It also provided experience for sewage reclaim and alteration and sewage purification.
为污水回收改造和浆厂污水处理设计提供经验。
The clay mineral to the sewage purification is the present sewage treatment research hot spot.
粘土矿物对污水的净化是目前污水处理的研究热点。
Utilising algae for sewage purification is a biotechnology of transforming sewage into re - sources.
利用藻类净化污水是一项污水资源化生物技术。
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