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154No.4Vol.1520018JournalofChemicalEngineeringofChineseUniversitiesAug.2001:1003-9015(2001)04-0346-05pH/1,2(1.,310029;2.,310013):SBR/PH(FA)(FNA)PHIIIIIIpH6.88.28.2IIIIIIpH7.58.28.2:/pHSBRX792.031A1NO2--NNH4+-NAnthonison[1](FA)(FNA)FAFNANH3+H2=NH4++OH-HNO2=H++NO2-pHFAFNA(1)(2)pHwbpH410/10]NNH[1417FA+×-×=+KK(1)pHa210]NNO[1446FNA×-×=-K(2)Amthonision10mg⋅L-1~150mg⋅L-10.1mg⋅L-1~1.0mg⋅L-10.22mg⋅L-1~2.8mg⋅L-1Wong-chongG.M[2]40mg⋅L-1SBR(SequencingBatchReactor)NNH4+NO2-NNNN[3,4]1.NN25%2.60%CC/N2.86:11.71:1C/N3.N22.1,CODcr35000mg⋅L-12000-04-18;2001-03-06(1945-)154pH/347~65000mg⋅L-1(PAS)CODcr20000mg⋅L-1~30000mg⋅L-1,NH4+-N5000mg⋅L-1~6000mg⋅L-1,SBR,CODcr5000mg⋅L-1~6000mg⋅L-1,NH4+-N1200mg⋅L-1~1300mg⋅L-12.2SBR20L14L(DKY-OIS)()73121pHSBRpHpH(6.87.58.28.8)20L4(5L3.5L)10%HCl10%NaOH20%NaHCO3pHpHNSBRpHHClNaOHNaHCO3pH0.22.3SBRSBRSBRSBRISBRIISBRISBRISBRIISBR8L14L22h0.5h8L5.5h2.4[5]CODcr:MLSS:NO3--N:SS:NO2--N:α-DO:pH:pHs-WNH4+-N:350,25%~30%75%,;,SBRSBRI7,/I;SBRII/IIIIISBR,CODcr94%~96%NH4+-N80%~90%pH1SBRFig.1DiagramofSBRexperimentalprocess1.SBRreactor2.stirrer3.airreleaser4.aircompressorTimer12342SBRA/OFig.2TimesettinginreactionstageSBRISBRII0hr12hr16hr16hr12hr8hr4hr0hrstiraeration348200183.1pHCpH(6.87.58.28.8)CCODcrNO2--NNH4+-N3453pHCODcrpH4NO2--N,6hrNO2--N6hrpH6.87.5NO2--N7hrNO2--N15mg⋅L-1C5CpHPHNH4+-NNH4+-NNH4+-NNH4+-N~t3.2pHIIIIIIpHNO2--N678pH1678pHpH6IpH8.2~8.84hrNO2--NpH6.8,NO2--NpH7.5,6.8II,pH6.8NO2--NpH8.2,NO2--N,IIIII100015002000250030003500400001234567Time,hrpH6.8pH7.5pH8.2pH8.8CODcr,mg⋅L-13pHCODcrFig.3CODcrprofilesofcarbonoxygenizementstagewithpHvaluecontrolledatdifferentlevel0510152001234567Time,hrpH6.8pH7.5pH8.2pH8.8NO2--N,mg⋅L-14pHFig.4NitriteprofilesofcarbonoxygenizementstagewithpHvaluecontrolledatdifferentlevel8009001000110012001300140001234567Time,hrpH6.8pH7.5pH8.2pH8.8NH4+-N,mg⋅L-15pHFig.5AmmonianprofilesofcarbonoxygenizementstagewithpHvaluecontrolledatdifferentlevel154pH/3491pHTable1NitrosationrateofthreenitrosationprocessatdifferentpHvalue,unit:mgNO2--N×(gMLSS×h)-1NitrosationprocessstageINitrosationprocessstageIINitrosationprocessstageIIIpHvalueNitrosationratenMean-squaredeviationNitrosationratenMean-squaredeviationNitrosationratenMean-squaredeviation6.83.5350.2440.17820.1310.11020.0147.52.9830.1316.9320.2205.1730.4318.20208.1750.8927.2360.7748.80205.0820.2474.0120.5951,I,pH6.8,3.53mgNO2--N⋅(gMLSS⋅h)-1,pH7.52.98mgNO2--N⋅(gMLSS⋅h)-1pH8.2~8.8IIIIIpH8.2,pH6.8,0.1mgNO2--N⋅(gMLSS⋅h)-1IIIIIpH7.2mgNO2--N⋅(gMLSS⋅h)-1~8.2mgNO2--N⋅(gMLSS⋅h)-11pHSBRI,pH8.2~8.8SBRII,pH6.80.1mgNO2--N⋅(gMLSS⋅h)-1,I3.0~3.5mgNO2--N⋅(gMLSS⋅h)-1pH6.8~8.83.3pHpHNO2--N91011pH22pHTable2DenitrosationrateofthreedenitrosationprocessatdifferentpHvalue,unit:mgNO2--N×(gMLSS×h)-1DenitrosationprocessstageIDenitrosationprocessstageIIDenitrosationprocessstageIIIpHvalueDenitrosationratenMean-squaredeviationDenitrosationratenMean-squaredeviationDenitrosationratenMean-squaredeviation6.82.5120.3112.0120.1240.9320.0437.54.2050.5123.8920.5221.4720.2258.202010.430.9312.2730.6358.80206.3120.4721.8620.297910112pHpH;SBRII,pH7.5,pH8.2~8.8SBRII,IIIII,pH8.2pH8.2,II10.4mgNO2--N⋅(gMLSS⋅h)-1,III2.27mgNO2--N⋅(gMLSS⋅h)-135020018,,,,41.pHpH(FA)/2.IIIIIIpH6.88.28.2,4.20mgNO2--N⋅(gMLSS⋅h)-110.4mgNO2--N⋅(gMLSS⋅h)-12.27mgNO2--N⋅(gMLSS⋅h)-1IIIIIIpH7.58.88.83.53mgNO2--N⋅(gMLSS⋅h)-18.17mgNO2--N⋅(gMLSS⋅h)-17.23mgNO2--N⋅(gMLSS⋅h)-1Ka─HNO2Kw─Kb─[1]AnthonisenACetal.Inhibitionofnitrificationbyammoniaandnitrousacid[J].JWPCF,1976,48(5):835~852.[2]Wong-chongGM,LoehrRC.Kineticsofmicrobialnitrification:nitrite-nitrogenoxidation[J].WatRes,1978,12(8):605~609.[3]MurrayI.etal.Inter-relationshipsbetweennitrogenbalance,pHanddissolvedoxygeninanoxidationditchtreatingfarmanimalwaste[J].WatRes,1975,9(1):25~30.[4]PrakasamTB,LoehrRC.Microbialnitrificationanddenitrificationinconcentratedwastes[J].WatRes,1972,6:859~869.[5]NantionalEnvironmentalProtectionAgency().MonitoringandAnalysisMethodofWaterandWastewater()[M].Beijing():ChinaEnvironmentalPress(),1989.EffectofpHValueonNitrosation/DenitrosationRateforWastewaterContainingHighAmmoniaNitrogenFANGShi1,LIXiao-huan2(1.DeptmemtofEnvironmentalEngineering,ZhengjiangUniversity,Hangzhou310029,China;2.MetallurgicalEnvironmentalProtectionInstituteofZhejiangProvince,Hangzhou310013,China)Abstract:ItwasprovedthatthedenitrificationprocessofN-richMGwastewatertreatmentusingtwo-stageSBRwascomposedbyacarbonoxygenationprocessandthreestagesnitrosation/denitrosationprocess.ThepHlevelcorrelatedwiththefreeammonia(FA)andfreenitrousacid(FNA)wastheprimaryfactorforthedenitrificationprocess.TodeterminetheoptimumpHlevelforeachprocessorstage,fourpHvalueswereselected,whichwere6.80.2,7.50.2,8.20.2and8.80.2.Experimentsshowedthatduringthecarbonoxygenationstage,thehigherthepHvalue,thebatterthestrippingeffect,andduringthethreestagesofnitrosationprocessI,IIandIII,theoptimurmpHvalueswere6.8,8.2and8.2respecticely,whilethenitrosationratesforthethreenitrosationstageI,IIandIIIwere4.2,10.4and2.27mgNO2--N⋅(gMLSS⋅h)-1respectively.ForthethreestagesofthedinitrosationprocessI,IIandIII,theoptimumpHvalueswe