Sulfate reduction in methanogenic bioreactors

• Published in: FEMS microbiology reviews 1994-10, Vol.15 (2‐3), p.119-136
• Main Authors: J.W.H., Stefanie, Elferink, Oude, Visser, André, Hulshoff Pol, Look W., Stams, Alfons J.M.
• Format: Article
• Language: English
• Subjects: Acetate; Anaerobic conditions; Bacteriology; Biological and medical sciences; Biotechnology; Butyrate; Environmental Technology; Fundamental and applied biological sciences. Psychology; Hydrogen; Interspecies electron transfer; Laboratorium voor Microbiologie; Metabolism. Enzymes; Methanogenesis; Methanogenic degradation; Methods. Procedures. Technologies; Microbial engineering. Fermentation and microbial culture technology; Microbiological Laboratory; Microbiologie; Microbiology; Milieutechnologie; Propionate; Sectie Milieutechnologie; Sub-department of Environmental Technology; Sulfate reduction; Sulfide toxicity; Syntrophy; WIMEK
• ISSN: 0168-6445; 1574-6976
• DOI: 10.1111/j.1574-6976.1994.tb00130.x

: In the anaerobic treatment of sulfate‐containing wastewater, sulfate reduction interferes with methanogenesis. Both mutualistic and competitive interactions between sulfate‐reducing bacteria and methanogenic bacteria have been observed. Sulfate reducers will compete with methanogens for the common substrates hydrogen, formate and acetate. In general, sulfate reducers have better growth kinetic properties than methanogens, but additional factors which may be of importance in the competition are adherence properties, mixed substrate utilization, affinity for sulfate of sulfate reducers, relative numbers of bacteria, and reactor conditions such as pH, temperature and sulfide concentration. Sulfate reducers also compete with syntrophic methanogenic consortia involved in the degradation of substrates like propionate and butyrate. In the absence of sulfate these methanogenic consortia are very important, but in the presence of sulfate they are thought to be easily outcompeted by sulfate reducers. However, at relatively low sulfate concentrations, syntrophic degradation of propionate and butyrate coupled to HZ removal via sulfate reduction rather than via methanogenesis may become important. A remarkable feature of some sulfate reducers is their ability to grow fermentatively or to grow in syntrophic association with methanogens in the absence of sulfate.