Efficient nitro reduction and dechlorination of 2,4-dinitrochlorobenzene through the integration of bioelectrochemical system into upflow anaerobic sludge blanket: A comprehensive study
Efficient nitro reduction and dechlorination of 2,4-dinitrochlorobenzene through the integration of bioelectrochemical system into upflow anaerobic sludge blanket: A comprehensive study
复制标题
通过将生物电化学系统集成到上流式厌氧污泥床中有效硝基还原和脱氯 2,4-二硝基氯苯：综合研究
DOI：
10.1016/j.watres.2015.10.023
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发表时间：
2016-01-01
期刊：
影响因子：
12.8
通讯作者：
Wang, Lianjun
中科院分区：
文献类型：
--
作者：
Jiang, Xinbai;Shen, Jinyou;Wang, Lianjun
生物电化学系统（BES）耦合上流式厌氧污泥床（UASB）是为了去除顽固污染物而开发的，但缺乏全面的研究。因此，本研究通过连续运行240 d的集成UASB-BES系统，系统地研究了2,4-二硝基氯苯（DNCB）强化还原的可行性，重点关注关键运行参数、系统稳定性以及微生物多样性。结果表明，提供的高电压对 DNCB 的减少有积极的影响，但对过高的电压（>1.6 V）有负面影响。与控制UASB系统相比，UASB-BES系统的抗冲击载荷能力得到加强。高通量测序分析表明，UASB-BES 中 DNCB 的还原增强可归因于还原相关物种、潜在电活性物种和发酵物种的更高多样性和富集。随着运行时间的增加，DNCB 去除率和脱氯率逐渐提高，表明耦合 UASB-BES 系统的性能得到改善。热图显示长期运行过程中微生物群落仅存在细微差异，表明微生物群落的稳定性。观察到的高效稳定的性能凸显了 UASB-BES 耦合系统长期运行和全面应用的潜力，特别是对于高度顽固污染物的去除。 (C) 2015 Elsevier Ltd. 保留所有权利。
Bioelectrochemical system (BES) coupled upflow anaerobic sludge blanket (UASB) was developed for the removal of recalcitrant pollutants but lack of a comprehensive study. Thus in this study an integrated UASB-BES system was operated continuously for 240 d to systematically investigate the feasibility of the enhanced reduction of 2,4-dinitrochlorobenzene (DNCB), with the key operation parameters, the system stability as well as the microbial biodiversity emphasized. The results indicate that high voltage supplied had a positive effect on DNCB reduction but a negative impact for the overhigh voltage (>1.6 V). The ability to resist shock loading was strengthened in the UASB-BES system in comparison with the control UASB system. High-throughput sequencing analysis suggested that the enhanced reduction of DNCB in UASB-BES could be attributed to higher diversity and the enrichment of reduction-related species, potential electroactive species and fermentative species. Both DNCB removal and dechlorination gradually increased with the increase of operation time, indicating the improved performance of the coupled UASB-BES system. The heatmap visualized only slight differences in the microbial community during long-term operation, indicating the stability of the microbial community. The observed efficient and stable performance highlights the potential for long-term operation and full-scale application of the UASB-BES coupled system particularly for highly recalcitrant pollutants removal. (C) 2015 Elsevier Ltd. All rights reserved.