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温度对A~2O工艺脱氮速率及胞外聚合物影响.docx

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温度对A~2O工艺脱氮速率及胞外聚合物影响 Introduction Inthebiologicaltreatmentsystems,nitrogenremovalprocessesareofutmostimportanceduetotheharmfuleffectsofexcessnitrogeninwastewaterdischargetotheenvironment.TheA~2Oprocessisawidespreadnitrogenremovalprocessconsistingofanoxic,anaerobicandaerobicstagesinsequence.Theprocessisknowntobeefficientinnitrogenremovalandbiomassretention.However,thenitrogenremovalrateandextracellularpolymericsubstancesintheA~2Oprocessareaffectedbytemperaturevariations.ThispaperaimstoinvestigatetheimpactsoftemperatureonnitrogenremovalrateandextracellularpolymericsubstancesintheA~2Oprocess. FactorsaffectingA~2Oprocess TheA~2Oprocessisacomplexbiologicalprocessthatisaffectedbyawiderangeoffactorsincludingtemperature,pH,oxygenavailability,andsubstrateconcentration.Amongthesefactors,temperatureisknowntohaveasignificantimpactonthebiologicalprocessesoftheA~2Oprocess. TemperatureandNitrogenRemovalRate TemperatureaffectstherateofbiologicalreactionsintheA~2Oprocess,whichinturn,affectsthenitrogenremovalrate.Generally,highertemperaturespromotethegrowthandmetabolismofmicroorganisms,whichenhancesthenitrogenremovalrate.TheoptimumtemperaturerangefortheA~2Oprocessisbetween20-30°C(Lietal.,2015).Belowthistemperaturerange,thenitrogenremovalratemayslowdown,whileabovethisrange,thepossibilityofinhibitingthemicroorganisms'growthexists,leadingtoadeclineinnitrogenremovalefficiency.Therefore,carefulmonitoringandcontroloftemperatureareessentialduringtheA~2Oprocesstoensureoptimalperformance. TemperatureandExtracellularPolymericSubstances Extracellularpolymericsubstances(EPS)playasignificantroleintheoperationofbiologicalwastewatertreatmentplants.TheEPSproducedbymicroorganismsactasaglue-likesubstanceduringtheformationofbiofilms,whichenablestheretentionandgrowthofmicroorganismsinthereactor.EPSalsoinfluencesthesettlingcharacteristicsofbiomass,andthus,affectsthesedimentationefficiencyoftheprocess.Temperatureaffectstheproduction,composition,andstructureofEPSintheA~2Oprocess. Studieshaveshownthathighe