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4310201710JOUＲNALOFBEIJINGUNIVEＲSITYOFTECHNOLOGYVol．43No．10Oct．2017pH100124pHSBＲpH．pH8.0pH6.6．pH8.0pH．KHCO3pH0.155g/g·d．pH=8.0KHCO3．KHCO3pH=8.0．pHX703.1A0254－0037201710－1554－09doi10．11936/bjutxb20161100242016-11-10216770051949—、E-mailpyz@bjut．edu．cnInfluenceofpHandAlkalineSubstancesonShortcutNitrificationPENGYongzhenLILukaiLIXiyaoGUOSiyuWANGShuyingNationalEngineeringLaboratoryforAdvancedMunicipalWastewaterTreatmentandＲeuseTechnologyEngineeringＲesearchCenterofBeijingKeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentＲecoveryEngineeringBeijingUniversityofTechnologyBeijing100124ChinaAbstractTheeffectofpHonshortcutnitrificationisnotuniformandtheeffectofdifferentalkalinesubstancesonshortcutnitrificationhasnotbeenreportedsofar．TheinfluenceofpHandalkalinesubstancesonshortcutnitrificationwasstudiedinsequencingbatchreactorsSBＲfedwithartificialwastewater．ThetestshowedthatthebestpHforshortcutnitrificationwas8.0andshortcutnitrificationalmoststoppedwhenthepHwaslessthan6.6．WhentheinitialpHwas8.0regulatedbyaddingdifferentalkalinesubstancesthereactorregulatedbyhydroxideandNa2CO3stoppedreactingduetopHreducing．TheacidbufferactionofKHCO3wasthestrongestamongthem．ThereforethepHofthereactorregulatedbyKHCO3reducedmostslowlythustherateofshortcutnitrificationreactionincreased．Theaverageofnitrateaccumulationratewas0.155g/g·d．WhenthepHwas8.0inthewholeprocessofreactionsregulatedbyaddingdifferentalkalinesubstancesappropriatelytheKHCO3wasthemostsuitablesubstrates．TheresultsindicatethatitisnecessarytomaintainthepHgreaterthan6.6byaddingKHCO3bothintheengineeringapplicationfeasibilityandefficiencyconsidered．KeywordsshortcutnitrificationpHalkalinesubstancesNO－2-Naccumulationrate10pH1．－2．NH+4-NNO－2-N25%40%、34-7．8．pH9-11．AOBpHpH121∶1H2SO40.5mol/LNaOHpHpH13、14Na2CO315NaHCO3．NaOH、Na2CO3、NaHCO3pHAOB．pHpH．11.1NH+4-N100mg/L0.575mg/L16FeCl3·6H2O1500mg/LH3BO3150mg/LCuSO4·5H2O30mg/LKI180mg/LMnCl2·4H2O120mg/L．60dSBＲ6.28m340%78.5d、3h、3～4h、、1.5h、0.5h、90%．．1.21SBＲ．1L．3000±50mg/L．pH．30min1．300mL/min400r/min．1—2—2.1—3—3.1—4—4.1—5—pH/DO5.1—pH5.2—DO．1SBＲFig．1SchematicdiagramofSBＲ1．1pH6NaHCO3pH．1pH=8.02、3．2、32pH8.0555120173pH8.0．1Table1ExperimentalconditionsappliedinbatchtestspH1-1#9.0NaHCO31-2#8.5NaHCO311-3#8.0NaHCO31-4#7.5NaHCO31-5#7.0NaHCO31-6#2-1#8.0NaOH2-2#8.0KOH22-3#8.0Na2CO32-4#8.0NaHCO32-5#8.0KHCO32-6#3-1#8.0NaOH3-2#8.0KOH33-3#8.0Na2CO33-4#8.0NaHCO33-5#8.0KHCO33-6#1.3COD、MLSS、MLVSS170.45μmNH+4-N、NO－2-N、NO－3-NLACHATQuikChem8500Series2pHpH/DOWTWMulti340i．22.1pH2.1.1pH20.1h1-1#～1-6#NH+4-NpH．31NaHCO3pHNaHCO3NH+4-NpHNH+4-N．2．NaHCO3pH．pHNH+4-N．3FA．1-6#6.5hNH+4-N98±2mg/L．2pHNH+4-NFig．2VariationofNH+4-Nconcentrationindifferentinitialconditions2、3pHNH+4-N．pH=7.5NH+4-N3h100mg/L67mg/LNO－2-N3h24mg/LpH=7.0NH+4-NpH=7.52hNH+4-N84mg/LNO－2-N9mg/L．3pHNO－2-NFig．3VariationofNO－2-Nconcentrationindifferentinitialconditions655110pH、NO－2-N、FA、pH．18ρFA=ρNH+4-N×10pHexp6334/237+θ+10pHFA1-4#、1-5#FA、pH4ab．FAAOB10～150mg/L18-19．4FA2.5mg/LAOBFA．1-4#、1-5#NH+4-NpHAOB．1-4#、1-5#pH6.50、6.451-6#pH6.60．pH≤6.60NH+4-N．Hankison20AOBpHpH621．．pH＞6.60．2.1.2pHpH=8.08.59.0NH+4-N、NO－2-N2N2O1822、、．2pH=9.0、8.5、8.0NH+4-NpH=8.5＞pH=8.0＞pH=4pH7.57.0FApHFig．4VariationofFAconcentrationandpHwheninitialpHis7.5and7.09.0NO－2-NpH=8.0＞pH=8.5＞pH=9.0pH=9.0NO－2-NNO－2-NaccumulationrateNAＲ0.5hNO－2-N5.56mg/L·h．5pH=9.01-1#pHFAt=0.5h30mg/LFA15.4mg/LFAAOBNH+4-N、NO－2-N1-2#、1-3#AOBNO－2-N10.70mg/L·h9.47mg/L·hpH1-2#2hFA＜10mg/L1-3#AOB23．pH9.0FAAOB．2pH=9.08.58.0NH+4-N、NO－2-NTable2LinearfittingfortheNH+4-NandNO－2-NconcentrationovertimepH=9.0pH=8.5pH=8.0NH+4-Ny=－2.5611x+68.631y=－5.3398x+80.265y=－4.9213x+85.812Ｒ20.97080.99440.9903NO－2-Ny=2.7810x－2.5361y=5.4167x－7.2188y=5.5608x－6.1839Ｒ20.99570.99800.995621-2#NH+4-NNH+4-NNH+4-N88%＞1-3#NH+4-N70%NO－2-N．NOB6755120175pH9.0、8.5、8.0pH、FAFig．5VariationofFAconcentrationandpHwheninitialpHis9.08.5and8.01-2#NO－3-N1-3#．1-2#、pH、FANOBNO－2-NNO－3-N．6pH8.08.5NO－3-NFig．6VariationofNO－3-NconcentrationwheninitialpHis8.0and8.5、pH8.0．24pH7.012pH9.0～9.590.95%～94.92%25pH7.8268.3～8.5Tokutomi27pH8.028、Capdeville29pH8.5、、．2.22.2.1pH=8.0pH=8.0．75．2-1#、2-2#、2-3#2.5h8pHt=2.5hpH6.6．2.5h3vvNaOH=vKOH＜vNa2CO3Na2CO3NaOH、KOHAOBpHNa2CO3CO2－3、OH－AOBCO2－32-4#、2-5#pH2-5#pHt=5.5h7.03pH2．7pHNH+4-N、NO－2-NFig．7VariationofNH+4-NandNO－2-Nconcentrationt=5.0h2-5#NH+4-N16.22mg/L2-4#35.33mg/LNO－2-N20.00mg/L．7、82hNH+4-N、NO－2-NNO－2-N2-5#pH2-4#．2h2-5#NH+4-N855110pH、NO－2-N2-4#2～3hNO－2-N1mg/L·h7mg/L·h．t＞3hNO－2-N6±0.7mg/L·h．8KHCO3NaHCO32hNH+4-N2-5#pH2hpHAOB2～5hKHCO32-5#0.155g/g·d2-4#0.109g/g·d．8pHpH、NO－2-NFig．8VariationofpHandNO－2-NaccumulationratepH5vNaOH=vKOH＜vNa2CO3＜vNaHCO3＜vKHCO331NaOH、KOH、Na2CO3pH6.62Na2CO3NaOH、KOHAOB3KHCO36.5hpH7.0．pHKHCO3．2.2.2pH=8.0pH325±0.5℃pH8.09．pH=8.033．93K+、Na+3-1#NH+4-N、NO－2-N3-2#3-4#3-5#．Na+、K+K+AOBNa+NaOH、NaHCO3NO－2-NKOHKHCO3．95pH8.0Fig．9VariationofNH+4-NNO－2-NandNO－3-NconcentrationwhendifferentalkalinemattermaintainsconstantpH955120173pH=8.0Table3LinearfittingfortheNH+4-NNO－2-NandNO－3-NconcentrationovertimewhendifferentalkalinemattermaintainsaconstantpHNH+4-NNO－2-NNO－3-NＲ2Ｒ2Ｒ2NaOHy=－4.3015x+1