两种药剂用于受污染开放性水体除磷 效果对比研究

采用改性硅藻土和PAC混凝剂处理不同水质的受污染开放性水体，以达到除磷的目的。对比了两种药剂对不同水体的除磷效果，分析了两种药剂的除磷机理。结果表明：不同受污染水质的水体，最佳除磷药剂也不同。对总磷中以颗粒态磷为主要成分的开放性水体，选用改性硅藻土不仅除磷效率高，且絮体沉降性能较好，最终产生的污泥量较少，出水更加清澈透明。对总磷中以正磷为主要成分的开放性水体，选用PAC等常规金属盐类混凝剂除磷效果更佳。对总磷中正磷和颗粒态磷都有一定含量的开放性水体，将两种药剂混合使用比单一使用一种药剂效果更好，两种药剂的最佳混合比例，需根据具体水质情况以实验确定。

Comparative study on effects of two agnts for phosphorus removal from polluted open water

The modified diatomite and PAC coagulant are adopted to treat the polluted open water for phosphorus removal. The phosphorus removal effects of both the agents are compared and then the phosphorus removal mechanisms of them are analyzed as well. The result shows that the best phosphorus removal agents are different for the polluted waters with various water qualities. For the open water with the total phosphorus mainly consisting of the particulate phosphorus，the phosphorus removal efficiency is not only higher by the selection of the modified diatomite，but the performance of the flocculation settlement is also better with less sludge yield and more clear outlet-water. Meanwhile，the phosphorus removal effects are much better，if the metal-polysilicate coagulants such a PAC etc. are selected for the phosphorus removal of the open water with the total phosphorus mainly consisting of the positive phosphorus. So far as the open water containing both the positive phosphorus and particle phosphorus with certain contents is concerned，the effect of the utilization with the mixture of both the agents is better than that from only one agent，however，the best mixing ratio of both the agents is necessary to be determined with the relevant test in accordance with the specific water quality.