低温低浊水中聚硫氯化铝应急处置Cr(Ⅵ)的实验

Experiments on emergency treatment of Cr(Ⅵ) in low temperature and low turbidity water by polyaluminum chloride sulfate(PACS)

近年来,我国频发水环境突发污染事件,给生产生活造成巨大影响。在低温低浊条件下探究了不同混凝剂对Cr(Ⅵ)的去除效果,并以聚硫氯化铝(PACS)为混凝剂,考察pH、PACS投加量、PAM投加量、静置时间、Cr(Ⅵ)初始质量浓度对Cr(Ⅵ)去除效果的影响。结果显示,PACS的去除效果优于其他混凝剂,在pH为8、PACS投加量为200 mg/L、PAM投加量为6 mg/L、静置时间为30 min条件下,Cr(Ⅵ)去除率可达91.7%,PACS的混凝效果随Cr(Ⅵ)质量浓度的增大而下降。投加PACS可实现对Cr(Ⅵ)的快速混凝沉淀。

In recent years,the frequent occurrence of sudden water environmental pollution accidents in China has been causing bad social effects on people’s production and life.Under low temperature and low turbidity conditions,the removing effect of different coagulants on Cr(Ⅵ)has been probed into.Using polyaluminium chloride sulfate(PACS)as the coagulant,the influences of pH,PACS dosage,PAM dosage,standing time and initial mass concentration of Cr(Ⅵ)on the Cr(Ⅵ)removing effect are investigated.The results show that the coagulation effect of PACS is better than that of other coagulants.Under the following conditions:pH=8,PACS dosage is 200 mg/L,PAM dosage 6 mg/L,and standing time 30 min,the removing rate can reach 91.7%,and the coagulation effect decreases with the increase of Cr(Ⅵ)concentration.The rapid coagulation precipitation of Cr(Ⅵ)in the wastewater can be achieved by the addition of PACS.