Pilot-scale investigation of sludge reduction in aerobic digestion system with endospore-forming bacteria

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 o...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2017-11, Vol.186, p.202-208
Main Authors: Seo, Kyu Won, Choi, Yong-Su, Gu, Man Bock, Kwon, Eilhann E., Tsang, Yiu Fai, Rinklebe, Jörg, Park, Chanhyuk
Format: Article
Language:English
Subjects:
Aerobic digestion
Aerobiosis
Bacillus
Bioreactors - microbiology
Endospore-forming bacteria
Endospore-Forming Bacteria - physiology
Pilot Projects
Sewage - microbiology
Sewage sludge
Sludge treatment
Waste Disposal, Fluid - methods
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Summary: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. [Display omitted] •A pilot-scale sludge treatment process was developed and investigated.•Membrane-based aerobic digestion system could accumulate the sludge.•90% of sludge reduction was achieved in sludge treatment process.•Bacillus species was dominant and influenced on the sludge reduction.•Endospore-forming bacteria-based process could be suitable for sludge reduction.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2017.07.150