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Issue
Korean Journal of Chemical Engineering,
Vol.26, No.5, 1319-1322, 2009
Analysis of methane production inhibition for treatment of sewage sludge containing sulfate using an anaerobic continuous degradation process
Jeong TY, Chung HK, Yeom SH, Choi SS
The inhibition of methane production in the continuous anaerobic degradation process for the treatment of sewage sludge containing sulfate was investigated. Also, the competition between sulfate-reducing bacteria (SRB) and methane-producing bacteria (MPB) with COD/sulfate ratio was explained in terms of electron flow. The methane production rate was 0.07, 0.13, 0.24, 0.31 and 0.33 l-CH4 g-COD^(-1) when the initial COD/sulfate ratio was 3.3, 5.0, 6.7, 10 and 20, respectively. The numbers of SRB and MPB were counted after the continuous reactor reached steady state and the two bacteria showed opposite growth behaviors with COD/sulfate ratio. The inhibition by sulfate compounds was found to follow the uncompetitive model and inhibition constants were 24.57 and 87.99 mg ∫^(-1) for SRB and MPB, respectively. These results can be useful data for the efficient treatment of sewage sludge in a continuous anaerobic degradation process.
Keywords: Continuous Anaerobic Degradation; Inhibition of Methane Production; Uncompetitive Model
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