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

doi:10.1007/s11783-008-0001-4

Front.Environ.Sci.Eng.

2008, Vol. 2

Issue (1) : 36-43 https://doi.org/10.1007/s11783-008-0001-4

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

WANG Jianfang¹, ZHAO Qingliang¹, JIN Wenbiao², LIN Jikan³

1.School of Municipal & Environmental Engineering, Harbin Institute of Technology; 2.Harbin Institute of Technology Campus of Shenzhen University Town; 3.Bio-treat Technology Limited;

Download: PDF(170 KB) HTML
Export: BibTeX | EndNote | Reference Manager | ProCite | RefWorks

Abstract The oxic-settling-anaerobic (OSA) process is a promising wastewater treatment technique for efficiently reducing sludge production and improving the stability of process operation. In this paper, the possible factors of sludge reduction such as sludge decay, uncoupled metabolism, and anaerobic oxidation with low sludge production were discussed in the OSA process. It has been confirmed that sludge decay is the decisive cause in the OSA process, accounting for 66.7% of sludge production reduction. Sludge decay includes hydrolysis and acidogenesis of dead microorganisms and particle organic carbon adsorbed in sludge floc and endogenous metabolism. By batch experiments, it has been proven that there is energetic uncoupling in the OSA system since microorganisms were exposed to alternative anaerobic and aerobic environment. It accounts for about 7.5% of sludge production reduction. Soluble chemical oxygen demand (SCOD) released from the anaerobic sludge tank in the OSA process was used as the substrate for cryptic growth. The substrate was used for anoxic denitrifying, anaerobic phosphorus release, sulfate reduction, and methane production. These 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 process. It has been concluded that multiple causes resulted in the minimization of excess sludge in the OSA system. The 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 (polymerase 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.

Issue Date: 05 March 2008

Cite this article:

WANG Jianfang,ZHAO Qingliang,JIN Wenbiao, et al. Mechanism on minimization of excess sludge in oxic-settling-anaerobic (OSA) process[J]. Front.Environ.Sci.Eng., 2008, 2(1): 36-43.

URL:

https://academic.hep.com.cn/fese/EN/10.1007/s11783-008-0001-4
https://academic.hep.com.cn/fese/EN/Y2008/V2/I1/36

1	Zhao Q L Kugel G Thermopholic/mesophilic digestionof sewage sludge and organic wasteJ. Environ.Sci. Health. 1997 3122112231
2	Liu Y Tay J H Strategy for minimization ofexcess sludge production from the activated sludge processBiotechnol. Adv. 2001 1997107
3	Sabya S Djafera M Chen G H Effect of low ORP in anoxic sludge zone on excess sludgeproduction in oxic-settling-anoxic activated sludge processWater Res. 2003 371120
4	Chudoba P Chdoba J Capdeville B The aspect of energetic uncoupling of microbial growthin the activated sludge process: OSA systemWater Sci. Technol. 1992 2624772480
5	Chen G H An K J Saby S et al.Possible cause of excess sludge reduction in anoxic-settling-anaerobic activated sludge process (OSA process)Water Res. 2003 3738553866
6	American Pubic Health Association (APHA), American WaterWorks Association (AWWA). Standard Methods for the Examinationof Water and Wastewater. 19th ed.Washington,USAAmerican Pubic Health Association,American Water Works Association 1995
7	Frølund B Griebe T Nielsen P H Enzymatic activity in the activated-sludge floc matrixAppl. Microbiol. Biotechnol. 1995 43755761
8	Dubois M Gilles K A Hamilton J K et al.Colorimetric method for determination of sugarsand related substancesAnal. Chem. 1956 28350356
9	Li X Z Zhao Q L Efficiency of biological treatmentaffected by high strength of ammonium-nitrogen in leachate and chemicalprecipitation of ammonium-nitrogen as pretreatmentChemosphere 2001 413743
10	Zhou J Z Bruns M A Tiedje J M DNA recovery from soils of diverse compositionAppl. Environ. Microbiol 1996 62(2)316322
11	Muyzer G De Waal E C Uitterlinden A G Profiling of complex microbial populations by denaturinggradient gel electrophoresis analysis of polymerase chain reactionamplified genes coding for 16SrRNAAppl.Environ. Microbiol 1993 59(3)695700
12	Chen T S Li J J Cen Y H Sun G P Analysis ofmicrobial diversity and community composition after enrichment withdeodorizing biofilter by DG-DGGE. ChiJ.Appl. Environ. Biol. 2006 12(1)113117(in Chinese)
13	Metacalf & Eddy, Inc. Wasterwater EngineeringTreatment and Reuse. 4th ed. BeijingTsinghua University Press 2003 567627
14	McSwain B S Irvine R L Hausner M Wilderer P A Compositionand distribution of extracellular polymeric substances in aerobicflocs and granular sludgeAppl. Environ.Microb. 2005 71(2)10511057
15	Herbert D Elsworth R Telling R C The continuous culture of bacteria: A theoretical and experimentalstudyJ. Gen. Appl. Microbiol. 1956 114601
16	Wang W H Jung Y J Kiso Y Yamada T Min K S Excess sludge reduction performance ofan aerobic SBR process equipped with a submerged mesh filter unitProcess Biochem. 2006 41745751
17	Low E W Chase H A Milner M G Curtis T P Uncouplingof metabolism to reduce biomass production in the activated sludgeprocessWater Res. 2000 34(12)32043212
18	Rittmann B E McCarty P L Environmental BiotechnologyPrinciples and ApplicationsBeijingTsinghua University Press 2004 165493(in Chinese)
19	Zehnder A J B Wuhrmann K Titatium(III) citrate as anon-toxic oxidation reduction buffering system for the culture ofanaerobesScience 1976 19411651166
20	Higgins M J Novak J T The effect of cations on thesettling and dewatering of activated sludgeWater Environ. Res. 1997 69(2)215224
21	Wang J F Jin W B Zhao Q L et al.Study on performance of treating wastewater andanti-impaction in oxic-settling-anaerobic (OSA) process for minimizationof excess sludgeEnvironmental Science 2007 28(11)8388(in Chinese)

Viewed

Full text

Abstract

Cited

Shared

Discussed