西藏萨迦县卡乌地热水的水环境效应

Water environmental effects of Kawu geothermal water in Sajia County,Tibet

对西藏萨迦县卡乌村高温地热水进行实地调查,发现该地区地热水中超标(GB 3838—2002《地表水环境质量标准》Ⅱ类与WHO《饮用水水质标准》(第二版))的有害元素主要有F、B、As、Sb、Tl、Be,放射性有毒元素主要为Th、U。借助折线图、内梅罗指数法,分析冲曲河在流经该地热区前后各超标有害元素的质量浓度变化情况。结果表明,地热水严重影响了冲曲河的水质。最后,对卡乌村高温地热水的利用提出了相关建议。

An investigation to high temperature geothermal water in Kawu Village of Sakya County, Tibet was made. We found that harmful elements in geothermal water whose concentrations were far higher than the limits of class 11 of ＂environmental quality standard of surface＂ （GB3838--2002） and the safety limits of ＂Drinking Water Quality Standards＂ （ the second edition） were F,B,As,Sb,T1,Be, while radioactive toxic elements are mainly Th, U. We analyzed the concentration variation of harmful elements before and after Chongqu River flows through the geothermal area with line charts and the Nemerow index method. The results show that geothermal water seriously affects the water quality of Chongqu River. In the end, some useful suggestions about the utilization of geothermal water were put forward.