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常规光催化剂静态降解超高COD实际油田污水试探研究
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Abstract:
针对油田污水中有机污染物浓度高、成分复杂、难降解的实际问题，将光催化技术应用于降解超高COD实际油田污水。通过自主合成In2O3@M-TiO2、Ag2O-Co3O4@Mxene、Co-Fe@Mxene和Ag2O-Co3O4@In2O3四种常用的复合光催化剂，针对实际油田污水(初始COD为54,612 mg/L，pH = 10.2)开展了室内静态降解实验与理论分析，明确了不同催化剂油田污水中高浓度有机污染物降解能力，以及催化剂用量、反应时间及温度对COD降低的敏感性。正交实验结果表明，四种光催化剂均能一定程度上有效降解油田污水，在用量100 mg、时间5小时、温度70℃时Ag2O-Co3O4@Mxene降解率达50.26%，COD下降约27,447 mg/L，而In2O3@M-TiO2、Co-Fe@Mxene和Ag2O-Co3O4@In2O3的降解率分别为43.68%、42.15%和45.86%。研究结果可为高浓度有机污染物的有效处理提供一定的技术参考。
To address the practical challenges of oilfield wastewater marked by high concentrations of organic pollutants, complex compositions, and refractory degradation photocatalytic technology was harnessed for the targeted degradation of ultra-high COD actual oilfield wastewater. By self-synthesizing four commonly utilized composite photocatalysts In2O3@M-TiO2, Ag2O-Co3O4@Mxene, Co-Fe@Mxene and Ag2O-Co3O4@In2O3 indoor static degradation experiments and theoretical analyses were conducted using real oilfield wastewater (initial COD: 54,612 mg/L; pH: 10.2). This work thereby clarified the degradation capacities of these catalysts for high-concentration organic pollutants in oilfield wastewater, as well as the sensitivities of COD reduction to key parameters including catalyst dosage, reaction time, and temperature. Orthogonal experimental results revealed that all four photocatalysts demonstrated effective degradation performance for oilfield wastewater to varying degrees. Under optimized conditions (catalyst dosage: 100 mg, reaction time: 5 h, temperature: 70°C), Ag2O-Co3O4@Mxene stood out with a remarkable degradation efficiency of 50.26%, corresponding to a COD reduction of approximately 27,447 mg/L. In comparison, the degradation efficiencies of In？O？@M-TiO？, Co-Fe@Mxene, and Ag2O-Co3O4@In2O3 were 43.68%, 42.15%, and 45.86%, respectively. The research results can provide some technical reference for the effective treatment of high con-centration organic pollutants.
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