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The treatment of petrochemical wastewater via ozone-persulfate coupled catalytic oxidation: mechanism of removal of soluble organic matter

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Abstract

Petrochemical wastewater contains a variety of organic pollutants. Advanced oxidation processes (AOPs) are used for deep petrochemical wastewater treatment with distinct advantages, including the complete mineralization of organic substances, minimal residual byproducts, and compatibility with biological treatment systems. This work evaluates the effectiveness of three methods, namely, ozone, persulfate, and O3-PMS (ozone-persulfate) processes, which were compared to remove soluble organic matter. The O3-PMS process offered significant advantages in terms of organic matter removal efficiency. This process involves ozone dissolution in an aqueous persulfate solution, producing a more significant amount of hydroxyl radicals in comparison to single AOPs. The production of hydroxyl radicals and the synergistic effect of hydroxyl radicals and persulfate radicals were investigated. In the O3-PMS process, transition metal ions were added to understand the mechanism of the O3-PMS coupled catalytic oxidation system. The results showed that when the ozone concentration was in the range of 5 ~ 25 mg/L, the dosage of persulfate was in the range of 0.01 ~ 0.05 mol/L, the dosage of metal compounds was in the range of 0:0 ~ 2:1, and the reaction time was in the range of 0 ~ 2 h; the optimum chemical oxygen demand (CODCr) and total organic content (TOC) removal effect was achieved under the coupled system with an ozone concentration of 10 mg/L, a persulfate dosage of 0.02 mol/L, a 1:2 dosage ratio of between Fe2+ and Cu2+ compounds, and a reaction time of 2 h. Under optimal reaction conditions, the rates of CODCr and TOC removal reached 70% and 79.3%, respectively. Furthermore, the removal kinetics of the O3-PMS coupled catalytic oxidation system was analyzed to optimize the removal conditions of COD and TOC, and the mechanism regulating the degradation of dissolved organic matter was explored by three-dimensional fluorescence and GC–MS technology. Thus, O3-PMS coupled catalytic oxidation is an effective process for the deep treatment of wastewater. The careful selection of transition metal ions serves as a theoretical foundation for the subsequent preparation of catalysts for the ozone persulfate oxidation system, and this study provides a suitable reference for removing organic matter from petrochemical wastewater.

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Data Availability

The data that support the findings of this study are available on request from the corresponding author, Q.Y., upon reasonable request.

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Funding

The authors thank the Gansu Provincial Department of Education university scientific research innovation platform major cultivation project (2024GJPT), for providing the support.

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Authors and Affiliations

  1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China

    Wenjing Guo, Chong Li, Junguang Zhao, Yun Ding & Qing Yang

  2. Beijing Tianhao Kerun Environmental Technology Co, Beijing, 100176, China

    Hongxun Guan

  3. Engineering Research Center for Comprehensive Utilization of Water Resources in Cold and Drought Areas, Ministry of Education, Lanzhou Jiaotong University, Lanzhou, China

    Qing Yang

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  1. Wenjing Guo
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  5. Qing Yang
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Contributions

Conceptualization, W. G.; methodology, W. G.; software, C. L.; validation, J. Z., Y. D., and Q. Y.; data curation, C. L., and Y. D.; writing—original draft preparation, J. Z.; writing—review and editing, W. G. and C. L.; visualization, Y. D. and Q. Y.; supervision, Q. Y. and H. G. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Qing Yang.

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Guo, W., Li, C., Zhao, J. et al. The treatment of petrochemical wastewater via ozone-persulfate coupled catalytic oxidation: mechanism of removal of soluble organic matter. Environ Sci Pollut Res 31, 29400–29414 (2024). https://doi.org/10.1007/s11356-024-32998-4

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