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污泥停留时间对膜生物反应器中溶解性微生物产物和膜污染的影响.docx

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污泥停留时间对膜生物反应器中溶解性微生物产物和膜污染的影响 Title:EffectsofSludgeRetentionTimeonDissolvedMicrobialProductsandMembraneFoulinginMembraneBioreactors Abstract: Membranebioreactors(MBRs)havegainedsignificantattentionforwastewatertreatmentduetotheirsuperiorperformanceinsolidsandmicroorganismretention.However,membranefoulingremainsamajoroperationalchallengeinMBRsystems.Thisstudyinvestigatestheimpactofsludgeretentiontime(SRT)ontheproductionofdissolvedmicrobialproducts(DMPs)andmembranefoulinginMBRs.ThefindingsprovidevaluableinsightsintooptimizingtheSRTforenhancedMBRperformanceandreducedfouling. Keywords:membranebioreactors,sludgeretentiontime,dissolvedmicrobialproducts,membranefouling,wastewatertreatment 1.Introduction: Membranebioreactors(MBRs)havegainedpopularityforwastewatertreatmentduetotheircompactdesignandexcellenteffluentquality.However,membranefoulingisacriticalissuethatlimitsthelong-termoperationofMBRsystems.Foulingismainlycausedbytheaccumulationofdissolvedmicrobialproducts(DMPs),includingextracellularpolymericsubstances(EPS),solublemicrobialproducts(SMP),andsolubleextracellularenzymes(SEE),onthemembranesurface.Thesludgeretentiontime(SRT)inMBRsplaysacrucialroleintheproductionandaccumulationofDMPs,whichdirectlyaffectsmembranefouling.ThispaperaimstoinvestigatetheinfluenceofSRTonDMPproductionandmembranefoulingtooptimizeMBRoperation. 2.SludgeRetentionTimeandDMPProduction: TheSRTinMBRscanbeadjustedbycontrollingthesolidsretentiontime(SRT)orhydraulicretentiontime(HRT).StudieshaveshownthatanincreaseinSRTgenerallyleadstohigherDMPconcentrationsintheMBRsystem.Thisisattributedtolongercontacttimebetweenmicroorganismsandwastewater,promotingmicrobialgrowthandmetabolism.HigherDMPconcentrationscanenhancemembranefoulingbyincreasingtheconcentrationoffoulantsonthemembranesurface.Additionally,alongerSRTmayresultintheaccumulationofinertandnon-degradablesubstances,furthercontributingtomembranefouling. 3.InfluenceofSRTonEPSProduction: EPS,amajorcomponentofDMPs,isknowntocontributesignificantlytomembranef