de-contamination of water

• 污水处理

de-contamination of water的用法和样例：

例句

1. Ponds of sewage treatment,escape canals.
   污水处理池，排水沟渠，游泳池。
2. The solid parts of the waste water are processed and composted and finally turned into top soil, fertilizing the island.
   固体部分的污水处理和分解，最后变成最土壤，施肥的岛屿。