Enhanced sulfamethoxazole removal using anaerobic and aerobic sequencing batch reactor with magnetite
Enhanced sulfamethoxazole removal using anaerobic and aerobic sequencing batch reactor with magnetite
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DOI：
10.22616/erdev.2022.21.tf026
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发表时间：
2022-05
期刊：
影响因子：
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通讯作者：
Tonggang Shen;Y. Inagaki;Hiroki Koike;Ranjusha Vaddake Pariyarath;M. Komori;Y. Sakakibara
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文献类型：
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作者：
Tonggang Shen;Y. Inagaki;Hiroki Koike;Ranjusha Vaddake Pariyarath;M. Komori;Y. Sakakibara
磺胺甲恶唑 (SMX) 是最常用的抗生素之一。传统废水处理厂去除此类抗生素的能力有限，存在抗生素抗性基因传播到环境中的风险。在本研究中，为了在中性条件下进行生物芬顿反应，提出了一种补充磁铁矿的厌氧和好氧序批式反应器（SBR）。该工艺旨在增强对抗生素以及化学需氧量（COD）等有机污染物的处理，无需外部添加过氧化氢（H2O2）。将厌氧和好氧混合污泥置于两个相同的含磁铁矿和不含磁铁矿的 SBR 中交替厌氧和好氧条件下，处理含有 1 mg·L 磺胺甲恶唑的合成废水。实验结果表明，在有氧条件下，在含有磁铁矿的系统中，H2O2 水平增加至 34.9 μM，并且在两种 SBR 中观察到相似的 COD 去除率。此外，在含有磁铁矿的SBR中观察到SMX处理增强，而在不含磁铁矿的SBR中SMX的去除效率逐渐下降。实验结果表明，有氧条件下H2O2的产生和可产生羟基自由基的生物芬顿反应导致SBR中磁铁矿对SMX的强化处理。磁铁矿作为催化剂在氧化还原过程中没有溶解，表明其可重复使用的可能性。需要进一步研究来分析所提出的 SBR 中的反应机制和动力学。
Sulfamethoxazole (SMX) is one of the most frequently used antibiotics. The capacity of conventional wastewater treatment plants to remove such antibiotics is limited, posing a risk of antibiotic resistance genes spreading into the environment. In this study, to carry out biological Fenton reaction under neutral conditions, an anaerobic and aerobic sequencing batch reactor (SBR) supplemented with magnetite was proposed. This process aims to enhance the treatment of antibiotics in addition to organic pollutants such as chemical oxygen demand (COD) without external addition of hydrogen peroxide (H2O2). Mixed anaerobic and aerobic sludge was exposed to alternative anaerobic and aerobic conditions in two identical SBRs with and without magnetite to treat the synthetic wastewater containing 1 mg·L sulfamethoxazole. The experimental results showed that the H2O2 level increased to 34.9 μM under aerobic conditions in the system with magnetite, and similar COD removal was observed in both SBRs. Moreover, enhanced SMX treatment was observed in the SBR with magnetite, while removal efficiencies of SMX gradually decreased in the SBR without magnetite. The experimental results demonstrate that H2O2 generation under aerobic conditions and biological Fenton reaction that can produce hydroxyl radicals led to the enhanced treatment of SMX in the SBR with magnetite. Magnetite as the catalyst was not dissolved during the redox process, indicating the possibility of its reusability. Further studies are needed to analyse the reaction mechanisms and the kinetics in the proposed SBR.