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    Biotrickling filters for biogas sweetening: Oxygen transfer improvement for a reliable operation  Open access

     Dorado Castaño, Antonio David; Rodriguez, Ginesta; Fortuny, Marc; Gabriel, David; Gamisans Noguera, Javier
    Process safety and environmental protection
    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.

    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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    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
    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.

    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.

  • Integració de la competència de la tercera llengua en els estudis de grau

     Alsina Aubach, Montserrat; Argelaguet Isanta, Maria Rosa; Bonet Dalmau, Jordi; de las Heras Cisa, F. Xavier; del Águila López, Francisco; Fortuny Santos, Jordi; Franch Parella, Jorge; Gamisans Noguera, Javier; Giralt Mas, M. Rosa; Lao Luque, Concepcion; Martinez Teixidor, Inmaculada; Palà Schönwälder, Pere; Parcerisa Duocastella, David; Vicente Rodrigo, Jesús; Lopez Martinez, Joan Antoni; Soler Lorente, Monica; Vila Marta, Sebastian
    Higher Education Perspectives on CLIL
    Presentation's date: 2014-03-28
    Presentation of work at congresses

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  • 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
    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
    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
    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.

  • Modeling and control strategies for anoxic biotrickling filtration

     Gamisans Noguera, Javier; Almengló, Fernando; Ramírez, Martín; Cantero, Domingo; Gómez, José Manuel; 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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  • Development of a novel microsensor for the study of oxygen profiles in biofilms

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

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

     Gamisans Noguera, Javier; Guimera Villalba, Xavier; Dorado Castaño, Antonio David; Gabriel, David
    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
    Defense's date: 2013-10-18
    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.

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

     Gamisans Noguera, Javier; Dorado Castaño, Antonio David
    Participation in a competitive project

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

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

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

     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
    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.

  • 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
    Presentation's date: 2013-02-08
    Presentation of work at congresses

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  • 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
    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, David
    International Conference on Biotechniques for Air Pollution Control and Bioenergy
    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.

  • Application of respirometry and titrimetry to characterize SO-NR mixed cultures obtained from anoxic biotrickling filters

     Mora, Mabel; Fernandez, Maikel; Gómez, José Manuel; Cantero, Domingo; Gamisans Noguera, Javier; Gabriel, David
    International Conference on Biotechniques for Air Pollution Control and Bioenergy
    Presentation's date: 2013-09-11
    Presentation of work at congresses

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    Monitoring of the biological activity in a desulfurizing biotrickling filter (BTF) is difficult since it implies esstimating biomass concetration and growth yield coefficients, which are parameters that can hardly be easured when using immobilitzed biomass. In this study, the characterization of a sulfide-oxidizing biomass obtained from an anoxic BTF was performed through the application of respirometric and titrimetric techniques.

  • 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
    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.

  • Operational aspects, pH transition and microbial shifts of a H2S desulfurizing biotrickling filter with random packing material

     Montebello, Andrea M.; Bezerra, Tercia; Rovira, Roger; Rago, Laura; Lafuente, Javier; Gamisans Noguera, Javier; Campoy, Susana; Baeza, Mireia; Gabriel, David
    Chemosphere
    Date of publication: 2013-10
    Journal article

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    Pall rings, a common random packing material, were used in the biotrickling filtration of biogas with high H2S. Assessment of 600 d of operation covered the reactor start-up, the operation at neutral pH and the transition from neutral to acid pH. During the start-up period, operational parameters such as the aeration rate and the trickling liquid velocity were optimized. During the steady-state operation at neutral pH, the performance of the random packing material was investigated by reducing the gas contact time at both constant and increasing H2S loads. The random packing material showed similar elimination capacities and removal efficiencies in comparison with previous studies with a structured packing material, indicating that Pall rings are suitable for biogas desulfurization in biotrickling filters. The diversity of Eubacteria and the structure of the community were investigated before and after the pH transition using the bacterial tag-encoded FLX amplicon pyrosequencing. The pH transition to acid pH drastically reduced the microbial diversity and produced a progressive specialization of the sulfur-oxidizing bacteria community without any detrimental effect on the overall desulfurizing capacity of the reactor. During acidic pH operation, a persistent accumulation of elemental sulfur was found.

  • Integració de la competència d'anglès en els graus  Open access

     Alsina Aubach, Montserrat; Argelaguet Isanta, Maria Rosa; Bonet Dalmau, Jordi; de las Heras Cisa, F. Xavier; del Águila López, Francisco; Fortuny Santos, Jordi; Franch Parella, Jorge; Gamisans Noguera, Javier; Giralt Mas, M. Rosa; Lao Luque, Concepcion; Lopez Martinez, Joan Antoni; Martínez Rovira, Immaculada; Palà Schönwälder, Pere; Parcerisa Duocastella, David; Soler Lorente, Monica; Vicente Rodrigo, Jesús; Vila Marta, Sebastian
    Jornada d'Innovació Docent UPC
    Presentation's date: 2013-02
    Presentation of work at congresses

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    La finalitat del projecte ha estat la integració de la competència de la tercera llengua en els estudis de grau, des del convenciment que ens cal formar professionals tecnològics multilingües, que és el que ens ha motivat a constituir el grup de recerca u-Linguatech, dins del marc del projecte Rima. L¿anàlisi del punt de partida de l¿estudiantat i el professorat ha permès fer una bona planificació de l¿oferta d¿assignatures impartides en anglès en els graus del centre. També ha estat la base per a l¿elaboració d¿estratègies i material per tal de garantir una millor qualitat en la docència. En particular, destaca el portal web Multilingual Formulae i el web del grup u-Linguatech, amb l¿objectiu de facilitar recursos a la comunitat universitària. La bona valoració rebuda en els congressos en que se n¿ha fet difusió avala els resultats obtinguts.

    La finalitat del projecte ha estat la integració de la competència de la tercera llengua en els estudis de grau, des del convenciment que ens cal formar professionals tecnològics multilingües, que és el que ens ha motivat a constituir el grup de recerca u-Linguatech, dins del marc del projecte Rima. L’anàlisi del punt de partida de l’estudiantat i el professorat ha permès fer una bona planificació de l’oferta d’assignatures impartides en anglès en els graus del centre. També ha estat la base per a l’elaboració d’estratègies i material per tal de garantir una millor qualitat en la docència. En particular, destaca el portal web Multilingual Formulae i el web del grup u-Linguatech, amb l’objectiu de facilitar recursos a la comunitat universitària. La bona valoració rebuda en els congressos en que se n’ha fet difusió avala els resultats obtinguts.

  • 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, David; Gabriel, Gemma
    International Conference on Biotechniques for Air Pollution Control and Bioenergy
    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.

  • 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, David; Gamisans Noguera, Javier
    Chemical engineering journal
    Date of publication: 2012
    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
    Date of publication: 2012
    Journal article

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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
    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).

    Postprint (author’s final draft)

  • 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, David; Gamisans Noguera, Javier
    Journal of chemical technology & biotechnology
    Date of publication: 2012-02-01
    Journal article

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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
    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.

    Postprint (author’s final draft)

  • Multilingual formulae: Material didàctic amb la verbalització de llenguatge simbòlic en català, castellà i anglès  Open access

     Alsina Aubach, Montserrat; Argelaguet Isanta, Maria Rosa; Bonet Dalmau, Jordi; del Águila López, Francisco; Fortuny Santos, Jordi; Gamisans Noguera, Javier; Giralt Mas, M. Rosa; Lao Luque, Concepcion; Martinez Teixidor, Inmaculada; Palà Schönwälder, Pere; Rossell Garriga, Josep Maria; Soler Lorente, Monica; Ventura Capell, Enric; Vila Marta, Sebastian
    Jornada d'Innovació Docent UPC
    Presentation's date: 2012
    Presentation of work at congresses

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  • 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, David
    Award or recognition

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  • Sorption of emergent contaminants by activated carbons: equilibrium and kinetics modelling

     Llado Valero, Jordi; Lao Luque, Concepcion; Sole Sardans, M. Montserrat; Gamisans Noguera, Javier; Ruiz, Begoña; Fuente, Enrique
    Reunión Ibérica de Adsorción
    Presentation's date: 2012-09-13
    Presentation of work at congresses

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    The challenge of plurilingual competence: analysis and teaching tools from the chemical engineering  Open access

     Alsina Aubach, Montserrat; de las Heras Cisa, F. Xavier; Lao Luque, Concepcion; Gamisans Noguera, Javier
    International Symposium on Innovation and Quality in Engineering Education
    Presentation's date: 2012-04-27
    Presentation of work at congresses

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    The European Institutions have the challenge and the commitment to enhance plurilingual competence, and teaching curricular subjects in a foreign language is seen as one of the most promising alternatives. However, teaching in a foreign language doesn¿t mean just to translate contents, when the quality of the specific subject wants to be guaranteed. Some arrangements are necessary in order to balance the achievement of both, specific and linguistic competences. In that context, professors teaching different engineering subjects at the Campus of Manresa (EPSEM) at the UPC have been involved in projects to analyze the current situation and develop some on-line open access materials, as Class-talk and Multilingual Formulae, giving rise to the group Linguatech-Rima (Research group on Scientific and Technologic Multilingual Communication). In this paper we focus on how to improve plurilingual competence throughout the new degrees, by teaching chemical subjects in English to non-native speakers. Data about the level in english of current professors are taken in account. We also describes the use of the above resources to improve the quality of learning in two subjects Chemistry and Instrumental Analytical Chemistry.

    The European Institutions have the challenge and the commitment to enhance plurilingual competence, and teaching curricular subjects in a foreign language is seen as one of the most promising alternatives. However, teaching in a foreign language doesn’t mean just to translate contents, when the quality of the specific subject wants to be guaranteed. Some arrangements are necessary in order to balance the achievement of both, specific and linguistic competences. In that context, professors teaching different engineering subjects at the Campus of Manresa (EPSEM) at the UPC have been involved in projects to analyze the current situation and develop some on-line open access materials, as Class-talk and Multilingual Formulae, giving rise to the group Linguatech-Rima (Research group on Scientific and Technologic Multilingual Communication). In this paper we focus on how to improve plurilingual competence throughout the new degrees, by teaching chemical subjects in English to non-native speakers. Data about the level in english of current professors are taken in account. We also describes the use of the above resources to improve the quality of learning in two subjects Chemistry and Instrumental Analytical Chemistry.

    Las instituciones europeas tienen el reto y el compromiso de mejorar la competencia plurilingüe, y la enseñanza de materias curriculares en una lengua extranjera es vista como una de las alternativas más prometedoras para conseguirlo. Sin embargo, si se quiere garantizar la calidad de la materia específica impartida, no se trata simplemente de traducir el contenido. Deben realizarse modificaciones adicionales a fin de equilibrar la consecución de ambas, las competencias específicas y las lingüísticas. En ese contexto, profesores de diferentes materias de ingeniería en el Campus de Manresa (EPSEM) de la UPC se han implicado en proyectos de análisis de la situación actual, y desarrollo de materiales accesibles en la red, como el Class-Talk y el Multilingual Formulae, dando lugar al grupo Linguatech-Rima (grupo de investigación en comunicación científica y tecnológica multilingüe). En este artículo nos centramos en cómo mejorar la competencia plurilingüe a través de las nuevas titulaciones, con la impartición de materias de química en inglés, para hablantes no nativos. Para la planificación se han tenido en cuenta datos sobre el nivel de inglés del profesorado actual. Se describe también el uso de los recursos anteriores para mejorar la calidad del aprendizaje, desde las asignaturas de Química y Química analítica instrumental.

  • 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
    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
    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
    Presentation's date: 2012-01-27
    Presentation of work at congresses

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  • Operational aspects of the desulfurization process of energy gases mimics in biotrickling filters

     Fortuny, Marc; Gamisans Noguera, Javier; Deshusses, Marc A.; Lafuente, Javier; Casas ., Carles; Gabriel, David
    Water research (Oxford)
    Date of publication: 2011-11-01
    Journal article

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

     Gabriel, 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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  • Simultaneous removal of H2S, NH3 and ethylmercaptan in biotrickling filters

     Gamisans Noguera, Javier
    Water & Industry: IWA Specialist Conference Chemical Industries
    Presentation's date: 2011-05-03
    Presentation of work at congresses

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  • A Closer look at dissolved oxygen in biofilms and its effect on pollutant biodegradation in biotrickling filters

     Gamisans Noguera, Javier
    International Conference on Biotechniques for Air Pollution Control
    Presentation's date: 2011-10-13
    Presentation of work at congresses

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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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  • On és la química? (2011)

     Grau Vilalta, Maria Dolors; Bonsfills Pedros, Ana; Casas Sabata, Jose Maria; Gamisans Noguera, Javier; Gorchs Altarriba, Roser; Sole Sardans, M. Montserrat
    Collaboration in exhibitions

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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, David
    Mediterranean Congress of Chemical Engineering
    Presentation's date: 2011-11-17
    Presentation of work at congresses

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  • Kinetic parameters determination of a SO-NR microbial population by respirometric tests

     Mora, Mabel; Guisáosla, Albert; Lafuente, Javier; Gamisans Noguera, Javier; Gabriel, David
    International Conference on Biotechniques for Air Pollution Control
    Presentation's date: 2011-10-12
    Presentation of work at congresses

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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, David
    Mediterranean Congress of Chemical Engineering
    Presentation's date: 2011-11-18
    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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  • 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
    Presentation's date: 2011-10-17
    Presentation of work at congresses

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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, David
    International Conference on Biotechniques for Air Pollution Control
    Presentation's date: 2011-10-12
    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, David
    Journal of hazardous materials
    Date of publication: 2010-08-15
    Journal article

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  • Bacterial community analysis of a gas-phase biotrickling filter for biogas mimics desulfurization through the rRNA approach

     Maestre, Juan P.; Rovira, Rosario; Alvarez Hornos, F. J.; Fortuny, M; Lafuente, J; Gamisans Noguera, Javier; Gabriel, David
    Chemosphere
    Date of publication: 2010-08
    Journal article

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