Psychrophilic Methane Fermentation of Excess Sludge by Enrichment Culture

概要

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This study was carried out to determine the possibility of the psychrophilic methane fermentation of the excess sludge produced from fish-processing wastewater treatment. Three different kinds of seed sludge, named M seed sludge, K seed sludge and KL seed sludge were used for batch methane fermentation in Erlenmeyer flasks. M seed sludge was mesophilic, while the other two were prepared in our laboratory by soil collection to obtain a psychrophilic biological community. The effects of temperature on the total volume of biogas generated and on the rate of biogas generation were examined. The activity of K seed sludge with respect to gas yield at 15℃ was found to be 1.6-fold higher than that of M seed sludge. Enrichment techniques were then used to accumulate psychrophilic bacteria in KL seed sludge, and the activity at 15℃ increased by about two times due to these techniques. Comparison of the three kinds of seed sludge indicates that methane fermentation at low temperature may be feasible, and therefore further study to isolate the psychrophilic bacteria in anaerobic digestion is needed.
公益社団法人日本生物工学会の論文
1988-04-25