低溶氧下生物流化床内亚硝化过程的选择特性研究王志盈

32　120003西安建筑科技大学学报J.Xi’anUniv.ofArch.&Tech.Vol.32　No.1Mar.2000王志盈,刘超翔,袁林江,彭党聪(,710055)　:,,.:0.5～1.0mg/L(DO),DO,.NH+4-N300mg/L,NH+4-N20mg/L;90%,80%..:下向流内循环生物流化床;硝化;亚硝酸积累;废水生物脱氮:X52　　　　:A　　　　:1006-7930(2000)01-0004-04　　StudyontheselectionprocessofnitrificationunderlowdissolvedoxygeninbiofilminbiologicalfluidizedbedWANGZhi-ying,LIUChao-xiang,YUANLin-jiang,PENGDang-cong(SchoolofEnvir.&Civic.Eng.,Xi'anUniv.ofArch.andTech.,Xi'an710055,China)Abstract:Adownflowbiologicalfluidizedbedreactor(DBFB)wasusedtodiscussthestabilityofnitrificationthroughnitriteunderlowconcentrationofdissolvedoxygen(DO).Theexperimentresultsshowedthatthenitriteaccumulationwasstabebydynamicselectionunderthelimitingsubstrateofgrowth(DO).WhenDOconcentrationwas0.5～1.0mg/LandinfluentNH+4-Nconcentrationwas300mg/L,theeffluentNH+4-Nconcentrationwaslowerthan20mg/Landitsremovalefficiencymorethan90%;theeffluentNO-2-Nconcentrationcouldreachashighas220～240mg/LandNO-2-N/(NO-2-N+NO-3-N)wasabove80%stably.TheMPNtestshowedthatnitrosomonasdominatedinthebiofilmafteraccomplishmentofselectionunderlowDOlevels.Keywords:downflowbiologicalfluidizedbed;nitrification;nitriteaccumulation;biologicalnitrogenremoval()——、——、、、——.,.,、、(DO).,[1].,,,:1999-09-05:(59878042):(1942-),,,.DOI:10.15986/j.1006-7930.2000.01.002,[2].,DO,、、.图1　降低溶解氧对生物膜硝化的影响1　研究方法()2　结果与讨论2.1　2.1.1　选择前期(1.4kg/m3.d)(10%),300mg/L,,,0.5～1.0mg/L,、1.1.0mg/L,90%,10mg/L30～45mg/L,,9,160mg/L.,.,.,,,,,.,.,[3,4].,,,,,,.图2　稳定期系统硝化情况2.2.2　选择期15,,,200mg/L,60～70mg/L,80%.,,.,,,.2.2.3　稳定期30(2),210～230mg/L,82%～86%,..,220～240mg/L,80%,30mg/L,51　　　　　　　　　:图3　稳定期降低进水浓度对系统硝化的影响90%.,,,.,DO0.8～1.0mg/L,,15mg/L,80%,.,DO0.5～1.0mg/L,,,3.,10mg/L,98%,,84%76%,40～50mg/L.,.,,(0.5～1.0mg/L),,Garrido[2].2.3　1.1　　DO/mg·L-1　/mg·L-1·h-112.04322.012032.011540.5～1.09250.5～1.013　　:.1,43mg/L·h92mg/L·h,2,,,.(115mg/L·h120mg/L·h),,.13mg/L·h,92mg/L·h,,.,;,,,,——.,NH+4-NNO-2-N,NO-2-N.2　/·mL-13×1081×1081×1096×1072.4　,2.、,3,2/5,,,,,6　　　　　　　　　　　　　　　　　　　　　32.,75%94%,,,.3　结论(1)300mg/L,0.5～1.0mg/L,30d,80%,90%.,.(2),,.(3),3,2/5.,,.:[1]　.[M].:,1993.[2]　GARRIDOJM,etal.Influenceofdissolvedoxygenconcentrationonnitriteaccumulationinabiofilmairliftsuspensionreactor[J].Biotech&Bioeng,1997,53:168-179.[3]　HANAKIK,etal.Nitrificationatlowlevelsofdissolvedoxygenwithandwithoutorganicloadinginasuspended-growthreactor[J].WaterRes,1990,24:379-402.[4]　LAANBROEKHJ,etal.CompetitionforlimitingamountsofoxygenbetweenNitrosomonaseuropaeaandNitrobacteriawinogradskyigrowninmixedcontinuouscultured[J].ArchMicrobiology,1993,159:453-459.(上接第3页)3　结论(1),,,,.(2),,,,.(3),,.:[1]　VOETJP,etal.Removalofnitrogenfromhighlynitrogenouswastewater[J].JWPCF,1975,47:394-398.[2]　.[R].:,1996.[3]　ALLEMANJE.Elevatednitriteaccurencinbiologicalwastewatertreatmentsystem[J].WaterSciTech,1984,17:409-419.[4]　SUTHERSONS,etal.Inhibitionofnitriteoxidationduringnitrification:someobservations[J].WaterPollutResJCan,1986,21:257-266.[5]　TURKO,MAVINICDC.Maintainingnitritebuild-upinasystemacclimatedtofreeammonia[J].WaterRes,1989,23(22):1383-1388.[6]　ANTHONISENAC,etal.Inhibitionofnitrificationbyammoniaandnitrousacid[J].JWPCF,1976,48:835-850.71　　　　　　　　　: