江西新余仙女湖镉铊砷突发环境事件应急供水

Emergent Water Supply in Environmental Accident of Cadmium,Thallium and Arsenic in Xiannvhu Lake in Xinyu City

2016年4月,由于企业偷排废水,酿成了江西新余仙女湖突发环境事件,新余市部分水厂停水。该事件主要污染物为镉、铊、砷,属重金属复合污染,应急净水的难度大。课题组在原有分别针对这几种污染物的应急净水技术的基础上,通过现场试验,确定了应对镉、铊、砷复合污染的水厂应急净水工艺,并在新余市的第三水厂和河下镇水厂实施了应急净水,及时恢复了城市供水。在应急净水的氧化处理技术上有新的突破,为了满足除铊效果,需要投加过量的高锰酸钾,为此在沉后水投加焦亚硫酸钠,用来还原剩余的高锰酸钾,并投加助滤剂强化滤池过滤效果,从而大幅度提升了工艺的可操控性和处理效果的稳定性。所确定的应对镉、铊、砷复合污染的应急净水工艺,易于改造和运行,净水效果稳定,适用于不同类型的水厂,在应对多种重金属复合污染的应急净水技术上有重要发展。

In April, 2016, an environmental accident happened due to illegal discharge of indus- trial wastewater in Xiannvhu Lake, Xinyu City, Jiangxi Province, China. The pollutants included cadmi- um, thallium and arsenic. Based on technologies dealing with those heavy metals separately, some tests were conducted. An emergent water treatment process was developed for combined pollution of cadmium, thallium and arsenic, and was put into operation in the waterworks in Xinyu City. The municipal water supply was resumed soon. A progress on oxidation technics had been made. An over-dosage of potassium permanganate was needed for thallium removal, therefore, sodium pyrosulfite was added in settler effluent to reduce the exceeded potassium permanganate. Some filtration aid had also been used to enhance the filtration. The process for combined heavy metals pollution had good feasibility and stability, and was suitable for different kinds of waterworks.