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Study on Multi-Effect Membrane Distillation

Authors： QIN Yingjie*, LIU Liqiang, HE Fei, Zhang Yanping, WU Yin， WANG Shichang

Units： Tianjin University

KeyWords： Multi-effect membrane distillation; water gained output ratio; seawater desalination; concentrated brine; concentration; multi-effect

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2012, 32(2):59-64

Abstract：

An experimental investigation was carried out on concentrating aqueous solution containing 0.1– 20% sodium chloride by using multi-effect membrane distillation (MEMD) device. Influences of various experimental conditions on water permeate flux, water gained-output-ratio (GOR) and rejection of salt were studied. The experimental result showed that the water permeation flux increased with increase of the feed inlet flow rate, and increased with increase of the heated feed temperature; the water GOR also increased with increase of the heated feed temperature, however, it slightly decreased with increase of the feed inlet flow rate; both the water permeate flux and water GOR decreased with increase of the concentration of sodium chloride in the feed solution; the rejection of salt was hardly affected by these factors. The water permeate flux could reach 6.8L/(m2.h) and the water GOR could reach 12.5 when the concentration of sodium chloride in the feed solution was low; when the salt concentration was higher than 15%, the water permeate flux was still more than 5.2L/(m2.h) and the water GOR was more than 6.2, the rejection of salt could reach 99.99%. Thus multi-effect membrane distillation process could efficiently deal with concentrated aqueous solution.

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AuthorIntro：

秦英杰 (1964- )，男, 河北乐亭人，博士，天津大学化工学院，教授，博导，从事膜分离和废水处理研究；电邮：yqin@chembrane.com，电话：022 27890430， 13920403901

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