Degradation of antibiotics in wastewater has become an urgent issue to prevent subsequent pollution. As a typical advanced oxidation process, ozonation technology has been employed to degrade sulfamethoxazole (SMX) due to its high efficiency and environmental friendliness. Considering the depleted solubility of ozone in water, improving ozone mass transfer was crucial to SMX wastewater degradation by ozonation. In our previous work (Ind. Eng. Chem. Res, 2024, 63, 14391–14402), we developed a submerged rotating packed bed with efficient gas dispersion ability and promising gas–liquid mass transfer capacity, which was further employed in the present work to intensify SMX degradation. Wire mesh packings with different mesh numbers were compared to optimize the ozone-water mass transfer performance. Results indicated that the packing with a larger mesh number and a larger specific surface area possessed inferior mass transfer performance, presumably derived from the aggravated flow resistance. The k_La increased by 70.7% when packing mesh number decreased from 30 to 12. Afterward, SMX ozonation was conducted with the SMX degradation efficiency of more than 93% in 24 min under various operating conditions. Nine intermediates were detected by LC-MS, and three SMX degradation pathways were speculated consequently. The solution fluorescence was effectively reduced, and the toxicity of the intermediates was predicted to decrease. Ozone utilization outcomes demonstrated that the ozone utilization efficiency in SRPB was improved by about 40% compared with conventional RPBs.

中文翻译：

---

浸没式旋转填充床反应器中磺胺甲噁唑降解的强化


废水中抗生素的降解已成为防止后续污染的紧迫问题。臭氧化技术作为一种典型的高级氧化工艺，由于其高效和环保性而被用于降解磺胺甲噁唑 （SMX）。考虑到臭氧在水中的溶解度耗尽，改善臭氧传质对于臭氧化降解 SMX 废水至关重要。在我们之前的工作 （Ind. Eng. Chem. Res， 2024， 63， 14391–14402） 中，我们开发了一种具有高效气体分散能力和有前途的气液传质能力的浸没式旋转填充床，该填料床在目前的工作中进一步用于加强 SMX 降解。比较了不同目数的金属丝网填料，以优化臭氧-水传质性能。结果表明，具有较大网格数和较大比表面积的填料具有较差的传质性能，这可能是由于流动阻力加大所致。当保压网目数从 30 减少到 12 时，k_La 增加了 70.7%。之后，在各种操作条件下，SMX 臭氧化在 24 min 内以超过 93% 的降解效率进行。LC-MS 检测了 9 种中间体，并因此推测了 3 种 SMX 降解途径。溶液荧光有效降低，预测中间体的毒性降低。臭氧利用结果表明，与传统 RPB 相比，SRPB 中的臭氧利用效率提高了约 40%。