Two‐stage anaerobic digestion for reduced hydrogen sulphide production

Journal of Chemical Technology and Biotechnology - Tập 91 Số 4 - Trang 1055-1062 - 2016
Jan Moestedt1,2, Erik Nordell3, Sara Hallin4, Anna Schnürer2
1Department of Microbiology, BioCenter Swedish University of Agricultural Sciences Box 7025 SE‐750 07 Uppsala Sweden
2Department of Microbiology, BioCenter, Swedish University of Agricultural Sciences, Box 7025, SE-750 07 Uppsala, Sweden
3Tekniska verken i Linköping AB Department of Biogas R&D Box 1500 SE‐581 15 Linköping Sweden
4Tekniska verken i Linköping AB Department of Biogas Production Box 1500 SE‐581 15 Linköping Sweden

Tóm tắt

AbstractBACKGROUNDThis study evaluated a two‐stage process as an alternative to single‐stage anaerobic degradation, with the aim of separating sulphidogenesis and methanogenesis while treating a mixture of organic fraction municipal solid waste (OFMSW) and thin stillage. For full‐scale applications, no pH regulation was applied. The hydrolytic/acidogenic stage was evaluated with a hydraulic retention time (HRT) between 3 and 15 days, with and without recirculation of methanogenic stage reactor material.RESULTSHomoacetogenesis dominated in the hydrolytic/acidogenic stage. However, sulphate reduction was unsuccessful. Using a two‐stage approach with OFMSW at a HRT of 10 days in the first stage and 28 days in the second stage resulted in a 12% increase in specific methane production and a 6% increase in methane content. The two‐stage process with thin stillage was less effective, probably because of decreasing pH (<4) in the first stage.CONCLUSIONTwo‐stage operation resulted in a pH too low (~4) for successful sulphate reduction in the first stage. However the resulting pH and applied organic loading rate caused homoacetogenesis to dominate, producing acetate as a favourable energy carrier between the stages. © 2015 Society of Chemical Industry

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Journal of Chemical Technology and Biotechnology

Tập 91 Số 4

1055-1062

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