湘江株洲段镉污染对长沙市水源水镉浓度的影响及其应急处理措施的探讨

Impacts of Cadmium Pollution of Zhuzhou Section of Xiangjiang River on Cadmium Concentration of Source Water of Changsha and Discussion on Its Emergency Processing Measures

目的应急监测镉污染事件后长沙市各自来水厂水源水和出厂水水镉浓度,并采取应急处理措施,以确保市民饮用水健康。方法按照GB/T5750-1985《生活饮用水标准检验方法金属标准》(无火焰原子吸收分光光度法)检测水镉。结果在监测时段内,各水厂水源水水镉浓度均超过国家标准,呈现先升后降的变化趋势;在各自来水厂反应池入口处投加石灰乳,并增投絮凝剂后出厂水水镉浓度降至国家标准以下。结论湘江株洲段镉污染对长沙市各水厂水镉浓度显著影响,水源水水镉浓度均明显上升且超过国家标准;采取投加石灰乳,并增投絮凝剂的应急措施效果明显。

Objective To monitor the concentration of cadmium from source water and finished water of waterworks in Changsha after the incident of cadmium pollution,and to adopt the emergency processing measures for ensuring the citizens＇ drinking water safety. Methods According to the Sanitary Standard for Drinking Water Quality （GB/T5750-1985）,flameless atomic absorption spectrometry was used to detect the concentration of cadmium. Results The concentrations of cadmium from source water of waterworks in surveillance period were all above the national standard and showed the tendency of increase first and decrease later.After putting lime cream in the entrance of source water of waterworks and increasingly putting water-treatment flocculants,the concentration of cadmium from finished water of waterworks had slipped below the national standards. Conclusions Cadmium pollution of Zhuzhou Section of Xiangjiang River has significant effect on cadmium concentration of source water of waterworks in Changsha,and cadmium concentration of source water is significantly increased and moreover is above the national standard.The results indicate that emergency processing measures,including putting lime cream and increasingly putting water-treatment flocculants,are very effective.