三氯化铁混凝作用提高膜生物反应器混合液可滤性  

Improvement of Filterability of Mixed Liquor in Membrane Bioreactor by Coagulation of Ferric Chloride

作　　者：张海丰[1] 孙宝盛[1] 赵新华[1] 齐庚申[1] 许艳红[2] 

机构地区：[1]天津大学环境科学与工程学院,天津300072 [2]北华大学林学院,吉林132013

出　　处：《天津大学学报》2008年第2期131-136,共6页Journal of Tianjin University(Science and Technology)

基　　金：天津市应用基础研究计划项目(07JCZDJC02100);天津市科技创新专项资金资助项目(06FZZDSH00900)

摘　　要：探讨了投加三氯化铁对膜生物反应器(MBR)膜污染减缓的影响,比较了复合式膜生物反应器(HMBR)和传统膜生物反应器(CMBR)污泥混合液的可滤性.结果表明:当Fe(Ⅲ)的投加量为1.2 mmol/L时,能最大程度地提高污泥混合液的可滤性;稳定阶段的HMBR膜污染速率大约是CMBR的40%;Fe(Ⅲ)强化去除了上清液中分子质量(MW)>10 kDa的溶解性微生物产物(SMP);上清液中大分子有机物的去除有助于提高污泥混合液的可滤性.污泥絮体中胞外聚合物(EPS)的元素分析表明,Fe(Ⅲ)与EPS中的负电官能团相互结合,增大了污泥颗粒.The effect of ferric chloride addition into the membrane bioreactor （MBR） on retarding membrane fouling was investigated. The filterability of mixed liquor in a hybrid membrane bioreactor （HMBR） and a conventional membrane bioreactor （CMBR） was compared. The results show that Fe （Ⅲ） addition greatly improves filterability of mixed liquor when the dosage of Fe （Ⅲ ） equals 1.2 mmol/L. During the steady-state peried, the fouling rate of HMBR is 40 % slower than that of CMBR. Fe （ Ⅲ ） enhances the removal of soluble microbial products （SMP） with molecular weight （MW） 〉 10 kDa molecules in the supematant. The decrease of macromolecule in the supematant has a positive effect on improving filterability of mixed liquor. Element analysis of extracellular polymeric substances （EPS） of activated sludge indicates that Fe （ Ⅲ ） interacted with the negatively charged groups in EPS, which resulted in enlarged sludge floes.

关 键 词：膜生物反应器 溶解性微生物产物 分子质量 胞外聚合物 修正的污染指数 

分 类 号：X703.3[环境科学与工程—环境工程]