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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。
In order to study the effect of different precipitants on the acid mine wastewater treatment effect in the neutralization-sedimentation-coagulation process, taking the wastewater from the tailing pond of Dabaoshan mine in Guangdong Province as an example, three common precipitants (sodium sulfide, Sodium carbonate and DTCR) constitute three kinds of combined precipitation process (L-SS-F, L-SC-F and LDTCR-F) were compared. The results showed that the dosage of sodium sulfide and sodium carbonate reached 100, 200 mg / L respectively in L-SS-F and L-SC-F process, and the removal rates of other heavy metals in wastewater except for Mn were as high as 94% -100% ; In the L-DTCR-F process, DTCR dosage reached 40mg / L, the removal rate of all heavy metals in wastewater was above 94%. The cost of the three kinds of combined precipitation processes was L-SS-F: L-SC-F: L-DTCR-F = 1: 1.3: 1.5. It is recommended that sodium sulfide be used as precipitant for acidic mine wastewater with ρ (Mn) <25 mg / L; DTCR precipitation may be used for acid mine wastewater with higher Mn content.