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Published on: October 15, 2015
Pilot-scale investigation of sludge reduction in aerobic digestion system with endospore-forming bacteria
Kyu Won Seo1, Yong-Su Choi2, Man Bock Gu3
1Small & Medium Enterprises Support Center, Korea Institute of Science and Technology, Seoul 02792, South Korea; Department of Biotechnology, Korea University, Seoul 02841, South Korea.
Abstract:
A pilot-scale investigation of membrane-based aerobic digestion system dominated by endospore-forming bacteria was evaluated as one of the potential sludge treatment processes (STP). Most of the organic matter in the sludge was removed (90.1%) by the particular bacteria in the STP, which consisted of mixed liquor suspended solid (MLSS) contact reactor (MCR), MLSS oxidation reactor (MOR), and membrane bioreactor (MBR). The sludge was accumulated in the MBR without wasting, and then the effluent in STP was fed into the first step in water resource recovery facility (WRRF). According to the analysis of microbial communities in all reactors, various Bacillus species were present in the STP, mainly due to their intrinsic resistance to the extreme conditions. As the surviving Bacillus species might consume degraded microorganisms for their growth, these endospore-forming bacteria-based STP could be suitable for the sludge reduction when they operated for a long time.
