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Impacts of coagulant on a chemical enhanced MBR applied for advanced treatment of Dyeing wastewater

Authors： ZHANG Yingmin，WU Peilin，SUN Na，XIAO Xiaolan，WANG Xinhua*, LI Xiufen

Units： School of Environmental and Civil Engineering，Jiangnan University，Wuxi 214122

KeyWords：：membrane bioreactor (MBR)；dyeing wastewater；FeCl3；CaCl2；membrane fouling

ClassificationCode：X703

year,volume(issue):pagination： 2013,33(4):82-87

Abstract：

Impacts of coagulant on the effluent water quality and membrane fouling of a chemical enhanced membrane bioreactor (CEMBR) applied for advanced treatment of dyeing wastewater were investigated. In this study, three adding modes of 30 mg/L FeCl3, the combination of 30 mg/L FeCl3 and 30 mg/L CaCl2 and 30 mg/L CaCl2 were applied, and synthetic secondary effluent of dyeing wastewater composed of disperse red was used as influent of the CEMBR. The results showed that adding FeCl3 and the combination of FeCl3 and CaCl2 could enhance the removal of color, chemical oxygen demand (COD), ammonia nitrogen and total phosphorus, and alleviate the membrane fouling of CEMBR. Compared with the addition of FeCl3, adding the combination of FeCl3 and CaCl2 had better effect on reducing membrane fouling. It could be attributed to the facts that FeCl3 could reduce the extracellular polymeric substances (EPS) and increase the particle size in sludge by flocculation, and CaCl2 could enhance the flocculation of FeCl3. However, only adding CaCl2 deteriorated membrane fouling due to the increase of EPS and reduction of particle size in sludge. Furthermore, both FeCl3 and CaCl2 could increase the ratios of matters with bigger molecular weight (MW) in dissolved organic matters (DOM), and the impact of CaCl2 on MW distribution was more remarkable than that of FeCl3.

Funds：

污染控制与资源化研究国家重点实验室开放课题（PCRRF11021）；江苏省自然科学基金项目（BK2011159）

AuthorIntro：

张迎敏（1990-），女，内蒙古人，本科，学生，主要从事膜-生物反应器研究，E-mail: 1084109781@qq.com．*通讯联系人

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