Abstract
The characteristics of accumulated substances were examined in two types of the anaerobic reactor membrane separation (ARMS) system.For the ARMS process, the gas production rate from anaerobic digestion of wastewater containing long-chain fatty acid was higher than that in the chemostat type anaerobic reactor. Volatile fatty acids (VFAs) didn't accumulate in the ARMS process, but a VFAs concentration of 1,500 mg·l-1 accumulated in the chemostat type anaerobic reactor. The removal rate of COD in the ARMS process was over 99%, and 80% of COD components in the influent was converted to the methane gas. In the ARMS process, number of bacteria increased by one order after 90-days operation but no significant change was observed in the chemostat type anaerobic reactor. But, the bio-activities per bacterial number decreased in spite of the increase of the bacterial number in the ARMS process.The accumulated organic substances in the ARMS process were fractionated by membrane filtration and ultra membrane filtration. Results showed that bio-activity of permeate decreased as time of operation increased, but that of particulate substances increased.
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