改善焦化废水生物脱氮效率的研究陈雪松

*陈雪松1,陈水荣2(1.浙江树人大学生物与环境工程学院,浙江杭州310015;2.浙江省冶金研究院,浙江杭州310007):采用SBR反应器对焦化废水进行生物脱氮处理时,存在NO2--N的积累现象。通过控制pH和投加碳源来改善生物脱氮效率。结果表明,把反应器内pH水平控制在7.0～7.5时,反硝化速率最大。比较了在好氧阶段2和缺氧阶段2投加甲醇对脱氮效率的影响。在没有外加碳源的情况下,SBR反应器的脱氮效率平均为78.4%,在好氧阶段2投加甲醇时,反应器的脱氮效率平均为90.2%,在缺氧阶段2投加甲醇时,反应器的脱氮效率平均93.8%。在投加甲醇后脱氮效率比没有外加碳源时有明显的提高,通过调节pH值和投加碳源可明显增加脱氮效果。:SBR,焦化废水,脱氮,pH,碳源:X703:A:1006-8759(2007)02-0021-04STUDYONIMPROVINGTHEBIODENITRIFICATIONEFFICIENCYOFCOKINGWASTEWATERCHENXue-song1,CHENShui-rong2(1.SchoolofBio.andEnviron.Eng.,ZhejiangShurenUniv.,Hangzhou310015,China;(2.MetallurgicalEnvironmentalProtectionInstituteofZhejiangProvince,Hangzhou310007,China)Abstract:ThereexistedaccumulativephenomenaofNO2--Nwhenbiodenitrifyingcokingwastewa-terbySBRreactor.ThebiodenitrificationefficiencywasimprovedbycontrollingpHvalueandaddingcarbonsourceinthispaper.TheexperimentalresultsindicatedthatthedenitrificationspeedreachedhighestwithpHvaluenear7.0～7.5.TheeffectsofaddingmethanolonthedenitrificationefficiencyinAerobicPhase2andAnoxicPhase2werecompared.Theaveragedenitrificationeffi-ciencyofSBRreactorwas78.4%withoutaddingcarbonsource.Itwas90.2%withmethanolinAerobicPhase2.Itwas93.8%withmethanolinAnoxicPhase2.Fromtheaboveweknewthatthedenitrificationefficiencyimprovedgreatlybyaddingcarbonsourcelikemethanol.SocontrollingpHvalueandaddingcarbonsourcewereeffectivewaystoimprovethedenitrificationefficiency.Keywords:SBR,Cokingwastewater,Denitrification,pHvalue,Carbonsource:2006-12-15*(20031029):陈雪松(1972-),女,硕士研究生,讲师,主要从事环境污染控制工程课程的教学和研究工作,发表论文十余篇。0(,、、),、。[1]。,[2～4]。pH。pH/EnergyEnvironmentalProtectionVol.21,No.2Apr.,2007212200741pHCODcr/(mg·L-1)NH3-N/(mg·L-1)/(mg·L-1)/(mg·L-1)7.0～9.0750～1450300～650100～26020～451SBR2pHpH11226.5～7.06.605.913.902.557.0～7.57.8912.744.315.597.8～8.06.3010.583.454.678.0～8.53.527.672.322.92。(1g7.14g),pH。,,(1g3.57g)。pH,pH,pH,pH。,,NO3-NO2-,NO3-NO2-,,,。,。。SBRpH、。11.1,、、,,1。15%Na2CO3pH。1.2SBR1。48h,0.5h、39h、3h、0.5h、5h。/,1(9h)、1(9h)、2(9h)、2(12h)。22.1NO2--NSBR,/。,/(SND)。37.0%[5]。NH3-N、NO2--N、NO3--N2。2,NH3-NNO3--N,NH3-N95.0%～99.0%。NO2--N,47.5～103mg/L,NO2--N。1.0gNO2-N1.14gCODCr,,NO2--NCODCr。pH、。,pH。2.2pHpH6.5～7.0,126.60mg/(Lh)3.90mg/(Lh),125.91mg/(Lh)2.55mg/(Lh)。pH7.0～7.5,,128.08mg/(Lh)4.31mg/(Lh);1212.74mg/(Lh)5.59mg/(Lh)。pH,·22·陈雪松等改善焦化废水生物脱氮效率的研究mg·L-1·h-12NH3-N、NO2--N、NO3--N。,4pH21,21。,。,、,。,、,。,,,,。2.3,,N0x--N(NO3--NNO2--N)。。,:(、、、);(,);,。,.,,,,。,,。,:CH3OH※HCOH※HCOOH※CO2,,,。,:6NO3-+5CH3OH※3N2+5CO2+7H2O+60H-(NO3-)6NO2-+3CH3OH※3N2+3CO2+3H2O+60H-(NO2-),mgNO3--NN22.47mg。,mgNO2--NN21.48mg。,,:ρm=2.47N0+1.53N1+0.87D00.5mg/L,NO3-2.91mg,(NO2-)1.92mg,34%。()SBR(22),CH30H/NO2--N2.0。22,pH7.0～7.5。3。2NH3-N、NO2--NNO3--N4,2NH3-N、NO2--NNO3--N5。,SBR74.6%～82.1%(78.4%)。2,87.9%～92.4%(90.2%),2,92.8%～94.2%(93.8%)。,。222.5,2,。42NH3-N、NO2--NNO3--N212·23·34,2211.5mg/(Lh),1,;25.82mg/(Lh),。,2,,。2(5),26h23.1mg/(Lh),6h4.51mg/(Lh),。,,,,,。3(1)pH(6.5～7.0、7.0～7.5、7.8～8.0、8.0～8.5)。pH7.0～7.5,。pH21,21。(2)。2,90.2%,2,93.8%,2,。(3)2,26h23.1mg/(Lh),6h4.51mg/(Lh),。:[1],.[J].,2002,(4):12～14.[2]KeisukeH.Nitrificationatlowlevelsofdissolvedoxygenwithandwithoutorganicloadinginasuspended-growthreactor.WaterRes,1990,24(3):297～302.[3]AllemanJE.Elevatednitriteoccurrenceinbiologicalwastewatertreatmentsystem.WaterSciTech,1984,17:409～419.[4]MunchE.V.,LantP.andKellerJ.Simultaneousnitrificationanddenitrificationinbench-scalesequencingbatchreactors[J].Wat.Res.,1996,30(2):277～284.[5],,.SBR[J].,2005,21(6):60～63.(上接第20页)CC0Ln=-kt(1)、,,:。,K;,K。(2)、28～38mg/L,2.9～3.6mg/L。。(3),pH1pH,18℃,、。:[1].[M].:,1998,33.[2].[J].,2005,23(3).[3]GagatePR;PanditAB.Areviewandassessmentofhydrodynamiccavitationasatechnologyforthefuture[J].UltrasonicsSonochemistry,2005,12(1):21～27.[4]K,K.Jyoti,A,B.Pandit.Ozoneandcavitationforwaterdisinfection[J].BiochemicalEngineeringJournal.2004,18:9～19.[5].[J]..2004,40(4):334～336.[6]LiYongfeng.Studyonsonochemicaldegradationofchorobenzeneinwasterwater[J].ChemEngofChineseUniv,2002,16(1):93～96.[7].B[D].,2005.[8].[J].,2005,17(3):549～553.·24·陈雪松等改善焦化废水生物脱氮效率的研究52NH3-N、NO2--NNO3--N