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MBR膜污染过程中微生物群落结构与代谢产物分析.docx

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MBR膜污染过程中微生物群落结构与代谢产物分析 Abstract： MBR(MembraneBioreactor)technologyiswidelyusedinwastewatertreatment.Inthispaper,wereviewthemicrobialcommunitystructureandmetabolicproductsduringMBRmembranefoulingprocess.ItishelpfulforunderstandingthemechanismofmicrobialcommunitystructurechangesintheMBRmembranefoulingprocessandprovidesatheoreticalbasisfortheoptimizationoftheMBRoperationandmaintenance. Introduction： Wastewatertreatmentisacomplexprocessinvolvingtheremovalofvariousimpuritiesandpollutantsfromwastewater.OneofthecommonmethodsusedinthetreatmentofwastewateristheuseofMBR(MembraneBioreactor)technology,whichcombinesactivatedsludgetechnologywithmembraneseparationtechnology.Duetothegoodtreatmenteffect,lowenergyconsumption,andsmalllandoccupation,theMBRtechnologyhasreceivedwideattentioninthewastewatertreatmentfield. However,duringtheoperationofMBRsystems,thephenomenonofmembranefoulingoftenoccurs.Membranefoulingreferstotheaccumulationofsuspendedsolids,organicmatter,andmicroorganismsinthemembranesurface,whichcausesthedecreaseofwaterfluxandtheincreaseofmembraneresistance.ThemembranefoulingseriouslyaffectstheefficiencyoftheMBRsystem,increasestreatmentcostsandleadstothedecreasedservicelifeofthemembrane. ThesecondarysludgemetabolitesformedduringtheMBRprocesshaveasignificantimpactonmicrobialcommunitystructureandmembranefouling.Inthispaper,wewilldiscussthemicrobialcommunitystructureduringtheMBRmembranefoulingprocessandthemetabolicproductsgeneratedbymicroorganisms. MicrobialcommunitystructureduringtheMBRmembranefoulingprocess： Themicrobialcommunitystructureisaffectedbymanyfactors,suchaswastewatercomposition,temperature,pHvalue,dissolvedoxygen,andorganicloadingrate.DuringtheMBRmembranefoulingprocess,thecompositionofmicroorganismsinhabitingthemembranechanges,andthenumberofdifferentmicrobialspeciespresentalters.Thecompetitionbetweendifferentmicrobialspeciesandmicrobialmetabolicactivityistheprimaryfactorthataffectsthemicrobialcommunitystructure. Asthemembranefoulingprogresscontinues,thenumberof