CAST工艺高温短程硝化的实现及其除磷性能马娟

Eco-EnvironmentalKnowledgeWebEnvironmentalScience40320193Vol．40No．3Mar．2019CAST12111121．7300702．73007022、25、28℃3CAST．TN80%NH+4-N．22℃25℃94.3%86.9%28℃87.2%．28℃、22℃25℃/CODP/C．68.9%CASTTNNO－2．O2、NO－3、NO－2NO－3NO－2O2NO－3．CASTX703.1A0250-3301201903-1375-07DOI10．13227/j．hjkx．2018082542018-08-292018-09-12516680331978～[e-mail]-cutNitrificationinaCASTProcessatHighTemperatureandItsPhosphorusＲemovalPerformanceMAJuan12YANGＲui-chun1YUXiao-jun1ZHOUMeng1CHENYong-zhi121．SchoolofEnvironmentalandMunicipalEngineeringLanzhouJiaotongUniversityLanzhou730070China2．SewageTreatmentIndustryTechnicalCenterofGansuProvinceLanzhou730070ChinaAbstractAsyntheticwastewaterwasemployedtoinvestigatetherealizationofshort-cutnitrificationanditsphosphorusremovalperformanceinaCASTreactoroperatedat22℃25℃and28℃．TheresultsshowedthatTNremovalofthesystemwasstableandhigherthan80%atdifferenttemperaturesandNH+4-Nremovalperformedwell．Whenthetemperaturewasat22℃and25℃nitriteaccumulationwasnotobservedinthesystemandthephosphorusremovalratewere94.3%and86.9%respectively．Whenthetemperaturewasincreasedto28℃nitriteaccumulationefficiencyinthereactorreached87.2%implyingthesystemachievedastableshort-cutnitrification．Inadditionintheshort-cutnitrificationstageathightemperature28℃thephosphorusreleaseanduptakecapacityofthesystemdecreased．Theanaerobicphosphorusrelease/CODconsumptionP/Cratiowasmuchlowercomparedthoseat22℃and25℃．Howeverthephosphorusremovalperformanceofthereactordidnotdeteriorateatthisstage．Thephosphorusremovalratewas68.9%indicatingthatasufficientcarbonsourceintheinfluentcouldnotonlyguaranteetheremovalofTNbutalsodetoxifyNO－2toreduceitsinhibitoryeffectonthephosphateaccumulatingorganismsPAOs．ThebatchtestsofphosphorusuptakebythesludgeunderdifferenttemperatureconditionsrevealedthatO2NO－3andNO－2couldallbeusedaselectronacceptorsforphosphorusuptake．TheaerobicphosphorusuptakeratewashigherthanthatwithNO－3andNO－2aselectronacceptors．ThephosphorusuptakeratesofO2andNO－3aselectronacceptorswerealsofoundtobenegativelycorrelatedwithtemperature．KeywordscyclicactivatedsludgetechnologyCASTreactorhightemperaturenitriteaccumulationshort-cutnitrificationphosphorusremovalammonia-oxidizingbacteriaAOBnitrite-oxidizingbacteriaNOB2．NO－2NO－3AOB．NO－→2NO－3NO－→3NO－212．、、3～6．NO－2NO－2、pH、DOFA678．9AOB20℃AOBNOBAOBNO－2．Grunditz10AOBNOB4035℃38℃．CAST、CAST．CAST．11.11．84L54L10%、、、、．322、25、28℃．1．2．3．4．5．6．7．8．9．pH、DO10．11．12．13．14．15．16．1CASTFig．1SchematicdiagramofCASTexperimentalsetupCAST46h2h1h、3h、0.5h0.5h．SＲT20d20%1/3pH7.0～9.0．1．1Table1Experimentalapproachofthereactor/℃/dMLSS/mg·L－1Ⅰ221～283189±300Ⅱ2529～953287±350Ⅲ2896～1722866±350．6LSBＲ300mg·L－1COD2h、23SBＲ4L．3SBＲPO3－4-P35mg·L－1SBＲ1DO2mg·L－1SBＲ2SBＲ3NO－3NO－2NO－3-NNO－2-N35mg·L－1．1.22d．1.3、、11．CH3COONaKH2PO4NH4ClCOD600mg·L－1NH+4-N60mg·L－1TN61.3mg·L－1TP10mg·L－1．PO3－4-PCODCODTN-NH+4-NNO－3-NNO－2-NN-1-．MLSSMLVSSSV30min．、DOpHMulti3420．22.1CAST2NH+4-N、NO－2-N、NO－3-NNO－2-N．NH+4-N1.4mg·L－1．22℃25℃NO－2-N1.0mg·L－1．Ⅰ22℃NO－3-N10.1mg·L－125℃ⅡNO－3-N8.5mg·L－1NO－3-N90d7.4mg·L－1．Ⅲ28℃2dNO－3-N1.2mg·L－167313CASTNO－2-N106dNO－2-NNO－2-N136dNO－2-N12.3mg·L－187.2%．9AOBAOBAOBNOBAOB．NO－2-N80%12～14．2CASTNO－2-NFig．2VariationofnitrogenconcentrationandNO－2-NaccumulationrateinCASTsystemunderdifferenttemperatureconditions2.2CAST3CAST．3aCOD600mg·L－1COD33.4mg·L－194.4%CASTCOD1516．3b22、25、28℃NH+4-N93.7%、97.3%98.1%NH+4-N．17NH+4-NAOB“”NOBNH+4-N．3bTNTN61mg·L－122℃TN12.0mg·L－180.2%．25℃29～73dTN9.0mg·L－1TN74dTN3.3mg·L－188.5%．28℃96～112dTN2.9mg·L－1112dTNTN12.4mg·L－182.9%．NO－3NO－182NO－3N2TNNO－2NO－2TNNO－21928℃NO－2NO－2-NTN．600mg·L－1203TN80%．3c22℃0.56mg·L－194.3%25℃1.42mg·L－186.9%．28℃97～134d1.8mg·L－185.8%134d．3.3mg·L－168.9%Ⅰ、Ⅱ25.4%18.0%．PAOs25℃2122EBPＲ20～25℃PAOs25℃GAOs．23NO－2-N．24NO－2-N10mg·L－125NO－2NO－2-N5mg·L－12NO－2-N12.3mg·L－1NO－2-N．7731403CASTFig．3NutrientremovalperformanceoftheCASTprocessunderdifferenttemperatureconditions4ⅠⅡ31.9mg·L－134.6mg·L－1Ⅲ25.2mg·L－16.7mg·L－19.4mg·L－1．97.8%、95.7%、87.8%．Ⅲ28℃GAOsPAOs22．-β-PHANO－2NO－2PAOs2426．27NO－2A2ONO－2PAOs19A2ONO－2NO－2PAOs4CASTFig．4AnaerobicphosphorusreleaseandaerobicphosphorusuptakecapacityoftheCASTsystematdifferenttemperatures．200mg·L－1．NO－2PAOsNO－287313CAST．NO－2PAOs．5/CODP/C．22℃P/C0.23P/C0.2825℃、P/C0.5、0.5428℃、P/C0.19、0.20．23P/C．P/CPAOsP/C．425℃CAST22℃、28℃53P/C．28℃CASTNO－2NO－2GAOspoly-PPAOspoly-P．Saito23NO－2PAOGAOGAOPAO．5P/CFig．5AnaerobicP/Coftypicalcyclesatdifferenttemperatures2.3CAST622、25、28℃．O2NO－329.40、7.21、5.62mg·g·h－16.78、4.51、3.40mg·g·h－1O2NO－30.9830.924CAST28．Zeng29ppk1EBPＲPAOsAccumulibacterⅠⅡIANO－3ⅡANO－2Flowers30IAⅡA．NO－3Zeng29NO－2NO－24.41、4.254.60mg·g·h－1NO－2NO－2HNO2NO－2HNO2NO－224．6Fig．6Anoxicphosphateuptakecapacityofthesludgeatdifferenttemperatures2.4CAST7Ⅰ22℃MLSSSVI3189mg·L－163.8mL·g－125℃80dSVIMLSSSVI3287mg·L－165.0mL·g－128℃MLSS2866mg·L－1SVI107mL·g－1SVI116mL·g－1973140．SVI22、25、28℃31．3f0.65、0.69、0.7932f．fPAOsf．Ⅲf．7Fig．7SludgesedimentationperformanceoftheCASTunderdifferentconditions31CAST22℃25℃NO－228℃NO－287.2%．CODNH+4-N．222℃25℃94.3%86.9%28℃PAOsNO－2PAOs68.9%．3O2NO－3NO－2f．1TurkOMavinicDS．Maintainingnitritebuild-upinasys