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Effect of hardness ions in seawater on organic fouling of reverse osmosis membrane

Authors： CHENG Jiangao, MA Jinghuan*, ZHAO Baojun, WU Shaobin, LIN Zhiwen, LIU Ying, TIAN Yu

Units： School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300160, China

KeyWords： hardness removal pretreatment; reverse osmosis; calcium ion; humic acid; organic fouling.

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2015,35(4):49-53

Abstract：

The effect of calcium and magnesium ions on organic fouling of reverse osmosis membrane is investigated by different pretreatment ways and preparing magnesium-free artificial seawater. The results show that flux decline of reverse osmosis membrane is effectively controlled by hardness removal pretreatment. Under one certain concentration of humic acid(HA), the conventional pretreatment may lead to a rapid decrease of membrane flux and salt rejection compared with hardness removal pretreatment because hardness ions in seawater accelerate organic fouling of reverse osmosis membrane. The reverse osmosis membrane flux and salt rejection decreased with increasing of calcium concentration in magnesium-free artificial seawater, and due to the complexation of calcium ion with humic acid, UV254 rejection increased with increasing of calcium concentration.

Funds：

天津市高校优秀青年教师资助计划

AuthorIntro：

程建高（1972-），男，内蒙古锡林浩特人，博士研究生，从事海水淡化和浓海水综合利用研究。

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