水生植物对二级处理水中氮,磷的净化

PURIFICATION OF NITROGEN AND PHOSPHORUS IN SECONDARY TREATMENT EFFLUENT BY AQUATIC PLANTS

本试验采用水生植物作为对二级处理水中氮、磷去除的方法,在静水中经过3d凤眼莲净化,全N的去除率为79—95％,P为58.9％;经红萍净化,全N的去除率为38.5—66.6％,P为0;水体自然净化(主要是自生的藻类),全N的去除率为9.4—55.1％,P为34％。在流动的水中经过5d风眼莲净化,全N去除率为90％以上,P为97.3％,pH为7.2(原为7.5),浊度为1.0(原为9.0以上).研究表明,水生植物有明显改善水质的功能.此法具有成本低,耗能少、操作管理简便等优点.

In the effluent of secondary treatment N and P were removed by aquatic plants.The removal efficiency of total N and P in a static system for 3 days was 79-95% and 58.9% by Eichhornia crassipes, 38.5-66.6% and 9.4-55.1% and 34% by natural purification (mainly algae). After purifying flow sewage for 5 days by Eichhornia crassipes, the removal efficiency of total N was more than 90%,P 97.3%. The pH was reduced from 7.5 to 7.2, turbidity was reduced from more than 9 to 1.0. Aquatic plant has significant effect for improve water quality.