Nanjing Tech University and others have applied for patents related to the effective removal of organic components from chemical saline wastewater, as well as the recovery and reuse of the main salt components in such wastewater

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Nanjing Tech University and others have filed a patent for a device and method for the resource utilization of the main salts in chemical and saline wastewater; this approach enables the effective removal of organic components from such wastewater while allowing the recovery of the main salt components contained within it. According to information from the Intellectual Property Office, as of July 9, 2025, Nanjing Tech University and Nanjing Sankuang Chemical Equipment Supervision Co., Ltd. have applied for a patent titled “Device and Method for the Resource Utilization of the Main Salts in Chemical and Saline Wastewater,” with the publication number CN120271168A and an application date of April 2025. The patent abstract indicates that this invention discloses a device and method for the resource utilization of the main salts in chemical salt-based wastewater. It includes components such as an input port for such wastewater, a supercritical reactor, a supercritical cyclone separator, an inorganic filtration structure, a salt crystallization tank, an ion exchange membrane, an input port for oxidants, a plunger pump, and a heater. By taking advantage of the superior ability of supercritical water to remove organic components, as well as the fact that inorganic salts are practically insoluble in supercritical water, this invention enables the oxidation of chemical salt-based wastewater using supercritical water. This process allows for the removal of the organic components present in the wastewater in a single step, while simultaneously precipitating and separating the main salts; some of the salts with lower concentrations remain dissolved in the supercritical water and are carried away with it. The effluent supercritical water is depressurized through desorption and then purified using inorganic membranes; the resulting pure water is used to dissolve the separated main salt and proceed to the ion exchange membrane process, thereby yielding the product. The present invention can effectively remove organic components from chemical saltation wastewater and recycle the main salt components in it; it features a simple process and low costs, enabling the harmless treatment and resource utilization of such wastewater.