低CN城市污水亚硝酸型硝化试验研究姚晓园

:2008-02-28;:2008-03-26:(NY[2005]3020):(1963—),,,、。E-mail:[e-mail]:1672-9250(2008)02-0188-05C/N姚晓园1,陆天友2,魏　琛3(1.,　　550002;2.,　　550002;3.,　400067)　:对低C/N城市污水进行亚硝酸型硝化的可行性、稳定性进行了研究,具体研究了系统的启动培养、稳定亚硝化、污泥毒害、短暂亚硝化、污泥适应等5个阶段及污泥的适应性问题。低C/N城市污水可实现稳定的亚硝酸型硝化,其亚硝化率最高可达90%。试验中合理确定反应周期的首要因素是系统出水NH4+-N的浓度至少达到50%降解率,其次是出水中NOx-NN应主要以NO2-N为主。根据泥龄维持所能维持的MLSS浓度确定系统泥龄在合理范围。系统不排泥和较长泥龄将不能通过排泥,将系统中硝化菌“洗出”,硝化菌也会最终适应亚硝酸型硝化的环境因素,从而导致亚硝酸型硝化现象的不可逆消失。杆状污泥絮体为亚硝酸型硝化现象的特征污泥相。:亚硝化;亚硝酸盐氮积累;泥龄;污泥适应性:X703.1　　　　　　:A　　,。,,SHARON(SinglereactorforHighactivityAmmoniaRemovalOverNitrite)、ANAM-MOX(ANaerobicAMMoniumOxidation)、OLAND(OxygenLimitedAutotrophicNitrificationDenitrification),(),(SHAR-ON)(ANAMMOX、OLAND)[1-2]。、,C/N,。,。:、、pH、、,(、)。,,2～3mg/L,,。,,,。,,、、,。,,,。C/N。1　SBR,188　　　　EARTHANDENVIRONMENT2008362Vol.36,No.2,2008DOI:10.14050/j.cnki.1672-9250.2008.02.0031。,1,COD,C/N≤0.57。1　Fig.1.Experimentdevice.1　Table1.Thequalityofsyntheticwastewater　　mg/LCODNH4+-NNOx--NTP0～4070～33000.5～1320～500[1-6],:25℃;pH:7.5～8.5(pH8.2～8.5,pH6.5～7.5);DO:0.2()～0.6()mg/L;HRT(HydraulicRetationTime):0.67～2d,SRT(SludgeRetionTime):。::;:N-1-;:HACH;:-;pH:pHS-3S;:YSI5100;MLSS:;,“”,:=NO2--N/NOx--NN,NOx--N=NO2--N+NO3--N。2　2.1　220d,(1—108d)、(109—176d)、(177—195d)、(196—208d)、(209—220d)5,2。2　Fig.2.Theexperimentalprocedure.　　,。COD,,;,。,3。109dNO2-N,176d,;,NH4+-NNH4+-N30%～50%。NO2--NNOx--NN,40%～90%,。3111d。1892　　:C/N177d,FA(FreeAmmonia),,,NH4+-N200mg/L,NOx--N75mg/L,NO2--N,NH4+-N。FA,196dNH4+-N70mg/L,,NH4+-N30mg/L,,50%～90%,,209d,NO2--N,NO3--N,,NH4+-N10mg/L,DO、、pH,,NO2--N。,,(N2)。(HRT)、(T)、、,。3　111Fig.3.Theperiodiccurveonthe111thday.2.2　,(HRT)(T)。T12hHRT1d,T24hHRT2d,T8hHRT0.67d。(T)(HRT)0.67～2d。NH4+-N50%,NOx--N。111d(3),12h(HRT=1d),NH4+-NNH4+-N53%,NO2--NNOx--N83%。,,,,(T=12h)。211d(4),6h,,12h,NOx--NNO3--N,NO2--N,。,,。2.3　,COD,。,MLSS0.9～1g/L,40～90SRT13～25d,25dMLSS,0.9g/L,0.2g/L。,NO2-N。(SRT25d),NO2-N,NH4+-N。MLSS。,,MLSS,,,NH4+-N,,NOx--NN。。,,“”(washout),,(90%);,;,,,,。,、DO、pH、,,NO2--N。,,190　　　　　　2008　,,。,NOx--NNO3--N,,。4NO2--N,。NO2--N(NO2--N),NO2--N。,NO2--N。Turk,、[7]。,,(4)[7]。,,。,NO3--N,,。,,,,,,“Washout”。,NO2--N、NO3--N。Brouwer[5]SHARON“”,HRT=SRT,,,NO2--NNO3--N。4　NO2--NFig.4.TheNO2--Naccumulationvariationcurveofthesludgeadaptationperiod.2.4　(130d)(5),,0.4～1.1mm,0.1mm,。5,。,,,。5　130Fig.5.Thephotooftheactivatedsludgeonthe130thday.　　,,SVI(SludgeVolumnIndex)70～80,COD。。3　(1)C/N,90%。、、、、5220d。,,。(2),(HRT)(T)。NH4+-N50%,NOx--NNO2--N。(3),,MLSS,,NH4+-N,NOx--N。1912　　:C/NNO2--N,NO2--NNH4+-N,MLSS。(4),,“”(washout),,。,;,,,,。⑸,NO3--N,,。。　　　[1]　,,.[J].,2001,21(11):11-13[2]　,,,.[J].,2003,24(3):50-55[3]　,.—SHARON-ANAMMOX[J].,2001,27(10):21-24[4]　VanDongen,JettnMSM,VanLoosedretchMCM,etal.TheSharon-Anammoxprocessfortreatmentofammoniumrichwastewater[J].WatSci&Tech,2001,44(1):112-121[5]　EmielB,RolandB.Restorationofaquaticmacrophytevegetationinacidifiedandeutrophiedsoftwaterlake[J].AquaticBotany,2002,73:405-431[6]　BalmellB,DebeyP,AndersonKK,etal.Studyoffactorscontrollingnitritebuild-upinbiologicalprocessesforwaternitrification[J].WatSci&Tech,1992,26(5-6):1017-1025[7]　OliverT,BactensD,VanrolleghenPA,etal.Stabilityofnitritebuild-upinanactivatedsludgesystem[J].WatSci&Tech,1999,39(1):215-225PARTIALNITRIFICATIONTONITRITEINURBANWASTEWATERWITHLOWC/NYAOXiao-yuan1,LUTian-you2,WEIChen3(1.GuizhouProvinceArchitecturalDesignandResearchInstitute,Guiyang550002,China;2.SchoolofCivilConstructionandEngineering,GuizhouUniversity,Guiyang50002,China;3.SchoolofEnvironmentandBiologyEngineering,ChongqingTechnologyandBusinessUniversity,Chongqing400067,China)AbstractThispaperdealtwiththefeasibilityandstabilityofpartialnitrificationtonitriteinurbanwastewaterwithlowC/N,intermsofstart-up,stablepartialnitrification,sludgepoisoning,shortpartialnitrificationandsludgeadaptation.Duringthepartialnitrificationprocess,thestablenitriteaccumulationcanreachupto90%intheurbanwastewaterwithlowC/N.ThedeterminationofreactioncyclerequiredforNH4+-Ndegradationratiowithatleast50%andtheNOx-NineffluentdominatedbyNO2-N.ThesludgeageofthesystemtoareasonableextentwasdeterminedbytheconcentrationsofMLSSinrelationtoeachSRT.InthecaseofthesystemunabletodiscardsludgeorwithlongSRT,thenitrifyingbacteriawillnotbe“washedout”buteventuallyadaptedtothepartialnitrificationcircumstancetoresultinirreversibledisappearanceofpartialnitrification.Thesludgefrompartialnitrificationischaracterizedbybacillaryflocks.Keywords:partialnitrification;nitriteaccumulation;sludgeage;sludgeadaptability192　　　　　　2008