二次混凝+沉淀工艺处理高岩粉矿井水试验研究

Experimental study on treatment of high rock powder mine water by secondary coagulation and precipitation process

针对河北某矿矿井水岩粉含量较高(原水浊度为340 NTU)、预沉后水质发白等问题,采用二次混凝+沉淀工艺进行处理,研究了混凝剂、助凝剂、投加方式与投加量对处理效果的影响。结果表明:最佳混凝剂为PAC,最佳助凝剂为阴离子型PAM;最佳投加方式为一次混凝投加100 mg/L PAC、二次混凝投加20 mg/L PAC与0.6 mg/L PAM,这一加药条件下的沉淀出水浊度为4.6 NTU,浊度去除率达到98.7%,PAC投加量较一次混凝沉淀减少29.4%;采用二次混凝+沉淀工艺能减少药剂投加量并提高悬浮物去除效率。

Facing at the problems of high rock powder in a mine's water in Hebei(The original water turbidity is 340 NTU)and water turning white after pre-sinking,the treatment was carried out by secondary coagulation and precipitation process.The effects of coagulant,flocculant,dosing method and dosage on the treatment effect were studied.The results showed that the best coagulant was PAC and the flocculant was anionic PAM.The best dosing method and dosage were 100 mg/L PAC for the first coagulation and 20 mg/L PAC+0.6 mg/L PAM for the second coagulation.By using such dosing method,the turbidity of precipitated water was 4.6 NTU,the turbidity removal rate was 98.7%,and the dosage of PAC decreased by 29.4%compared with the primary coagulation precipitation.Thus the secondary coagulation and precipitation process can reduce the dosage of the drug and improve the treatment efficiency.