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C/N12321．1500502．1500903．510060C/N＜3、NO－x－N。NO－x－NCODTNSNDTN。75%COD、、TN46．35、0．23、16．721．45mg/L。X703A1000－4602201519－0048－0551208185QC2011C0181251G053E－mailpyz@bjut．edu．cnOptimizationofInnerCycleＲatioinModifiedStepFeedProcessinTreatingMunicipalSewagewithLowC/NＲatioWANGWei1CHENQiang2WANGChuan-xin3PENGYong-zhen21．CollegeofCivilandArchitecturalEngineeringHeilongjiangInstituteofTechnologyHarbin150050China2．StateKeyLaboratoryofUrbanWaterＲesourceandEnvironmentHarbinInstituteofTechnologyHarbin150090China3．GuangzhouMunicipalEngineeringDesignandＲesearchInstituteGuangzhou510060ChinaAbstractThemodifiedstepfeedprocesswasusedtotreatmunicipalsewagewithlowC/Nratiooflessthan3andtheinfluenceoftheinnercycleratioonMLSSdistributionthenitratenitrogenconcen-trationinanaerobiczoneandremovaleffectofpollutantswasinvestigated．TheactualdataandresultsofmaterialbalancecalculationbasedontheactualdatawereanalyzedandtheresultsshowedthattheMLSSconcentrationintheanaerobiczoneincreasedwiththeincreaseoftheinnercycleratiobuttheni-tratenitrogenconcentrationintheanaerobiczonehadanincreasingtrendtoo．ThechangeofinnercycleratiohadlittleimpactontheremovalofCODandTNbuttheremovalrateofTNhadimportantrelation-shipwithSNDandmicrobialassimilationeffect．Theremovalrateofphosphatedecreasedwiththein-creasingofinnercycleratioduetotheweakenedphosphorusreleaseeffectbythephosphorus-accumula-tingbacteriaintheanaerobiczone．Consideringtheremovaleffectofnitrogenandphosphorustheopti-·84·3119201510CHINAWATEＲ＆WASTEWATEＲVol．31No．19Oct．2015malinnercycleratiowas75%andtheeffluentconcentrationsofCODammonianitrogenTNandphosphatewere46．35mg/L0．23mg/L16．72mg/Land1．45mg/Lrespectively．KeywordsstepfeedinnercycleratiolowC/NrationitrogenandphosphorusremovalC/NC/N。HＲT、MLSS、12。34。C/N。。、1NO－x－N1。C/N。11.11、。300L。100L67L。44L。、。。。Q1Q2Q31Fig．1Schematicdiagramofmodifiedstepfeedprocess1.215d。1。C/N2．20～4．222．98。1Tab．1Municipalsewagequalitymg·L－1COD94．69～243．20177．03NH+4－N30．74～57．6548．81NO－2－N0．053～0．4860．100NO－3－N0～0．9400．240TN31．99～70．8559．89PO3－4－P1．959～6．0584．131.3N－1－－TOC－VCPNCOD5B－3CMLSSMLVSSDOWTWmulti3420。1.422～26℃HＲT10hQ161L/dSＲT10～15dDO2mg/LDO0．1mg/L。74∶3∶3∶3∶3∶3∶3、236∶3∶142。2Tab．2Operationconditionsandparameters/%HＲT/hAHＲT/hHＲT/hＲun1252．1002．0852．1984．1856．383Ｒun2501．6191．9992．1983．6185．816Ｒun3751．3181．9312．1983．2495．447Ｒun41001．1111．8772．1982．9885．186·94·．watergasheat．comC/N311922.1COD4COD45．69、45．61、46．3545．98mg/L73．84%、71．09%、73．41%74．83%。CODCOD。4COD2。８０７０ＣＯＤ/(mg·L-1)ANRun１Run２Run３Run４A1O1A2O2A3O3６０５０４０３０2CODFig．2AlongvariationlawofCODunderdifferentconditions2COD、。1、242COD1COD32COD1COD21NO－x－N2COD12COD1COD。3COD2。2.24、3。40．76、1．19、1．452．43mg/L81．5%、71．3%、64．5%40．5%。NO－x－N1NO－x－N0．032g/d25%NO－x－N①C/NNO－x－N②11505mg/L35．6%。NO－x－N、25%100%50%、75%100%NO－x－N0．066、0．1290．132g/dNO－x－N。t/d150PO4-P/(mg·L-1)3-603012963090120150100500-50-100-150-200Run1Run2Run3Run4/%3PO3－4－PFig．3PO3－4－Premovalefficiencyofsystemunderdifferentconditions①1NO－x－N②2～41874、22832518mg/L43．6%、52．3%62．8%③。3NO－x－NNO－x－N1NO－x－NNO－x－N142．47、1．79、1．521．35。。1。44。·05·3119．watergasheat．com11/。121086420PO4-P/(mg·L-1)3-INFRun１Run２Run３Run４A1O1A2O2A3O3AN4Fig．4AlongvariationlawofPO3－4－Punderdifferentconditions2.32.3.140．39、0．14、0．230．04mg/L99．3%、99．7%、99．6%99．9%。1、2、3HＲT0．833、0．701、0．664h。45。4123。1～4。121086420NH4-N/(mg·L-1)+ANRun１Run２Run３Run４A1O1A2O2A3O35NH+4－NFig．5AlongvariationlawofNH+4－Nunderdifferentconditions2.3.243。34Tab．3Ｒesultsofnitrogenelementmaterialbalanceunderdifferentcondition*SNDＲun1/g·d－110．3832．1592．1253．6092．9171．698/%20．820．534．828．116．4Ｒun2/g·d－110．1572．9182．8732．7342．9021．603/%28．728．326．928．615．8Ｒun3/g·d－110．3832．3252．2923．3022．6612．095/%100．022．422．131．825．620．2Ｒun4/g·d－19．3682．9412．7541．5613．3181．548/%100．031．429．416．735．416．5*、。4TN20．8%、28．7%、22．4%31．4%。3①1NO－x－NNO－x－N②③AHＲTAHＲT。1AHＲT25%NO－x－N4AHＲT100%232AHＲT3。4SND。、5SND·15·．watergasheat．comC/N3119、DO、pH、、、6SND。4SND①DODODO。②。44。2.3.3TN4TN18．63、18．34、16．7217．47mg/L71．2%、66．3%、74．2%68．4%。TNC/N、、、、SND4TN3TN33TN。2.443SVI71．4、64．3、66．560．1mL/g。。7。DO+/。3①CODCOD50mg/LCOD。②TN3TN。③1。④375%COD、、TN46．35、0．23、16．721．45mg/L。⑤+/43SVI100mL/g。1PengYZGeSJ．EnhancednutrientremovalinthreetypesofstepfeedingprocessfrommunicipalwastewaterJ．BioresourTechnol2011102116405－6413．2ZhuGBPengYZZhaiLMetal．Performanceandop-timizationofbiologicalnitrogenremovalprocessenhancedbyanoxic/oxicstepfeedingJ．BiochemEngJ2009433280－287．3．//A2/OJ．2014301310－14．4LarreaLLarreaAAyesaEetal．Developmentandveri-ficationofdesignandoperationcriteriaforthestepfeedprocesswithnitrogenremovalJ．WaterSciTechnol2001431261－268．5．A2/OC/ND．2013．6．SBＲJ．201143855－60．7．SBＲJ．201531516－21．1979－。E－mailwang_weibjut@163．com2015－05－20·25·3119．watergasheat．com