净水厂滤池反冲洗水回收处理的工程实践

THE ENGINEERING PRACTICE OF THE RECOVERY TREATMENT OF THE FILTER BACK FLUSHING WATER IN THE WATER PURIFICATION PLANT

根据杭州市某净水厂现有净水工艺流程,分析了滤池反冲洗水的水质、水量及存在的问题。通过对反冲洗水的现场沉降试验,提出了滤池反冲洗水回收处理方案,即反冲洗水在回收水池中自然沉淀后,上层清液由回收水泵送至净水厂的进水再利用,下层沉淀的底流用排污泵送至污泥池与沉淀污泥一并浓缩脱水处理。工程实践表明,反冲洗水的回用处理方案技术可行,可以有效提高原水利用率,值得推广应用。

According to the existing water purification process of a water plant in Hangzhou,the water quality, water quantity and existing problems of filter back flushing water were analyzed. By the field sedimentation test of the back flushing water, the recovery treatment scheme of filter back flushing water was proposed, the back flushing water supernatant, which was sent to the water purification plant after natural precipitation in the recycling pool, was reused by the reclaimed water pump, while the precipitation underflow, which was sent to sludge tank with settling sludge, was thickened and dewatered by sewage pump. The engineering practice shows that the recovery treatment scheme of the back flushing water is feasible technically and can improve the utilization rate of raw water effectively. The scheme is worth popularizing and applying.