There are many reports on the removal of heavy metal by NF and RO membrane. Cséfalvay et al. (2009) used NF and RO to recover copper from process wastes. Liu et al. (2008b) studied the performance of different NF and RO membranes in treating the toxic metal effluent from metallurgical industry. They reported that the product water by both NF and RO desalination satisfied the State Reutilization Qualification, but NF would be more suitable for large-scale industrial practice. Koseoglu and Kitis (2009) investigated the recovery of silver from mining wastewaters using NF or RO after the silver is taken into solution as AgCN employing re-cyanidation and subsequent sedimentation and/or pre-filtration of wastewaters. Silver recoveries achieved by hybrid cyanidation and membrane separation were 29-59% and 54-62% for NF and RO membranes, respectively.