纳滤工艺用于锰矿区受污染水体处理的研究

Treatment of Polluted Water in Manganese Mining Area by Nanofiltration Process

常规水处理工艺难以有效处理锰矿区受污染水体,该研究针对某锰矿区受污染水体特点,采用中心组合设计方法(CCD)对纳滤技术应用于模拟高含锰受污染水的处理过程进行优化,获得的最佳运行条件为操作压力1.6 MPa,p H值5.0和温度19.6℃,并验证了该响应的可靠性,得到膜通量为73.3 L/(m^(2)·h),除盐率为91.9%,除锰率为94.0%。回收率实验表明,采用该纳滤工艺的产水回收率可达60%。研究表明,单独增大Mn^(2+)、Ca^(2+)或Mg^(2+)离子的初始浓度均会导致其自身与溶液中存在的其他离子截留率的下降;而SO_(4)^(2-)离子的初始浓度增大则会提高其自身及溶液中存在的其他离子的截留率;溶液中存在的低浓度重金属离子(如Ni^(2+))的浓度改变对溶液中存在的高浓度的Mn^(2+)、Ca^(2+)、Mg^(2+)和SO_(4)^(2-)的离子截留率几乎没有影响。研究结果表明该工艺可有效地处理锰含量高、硬度高、硫酸盐浓度高的锰矿区受污染水体,研究结果可为纳滤技术处理矿区受污染水体的实际应用提供参考。

Conventional water treatment processes cannot effectively deal with contaminated water in manganese mining area.In this study,the central composite design(CCD)was applied to optimize the process of nanofiltration technology for the treatment of a simulated source water with high manganese concentration.The optimal conditions were obtained as operating pressure of 1.6 MPa,pH of 5.0 and temperature of 19.6℃.The reliability of the response was verified by experimental results with membrane flux of 73.3 L/(m^(2)·h),salt removal efficiency of 91.9%and manganese removal efficiency of 94.0%.The recovery ratio of produced water by this nanofiltration process can reach up to 60%.The increase of the initial concentration of Mn^(2+),Ca^(2+)or Mg^(2+)reduces the retention efficiencies of itself and other coexisting ions in solution,while the increase of the initial concentration of SO_(4)^(2-)increases the retention efficiencies of itself and other coexisting ions in solution.The variation of heavy metal ion(such as Ni^(2+))with low concentration has little impact on the retention efficiencies of coexisting Mn^(2+),Ca^(2+),Mg^(2+)and SO_(4)^(2-)ions with high concentration in solution.These results show that the nanofiltration technology can effectively treat the polluted water with high manganese concentration,high hardness and high sulfate concentration in manganese mining area,and the results obtained in this study would promote the practical application of nanofiltration technology in the treatment of polluted water in mining areas.