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Mechanism on minimization of excess sludge in oxic-settling- anaerobic (OSA) process

Frontiers of Environmental Science & Engineering 2008年第1期2卷 36-43页

作者： Jianfang WANG Qingliang ZHAO Wenbiao JIN Jikan LIN School of Municipal&Environmental Engineering Harbin Institute of TechnologyHarbin 150090China Harbin Institute of Technology Campus of Shenzhen University Town Shenzhen 518055China Bio-treat Technology Limited Dongguan 523581China

The oxic-settling-anaerobic(OSA)process is a promising wastewater treatment technique for efficiently reducing sludge production and improving the stability of process *** this paper,the possible factors of sludge reduction such as sludge decay,uncoupled metabol-ism,and anaerobic oxidation with low sludge production were discussed in the OSA *** has been confirmed that sludge decay is the decisive cause in the OSA process,accounting for 66.7%of sludge production *** decay includes hydrolysis and acidogenesis of dead microorganisms and particle organic carbon adsorbed in sludge floc and endogenous *** batch experi-ments,it has been proven that there is energetic uncoupling in the OSA system since microorganisms were exposed to alternative anaerobic and aerobic *** accounts for about 7.5%of sludge production *** chemical oxygen demand(SCOD)released from the anaerobic sludge tank in the OSA process was used as the substrate for cryptic *** substrate was used for anoxic denitrifying,anaerobic phosphorus release,sulfate reduction,and methane *** anaerobic reactions in the sludge anaerobic tank have lower sludge production than in the aerobic oxidation when equivalent SCOD is consumed,which may lead to approximately 23%of sludge reduction in the OSA *** has been concluded that multiple causes resulted in the minimization of excess sludge in the OSA *** microbial community structure and diversity of sludge samples from the CAS(conventional activated sludge)and OSA systems were investigated by 16 SrDNA PCR-DG-DGGE(poly-merase chain reaction-double gradient-denaturing gradient gel electrophoresis).DGGE profile and cluster analysis showed more abundant species in the OSA system contrasting to microbial communities in the CAS system.

关键词： sludge minimization sludge decay uncoupled metabolism denaturing gradient gel electrophoresis(DGGE) microbial community

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