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Comparative biochemical methane potential of paragrass using an unacclimated and an acclimated microbial consortium

Nuchdang, Sasikarn, Khemkhao, Maneerat, Techkarnjanaruk, Somkiet, Phalakornkule, Chantaraporn
Bioresource technology 2015 v.183 pp. 111-119
acetates, anaerobic digestion, inoculum, methane, methane production, microbial activity, oil mill effluents, sewage treatment, sludge, wastewater treatment
The effect of inoculum sources on the anaerobic digestion of paragrass was investigated. Two types of sludge were used as the inoculums: an anaerobic sludge obtained from a domestic wastewater treatment plant (OS) and a sludge acclimated to fibrous substrates in raw palm oil mill effluent (AMC). Microbial activity assays showed that the AMC had hydrolytic and acetogenic activities two times greater than the activities of the OS. In addition, the production of methane from acetate by the AMC occurred without a lag phase, while it took 8days for the OS to start producing methane from the same substrate. The biochemical methane potential after 80days digestion was 316ml STP/g VSadded using the AMC, and 277ml STP/g VSadded using the OS. The methane potential of the paragrass was estimated to be 3337Nm3 CH4/haa.