德兴铜矿精尾厂废水纳滤法浓缩和分离

Concentration and separation of wastewater nanofiltration from tailings of Dexing Copper Mine

为了改善德兴铜矿精尾厂采用HDS工艺处理后的酸性废水和综合废水中COD和部分金属离子含量超标的水质情况,对酸性废水和综合废水在温度30℃、进料压力1.5 MPa、流量16-18 L/min条件下进行了纳滤处理.研究表明：随着纳滤浓缩倍数的增大,膜通量均呈现下降趋势,酸性废水浓缩4倍后的膜通量由70.06 L/（m^2·h）减小到21.86 L/（m^2·h）,综合废水浓缩5倍后的膜通量由103.14 L/（m^2·h）减小到39.99 L/（m^2·h）;纳滤处理后,酸性废水和综合废水中的SS、COD、S2-、Zn、Pb均达到现有企业排放标准;实验结束后,采用常规方法对纳滤膜进行清洗后,纳滤膜通量基本恢复到原来的膜通量.

In order to improve the water conditions of acidic wastewater and complex wastewater after HDS process in tailings factory of Dexing Copper Mine and deal with the content of COD and some metal ions that exceed the emission standard, the treatments on those wastewater by nanofiltration are tested under the conditions of temperature of 30 ℃, feed pressure of 1.5 MPa and membrane flux of 16 -18 L/min. It is found that membrane flux shows a trend of decline with the increase of nano-filtration concentration times. After four nano-filtration concentration times, the membrane flux of acidic wastewater is reduced from 70.06 L/（m^2·h） to21.86 L/（m^2·h）. After five nano-filtration concentration times, the membrane flux of complex wastewater is reduced from 103.14 L/（m^2·h） to 39.99 L/（m^2·h）. SS,COD,Cu,S2-,Zn,Pb contained in both of acidic wastewater and complex wastewater have reached the existing enterprise emissions standards. After the experiment, the flux of nano-filtration membrane has basically restored to the original membrane flux by cleaning the membrane in the conventional methods.