comparison of the bromate ions removal by nanofiltration membranes under different operating conditions

bromate is toxic compound which represent the carcinogenic effect for human health, a serial research’s has been developed by the scientists for the efficient bromate removal methods from the water with low cost in order to obtain water to bromate a maximum concentration level (10ppb). bromate ions are formed as a result of the reaction between bromide ions and ozone used as a water disinfectant in membrane demineralization plants .different technologies have been used for bromate elimination from water such as ion exchange, adsorption, biofiltration, electrolysis and membrane technology.

the aim of this work is to study the rejection of bromate ions by nanofiltration membranes (n30f from nadir and dl from osmonics) made from different polymers using bromate solution at different conditions (feed bromate concentration, transmembrane pressure, ph and ionic strength).the bromate rejection is related to the feed solution, ph and ionic strength and the nature of the membrane. at ph=8, bromate ions were removed by the dl membrane made from polyamide around with higher than those by the n30f made from polyethersulfone .