利用溶气气浮工艺强化处理低浊高色富含有机物地表水

低浊高色富含有机物地表水难于混凝,试验采用“混凝-溶气气浮”(“混凝-DAF”)工艺处理此类水,并与常规“混凝-沉淀”工艺进行了比较。结果表明,“混凝-DAF”工艺在较低投药量时能取得更好的处理效果;对于“混凝-DAF”工艺,增大混凝剂投量后出水浊度基本不变,但出水色度及CODMn可进一步降低;“混凝-DAF”工艺去除水中有机物的能力优于“混凝-沉淀”工艺。最后,对“混凝-DAF”工艺去除水中有机污染物的机理进行了探讨。

DAF enhanced treating surface water with low turbidity,high color and abounding organic matter

It is difficult to treat surface water with low turbidity, high color and abounding organic matter by coagulation, and coagulation and dissolved air flotation (DAF) process is used to treat this raw water. The results show that as compared with coagulation and sedimentation process, coagulation and DAF process is more efficient in treating raw water in this case at lower coagulant doses, and there is no clear benefit in the removal of raw water turbidity with increasing coagulant doses in coagulation and DAF process, but there are benefits in the removal of raw water color and organic matter. Coagulation and DAF process is more efficient in the removal of organic matter in raw water of low turbidity and high color than coagulation and sedimentation process. Finally, the mechanisms on removal of organic matter by using coagulation and DAF process are analyzed.