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强化生物除磷系统中聚磷菌和聚糖菌的竞争研究进展.docx

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强化生物除磷系统中聚磷菌和聚糖菌的竞争研究进展 Title:ResearchProgressonCompetitionsbetweenPolyphosphate-AccumulatingBacteriaandGlycogen-AccumulatingBacteriainEnhancedBiologicalPhosphorusRemovalSystems Introduction: Phosphorusisanessentialnutrientformicrobialgrowthandisamajorcontributortoeutrophicationinaquaticecosystems.Enhancedbiologicalphosphorusremoval(EBPR)systemsarewidelyusedtoremovephosphorusfromwastewaterthroughtheassimilationofphosphatebyspecificmicroorganisms.Amongthesemicroorganisms,polyphosphate-accumulatingbacteria(PAOs)andglycogen-accumulatingbacteria(GAOs)playcriticalrolesinthephosphorusremovalprocess.UnderstandingthecompetitionsbetweenPAOsandGAOsisvitalforoptimizingtheperformanceofEBPRsystems.ThispaperaimstoprovideanoverviewoftheresearchprogressonPAOs-GAOscompetitionsinEBPRsystems. 1.CharacteristicsandmetabolicpathwaysofPAOsandGAOs 1.1Polyphosphate-accumulatingbacteria(PAOs):PAOsutilizepolyphosphate,whichisstoredintracellularly,asameanstoremovephosphorusfromtheenvironment.Theyprimarilyaccumulatepolyhydroxyalkanoates(PHAs)asasourceofcarbonandenergyforgrowth. 1.2Glycogen-accumulatingbacteria(GAOs):GAOsaccumulateglycogenasthemainstoragecompoundinsteadofpolyphosphate.Theyusevolatilefattyacids(VFAs)ascarbonsourcesfortheirgrowthandmetabolism. 2.FactorsinfluencingcompetitionsbetweenPAOsandGAOs 2.1Carbontophosphorus(C/P)ratio:PAOshaveahigheraffinityforphosphorusuptakeandstoragethanGAOsunderlowC/Pratios.GAOsthriveinhigherC/Pratiosduetotheirabilitytostoreexcesscarbonasglycogen. 2.2Aerationconditions:AerobicconditionssignificantlyfavorthegrowthofPAOsbecausetheyconsumemoreoxygenduringtheuptakeandstorageofphosphorus.GAOsaremorecompetitiveunderanoxicandanaerobicconditions. 2.3Temperature:HighertemperaturespromotethegrowthofGAOs,whilelowertemperaturesfavorPAOs.TemperatureaffectsthemetabolicpathwaysofbothPAOsandGAOs,thusinfluencingtheircompetitiveness. 2.4Shearstress:HighshearstressinthereactorcannegativelyaffectPAOsduetotheirlargercellsizecomparedtoGAOs.GAOshaveacompetitiveadvantageinhigh