氧化-铁盐混凝法处理低质量浓度含砷矿井水的试验研究

试验研究了不同氧化工艺与铁盐混凝工艺联合处理矿井水中砷的效果。原水p H值为7.67,砷质量浓度为1 mg/L,采用铁盐混凝法处理时,Fe与As的质量比为6∶1、反应时间为30 min,砷的去除率为62%;当其与空气氧化法联合处理时,Fe与As的质量比为6∶1、反应时间为30 min、曝气量为0.05 m~3/h,砷的去除率为69%;当其与过氧化氢氧化法联合处理时,Fe与As的质量比为6∶1、反应时间为5 min、过氧化氢用量为0.01 m L/L,砷的去除率为99%。试验结果表明:引入氧化体系有助于含砷矿井水的处理,提高了砷的去除率;采用Fenton氧化体系与铁盐混凝法联合处理工艺,降低了铁盐药剂用量,提高了砷的去除率,缩短了反应时间。

Experimental research on treatment of low mass concentration arsenic-containing underground mine water by oxidation-iron salts coagulation

The paper carried out experimental research on the effect of different combined oxidation and iron salts coagulation processes treating arsenic contained in underground mine water .If the pH of primary water is 7.67,and the mass concentration of arsenic in it is 1 mg/L,the arsenic removal rate will be 62%when the mass ratio of Fe and As is 6:1 and the reaction time is 30 min;if the iron salts coagulation is combined with aeration oxidation in the treat-ment,the arsenic removal rate will be 69%when the mass ratio of Fe and As is 6:1,the reaction time is 30 min and the aeration rate is 0.05 m3/h;if the iron salts coagulation is combined with hydrogen peroxide in the treatment ,the arsenic removal rate will be 99 %when the mass ratio of Fe and As is 6:1,the reaction time is 5 min and the dosage of hydrogen peroxide is 0.01 mL/L.The results show that the introduction of oxidation system contributes to the treat-ment of arsenic-containing underground mine water .The combined treatment process of Fenton oxidation system and i-ron salts coagulation lowers iron salts consumption ,improves arsenic removal rate and shortens reaction time .