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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p H值至7.0;在絮凝池前,向原水中投加70 g/m3的粉末聚硫酸铁;滤后加氢氧化钠回调出水p H值,以满足《生活饮用水卫生标准》(GB 5749—2006)的p H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<0.3 mg/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。
According to the conventional treatment process design of a water plant pilot plant, the raw water contaminated by cerium as the test water sample, to investigate the effect of enhanced coagulation to remove helium in water. The results show that the enhanced coagulation can achieve a better effect of removing maggots. The best removal method is: adding hydrochloric acid to adjust the p H value of raw water to 7.0; before the flocculation tank, add 70 g/m3 of powdered polysulfuric acid to the raw water. Iron; After filtration, sodium hydroxide is used to recall the p H value of the water, so as to satisfy the p H value requirement (6.5 to 8.5) of the Hygienic Standard for Drinking Water (GB 5749-2006). The average removal rate of lanthanum in this scheme was (77.55±5.12)%, the effluent helium was <5 μg/L, and the total iron was <0.3 mg/L, all meeting the water quality standard. The enhanced coagulation method is simple, economical and safe, and it is a practical drinking water removal technology.