The oily wastewater generated during the oil extraction process has complex components, including crude oil, suspended solids, heavy metals and refractory organic matter. If discharged directly, it seriously pollutes water bodies and soil, threatening the ecological environment and human health. It is one of the core problems of environmental protection management in the oil industry. Existing oily wastewater treatment processes (such as single coagulation, flotation, and membrane separation) generally have problems such as low treatment efficiency, large dosage of chemicals, high operating costs, and easy generation of secondary pollution. It is difficult to meet the stringent emission standards and industrial application requirements. This paper first sorts out the research status and shortcomings of oily wastewater treatment, and then proposes a technical solution of "pretreatment optimization-deep treatment coupling-multi-dimensional performance evaluation". By optimizing the coagulant formula to improve the pretreatment effect, the "coagulation-ultrafiltration membrane separation" coupling process is constructed to strengthen deep treatment. At the same time, a comprehensive performance evaluation system covering treatment efficiency, cost, and stability is established. The experimental investigation results show that when the initial oil concentration is 500 mg/L (simulating the actual oil production wastewater concentration), the oil removal rate of the coupling process reaches 99.0%, the COD removal rate is 87.6%, and the suspended solids removal rate is 98.2%, with the removal rate significantly improved.

Guangchao Zhi. Improvement and Efficiency Evaluation of Oily Wastewater Treatment Technology in Oil Production. International Journal of Frontiers in Engineering Technology (2025), Vol. 7, Issue 4: 70-76. https://doi.org/10.25236/IJFET.2025.070410.

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