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32720117ENVIRONMENTALSCIENCEVol．32No．7Jul．2011UCT11*11121.1001242.100038UCTCOD/NCOD/N、COD/PTN/P．．COD0.79～0.93kg/m3·d4COD43.7±8.35mg/L83.8±3.86%COD60.2%～76.2%．40%∶30%∶30%88.2%32.8%NH+4-NTN0.21±0.20mg/L7.90±1.27mg/L．32.6%～39.5%97.2%．COD/N4.64～7.41R2=0.96COD/PTN/P35.0～92.56.24～12.5R2=0.87R2=0.89．SVI82.6±4.99mL/g．UCTX703.1A0250-3301201107-2006-072010-08-292010-10-272008ZX07317-007-105PHR20090502ykj-2010-37381987～E-mailgl-222@tom．com*E-mailpyz@bjut．edu．cnOptimizationofaModifiedUCTStepFeedProcessTreatingMunicipalWastewaterGEShi-jian1PENGYong-zhen1CAOXu1WANGShu-ying1YANGAn-ming121.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineeringBeijingUniversityofTechnologyBeijing100124China2.BeijingDrainageGroupCo．Ltd．Beijing100038ChinaAbstractApilot-scalemodifiedUCTstepfeedprocesswasproposedtotreatthemunicipalwastewaterwithlowerCOD/Ninalarge-scalewastewatertreatmentplant．EffectsofinfluentdistributionratiosandnutrientsratiosCOD/N、COD/PandTN/Ponnutrientsremovalcapabilitieswereimportantlyinvestigated．Theremovalmechanismsoforganicsandnutrientsandsludgecharacteristicswereultimatelydiscussed．Accordingtothecontinuousexperimentsthestableandhighprocessperformancewasobtained．TheaverageCODremovalefficienciesandeffluentconcentrationof83.8±3.86%and43.7±8.35mg/LwereachievedintheinfluentCODloadingof0.79-0.93kg/m3·d．TheCODremovalinanaerobicandanoxiczonesaccountedfor60.2%-76.2%．Withtheinfluentdistributionratioof40%∶30%∶30%asmuchas88.2%ofTNremovalefficiencywasobserved．Itshouldbeconsideredtheremovalof32.8%throughsimultaneousnitrificationanddenitrificationprocess．TheaverageeffluentNH+4-NandTNwere0.21±0.20mg/Land7.90±1.27mg/Lrespectively．Itwasextremelyimportantthatasmuchas32.6%-39.5%ofthedenitrifyingphosphorusaccumulationorganismscontributedtothehighphosphorusremovalefficiencyof97.2%．AlinearpositiverelationshipwasobservedbetweennitrogenremovalefficiencyandCOD/Nintherangeof4.64and7.41R2=0.96．PhosphorusremovalefficiencywasfoundtobeafunctionoftheinfluentCOD/PandTN/Pvaryingfrom35.0to92.5andfrom6.24to12.5respectivelyR2=0.87andR2=0.89．InadditionthegreatsludgesettleabilitywasobtainedwiththemeanSVIof82.6±4.99mL/g．KeywordsstepfeedinflowdistributionratiosnitrogenandphosphorusremovalsimultaneousnitrificationanddenitrificationSNDdenitrifyingphosphorusremovalUniversityofCapeTownUCT．-．A/O、//A/A/OUCT12．COD/N．COD/N．DOI:10.13227/j.hjkx.2011.07.0327UCT3①②③．23．A/OA/O、4～8．．9．UCTCOD/N．UCT．11.1UCT1、．340L50cm×60cm×125cm13、．．50cm60°90cm88L、．、、．、．1.2.3.4.5.6.7.8.AN.DN.1UCTFig．1Schematicdiagramofpilot-scalemodifiedUCTstepfeedBNRprocess420%∶30%∶50%、30%∶40%∶30%、40%∶30%∶30%、50%∶30%∶20%43．、COD/NCOD/P4.63～7.4135.0～92.5.．1.2A/A/O．COD308±172mg/LTN52.9±17.1mg/LNH+4-N51.0±18.8mg/LNO－2-N0.07±0.32mg/LNO－3-N0.91±1.39mg/LPO3－4-P3.92±5.49mg/LTP6.43±6.22mg/L．15d．1.30.45μmNH+4-N、NO－2-N、NO－3-N、PO3－4-P、COD10WTWlevel-2pHpHWTWpH/oxi340i700232ORPDOMLSSMLVSS．1.4SNDSNDSND1～4．NSND=Ninfluent－Ndenitrification－Nassimilation－Neffluent1Ndenitrification=NDN1+NDN2+NDN32Nassimilation=MLSSwaste×fVSS/SS×Vwaste×fN/biomass3SNDefficiency=NSNDNinfluent×100%4NSND、NdenitrificationNassimilationSND、g/dNinfluentNeffluentg/dNDN1、NDN2NDN3g/dMLSSwasteg/Lfvss/ssMLVSSMLSSVwasteLfN/biomass12.39%11．22.1UCT．24COD．183.6～402.8mg/L43.7±8.35mg/L83.8±3.86%．COD．14COD76.2%、70.4%60.2%COD、COD/N．．24CODFig．2VariationprofilesofCODwithfourinfluentdistributionratios2.2．313．HRT12．30d50%HRT．230%0.09mg/L12.7mg/L．40%84.9%．450%．1314．Larrea7A/O40%∶40%∶20%～33%∶33%∶34%Vaiopoulou1460%∶25%∶15%．340%∶30%∶30%80027UCT34Fig．3Variationprofilesofnitrogenwithfourinfluentdistributionratios．、．A/O、A2/O．11ΔN．1～442．SND41.5、8.65、18.68.74g/d．40%∶30%∶30%SND32.8%88.2%．SND2①1Table1Effectofinflowdistributionratiosonthemodifiedstepfeedprocessperformance/%/mg·L－112311ΔPΔN22ΔN32ΔN20∶30∶5030∶40∶3040∶30∶3050∶30∶20COD269．786．561．538．259．940．862．949．048．9NH+4-N56．714．77．890．2119．00．7220．48．438．31NO－3-N0．221．054．038．034．393．7811．610．57．4313．16．3812．9NO－2-N0．020．020．330．030．000．000．080．0040．01PO3－4-P12．411．80．603．664．812．933．212．442．47COD289．5105．347．840．365．439．453．249．447．8NH+4-N49．919．312．80．4121．30．7513．60．000．00NO－3-N0．010．873．999．682．952．6411．311．912．4410．55．5910．2NO－2-N0．000．010．440．050．030．010．060．010．00PO3－4-P6．3621．0514．07．051．271．840．951．021．081．11COD289．0128．849．744．360．441．951．140．132．7NH+4-N55．626．819．50．6118．60．9213．10．000．00NO－3-N0．180．131．296．015．641．378．5810．741．566．688．166．53NO－2-N0．030．030．530．080．270．000．270．090．08PO3－4-P5．9829．79．3620．30．330．520．380．520．410．42COD287．6156．765．743．362．848．348．947．947．2NH+4-N54．3930．922．64．5223．32．039．430．010．00NO－3-N0．140．996．7517．67．819．3215．815．89．5516．02．9615．7NO－2-N0．310．020．610．031．260．250．390．400．35PO3－4-P5．5831．211．220．00．210．510．040．310．080．099002322UCTTable2NitrogenbalanceanalysesofthemodifiedUCTstepfeedprocess/%20∶30∶5030∶40∶3040∶30∶3050∶30∶20Ninfluent/g·d－157.850.856.756.0Nwaste/g·d－114.09.4912.711.7Ndenitrification/g·d－118.844.833.434.9Neffluent/g·d－121.610.46.7416.4NSND/g·d－111.58.6518.68.74SND/%20.017.032.815.6TN/%62.779.688.271.0MLVSS5500、47504100mg/LDO1.5～2.0mg/L0.05～0.8mg/