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KMID : 1094720130180020306
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Biotechnology and Bioprocess Engineering
2013 Volume.18 No. 2 p.306 ~ p.312
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Biochemical methane potential (BMP) test for thickened sludge using anaerobic granular sludge at different inoculum/substrate ratios
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Lim Seung-Joo
Fox Peter
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Abstract
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The biochemical methane potential (BMP) test for thickened sludge was evaluated at three different inoculum/substrate (I:S) ratios. The cumulative methane yield was 51.4 mL CH4/g VSadded at an I:S ratio of 1:1, 76.3 mL CH4/g VSadded at an I:S ratio of 1:3, and 21.9 mL CH4/g VSadded at an I:S ratio of 1:8. The greatest ultimate methane yield and methane production rate constant were achieved at an I:S ratio of 1:3, whereas the least was obtained at an I:S ratio of 1:8. The maximum methane production rate constant was 0.38/day and the minimum methane production rate constant was 0.0016/day. For the case of a lower I:S ratio, the biomass activity may be affected due to the low substrate concentration. On the other hand, for the case of higher I:S ratios, anaerobic digestion of thickened sludge was inhibited by higher concentrations of volatile fatty acids and lower pH.
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KEYWORD
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biochemical methane potential, methane yield, inoculum/substrate ratio, thickened sludge
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