School of Environmental Science and Engineering, Sun Yat-sen University, Guangzhou, 510006, China.
College of Agriculture and Natural Resources, Michigan State University, East Lansing, MI, 48824, USA.
Water Res. 2017 Oct 1;122:471-480. doi: 10.1016/j.watres.2017.06.019. Epub 2017 Jun 9.
This study provides a novel technology for the degradation of tetrabromobisphenol A (TBBPA) via an interaction of Fe redox and a shift of functional microbial community. TBBPA was degraded by integration of synthesized Fe-Ni bimetallic particles and enriched microbial consortium within an aqueous system. This cooperative integration yielded the best TBBPA-degrading capacity (100% removal after treatment for 2 h) and highest TOC-removing efficiency (94.5% removal after treatment for 96 h), as well as the lowest toxicity to Vibrio fischeri (almost 0% growth inhibition during reaction). The synergistic mechanism of integrated system was clarified based on systematical analyses of the degradation processes as well as the shifts in microbial community. Owing to the microbial metabolism and the Fenton-like process of leaked Fe, Fe and Ni from Fe-Ni bimetallic catalyst, reactive oxidative species (ROS), including superoxide (O), hydroxyl radicals (OH) and hydrogen peroxide (HO) were produced and evaluated by multiple techniques. Moreover, the quenching experiments indicated that OH was the major ROS leading to TBBPA degradation, rather than HO or O. Based on the analysis of the 12 detected intermediates, three parallel pathways were proposed. It was clearly revealed that reductive and oxidative debromination, hydroxylation, and β-scission simultaneously occurred in the integrated system. Fe non-randomly accelerated the enrichment of TBBPA-degrading microbes (e.g. Pseudomonas sp. and Citrobacter sp., etc.). Above all, this novel technology has great promise for field-applications for remediation of TBBPA-contaminated field.
本研究通过 Fe 氧化还原和功能微生物群落的转移，提供了一种降解四溴双酚 A（TBBPA）的新技术。在水相体系中，通过合成的 Fe-Ni 双金属颗粒和富集的微生物群落的整合，TBBPA 得以降解。这种协同整合产生了最佳的 TBBPA 降解能力（处理 2 小时后去除率为 100%）和最高的 TOC 去除效率（处理 96 小时后去除率为 94.5%），对发光菌的毒性最低（反应过程中几乎没有 0%的生长抑制）。通过对降解过程和微生物群落变化的系统分析，阐明了集成系统的协同机制。由于微生物代谢和从 Fe-Ni 双金属催化剂中泄漏的 Fe 和 Ni 的芬顿样过程，产生了包括超氧阴离子（O）、羟基自由基（OH）和过氧化氢（HO）在内的活性氧化物种（ROS），并通过多种技术进行了评估。此外，猝灭实验表明，OH 是导致 TBBPA 降解的主要 ROS，而不是 HO 或 O。基于对 12 种检测到的中间产物的分析，提出了三条平行途径。显然，在集成系统中同时发生了还原和氧化脱溴、羟化和 β 断裂。Fe 非随机地加速了 TBBPA 降解微生物（如假单胞菌和柠檬酸杆菌等）的富集。总之，这项新技术在 TBBPA 污染场地修复的现场应用方面具有广阔的前景。
