Wastewater Purification: Aerobic Granulation in Sequencing Batch Reactors - Chapter 8 doc

... LiuCONTENTS 8. 1 Introduction 131 8. 2 Size-Dependent Kinetic Behaviors of Aerobic Granules 132 8. 3 Description of Diffusion Resistance in Aerobic Granules 133 8. 4 Simulation of Mass Transfer in Aerobic ... 445–457.Yang,S.F.,Liu,Q.S.,Tay,J.H.,andLiu,Y.2004.Growthkineticsofaerobicgranulesdevel - oped in sequencing batch reactors. Lett Appl Microbiol 38: 106–112.53671_C0 08. indd 147 10/29/07 7:20:25 AM© 20 08 by Taylor & Francis Group, LLC© 20 08 by Taylor & ... operatingparameters on aerobic granulation in sequencing batch reactors (SBRs) (chapters 1to7).However,verylimitedinformationiscurrentlyavailableaboutthediffusionbehaviorsofsubstancesinsideaerobicgranules.Tayetal.(2002)foundthatamodeldye...

... 417–427.Su,K.Z.andYu,H.Q.2005.Gasholdupandoxygentransferinanaerobicgranule-based sequencing batch reactor.Biochem Eng J 25: 201–207.Su,K.Z.andYu,H.Q.2006.Ageneralizedmodelforaerobicgranule-basedsequencing batch reactor. I. Model ... formation of aerobic granules.J Environ Eng 131: 86 –92.Yang,S.F.,Liu,Q.S.,Tay,J.H.,andLiu,Y.2004.Growthkineticsofaerobicgranulesdevelopedinsequencingbatchreactors.Lett Appl Microbiol 38: 106–112.53671_C007.indd ... Microbiol Biotechnol 67: 484 – 488 .Withpermission.)53671_C007.indd 1 18 10/29/07 7: 18: 23 AM© 20 08 by Taylor & Francis Group, LLC© 20 08 by Taylor & Francis Group, LLC1 28 Wastewater Purification7....

... Zhi-Wu WangCONTENTS10.1 Introduction 181 10.2 Main Composition of EPS in Aerobic Granules 181 10.3 Major Factors In uencing EPS Production In Aerobic Granules 183 10.4 The Role of EPS in Aerobic ... hydrophilicsurface,butmorewithhydrophobicsurfacesofothercells(Ghigo2003).Sofar,differentviewsexistwithregardtotheroleofEPSinaerobicgranulation.Di Iaconi et al. (2006) reported that the main component of EPS in aerobic granularbiomass in a sequencing batch biolter reactor was made of proteins, and protein-richEPSwouldimprovethestabilityofgranularbiomassstructure.Asthemaincomponentofproteinsisaminoacids,whichoftencarrynegativecharges,theywillcontribute ... composition, substrate loading rate, hydraulic retention time, hydro - dynamic shear force, settling time in sequencing batch reactors (SBRs), feast-famineregimeninSBRs,culturetemperature,etc.,maystimulatebacteriatosecretemoreEPS.ThecompositionofEPSisalsorelatedtothecharacteristicsofthefeedwaste - water,forexampleEPSinanaerobicgranulesgrownonprotein-richwastewaterhadhighproteinandDNAlevels,whereashighpolysaccharidescontentwasfoundinanaerobicgranulesfedbyothertypesoforganicwastewaters(BatstoneandKeller2001).Inaddition,thedeciencyofnitrogenwasfoundtofavortheproductionofEPS,...

... exist in the present literature.14.3 INFLUENCE OF SHORT STARVATION ON AEROBIC GRANULESToofferin-depthinsightsintotheroleofstarvationinaerobicgranulation,Z W.Wangetal.(2006)investigatedtheinuenceofshortstarvationonaerobicgranulesas ... aggregate.BasedontheirstudyofaerobicgranulationinSBRs,Li,Kuba,andKusuda(2006)thoughtthat“aerobicgranulationisinitiatedbystarvationandcooperatedbyshearforceandanaerobicmetabolism,”andfurtherproposedanEPS-relatedpathwayof aerobic granulation, as illustrated in gure 14.9. According to the interpretation by Li,Kuba,andKusuda(2006),inthebeginning,starvationplaysanessentialroleinaerobic granulation, ... starvation-induced hydrophobicity is agoverningfactorinaerobicgranulationintheSBR.Asshowninchapter9,cellsurfacehydrophobicityplaysacrucialroleintheformation of biolm and biogranules. In a thermodynamic...

... Germany.Wang,Z.P.,Liu,L.,Yao,J.,andCai,W.2006.Effectsofextracellularpolymericsubstanceson aerobic granulation in sequencing batch reactors. Chemosphere 63: 17 28 1735.Wang,Z W.2007.Insightsintomechanismofaerobicgranulationinasequencingbatchreactor. Ph.D. thesis, ... characteristics of aerobic granules in sequencing batch reactors. J Environ Sci (China) 18: 86 4 87 1.53671_C015.indd 285 10/29/07 7: 38: 27 AM© 20 08 by Taylor & Francis Group, LLC© 20 08 by Taylor ... 711–7 18. )Operating Time (days)0 204060SVI (mL g–1)204060 80 100120140160 180 FIGURE 15.27 ChangeinSVIduringaerobicgranulationinanSBRfedwithasynthetic wastewater containing mainly sucrose,...

... explanation without intent to infringe.Library of Congress Cataloging -in- Publication Data Wastewater purification : aerobic granulation in sequencing batch reactors / editor, Yu Liu.p. cm.Includes bibliographical ... Pressure Theory for Aerobic Granulation in Sequencing Batch Reactors 85 Yu Liu and Zhi-Wu Wang Chapter 7 Growth Kinetics of Aerobic Granules 111Qi-Shan Liu and Yu Liu Chapter 8 Diffusion of Substrate ... Digestion,99–103.May22–26,1 988 .Bologna,Italy,Arrojo,B.,Mosquera-Corral,A.,Garrido,J.M.,andMendez,R.2004.Aerobicgranulationwith industrial wastewater in sequencing batch reactors. Water Res 38: 3 389 –3399.Beeftink, H. H. 1 987 . Anaerobic bacterial aggregates. Ph.D....

... 206–215.Kwok,W.K.,Picioreanu,C.,Ong,S.L.,vanLoosdrecht,M.C.M.,Ng,W.J.,andHeijnen,J.J.19 98 .In uenceofbiomassproductionanddetachmentforcesonbiolmstructuresinabiolm airlift suspension reactor.Biotechnol Bioeng 58: 400–407.Liu,Q.S.2003.Aerobicgranulationinsequencingbatchreactor.Ph.D.Thesis,NanyangTechnology ... 102–107.Ohashi,A.andHarada,H.1994.Adhesionstrengthofbiolmdevelopedinanattached-growth reactor.Water Sci Technol 29: 281 – 288 .Shin,H.S.,Lim,K.H.,andPark,H.S.1992.Effectofshearstressongranulationinoxygen aerobic upow sludge bed reactors. Water ... of aerobic granular sludge increased linearly with shear force in asequencingbatchbiolterreactor,andaveryhighbiomassdensityof70to110gVSS L–1biomass was obtained in the reactor (gure 2 .8) ....

... proteins (PN) of nitrify - ing granules. It is apparent that a short cycle time would stimulate the productionCycle Time (hours)123Integrity Coefficient (%) 80 82 84 86 88 9092FIGURE 3.11 IntegritycoefcientofsludgecultivatedinSBRsrunatdifferentcycletimes.(DatafromWang,F.etal.2005.World ... Properties of Aerobic Granules 413.4 Conclusions 49References 493.1 INTRODUCTIONItappearsfromtheprecedingchaptersthatanumberofoperatingparametersofa sequencing batch reactor (SBR) can in uence aerobic ... According to thethermodynamicstheory,anincreaseincellsurfacehydrophobicitywouldcauseacorresponding decrease in the excess Gibbs energy of the cell surface, which pro - motes cell-to-cell interaction...

... dischargepointwithinthegivensettlingtimeareretainedinthereactor;otherwise,theyaredischarged. This chapter aims to offer in- depth insights into the role of settling time in aerobic granulation in SBR. ... theeffectofsettlingtimeisstillneededinordertoobtainmoredetailedinformation.4.10 RATIONALE BEHIND SETTLING TIME-INITIATED AEROBIC GRANULATION Figure4.3showsthataerobicgranulesaredominantonlywhenthesettlingtimeisasshortas5minutes,andamixtureofaerobicgranulesandsuspendedsludgeisdevelopedatlongersettlingtimes.InSBR,ashortsettlingtimepreferentiallyselectsforthegrowthofgoodsettlingbacteria,andthesludgewithapoorsettle - abilityiswashedout.Obviously,theselectionofgoodsettlingsludgeiscrucialforInocReactor ... calcium in aerobic granulesmaynotbeaprerequisiteofmicrobialgranulation.InR1toR4,theVS/TSratioofaerobicgranulesdeclinedfrom 88% to53%whenthecalciumcontentinaerobicgranules increased from 20.4 to 187 .6...

... discussed in chapter 6.REFERENCESArrojo,B.,Mosquera-Corral,A.,Garrido,J.M.,andMendez,R.2004.Aerobicgranulationwith industrial wastewater in sequencing batch reactors. Water Res 38: 3 389 –3399.Giokas, ... successful aerobic granulation in SBR.As presented in the preceding chapters, aerobic granules can be simply distin - guished from bioocs by their large particle size. The mean size of aerobic gran - ules ... aerobic granulation in both small- and large-scale sequencing batch reactors (SBRs). This53671_C005.indd 69 10/29/07 7:15: 18 AM© 20 08 by Taylor & Francis Group, LLC© 20 08 by Taylor &...