常温内源反硝化脱氮过程中pH和ORP变化规律王少坡

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-3-NNO-2-N,pH、ORP。,ORP,;pHpH,pH、,pH,pH,;pH、,pH,,,ORP。　　　pH　ProfilesofpHandORPduringbiologicalnitrogenremovalprocessbyendogenousdenitrificationatnormaltemperatureWangShaopo1　WangShuying1　PengYongzhen1　LiYongzhi2(1.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100022;2.TheCollegeofChemistryandEnvironmentalEngineering,BeijingTechnologyandBusinessUniversity,Beijing100037)Abstract　LaboratoryexperimentswereconductedtostudytherelationshipbetweenpH,ORPandendoge-nousdenitrification.ASBRreactorwasoperatedindenitrificationmodeat25℃.Inthiswork,itisshownthatORPdecreasedgraduallyduringendogenousdenitrificationandabending-pointappearedontheORPcurvewhendenitrificationstopped.ThereweretwovariationwaysofpHduringendogenousdenitrification.Firstly,ifthevalueofthemaximalpHduringdenitrificationwaslessthan9,pHwillincreaseduntilldenitrificationwasfin-ishedandthendecreasedpresentingaturningpointonthepHcurve.Secondly,ifthedenitrificationwasn′tfin-ishedwhenthepHwasabove9,pHwouldbecomestablewithafluctuatingvalue.TheresultssuggestthatORPwasamorereliablecontrolparameterthanpHduringendogenousdenitrification.Keywords　biologicalnitrogenremoval;endogenousdenitrification;pH;oxidationreductionpotential(ORP):(20377003);(KZ200310005003);:2004-06-07;:2004-07-23:(1975～),,,。E-mail:[e-mail]*　　,。,2。2,,(NO-2);,(NO-3)。,,[1,2]。,,,(N2N2O)。,。3:、。,,。,,3:pHORP。、,ORPpH[3,4]。WarehamIbrahim[5,6]pH、ORP;[7～9],pH、ORPSBR。pH、ORP。pH、ORP,。1　1.1　,1。1　Table1　CharacteristicsofsludgeanditssupernantusedinthelaborataryexperimentpHCODCr(mg/L)NH+4-N(mg/L)NO-2-N(mg/L)NO-3-N(mg/L)TP(mg/L)VSS/MLSS(%)7.3～7.630～400～30～10～51～370～761.2　8LSBR,7L。,;。:。MLSS、NH+4-N、NO-3-N、NO-2-NCODCr,ORP、pH。1　SBRFig.1　Schematicdiagramofexperimentalequipment1.3　NH+4-N;NO-3-N;NO-2-NN-(1-)-;CODCr5B-3;ORP、pHWTWMulti340i,MLSS、VSS[10]。1.4　1.4.1　不同NO-2-N∶NO-3-N的内源反硝化过程中pH、ORP变化规律SBR,25℃,MLSS6500mg/L,(NO-x-N=NO-2-N+NO-3-N)40mg/L,NO-2-NNO-3-N,,,5NO-2-NNO-3-N,:4∶0、3∶1、2∶2、1∶3、0∶4,NO-x-N:40mg/LNO-2-N、30mg/LNO-2-N+10mg/LNO-3-N、20mg/LNO-2-N+20mg/LNO-3-N、10mg/LNO-2-N+30mg/LNO-3-N、40mg/LNO-3-N。1.4.2　连续批式试验中pH、ORP变化规律SBR,25℃,MLSS6500mg/L。,NO-2-N,0.5mg/L,,。,40mg/L。pH、ORP。2　2.1　pHORPNO-2-N40mg/L,2,3pHORP。3,,pH,ORP。pH7.39(420min)8.41,ORP-75mV-229mV。pH,,(1)、(2),H[11]。ORP,2162　NO-2-N∶NO-3-N=4∶0Fig.2　Dynamicsofnitrite,nitrateandammoniaduringendogenousdenitrificationata4∶0ofinitialNO-2-N∶NO-3-N3　NO-2-N∶NO-3-N=4:0pH、ORPFig.3　ChangesofpHandORPduringendogenousdenitrificationata4∶0ofinitialNO-2-N∶NO-3-N。,NO-x,ORP。,,,,pH,pH(B)。,NO-x-N,,ORP,ORP“”(C)。B、C2A,B、C。,dpH/dt(),dORP/dt,4、5,pHORP,pH、4　dpH/dtFig.4　ChangesofdpH/dtduringendogenousdenitrification5　dORP/dtFig.5　ChangesofdORP/dtduringendogenousdenitrificationORP。NO-2+3H→1/2N2+H2O+OH-(1)NO-3+5H→1/2N2+H2O+OH-(2)2.2　NO-2-N∶NO-3-NpHORP6NO-2-NNO-3-NpHORP,A、B、C、D、ENO-2-N:NO-3-N4∶0、3∶1、2∶2、1∶30∶4pHORP。,,NO-2-NNO-3-N,pH、ORP,pH、ORP,。6a6b,NO-2-NNO-3-N,pHORP,pH,NO-2-N,223:pHORP(a)pH(b)ORP6　NO-2-N:NO-3-NpHORPFig.6　ChangesofpHandORPduringendogenousdenitrificationatdifferentinitialNO-2-N∶NO-3-NpH。NO-2-NNO-3-N。,NO-2-N0.032gN/gVSSd,NO-3-N0.020gN/gVSSd,1.5,,NO-2-N,NO-3-N。,NO-2-N∶NO-3-N4∶0、3∶1、2∶2、1∶30∶4,365min、410min、440min、520min565min。,NO-x-NNO-2-N,,,pH;,NO-2-N,NO-x-N,ORP。,,ORP-160,,NO-3-N,,,pH。,NO-3-N,pH“”,。,pH、ORPNO-2-NNO-3-N。2.3　pHORP78pH、ORP,,8pH,,NO-x-N,,pH。,pHORP,,pH,,,7,68h80h,pH。,pH,。,pH9,,pH9.1。ORP,“”。pH:(1)pH(pH9),,;(2),,,7　8pH、ORPFig.7　ChangesofpHandORPduringeightcyclesofendogenousdenitrification236(HCO-3)(CO2-3),HCO-3/CO2-3,,,,pH。pH。ORP,,pH,ORP,“”,。,Na2CO3pH9,,,pHORP。,pH,pH,pH,pH,ORPpH,,ORP。3　　(1)pH,pH,,,;ORP,,,ORP“”。(2)pH,pH,ORP。(3)(NO-x-N),NO-2-N,,pH,ORP。,pH、ORPNO-2-NNO-3-N。[1],..,1997,19(4):25～28[2]..:,1989.15～16[3]Kuo-ChengChen,eta.lReal-timecontrolofanimmobi-lized-cellreactorforwastewatertreatmentusingORP.Wa-terResearch,2002,36(1):230～238[4]E.Paul,eta.lProcessstateevaluationofalternatingoxic-anoxicactivatedsludgeusingORP,pHandDO.WaterScienceandTechnology,1998,38(3):299～306[5]WarehamDavidG.,eta.lSludgedigestionusingORP-regulatedaerobic-anoxiccycles.WaterResearch,1994,28(2):373～384[6]IbrahimAl-Ghusain,eta.lUseofphascontrolparameterforaerobic/anoxicsludgedigestion.JournalofEnvironmen-talEngineering,1995,121(3):225～235[7],.DO、ORP、pHSBR.,2001,17(4):6～11[8],,.SBRpHORP.,2002,23(1):39～44[9],,.SBR.,2003,23(6):732～737[10].(3).:,1997[11],..:,1998.50～5124