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三氯化铁混凝作用提高膜生物反应器混合液可滤性 被引量:6

Improvement of Filterability of Mixed Liquor in Membrane Bioreactor by Coagulation of Ferric Chloride
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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.
出处 《天津大学学报》 EI CAS CSCD 北大核心 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)
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 membrane bioreactor(MBR) soluble microbial products (SMP) molecular weight (MW) extracellular polymeric substances(EPS) modified fouling index(MFI)
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