Treatment of industrial organic wastewater by ozone-electro-Fenton coupling technology

Industrial organic wastewater has become a major challenge in water pollution control due to its complex composition, high biological toxicity, and refractory biodegradability. Traditional wastewater treatment processes exhibit low efficiency, and single advanced oxidation technologies also present obvious bottlenecks, failing to meet the demand for efficient treatment of complex wastewater. Therefore, the ozone-electro-Fenton coupling process was employed to treat simulated wastewater containing methyl orange or malachite green, and its performance was compared with those of the single ozone process and the single electro-Fenton process. The experimental results show that under the optimal conditions of an ozone generation rate of 1.8 g/h, ozone/air mixed gas flow rate of 500 L/h, and current of 100 mA, after 40 minutes of treatment with the ozone–electro-Fenton coupling process, the decolorization rate of methyl orange reached 94.4% and that of malachite green reached 99.6%, superior to the corresponding values for the single ozone process or the single electro-Fenton process. The results indicate that the coupling process overcomes the bottleneck in single oxidation technologies by synergistically enhancing performance, providing a practical technical solution for the efficient treatment of refractory organic wastewater.