ZHANG Shan?shan,JI Hai?hong,WU Qiao?ling,et al.Zero Discharge Treatment Technology and Engineering Application of Coal Mine Water[J].China Water & Wastewater,2022,38(2):98-103.
煤矿矿井水处理零排放技术与工程应用
- Title:
- Zero Discharge Treatment Technology and Engineering Application of Coal Mine Water
- Keywords:
- coal mine water; zero discharge; pretreatment; concentration reduction; evaporative crystallization
- 摘要:
- 以陕西某煤矿矿井水零排放工程为例，对该工程的预处理、浓缩减量和蒸发结晶的工艺进行研究，并对系统的运行效果、成本及效益进行了分析。结果显示，对于处理水量为1 900 m3/h、总溶解固体（TDS）约3 200 mg/L的矿井水，预处理阶段采用混凝澄清过滤工艺，浓缩减量阶段采用反渗透+碟管式反渗透（DTRO），蒸发结晶阶段采用蒸汽机械再压缩（MVR）能够实现矿井水处理零排放，产水TDS约418 mg/L，满足设计及回用要求。蒸发结晶阶段产生的硫酸钠盐约4.9 t/h，其纯度为99.12%，可作为化工原料使用。
- Abstract:
- Taking the zero discharge project of a coal mine in Shaanxi Province as an example, the process of pretreatment, concentration reduction and evaporative crystallization is studied, and the operation effect, cost and benefit of the system were analyzed. The results showed that when the amount of coal mine water was 1 900 m3/h and the concentration of TDS was 3 200 mg/L, the mine drainage had achieved zero discharge for a combined process including coagulation, clarification and filtration in pretreatment stage, reverse osmosis and disc tube reverse osmosis(DTRO) in concentration reduction stage, and finally mechanical vapor recompression (MVR) in evaporative crystallization stage to treat the effluent TDS to about 418 mg/L，which could satisfy the design and reuse requirements. The sodium sulfate salt produced in evaporative crystallization stage was about 4.9 t/h with purity of 99.12%, which could be used as chemical raw materials.
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