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侯巧玲关云峰尉国红罗国强(100022),,,ControlofSludgeFloatingintheSecondarySettlingTankHOUQiaolingGUANYunfengWEIGuohongLUOGuoqiang(BeijingUrbanConstructionEnviromentalProtectionInvestment&DevelopmentCo.,Ltd.Beijing100022)AbstractTheoxidationditchsludgetreatmentprocessisusedinDachengSewageTreatmentPlant.Thecausesoffloatingupwardofsludgeinsecondarysettlingtankisdiscussed.Themaincausesoffloatingupwardofsludgeisthehighdegreeofnitrificationandtoolongsludgere-tentioninthesecondarysettlingtank.Somemeasuresareadoptedtocontrolthesludgefloatingandmketheproductionnormal,suchasre-ducingthedissolvedoxygenintheoxidationditchtolowerthedegreeofnitrification,reasonablymodulatingtheoperationofthesecondarysettlingtankandincreasingsludgerefluxandremainedsludgerelease.KeyWordsoxidationditchfloatingupwardofsludgedenitrification0,,,[1]13,,(GB189182002)A1121.5104m3/d,10,10.8km2;4.0104m3/d,16.6,16.7km2,1,HRT1.5h,1,:17~20d,(BOD/MLSS)0.09kg/(kgd),MLSS3.5g/L,HRT12h,100%13,6(42),12(11)11mg/L(pH)BODCODSSTNNH3-NTPpH19037019045403.06~9105010155(8)0.56~922mg/L(pH)BODCODSSTNNH3-NTPpH8621014052453.26~92,,,33.1,,52IndustrialSafetyandEnvironmentalProtection20113711November2011200910,,,,,,SS,,,,,,3.2(1)SVI170mL/g,,,12,,,,[2],SVI120mL/g,,(2),,1m3/d22500m3/d,,222,97%,46.34mg/L,0.99mg/L,,6h,N2,,,,,,(3),,,,,,4(1),,,DO2mg/L,,,,,DO1.2mg/L,33DO3,DO,45.6mg/L,3.52mg/L,89%(2)0.8m3/(m2h),2.5h,,0.4m3/(m2h),(3),80%120%,,,,,,,[3],,5500mg/L3200mg/L,,5,,,,[1],,.AAC[J].,2006,26(4):78-79.[2],,,.A2/O[J].,2010,26(13):44-45.[3],,,.[J].,2000,18(6):25-27.侯巧玲,女,1978年生,四川阆中人,硕士研究生,助理工程师,研究方向为水污染控制(:2010-08-20)53