A Study on the Effect of pH on the Transport of NaCI through RO membrane

摘要

The effects of electrical characteristics on the membrane performance were studied. pH control agents, NaOH and HCl, had been added to various concentrated sodium chloride feed solution. Using these solution as feed materials, RO batch test had beed conducted. From these experiment, permeate flux was increased by 1 ～ 8 times to pH 7 at pH 5 and 9 for pure water. The degree of permeate pH change was large in high and low pH range, and rejection and permeate flux at pH 5 or 9 were always greater than that of pH 7.