污泥淤砂分离器再分离底流污泥
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摘要
研究了污泥淤砂分离器对分离原污泥所得的底流污泥进行再分离时,分离分流污泥的性质。实验结果表明,原污泥MLVSS/MLSS为0.372,1次分离后得到的底流污泥MLVSS/MLSS为0.222,2次分离后得到的底流污泥MLVSS/MLSS为0.126,表明通过底流污泥再分离,能够进一步降低底流污泥中生物有机质的含量,提高底流污泥中无机淤砂的含量。同时,原污泥CST为2.85(s·L)/g SS,1次分离后得到的底流污泥CST为0.98(s·L)/g SS,2次分离后得到的底流污泥CST为0.12(s·L)/g SS,表明底流污泥再分离进一步提高了底流污泥的脱水性能,最终得到的底流污泥脱水性能良好。
We studied the properties of separated sludge when the underflow sludge separated from raw sludge was reseparated using sludge-grit separator. The results show that the MLVSS /MLSS of raw sludge is 0.372. When the raw sludge is separated,the MLVSS /MLSS of underflow sludge is 0. 222. When the underflow sludge separated from raw sludge is reseparated,the MLVSS /MLSS of the final underflow sludge is 0. 126. It is indicated that when the underflow sludge separated from raw sludge is resaparated,the content of biomass in the final underflow sludge is reduced and the content of inorganic matter increases. The results also show that the CST of raw sludge,underflow sludge separated from raw sludge and the final underflow sludge obtained from the reseparation of underflow sludge are 2. 85( s·L) /g SS,0. 98( s·L) /g SS and 0. 12( s·L) /g SS,respectively. It is demonstrated that the reseparation of underflow sludge improves the dewaterability of final underflow sludge.The dewaterability of the final underflow is quite good.
We studied the properties of separated sludge when the underflow sludge separated from raw sludge was reseparated using sludge-grit separator. The results show that the MLVSS /MLSS of raw sludge is 0.372. When the raw sludge is separated,the MLVSS /MLSS of underflow sludge is 0. 222. When the underflow sludge separated from raw sludge is reseparated,the MLVSS /MLSS of the final underflow sludge is 0. 126. It is indicated that when the underflow sludge separated from raw sludge is resaparated,the content of biomass in the final underflow sludge is reduced and the content of inorganic matter increases. The results also show that the CST of raw sludge,underflow sludge separated from raw sludge and the final underflow sludge obtained from the reseparation of underflow sludge are 2. 85( s·L) /g SS,0. 98( s·L) /g SS and 0. 12( s·L) /g SS,respectively. It is demonstrated that the reseparation of underflow sludge improves the dewaterability of final underflow sludge.The dewaterability of the final underflow is quite good.
引文
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[15]吉芳英,晏鹏,范剑平,等.污泥淤砂分离器的分离效能及影响因素.同济大学学报(自然科学版),2013,41(3):42-46Ji F.Y.,Yan P.,Fan J.P.,et al.Separation performance and factors of grit separation module.Journal of Tongji University(Natural Science),2013,41(3):42-46
[16]裴海燕,胡文容,李晶,等.活性污泥与消化污泥的脱水特性及粒径分布.环境科学,2007,28(10):2336-2242Pei H.Y.,Hu W.R.,Li J.,et al.Dewaterability and particle size distribution of activated and digestion sludge.Environmental Science,2007,28(10):2336-2242
[17]方静雨,马增益,严建华,等.污泥脱水性能指标的比较分析.能源工程,2007,(4):51-53Fang J.Y.,Ma Y.Z.,Yan J.H.,et al.CoMParative investigation of parameters for determining the dewaterability of activated sludge.Energy Engineering,2007,(4):51-53
[2]吉芳英,晏鹏.山地城市排水管网特细颗粒物特性及变化规律.环境科学研究,2012,25(3):322-327Ji F.Y.,Yan P.Characteristics and variation of superfine particles in a drainage pipe network of a mountainous city.Research of Environmental Sciences,2012,25(3):322-327(in Chinese)
[3]邵林广.城市污水处理中初沉池的设置.给水排水,2001,27(9):5-7
[4]许劲,孙俊贻,周幸儒,等.不设初沉池时沉砂池的选型分析.重庆建筑大学学报,2005,27(5):61-64Xu J.,Sun J.Y.,Zhou X.R.,et al.Type selection of grit clarifier without primary sedimentation tank.Journal of Chongqing Jianzhu University,2005,27(5):61-64(in Chinese)
[5]Mansour-Geoffrion M.,Dold P.L.,Lamarre D.,et al.Characterizing hydrocyclone performance for grit removal from wastewater.Minerals Engineering,2010,23(4):359-364
[6]庞学诗.水力旋流器技术与应用.北京:中国石化出版社,2010
[7]Wang B.,Yu A.B.Numerical study of particle-fluid flow in hydrocyclones with different body dimensions.Minerals Engineering,2006,19(10):1022-1033
[8]Wang B.,Yu A.B.Numerical study of gas-liquid-solid flow in hydrocyclones with different configuration of vortex find-er.Chemical Engineering Journal,2008,135(1-2):33-42
[9]Chu K.W.,Wang B.,Yu A.B.,et al.CFD-DEM study of the effect of particle density distribution on the multiphase flow and performance of dense medium cyclone.Minerals Engineering,2009,22(11):893-909
[10]Wang B.,Chu K.W.,Yu A.B.,et al.Numerical studies of the effects of medium properties in dense medium cyclone operations.Minerals Engineering,2009,22(11):931-943
[11]Saengchana K.,Nopharatanab A.,Songkasriric W.Enhancement of tapioca starch separation with a hydrocyclone:Effects of apex diameter,feed concentration,and pressure drop on tapioca starch separation with a hydrocyclone.Chemical Engineering and Processing:Process Intensification,2009,48(1):195-202
[12]Azadi M.,Azadi M.,Mohebbi A.A CFD study of the effect of cyclone size on its performance parameters.Journal of Hazardous Materials,2010,182(1):835-841
[13]Lim E.W.C.,Chen Y.R.,Wang C.H.,et al.Experimental and computational studies of multiphase hydrodynamics in a hydrocyclone separator system.Chemical Engineering Science,2010,65(24):6415-6424
[14]吉芳英,胡学斌,宗述安,等.一种适用于去除污水处理厂活性污泥中淤沙的分离器:中国,CN201110159013.X.2012-01-04
[15]吉芳英,晏鹏,范剑平,等.污泥淤砂分离器的分离效能及影响因素.同济大学学报(自然科学版),2013,41(3):42-46Ji F.Y.,Yan P.,Fan J.P.,et al.Separation performance and factors of grit separation module.Journal of Tongji University(Natural Science),2013,41(3):42-46
[16]裴海燕,胡文容,李晶,等.活性污泥与消化污泥的脱水特性及粒径分布.环境科学,2007,28(10):2336-2242Pei H.Y.,Hu W.R.,Li J.,et al.Dewaterability and particle size distribution of activated and digestion sludge.Environmental Science,2007,28(10):2336-2242
[17]方静雨,马增益,严建华,等.污泥脱水性能指标的比较分析.能源工程,2007,(4):51-53Fang J.Y.,Ma Y.Z.,Yan J.H.,et al.CoMParative investigation of parameters for determining the dewaterability of activated sludge.Energy Engineering,2007,(4):51-53