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Experimental Study on minimization of sludge Production by Ozonation Process

Journal of Donghua University(English Edition) 2003年第3期20卷 69-71页

作者：何圣兵薛罡王宝贞王琳 School of Municipal & Environmental Engineering Harbin Institute of Technology Harbin 150090 College of Environmental Science and Engineering Donghua University Shanghai200051 School of Municipal & Environmental Engineering Harbin Institute of TechnologyHarbin150090

Based on the hypothesis of reducing sludge production under cryptic growth conditions, ozone was used as cell lysis agent to treat excess sludge,and then the ozonated supernatant was returned to the aeration tank. The results show that COD and NH+4-N removal efficiencies in ozonation process were 87.96% and 84.42%, respectively. Meanwhile, a low excess sludge yield coefficient of 0. 113 ( g SS/g COD removed) was obtained. Compared with that of the control test, the process configuration decreased the excess sludge production by 51.3%.

关键词： ozonation sludge minimization cryptic growth excess sludge yield

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

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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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Feasibility of using lysozyme to reduce excess sludge in activated sludge process

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Journal of Central South University 2013年第9期20卷 2472-2477页

作者：宋勇施周陈世洋罗璐 Key Laboratory of Building Safety and Energy Efficiency of Ministry of Education (College of Civil Engineering Hunan University) Department of Biological and Environmental Engineering Changsha College

Lysozyme reaction was developed as a novel technique for minimizing the amount of excess sludge in the sequential batch reactor(SBR).In the present work,excess sludge taken from a SBR system was treated by lysozyme reaction and then returned to the *** quality of the effluent water and characteristics of the activated sludge in the SBR were analyzed to determine the effectiveness of the reduction *** results show that excess sludge production could be reduced to almost 100%in the first30 d of operation and could be reduced to further by 40%in the succeeding 20 d or *** these time periods,the average removal efficiencies of the chemical oxygen demand and total nitrogen are 87.38%and 52.78%,respectively,whereas the average total phosphorous in the effluent is nearly 17.18%greater than that of the effluent of the reference *** 50 d of operation,the sludge floc size is in the range of 20 to 80μm,which was smaller than the size prior to the start of the hydrolysis and the ratio of mixed liquor volatile suspended solids/mixed liquor suspended solids increases from 86%to 90%.

关键词： cell lysis sludge minimization sequential batch reactor lysozyme ATP

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