secondary sewage treatment works 次级污水处理厂 ; 二级污水处理厂
secondary sewage treatment 二级污水处理 ; [环境] 二次污水处理
secondary sewage treatment plants 城市二级污水处理厂
Treating combined sewage effluent from a secondary treatment plant, the process achieved 94.5% cadmium removal for the trace quantities present .
用这种方法处理二级处理厂排出的综合下水，可除去水中含镉量的94.5。
Presently, active sludge method, or the establishment of secondary sewage treatment plants has been mainly adopted to treat urban sewage.
目前，对城市污水的处理主要采用活性污泥法即兴建城市二级污水处理厂。
A secondary sewage treatment system used in smaller communities.
一个二级污水处理系统，在较小的社区。
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