This study investigates the degradation of oil recovery wastewater and the generation of Na₂FeO₃ in an anodic oxidation system. The electrochemical oxidation technique with a Ti/Ru–Ir oxide-coated anode and NaCl as electrolyte was used to treat oilfield wastewater, which reduced the TOC value in the wastewater from 210 mg L⁻¹ to 115.9 mg L⁻¹. Meanwhile, active chlorine was generated in the wastewater; subsequently, ferric sulfate and sodium hydroxide were added to the electrolyzed wastewater, and the formation of Fe(III) precipitates due to the coagulation effect further reduced the TOC value in the wastewater to 25.7 mg L⁻¹ and generated blue-green substances. Analytical tests by infrared spectroscopy, ultraviolet-visible spectroscopy, X-ray diffraction (XRD), and Mössbauer spectroscopy proved that the blue-green substance was Na₂FeO₃. Na₂FeO₃ may be a more effective water treatment agent. The method used in this not only achieves waste resource recycling, but also offers the potential for large-scale production of Na₂FeO₃.

中文翻译：

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氯离子阳极氧化系统处理油田废水及合成Na2FeO3

本研究研究了阳极氧化系统中采油废水的降解和Na ₂ FeO ₃的生成。采用Ti/Ru-Ir氧化物涂层阳极、NaCl为电解液的电化学氧化技术处理油田废水，使废水中TOC值由210 mg L ^-1降低至115.9 mg L ^-1。同时废水中产生活性氯；随后向电解废水中加入硫酸铁和氢氧化钠，由于混凝作用形成Fe( III )沉淀，进一步将废水中的TOC值降低至25.7 mg L ^-1，并生成蓝绿色物质。经红外光谱、紫外可见光谱、X射线衍射(XRD)、穆斯堡尔光谱分析测试证明，该蓝绿色物质为Na ₂ FeO ₃。Na ₂ FeO ₃可能是一种更有效的水处理剂。该方法不仅实现了废弃物资源化，而且为规模化生产Na ₂ FeO ₃提供了潜力。