The Ability of a Nanofiltration Membrane to Remove Hardness and Ions from Diluted Seawater

In this work, the ability of a commercial spiral-wound nanofiltration membrane to remove hardness and ions from diluted seawater was studied. Experiments were carried out in the pressure range of 4-10 bar. Analyses of the samples, and permeates at different pressures, were performed and the effects of the trans-membrane pressure on the permeate flux were investigated. The results show that this nanofiltration membrane is capable of retaining 96-98% of the total hardness, 79-89% of the electrical conductivity and 79-89% of the total dissolved solid (TDS). Our results are in good agreement with those reported by the manufacturing company.