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In this study, aromatic polyamide reverse osmosis membranes were used to
remove zinc ions from electroplating wastewater. Influence of different operating
conditions such as time, zinc concentration and pressure on reverse osmosis process
efficiency was studied. The experimental results showed, concentration of zinc in
permeate increase with increases of time from 0 to 70 min, and flux of water through
membrane decline with time. While, the concentrations of zinc in permeate increase
with the increase in feed zinc concentration (10–300 mg/l), flux decrease with the
increment of feed concentration. The raise of pressure from 1 to 4 bar, the zinc
concentration decreases and the flux increase. The highest recovery percentage was
found is 54.
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