东太湖原水2-MIB污染应急处理技术

Technological Process of Emergency Treatment for 2-MIB Pollution in Raw Water of East Taihu Lake

某水厂以东太湖为水源,夏季致嗅物质二甲基异崁醇(2-MIB)风险频发。研究取水口及附近水域2-MIB的变化规律并探讨了2-MIB的来源;同时,结合水厂实际案例,分析2-MIB在不同应急处理工艺下的去除效果。结果表明:东太湖原水中2-MIB与蓝藻和底泥的释放有关;应急投加粉末活性炭对夏季原水中2-MIB具有较好的去除效果;当原水遭受复合污染时(即CODMn、藻类和嗅味浓度水平均较高),粉末活性炭两步投加方式较单点投加对原水中2-MIB的去除效果有明显的促进作用(去除率提高12.8%)。

A water treatment plant intakes East Taihu Lake water as the raw water,and the occurrence of odoriferous 2-MIB in raw water is frequent in summer.2-MIB concentration variation in water intake and adjacent water was illustrated and the source of 2-MIB was explored in the paper.In addition,removal effects of 2-MIB under different emergency treatment processes was analyzed.Results showed that 2-MIB in the raw water of East Taihu Lake was related to cyanobacteria and sediment release.Powdered activated carbon(PAC)for emergency use had a good removal effect on 2-MIB in raw water in summer.Two-step addit-on of PAC could significantly improve the removal efficiency of 2-MIB in raw water comparing with single-step addition(increasing by 12.8%)when raw water experienced compound pollution.