UASB反应器处理低温低浓度生活污水试验研究英文罗湘南

　46　　2007　6()ACTA　SCIENTIARUM　NATURALIUM　UNIVERSITATIS　SUNYATSENIVol.46　Sup.Jun.　2007　LowConcentrationDomesticWastewaterTreatedbyanUASBReactoratPsychrophilicTemperature①LUOXiangnan1,2,JIMin1,YANGJingliang2,ZHANGJing2(1.DepartmentofEnvironmentalScienceandEngineering,TianjinUniversity,Tianjin300072China;2.DepartmentofEnvironmentalScienceandEngineering,HebeiUniversityofScienceandTechnology,Shijiazhuang050018,China)Abstract:Theperformanceandthesludgecharacteristicsofanupflowanaerobicsludgeblanket(UASB)reactorwereinvestigatedforthetreatmentoflowconcentration(COD400～600mg·L-1)domesticwastewateratpsychrophilictemperature(15±1℃).Thela-boratory-scaleUASBreactorof2.0Lofusefulvolumewasoperatedforaperiodof174days.Anorganicloadingrateofaround3.0kg·m-3d-1wastreatedwitha30%～50%CODremovalrate.ThecharacteristicsofsludgeinUASBreactorwerechanged.Gran-ularsludgehasbeenobtainedinthereactorandwaswellsettelable.TheSEMphotoesofthesludgeduringtheexperimentshowedthatfilamentousbacteriumandbacilluswerekeyorganisms.Keywords:anaerobictreatment;UASBreactor;lowconcentrationdomesticwastewater;sludgecharacteristicsCLCnumber:X703　　Documentcode:A　　ArticleID:0529-6579(2007)S1-0009-02　　Anaerobictreatmentofwastewaterisatechniquewithrecyclinguseofenergyatlowcost.Generally,Modernhigh-tateanaerobicreactorsaretypicallyap-pliedtothetreatmentofhigh-strengthwastewaters(COD1000mg·L-1)inthemesophilictemperaturerange(25to40℃).ButdomesticwastewatershavetypicallyconcentrationofCODbelow1000mg·L-1andmanywastewatershavetemperatureslowerthanmesophilicrange(25℃).Successfulanaerobictreatmentofsuchwastewaterswithlowcostandenergyrequirementswouldhaveanimportantinfluenceonwastewatertreatment[1].Severalauthorsstudiedandobservedsomesuccessfulresultsinrecentyears[2-4].ThisexperimentdidelementarystudyontreatmentoflowconcentrationdomesticwastewaterbyusingUASBreactoratpsychrophilictemperature(15±1℃).1　Experiments1.1　Experimentalset-upThelaboratory-scaleUASBreactorwasmadeofor-ganicglass(volume,height,diameter:2.0L,74cm,5.2cm).Thetemperatureofthereactorscontentswascontrolledat(15±1)℃byabiochemicalincubator.1.2　ExperimentalwastewaterExperimentalwastewateristheartificialpreparedorganicwastewaterwithlowconcentration(COD400～600mg·L-1).1.3　SeedsludgeSeedsludgewasobtainedfromthedigestedpoolofwesternbridgesewagedisposalplantofShijiazhuang.Sludgepresentedfloccularandblack,withSSof90.33g·L-1andVSSof44.45g·L-1.1.4　AnalyticalmethodsDuringtheexperiment,pH,chamicaloxygende-mond(COD),suspendedsolids(SS),volatilesus-pendedsolids(VSS),volatilefattyacids(VFA)werecarriedoutusingtheStandardMethodsofChina.2　Resultsanddiscussion2.1　OperationofUASBreactorTheUASBreactorwasinoculatedwithmesophilicanaerobicsludge.Theorganicloadingrate(OLR)inthestart-upstagewas0.5kg·m-3d-1.IntheOLRrisingstage,theOLRwasraisedforthreetimesat0.5kg·m-3d-1.ThehighestOLRwas2.0kg·m-3d-1.Inthethirdstage,OLRwasraisedfortwotimesfrom2.0kg·m-3d-13.0kg·m-3d-1.CODremovalratewasaboved30%～50%.AsshowninFig.1,afullandstableconversioncapacityofpsy-chrophilicUASBsystemcanbeachievedwithin174days.①:2007-01-10:(04276704),(2005-125):(1971),,;:;E-mail:[e-mail]()46　Fig.1　OperationresultsoftheUASBreactorfortreatinglowconcentrationwastewaterat(15±1)℃.(△)removalrate(□)OLR2.2　sludgecharacteristicsDuingthecourseoftheexperiment,seedsludgebecamefloccularwithgoodsettlingcharacteristicandatlastbecamegranularsludge.CharacteristicsofthesludgewereobservedbySEMasshowninFig2.TheSEMphotoesofthegranularsludgeshowedthatfila-mentousbacteriumandbacilluswerekeyorganisms.Fig.2　SEMofthemicrobiosinsludge3　ConclusionsTheupflowanaerobicsludgeblanket(UASB)re-actorpresentedastableoperationandhighperformanceinthetreatmentoflowconcentration(COD400～600mg·L-1)domesticwastewateratpsychrophilictemper-ature(15±1)℃.Atpsychrophilictemperature,theob-servedincreasedactivityoffilamentousbacteriumandbacilluscouldbeduetogranularationofsludge.References:[1]　GATZEL,SALIHR,GRIETJEZ.Challengeofpsy-chrophilicanaerobicwastewatertreatment[J].TrendsinBiotechnology,2001,19(9):363-370.[2]　TAREKAE,KIMLTO,GRIETJEZ,etal.Treat-mentofdomesticsewageinatwo-stepanaerobicfilter/anaerobichybridsystematlowtemperature[J].WaterReasearch,2002,36:2225-2232.[3]　ALETTEAM.L,DAVIDCS.Treatmentofdilutewastewaterusingananaerobnicbaffledreactor:effectoflowtemperature[J].WaterReasearch,2000,35(15):3867-3875.[4]　NIDALM,GRIETJEZ,HUUBG.Anaerobicsewagetreat-mentinone-stageUASBreactorandcombinedUASB-diges-torsystem[J].WaterReasearch,2004,38:2347～2357.[5]　GATZEL,SALIHR,SOFIAP,etal.High-Ratean-aerobictreatmentofwastewateratlowtemperatures[J].AppliedandEnvironmentalMicrobiology,1999,65(4):1696-1702.UASB罗湘南1,2,季　民1,杨景亮2,张　静2(1.天津大学环境科学与工程学院,天津300072;2.河北科技大学环境科学与工程学院,河北石家庄050018)　:((15±1)℃)(COD400～600mg·L-1)UASB。,,UASB,2.0L,174。3.0kg·m-3d-1,COD30%～50%。,,。,。:;UASB;;:X70310