强化混凝去除水中锑的中试运行效果分析

Analysis of Operation Effect of Pilot Plant with Enhanced Coagulation for Removing Antinomy

根据某水厂常规处理工艺设计中试装置，以受锑污染原水为试验水样，考察强化混凝去除水中锑的效果。结果表明，强化混凝可以取得较好的除锑效果，其最佳去除方案为：投加盐酸调节原水pH值至7．0；在絮凝池前，向原水中投加70g／m^3的粉末聚硫酸铁；滤后加氢氧化钠回调出水pH值，以满足《生活饮用水卫生标准》（GB5749-2006）的pH值要求（6．5～8．5）。该方案对锑的平均去除率为（77．55±5．12）％，出水锑〈5μg／L、总铁〈0．3mg／L，均满足水质标准。强化混凝方法简单、经济且安全，是切实可行的饮用水源水除锑技术。

A pilot plant was designed according to the conventional treatment processes in a water treatment plant to investigate the removal efficiency of antimony from polluted raw water by enhanced coagulation. The results indicated that the enhanced coagulation could achieve good effect in removing anti- mony from water. The best scheme for removing antimony was as follows ： adjusting pH value of raw water to 7.0 by adding HC1, adding polyferric sulfate （PFS） of 70 g/m3 to raw water before flocculator, and re-adjusting pH value by adding NaOH after filtration so as to meet the Standards for Drinking Water Quality （ GB 5749 - 2006）. By means of this method the average removal rate of antimony could reach as high as （77.55 ±5.12）%, and the concentrations of antimony and total iron in treated water were less than 5 μg/L and 0.3 mg/L respectively, both meeting the standard mentioned above. It was also proved that enhanced coagulation can be considered as a practicable technology for removing antimony from drinking water sources due to its simple, economic and safe properties.