除磷系统剩余污泥中营养元素的快速释放及回收王怡

710055、。。SDS、pH9．5、400r/min。、、SDS、SDS24h。X703A1000－4602201211－0029－0451108368“”IRT0853RapidReleaseandRecoveryofNutrientElementsinExcessSludgefromBiologicalPhosphorusRemovalProcessWANGYiQUPeng-chengZHENGShu-jianPENGDang-congSchoolofEnvironmentalandMunicipalEngineeringXi’anUniversityofArchitectureandTechnologyXi’an710055ChinaAbstractExcesssludgefrombiologicalphosphorusremovalBPRprocessusuallyreleasesphosphoruswhenthesludgeisthickenedstoredandsubsequentlytreatedwhichalwaysleadstophos-phorusoverloadinarunningwastewatertreatmentplantandresultsinunstabledischargeofeffluentphos-phorus．BasedontheanalysisofchemicalcharacteristicsofexcesssludgefromBPRprocesstherapidreleaseandrecoveryofnutrientelementsinexcesssludgewereinvestigated．Bench-scaleexperimentsofanaerobichydrolysisundermesothermalconditionwerecarriedoutintwoidenticalreactors．OnereactorservedascontrolandtheotherwasfilledwithsodiumdodecylsulfateSDS．ThenutrientelementsinthehydrolysatewererecoveredbystruvitecrystallizationunderroomtemperaturepHvalueof9．5andmixingspeedof400r/min．TheresultsshowedthatexcesssludgefromBPRprocesswascharacterizedbyhighphosphoruscontentrapidreleaseofphosphorusandslowreleaseofnitrogen．TheadditionofSDSwasbeneficialtoreleaseofnutrientelementsandtostruvitecrystallization．ItwassuggestedthatSDSshouldbeaddedfor24hoursofrapidhydrolysis．Thehydrolysislengthwasdeterminedbytheratioofni-trogenandphosphorusconcentrationaswellastimecost．·92·281120126CHINAWATER＆WASTEWATERVol．28No．11Jun．2012KeywordsexcesssludgefromBPRprocessnutrientelementrapidreleaserecovery、。、。。、1～3JiangSDS4。。11.1A2/O。、《》。1．5mm2。1SCOD、NH+4－N、PO3－4－P1#、2#、3#288、72、24hpH7．17、7．197．70。1Tab．1Parametersofelutriatedsludgeandsupernatantmg·L－11#2#3#TSS132361262015716VSS856878689694TCOD138121230814587SCOD35．4429．5734．71#2#3#NH+4－N7．523．0211．00TN672．76616．77848．01PO3－4－P9．9210．1818．00TP291．08258．65341．11.22SDS。13cm50cm3．5L。35±2℃。。。。pH。1.310000r/min10min。NH+4－NPO3－4－PPO3－4－P/Mg2+1∶1．3MgCl2·6H2O。1mol/LNaOHpH9．5400r/min30min45minNH+4－NPO3－4－P。1.4pHNH+4－NPO3－4－PCODSS、VSS。22.11VSS/SS0．629。VSS/SS0．7～0．8。VSS/SS0．75～0．85。1．560gCOD/gVSS1．42gCOD/gVSSTCOD∶TN∶TP100∶5．22∶2．18C5H7NO2P0．074100∶5∶15。2.22.2.1SDS、12d288h1。6dSDS·03·2811．watergasheat．com、。2PO3－4－PTP57．37%SDS72．06%NH+4－NTN15．1%SDS43．63%3。2dPO3－4－PPO3－4－PSDS8SDS、PO3－4、NH+4、Mg2+PO3－4。112dFig．1Releaseofnutrientelementsduringhydrolysisfor12daysSDS2d271．23%。SDS、。2.2.2、72h2。12hSDSPO3－4－PSDSPO3－4－PTP37．80%57．86%74．81%83．80%。NH+4－NNH+4－N48hSDS27．94%SDS。272hFig．2Releaseofnutrientelementsduringhydrolysisfor72hoursMg2++NH+4+PO3－4+6H2O→MgNH4PO4·6H2O、12．21。212h、、、SDS24h。2.32.3.124hPO3－4－PNH+4－N2。SDS、SDS。·13·．watergasheat．com28112Tab．2Recoveryresultofnutrientelementsfromsupernatantofhydrolysatemg·L－1SDSNH+4－N82．4843．7138．77PO3－4－P139．2910．27129．02SDSNH+4－N173．2109．1464．06PO3－4－P185．045．39179．65SDSPO3－4－P92．63%、97．09%47．00%、37．00%。NH+4－NPO3－4－PSDSPO3－4－PNH+4－N2．21。pHSDSPO3－4、NH+4PO3－4。2.3.224h3。SDS、、。324hFig．3Microscopicmorphologyofstruviteextractedfromsupernatantafterhydrolysisfor24hourspH6。pH9．5、SDS。StratfulSDS2．1。SDS、。3①SDS。、24h。②SDS。1TiehmANickelKZellhornMetal．UltrasonicwasteactivatedsludgedisintegrationforimprovinganaerobicstabilizationJ．WaterRes20013582003－2009．2VlyssidesAGKarlisPK．Thermal-alkalinesolubiliza-tionofwasteactivatedsludgeasapre-treatmentstageforanaerobicdigestionJ．BioresourTechnol2004912201－206．3YangQiLuoKunLiXiao-mingetal．Enhancedeffi-ciencyofbiologicalexcesssludgehydrolysisunderanae-robicdigestionbyadditionalenzymesJ．BioresourTechnol201010192924－2930．4JiangSuChenYinguangZhouQi．Effectofsodiumdo-decylsulfateonwasteactivatedsludgehydrolysisanda-cidificationJ．ChemEngJ20071321/3311－317．5DrosteRL．TheoryandPracticeofWaterandWastewaterTreatmentM．NewYorkJohnWiley＆SonsInc1997．6．J．2009292353－359．1971－。[e-mail]2012－01－04·23·2811．watergasheat．com