常温内源反硝化脱氮过程中pH和ORP变化规律dcc596a1d4d8d15abe234eed

63Vol.6,No.320053TechniquesandEquipmentforEnvironmentalPollutionControlMar.2005pHORP王少坡1王淑莹1彭永臻1*李勇智2(1,100022;2,100037)SBR,25,NO-3NNO-2N,pHORP,ORP,;pHpH,pH,pH,pH,;pH,pH,,,ORPpHProfilesofpHandORPduringbiologicalnitrogenremovalprocessbyendogenousdenitrificationatnormaltemperatureWangShaopo1WangShuying1PengYongzhen1LiYongzhi2(1KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100022;2TheCollegeofChemistryandEnvironmentalEngineering,BeijingTechnologyandBusinessUniversity,Beijing100037)AbstractLaboratoryexperimentswereconductedtostudytherelationshipbetweenpH,ORPandendogenousdenitrification.ASBRreactorwasoperatedindenitrificationmodeat25.Inthiswork,itisshownthatORPdecreasedgraduallyduringendogenousdenitrificationandabendingpointappearedontheORPcurvewhendenitrificationstopped.ThereweretwovariationwaysofpHduringendogenousdenitrification.Firstly,ifthevalueofthemaximalpHduringdenitrificationwaslessthan9,pHwillincreaseduntilldenitrificationwasfinishedandthendecreasedpresentingaturningpointonthepHcurve.Secondly,ifthedenitrificationwasntfinishedwhenthepHwasabove9,pHwouldbecomestablewithafluctuatingvalue.TheresultssuggestthatORPwasamorereliablecontrolparameterthanpHduringendogenousdenitrification.Keywordsbiologicalnitrogenremova;lendogenousdenitrification;pH;oxidationreductionpotential(ORP):(20377003);(KZ200310005003);:2004-06-07;:2004-07-23:(1975~),,,Emai:[e-mail]*,,22,,(NO-2);,(NO-3),,[1,2],,,(N2N2O),3:,,,,3:pHORP,ORPpH[3,4]WarehamIbrahim[5,6]pHORP;[7~9],pHORPSBRpHORPpHORP,11.1,11Table1CharacteristicsofsludgeanditssupernantusedinthelaborataryexperimentpHCODCr(mg/L)NH+4N(mg/L)NO-2N(mg/L)NO-3N(mg/L)TP(mg/L)VSS/MLSS(%)7.3~7.630~400~30~10~51~370~761.28LSBR,7L,;:MLSSNH+4NNO-3NNO-2NCODCr,ORPpH1SBRFig.1Schematicdiagramofexperimentalequipment1.3NH+4N;NO-3N;NO-2NN(1);CODCr5B3;ORPpHWTWMulti340i,MLSSVSS[10]1.41.4.1不同NO-2NNO-3N的内源反硝化过程中pHORP变化规律SBR,25,MLSS6500mg/L,(NO-xN=NO-2N+NO-3N)40mg/L,NO-2NNO-3N,,,5NO-2NNO-3N,:4031221304,NO-xN:40mg/LNO-2N30mg/LNO-2N+10mg/LNO-3N20mg/LNO-2N+20mg/LNO-3N10mg/LNO-2N+30mg/LNO-3N40mg/LNO-3N1.4.2连续批式试验中pHORP变化规律SBR,25,MLSS6500mg/L,NO-2N,05mg/L,,,40mg/LpHORP22.1pHORPNO-2N40mg/L,2,3pHORP3,,pH,ORPpH739(420min)841,ORP-75mV-229mVpH,,(1)(2),H[11]ORP,2162NO-2NNO-3N=40Fig.2Dynamicsofnitrite,nitrateandammoniaduringendogenousdenitrificationata40ofinitialNO-2NNO-3N3NO-2NNO-3N=4:0pHORPFig.3ChangesofpHandORPduringendogenousdenitrificationata40ofinitialNO-2NNO-3N,NO-x,ORP,,,,pH,pH(B),NO-xN,,ORP,ORP(C)BC2A,BC,dpH/dt(),dORP/dt,45,pHORP,pH4dpH/dtFig.4ChangesofdpH/dtduringendogenousdenitrification5dORP/dtFig.5ChangesofdORP/dtduringendogenousdenitrificationORPNO-2+3H1/2N2+H2O+OH-(1)NO-3+5H1/2N2+H2O+OH-(2)2.2NO-2NNO-3NpHORP6NO-2NNO-3NpHORP,ABCDENO-2N:NO-3N4031221304pHORP,,NO-2NNO-3N,pHORP,pHORP,6a6b,NO-2NNO-3N,pHORP,pH,NO-2N,223:pHORP(a)pH(b)ORP6NO-2N:NO-3NpHORPFig.6ChangesofpHandORPduringendogenousdenitrificationatdifferentinitialNO-2NNO-3NpHNO-2NNO-3N,NO-2N0032gN/gVSSd,NO-3N0020gN/gVSSd,15,,NO-2N,NO-3N,NO-2NNO-3N4031221304,365min410min440min520min565min,NO-xNNO-2N,,,pH;,NO-2N,NO-xN,ORP,,ORP-160,,NO-3N,,,pH,NO-3N,pH,,pHORPNO-2NNO-3N2.3pHORP78pHORP,,8pH,,NO-xN,,pH,pHORP,,pH,,,7,68h80h,pH,pH,,pH9,,pH91ORP,pH:(1)pH(pH9),,;(2),,,78pHORPFig.7ChangesofpHandORPduringeightcyclesofendogenousdenitrification236(HCO-3)(CO2-3),HCO-3/CO2-3,,,,pHpHORP,,pH,ORP,,,Na2CO3pH9,,,pHORP,pH,pH,pH,pH,ORPpH,,ORP3(1)pH,pH,,,;ORP,,,ORP(2)pH,pH,ORP(3)(NO-xN),NO-2N,,pH,ORP,pHORPNO-2NNO-3N[1],..,1997,19(4):25~28[2]..:,1989.15~16[3]KuoChengChen,eta.lRealtimecontrolofanimmobilizedcellreactorforwastewatertreatmentusingORP.WaterResearch,2002,36(1):230~238[4]E.Pau,leta.lProcessstateevaluationofalternatingoxicanoxicactivatedsludgeusingORP,pHandDO.WaterScienceandTechnology,1998,38(3):299~306[5]WarehamDavidG.,eta.lSludgedigestionusingORPregulatedaerobicanoxiccycles.WaterResearch,1994,28(2):373~384[6]IbrahimAlGhusain,eta.lUseofphascontrolparameterforaerobic/anoxicsludgedigestion.JournalofEnvironmentalEngineering,1995,121(3):225~235[7],.DOORPpHSBR.,2001,17(4):6~11[8],,.SBRpHORP.,2002,23(1):39~44[9],,.SBR.,2003,23(6):732~737[10].(3):,1997[11],..:,199850~5124