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Pretreatment of energy crops with sodium hydroxide and cellulolytic enzymes to increase biogas production
Affiliation:1. Textile Research Institute, ul. Brzezinska 5/15, 92-103 Lodz, Poland;2. Lodz University of Technology, Faculty of Process and Environmental Engineering, Department of Bioprocess Engineering, ul. Wolczanska 213, 90-924 Lodz, Poland;1. Pulp and Paper Laboratory, Department of Forestry Engineering, Federal University of Viçosa, Av. P. H. Rolfs, s/n, Campus, 36570-900 Viçosa, Minas Gerais, Brazil;2. Department of Biochemistry, Federal University of Viçosa, Av. P. H. Rolfs, s/n, Campus, 36570-900 Viçosa, Minas Gerais, Brazil;1. Department of Plant Cell Biotechnology, CSIR-Central Food Technological Research Institute, Mysore, Karnataka, India;2. AcSIR-Academy of Scientific and Innovative Research, India;3. Microbial Processes and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology, Trivandrum, Kerala, India;1. Advanced Water Management Centre (AWMC), The University of Queensland, QLD 4072, Australia;2. Key Laboratory of Urban Stormwater System and Water Environment/R&D Centre for Sustainable Wastewater Treatment (Beijing University of Civil Engineering and Architecture), Ministry of Education, Beijing 100044, PR China;1. School of Humanities, Universiti Sains Malaysia, 11800 Pulau Pinang, Penang, Malaysia;2. Johnson Shoyama Graduate School of Public Policy, University of Regina, Regina, SK S4P 4V5, Canada;3. Dept. of Agricultural Extension & Information System, Sher-e-Bangla Agricultural University, Dhaka 1207, Bangladesh;4. Christian-Albrechts University of Kiel, Institute of Geography, Ludewig-Meyn-Str. 14, 24098 Kiel, Germany
Abstract:This work presents the influence of alkali pretreatment on the enzymatic hydrolysis and efficiency of anaerobic digestion of lignocellulosic biomass pretreated both in a one- (chemical or enzymatic) and two-step (chemical and enzymatic) process. In this study two species of energy crops were used Miscanthus giganteus and Sida hermaphrodita. The aim of this work was to compare biogas production and methane yield during fermentation of pretreated and untreated energy crops. The results show that alkali pretreatment is necessary for the effective biogas generation from plant material due to high delignification level and significant hemicellulose degradation. The two-step hydrolysis process consisting on the alkali and enzymatic step leads to the release of high concentrations of glucose (about 20 g L?1). The best results were achieved for M. giganteus with biogas production yield of 421.5 Ndm3 kg TS?1 and with methane production yield of 257 Ndm3 kg TS?1.
Keywords:Anaerobic digestion  Alkali pretreatment  Sodium hydroxide  Biogas production  Methane yield
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