Mesophilic and thermophilic anaerobic biodegradability of water hyacinth pre-treated at 80 °C |
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| Authors: | Ivet Ferrer Jordi Palatsi Elena Campos Xavier Flotats |
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| Institution: | 1. Environmental Engineering Division, Department of Hydraulic, Maritime and Environmental Engineering. Technical University of Catalonia, C/ Jordi Girona 1-3, E-08034 Barcelona, Spain;2. GIRO Technological Centre, Rambla Pompeu Fabra 1, E-08100 Mollet del Vallès, Barcelona, Spain;3. Laboratory of Environmental Engineering, Centre UdL-IRTA, Rovira Roure 191, E-25198 Lleida, Spain;4. Department of Agrifood Engineering and Biotechnology, Technical University of Catalonia, Parc Mediterrani de la Tecnologia Edifici D-4, E-08860 Castelldefels, Barcelona, Spain;1. Graduate School of Engineering, Soka University, 1-236 Tangi-cho, Hachioji, Tokyo 192-8577, Japan;2. Lake Biwa Environmental Research Institute, 5-34 Yanagasaki, Otsu, Shiga 520-0022, Japan;3. School of Environmental Science, University of Shiga Prefecture, 2500 Hassaka-cho, Hikone, Shiga 522-8533, Japan;1. Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India;2. Department of Chemical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India;3. Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India;1. Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India;2. Department of Civil Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, Assam, India;1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China;2. Department of Life Science and Engineering, Jining University, Jining 273155, China |
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| Abstract: | 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. |
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