College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China.
College of Architecture and Environment, Sichuan University, Chengdu 610065, PR China.
Bioresour Technol. 2023 Oct;385:129462. doi: 10.1016/j.biortech.2023.129462. Epub 2023 Jul 8.
The commonly used antibiotic ciprofloxacin (CIP) can significantly inhibit and interfere with the anaerobic digestion (AD) performance. This work was developed to explore the effectiveness and feasibility of nano iron-carbon composites to simultaneously enhance methane production and CIP removal during AD under CIP stress. The results demonstrated that when the nano-zero-valent iron (nZVI) content immobilized on biochar (BC) was 33% (nZVI/BC-33), the CIP degradation efficiency reached 87% and the methanogenesis reached 143 mL/g COD, both higher than Control. Reactive oxygen species analysis demonstrated that nZVI/BC-33 could effectively mitigate microorganisms subjected to the dual redox pressure from CIP and nZVI, and reduce a series of oxidative stress reactions. The microbial community depicted that nZVI/BC-33 enriched functional microorganisms related to CIP degradation and methane production and facilitated direct electron transfer processes. Nano iron-carbon composites can effectively alleviate the stress of CIP on AD and enhance methanogenesis.
常用抗生素环丙沙星（CIP）会显著抑制和干扰厌氧消化（AD）性能。本工作旨在探索纳米铁碳复合材料在 CIP 胁迫下 AD 中同时提高甲烷产量和去除 CIP 的有效性和可行性。结果表明，当固定在生物炭（BC）上的纳米零价铁（nZVI）含量为 33%（nZVI/BC-33）时，CIP 的降解效率达到 87%，产甲烷量达到 143 mL/g COD，均高于对照。活性氧分析表明，nZVI/BC-33 可以有效缓解微生物同时受到 CIP 和 nZVI 的双重氧化还原压力，并减少一系列氧化应激反应。微生物群落表明，nZVI/BC-33 富集了与 CIP 降解和甲烷生成相关的功能微生物，并促进了直接电子转移过程。纳米铁碳复合材料可以有效缓解 CIP 对 AD 的压力，提高产甲烷量。
