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Research on membrane fouling control by process of pre-oxidation enhanced coagulation-membrane to remove algae

Authors： CHEN Yuzhi

Units： School of environmental and chemical engineering, Tianjin Polytechnic University, Tianjin 300387

KeyWords： potassium permanganate; pre-oxidation; coagulation; membrane fouling control

ClassificationCode：X52；R123.6

year,volume(issue):pagination： 2016,36(1):104-108

Abstract：

The algal water peroxidation was conducted with potassium permanganate, with microcystis aeruginosa as the standard algae. Following the peroxidation, the raw water went through coagulation with Poly Aluminum Chloride（PAC）, after which was filtered with ultrafiltration membrane. The membrane fouling control was observed of which the mechanism was also researched. The concentration of potassium permanganate for pre-oxidation was 0, 0.5, 1.0, 1.5 and 2.0 mg/L respectively, after which the raw water was coagulated with mg/L of PAC. The floc formed by coagulation after peroxidation was observed with transmission electron microscope, combining with particle size analysis using the Malvern mastersizer and membrane fouling fraction analysis at the end of filtration period. The mechanism of controlling of membrane fouling was illuminated through the fouling composition. With the gradually increase of potassium permanganate concentration, effluent quality got improved, where DOC and UV254 decreased markedly, the floc became more loose, and the gradual increasing of floc size from 135 μm to 251 μm. It could be seen that the removal by membrane, hydraulic irreversible resistance and strong adsorption resistance were three important factors for the evaluation of membrane fouling control. With the gradually increase of potassium permanganate concentration, effluent quality got improved, where DOC and UV254 decreased markedly and the floc became more loose, of which size gradually increased from 135 μm to 251 μm, and the hydraulic irreversible decreased from 0.68×1010 cm-1 to 0.35×1010 cm-1. When the pre-oxidation concentration of KMnO4 was 1.5 mg/l, the strong adsorption resistance decreased from 0.25×1010 m-1 to 0.10×1010 m-1 compared with direct membrane filter, which meant it decreased the irreversible resistance, leading to the increase of flux and extraction of membrane lifespan, meanwhile, the removal of DOC and UV254 increased by 14.6% and 19.5% respectively.

Funds：

国家自然科学基金项目（51478314、21206125、51308390、51308391），天津市自然科学基金(14JCQNJC09000)

AuthorIntro：

第一作者简介：陈禹志（1989-），男，河北唐山人，硕士研究生，研究方向为膜法水处理研究，邮箱：tianji1989_11@163.com。*通讯作者：陈禹志 tianjin1989_11@163.com

Reference：

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