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  • Technical, economic and environmental assessment of household biogas digesters for rural communities

     Pérez Bort, Irene; Garfi, Marianna; Cadena, Erasmo; Ferrer Martí, Ivet
    Renewable energy
    Vol. 62, p. 313-318
    DOI: 10.1016/j.renene.2013.07.017
    Date of publication: 2014-02
    Journal article

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    This study was carried out in response to the growing interest on household biogas digesters in Latin America, particularly in rural Andean communities. The aim was to compare the fixed dome and plastic tubular digester in terms of biogas production, cost and environmental impact, using the life cycle assessment methodology. Design and operational parameters, construction materials and implementation costs were based on our previous research and literature results for plastic tubular and fixed dome digesters, respectively. According to this analysis, the main advantage of the plastic tubular digester was its ease of implementation and handling, and lower investment cost compared to the fixed dome digester, which appeared to be more environmentally friendly. © 2013 Elsevier Ltd.

    This study was carried out in response to the growing interest on household biogas digesters in Latin America, particularly in rural Andean communities. The aim was to compare the fixed dome and plastic tubular digester in terms of biogas production, cost and environmental impact, using the life cycle assessment methodology. Design and operational parameters, construction materials and implementation costs were based on our previous research and literature results for plastic tubular and fixed dome digesters, respectively. According to this analysis, the main advantage of the plastic tubular digester was its ease of implementation and handling, and lower investment cost compared to the fixed dome digester, which appeared to be more environmentally friendly.

  • Long-term anaerobic digestion of microalgae grown in HRAP for wastewater treatment. Effect of microwave pretreatment

     Lopes del Rei Passos, Fabiana; Hernandez Marine, Mariona; Garcia Serrano, Joan; Ferrer Martí, Ivet
    Water research (Oxford)
    Vol. 49, p. 351-359
    DOI: 10.1016/j.watres.2013.10.013
    Date of publication: 2014-02-01
    Journal article

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    This paper describes the anaerobic digestion of microalgal biomass from high rate ponds in continuous anaerobic reactors for biogas production. With hydraulic retention times (HRT) of 15 and 20 days, the volatile solids (VS) removal did not exceed 30%, and the methane production rate ranged between 0.12 and 0.14 L CH4/L day. To improve process performance, microwave irradiation at 900 W for 3 min (specific energy similar to 70,000 kJ/kg VS) was applied as a pretreatment step. The VS removal increased to 40 and 45% at 15 and 20 days HRT, respectively. Consequently, the methane production rate increased to 0.16 and 0.20 L CH4/L day at 15 and 20 days HRT, respectively. Microscopic analysis confirmed cell wall damage, although generally without lysis, after irradiating microalgal biomass. However, the energy consumption was much higher than the extra energy production of the process. Indeed, microalgal biomass should not only be thickened but also dewatered if microwave irradiation was to be applied as a pretreatment to anaerobic digestion for biogas production. (C) 2013 Elsevier Ltd. All rights reserved.

  • Grup d'enginyeria i microbiologia del medi ambient

     Ferrer Martí, Ivet; Puigagut Juarez, Jaume; Garfi, Marianna; Uggetti, Enrica; Avila Martin, Cristina; Carretero Ariza, Javier; Alvarez San Millan, Eduardo; Samso Campa, Roger; Lopes del Rei Passos, Fabiana; Gutierrez Martinez, Raquel; Solimeno, Alessandro; Corbella Vidal, Clara; Rodríguez, Frisso; Garcia Serrano, Joan
    Competitive project

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  • Ecotechnologies for water treatment and recovery of resources

     Ferrer Martí, Ivet; Puigagut Juarez, Jaume; Garfi, Marianna; Uggetti, Enrica; Garcia Serrano, Joan
    Competitive project

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  • Effect of substrate and cation requirement on anaerobic volatile fatty acid conversion rates at elevated biogas pressure

     Lindeboom, Ralph E.F.; Ferrer Martí, Ivet; Weijma, Jan; van Lier, Jules B.
    Bioresource technology
    Vol. 150, p. 60-66
    DOI: 10.1016/j.biortech.2013.09.100
    Date of publication: 2013-12-01
    Journal article

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    This work studied the anaerobic conversion of neutralized volatile fatty acids (VFA) into biogas under Autogenerative High Pressure Digestion (AHPD) conditions. The effects of the operating conditions on the biogas quality, and the substrate utilisation rates were evaluated using 3 AHPD reactors (0.6 L); feeding a concentration of acetate and VFA (1-10 g COD/L) corresponding to an expected pressure increase of 1-20 bar. The biogas composition improved with pressure up to 4.5 bar (>93% CH4), and stabilized at 10 and 20 bar. Both, acetotrophic and hydrogenotrophic methanogenic activity was observed. Substrate utilisation rates of 0.2, 0.1 and 0.1 g CODCH4/g VSS/d for acetate, propionate and butyrate were found to decrease by up to 50% with increasing final pressure. Most likely increased Na+-requirement to achieve CO2 sequestration at higher pressure rather than end-product inhibition was responsible. (C) 2013 Elsevier Ltd. All rights reserved.

  • Impact of low temperature pretreatment on the anaerobic digestion of microalgal biomass

     Lopes del Rei Passos, Fabiana; Garcia Serrano, Joan; Ferrer Martí, Ivet
    Bioresource technology
    Vol. 138, p. 79-86
    DOI: 10.1016/j.biortech.2013.03.114
    Date of publication: 2013-06
    Journal article

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    The aim of this study was to investigate the effect of low temperature pretreatment on the anaerobic digestion of microalgal biomass grown in wastewater. To this end, microalgae were pretreated at low temperatures (55, 75 and 95. C) for 5, 10 and 15. h. Biomass solubilisation was enhanced with the pretreatment temperature and exposure time up to 10. h. The methane yield was improved by 14%, 53% and 62% at 55, 75 and 95. C, respectively; and was correlated with the solubilisation increase. The pretreatment at 95. C for 10. h increased VS solubilisation by 1188%, the initial methane production rate by 90% and final methane yield by 60% compared to untreated microalgae. With diluted biomass (~1% VS) positive energy balance was not likely to be attained. However, with concentrated biomass (2% VS) energy requirements may be covered and even surplus energy generated.

    The aim of this study was to investigate the effect of low temperature pretreatment on the anaerobic digestion of microalgal biomass grown in wastewater. To this end, microalgae were pretreated at low temperatures (55, 75 and 95 °C) for 5, 10 and 15 h. Biomass solubilisation was enhanced with the pretreatment temperature and exposure time up to 10 h. The methane yield was improved by 14%, 53% and 62% at 55, 75 and 95 °C, respectively; and was correlated with the solubilisation increase. The pretreatment at 95 °C for 10 h increased VS solubilisation by 1188%, the initial methane production rate by 90% and final methane yield by 60% compared to untreated microalgae. With diluted biomass (∼1% VS) positive energy balance was not likely to be attained. However, with concentrated biomass (>2% VS) energy requirements may be covered and even surplus energy generated.

  • Biogas production from microalgae grown in wastewater: effect of microwave pretreatment

     Lopes del Rei Passos, Fabiana; Sole, Maria; Garcia Serrano, Joan; Ferrer Martí, Ivet
    Applied energy
    Vol. 108, p. 168-175
    DOI: 10.1016/j.apenergy.2013.02.042
    Date of publication: 2013-08
    Journal article

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    The aim of this study was to evaluate the effect of microwave pretreatment on the solubilisation and anaerobic digestion of microalgae-bacterial biomass cultivated in high rate algal ponds for wastewater treatment. The microwave pretreatment comprised three specific energies (21,800, 43,600 and 65,400. kJ/kg TS), combining three output power values with different exposure times. Response surface analysis showed that the main parameter influencing biomass solubilisation was the applied specific energy. Indeed, a similar solubilisation increase was obtained for the same specific energy, regardless of the output power and exposure time (280-350% for 21,800. kJ/kg TS, 580-610% for 43,600. kJ/kg TS and 730-800% for 65,400. kJ/kg TS). In biochemical methane potential tests, the initial biogas production rate (27-75% increase) and final biogas yield (12-78% increase) were higher with pretreated biomass. A linear correlation was found between biomass solubilisation and biogas yield.

  • Silicate minerals for CO2 scavenging from biogas in Autogenerative High Pressure Digestion

     Lindeboom, Ralph E.F.; Ferrer Martí, Ivet; Weijma, Jan; van Lier, Jules B.
    Water research (Oxford)
    Vol. 47, num. 11, p. 3742-3751
    DOI: 10.1016/j.watres.2013.04.028
    Date of publication: 2013-07
    Journal article

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  • Q-00205

     Ferrer Martí, Ivet
    Competitive project

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  • Technical, economic and environmental assessment of household biogas digesters in developing countries

     Ferrer Martí, Ivet; Cadena, Erasmo; Pérez Bort, Irene; Garfi, Marianna
    World Congress on Anaerobic Digestion
    p. 1-5
    Presentation's date: 2013-06-26
    Presentation of work at congresses

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    This study was carried out in response to the growing interest on household biogas digesters in Latin America, particularly in rural Andean communities. The aim was to compare traditional and novel digester designs, in terms of biogas production, cost and environmental impact. Three household digesters were compared: 1) fixed dome ¿ Chinese model; 2) fixed dome ¿ Camartec model and 3) plastic tubular ¿ Taiwanese model. Data concerning design and operational parameters, construction materials and costs were obtained from our previous results on plastic tubular digesters and from the literature on fixed dome digesters. The biogas production rate ranged around 0.07-0.5 m3 biogas m-3 digester d-1 in plastic tubular digesters and around 0.35-0.7 m3 biogas m-3 digester d-1 in fixed dome digesters. The novel design of the Camartec model reduced construction materials and capital cost by 27 % compared to the Chinese model. The cost of plastic tubular digesters was mainly attributed to the geomembrane. The life cycle assessment showed how the Camartec model caused the lowest impact, while the plastic tubular digester had the highest impact; which was mainly attributed to plastic materials (greenhouse and biogas reservoir) and geomembrane (digester). In the Chinese model, the main impact was caused by concrete and bricks, which were respectively 38 and 22 % higher than in the Camartec system. The highest impact of the tubular digester may be explained by the lifespan of construction materials. From an economic and environmental perspective, the Camartec model seems the best option; the main advantage of plastic tubular digesters being its ease of implementation and handling.

    This study was carried out in response to the growing interest on household biogas digesters in Latin America, particularly in rural Andean communities. The aim was to compare traditional and novel digester designs, in terms of biogas production, cost and environmental impact. Three household digesters were compared: 1) fixed dome – Chinese model; 2) fixed dome – Camartec model and 3) plastic tubular – Taiwanese model. Data concerning design and operational parameters, construction materials and costs were obtained from our previous results on plastic tubular digesters and from the literature on fixed dome digesters. The biogas production rate ranged around 0.07-0.5 m3 biogas m-3 digester d-1 in plastic tubular digesters and around 0.35-0.7 m3 biogas m-3 digester d-1 in fixed dome digesters. The novel design of the Camartec model reduced construction materials and capital cost by 27 % compared to the Chinese model. The cost of plastic tubular digesters was mainly attributed to the geomembrane. The life cycle assessment showed how the Camartec model caused the lowest impact, while the plastic tubular digester had the highest impact; which was mainly attributed to plastic materials (greenhouse and biogas reservoir) and geomembrane (digester). In the Chinese model, the main impact was caused by concrete and bricks, which were respectively 38 and 22 % higher than in the Camartec system. The highest impact of the tubular digester may be explained by the lifespan of construction materials. From an economic and environmental perspective, the Camartec model seems the best option; the main advantage of plastic tubular digesters being its ease of implementation and handling.

  • Comparing pretreatment methods to improve the methane yield of microalgae grown in wastewater

     Lopes del Rei Passos, Fabiana; Ferrer Martí, Ivet
    World Congress on Anaerobic Digestion
    p. 1-5
    Presentation's date: 2013-06-26
    Presentation of work at congresses

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    Microalgae have recently drawn attention as a potential resource for biofuels generation. In the short term, anaerobic digestion seems the most viable downstream process. Still, microalgae cell wall restrains the hydrolysis, hampering the methane production potential. This work aimed at improving the anaerobic biodegradability of microalgae through different pretreatment methods: microwave, low temperature and high temperature. For the microwave pretreatment, the specific energy was the main parameter affecting biomass solubilisation, increasing up to 800 % compared to untreated biomass. For the low and high temperature pretreatments, temperature was the most important factor, increasing biomass solubilisation up to 1190 and 2140 % in each case. BMP tests showed an increased methane yield after all pretreatments (40-80 %), with the highest results for the microwave pretreatment. In semi-continuous reactors operated at 15 days HRT, the methane production was increased by 30 and 33 % after microwave and low temperature pretreatment, respectively. When increasing the HRT to 20 days, the methane yield was further enhanced by 60 and 52 % after microwave and low temperature pretreatment, respectively. Therefore, initial results showed pretreatment potential for microalgae solubilisation and methane yield improvement.

    Microalgae have recently drawn attention as a potential resource for biofuels generation. In the short term, anaerobic digestion seems the most viable downstream process. Still, microalgae cell wall restrains the hydrolysis, hampering the methane production potential. This work aimed at improving the anaerobic biodegradability of microalgae through different pretreatment methods: microwave, low temperature and high temperature. For the microwave pretreatment, the specific energy was the main parameter affecting biomass solubilisation, increasing up to 800 % compared to untreated biomass. For the low and high temperature pretreatments, temperature was the most important factor, increasing biomass solubilisation up to 1190 and 2140 % in each case. BMP tests showed an increased methane yield after all pretreatments (40-80 %), with the highest results for the microwave pretreatment. In semi-continuous reactors operated at 15 days HRT, the methane production was increased by 30 and 33 % after microwave and low temperature pretreatment, respectively. When increasing the HRT to 20 days, the methane yield was further enhanced by 60 and 52 % after microwave and low temperature pretreatment, respectively. Therefore, initial results showed pretreatment potential for microalgae solubilisation and methane yield improvement.

  • Evaluating benefits of low-cost household digesters for rural Andean communities

     Garfi, Marianna; Ferrer Marti, Laia; Velo Garcia, Enrique; Ferrer Martí, Ivet
    Renewable and sustainable energy reviews
    Vol. 16, num. 10, p. 575-581
    DOI: 10.1016/j.rser.2011.08.023
    Date of publication: 2012-01
    Journal article

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  • Dewatering model for optimal operation of sludge treatment wetlands

     Uggetti, Enrica; Argilaga, A.; Ferrer Martí, Ivet; Garcia Serrano, Joan
    Water research (Oxford)
    Vol. 46, num. 2, p. 335-344
    DOI: 10.1016/j.watres.2011.10.040
    Date of publication: 2012-02-01
    Journal article

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  • Quantification of greenhouse gas emissions from sludge treatment wetlands

     Uggetti, Enrica; Garcia Serrano, Joan; Lind, S.E.; Martikainen, P.J.; Ferrer Martí, Ivet
    Water research (Oxford)
    Vol. 46, num. 6, p. 1755-1762
    DOI: 10.1016/j.watres.2011.12.049
    Date of publication: 2012-04-15
    Journal article

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  • Characteristics of biosolids from sludge treatment wetlands for agricultural reuse

     Uggetti, Enrica; Ferrer Martí, Ivet; Nielsen, Steen; Arias Isaza, Carlos Alberto de Jesus; Brix, Hans; Garcia Serrano, Joan
    Ecological engineering
    Vol. 40, p. 210-216
    DOI: 10.1016/j.ecoleng.2011.12.030
    Date of publication: 2012-03
    Journal article

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  • Performance of sludge treatment wetlands using different plant species and porous media

     Uggetti, Enrica; Ferrer Martí, Ivet; Carretero Ariza, Javier; Garcia Serrano, Joan
    Journal of hazardous materials
    Vol. 217-218, p. 263-270
    DOI: 10.1016/j.jhazmat.2012.03.027
    Date of publication: 2012-05-30
    Journal article

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  • Carbon footprint of sludge treatment reed beds

     Uggetti, Enrica; Ferrer Martí, Ivet; Arias Isaza, Carlos Alberto de Jesus; Brix, Hans; Garcia Serrano, Joan
    Ecological engineering
    Vol. 44, p. 298-302
    DOI: 10.1016/j.ecoleng.2012.04.020
    Date of publication: 2012-07
    Journal article

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  • Biogas production from microalgae grown in wastewater: effect of microwave pretreatment

     Lopes del Rei Passos, Fabiana; Garcia Serrano, Joan; Ferrer Martí, Ivet
    Young Algaeneers Symposium
    p. 74
    Presentation's date: 2012-06-14
    Presentation of work at congresses

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  • Microalgae production and wastewater treatment in high rate algal ponds and low-cost tubular photobioreactors

     Lopes del Rei Passos, Fabiana; Garcia Serrano, Joan; Ferrer Martí, Ivet
    Young Algaeneers Symposium
    p. 24
    Presentation's date: 2012-06-15
    Presentation of work at congresses

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  • Producción de biogás a partir de microalgas cultivadas en aguas residuales

     Ferrer Martí, Ivet; Lopes del Rei Passos, Fabiana; Garcia Serrano, Joan
    Reunión de la Mesa Española de Tratamiento de Aguas
    p. 151-152
    Presentation's date: 2012-10-05
    Presentation of work at congresses

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  • Biogas production in low-cost household digesters at the Peruvian Andes

     Ferrer Martí, Ivet; Uggetti, Enrica; Ferrer Marti, Laia; Calderón, Arcadio; Velo Garcia, Enrique; Garfi, Marianna
    Biomass and bioenergy
    Vol. 35, num. 5, p. 1668-1674
    DOI: 10.1016/j.biombioe.2010.12.036
    Date of publication: 2011-05
    Journal article

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  • Codigestion of cow and guinea pig manure in low-cost tubular digesters at high altitude

     Garfi, Marianna; Ferrer Marti, Laia; Pérez Bort, Irene; Flotats Ripoll, Xavier; Ferrer Martí, Ivet
    Ecological engineering
    Vol. 37, num. 12, p. 2066-2070
    DOI: 10.1016/j.ecoleng.2011.08.018
    Date of publication: 2011-12
    Journal article

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  • Comparison of the mesophilic and thermophilic anaerobic sludge digestion from an energy perspective

     Ferrer Martí, Ivet; Vázquez, Felícitas; Font, Xavier
    Journal of residuals science and technology
    Vol. 8, num. 2, p. 81-87
    Date of publication: 2011-04
    Journal article

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  • Life Cycle Assessment of an intensive sewage treatment plant in Barcelona (Spain) with focus on energy aspects

     Bravo Hidalgo, Lola; Ferrer Martí, Ivet
    Water science and technology
    Vol. 64, num. 2, p. 440-447
    DOI: 10.2166/wst.2011.522
    Date of publication: 2011
    Journal article

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  • Psychrophilic anaerobic digestion of guinea pig manure in low-cost tubular digesters at high altitude

     Garfi, Marianna; Ferrer Marti, Laia; Villegas, V.; Ferrer Martí, Ivet
    Bioresource technology
    Vol. 102, num. 10, p. 6356-6359
    DOI: 10.1016/j.biortech.2011.03.004
    Date of publication: 2011-05
    Journal article

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  • Bioalgas: producción de biogas a partir de biomasa algal procedente de lagunas de alta carga para la depuración de aguas residuales

     Lopes del Rei Passos, Fabiana; Uggetti, Enrica; Gullon Santos, Martin; Ferrer Martí, Ivet
    Competitive project

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  • SEWAGE SLUDGE TREATMENT IN CONSTRUCTED WETLANDS. Technical, economic and environmental aspects applied to small communities of the Mediterranean Region.  Open access  awarded activity

     Uggetti, Enrica
    Universitat Politècnica de Catalunya
    Theses

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    During the last years, the implementation of new Wastewater Treatment Plants has lead to a significant increase of sludge production. As a response, sludge valorisation in agriculture is the preferred option nowadays, ensuring the return of organic constituents, nutrients and microelements to crop fields. In practice, sludge treatments should provide a final product suitable for land application, with reasonable investment as well as operational and maintenance costs. In this sense, sludge treatment wetlands (STW) appear as a suitable technology for sludge management from an economic and environmental point of view. The main objective of this research work was to assess the suitability of STW for sludge management; with special focus on small communities of the Mediterranean Region. To this end, technical, environmental and economic aspects of the treatment were studied in 3 full-scale systems and in a pilot plant located in Catalonia. A comparison with conventional treatments for sludge management is presented in order to establish the most favourable solution for the Catalan context. As the final result from this work, design and operation criteria are proposed as a guide for STW implementation in small Mediterranean communities. The study of the performance of the full-scale STW suggests good treatment efficiency. Moisture content was reduced by 16-30%, reaching efficiencies similar to those of conventional dewatering technologies. On the other hand, VS were reduced up to 30-49%VS/TS, suggesting the progressive sludge stabilisation and mineralisation. Similar values were found at the end of the treatment in the pilot plant. In this case the sludge volume was reduced around 80% and TS increased up to 16-24%. However, the observed VS reduction (up to 50%VS/TS) after 2 months without feeding, indicates that longer resting periods should be applied in order to increase mineralisation of the sludge. A finite element model able to simulate sludge dewatering in STW was developed by combining the evapotranspiration (ET) and the Terzaghi¿s consolidation theory representing water percolation. The model allows for the determination of the most appropriate feeding frequency as a function of the sludge height stored on the wetland. Similarly, the sludge loading rate is determined as a function of ET, feeding frequency and sludge height. On the whole, the model implemented is a useful tool for the establishment of standardised criteria of STW operation. The characterisation of the final product from the pilot plant and from three full-scale systems demonstrated the suitability of biosolids as organic fertilisers. DRI values indicated the partial stabilisation of the product. Moreover, the absence of phytotoxicity and the heavy metals concentrations below the legal thresholds confirmed their viability to be reused in agriculture. However, in the pilot plant, pathogens were still present after 2 resting months, confirming the necessity of a longer resting period. Monitoring the stabilisation degree as phytotoxicity, heavy metals and pathogens' concentration during the final resting period would help optimising its duration. Looking at the environmental aspects, the static chamber method was successfully adapted to the determination of gas emissions from STW. Aerobic conditions before sludge feeding, characterised by low methane emissions and high nitrous oxide emissions, were strongly altered by fresh sludge feeding, which increases CH4 emissions and reduces N2O emissions. According to the measured emissions, the Global warming potential of STW corresponds to 17kgCO2eq/PE¿y, which is from 2 to 9 times lower than that of sludge centrifugation and transport. Besides,the economic and environmental assessment indicates STW with direct land application as the most cost-effective technique, which is also characterised by the lowest environmental impact.Thus STW are the best solution to manage waste sludge in decentralised small communities.

  • Technical, economic and environmental assessment of sludge treatment wetlands

     Uggetti, Enrica; Ferrer Martí, Ivet; Molist, Jordi; Garcia Serrano, Joan
    Water research (Oxford)
    Vol. 45, num. 2, p. 573-582
    DOI: 10.1016/j.watres.2010.09.019
    Date of publication: 2011-01
    Journal article

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    Sludge treatment wetlands (STW) emerge as a promising sustainable technology with low energy requirements and operational costs. In this study, technical, economic and environmental aspects of STW are investigated and compared with other alternatives for sludge management in small communities (<2000 population equivalent). The performance of fullscale STW was characterised during 2 years. Sludge dewatering increased total solids (TS) concentration by 25%, while sludge biodegradation lead to volatile solids around 45% TS and DRI24h between 1.1 and 1.4 gO2/kgTS h, suggesting a partial stabilisation of biosolids. In the economic and environmental assessment, four scenarios were considered for comparison: 1) STW with direct land application of biosolids, 2) STW with compost post-treatment, 3) centrifuge with compost post-treatment and 4) sludge transport to an intensive wastewater treatment plant. According to the results, STW with direct land application is the most cost-effective scenario, which is also characterised by the lowest environmental impact. The life cycle assessment highlights that global warming is a significant impact category in all scenarios, which is attributed to fossil fuel and electricity consumption; while greenhouse gas emissions from STW are insignificant. As a conclusion, STW are the most appropriate alternative for decentralised sludge management in small communities.

  • Agricultural reuse of the digestate from low-cost tubular digesters in rural Andean communities

     Garfi, Marianna; Gelman, Pau; Comas Angelet, Jordi; Carrasco, W.; Ferrer Martí, Ivet
    Waste management
    Vol. 31, num. 12, p. 2584-2589
    DOI: 10.1016/j.wasman.2011.08.007
    Date of publication: 2011-12
    Journal article

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  • Biogas production in low-cost household digesters at high altitude

     Garfi, Marianna; Ferrer Marti, Laia; Velo Garcia, Enrique; Ferrer Martí, Ivet
    Micro Perspectives for Decentralized Energy Supply
    p. 37
    Presentation's date: 2011-04
    Presentation of work at congresses

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  • Water science and technology

     Ferrer Martí, Ivet
    Collaboration in journals

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    Programa d¿investigació aplicada per a l¿impuls del desenvolupament energètic rural en Països en Desenvolupament ¿ PRIADER  Open access

     Velo Garcia, Enrique; Ferrer Marti, Laia; Ferrer Martí, Ivet; Batet Miracle, Lluis; Clos Costa, Daniel; Gomis Bellmunt, Oriol
    Date: 2010-03
    Report

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    Informe final de la convocatòria de subvencions destinades a donar suport a projectes de sensibilització, educació, formació, capacitació i recerca en l’àmbit de cooperació al desenvolupament impulsats per determinats agents universitaris dins l’exercici 2008 (codi de convocatòria U2008)

  • Tratamiento de lodos de depuradora con humedales artificiales

     Uggetti, Enrica; Ferrer Martí, Ivet; Castellnou, Roger; Molist, Jordi; Garcia Serrano, Joan
    Infoenviro : actualidad y tecnología de la industria medioambiental
    Vol. 56, p. 68-71
    Date of publication: 2010-07-01
    Journal article

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    Hoy en día la gestión del lodo de depuradora es un tema clave dentro del tratamiento del agua residual, representando hasta el 60% de los costes de operación de una depuradora urbana. El elevado contenido de agua del lodo encarece su gestión, justificando la necesidad de desarrollar métodos simples y económicos para reducir su volumen. Durante las últimas décadas, se ha adaptado la tecnología de los humedales construidos o lechos de macrófitos a la deshidratación del lodo. Como principales ventajas destacan una demanda energética, costes de operación y mantenimiento reducidos, y una buena integración en el paisaje. Sin embargo, el número de plantas en operación actualmente es muy reducido en comparación con los tratamientos mecánicos convencionales. En este artículo se describen las principales características y aspectos operacionales de los humedales construidos para el tratamiento del lodo, resumiendo los resultados más relevantes de la literatura.

    Postprint (author’s final draft)

  • Sludge treatment wetlands: a review on the state of the art

     Uggetti, Enrica; Ferrer Martí, Ivet; Llorens Ribes, Esther; Garcia Serrano, Joan
    Bioresource technology
    Vol. 101, num. 9, p. 2905-2912
    DOI: 10.1016/j.biortech.2009.11.102
    Date of publication: 2010-05
    Journal article

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    Sludge management has become a key issue in wastewater treatment, representing some 20–60% of the operational costs of conventional wastewater treatment plants. The high water content of the sludge results in large daily flow rates to be handled and treated. Thus, the search for methods to improve sludge volume reduction continues to be of major interest. The technology known as sludge treatment wetlands has been used for sludge dewatering since the late 1980s. Major advantages include its low energy requirements, reduced operating and maintenance costs, and a reasonable integration in the environment. However, the number of plants in operation is still low in comparison with conventional technologies. This study represents a review of the state of the art of sludge treatment wetlands. The main characteristics and operational aspects of the technology are described, including a summary of the main results reported in the literature. Finally, the efficiency of sludge treatment wetlands versus conventional treatments is compared.

  • Long term operation of a thermophilic anaerobic reactor: Process stability and efficiency at decreasing sludge retention time

     Ferrer Martí, Ivet; Vázquez, Felícitas; Font, Xavier
    Bioresource technology
    Vol. 101, num. 9, p. 2972-2980
    DOI: 10.1016/j.biortech.2009.12.006
    Date of publication: 2010-05
    Journal article

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  • Mesophilic and thermophilic anaerobic biodegradability of water hyacinth pre-treated at 80 °C

     Ferrer Martí, Ivet; Campos Pozuelo, Elena; Flotats Ripoll, Xavier; Palatsi Civit, Jordi
    Waste management
    Vol. 30, num. 10, p. 1763-1767
    DOI: 10.1016/j.wasman.2009.09.020
    Date of publication: 2010-10
    Journal article

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    Water hyacinth (Eichornia crassipes) is a fast growing aquatic plant which causes environmental problems in continental water bodies. Harvesting and handling this plant becomes an issue, and focus has been put on the research of treatment alternatives. Amongst others, energy production through biomethanation has been proposed. The aim of this study was to assess the anaerobic biodegradability of water hyacinth under mesophilic and thermophilic conditions. The effect of a thermal sludge pre-treatment at 80 C was also evaluated. To this end, anaerobic biodegradability tests were carried out at 35 C and 55 C, with raw and pre-treated water hyacinth. According to the results, the thermal pre-treatment enhanced the solubilisation of water hyacinth (i.e. increase in the soluble to total chemical oxygen demand (COD)) from 4% to 12% after 30 min. However, no significant effect was observed on the methane yields (150–190 L CH4/kg volatile solids). Initial methane production rates for thermophilic treatments were two fold those of mesophilic ones (6–6.5 L vs. 3–3.5 L CH4/kg COD day). Thus, higher methane production rates might be expected from thermophilic reactors working at short retention times. The study of longer low temperature pre-treatments or pre-treatments at elevated temperatures coupled to thermophilic reactors should be considered in the future.

  • Pretreatment methods to improve sludge anaerobic degradability: a review

     Carrère, H.; Dumas, C.; Battimelli, A.; Batstone, D.J.; Delgenès, J. P.; Steyer, J. P.; Ferrer Martí, Ivet
    Journal of hazardous materials
    Vol. 183, num. 1-3, p. 1-15
    DOI: 10.1016/j.jhazmat.2010.06.129
    Date of publication: 2010-11
    Journal article

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  • Properties of biosolids from sludge treatment wetlands for land application

     Uggetti, Enrica; Ferrer Martí, Ivet; Llorens, Esther; Güell, David; Garcia Serrano, Joan
    Date of publication: 2010-07-01
    Book chapter

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  • Ecological engineering

     Ferrer Martí, Ivet
    Collaboration in journals

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  • Chemosphere

     Ferrer Martí, Ivet
    Collaboration in journals

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  • Bioresource technology

     Ferrer Martí, Ivet
    Collaboration in journals

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  • Access to the full text
    Adaptación de biodigestores tubulares de plástico a climas fríos  Open access

     Poggio, Davide; Ferrer Martí, Ivet; Batet Miracle, Lluis; Velo Garcia, Enrique
    Livestock research for rural development
    Vol. 21, num. 9, p. 1-14
    Date of publication: 2009
    Journal article

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    Farmers in the Andean Plateau strongly demand for household biodigesters due to the lack of clean fuels and agricultural fertilizers, and the abundance of livestock residues. The diffusion of rural biodigesters in cold climate or mountainous rural zones has been traditionally scarce. The unfavorable relationship between low temperatures and the kinetics of biogas production poses a technological barrier to the implementation of low cost biodigesters. Since 2006, the Research Group on Development Cooperation and Human Development (GRECDH) from the Technical University of Catalonia (UPC), in collaboration with the Peruvian NGO Institute for an Alternative Agriculture (IAA), investigates on the development of household biodigesters adapted to extreme conditions of the Andean Plateau (3000-4500 m). This article describes the research project and its main findings.

  • The Role of natural wastewater treatment systems in the protection of water resources

     Llorens Ribes, Esther; Ferrer Martí, Ivet; Garcia Serrano, Joan
    Date of publication: 2009-08
    Book chapter

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  • Tratamiento de lodos de depuradora con lechos de macrófitos acuáticos

     Uggetti, Enrica; Llorens Ribes, Esther; Pedescoll Albacar, Anna; Ferrer Martí, Ivet; Garcia Serrano, Joan; Castellnou, R
    Date of publication: 2009-08
    Book chapter

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  • Sludge drying reed beds: a case study

     Uggetti, Enrica; Llorens Ribes, Esther; Pedescoll Albacar, Anna; Ferrer Martí, Ivet; Castellnou, R; Garcia Serrano, Joan
    Journal of residuals science and technology
    Vol. 6, num. 1, p. 57-59
    Date of publication: 2009-01
    Journal article

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  • Start-up strategies of thermophilic anaerobic digestion of sewage sludge

     Gimenez-Lorang, Antonio; Ferrer Martí, Ivet; Flotats Ripoll, Xavier; Palatsi Civit, Jordi
    Water science and technology
    Vol. 59, num. 9, p. 1777-1784
    DOI: 10.2166/wst.2009.180
    Date of publication: 2009-04
    Journal article

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    The aim of the present work was to evaluate two different strategies to convert a continuous mesophilic anaerobic reactor into thermophilic, treating sewage sludge. The compared strategies were a single direct temperature change, from 358 to 558C, and a multi-step temperature change (358–438–508–558C). The single direct step strategy was shown to be as effective as the more conservative multi-step strategy, recovering the system efficiency after 20 days in terms of methane yield, although there was a higher volatile fatty acids accumulation and higher propionate/acetate ratio values during the temperature transition. From the results of the multi-step strategy it could be stated that the critical process performance during temperature transition occurred between 43 and 508C, which should be taken into account to define more accurate future transition strategies. Sewage sludge thermophilic vs mesophilic biodegradability was assessed by means of anaerobic biodegradability tests, and no significant statistical differences in biodegradability or methane yields were found.

  • Enhancement of thermophilic anaerobic sludge digestion by 70 ºC pre-treatment: energy considerations

     Ferrer Martí, Ivet
    Journal of residuals science and technology
    Vol. 6, num. 1, p. 11-18
    Date of publication: 2009-01
    Journal article

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  • Pilot project of biogas production from pig manure and urine mixture at ambient temperature in Ventanilla (Lima, Peru)

     Ferrer Martí, Ivet; Gamiz, M; Almeida, M; Ruiz, A
    Waste management
    Vol. 29, num. 1, p. 168-173
    Date of publication: 2009-01
    Journal article

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  • Sludge dewatering and stabilization in drying reed beds: characterization of three full-scale systems in Catalonia, Spain

     Uggetti, Enrica; Ferrer Martí, Ivet; Garcia Serrano, Joan
    Bioresource technology
    Vol. 100, num. 17, p. 3882-3890
    Date of publication: 2009-09
    Journal article

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  • Evaluación energética de la digestión anaerobia termofílica con pre-tratamiento térmico de los fangos a 70 ºC

     Ferrer Martí, Ivet; Serrano, Elvyre; Sergio, Ponsá; Felícitas, Vázquez; Font, Xavier
    Infoenviro : actualidad y tecnología de la industria medioambiental
    Vol. 46, p. 63-66
    Date of publication: 2009-06
    Journal article

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