pH对厨余废物两相厌氧消化中水解和酸化过程的影响

,,,.pH[J].,2005,25(5):665-669ZHANGBo,SHIHongzuan,ZHANGLili,etal.TheinfluenceofpHonhydrolysisandacidogenesisofkitchenwastesintwo2phaseanaerobicdigestion[J].ActaScientiaeCircumstantiae,2005,25(5):665-669pH,,,3,200240:2004208230:2004212223:2004212230:pH,4pH(pH=5,7,9,11)(VFA).,pH7,,TOCCODCODTOC9d86%82%,VFA4d36gL-1,VFApH2.pH7,,VFA,.pH7,,.:;;;pH;:025322468(2005)0520665205:X705:ATheinfluenceofpHonhydrolysisandacidogenesisofkitchenwastesintwo2phaseanaerobicdigestionZHANGBo,SHIHongzuan,ZHANGLili,CAIWeimin3SchoolofEnvironmentalScience&Engineering,ShanghaiJiaotongUniversity,Shanghai200240Received30August2004;receivedinrevisedform23December2004;accepted30December2004Abstract:BatchexperimentswerecarriedouttodeterminetheeffectofpHonhydrolysisandacidogenesisofkitchenwastesinthetwo2phaseanaerobicdigestion.ThesolubilizationrateandVFAproductionrateofkitchenwasteswithcontrolled2pHat5,7,9and11werefirstlyevaluated.TheconstituentsofindividualorganicacidsandthedistributionofthefeedingCODoverthedifferentdigestionproductsatvariouspHlevelsweresubsequentlyinvestigated.Theresultsshowedthathigherhydrolysisandacidogenesisrateswereobtained,whenthepHvaluewaskeptat7.Andabout86%ofTOCand82%ofCODweresolubilizedafter9daysandthemaximumVFAconcentrationof36gL-1wasachievedontheforthday.WhenthepHvaluewaskeptat7,lacticacidconcentrationwasrelativelylow,andaceticandbutyricacidwerepredominantVFA,whilepropionicacidtookarelativelylittlepart.ControllingpHat7increasedthehydrolysisandacidogenesisratesofkitchenwastesandprovidedthesubstratesfavorabletothesubsequentmethanogenesis,resultingintheoptimizationofthewholetwo2phaseanaerobicdigestion.Keywords:anaerobic;hydrolysis;acidogenesis;pH;kitchenwastes:(1977),,,E2mail:[e-mail];3()Biography:ZHANGBo(1976),Female,Ph.D.Candidate,E-mail:[e-mail];3Correspondingauthor,(VFA).,[1].,,UASB,[24].,,,[56].Sun2Kee[78]HRT,;Xu[9].,pH.,[10],pH25520055ActaScientiaeCircumstantiaeVol.25,No.5May,2005,pH.,,pH.1111..4,1.(VS)(TS),9619%;(SS)TS,7414%.CNP10020111,.1,1213%,2411%16%[()()].1Table1SamplingcharacteristicsofkitchenwastesPmm2NH+42NP(mgL-1)10TS12.9%TPP(mgL-1)182.51VS12.5%PP(mgL-1)172.47SS9.6%P(mgL-1)104.8VSS9.4%CNP10020.11pH3.916.1%VFAP(gL-1)3.6P(gL-1)2.55TOC46.8%69.3%TOCP(gL-1)11.83P(gL-1)21.56CODP(gL-1)166.510.6%CODP(gL-1)53.18P(gL-1)2.19P(gL-1)3.33:TOC112(35).300mL500mL,..12h5molL-1NaOHpH.pH.VFA,TOCCOD,TS,VS,SS,(VSS),,.CODVFA5%,.113pH,TS,VS,SS,VSS,COD,NH+42NTP[11].TOC,,,,105multiNPC3000()TOC.(KN)(BBCHI,DigestionUnitK2424;BBCHI,distillationUnitB2324).C18(2010A).H2CO2CH4TDX102GC214B.COD,TOC,TPKN,10000rmin-1,.21,,7dpH,7dpH.pH,pH3.1pHpHFig.1pHinthereactorsbeforepHwasintermittentlyadjusted9d.2pH.pH,pH.pH7,TOCCOD(CODCOD)86%82%.3pH.3,pH,,pH.4pHVFA666252pHFig.2TheeffectofpHonthehydrolysisrateofkitchenwastes3pHFig.3TheeffectofpHonthehydrolysisrateofdifferentconstituentscontainedinthekitchenwastes4pHFig.4TheeffectofpHontheacidogenesisrateofkitchenwastes.VFA,7d,pHVFA,.pHVFA,pH5,7,911,VFApHVFA.pH7,VFA4d,pH5,9,11,VFA7d.2VFA.VFAVFA.2,pH,.pH7,pH.pHVFA.pH57,VFA,pH7pH5;pH911,;pH,pH,VFA.2pHTable2TheindividualVFAconstituentsandlacticacidconcentrationatdifferentpHlevelspHVFAP(gL-1)P(gL-1)56.5%3.9%17.6%71.9%25.714.972.4%21.9%2.3%73.4%36.08.7924.7%45.6%4.5%25.2%24.315.31130.8%46.5%5.8%16.9%28.520.5pH,COD(5),,VFA.pH7,58%(COD),,VFA10%.5pHFig.5TheeffectofpHonthedistributionofthehydrolysis2acidogenesisproducts33.1pHpH,pH7,7665.pH(,TOCCOD86%82%)..pH7,VFApH.,VFA20gL-1[1,2,7,1215],pH7,VFA36gL-1,VFATS27%,pHVFA(15%)2.,[16],,[17].,,.,.,,[18].Wang[19,20],..Fu[21],pH56.pH7,.VFAHoriuchi[22].,VFA,.,pH7,,VFA,,pH,.,CPN[NaOHCa(OH)2]pH,pH[23].3.2pH,pH7VFA,,VFA.,,.,VFA,,VFA.41),pH7.pH7,,TOCCOD86%82%,4dVFA(36gL-1).,,VFA,pH,.2),.:(1946),,,.1970(),1983(),2000:,,,,(References):[1]ChoJK,ParkSC.BiochemicalmethanepotentialandsolidstateanaerobicdigestionofKoreafoodwastes[J].BioresourTechnol,1995,52:245253[2]WangJY,XuHL,TayJH.Semi2continuousanaerobicdigestionofwasteusingahybridanaerobicsolid2liquidbioreactor[J].WaterSciTechnol,2003,48:169174[3]HanSK,ShinHS,SongYC,etal.Novelanaerobicprocessfortherecoveryofmethaneandcompostfromfoodwaste[J].WaterSciTechnol,2002,45:313319[4]WangJY,XuHL,TayJH.Ahybridtwo2phasesystemforanaerobicdigestionoffoodwaste[J].WaterSciTechnol,2002,45:159165[5]HenzeM,MladenovskiC.Hydrolysisofparticularsubstratebyactivatedsludgeunderaerobic,anoxicandanaerobicconditions[J].WaterRes,1991,25:6164[6]VeekenA,HamelersB.Effectofsubstrate2seedmixingandleachaterecirculationonsolidstatedigestionofbiowaste[J].WaterSciTechnol,2000,41:255262[7]HanSK,ShinHS.Enhancedacidogenicfermentationoffoodwasteinacontinuous2flowreactor[J].WasteManageRes,2002,20:110118[8]RajeshwariKV,LataK,PantDC,etal.AnovelprocessusingenhancedacidificationandaUASBreactorforbiomethanationofvegetablemarketwaste[J].WasteManageRes,2001,19:292300[9]XuHL,WangJY,ZhangH,etal.Acomparativestudyofanaerobicdigestionoffoodwasteinasinglepass,aleachaterecycle86625andcoupledsolidPliquidreactors[J].WaterSciTechnol,2002,47:319324[10]YuHQ,FangHHP.Acidogenesisofgeltin2richwastewaterinanupflowana