CAST工艺处理低CN生活污水的强化脱氮性能马娟

3　2环境工程学报Vol.3,No.220092ChineseJournalofEnvironmentalEngineeringFeb.2009CASTC/N马　娟1,2　彭永臻1＊　王淑莹1　王　丽1　王少坡1,3(1.,100022;2.,730070;3.,300384)　　CASTC/N,pHORP。,4h,C/N,TN;C/N,TN,,16%,。,A/O,TN,487.23%。,、pHORP,、。　　　CAST　X703.1　　　A　　　1673-9108(2009)02-0234-05EnhancingnitrogenremovalperformanceofCASTforlowratioofC/NmunicipalwastewatertreatmentMaJuan1,2　PengYongzhen1　WangShuying1　WangLi1　WangShaopo1,3(1.KeyLaboratoryofBeijingforWaterQualityScienceandWaterEnvironmentRecoveryEngineering,BeijingUniversityofTechnology,Beijing100022;2.InstituteofEnvironmentalandMunicipalEngineering,LanzhouJiaotongUniversity,Lanzhou730070;3.DepartmentofEnvironmentalandMunicipalEngineering,TianjinInstituteofUrbanConstruction,Tianjin300384)Abstract　ThenitrogenremovalperformanceofCASTtreatinglowC/NwastewaterunderdifferentoperationconditionswasinvestigatedandtheprofilesofpHandORPwereanalyzed.TheresultsshowedthatTNremovalratecouldn'tbeimprovedbyincreasingtheC/Nratioofwastewaterwhenthesystemoperatedintraditionalmold.DecreasingthefillingratioofwastewaterwashelpfulforincreasingTNremovalrate,whilesludgebulkingandnitrateaccumulationhappenedbecauseoftheoperationunderlong-termconditionoflowcarbonsourceandincompletedenitrificationwhenthefillingratiowas16%.Nitrogenremovalefficiencycouldbegreatlyenhancedbyalternatinganoxic-aerobicprocesswithstepfeedingwithoutaddingexternalcarbonsource,anditwasin-creasedbyincreasingfeedfrequencywiththemaximumvalueof87.23%.Whenreal-timecontrolstrategywasemployed,thejudgmentontheendingofnitrificationanddenitrificationcouldbebasedontheinflectionpointonthevariedcurveofORPandpHduringorganicdegradation,ammoniaoxidationandnitratereduction,andthusreducingaerationandmixingtimeforthepurposeofenergysaving.Keywords　biologicalnitrogenremoval;municipalwastewater;cyclicactivatedsludgetechnology:“”(2006BAC19B03);(EDBS07/1-53974082);(ykj-2007-1497);:2008-06-15;:2008-06-30:(1978～),,,,:。E-mail:[e-mail]＊　　,[1]。,,。,22。CASTSBR,、,,2　:CASTC/N,CAST,[2～4]。,CAST,,,,、,,[5]。DO、ORPpH,,,,[6～10]。,CAST,。CASTC/N,DO、ORPpH,pHORP,、。1　1.1　CAST1。24L,18L,。,。1　CASTFig.1　SchematicdiagramofCASTprocess3,2。1,4h,(33%、25%16%),20%。2,(25%)(20%),A/O(/)。3,(25%)(20%),A/O。SV、SVI、MLSS、NH+4-N、NO-2-N、NO-3-NCOD,DO、ORPpH。2　CASTFig.2　OperationmodeofCASTprocess1.2　2,1C/N,C/N2.8;2C/N,,C/N5.7(C/N)。22～25℃,pH7.15～7.7,200～420mg/L。1.3　NH+4-N;NO-3-N;NO-2-NN-(1-);COD5B-3;TNMultiN/C3400TOC;DO、ORPpHWTWMulti340i;、MLSS、VSS[11]。2　2.1　,2,1,,MLSS4000mg/L,。,,COD50mg/L、NH+4-N95%。,3mg/L。2.2　2.2.1　不同进水C/N比下的污染物去除情况和污泥沉降效果34h2C/N。3,C/N23532.85.7SVI148141mL/g,,TN,TN;,,1mg/L,,,,,TN(72.16%),TN60.73%。,C/N,,,。3　C/NFig.3　EffectofC/NratioonCOD,nitrogenremovalperformanceandSVIoftraditionalmode2.2.2　不同充水比下的污染物去除情况和污泥沉降效果4,CAST。,TN,m33%、25%16%TN60.73%、72.51%81.38%。,,33%25%2,SVI148155mL/g,,MLSS3500mg/L;16%,SVI241mL/g,11d,SS,MLSS1000mg/L。,,,TN,(F/M),,[12～15],SVI。,Casey[16]F/M,NON2OO,。,,,NON2O。,,,。,216%。4　Fig.4　EffectoffillingratioonCOD,nitrogenremovalperformanceandSVIoftraditionalmode2.2.3　分段进水的污染物去除情况和污泥沉降效果,CAST。5。5,,,2、34TN81.29%、83.87%87.23%,,SVI。,,TN,TN,C/N,;,,SVI。,6A/O4pH、ORPCODNH+4-N、NO-2-N、NO-3-N(“”)。5,1,,pH,ORP;,,pH,ORP。62362　:CASTC/NORP,:,,,,,。,,,DO,DO,。ORP,。:①,,,,ORP;②,ORP[17]。34,pH(NP1NP2),“”,。2“”。pHCO2。H+,pH,,CO2pH[18]。,,。pH,,,pHORP,pHORP“”“”[19]。,,pHORP,。2.2.4　交替A/O的实时控制系统运行7、pHORP。7pH“”,NP1、NP2NP3。ORP,(NO-x-N)N2,,,ORP,,,ORP。,15min,,15minpHORP,,,,pH,,CO2,CO2。,C/N,pH,。pHORP,pHORP“”,。,,,TNA/O。C/N,,,,F/M。,,,23737　、pHORPFig.7　COD,nitrogentransformationandprofilesofpHvalue,ORPduringreal-timecontrolmode。3　　(1)4h,TN;C/N,16%,。(2)A/OCASTC/N,,,,,4TN87.23%。,,3。(3),pHORP,、。C/N,pH“”,,pH“”ORP“”。,。[1],..:,1998[2]GoronszyM.C.Thecyclicactivatedsludgesystemforre-sortareawastewatertreatment.Wat.Sci.Tech.,1995,32(9/10):105～114[3]GoronszyM.C.Co-currentnitrification/denitrificationandbiologicalP-removalincyclicactivatedsludgesystemplantsbyredoxcontrolledcycleoperation.Wat.Sci.Tech.,1997,35:215～224[4]MervynC.Goronszy,GunnarDemoulin,MarkNewland.Aerateddenitrificationinfull-scaleactivatedsludgefacili-ties.Wat.Sci.Tech.,1997,35(10):103～109[5]WangShao-po,PengYong-zhen,WangShu-ying,etal.Applyingreal-timecontroltoenhancetheperformanceofnitrogenremovalinCASTsystem.JournalofEnvironmentalSciences,2005,17(5):736～739[6]PengYong-zhen,GaoJing-feng,WangShu-ying,etal.UsepHandORPasfuzzycontrolparametersofdenitrifica-tioninSBRprocess.Wat.Sci.Tech.,2002,46(4/5):131～137[7]IngildsenP.,WendelboeH.Improvednutrientremovalu-singinsitucontinuouson-linesensorswithshortresponsetime.Wat.Sci.Tech.,2003,48(1):95～102[8],,,.ORPpH.,2003,35(6):647～650[9],,,.pHORPSBR.,2006,7(12):32～35[10],,,.SBR.,2007,27(1):62～66[11].(3).:,1997[12],,,.SBR.,2005,25(1):105～108[13],,,..,2004,5(6):54～58[14]MartinsA.M.P.,PagillaK.,HeijnenJ.J.,etal.Fil-amentousbulkingsludge—acriticalreview.WaterRes.,2004,38:793～817[15],..,2004,20(2):1～4[16]CaseyT.G.,WentzelM.C.,LoewenthalR.E.,etal.AhypothesisforcauseoflowF/Mfilamentbulkinginnu-trientremovalactivatedsludgesystem.WaterRes.,1992,26(6):867～869[17],,.SBR.,2002,18(11):13～18[18],,.DO、ORPpHSBR.,2001,17(4):6～11[19]KimJu