UNITANK工藝提高城市污水廠除磷率的研究.pdf

1、東南大學(xué)碩士學(xué)位論文UNITANK工藝提高城市污水廠除磷率的研究姓名：印宏申請(qǐng)學(xué)位級(jí)別：碩士專業(yè)：環(huán)境工程指導(dǎo)教師：呂錫武2001.6.1東南大學(xué)碩士學(xué)位論文ABSTRACTSThispaperexplorestheperformanceandmechanismofmunicipalwastewatertreatmentbyUNITANKreactorsSomeimportantfactorsareinvestigatedinthisr

2、esearch，suchasHydraulicRetentionTime(HRT)，lengthofeachphaseinacycle，watertemperature，SludgeRetentionTIme(SRT)MainreactionsineachphaseareanalyzedfromthecyclicvariationofwastewaterqualityintheUNITANKandtheimportanceofinter

3、imisfoundTosteadilyeliminatetheeffluentphosphorusbelowO5mg／L，experimentsarecarriedouttoseekthefeasibilityofdirectadditionofprecipitantintotheUNITANKThemainresultsaresummarizedasfollows：1TheoperationmodeofUNITANKisbenefic

4、ialtothegrowthofphosphateaccumulatingorganisms(PAO)Afterfifteendays’acclimationtheactivatedsludgereachesahigherremovalratethan80％forphosphateand86％forCOD2HydraulicRetentionTimeisanimportantfactoraffectingtheperformanceof

5、UNITANKTheeffluentqualitydeteriorateswhenHRTisbelow12handdoesnltimprovemuchwhenHRTishi曲erthan12h3TheconcentrationsofeffluentCOD、TPandNHfNvaryperiodicallyintheUNITANKduetoitscyclicoperation4Thelengthofmainphaseinacyclehas

6、lialeinfluenceonCODremovalTheextensionofmainphaseisadvantageousforPAOteleasephosphatefullyButtoolonglengthofmainphase，suchas210rainwillraisetheconcentrationofeffluentNH4_N5Lowtemperatureisdisadvantageoustomicroorganisms，

7、especiallytonitrifiersBelow3“C，nitrifiersstopitsactivityButPAOstillreachedahighphosphateremovalrateof8673％at4℃6ThelengthofinterimhasmuchinfluenceonnitrificationTPandNH4Nremovalratesreach816％and86％respectivelywiththelengt

8、hofinterimat90minButthereisseriousintemaldenitrificationwhenthelengthofinterimexceeds120min7ItisinfeasibletoaddprecipitantintoUNITANKreactorsdirectlyKeywordsUNITANK，municipalwastewaterphosphateremoval，cycleoperationchemi