INDUSTRIALWATER&WASTEWATERVol.40No.2Apr.,2009,,,(,510006)、、、[1-2]。,,。,,,。[3],。,:2009-01-08:,(DO1.0~1.5mg/L)、。:,COD88.2%79.3%;,24,,165.48163.04mg[O2]/(g[MLVSS]·h);EPS,EPS。EPS60.05mg/g[MLVSS]2630.77mg/g[MLVSS],EPS34.84mg/g[MLVSS]2626.88mg/g[MLVSS];021N。:;;:X703;X172:A:%1009-2455(2009)02-0042-04CharacteristicoffilamentousbulkinginbiofilmreactorunderlowDOconditionwhentreatingwastewaterCHENGKe-hong,MAYong-wen,WANJin-quan,WANGYan(CollegeofEnvironmentalScienceandEngineering,SouthChinaUniversityofTechnology,Guangzhou510006,China)Abstract:Biologicalcontactoxidationreactorwasusedtotreatsimulantwastewater,theinfluenceoffilamentousbulkingonoperationeffect,biofilmactivityandextracellularpolymericsubstancesinthereactorunderlowDOcondition(massconcentrationofDOwas1.0-1.5mg/L)wasinvestigated.Theresultsshowedthat:afterthefilamentousbulkingoccurred,theremovalrateofCODdecreasedfrom88.2%to79.3%,thebiofilmactivitywashigherthanthatinthenormaloperationperiod.Thebiofilmactivityinthetwostagesofoxidationtankbothreachedthemaximumvalue,whichwere165.48and163.04mg[O2]/(g[MLVSS]·h)respectivelyatthe24thday;TheEPScontentofthebiofilmwaslowerthanthatinthenormaloperationperiodmainlybecauseofthedecreaseofpolysaccharidecontentinEPS.TheEPScontentdecreasedfrom60.05to30.77mg/g[MLVSS]inthefirststageoxidationtankandfrom34.84to26.88mg/g[MLVSS]inthesecondstageoxidationtankatthe26thday;thepreponderantfilamentousbacteriumweretype021NandThiothrixsp..Keywords:filamentousbulking;biofilmprocess;lowdissolvedoxygen·42·,、。11.1(1)、、。,38L,2,。,。。8h,2.5~3.5mg/L,20~28℃。,。1.2。m(COD)∶m(N)∶m(P)=100∶5∶1,:ρ(C6H12O6)=0.559g/L,ρ(CO(NH2)2)=0.045g/L,ρ(KH2PO4)=0.02g/L,ρ(NaHCO3)=0.019g/L,ρ(MgSO4·7H2O)=0.027g/L,ρ(FeCl3·H2O)=0.01g/L,ρ(CaCl2)=0.012g/L,ρ(MnSO4·H2O)=0.002g/L,ρ(ZnCl2)=0.005g/L。COD319~425mg/L。1.3CODXJ-15COD;SOURDO;-[4-5],-[6],[6],;JNOECXS-212-103。:①5mL,--,38℃24h,。②100~100000,1mL,15mLLB,,28℃3~5d。,,。Eikelboom。22.1,2d,COD,,16d,COD86%,,。20d,,1.0~1.5mg/L。24,,,。,,,。,,,,。2,(a),(b),(c)。2.2,3。,,,,COD63%42.8%,65.6%47.8%,COD1Fig.1Experimentaldevice1234512345,,,:·43·INDUSTRIALWATER&WASTEWATERVol.40No.2Apr.,200988.2%68.9%。,,,57.4%,51.2%,79.3%。2.3。,,,。[7-8],(ATP)、、(SOUR)3。SOUR。4,,。24,,165.48mg[O2]/(g[MLVSS]·h),163.04mg[O2]/(g[MLVSS]·h)。,,,,。2.4、(EPS),EPS,,[9]。EPS、、、、,EPS,。EPS。5、6,,EPS。EPS92%,,67.2%,EPS60.05mg/g[MLVSS]2630.77mg/g[MLVSS];EPS78.4%,71.7%,EPS34.84mg/g2Fig.2Microscopepictureofbiofilminfilamentousbulkingprocess3CODFig.3RemovalrateofCODinbiologicalcontactoxidationtank48121620242832/d100806040200COD/% 4Fig.4Influenceoffilamentousbulkingonbiofilmactivity48121620242832/d20016012080400/(mg[O2]·g-1[MLVSS]·h-1)·44·[MLVSS]2626.88mg/g[MLVSS]。EPSEPS,,,。,,,。2.5,,,。,。30,。。Eikelboom,。。,,021N。3(1),COD88.2%79.3%。(2)。24,,165.48mg[O2]/(g[MLVSS]·h),163.04mg[O2]/(g[MLVSS]·h)。(3),EPS92%67%,EPS60.05mg/g[MLVSS]2630.77mg/g[MLVSS];EPS78.4%71.7%,EPS34.84mg/g[MLVSS]2626.88mg/g[MLVSS],EPS。(4),021N。:[1],,,.[J].,2007,24(2):66-67.[2],,,.[J].,2000,15(4):6-7.[3],.[J].,2004,20(6):99-101.[4],,,.[J].,2005,21(8):91-93.[5],,,.[J].,2007,1(4):127-130.[6].[M].:,1994.[7],,,.[J].,2003,16(1):37-39.[8],,.[J].,2004,10(5):647-650.[9]LiuH,FangHHP.Extractionofextracellularpolymericsubstan-ces(EPS)ofsludges[J].JournalofBiotechnology,2002,95(3):249-256.:(1984-),,,,,()ckehong@126.com;(1966-),,,,,,()020-87114970()ppywma@scut.edu.cn。5EPSFig.5InfluenceoffilamentousbulkingonEPSinfirststageoxidationtank48121620242832/d100806040200EPS/(mg·g-1[MLVSS])6EPSFig.6InfluenceoffilamentousbulkingonEPSinsecondstageoxidationtank48121620242832/d6050403020100EPS/(mg·g-1[MLVSS]),,,:·45·