Sludge reduction becomes an increasingly urgent issue because sludge problem is becoming more and more outstanding in sewage treatment plants.
污水处理厂日益突出的剩余污泥问题，使实现污泥减量化变得更加迫切。
Sludge reduction becomes an increasingly urgent issue because sludge problem is becoming more and more outstanding in sewage treatment plants.
污水处理厂日益突出的剩余污泥问题，使实现污泥减量化变得更加迫切。
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