For cleanness of waters in our country, it is essential to treat domestic sewage with purification tank under dispersed state, besides sewage treatment plant under centralized state.
为了确保我国水体清洁，生活污水除了集中处理之外，分散式的净化槽系统也是不可缺少的。
At the time, the reefs should have regenerated as a sewage plant began to treat Eilat's waste.
那时，珊瑚礁本来应该可以再生，因为当时一个污水处理厂开始处理埃拉特的垃圾了。
How to treat sludge from sewage treatment plant is a big difficult problem faced by big or middling cities.
如何处置污水处理厂产出的污泥是世界各大、中城市面临的一大难题。
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