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Trophic link between syntrophic acetogens and homoacetogens during the anaerobic acidogenic fermentation of sewage sludge

Paper ID Volume ID Publish Year Pages File Format Full-Text
3435 171 2013 8 PDF Available
Title
Trophic link between syntrophic acetogens and homoacetogens during the anaerobic acidogenic fermentation of sewage sludge
Abstract

Acetate production during anaerobic sludge treatment has significant economic and environmental benefits. In this study, trophic links between syntrophic acetogens and homoacetogens in the anaerobic acidogenic fermentation of sewage sludge were investigated using methanogenic inhibitor 2-bromoethanesulfonate (BES) to block the methanogenesis pathway and butyrate to enhance syntrophic acetogenesis. The Gibbs free energies (ΔG) of the butyrate-degrading and homoacetogenic processes were close to the thermodynamic threshold of the reaction activity (−15 kJ/mol). In addition, microbial quantification analysis revealed that the growth of syntrophic acetogenic bacteria and homoacetogens in the treatment incubations was higher than that of the control. The results indicated that hydrogen-producing butyrate degraders are stimulated with homoacetogens when methanogenesis was specifically inhibited.

► The trophic links between syntrophic acetogens and homoacetogens was studied. ► The butyrate degraders were stimulated by homoacetogens with BES addition. ► The possible organic carbon flux under suppressed methanogenesis was estimated.

Keywords
Waste treatment; Sewage sludge; Anaerobic digestion; Acetic acid; Biodegradation; Homoacetogens; Syntrophic acetogens
First Page Preview
Trophic link between syntrophic acetogens and homoacetogens during the anaerobic acidogenic fermentation of sewage sludge
Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 70, 15 January 2013, Pages 1–8
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering