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1、PrincipleandCharacteristicsofReversedA2/OProcessAbstract：ThebiochemicalcharacteristicsofshorttimeretentioninanaerobiczoneandsequencereversingofanaerobicandanoxiczonesonphosphorusreleaseanduptakewerestudiedinbenchscaleexperimentsTheresultsshowedthat:(1)theeffectivephosph
2、orusrelease,fullyornot,isnotthesufficientandnecessaryconditiondecidingtheabilityofexcessPuptakeToacertainextent,arelativelylongerHRTandamoresufficientanaerobicenvironmentproduceastrongerpotentialofexcessPuptakeinthefollowingaerobiccondition(2)amuchbettereffectofN-Premov
3、alcanbeobtainedinbiologicalnutrientremovalprocessbyreversingthepositionofanaerobicandanoxiczonesandturningintoreversedA2/OprocessItsphosphorusandnitrogenremovalratesaremarkedlyhigherthanthatofconventionalA2/Oprocess,whereastheCODremovalratesareaboutequalKeywords:wastewa
4、ter;treatment;nitrogenremoval;phosphorusremoval;reversedA2/OprocessConventionalbiologicalnitrogenandphosphorusremovalprocessisanaerobic(A1)/hypoxia(A2)/aerobic(O)layout.Thelayoutofthetheorybasedonanunderstandingthat:Polyeffectivemicrobialphosphoruslevelsofphosphorusrele
5、ase,fullyornot,toimprovethephosphorusremovalcapacityisoftheutmostimportance,anaerobiczonesothattheformercanmicrobialpolymerandcarbonpriorityfullphosphorusrelease.However,theexistenceofinnerloop,Conventionaltechnologysystemsemitresidualsludgeactuallyonlyasmallpartofacomp
6、leteexperiencephosphorusrelease,theuptakeprocess,therestwerebasicallyanaerobicstatewithoutdirectaccessfromanoxicandaerobiczone,whichisdetrimentaltothephosphorusBecauseofthelackofoxygenislocatedinthecentralsystem,denitrificationcarbonallocationinanunfavorableposition,Itw
7、illaffectthenitrogenremovalsystem;Asanaerobicresidents,SludgebacktotheanaerobiczonenitratehaveanegativeimpactonInordertoavoidtheimpactofthedevelopmentofsomenewtechnology(suchasApplicationofUCTWell,etc.)tendstocomplicate;actualoperatingexperienceshowsthatAccordingtoanaer
8、obic-aerobictwodenitrificationprocessdesignsystemisalsooftenagoodphosphorusremovalcapacity.Therefore,theconven
