【摘要】 为研究中和-沉淀-混凝工艺中不同沉淀剂对酸性矿山废水处理效果的影响,以广东省大宝山矿槽对坑尾矿库废水为例,采用3种常用的沉淀剂(硫化钠、碳酸钠及DTCR)构成3种组合沉淀工艺(分别为L-SS-F,L-SC-F与LDTCR-F)进行了对比研究。结果表明:在L-SS-F与L-SC-F工艺中,硫化钠与碳酸钠的投加量分别达到100,200 mg/L,废水中除Mn以外的其他重金属去除率高达94%~100%;在L-DTCR-F工艺中,DTCR投加量达到40mg/L,废水中所有重金属的去除率均在94%以上。3种组合沉淀工艺的药剂费之比为L-SS-F∶L-SC-F∶L-DTCR-F=1∶1.3∶1.5。建议对于ρ(Mn)<25 mg/L的酸性矿山废水,可采用硫化钠作为沉淀剂;对于更高Mn含量的酸性矿山废水,可采用DTCR沉淀技术。更多还原

【Abstract】 In order to investigate the effect of different precipitators on acid mine drainage treatment efficiency in a combination precipitation technology( neutralization-precipitation-flocculation) proposed in this study,three kinds of common precipitants of sodium sulfide,sodium carbonate and DTCR were applied to this technology to form three combinations named as L-SS-F,L-SC-F and L-DTCR-F respectively. A wastewater sample taken from the Caoduikeng tailings reservoir of the Guangdong Dabaoshan Mine was treated by the three combination precipitation technologyies for a comparison on their efficiency and economy. The result shows that heavy metals except Mn in the wastewater have a removal rate of up to 94% ~ 100% as the dosage of sodium sulfide in the L-SS-F and sodium carbonate in the L-SC-F was added to 100 mg / L and 200 mg / L respectively,and the removal rate of all heavy metal is over 94% when DTCR was increased to 40 mg / L in the L-DTCR-F.The agent cost ratio of the three combination precipitation technologies is L-SS-F∶ L-SC-F∶ L-DTCR-F = 1 ∶ 1. 3 ∶ 1. 5. Sodium sulfide can be used as precipitating agent for an acid mine drainage with Mn < 25 mg / L,and DTCR deposition technology is suggested for an acid mine drainage with a greater Mn content( > 25 mg / L).更多还原