氧化塘对重金属污染的去除研究

Research of heavy metal removing technology with oxidation ponds

随着重金属污染的加剧,对化工原料重金属铬(Cr^(6+))高效、稳定的处理成了社会研究的重点。但是传统重金属处理方法,成本高,操作难度大。氧化塘处理废水具有投资省、操作简单、启动快的特点。适合大面积推广投入使用。在氧化塘运行稳定的条件下,通过连续监测进出水中重金属铬、氨氮(NH_4^+-N)、磷酸盐(PO_4^(3-))、硫酸盐(SO_4^(2-))、化学需氧量(COD)等的变化,发现藻、菌共生的生物膜系统能同时高效去除氨氮、总铬,降低水中化学需氧量,其中,生物絮凝作用是去除重金属的主要机理。

With the heavy metal pollution of chemical raw materials intensifies, heavy metal chrome(Cr6+) effective treatment became social research priorities. But traditional processing method brings heavy high cost and operation difficulty. Technology of oxidation ponds owns the characteristics of low investment, simple operation, fast start, and is suitable for using in remote areas and mountainous areas. With stable operation conditions of oxidation ponds, by continuous monitoring on heavy metal chromium ammonia nitrogen in water(NH4+-N) phosphate(PO43-) sulfate(SO42-)chemical oxygen demand(COD), it was found that the biofilm symbiotic system of algae bacteria can effectively remove the chrome and organic phosphate. The biological flocculation is the main mechanism of heavy metal removal.