Research Progress on High Salinity and High COD Industrial Wastewater Treatment Technology

In the production process of chemical products such as ethylene and epichlorohydrin, a large amount of industrial wastewater is generated, which has high salt content (over 3.5%), high COD value (over 10000mg·L-1), and characteristics such as biological inhibition and toxicity. At present, it is difficult for sewage treatment plants to effectively treat this type of wastewater. Therefore, the treatment of this type of industrial wastewater has become one of the main obstacles to the green development of the chemical industry. This article reviews the research progress on the generation and treatment technology of high salinity and high COD industrial wastewater, including physicochemical, biological, and physicochemical biological coupling methods. The next steps in the treatment of such industrial wastewater are proposed.