, David; Gamisans Noguera, Javier
    IWA Specialized Conference on Odors and Air Emissions jointly Conference on Biofiltration for Air Pollution Control
    p. 1-8
    Presentation's date: 2013-03-05
    Presentation of work at congresses

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    The performance of a biotrickling filter for the abatement of composting emissions was evaluated at short contact times of 2 to 8 seconds. The effect of EBRT, pH control and water renovation rate were evaluated. The average elimination capacity was 13 and 3.3 g N/C m-3 h -1 for ammonia and VOCs, respectively, and the maximum EC obtained during a doping process were 40 and 20 g N/C m -3 h -1 . Biotrickling filters appear as a better alternative than biofilters due to their controllability. However, water renovation becomes a critical parameter to avoid substrate inhibition by nitrite and ammonia accumulation. Not only ammonia absorption is negatively affected at low renovation rate but it is also affected the biological process. A decrease of 40 % was detected in the nitrification step when the hydraulic residence time increased from 2 to 5 hours. Results presented herein demonstrate that high removal efficiencies can be achieved for composting emissions in a biotrickling filter operated at short contact times which entails a substantial reduction of operational and investment costs in comparison to traditional techniques.

    Postprint (author’s final draft)

  • Elaboració de materials docents interactius aplicats a l'experimentació en bioenginyeria

     Bonsfills Pedros, Ana; Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Lao Luque, Concepcion; Sole Sardans, M. Montserrat
    Jornada d'Innovació Docent UPC
    p. 1-5
    Presentation's date: 2013-02-08
    Presentation of work at congresses

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  • Conversion of chemical scrubbers to biotrickling filters for VOCs and H2S treatment at low contact times

     Guimera Villalba, Xavier; Dorado Castaño, Antonio David; Santos, Alfredo; Gamisans Noguera, Javier; Gabriel Buguña, David
    Date of publication: 2013-09
    Book chapter

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  • Development of a novel microsensor for the study of oxygen profiles in biofilms

     Guimera Villalba, Xavier; Moya, Ana; Prats-Alfonso, Elisabet; Dorado Castaño, Antonio David; Villa, Rosa; Gamisans Noguera, Javier; Gabriel Buguña, David; Gabriel, Gemma
    Date of publication: 2013-09
    Book chapter

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  • Modeling and control strategies for anoxic biotrickling filtration

     Almengló, Fernando; Ramírez, Martín; Gómez, José Manuel; Cantero, Domingo; Gamisans Noguera, Javier; Dorado Castaño, Antonio David
    Date of publication: 2013-09
    Book chapter

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  • Biomass accumulation effect on the hydrodynamics of an alkaline biotrickling filter treating dimethyl disulfide vapors: experimental determination towards a dynamic model description

     Arellano-Garcia, Luis; Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Revah, Sergio
    Date of publication: 2013-09
    Book chapter

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  • Eliminació de H2S mitjançant biofiltres percoladors: millora de la transferència d'oxigen.  Open access

     Rodriguez Mary, Ginesta
    Universitat Politècnica de Catalunya
    Theses

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    En l¿actual context de crisi energètica i canvi climàtic, l¿aprofitament energètic del biogàs ha guanyat rellevància, donat que s¿obté energia a partir dels residus i, alhora, es minimitza l¿emissió de metà a l¿atmosfera. Tanmateix, el biogàs conté entre 0.1-0.5 % v/v de H2S (1000¿5000 ppmv), el qual ha de ser eliminat per tal d¿aprofitar energèticament el biogàs, ja que, a part de desprendre una forta olor desagradable, al cremar és convertit en espècies altament corrosives, perjudicials per la salut i el medi ambient, com són els òxids de sofre i l¿àcid sulfúric. En aquest sentit, els tractaments biològics han demostrat ésser molt competitius enfront les tècniques fisicoquímiques, ja que no requereixen l¿addició de reactius, aprofitant el metabolisme dels microorganismes per tal d'oxidar els possibles contaminants.La transferència de l¿oxigen a la fase aquosa és un factor clau per al correcte funcionament dels biofiltres percoladors, ja que per cada mol de sulfur d¿hidrogen que es degrada són necessaris dos mols d¿oxigen. En condicions de dèficit d¿oxigen a la fase líquida, la reacció d'oxidació no es completa, i s¿acumula sofre (producte intermedi) al material de rebliment de l¿equip. El sofre és un sòlid pastós i, per tant, la seva acumulació augmenta els costos d¿operació. Eventualment, si no es duu a terme una acció correctora, pot arribar a obturar totalment el biofiltre.S¿ha estudiat el procés de biofiltració operant un biofiltre a escala industrial, que permet eliminar entre 2000-2500 ppmv de H2S amb un cabal de gas mitjà de 80 m3 h-1. La reducció del pH d¿operació en 0.8 unitats ha reportat una reducció del 78 % del consum d¿aigua, que s¿usa per a la regulació del pH. S¿ha comprovat la viabilitat de l¿oxidació biològica de part del sofre acumulat a l¿equip, eliminant el 40 % del sofre acumulat a l¿equip en 21 dies.En el present estudi es proposa l¿ús de dispositius intensius d¿aeració, com són els dispositius venturi, per tal de poder subministrar la quantitat necessària d¿oxigen per maximitzar la formació de sulfat. Aquest és posteriorment eliminat de l¿equip mitjançant purgues de la fase líquida. Per a aquest fi s¿han estudiat tres dispositius d¿aeració comercials: un difusor de membrana, un ejector venturi i un jet venturi, en condicions d¿operació similars a les que es donen en la biofiltració del sulfur d¿hidrogen. S¿han realitzat experiments en condicions similars a les que es donen en la biofiltració del sulfur d¿hidrogen present al biogàs: pressió superior a l¿atmosfèrica i presència de sulfat a la fase líquida. També s¿ha estudiat l¿efecte de la configuració del venturi, realitzant mesures de pèrdua de càrrega al llarg del dispositiu. Amb el difusor de membrana s¿ha determinat l¿efecte d¿addicionar una fase no aquosa, per tal de maximitzar la transferència d¿oxigen, i l¿ús d¿oxigen pur enlloc d¿aire.L¿equip que ha estat seleccionat, degut a la seva idoneïtat en base al seu consum energètic i l¿eficàcia en la transferència d¿oxigen, ha estat el jet venturi. Aquest dispositiu ha estat implementat en un biofiltre a escala industrial, reportant una millora en la conversió a sulfat del 32 %, amb una reducció del subministrament d¿aire del 78 %. L¿operació del biofiltre amb el jet venturi s¿ha traduït en una millora en la robustesa del sistema, ja que operant amb aquest dispositiu quan la càrrega d¿entrada disminueix s¿oxida parcialment el sofre acumulat a l¿equip, mentre que amb el compressor, quan disminuïa el cabal de biogàs a tractar es parava l¿entrada d¿aire, empitjorant els problemes d¿acumulació de sofre.Finalment, s¿ha desenvolupat un model matemàtic que permet predir la formació de sofre i sulfat, fet que no havia estat reportat fins al moment. Aquest model ha estat ajustat i validat per dos biofiltres: un a escala laboratori i un a escala industrial. S¿ha obtingut un ajust satisfactori de les dadades experimentals i les simulades.

    In the current energy crisis and climate change context, energy use of biogas has gained relevance, since it is possible to get energy from waste, and also minimizes the emission of methane into the atmosphere. However, biogas contains between 0.1-0.5% v / v H2S (1000-5000 ppmv), which must be removed in order to produce energy because, apart from producing a strong odor, its combustion mighty generate highly corrosive species, harmful to health and the environment, such as sulfur oxides and sulfuric acid. In this sense, biological treatments have proved to be very competitive when compared to physicochemical techniques, since they do not require the addition of reagents, using the metabolism of microorganisms to oxidize potential contaminants. Oxygen transfer to the aqueous phase is key to the proper operation of biotrickling filters, since for each mole of hydrogen sulfide degraded two moles of oxygen are required. Under conditions of oxygen deficit in the liquid phase, the oxidation reaction is not complete, thus accumulating elemental sulfur (an intermediate product) in the filter packing material. Sulfur is an insoluble pasty solid and, therefore, its accumulation increases operating costs. Eventually, if corrective actions are not scheduled, the biofilter can become completely clogged. The biofiltration process of an industrial scale biotrickling filter, which eliminates between 2000-2500 ppmv H2S at a gas flowrate of 80 m3 h-1 has been studied. The reduction of 0.8 pH units in the operation reported a 78% reduction in water consumption, which is used to regulate the pH. The viability of the biological oxidation of sulfur accumulated on the computer was checked, eliminating 40% of the sulfur accumulated on the packed bed in 21 days. This study proposes the use of intensive aeration equipment such as venturi devices, in order to supply the necessary amount of oxygen to maximize the formation of sulfate. Sulfate is finally removed from the biofilter by purging the liquid phase. For this purpose, three commercial aeration devices have been tested: a membrane diffuser, a jet-venturi and an venturi-efector operating at conditions similar to those usually found in biofiltration of hydrogen sulfide. Experiments were carried out under conditions similar to those that occur in biofiltration of hydrogen sulfide present in biogas: pressure greater than atmospheric pressure and the presence of sulfate in the liquid phase. Also, the effect of venturi configuration was tested by measuring the pressure drop along the device. With the diffuser membrane the effect of adding a non-aqueous phase in order to maximize oxygen transfer and the use of pure oxygen instead of air was studied. An intensive gas-liquid contactor (jet-venturi) was selected based on its energy consumption and efficiency in oxygen transfer. This device was implemented in an industrial scale biotrickling filter, reporting an improved conversion to sulfate (32%), with a 78% reduction of air supply. The operation of the biofilter with the jet-venturi resulted in an improvement in robustness and reliability of the desulfurizing system. Finally, a mathematical model that predicts the formation of sulfur and sulfate was developed. This rigorous model approach had not been reported until now. The model was calibrated and validated in two biofilters: a lab-scale and an industrial scale. A satisfactory fitting of the experimental and simulated data was obtained.

    En l’actual context de crisi energètica i canvi climàtic, l’aprofitament energètic del biogàs ha guanyat rellevància, donat que s’obté energia a partir dels residus i, alhora, es minimitza l’emissió de metà a l’atmosfera. Tanmateix, el biogàs conté entre 0.1-0.5 % v/v de H2S (1000–5000 ppmv), el qual ha de ser eliminat per tal d’aprofitar energèticament el biogàs, ja que, a part de desprendre una forta olor desagradable, al cremar és convertit en espècies altament corrosives, perjudicials per la salut i el medi ambient, com són els òxids de sofre i l’àcid sulfúric. En aquest sentit, els tractaments biològics han demostrat ésser molt competitius enfront les tècniques fisicoquímiques, ja que no requereixen l’addició de reactius, aprofitant el metabolisme dels microorganismes per tal d’oxidar els possibles contaminants. La transferència de l’oxigen a la fase aquosa és un factor clau per al correcte funcionament dels biofiltres percoladors, ja que per cada mol de sulfur d’hidrogen que es degrada són necessaris dos mols d’oxigen. En condicions de dèficit d’oxigen a la fase líquida, la reacció d'oxidació no es completa, i s’acumula sofre (producte intermedi) al material de rebliment de l’equip. El sofre és un sòlid pastós i, per tant, la seva acumulació augmenta els costos d’operació. Eventualment, si no es realitza una acció correctora, pot arribar a obturar totalment el biofiltre. S’ha estudiat el procés de biofiltració operant un biofiltre a escala industrial, que permet eliminar entre 2000-2500 ppmv de H2S amb un cabal de gas mitjà de 80 m3 h-1. La reducció del pH d’operació en 0.8 unitats ha reportat una reducció del 78 % del consum d’aigua, que s’usa per a la regulació del pH. S’ha comprovat la viabilitat de l’oxidació biològica de part del sofre acumulat a l’equip, eliminant el 40 % del sofre acumulat a l’equip en 21 dies. En el present estudi es proposa l’ús de dispositius intensius d’aeració, com són els dispositius venturi, per tal de poder subministrar la quantitat necessària d’oxigen per maximitzar la formació de sulfat. Aquest és posteriorment eliminat de l’equip mitjançant purgues de la fase líquida. Per a aquest fi s’han estudiat tres dispositius d’aeració comercials: un difusor de membrana, un ejector venturi i un jet venturi, en condicions d’operació similars a les que es donen en la biofiltració del sulfur d’hidrogen. S’han realitzat experiments en condicions similars a les que es donen en la biofiltració del sulfur d’hidrogen present al biogàs: pressió superior a l’atmosfèrica i presència de sulfat a la fase líquida. També s’ha estudiat l’efecte de la configuració del venturi, realitzant mesures de pèrdua de càrrega al llarg del dispositiu. Amb el difusor de membrana s’ha determinat l’efecte d’addicionar una fase no aquosa, per tal de maximitzar la transferència d’oxigen, i l’ús d’oxigen pur enlloc d’aire. L’equip que ha estat seleccionat, degut a la seva idoneïtat en base al seu consum energètic i l’eficàcia en la transferència d’oxigen, ha estat el jet venturi. Aquest dispositiu ha estat implementat en un biofiltre a escala industrial, reportant una millora en la conversió a sulfat del 32 %, amb una reducció del subministrament d’aire del 78%. L’operació del biofiltre amb el jet venturi s’ha traduït en una millora en la robustesa del sistema, ja que operant amb aquest dispositiu quan la càrrega d’entrada disminueix s’oxida parcialment el sofre acumulat a l’equip, mentre que amb el compressor, quan disminuïa el cabal de biogàs a tractar es parava l’entrada d’aire, empitjorant els problemes d’acumulació de sofre. Finalment, s’ha desenvolupat un model matemàtic que permet predir la formació de sofre i sulfat, fet que no havia estat reportat fins al moment. Aquest model ha estat ajustat i validat per dos biofiltres: un a escala laboratori i un a escala industrial. S’ha obtingut un ajust satisfactori de les dades experimentals i les simulades.

  • Biomass accumulation effect on the hydrodynamics of an alkaline biotrickling filter treating dimethyl disulfide vapors: experimental determination towards a dynamic model description

     Arellano García, Luis; Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Revah, Sergio
    International Conference on Biotechniques for Air Pollution Control and Bioenergy
    p. 267-274
    Presentation's date: 2013-09-11
    Presentation of work at congresses

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    The biomass accumulation effect on the performance of a biotrickling filter (BTF) has been assessed in termps of the hydrodynamics and the void space available to gas treatment changes. It was determined tht the available space for gas treatment inside the BTF had been reduced to almost half of that calculated initially when packing was biofilm free. Assuming that flow of liquid through a BTF can be described by the dispersion plug flow model, dispersion coefficients (Ddisp) of 0,12 and 0,33 m2 h-1 were determined when BTF was packed with clean and colonized packing respectively. These coefficients and other parameters assessed experimentally were used in a mathematical model to describe the dimethyl disulfide (DMDS) odors removal along the BTF height. The model that considered dispersion for the liquid flow fitted better to the experimental data, suggesting the importance of the axial dispersion which should be considered when modelling.

  • Premi Extraordinari de Doctorat 2012 a la millor tesi doctoral en l'àmbit d'Enginyeria Industrial llegida en el any acadèmic 2009-2010.

     Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Gabriel Buguña, David
    Award or recognition

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    Interaction between sorption and biodegradation in a biofilter packed with activated carbon  Open access

     Dorado Castaño, Antonio David; Lafuente Sancho, Francisco Javier; Gabriel Buguña, David; Gamisans Noguera, Javier
    Water science and technology
    Vol. 66, num. 8, p. 1743-1750
    DOI: 10.2166/wst.2012.384
    Date of publication: 2012
    Journal article

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    The main objective of this study is to evaluate qualitatively and quantitatively the effect of starvation periods in the biodegradation capacity of microorganisms when the support media is a material with high sorption capacity. Pollutant sorption and biodegradation, which occur simultaneously in the biofilter, describe the overall behavior of the air treatment system during normal operation and during starvation periods. Results obtained in the present study demonstrate that sorption capacity of the material not only plays an important role during the start-up of operation, but it is also important in the steady operation. Simultaneously, as biomass grows on the support, biodegradation becomes more decisive in the performance. It was found that zones of packing material with low moisture content are controlled by the sorption mechanism, at expenses of biodegradation, and they are essential as pollutant reservoir during starvation periods. In the present study a significant decrease in the biodegradation capacity of microorganisms immobilized on activated carbon were not observed as consequence of continuously load interruptions.

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    Effect of pH and Fe(III) ions on chalcopyrite bioleaching by an adapted consortium from biogas sweetening  Open access

     Dorado Castaño, Antonio David; Sole Sardans, M. Montserrat; Lao Luque, Concepcion; Alfonso Abella, María Pura; Gamisans Noguera, Javier
    Minerals engineering
    Vol. 39, p. 36-38
    DOI: 10.1016/j.mineng.2012.06.009
    Date of publication: 2012
    Journal article

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    Bacterial leaching of metal sulfides offers a low cost and an environmentally friendly technology for valuable metals recovering. Particle size, inoculum, pH and ferric ion affect the process of bioleaching of copper from chalcopyrite ores. In the case of low grade ores, the effect of these key parameters is critical to determine the viability of the technique. Moreover, there is not a total agreement on the optimal operation conditions to obtain high recover efficiencies of the metal. In the study presented herein a low-grade copper sulfide ore was subjected to bioleaching process using a mixed microbial consortium obtained from a biotrickling filter treating high loads of H2S. Experiments were performed comparing with bacteria from different origin, different mineral particle size, medium pH and additional ion ferric concentrations as leaching agent. After 1300 hours of operation, the total copper recovery achieves a value of 50 % in the most acidic conditions. A decrease of 2.5 units of pH implies an increase in the efficiency of 35% under these conditions. It was also observed an optimal particle size (between 2 and 3 mm), considerably higher than previous studies, meaning a decrease in operational cost to mill material. Finally, results indicate that the presence of additional ferric ion improves the performance of bioleaching but there is a threshold concentration from which the system is not sensitive (500 ppm).

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  • Eficacia de las tecnologías de reducción de olores en la red de alcantarillado de Sídney (Australia)

     Dorado Castaño, Antonio David; Stuetz, R.
    Conferencia sobre Gestión de Olores en el Medio Ambiente
    p. 1-7
    Presentation's date: 2012-11-27
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  • Biomass accumulation in a biofilter treating toluene at high loads ¿ Part 1: Experimental performance from inoculation to clogging

     Dorado Castaño, Antonio David; Baeza, Juan Antonio; Lafuente, Javier; Gabriel Buguña, David; Gamisans Noguera, Javier
    Chemical engineering journal
    Vol. 209, p. 661-669
    DOI: 10.1016/j.cej.2012.08.018
    Date of publication: 2012-10-15
    Journal article

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  • Biomass accumulation in a biofilter treating toluene at high loads ¿ Part 2: Model development, calibration and validation

     Dorado Castaño, Antonio David; Lafuente Sancho, Francisco Javier; Gabriel Buguña, David; Gamisans Noguera, Javier
    Chemical engineering journal
    Vol. 209, p. 670-676
    DOI: 10.1016/j.cej.2012.08.019
    Date of publication: 2012
    Journal article

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  • Optimization of oxygen transfer through venturi-based systems applied to the biological sweetening of biogas

     Rodriguez Ginesta, Anna; Dorado Castaño, Antonio David; Bonsfills Pedros, Ana; Sanahuja Moliner, Ricard; Gabriel Buguña, David; Gamisans Noguera, Javier
    Journal of chemical technology & biotechnology
    Vol. 87, num. 6, p. 854-860
    DOI: 10.1002/jctb.3731
    Date of publication: 2012-02-01
    Journal article

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  • Elaboració de materials docents interactius en enginyeria química: bescanviadors de calor  Open access

     Bonsfills Pedros, Ana; Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Lao Luque, Concepcion; Sole Sardans, M. Montserrat
    Jornada d'Innovació Docent UPC
    p. 1-5
    Presentation's date: 2012-02-07
    Presentation of work at congresses

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  • Página web planta piloto de secado de sólidos

     Bonsfills Pedros, Ana; Gamisans Noguera, Javier; Lao Luque, Concepcion; Sole Sardans, M. Montserrat; Dorado Castaño, Antonio David
    Congreso de Innovación Docente en Ingeniería Química
    p. 16
    Presentation's date: 2012-01-27
    Presentation of work at congresses

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  • Página web Intercambiadores de calor

     Bonsfills Pedros, Ana; Gamisans Noguera, Javier; Lao Luque, Concepcion; Sole Sardans, M. Montserrat; Dorado Castaño, Antonio David
    Congreso de Innovación Docente en Ingeniería Química
    p. 15
    Presentation's date: 2012-01-27
    Presentation of work at congresses

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  • Fira del Coneixement 2011

     Grau Vilalta, Maria Dolors; Font Soldevila, Jose; Dorado Castaño, Antonio David
    Collaboration in exhibitions

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  • Què és l'enginyeria química?

     Grau Vilalta, Maria Dolors; Bonsfills Pedros, Ana; Casas Sabata, Jose Maria; Dorado Castaño, Antonio David; Gamisans Noguera, Javier
    Collaboration in exhibitions

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  • La química i la societat

     Grau Vilalta, Maria Dolors; Font Soldevila, Jose; Sanz Balague, Joaquim; Guaus Guerrero, Ester; Calvet Tarragona, Aurelio; Salán Ballesteros, Mª Núria; Martínez Martínez, María R.; Farran Marsa, Adriana; Gorchs Altarriba, Roser; Alvarez Del Castillo, M. Dolores; Garrido Soriano, Nuria; Morillo Cazorla, Margarita; Almajano Pablos, Maria Pilar; Cardona Planes, Anna Maria; Macanás de Benito, Jorge; Bonsfills Pedros, Ana; Gamisans Noguera, Javier; Dorado Castaño, Antonio David; Lao Luque, Concepcion; Torrent Burgues, Juan; Molins Duran, Gemma; Colom Fajula, Xavier; Carrillo Navarrete, Fernando; Ramon Portés, Eva; Garriga Sole, Pere; Sole Sardans, M. Montserrat; Ardanuy Raso, Monica; Pares Sabates, Ferran; Roncero Vivero, Maria Blanca; Cusola Aumedes, Oriol
    Collaboration in exhibitions

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  • Optimización de recursos y mitigación de la contaminación ambiental producida por la minería en Bolivia

     Dorado Castaño, Antonio David; Alfonso Abella, María Pura; Parcerisa Duocastella, David; Mata Perello, Jose Maria; Casas Sabata, Jose Maria; Oliva Moncunill, Josep; Torró Abat, Lisard; Melgarejo Draper, Joan Carles; Higueras Higueras, Pablo Leon; Llanos Lazcano, Willians; Canet Miquel, Carles; Martin Romero, Francisco; Zamora Echenique, Gerardo; Rodríguez Lafuente, Mariel; Zambrana Martínez, Rubén Néstor; Loredo, Valentín; Peñarrieta Venegas, Lía; Cortez Torrez, José Antonio; Villegas Flores, Karla Stephanie; Arancibia Balderrama, Hanz Jhony
    Competitive project

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  • Utilisation of activated carbon in biofilters for elimination of industrial waste gases

     Gabriel Buguña, David; Prado, Óscar Jesús; Lafuente, Javier; Gamisans Noguera, Javier; Maestre, Juan P.; Hernández, Jerónimo; Dorado Castaño, Antonio David
    Date of publication: 2011
    Book chapter

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  • A comparative study of oxygen transfer devices applied to biological sweetening of biogas

     Rodriguez Mary, Ginesta; Dorado Castaño, Antonio David; Bonsfills Pedros, Ana; Sanahuja Moliner, Ricard; Gamisans Noguera, Javier; Gabriel Buguña, David
    Mediterranean Congress of Chemical Engineering
    Presentation's date: 2011-11-17
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  • Performance of a biotrickling filter for the removal of hydrogen sulfide present in biogas

     Rodriguez Mary, Ginesta; Dorado Castaño, Antonio David; Bonsfills Pedros, Ana; Gamisans Noguera, Javier; Gabriel Buguña, David
    Mediterranean Congress of Chemical Engineering
    Presentation's date: 2011-11-18
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  • Optimization of oxygen transfer through venturi-based systems applied to the biological sweetening of biogas

     Rodriguez Mary, Ginesta; Dorado Castaño, Antonio David; Bonsfills Pedros, Ana; Sanahuja Moliner, Ricard; Gamisans Noguera, Javier; Gabriel Buguña, David
    International Conference on Biotechniques for Air Pollution Control
    p. 27-33
    Presentation's date: 2011-10-12
    Presentation of work at congresses

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  • Adsorción de compuestos emergentes por medio de distintos carbones activados

     Llado Valero, Jordi; Ruiz Bobes, Begoña; Fuente Alonso, Enrique; Sole Sardans, M. Montserrat; Dorado Castaño, Antonio David; Lao Luque, Concepcion
    Reunión del Grupo Español del Carbón
    p. 252-253
    Presentation's date: 2011-10
    Presentation of work at congresses

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  • Interaction between sorption and biodegradation in a biofilter packed with activated carbon

     Dorado Castaño, Antonio David; Lafuente, Javier; Gabriel Buguña, David; Gamisans Noguera, Javier
    IWA Conference on Odours and VOCs
    p. 1-11
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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  • Elaboració de materials docents interactius aplicats a l'experimentació en enginyeria química  Open access

     Bonsfills Pedros, Ana; Dorado Castaño, Antonio David; Gamisans Noguera, Javier; Lao Luque, Concepcion; Sole Sardans, M. Montserrat
    Jornada d'Innovació Docent UPC
    Presentation's date: 2011-02-02
    Presentation of work at congresses

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  • The role of water in the performance of biofilters: parameterization of pressure drop and sorption capacities for common packing materials

     Dorado Castaño, Antonio David; Lafuente, Javier; Gamisans Noguera, Javier; Gabriel Buguña, David
    Journal of hazardous materials
    Vol. 180, num. 1-3, p. 693-702
    DOI: 10.1016/j.jhazmat.2010.04.093
    Date of publication: 2010-08-15
    Journal article

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    A comparative study based on physical characteristics of suitable packing materials in biofiltration  Open access

     Dorado Castaño, Antonio David; Lafuente, J; Gabriel Buguña, David; Gamisans Noguera, Javier
    Environmental technology
    Vol. 31, num. 2, p. 193-204
    DOI: 10.1080/09593330903426687
    Date of publication: 2010-02-02
    Journal article

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  • Aplicació de tècniques biotecnològiques a l'extracció de metalls presents en menes metàl·liques

     Dorado Castaño, Antonio David; Sole Sardans, M. Montserrat; Lao Luque, Concepcion; Bonsfills Pedros, Ana; Oliva Moncunill, Josep; Parcerisa Duocastella, David; Alfonso Abella, María Pura
    Competitive project

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