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Two-stage anaerobic digestion for reduced hydrogen sulphide production.

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Bibliographic Details
Title: Two-stage anaerobic digestion for reduced hydrogen sulphide production.
Authors: Moestedt, Jan1,2, Nordell, Erik1, Hallin, Sara3, Schnürer, Anna2
Source: Journal of Chemical Technology & Biotechnology. Apr2016, Vol. 91 Issue 4, p1055-1062. 8p.
Subjects: Anaerobic digestion, Sulfide synthesis, Municipal solid waste incinerator residues, Hydrogen sulfide, RF values (Chromatography), Separation (Technology)
Abstract: BACKGROUND This 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. RESULTS Homoacetogenesis 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. CONCLUSION Two-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 [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
Description
Abstract:BACKGROUND This 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. RESULTS Homoacetogenesis 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. CONCLUSION Two-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 [ABSTRACT FROM AUTHOR]
ISSN:02682575
DOI:10.1002/jctb.4682