高悬浮物矿井水电化学特性分析及污染物去除效果研究

Analysis of electrochemistry characteristics and pollutant removal effect in the high suspension mine water

为了解决宝日希勒露天矿矿井水中浊度偏高的问题,通过对其矿井出水进行电化学特性分析,测得其悬浮物颗粒粒径主要分布在0.6~0.8μm内,Zeta电位为-23^-25 m V,需选用带正电荷的混凝剂使其沉降。在此基础上优化了"聚合氯化铝(PAC)+聚丙烯酰胺(PAM)"联合处理工艺,研究结果表明:选用30 mg/L PAC+0.5 mg/L PAM联合投加混凝剂的方式,出水浊度最低,可以达到10.8 NTU,浊度去除率达到95.5%;单独投加混凝剂条件下,PAC及聚合氯化铝铁(PAFC)对于水中浊度去除效果优于聚合硫酸铁(PFS),但对于水体化学需氧量(CODcr)的去除效果不及PFS,且投加3种混凝剂皆不能有效地降低水体总硬度。

In order to solve the problem of high turbidity in the mine water of Baorixile open-pit mine,the electrochemical characteristics of the mine water were analyzed,the particle size of the suspended solid particles was mainly distributed between 0.6μm and 0.8μm,and the Zeta potential was between-23 mV and-25 mV,the positively charged coagulant should be selected for settlement.On this basis,the“PAC+PAM”combined treatment process was optimized.The results shows that when the combined addition method of coagulants of 30 mg/L PAC+0.5 mg/L PAM is adopted,the effluent turbidity is the lowest,reaching 10.8 NTU,the removal rate reaches 95.5%;under the condition of single addition,PAC and PAFC are better than PFS in removing turbidity in water,but the removal effect of COD cr in water is not as good as PFS,and the addition of three flocculants can not effectively reduce the total hardness of water.