UASB处理低浓度城市生活污水的中试试验及动力学研究张青

The4thlnternatlona1ConfereneconW台tershedManagementandUrbanwatersuPPly助.丽山.nehlll.2翻4STUDYONAPILOTEXPERIMENTANDAKINETICPROCESSFORTREATMENTOFMUNICIPALWASTEWATERBYUASBSYSTEMZhangQing,LuoWensheng(StateKeyLaboartoryofWaterResoucresandHydorPowerEngineeirngScienee,WuhanUniversity,Wuhan,430072,China)ABsT以eT:Innueneeafetors,parametersandmodelofal.Zm3up一nowanaeorbiesludgeb一anket(uAsB)reaetorwerestudied,whiehwasoperatedatlowopeartingparametersofZoomgeooL1.Theseeond脚start一up,operationandkinetiesParametersofsubstratedegradationoftheUASBreaetorweredemonstrated.Thisreaetorwasstartedwithsludgeloadingrate(sLR)ofo.o6kgeonzkg一Ivssd一1ando电anic一oadingrate(oLR)2.4kgeoom一孑d一1.仆estart一up15eompletedbasieallywithin5dayswithgranularsludgeasseedattemPeratureabout201」.ThereactorwasoPeratedunderSLRfrom0.o25kgeookg一’vss·`’to0.lokgeookg一’vssd一’,oLRrromo.skgeoom一粤d一`to3.skgeoom子d`,liquid叩nowveloeityfrom一4to一7mh一1andhydraulieretentiontime(H盯)from3.ohto2.5hattem件ratureintherangefrom32to5{1,forsixmonths.TheCODremovaleiffeieneywasfrom40%to80%.ThesterngthoftheUASBreaetormustbemorethan一oomgeooL一I,otherwiseadensesludgebedeouldnotbeestablishedinthebottomofthereaetor.Thedee一ininggrowthrateeonstants(KZ)of6.oxlo一SL哩一IVSSd一I,5.oxlo一SL叹Ivssd’,2.lx一。`SLmglvssjlandZoxlo一SL叱Ivss·d一1wereobtainedbymodeorauattheaveargetemperatureof28.5·,一9.5[,l一,1and6{·,respeetively.天七夕wo几15:UASB:sewage:kinetiemodeUASB处理低浓度城市生活污水的中试试验及动力学研究张青,锥文生(武汉大学水资源与水电工程科学国家重点实验室武汉430072摘要:研究1.2m3厌氧反应器反应器,在自然温度(水温32℃一5℃)下处理COD浓度为ZOOmg·L’左右的低浓度生活污水,按UASB方式运行,其运行参数和基质降解动力学模型、实验采用颗粒污泥接种二次启动法,启动采用的污泥负荷(SL)R为O.06gkCOO·gk一’VSS·d`.容积负荷(0L)R为.24kgCOO·m一`·d一`,水温20℃时,sd后反应器即可完成启动、正常运行.水处理系统在水温32℃一5℃范围内运行6个月的时间.UASB反应器在上升流速为1.4m·h’一1.7m·卜’,水力停留时间川R丁)为3.0卜一2.5匕.SuR为0.O25kgC0o·kg一’vSS·d’一0.IOkgCOD·kg’vSS·d’时.去除效率比较稳定,COO去除率达40%一80%JUASB反应器处理低浓度城市污水的极限浓度是1OOCOOmg·L一’在平均温度为28.5OC、19.5℃、11℃和6℃时,Grau模式计算的减速增长速度常数K分别是6.0火10`〕L·mg一’VSS·d’,5.0火10马L·mg一’VSS·d`,2.1x10气L·mg’vSS·d’和2.Ox10`L.mg一’VSS·d一’关键词:USAB;城市污水;动力学模型1INTRODUCTIONAtthePresent,themostferquentlyusedsystemsfordomestiewastewatertreatmentinChina,includesaeorbicsystems(activatedsludgeandbiologiebioiflmsystems),anaerobiesystemsandstabilizationPonds.*CorresPondenee:ZhangQing,StateKeyLaboratoryofWaterResoureesandHydroPowerEngineeirngScienee,WuhanUniversity,Wuhan,ChinaE一mail:[e-mail]:[e-mail]1011AcomP硕sonbetweenaeorbicandanaerobicsystemseanbePersentedasfollows.Thecostsoftheanaeorbicsystemsaer3timessmaller山anaeorbies’whentheydealwiththesamewastewater11!.Theeostsofaerationandsludgehandling,thetwolagresteostsassoeiatedwithaeorbiesewageteratment,wouldbeerdueeddramatieallybecause(a)nooxygen15neededintheProeessand(b)thePorduetionqualityofsludge153to20timessma一er小an小atinaeorbieteratment12].仆edis“vant鳃eof山eanaeorbicsystem15thattheeraerhigherCODeoncentrationandlowerermovaleiffeiencyofniotrgenandPhosPhoursthanthatofaeorbicsystem.TheeffluentfromUASBeractorsusuallyneedsfuhrterteratment,inodrertoermoveermnantograniematter,nutirentsandPahtogens.5ineemuniciPalwastewater15ogranie,lowe-rstrengthandlower一temPeraturethanindustrialwastewater,theheteorotrPhiebiomassesgorwslowlyinwateroflowtemPeratureandlowconcentration,andtheeraetor,5st叭一uPmaytakelongeratlowertemPerature.50it15aehallengeforanaerobictechnologytoextentitsapPlieabilitytolower一setrnghtwastewater,i.e.,sewageanddomestiewastewater13].^dequatewastewaterteratmentsystemshasotbesimpleindesignandeiffeientinermovingthePollutants.TheinteerstonanaeorbiesystemsasthemianbiologiealstePinwastewaterwasseaereuntilthedevelopmentoftheup一flowanaeorbiesludgeblanket(uAsB)eraetorbyLettingaetaz.inthe1970515].ThesueeessofhteUASBconeePterliesontheestablishmentofadensesludgebedinthebottomofthereactor,inwhiehProcessestakePlaee.hTesesludgebed15basicallyfomredbyaccumulationofineomingsuspendedsolidsandbaeteiralgorwth.Sludgeloadingrate(sLR)15thekeyguidelineofuAsB16]。仆espeei6egravityofgranu一esludgearefrom一o6kg·m一3to1.gkg·m一3,thesedense铭gregateshavegoodsettlingPorPertiesandaernotsuseePtibletowash一outformhtesystemunderPraetiealreaetorconditions.ThegarnulehasbothsusepnsegorwthandaPopsitiongorwthsludgeeharacter.NatuarltuhtulencecausedbytheinfluentifowandthebiogasPorductionPorvidesgoodwastewater一biomasseontactandrapidmattertransferinUASBsystems.HigherorganieloedseanbeapPliedinUASBsystemsthaninaerobicProcesses171.50lesseraetorvo一umeandspaee15erquierdwhile,at小esametime,highgardeene嗯y15pordueedasbiogas.hTeUASBeoneePtwasasimPle,eomPaet,etehnologyforsewageteratment,evenaterlativelylowtempeartuer18一9].Theplantbuiltinealiisc一苗medtobethenrstoritskindintheworld1101.A麟m3eraetorwasopeartedatanaveargesewagetemePratureor25口.sewageinealiwas297mgeon·L一land95mgBon·L1.eoDandBooermova一emeieneiesweerform75%to52%andrrom75%to93%,representatively111].EnegryeonsumPtioninthesesystemsshouldbelow,reuseofwaterandvaluableby一Productsmustbemaximized,andtheuseofsoPhistieatedequiPmentmustbekePttoaminimum.ThesefeatuersaererquiredbothinthedeveloPingworldandinindustiralizedcountires,whereinvestmentcostsandenegryeonsumptionhavetobeerdueed,whilethetreatmenteiffe