Liu Qidi, Hou Jun, Wu Jun, Miao Lingzhan, You Guoxiang, Ao Yanhui
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
Key Laboratory of Integrated Regulation and Resources Development on Shallow Lakes of Ministry of Education, College of Environment, Hohai University, Nanjing 210098, China.
J Hazard Mater. 2022 Feb 5;423(Pt B):127063. doi: 10.1016/j.jhazmat.2021.127063. Epub 2021 Sep 11.
The inefficiency of conventional biological treatment for removing sulfamethoxazole (SMX) is posing potential risks to ecological environments. In this study, an intimately coupled photocatalysis and biodegradation (ICPB) system consisting of Fe/g-CN and biofilm was fabricated for the treatment of synthetic domestic wastewater containing SMX. The results showed that this ICPB system could simultaneously remove 96.27 ± 5.27% of SMX and 86.57 ± 3.06% of COD, which was superior to sole photocatalysis (SMX 100%, COD 4.2 ± 0.74%) and sole biodegradation (SMX 42.21 ± 0.86%, COD 95.1 ± 0.18%). Contributors to SMX removal in the ICPB system from big to small include LED photocatalysis, biodegradation, LED photolysis, and adsorption effect of the carrier, while COD removal was largely ascribed to biodegradation. Increasing initial SMX concentration inhibits SMX removal rate, while increasing photocatalyst dosage accelerates SMX removal rate, and both had no impact on COD removal. Our analysis of biofilm activity showed that microorganisms in this ICPB system maintained a high survival rate and metabolic activity, and the microbial community structure of the biofilm remained stable, with Nakamurella and Raoultella being the two dominant genera of the biofilm. This work provides a new strategy to effectively treat domestic wastewater polluted by antibiotics.
传统生物处理法去除磺胺甲恶唑（SMX）效率低下，对生态环境构成潜在风险。本研究构建了一种由Fe/g-CN和生物膜组成的光催化与生物降解紧密耦合（ICPB）系统，用于处理含SMX的模拟生活污水。结果表明，该ICPB系统能同时去除96.27±5.27%的SMX和86.57±3.06%的化学需氧量（COD），优于单独的光催化（SMX去除率100%，COD去除率4.2±0.74%）和单独的生物降解（SMX去除率42.21±0.86%，COD去除率95.1±0.18%）。ICPB系统中对SMX去除的贡献从大到小依次为LED光催化、生物降解、LED光解和载体的吸附作用，而COD的去除主要归因于生物降解。提高SMX初始浓度会抑制SMX去除率，而增加光催化剂用量则会加速SMX去除率，且二者对COD去除均无影响。我们对生物膜活性的分析表明，该ICPB系统中的微生物保持了较高的存活率和代谢活性，生物膜的微生物群落结构保持稳定，其中中村氏菌属和拉乌尔氏菌属是生物膜的两个优势菌属。这项工作为有效处理受抗生素污染的生活污水提供了一种新策略。
