Research Progress of Chloride Removal Technology in Water Treatment

Abstract

Salinization caused by the high concentration of Cl − in water has become one of the most serious and common environmental problems. This review aims to provide comprehensive and up-to-date knowledge and insights on chloride removal technologies. At present, the main methods of chlorine removal are chemical precipitation, adsorption, membrane separation and advanced oxidation processes (AOPs). In chemical precipitation, Cl − is removed by forming CuCl, AgCl, and Bi-OCl precipitates. The main adsorbents used for chlorine removal are ion exchangers, bimetallic oxides and carbon-based electrodes. AOPs include ozone-based AOPs, electrochemical-based AOPs,