Universidad Tecnológica de la Habana "José Antonio Echeverría" CUJAE, Avenida 114, Marianao, La Habana, Cuba.
Laboratoire de Génie Chimique, Université de Toulouse CNRS, INPT, UPS, Toulouse, France.
Environ Sci Pollut Res Int. 2020 Jan;27(2):1246-1255. doi: 10.1007/s11356-018-3559-9. Epub 2018 Nov 27.
Fluoroquinolones are extensively used in medicine due to their antimicrobial activity. Their presence in water inhibits microorganism activity in conventional wastewater treatment plants. This study aims to evaluate the technical feasibility of applying heterogeneous catalytic ozonation to eliminate ciprofloxacin (CIP) as a representative of fluoroquinolone antibiotics normally present in municipal wastewater discharges. Experiments were conducted in a semi-batch stirred slurry reactor, using 0.7 L of 100 mg L CIP aqueous solution, at pH 3 and 30 °C. Experimental results show that single ozonation can easily oxidise CIP molecules (68%) within the first 5 min, leading to the generation of refractory oxidation by-products. However, when heterogeneous catalytic ozonation is applied using iron oxide supported on MFI synthetic zeolite, total degradation of CIP is observed at 5 min and a higher mineralisation rate is obtained. A novel sequential process is developed for CIP mineralisation. In a first step, a flash single ozonation is applied and CIP molecules are broken down. Then, a catalytic ozonation step is conducted by adding the Fe/MFI catalyst into the reactor. As a result of catalyst addition, 44% of Total Organic Carbon (TOC) is eliminated within the first 15 min, compared to single ozonation where only 13% of TOC removal is reached in the same time. The application of this sequential process to a real wastewater effluent spiked with CIP leads to 52% of TOC removal.
氟喹诺酮类药物由于其抗菌活性而在医学中被广泛使用。它们在水中的存在会抑制传统废水处理厂中微生物的活性。本研究旨在评估多相催化臭氧化技术应用于消除环丙沙星（CIP）的技术可行性，CIP 是市政污水排放中常见的氟喹诺酮类抗生素的代表。实验在半分批搅拌淤浆反应器中进行，使用 0.7 L、浓度为 100 mg/L 的 CIP 水溶液，在 pH 3 和 30°C 下进行。实验结果表明，单一臭氧化在最初的 5 分钟内很容易氧化 CIP 分子（68%），导致生成难降解的氧化副产物。然而，当使用负载在 MFI 合成沸石上的氧化铁进行多相催化臭氧化时，CIP 在 5 分钟内完全降解，并获得更高的矿化率。开发了一种用于 CIP 矿化的新型连续工艺。在第一步中，进行快速的单一臭氧化，CIP 分子被分解。然后，通过向反应器中添加 Fe/MFI 催化剂，进行催化臭氧化步骤。由于催化剂的添加，在最初的 15 分钟内，总有机碳（TOC）的去除率达到 44%，而在相同时间内，单一臭氧化的 TOC 去除率仅为 13%。将该连续工艺应用于含有 CIP 的实际废水，TOC 的去除率达到 52%。
