低温条件下MUCT工艺污泥膨胀的产生与控制王晓玲

41　420094　　　　　　　　　JOURNALOFHARBININSTITUTEOFTECHNOLOGY　Vol.41No.4Apr.2009　　　　　　MUCT王晓玲1,2,尹　军1,2,叶　龙2,吴相会2(1.,150090,[e-mail];2.,130021)　:为进一步探讨丝状菌污泥膨胀的影响因素和建立控制策略,以MUCT工艺为研究对象,考察低温对活性污泥沉降性能的影响及相应的污泥膨胀的控制措施.结果表明:当系统的反应温度低于15℃时,Microthrixparvicella大量生长繁殖,改变了活性污泥的结构,发生污泥膨胀,SVI值最高达到381mL/g;通过采取控制系统的反应温度为25±1℃、污泥龄减少至6d、硝化液回流比α减小为2.5以及混合液回流比γ增大为1等措施可有效抑制Microthrixparvicella的生长繁殖,提高污泥的沉降性能,经过36d的运行,使SVI值降至127mL/g;膨胀期与恢复期系统对COD、TP的去除效果较好,而且膨胀期对TN的去除效果也较好,但在恢复期则因污泥龄的降低而明显下降.:MUCT工艺;污泥膨胀;反应温度;污泥龄:X703.1:A:0367-6234(2009)04-0067-05OccurrenceandcontrolofsludgebulkingunderlowtemperatureinMUCTprocessWANGXiao-ling1,2,YINJun1,2,YELong2,WUXiang-hui2(1.SchoolofMunicipalandEnvironmentalEngineering,HarbinInstituteofTechnology,Harbin150090,China,[e-mail];2.SchoolofMunicipalandEnvironmentalEngineering,JilinArchitecturalandCivilEngineeringInstitute,Changchun130021,China)Abstract:Inordertofurtherfindoutthefactorscausingsludgebulkingandestablishthecorrespondingcon-trolstrategies,theeffectoflowtemperatureonsludgesettlingcharacteristicsandthecontrolstrategiesforin-hibitingthegrowthoffilamentousbacteriawereinvestigatedbasedonMUCTprocesses.Theresultsshowthatthesludgebulkingoccursinthereactorduetothealterationofactivatedsludge'sstructureatthereactiontemperaturebelow15℃,whichresultsintheexcessivegrowthofmicrothrixparvicella,andthemaximumSVIvaluereaches381mL/g.Theexcessivegrowthofmicrothrixparvicellacanbeefficientlyinhibitedbycontrol-lingthereactiontemperatureat25±1℃,decreasingSRTto6days,anddecreasingthenitraterecirculationratioαto2.5orincreasingthemixedliquorrecirculationratioγto1.TheSVIvalueisdecreasedto127mL/gaftertheoperationfor36days.ThegoodremovalefficienciesofCODandTPareachievedduringthebul-kingandreestablishingperiods.TheremovalefficiencyofTNisalsogoodduringthebulkingperiods,buttheadverseresultisthatitsremovalrateisreducedwiththedecreaseofSRTduringthereestablishingperiods.Keywords:MUCTprocess;sludgebulking;reactiontemperature;sludgeretentiontime:2007-10-11.:(863-2004601020-03).:(1977—),,;　(1954—),,,.　　,(BNR)[1-3].BNR:BNR,[4-10].,BNR.、,、、、、、DO、、,[11].,SBR、A/O、、pH,[12-14].,BNR,MUCT.1　实　验1.1　MUCT1.,,90L,3,(18L)、(27L)、(45L).:2,3,5.,.,.,.、α(52)、γ(11)s.10L/h.pH7,DO2～4mg/L[15].θc,Zhu[16].1　MUCT1.2　(SVI),SVI150mL/g,,.COD、TP、TN、NO3--N、SV%、MLSS、SVI、pH、、DO,..DO、pHWTW-pH/OXi340.1.3　,2.76mL/L、0.12g/L、0.03g/L、0.05g/L、0.01g/L、0.25g/L.1.　　　　　　1　　　　　　mg·L-1CODCrBOD5NH4+-NTNTP/280.8/187.2215.4/110.949.2/20.051.3/22.37.5/4.9269.3161.539.341.47.2　　.20065,.2,,.141d,.MUCT、、、2.2　MUCT/d/1～68α=2.5,γ=1,s=1,t=25℃/69～140α=2.5,γ=1,s=0.5,t=17～26℃,θc=15d/141～167α=3,γ=0.5,s=0.5,t=11～15℃,θc=15dⅠ/168～190α=2.5,γ=1,s=0.5,t=19～22℃,θc=6dⅡ/191～204α=2.5,γ=1,s=0.5,t=25℃,θc=6d·68·　　　　　　　　　　　　　　　　　　　　　41　2　结果与讨论2.1　2141dMUCTSVI.2,SVI141d,146d173mL/g,166d381mL/g,.,,,,.,3.OlympusBX51,OlympusUplanFI40X,OlympusWHO10X,40×10.,———Loeffler.,,,“”.“”,、、.、SVI,.2　MUCTSVI　　Eikelboom,、,[17].Microthrixparvicella.,、,(0.3～0.5μm/d),,200～500μm,,COD.:12～15℃(),0.2kg-BOD/(kgMLSS·d),DO,(40%).,SVI250mL/g,490mL/g.20℃,0.2kgBOD/(kgMLSS·d),Microthrixparvicella30～80μm,15dSVI150mL/g;0.2kgBOD/(kgMLSS·d),12～15℃,,10～11dSVI150mL/g[3,18,19].3　　　MicrothrixparvicellaMUCT,2:①15℃,.MUCT20065,,25±1℃.,,.,,17～26℃,、,.,,.,10℃,141d15℃.0.08～0.16kgBOD/(kgMLSS·d),15d,,Microthrixparvicella.MUCT,,,.②α,.2,,α3,.α,·69·4,:MUCT,,,,,Microthrixparvicella.,α,;γ,,COD,COD.,αγ,Microthrixparvicella.2.2　Microthrixparvicella,,:①.15℃Microthrixparvicella,Microthrixparvicella.②.Microthrixparvicella,,.③α.α,,.④γ.γ,COD,COD,.2,SVI2.2,,36d,SVI166d381mL/g204d127mL/g.Ⅰ,.2,ⅠSVI381mL/g246mL/g,257～238mL/g.:,11,,1℃,122℃319℃,122℃,,519℃.Microthrixparvicella,.,Microthrixparvicella,Ⅱ.25±1℃.,SVI,204d127mL/g,.2.3　COD、TN、TP,3h,Microthrixparvicella,,,,MUCTCOD、TP,,4,5.COD187.16～280.80mg/L,5.53～22.58mg/L,92.4%～98.3%;TP4.91～7.45mg/L,0.04～0.31mg/L,87.4%～98.03%.4　COD　　6TN.6,TN,.TN35.25～43.36mg/L,6.32～11.13mg/L,74.27%～82.05%.(6d),TN,TN24mg/L,42.24%,.5　TP·70·　　　　　　　　　　　　　　　　　　　　　41　6　TN3　结　论1)MUCT146d,SVI173mL/g,,SVI,166d381mL/g.2)Eikelboom,,Microthrixparvicella.Microthrixparvicella,15℃,α.3)、6d、α2.5γ1SVI127mL/g,.4),,,.参考文献:[1]　TSAIMW,WENTZELMC,EKAMAGA.TheeffectofresidualammoniaconcentrationunderaerobicconditionsonthegrowthofMicrothrixparvicellainbi-ologicalnutrientremovalplants[J].WatRes,2003,37:3009-3015.[2]　WAGNERM,LOYA.Bacterialcommunitycomposi-tionandfunctioninsewagetreatmentsystems[J].CurrOpinBiotechnol,2002,13(3):218-227.[3]　,.[J].,2006,38(6):887-892.[4]　XIEB,DAIXC,XUYT.Causeandpre-alarmcontrolofbulkingandfoamingbyMicrothrixparvicella—Acasestudyintripleoxidationditchatawastewatertreatmentplant[J].JournalofHazardousMaterials,2007,143:184-191.[5]　SCRUGGSCE,RANDALLCW.Evaluationoffila-mentousmicroganismgrowthfactorsinanindustrialwastewateractivatedsludgesystem[J].WatSciTech,1998,37(4-5):262-270.[6]　MADONIP,DAVOLID,GIBING.Surveyoffila-mentousmicroorganismsfrombulkingandfoamingac-tivated-sludgeplantsinItaly[J].WatRes,2000,34(6):1767-1772.[7]　,,.[J].,2006,7(5):1-9.[8]　MARIAR.Operationwithbiologicalnutrientremovalwithstablenitrificationandcontrolo