The wastewater consist of the sludge flushed out from the sedimentation tanks and the wash water disposed from the filter beds.

• 这些污水主要来自沉淀池或澄清池的排泥水和滤池的反冲洗排水，这些污水如果不经处理直接排入水体，不但污染水体，而且浪费了大量的水资源。