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C/N12321．1500502．1500903．510060C/N、SND。0．20、0．16、0．10、0．06m3/h4COD0．06m3/h3DO1．38mg/LCOD50mg/LDODOSNDTN。0．10m3/h3DO2．32mg/L。X703A1000－4602201517－0035－0551208185QC2011C0181251G053OptimizationControlofAerationＲateinModifiedStepFeedProcessforTreatingMunicipalSewagewithLowC/NWANGWei1CHENQiang2WANGChuan-xin3PENGYong-zhen21．CollegeofCivilandArchitecturalEngineeringHeilongjiangInstituteofTechnologyHarbin150050China2．StateKeyLaboratoryofUrbanWaterＲesourceandEnvironmentHarbinInstituteofTechnologyHarbin150090China3．GuangzhouMunicipalEngineeringDesignandＲesearchInstituteGuangzhou510060ChinaAbstractThemodifiedstepfeedprocesswasusedtotreatthemunicipalsewagewithlowC/NandtheeffectofdifferentaerationratesonpollutantsremovalefficiencySNDrateandsettleabilityofsludgewereanalyzedthroughsmall-scaletestsandmaterialbalancecalculation．Theaerationratesoffourgroupsweresetas0．20m3/h0．16m3/h0．10m3/hand0．06m3/hrespectively．TheresultsshowedthattheCODremovalefficiencywaslittleaffectedbyaerationrate．Whentheaerationrateinaerobiczonewasaslowas0．06m3/htheaverageconcentrationofDOinrelevantaerobiczone3was1．38mg/LandtheeffluentCODconcentrationwasbelow50mg/L．Nitrificationwasgreatlyaffectedbyaerationrateanditwasobviouslydeterioratedwiththedecreaseofaerationrate．Theremovalefficiencyofphos-·53·311720159CHINAWATEＲ＆WASTEWATEＲVol．31No．17Sep．2015phorusreducedwhetherathighorlowaerationratesbecauseanaerobicphosphorusreleaseeffectwasweakened．NomatterathighorlowDOconcentrationthesettleabilityofsludgewasnegativelyaffected．Throughthematerialbalancecalculationitwasfoundthatthereductionofnitrificationefficiencyledtoanobviousdecreaseindenitrificationefficiency．MoreoverSNDrateandmicrobeassimilationhadim-portanteffectonTNremoval．Withacomprehensiveconsiderationoftreatmentefficiencyandenergycon-sumptiontheoptimizedaerationrateis0．10m3/handtheaverageDOconcentrationinaerobiczone3is2．32mg/L．Keywordsstepfeedaerationratepollutantsremovalsludgesettleabilityenergycon-sumptionC/NC/N1。HＲT、MLSS、2～4。。50%DO。DO、5～8。DO8。C/N。11.11、。300L。100L67L7AN、1A1、1O1、2A2、2O2、3A3、3O3。44L。、。DODO。1232288124AN4A1O15A2O25A3O357791110233244１.2.3.4.5.6.7.8.9.10.11.61Fig．1Schematicdiagramofmodifiedstepfeedprocess1.215d。1。C/N2．72～3．493．15。1Tab．1Ｒawwastewaterqualitymg·L－1CODNH+4－NNO－2－NNO－3－NTNPO3－4－P164．5～264．550．6～64．50～0．0090～0．97755．66～75．984．21～6．25206．256．60．0040．4965．295．361.3N－1－－TOC－VCPNCOD5B－3CMLSSMLVSSDOWTWmulti3420。·63·3117．watergasheat．com1.422～26℃HＲT10hQ161L/dSＲT10～15d。74∶3∶3∶3∶3∶3∶3AN、A2A36∶3∶1175%。O1、O2O31～40．20、0．16、0．10、0．06m3/h4DO2。2DOTab．2Operationconditionsandparametersmg·L－1ANA1O1A2O2A3O310．010．014．280．014．670．035．6020．010．013．480．014．070．024．7330．010．011．250．011．650．012．3240．010．010．690．010．850．011．3822.1COD4COD46．21、46．11、46．0749．02mg/L76．86%、76．91%、77．82%76．42%。COD。4CODCODCOD55．9%、57．3%、60．1%62．7%Ge962±6%UCT45．6%10。COD4。2.22.2.140．45、0．52、1．494．72mg/L99．2%、99．1%、97．4%91．8%。1～45．00mg/L。DO2．00mg/L11。21、22．00mg/L31、231．25、1．65、2．32mg/LDOA。430．69、0．851．38mg/L3A。42。3、41、23。1、2DO。302520150NH4-N/(mg·Ｌ－１)＋ANＡ1O1A2O2A3O3１２３４1052NH+4－NFig．2VariationofNH+4－Nconcentrationunderdifferentconditions2.2.243。34Tab．3ＲesultsofnitrogenelementmaterialbalanceunderdifferentconditionsSND1/g·d－12．3844．7152．7892．166/%19．839．123．118．02/g·d－12．3435．1242．6471．940/%19．442．522．016．13/g·d－12．9354．5332．5282．069/%24．337．621．017．14/g·d－12．6484．7092．6072．101/%21．939．021．617．434·73·．watergasheat．comC/N3117TN19．8%、19．4%、24．3%21．9%。12。344。3。1～4SNDSND124SND。。2.2.3TN4TN17．37、16．74、15．8316．49mg/L73．6%、74．6%、75．3%74．3%。TNC/N、、、、SND。4TNTN、3。2.343。1614121086420PO4-P/(mg·Ｌ－１)３－ＩＮＦＡＮＡ1O1A2O2A3O3１２３４3Fig．3VariationofPO3－4－Pconcentrationunderdifferentconditions41．85、1．68、1．481．80mg/L64．5%、67．7%、72．8%66．8%。4AN132．5%、171．8%、174．0%160．0%。1①1O1A1A1ANAN②PHA、。4PHAANVFAPHA。。3。343SVI。SVI160．4、148．5、100．1148．6mL/g。。1、2COD58。。313。4DO。4①CODDOCOD。②3DO1．5mg/L·83·3117．watergasheat．comA。TNSNDTN。③。④。⑤、430．10m3/hDO1．25、1．652．32mg/L。C/N3．15COD、、TN46．07、1．49、15．831．48mg/L77．82%、97．4%、75．3%72．8%。1．J．2009353102－106．2CaoGWangSPengYetal．Biologicalnutrientremov-albyapplyingmodifiedfourstep-feedtechnologytotreatweakwastewaterJ．BioresourTechnol2013128604－611．3PengYGeS．EnhancednutrientremovalinthreetypesofstepfeedingprocessfrommunicipalwastewaterJ．BioresourTechnol2011102116405－6413．4ZhuGPengYZhaiLetal．Performanceandoptimiza-tionofbiologicalnitrogenremovalprocessenhancedbyanoxic/oxicstepfeedingJ．BiochemEngJ2009433280－287．5．DOJ．201143442－46．6．A2/OJ．20122835－9．7．A2/OJ．2012351103－106．8．J．201127171－5．9GeSPengYWangSetal．EnhancednutrientremovalinamodifiedstepfeedprocesstreatingmunicipalwastewaterwithdifferentinflowdistributionratiosandnutrientratiosJ．BioresourTechnol2010101239012－9019．10．UCTJ．20106141009－1017．11．J．2006263293－297．12JooHHiraiMShodaM．PiggerywastewatertreatmentusingAlcaligenesfaecalisstrainNo．4withheterotrophicnitrificationandaerobicdenitrificationJ．WaterＲes200640163029－3036．13SchulerAJJangH．Causesofvariablebiomassdensityanditseffectsonsettleabilityinfull-scalebiologicalwastewatertreatmentsystemsJ．EnvironSciTechnol20074151675－1681．1979－。