反渗透-电去离子复合处理水中Ni2+研究

摘要

The combined reverse osmosis and electrodeionization (RO-EDI) process was used for treating nickel in water under different operational conditions. Experimental results showed that this combined process had high efficiency in purifying the nickel-containing wastewater. It could reduce the Ni2+ concentration from initial 200 mg ? L-1 to lower than 0. 5 mg ? L-1. The optimum operational conditions are: a pressure of 1. 5 Mpa for Ros a Ni2+ concentration of 1600 mg ? L-1 in the RO concentrate; and a current density of 7. 5 A ? Cm"2 and a hydraulic retention time of 4 min for EDI.%考察了不同条件下反渗透-电去离子(RO-EDI)复合处理水中Ni2+的效果.实验结果表明,此复合技术具有良好的净化效率,可将Ni2+质量浓度由原先的200 mg· L-1降至0.5mg· L-1以下.合适的操作条件为RO压力1.5 MPa；RO浓缩回收液Ni2+质量浓度1600 mg·L-1；EDI电流密度7.5 A·cm-2 ;EDI水力停留时间4 min.