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Title: Acetic acid inhibition on methanogens in a two-phase anaerobic process
Authors: Ng, Wun Jern
Guo, Chenghong
Zhou, Yan
Wang, J. Y.
Maspolim, Yogananda
Xiao, Keke
Keywords: DRNTU::Engineering::Environmental engineering
Issue Date: 2013
Source: Xiao, K. K., Guo, C., Zhou, Y., Maspolim, Y., Wang, J. Y., & Ng, W. J. (2013). Acetic acid inhibition on methanogens in a two-phase anaerobic process. Biochemical engineering journal, 75,1-7.
Series/Report no.: Biochemical engineering journal
Abstract: The inhibitory effect of acetic acid on methanogens in a two-phase anaerobic process was evaluated. The results in this study showed that some methanogens still existed in the acidogenic phase although their dominance in the total microbial community was only 1% compared to 9.6% in the methanogenic phase. The inhibition threshold of acetic acid on acidogenic phase methanogens was, however, higher than that on methanogenic phase methanogens. At pH 6.00, acetic acid inhibition on methanogenic phase methanogens was observed when acetic acid concentration was higher than 1619.47 mg HAc/L although there was no obvious inhibition on acidogenic phase methanogens in the range of 1646.47–2781.19 mg HAc/L. There was also no acetic acid inhibition on acidogenic phase methanogens at pH 5.50, 6.00 and 6.50 in the range of 565.29–2781.19 mg HAc/L. However, for methanogenic phase methanogens, the inhibition was obvious and a second order substrate inhibition model, qs = qmS/[Ks + S + (S2/Ki)], could be adapted to describe the inhibition kinetics and mechanism of undissociated acetic acid on methanogenic phase methanogens. The results showed substrate saturation constant Ks, substrate inhibition constant Ki, and maximum specific utilization rate of acetic acid qm, were 1.66 mg unHAc/L, 145.17 mg unHAc/L, and 3.53 mg HAc/L g MLVSS h, respectively.
ISSN: 1369-703X
DOI: 10.1016/j.bej.2013.03.011
Schools: School of Civil and Environmental Engineering 
Research Centres: Advanced Environmental Biotechnology Centre (AEBC) 
Nanyang Environment and Water Research Institute 
Residues and Resource Reclamation Centre 
Rights: © 2013 Elsevier B.V. This is the author created version of a work that has been peer reviewed and accepted for publication by Biochemical Engineering Journal, Elsevier B.V. It incorporates referee’s comments but changes resulting from the publishing process, such as copyediting, structural formatting, may not be reflected in this document. The published version is available at: [].
Fulltext Permission: open
Fulltext Availability: With Fulltext
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