石灰和混凝沉淀相结合处理含SO42-和F-矿井水

采用石灰和混凝沉淀相结合的方法去除含SO42-和F-矿井水,并对去除机理及影响因素进行了研究。结果表明：石灰沉淀的最佳处理条件为石灰乳浓度5%,投加比20：1,沉淀平衡时间为6h;混凝沉淀的最佳条件为PAC溶液浓度25%,用量2 mL/100 mL,沉淀平衡时间为20 min,pH值6～8,温度20℃。处理后,SO42-脱除率大于91.0%,SO42-含量小于30 mg/L;F-脱除率大于78.5%,F-含量小于0.3 mg/L。

COMBINATION OF LIME AND COAGULATION REMOVING SO42-AND F- FROM MINE WATER

This article adopted Combination of lime and coagulation removing SO42-and F- from mine water.The mechanism and its influencing factors are studied.The results showed that,the optimum treatment conditions of Lime-sedimentation are such that the mass density of lime milk is 5%,the ratio of wastewater to lime milk is 20：1,the sedimentation time is 6h;the optimum treatment conditions of PAC coagulation sedimentation are such that the mass density of PAC is 25%,the dosing of PAC is 2mL/100mL,the sedimentation time is 20 min,pH 6 to 8,the temperature 20℃.By this method,the removal ratio of SO42-can reach over 91.0%,and the content of sulphate can lower to below 30mg/L;the removal ratio of F-can reach over 78.5%,and the content of fluorine can lower to below 0.3mg/L.