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According to a report from Sinochem New Network on December 1, the first 100-kilowatt-class hydrogen production system for treating oil and gas-associated wastewater in China, developed jointly by PetroChina Shenzhen New Energy Research Institute Co., Ltd. and Changqing Oilfield, has been operating continuously and stably at the Sulige Gas Field in Changqing. The system features a unique design with both atmospheric-pressure and pressurized electrolyzers; the atmospheric-pressure electrolyzer handles high-concentration wastewater directly, simultaneously degrading pollutants and producing hydrogen ； The pressurized tank is used for the large-scale, high-purity production of hydrogen from the purified brine, successfully overcoming technical challenges such as the easy deactivation of key materials in high-salinity and highly polluted environments. During the demonstration period, the system processed a total of 24 tons of wastewater, including fracturing return fluids and gas field production water. The maximum hydrogen production rate reached 40 standard cubic meters per hour, with the purity of the hydrogen reaching 99.99%; moreover, the removal rate of chemical oxygen demand (COD) in the wastewater was as high as 99%. In oil and gas field areas rich in wind, solar, and green electricity resources, this system converts the associated wastewater on-site into raw materials for hydrogen production, thereby simultaneously enabling the utilization of renewable energy and the resourceful treatment of highly polluting wastewater. Calculations show that, with the cost of green electricity at 0.2 yuan per kilowatt-hour, the normalized hydrogen production cost of this system is approximately 25% lower compared to the traditional approach of treating wastewater first and then producing hydrogen separately.