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Interactive effects of the electron acceptor sulphate and o-cresol on the methanogenic degradation of hexanoate

Holmes, Sulisti and Senior, Eric and Watson-Craik, I.A. (2002) Interactive effects of the electron acceptor sulphate and o-cresol on the methanogenic degradation of hexanoate. Water Research, 36 (3). pp. 561-576. ISSN 0043-1354

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Abstract

A three-stage continuous culture system was used to segregate the component microbial groups of a methanogenic hexanoate-degrading association enriched from anaerobic refuse. The inhibitory effects of o-cresol concentrations (2–20 mM) on the fermentative, acetogenic, sulphate-reducing and methanogenic bacteria were then assessed in the presence of either 1.4 or 3.5 mM sulphate in the influent medium. The sulphate-reducing bacteria (SRB) in the 1.4 mM sulphate-supplemented systems were the most sensitive to o-cresol, with 29.3 and 56.6% inhibition on supplementation with 4 and 6 mM o-cresol, respectively. With 3.5 mM supplementation, inhibition was 4.5 and 19.4%, respectively. Methanogenesis was not inhibited by concentrations <10 mM o-cresol, and complete inhibition was recorded only at concentrations ⩾10 mM. Both fermentation and acetogenesis were affected by inhibition of the electron sinks. The increase in influent sulphate concentration promoted electron flow to sulphidogenesis, as predicted on thermodynamic criteria, but did not affect the relative sensitivity of the different physiological groups.

Item type: Article
ID code: 38924
Keywords: o-Cresol, Methanogenesis, Sulphate-reducing bacteria, Inhibition, Pharmacy and materia medica
Subjects: Medicine > Pharmacy and materia medica
Department: Faculty of Science > Strathclyde Institute of Pharmacy and Biomedical Sciences
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 03 Apr 2012 16:57
    Last modified: 16 Jul 2013 21:30
    URI: http://strathprints.strath.ac.uk/id/eprint/38924

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