School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou, 730070, China.
Engineering Research Center for Comprehensive Utilization of Water Resources in Cold and Drought Areas, Ministry of Education, Lanzhou Jiaotong University, Lanzhou, China.
Environ Sci Pollut Res Int. 2024 Apr;31(20):29400-29414. doi: 10.1007/s11356-024-32998-4. Epub 2024 Apr 4.
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 O-PMS (ozone-persulfate) processes, which were compared to remove soluble organic matter. The O-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 O-PMS process, transition metal ions were added to understand the mechanism of the O-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 (COD) 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 Fe and Cu compounds, and a reaction time of 2 h. Under optimal reaction conditions, the rates of COD and TOC removal reached 70% and 79.3%, respectively. Furthermore, the removal kinetics of the O-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, O-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.
石化废水中含有多种有机污染物。高级氧化工艺（AOPs）用于深度处理石化废水具有明显的优势，包括有机物的完全矿化、最小的残留副产物以及与生物处理系统的兼容性。本工作评估了三种方法的效果，即臭氧、过硫酸盐和 O-PMS（臭氧-过硫酸盐）工艺，它们在去除可溶性有机物方面进行了比较。O-PMS 工艺在有机物去除效率方面具有显著优势。该工艺涉及臭氧在过硫酸盐溶液中的溶解，与单一 AOPs 相比，产生了更多的羟基自由基。研究了羟基自由基的产生和羟基自由基与过硫酸盐自由基的协同作用。在 O-PMS 工艺中，添加过渡金属离子以了解 O-PMS 偶联催化氧化体系的机制。结果表明，当臭氧浓度在 5 ～ 25 mg/L 范围内，过硫酸盐用量在 0.01 ～ 0.05 mol/L 范围内，金属化合物用量在 0:0 ～ 2:1 范围内，反应时间在 0 ～ 2 h 范围内时；在浓度为 10 mg/L 的臭氧、用量为 0.02 mol/L 的过硫酸盐、1:2 摩尔比的 Fe 和 Cu 化合物和 2 h 的反应时间的偶联体系下，达到了最佳的化学需氧量（COD）和总有机含量（TOC）去除效果。在最佳反应条件下，COD 和 TOC 的去除率分别达到 70%和 79.3%。此外，分析了 O-PMS 偶联催化氧化系统的去除动力学，以优化 COD 和 TOC 的去除条件，并通过三维荧光和 GC-MS 技术探索了调节溶解有机物降解的机制。因此，O-PMS 偶联催化氧化是一种有效的废水深度处理工艺。过渡金属离子的精心选择为后续制备臭氧过硫酸盐氧化体系的催化剂提供了理论基础，本研究为去除石化废水中的有机物提供了合适的参考。
