The secondary treating water from urban domestic sewage treatment plant was treated by fine membrane with the way of periodic counter-flow static type.
本研究对城市生活污水处理厂二次处理水，采用周期逆洗型静态过滤方式进行了精密膜过滤。
Water pollution caused by many factors: the body of water without proper treatment of urban domestic sewage and industrial waste water;
造成水体污染的因素是多方面的：向水体排放未经过妥善处理的城市生活污水和工业废水；
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