基于高锰酸钾复合盐的原水预氧化处理研究——以重庆市A水厂为例

Study on Pre-Oxidation Treatment of Raw Water Based on Potassium Permanganate Composite Salt:Taking A Water Plant in Chongqing as an Example

模拟水厂常规处理工艺,在絮凝前添加高锰酸钾复合盐进行原水预氧化处理,确定聚合氯化铝(PAC)与高锰酸钾复合盐的最佳投加量。实验结果显示,PAC投加量为30 mg/L时,浊度去除率达到72.28%,浊度去除效果最好;COD_(Mn)去除率不超过20%,COD_(Mn)去除效果不佳。加入高锰酸钾复合盐溶液后,COD_(Mn)去除效果得到明显提高。高锰酸钾复合盐投加量为0.4 mg/L时,COD_(Mn)去除率达到最高值52.96%;但浊度去除效果不佳,同时,浓度过高会影响水体色度。在现场试运行中,高锰酸钾复合盐与PAC的组合工艺效果较好,解决了出厂水耗氧量高的问题,且出厂水各项指标正常。

Through laboratory simulation of the conventional treatment process of water plant,the optimum dosage of poly-aluminium chloride(PAC)and potassium permanganate compound salt is determined under the condition of adding potassium permanganate composite salt for raw water pre oxidation treatment before flocculation.The experimental results show that PAC at 30 mg/L has the best turbidity removal effect of 72.28%,while the removal effect of potassium permanganate index(COD_(Mn))is not good,and the removal rate is not more than 20%.However,the removal effect of COD_(Mn)increases obviously after the addition of potassium permanganate complex salt solution.When the concentration is 0.4 mg/L,the removal efficiency can basically reach the maximum value(52.96%),but the removal effect of turbidity is not obvious.At the same time,too high concentration would affect the chromaticity of water.In the field trial operation,the combined process of potassium permanganate compound salt and PAC has a good effect,which solves the problem of high oxygen consumption of the factory water,and all indicators of the treated water are normal.