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31Vol.3,No.120091ChineseJournalofEnvironmentalEngineeringJan.2009112345(1.,130021;2.,130062;3.,130022;4.,214214;51,133000)(VSS/SS0.42),(NaOHCaO),pHORP()SCODTPNH32N,30120min,ORP;SCOD,NaOHCaO;NaOHTP,CaO;,NH32N;,X705A167329108(2009)0120179204CharacteristicsofwasteactivatedsludgewithlowVSScontentbyultrasonicandalkalinepretreatmentYinJun1ZangLixin1YuHaixia2LiLiping3CuiYuzhuo4LiuChunfeng5(1.JilinKeyLaboratoryofWaterPollutionControlandResourcesReuse,JilinArchitecturalandCivilEngineeringInstitute,Changchun130021;2.ChangchunHaiweiCivilWorksDesignCo.Ltd.,Changchun130062;3.AuditOfficeofJilinProvince,Changchun130022;4.JiangsuMingchengEnvriotechLtd.,Yixing214214;51YanbianDaenArchitecturalEngineeringReconnaissanceandDesignCo.Ltd.,Yanji133000)AbstractThepretreatmentprocessofwasteactivatedsludge(WAS)withloworganiccontent(VSS/SS=0.42)fromwastewatertreatmentplant(WWTP)wascarriedoutusingultrasonictreatmentandthecombinationofultrasonicandalkalinetreatment,andthechangesofpH,ORP,SCOD,TP,NH32Ninliquidphasevs.ultra2sonicationtimeweredetermined.TheresultsshowedthattheORPdecreasedgreatlywithintherangeof30minto120minbythecombinationofultrasonicandalkalinetreatment.ThereleaseofSCODwasincreasedbythecombinationtreatmentofultrasonicandalkaline,andtheSCODconcentrationreleasedfromthesamplebyaddingNaOHwashigherthanthatbyaddingCaO.ThepretreatmentofNaOHcombinedultrasonicsenhancedthereleaseofTP,andthereexistedaslightreleaseofTPfromthesamplewiththeadditionofCaO.TheNH32Ncon2centrationreleasedintotheliquidphasewaslower.Accordingtothescanningelectronmicroscope(SEM)photo2graph,theflocstructureoftreatedsludgewasimprovedandbecametight.Keywordswasteactivatedsludge;ultrasonic;alkaline;treatment:(2004040521):2008-05-09;:2008-06-30:(1954),,,,E2mail:hitjunyin@163.com,540t,,201020015[1],,1993,,,,,,,,,,[2],(120W,20kHz)4h,78%TCODJean[3]0.33W/mL,340min,99%,SCOD60min12,,,pHORPSCODTPNH32N,1111,/,:pH6.58,ORP-102mV,TCOD15313mg/L,TP()1.3mg/L,NH32N()5.31mg/L,SS38204mg/L,VSS16053mg/L,VSS/SS42%,VSS/SS,42%,,1121,50W,40kHz,1000mL,,1Fig11Schematicdiagramofultrasonictreatmentsetup11331L,31000mL,,1400mgNaOH,560mgCaO,,pH98.56.6;,114COD5B21COD;SCOD15min,COD;pHORPpH/Oxi340i;TP,NH32N[4]2211pHORP0.05W/mL,pHORP,232,,30minpH,,SCOD3090minpH,,,,NaOHCaO,pH,0811:SCOD,,pH3,30120min,ORP,NaOHORP-256.3mV,212SCODSCODSCOD:DDCOD=(SCOD-SCOD0)/(TCOD-SCOD0)(1):DDCODSCOD(%);SCODCOD(mg/L);TCODCOD(mg/L);SCOD0COD(mg/L)0.05W/mL,SCODSCOD454SCODFig14ChangeofSCODinsupernatantliquidwithtreatmenttime4,,SCOD,NaOHSCOD,1h,SCOD1178.42mg/L2h,CaOSCOD3,NaOHSCOD7.2,,,SCOD,60min,SCOD,,5SCODFig15ChangeofreleasedSCODinsupernatantliquidwithtreatmenttime5,,SCOD,SCOD,VSS/SS,,SCOD,,,,,Onyche[5],,23%,213TPNH32N,,SCOD,TPNH32N0.05W/mL,TPNH32N,676TPFig16ChangeofTPinsupernatantliquidwithtreatmenttime6,NaOHTP,240min,TP30.7751mg/L,NaOH,18137NH32NFig17ChangeofNH32Ninsupernatantliquidwithtreatmenttime,CaOTP,CaOCa,[Ca5(OH)(PO4)3],TP7,3NH32N,,,,NH32N214,,88Fig18Changeoftheflocstructureofsludgebeforeandafterpretreatment83,,,,,,3(1),pH,;ORP,(2)SCODSCOD,NaOHSCOD,CaO;2h,SCOD7.23(3)NaOH,TP,CaO,CaOCa,[Ca5(OH)(PO4)3],TP(4),NH32N,NH32N,(5),,,[1],,..,2007,33(2):2022[2]ChiuY.C.,ChangC.N.,LinJ.G.,etal.Alkalineandultrasonicpretreatmentofsludgebeforeanaerobicdiges2tion.Wat.Sci.Tech.,1997,36(11):155162[3]JeanD.S.ReductionofmicrobialdensitylevelinsewagesludgethroughpHadjustmentetandultrasonictreatment.WaterSci.Technol.,2000,42(9):97102[4].(4).:,2002.279281[5]OnycheT.I.,SchlaferO.,BoomannH.Ultrasoniccelldisruptionofstabilizaedsludgewithsubsequentanaerobicdigestion.Ultrasonic,2002,40:3135281