摘要
以模拟遭受突发性镉污染的水体为研究对象,在水厂常规工艺的基础上,考察了化学沉淀技术对镉污染原水的应急处理效果。结果表明,当分别采用三氯化铁和聚合氯化铝为混凝剂时,分别将滤后水pH值控制在8.69和8.58以上,可有效去除超标50倍的镉污染物,且对镉的去除率随着pH值的提高而增大;在最大应急能力方面,将滤后水pH值分别控制在9.17和8.73以上,可分别有效去除超标500和80倍的镉污染物,使镉浓度降至国标限值以下。在混凝前pH值变化不大的情况下,投加聚合氯化铝的滤后水pH值的降低幅度要大于投加三氯化铁的。
Taking the source water polluted suddenly by cadmium as research object, the chemical precipitation used in emergency treatment was investigated based on conventional technologies. The result indicates that using ferric chloride and PAC as coagulant and adjusting pH of filtered water above 8.69 and 8.58 respectively can effectively remove cadmium pollutant whose concentration is 50 times higher than the national standard limit. The removal rate of cadmium is improved with increasing the pH. In aspect of maximum removal capability, the cadmium concentrations being 500 and 80 times higher than the national standard limit can be effectively decreased by means of controlling the pH of filtered water above 9.17 and 8.73 respectively. The pH decreasing range of filtered water with PAC is larger than that with ferric chloride when the pH hardly changes before coagulation.
出处
《中国给水排水》
CAS
CSCD
北大核心
2011年第17期62-64,67,共4页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2008ZX07420-005)
关键词
饮用水
镉污染
应急处理
化学沉淀
drinking water
cadmium pollution
emergency treatment
chemical precipitation
