Abstract—Bromide (Br−) can form disinfection by-products (DBPs) in drinking water sterilization (chlorination or ozonation) processes, and these DBPs have adverse effects on human health. In this study, we tried to remove Br− from desalinated water, which was produced from seawater by spray flash desalination, using hydrotalcite (HT), before sterilization, for use as drinking water. Although HT did not remove Br− from desalinated water by ion exchange, calcined HT removed Br− by reconstruction. Br− removal by reconstruction of calcined HT became saturated at sample/solution = 2 g/L after reaction for 2 h, and increased with increasing temperature. The adsorption kinetics was examined based on pseudo-first-order and pseudo-second-order reaction models, and the adsorption rate constants for these kinetics models were calculated. Adsorption experiments demonstrated that the adsorption process fitted a pseudo-second-order kinetics model better than a pseudo-first-order model.
Index Terms—Br− removal, hydrotalcite, ion exchange, reconstruction.
Takaaki Wajima is with the Department of Urban Environment Systems, Graduate School of Engineering, Chiba University, Japan (e-mail: wajima@ tu.chiba-u.ac.jp).
[PDF]
Cite:Takaaki Wajima, "Removal of Bromide from Desalinated Water Using Hydrotalcite," International Journal of Environmental Science and Development vol. 5, no. 2, pp. 202-206, 2014.
