摘要
2012年11月贵州省铜仁市万山特区发生了锰矿尾渣库管涌泄漏事件，导致下游锦江河的河水受到锰污染，威胁沿岸居民饮用水安全。总结了自来水厂应对水源突发锰污染事件的应急处理技术与工艺，即高锰酸钾预氧化工艺。突发污染事故进入水体的锰主要以溶解态二价锰的形式存在，可在自来水厂中投加高锰酸钾氧化剂，经氧化形成二氧化锰难溶沉淀物，再在混凝一沉淀一过滤过程中随矾花去除。现场试验研究显示，高锰酸钾预氧化除锰工艺至少可应对50倍锰超标原水，应急处理后出水锰浓度可稳定在0．02mg／L左右，满足《生活饮用水卫生标准》（GB5749--2006）对锰的浓度限值要求（不大于0．1mg／L）。在试验原水水质条件下，高锰酸钾与原水中锰浓度的最佳投加质量比为1．5～1．7，略低于理论质量比（1．915），可能原因是反应生成的二氧化锰可吸附去除部分锰离子，减少了高锰酸钾消耗量。在运行中按此最佳投加比控制可以取得很好处理效果，并有利于避免高锰酸钾投加过量。
On the November, 2012, a pollution accident caused by pipe spill m a manganese mine repository took place in Wansban Special Region, Tongren City, Guizhou Province. The accidence caused the Jinjiang River manganese pollution and threatened the drinking water safety of downstream area residents. This paper summarized the emergency technology and process for the unexpected manganese pollution accidents in water treatment plant-potassium permanganate preoxidation. The potassium permanganate could oxidize manganese ions in water into manganese dioxide rapidly which could be removed by coagulation, sedimentation and filtration process. The insite test showed that for raw water with manganese concentration less than 50 times exceeded ＂Standards for Drinking Water Quality＂ （GB 5749-2006）（≤0. 1 mg/L）, potassium permanganate pre-oxidation process was successful and the manganese concentration in filter effluent was about 0.02 mg/L. This could meet the standards for drinking water quality. The optimized mass ratio between the potassium permanganate and the manganese in source water was 1.5 to 1.7, which was lower than the theoretical value of 1. 915, which was probably due to manganese dioxide partial adsorption. It would make good treatment effect in operation controled by this optimal closingratio, and to void potassium permanganate excessive adding.
出处
《给水排水》
CSCD
北大核心
2013年第12期27-31,共5页
Water & Wastewater Engineering
基金
国家水体污染控制与治理科技重大专项(2008ZX07420-005)
关键词
饮用水应急处理
锰
高锰酸钾预氧化
Emergency treatment of drinking water
Manganese
Potassium permanate pre-oxidation
