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2014,34(1)123~129ChinaEnvironmentalScienceA/O1*,2,2(1.,1500902.,150090),A/O(MAOP),(HRT)(R)COD.,,MAOPCOD,(SRT)18dHRT24h,300mg/L,GB89781996.4:3:2:1R100%HRT48hSRT18d,MAOP97.7%,3.6mg/L,GB89781996.MAOP,.A/OX731A10006923(2014)01012307Efficiencyofamulti-stageanoxic/oxicprocesstreatingtannerywastewaterfollowingabiochemicalpretreatment.LIJian-zheng1*,ZHAOBo-wei2,ZHAOZong-ting2(1.StateKeyLaboratoryofUrbanWaterResourceandEnvironment,HarbinInstituteofTechnology,Harbin150090,China2.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China).ChinaEnvironmentalScience,2014,34(1)123~129AbstractAmmonianitrogen(NH4+N)removalisnotsatisfactoryintheexistingtannerywastewatertreatmentprocesses.Inordertosolvetheproblem,amulti-stageanoxic/oxicprocess(MAOP)wasintroducedasasecondarybiologicaltreatmentunittotreattannerywastewaterdeeply.TheMAOPwasafour-stageanoxic/oxicprocessandtheinfluenceofstep-feeding,hydraulicretentiontime(HRT)andsludgereturnrate(R)onitssimultaneousremovalefficiencyofchemicaloxygendemand(COD)andNH+4Nwasinvestigated.TheresultsshowedthattheMAOPwaseffectiveinCODremoval.Whateverthestep-feedingwascarriedout,theeffluentCODwaslessthan300mg/LwithHRT24handsolidresidencetime(SRT)18d,cominguptothesecondaryemissionstandardsofGB89781996.WiththesameHRTandSRT,theNH4+Nremovalwasupto97.7%whentheinflowdistributionratioandRwere4:3:2:1and100%respectively.TheeffluentNH4+Nabout3.6mg/LmettheprimaryemissionstandardsofGB89781996.Amultiplemechanismofdenitrification,shortcutnitrification,simultaneousnitrificationanddenitrificationcouldbeoccurintheMAOP.ItwassuggestedthatMAOPwasapromisingbiologicaldenitrificationprocessfortannerywastewatertreatment.Keywordstannerywastewatermulti-stageanoxic/oxicprocessammoniaremovalnitrogenremoval,[12].,,[34].COD,(NH4+N).,,NH4+N1.49t/a6[5].GB354983GB897888,GB89781996NH4+N[6].NH4+N,.A/O20130510(2013ZX07201007);(51178136)*,,ljz6677@163.com12434,,,,,[79].,CODA/O,,A/O,[10].,;,COD,A/O,COD,NH4+N,.A/O,A/O,(HRT)(R)A/OCODNH4+N.11.1(1)A/O.,1000L100L.1234567891011121A/OFig.1Schematicdiagramofthefourstageanoxic/oxicprocess1.;2.;3.;4.;5.;6.;7.;8.;9.;10.;11.;12.A/OABS,L×B×H=3200×300×1200mm,1m3.1,,1:3,(A),(O).,(DO)0.3~0.5mg/L.,,,DO2~3mg/L.1,A/OA.1.2.,,1.1A/OTable1Influentwaterqualityofthefourstageanoxic/oxicprocesspHCOD(mg/L)NH4+N(mg/L)NO3N(mg/L)7.318621.10.48.71032227.330.17.9563112.56.61.3A/O,(MLSS)8000mg/L.625L4A/O,.,A/O,,1m,AO,,ADO0.3~0.5mg/L,ODO2.0~3.0mg/L.48h,,,,,.5(10d),NH4+N(NO3N)80%15mg/L,,5000mgMLSS/L.1.4A/O,A/O.,HRT1A/O125R,2.1.5pHDOCODNH4+NNO3N.DOThermoOrion3STAR(310D,),pHPHS3CpH(),[11].22.1COD2,A/O60d,HRTR,A.A/O,10d.,COD5d.5~11d,COD,CODCOD,223mg/L55.9%.[1213],RA/OMLSS35%~70%,AHRTCODCOD.A/OCOD,,R100%200%,HRT48h96h.(2),,A/OCOD222mg/L,COD50.1%.,,RHRT,COD.,A/O,RHRT50%24h(2).(2),,A/OCOD.19d,COD792mg/L,COD67.4%,COD254mg/L.RHRT100%48h(),COD353mg/L,COD44.9%,COD,189mg/L.2A/OTable2Operationphasesandthecontrolparametersofthefourstageanoxic/oxicprocess(d)1~1112~2936~5455~601:0:0:01:0:0:04:3:2:14:3:2:1COD(mg/L)186~632339~591545~1032298~446NH4+N(mg/L)81~15421~99105~197129~227R(%)10020050100HRT(h)48962448SRT(d)18181818DO(mg/L)2.0~3.02.0~3.02.0~3.02.0~3.0DO(mg/L)0.3~0.50.3~0.50.3~0.50.3~0.5:30~35d,010203040506070809002004006008001000120014001611162126313641465156(d)COD(mg/L)COD(%)2A/OCODFig.2CODremovalinthefourstageanoxic/oxicprocessA/OCOD,HRTR,163~360mg/LCOD.,,[1415].[15],COD200~300mg/L.,COD577mg/L,A/O230mg/L.,,COD.HRT48hSRT18dR100%4:3:2:1,A/O12634COD200mg/L,GB89781988.2.2NH4+N,NH4+N:,(NO2N)NO3N.,NH4+N.(),—0.2~0.4mg/L1.2~1.5mg/L[16].pH7.5~8.0[17].2,A/O,ODO2.0~3.0mg/L,DO,OpH7.38.5(,3).DOpH,NH4+N(4).6.06.57.07.58.08.59.09.51611162126313641465156(d)pH3A/OpHFig.3InfluentandeffluentpHofthefourstageanoxic/oxicprocess4,,,A/ONH4+N.,NH4+N126.4mg/L,117.5mg/L,7.0%.(23~29d),NH4+N25.5%,56.1mg/L,GB89781996.0501001502002501611162126313641465156(d)NH4+-N(mg/L)4A/ONH4+NFig.4InfluentandeffluentNH4+Nofthefourstageanoxic/oxicprocess,NH4+N.(42~54d),NH4+N149.1mg/L,83.9mg/L,44.1%.,RHRT100%48h(),NH4+N.,NH4+N173.4mg/L,NH4+N97.7%,NH4+N3.6mg/L,GB89781996.,A/ONH4+N.,A/O,,[18].,,,.,CODA/O,,,A/ONH4+N.A/O,NH4+N.,HRT,,NH4+N.SRT,R,NH4+N,NH4+N[9].1A/O1272.3NO3N5,,A/ONO3N1.7mg/L,,1.6mg/L.,NO3N16.6mg/L,7.0mg/L,10d82.5%,.,A/OHRT24hR50%,NO3N1.7mg/L,22.3mg/L,.HRTR48h100%,NO3N0.8mg/L,71.4mg/L.01020304050607080901001611162126313641465156(d)NO3--N(mg/L)5A/ONO3NFig.5InfluentandeffluentNO3Nofthefourstageanoxic/oxicprocess,A/OCOD,O,.HRT,.RA/O,NO3NA.,,AONO3N,,A.,A/O,.2.4NH4+N,NO3N(TN).,.,A/O[7,17,19].,A/O.,pH6.5,pH7.5,,NO2N,[1620].DO[17],,[1617].A/O,pH7.98.0(3),ADO0.3~0.5mg/L(2),,NO2N.,A/O,.,NO2NO4+N2.20~43pH6.7~8.3,[21].45,A/O,NH4+N,126.4,117.5mg/L,.,,NH4+N,NO3N82.5%,HRT96hR100%,A/O.,A/O,NH4+N44.1%,NO3N22.3mg/L.RHRT,NH4+N97.7%,12834NO3N71.4mg/L.,NH4+NNO3N,A/O48.6mg/LNO3N,NO3N20.6mg/L,20.0mg/L,99.2mg/L(3).3A/OTable3Nitrificationinthefourstageanoxic/oxicprocessNH4+N(mg/L)144.1173.4NH4+N(mg/L)95.53.6NH4+N(mg/L)48.6169.8NH4+NNO3N(mg/L)(A)48.6169.8NO3N(mg/L)1.70.8NO3N(mg/L)22.371.4NO3N(mg/L)(B)20.670.6NO3N(mg/L)(:AB)28.099.2,NH4+NNO3N.NH+4N:,