不同电子受体反硝化过程中CN对N2O产量的影响尚会来

CNN2O,＊,,(,　100124):SBR,CN,N2O.,CN0、1.2、2.4、3.5、5.020,CN0、1.8、2.4、3.0、4.3、5.2、6.620.6.,,CN3.0,N2O0.044mg·L-1;,CN5.0,N2O0.135mg·L-1,3.,N2O:,N2O;N2O;CN,,N2O.,,40%,CN=3,N2O.:;;;CN;:X703.1　:A　:0250-3301(2009)07-2007-06:2008-07-28;:2008-09-16:“”(2006BAC19B03);(PXM2008-014204-050843);(ykj-2007-1063):(1982～),,,,E-mail:[e-mail]＊,E-mail:[e-mail]usOxideProductionDuringDenitrificationwithDifferentElectronAcceptorsSHANGHui-lai,PENGYong-zhen,ZHANGJing-rong,WANGShu-ying(KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100124,China)Abstract:TheexperimentinvestigatedthenitrousoxideproductionunderdifferentCNratiosduringdenitrification,takingnitrateandnitriteaselectronacceptorrespectively.Ethanolwasselectedascarbonsource.TheCNratioswere0,1.2,2.4,3.5,5.0and20whennitratewastakenaselectronacceptorandCNratios0,1.8,2.4,3.0,4.3,5.2,6.6,20.6whenelectronacceptorwasnitrite.Theresultsindicatedthat:theoptimumCNratiowas3.0takingnitriteaselectronacceptorandtheN2Oproductionwas0.044mg·L-1;theoptimumCNratiowas5.0takingnitrateaselectronacceptorandtheN2Oproductionwas0.135mg·L-1whichwas3timeshigherthanthatofnitriteaselectronacceptor.Thoughtheelectronacceptorchanged,thetrendofN2Oproductionwassimilar:whencarbonsourcewasbadlyinsufficient,theproductionofN2Oanddenitrificationratewerebothquitesmall;theN2Oproductionincreasedwiththeincreasingofthequantityofcarbonsource;whenthecarbonsourcewasexcessive,theN2Oproductionsharplyraised.Consequently,comparedtocompletenitrificationanddenitrification,short-cutnitrificationanddenitrificationcouldsave40%carbonsource.Moreover,controllingCN=3couldreducetheproductionofN2Oinshort-cutnitrification.Keywords:denitrification;nitrate;nitrite;CNratio;nitrousoxide　　N2O,[1].CO2320,,120a,,NO,.N2O[2],N2O[3,4].N2O.,N2O.CN,,CN,N2O,CN,,,CN,,N2O.,NO-2-N,.[5]:①,25%,;②40%,30720097　　　　　　ENVIRONMENTALSCIENCEVol.30,No.7Jul.,2009DOI:10.13227/j.hjkx.2009.07.023CNTN;③50%;④;⑤,.,Zeng[6]N2O.Park[7]NO-2-N,N2O.,CNN2O.,CODN,4～15[8].CODN,3.4～4[9],COD600～800mgL,300～400mgL,.CODN,5～10[10],.,CN[11].,.,、CNN2O.1　1.1　SBR,NaNO3NO-3-N30mg·L-1,,CN0、1.2、2.4、3.5、5.020.NaNO2NO-2-N30mg·L-1,CN0、1.8、2.4、3.0、4.3、5.2、6.620.6.,CNN2O,,CNN2O.1.2　SBR,6L,3L.,N2O,60L·h-1,,,,0.5h,N2O,,,N2O(1).1　Fig.1　Schematicdiagramofexperimentalsystem　1.3　1.3.1　DO、pHORPMulti340i(WTW)DO、pHORPDO、pHORP.COD、NH+4-N、NO-2-N、NO-3-NMLSS[12].TOCTNmultiNC3100(AnalytikJenaAG)TOCTN.1.3.2　N2ON2O:6890N(Agilent),HP-Plot(30m×0.53mm×25μm)N2O.:110℃;180℃;ECD300℃.N2O:N2O.,,0.5mL1000mgLHgCl2;N2,0.5h,N2O.N2O.Kimochi[13].2　NaNO3、NaNO2NO-3-NNO-2-N30mg·L-1,、N2ON2O.,2008　　　　　　30CNN2O.N2O,,;,N2O.N2O,CN.2.1　N2O,(CN0),,CN1.22.4N2O,2CN1.2N2O.2,120min,N2O,2.45×10-2mg·L-1,N2O,,NO-3-NNON2O,N2O,,N2O.2　CN1.2N2OFig.2　ProductionofN2OwithCN1.2　3CN0、1.22.4,N2O、(N2O-NNOx-N).,CN,N2O,,3CN,,,.3[(NOx)(MLSS·t)],CN,,,.N2O,CN1.2,N2O0.4%.,,N2O,,3CN10%、18.44%33.55%.3　CNN2O、Fig.3　N2Ooutput,conversionrateandspecificdenitrificationrateunderdifferentCN　CN3.5、5.020,3CNN2O.4CNN2O.CN3.5,N2O0.227mg·L-1,CN1.210,,71%,NO-2-N.,CN5,,,91.41%,4,N2O0.135mg·L-1,CN3.5,,,,N2O,.CN5,,N2O.CNN2O.4CN20,N2O,0.316mg·L-1,CN5,,,,30min,99.29%,N2O20097:CNN2O30min,,.,,N2O,CNN2O.4　CN3.5、5.020N2OFig.4　ProductionofN2OwithCN3.5,5.0and20　2.2　N2ONaNO2NO-2-N30mg·L-1,CN0、1.8、2.4、3.0、4.3、5.2、6.620.6.5CNN2O、.,CN0、1.8N2O,0.07320.0573mg·L-1.CN0N2O2.72%,CN1.80.27%.CN2.4,N2O,0.120mg·L-10.33%.CN3.0,N2O,0.0439mg·L-10.12%.CN,N2O,CN5.2,N2O0.659mg·L-11.93%.CN20.6,N2O0.297mg·L-10.80%.NO-3-NN2O,,N2O,,(5CN2.4),N2O,,CNN2O(5CN3.0).5,CN3.0,99%.CNN2O,NO-2-NCN3.05.2,N2O,CN5.2,N2O,.5　CNN2O、Fig.5　N2Oproduction,N2OconversionrateandthespecificdenitrificationrateunderdifferentCNratiostakingnitriteaselectronacceptor　3　6,,CN,N2O,N2OCN2AB,C,CN2OCN.,A,,N2O,Itokawa[16],CN,N2O,N2O,,,NO-3-N,N2O.,N2O,,NO-2-N.Itokawa[16]CN3.5,20%～30%N2O,N2O,2010　　　　　　30N2O.,CN,CN3.5N2O,0.227mg·L-10.83%.5.0,0.135mg·L-10.41%.CN3.5,,N2O,CN5.0,N2O.CN20,N2O,N2O.,CN3.0,0.044mg·L-1.CN,40%,N2O.CN(CN=2.4),N2OCN(CN=3.5)1.89.6　CNN2OFig.6　VariationofN2OproductionandconversionrateunderdifferentCNratioanddifferentelectronacceptor　N2O,,Otte[14]N2O,,,N2O.Greenberg[15],N2O,N2O,CNN2O.Itokawa[16],CN,,,N2O.7,,.60min,NO-3-N1mgL,,,COD69mgL,,COD,,N2O,N2O.CNN2O,N2O,.7　CN3.5NO-2-N、NO-3-NCODFig.7　VariationsofNO-2-N,NO-3-NandCODduringCN3.5onecycle　4　(1)CNN2O,,N2O,.(2)CN,CNN2O2,,,N2OCN.,CN5.03.0.(3)CN,,40%,N2O,(CN=2.4),N2O(CN=20117:CNN2O3.5)1.89.(4),CN,,CNN2O,NO-2-N.:[1]　IPCC.Climatechange:thescienceofclimatechange[M].Cambridge:CambridgeUniversityPress,1996.[2]　PeterC,PatrickC,RpbertH.Nitrousoxideemissionfrommunicipalwastewatertreatment[J].EnvironmentalScienceTechnology,1995,29:2352-2356.[3]　HanakiK,ZhengH,MatsuoT.Productionofnitrousoxidegasduringdenitrificationofwastewater[J].WaterScienceandTechnology,1992,26(5-6):1027-1036.[4]　ZhengH,HanakiK,MatsuoT.Productionofnitrousoxidegasduringnitrificationofwastewater[J].WaterScienceandTechnology,1994,30(6):133-141.[5]　,,.-[J].,2000,16(2):9-31.[6]　ZengRJ,LemaireR,YuanZ,etal.Simultaneous