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:025322468(2000)20520660203:X703.5:A,,,(,510640):COD,,,,,.:;;;.StudyonthecooperationofflocculationinthebiochemicaltreatmentofpulpCEHbleachingeffluentsCHENYuancai,XIAOJin,ZHANHuaiyu,WANGJie(StateKeyLaboratoryofPulp&PaperEngineering,SouthChinaUniversityofTechnology,Guangzhou510640)Abstract:TheCooperationofflocculationinthebiochemicaltreatmentofpulpCEHbleachingeffluentswasinvestigatedthroughthechangeofhighandlowweightmolecularcompositiontoxicityandCODofeffluentsintheflocculationprocess,theresultshowedthatinthechemicalprocessthehighweightmolecularcompositionandtoxicitycanbeeffectivelyremoved,whichenhancedthefol2lowingbiologicalprocess.Keywords:flocculation;biochemistryprocess;cooperation;pulpCEHbleachingeffluents:1999209203;:2000202221:(97023):(1967),,(),,1990-1991AOX()2.5kg/t(),19931.5kg/t(),BritishColumbioaOntarioAOX.1986TOCl115-2kg/t(),20000.5kg/t(),20050.1kg/t(),(GB3544-92)AOX1.5kg/t().,,,.,:CODBOD,AOX,,Milosevich[1],,.Sullivan[2],30%AOX.,,..1CEH,1.20520009ACTASCIENTIAECIRCUMSTANTIAEVol.20,No.5Sep.,20001Table1EffluentcharacteristicspHCODCr,mg/LBOD5,mg/LSS,mg/LAOX,mg/L,mg/L,4.11260372310572821125pHpHS23C;;CODCr;Schoniger[3]AOX;:0.45m,752CPPA;PelliconCasstte,0.45m,1KD,1.8MPa;[4],,530nm24h;[5].,,:I70=t/t0:tt070%.5.22.1COD0.45m,1KD,COD,,12.1CODFig.1CODreductioninprocess2Fig.2Toxicityreductioninprocess121KD,,.,,.COD610mg/L532mg/L,12%,63%21%,COD1KD,.COD1260mg/L540mg/L,22%,1KD.,37%,63%21%,.2.2,3,,9.1,11665:3Fig.3Methaneproductioninanaerobicbio2logicalassayKDAmicon4.3,,.,1KD,Parker[6].,2.2,.,,.,,,,.,,,,,.,.,,,,.,,,.,.,.31KD,;,..:[1]MilosevichGM,etal.ReductionofAOXinbleachplanteffluentbyadditionofmillprocessalkslis[J].PulpPaperofCana2da,1991,93:6167[2]SullivanJ,etal.EffectofchemicaltreatmentsofbleacheryeffluentsonAOXreduction[J].PulpPaperofCanada,1994,12:165171[3]BengtE,etal.Determinationofinorganicchlorinecompoundsandtotalchlorineinspentbleachingliquors.SvenskPaper2Sidning,1976,17:570[4],.QSAR.,1995,16(5):1821[5],,..2000,21(2):9497[6]ParkerW,etal.Assessmentofdesignandoperatingparametersforhighrateanaerobicdechlorinationofsegregatedkraftmillbleachplanteffluents.WatEnvirRes,1993,65(3):36637026620