污泥龄对HMBR中S-EPS及膜污染的影响
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摘要
采用4台复合式膜生物反应器(HMBR)处理生活污水,研究了污泥龄(SRT)对溶解性胞外聚合物(SEPS)及膜污染的影响。结果表明,SRT对S-EPS有重要影响,当SRT由10 d延长到20 d时,S-EPS降低了6.8%;继续延长SRT到30 d和60 d,S-EPS基本保持稳定。S-EPS对活性污泥物理性能影响较大,它与Zeta电位、污泥絮凝沉淀性能及滤饼层比阻具有较强的相关性。当SRT为20 d时,随着S-EPS的减少,膜过滤阻力明显降低,膜总阻力仅为1.9×1013m-1,膜组件过滤周期为99 d。
Four hybrid membrane bioreactors(HMBR) have been used for treating domestic sewage,and the influences of sludge retention time(SRT) on soluble extracellular polymeric substances(S-EPS) and membrane fouling investigated. The results show that SRT has important influences on S-EPS. When the SRT is extended from 10 d to20 d,S-EPS is decreased by 6.8%. When the SRT is continuously extended to 30 d and 60 d,S-EPS remain stable basically. S-EPS have a relatively strong influence on the physical performances of activated sludge,which has relatively strong correlation with Zeta potential,activated sludge flocculation and sedimentation performances,and the cake layer specific resistance. When the SRT is 20 d,the membrane filtration resistance is decreased obviously with the decrease of S-EPS,the total membrane resistance is only 1.9×1013m-1,and the membrane filtering cycle of membrane modules is 99 d.
Four hybrid membrane bioreactors(HMBR) have been used for treating domestic sewage,and the influences of sludge retention time(SRT) on soluble extracellular polymeric substances(S-EPS) and membrane fouling investigated. The results show that SRT has important influences on S-EPS. When the SRT is extended from 10 d to20 d,S-EPS is decreased by 6.8%. When the SRT is continuously extended to 30 d and 60 d,S-EPS remain stable basically. S-EPS have a relatively strong influence on the physical performances of activated sludge,which has relatively strong correlation with Zeta potential,activated sludge flocculation and sedimentation performances,and the cake layer specific resistance. When the SRT is 20 d,the membrane filtration resistance is decreased obviously with the decrease of S-EPS,the total membrane resistance is only 1.9×1013m-1,and the membrane filtering cycle of membrane modules is 99 d.
引文
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[14]刘子森,肖恩荣,张丽萍,等. EPS及其测定方法分析[J].膜科学与技术,2015,35(4):103-109.
[15]王红武,李晓岩,赵庆祥.活性污泥的表面特性与其沉降脱水性能的关系[J].清华大学学报:自然科学版,2004,44(6):766-769.
[16]刘强,王晓昌.附着性胞外多聚物对HMBR膜污染控制性能的影响[J].环境工程学报,2012,6(12):4395-4399.
[2] Shim J K,Yoo I K,Lee Y M. Design and operation considerations for wastewater treatment using a flat submerged membrane bioreactor[J].Process Biochem.,2002,38(3):279-285.
[3] Muhammad H,Malack A. Determination of biokinetic coefficients of an immersed membrane bioreactor[J]. J. Membr. Sci.,2006,271(1/2):47-58.
[4] Hsieh K M,Murgel G A,Lion L W,et al. Interactions of microbial biofilms with toxic trace metals:1. observations and modeling of cell growth,attachment and production of extracellular polymer[J]. Biotechnol. Bioeng.,1994,44(2):219-231.
[5] Nielsen P H,Jahn A,Palmgren R. Conceptual model for production and composition of exopolymers in biofilms[J]. Water Sci. Technol.,1997,36(1):11-19.
[6] Liu Qiang,Wang Xiaochang,Liu Yongjun,et al. Performance of a hybrid membrane bioreactor in municipal wastewater treatment[J].Desalination,2010,258(1/2/3):143-147.
[7]国家环境保护总局.水和废水监测方法[M]. 4版.北京:中国环境科学出版社,2002:105-106.
[8]刘强,付莎,杜于蛟.淹没式复合型MBR处理城市生活污水的效能研究[J].中国给水排水,2007,23(5):10-13.
[9]张自杰,林荣忱,金儒霖.排水工程(下册)[M]. 4版.北京:中国建筑工业出版社,2000:386-387.
[10] Wang Xiaochang,Liu Qiang,Liu Yongjun. Membrane fouling control of hybrid membrane bioreactor:Effect of extracellular polymeric substances[J]. Seperation Science and Technology,2010,45(7):928-934.
[11] Gaudy A F. Colorimetric determination of protein and carbohydrate[J]. Ind. Water Wastes, 1962,7(1):17-22.
[12] Frфlund B,Griebe T,Nielsen P H. Enzymatic activity in the activated-sludge floc matrix[J]. Appl. Microbiol. Biot.,1995,43(4):755-761.
[13]曹占平,张宏伟,张景丽.污泥龄对膜生物反应器污泥特性及膜污染的影响[J].中国环境科学,2009,29(4):386-390.
[14]刘子森,肖恩荣,张丽萍,等. EPS及其测定方法分析[J].膜科学与技术,2015,35(4):103-109.
[15]王红武,李晓岩,赵庆祥.活性污泥的表面特性与其沉降脱水性能的关系[J].清华大学学报:自然科学版,2004,44(6):766-769.
[16]刘强,王晓昌.附着性胞外多聚物对HMBR膜污染控制性能的影响[J].环境工程学报,2012,6(12):4395-4399.