矿山酸性废水对乐安江水质影响

Influence of Acidic Mining Waste Water on Wa.ter Quality of Lean River.

矿山酸性废水对乐安江的污染是严重的,尤其在排污口附近江段,pH时有低于6.5的情况,重金属含量严重超标。模拟计算表明,在pH<6.5,Cu,Zn,Pb等元素主要以离子形态存在,分别为79.7％,76.8％,S8％,提高了它们对鱼类的毒性。在排污口附近,底泥中重金属很高,Cu>3000ppm,Pb>15ppm,Zn>100ppm;而在河口地区,Cu>500ppm,Pb>100ppm,Zn>600ppm,高度富集于底泥中。由于河流水质中碳酸盐含量低,其影响是严重的。此外,Al、Fe和Mn等元素,也对饮用水处理和鱼类生存造成负效应。

The lean river, especially in the region of waste water discharging point, was seriously polluted by mining waste water. The pH vallues of the river water were sometimes observed to be lower than 6.5 during flood season, the concentrations of heavy metals (Cu, Zn, Pb, Cd etc.) in the river water were close to or even obviously higher than the national standards of water quality. Furthermore, simulatitotn calculation in dicates that, at pH values lower than 6.5, most of the heavy metals existed in he water in the form of ions,resulting in even higer toxicity to fishes. The heavy metals were also found to be accumulated in the sediment of the river. Besides, thte elements like Al, Fe, Mn etc, also exerted negative influence on the treatment of drinking water and fishery.