Coupling of iron shavings into the anaerobic system for enhanced 2,4-dinitroanisole reduction in wastewater
Coupling of iron shavings into the anaerobic system for enhanced 2,4-dinitroanisole reduction in wastewater
复制标题
将铁屑耦合到厌氧系统中以增强废水中 2,4-二硝基苯甲醚的减少
DOI：
10.1016/j.watres.2016.06.002
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发表时间：
2016-09-15
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：
Ou, Changjin;Shen, Jinyou;Wang, Lianjun
将铁粉填充到厌氧反应器中，可提高废水中难降解污染物的去除率，但由于铁粉本身存在易沉淀、传质能力差等缺点，限制了铁粉在厌氧反应器中的应用。为了解决上述问题，本研究将铁屑填充到升流式厌氧污泥床（UASB）中，以提高2，4-二硝基苯甲醚（DNAN）的去除率，并强调系统的稳定性和微生物的多样性。结果表明，铁屑耦合UASB系统能显著提高DNAN的还原率和2，4-二氨基苯甲醚（DAAN）的生成率。此外，在UASB反应器中投加铁屑也增强了UASB的抗环境胁迫能力。与对照UASB反应器中松散粗糙的污泥表面相比，耦合系统中的污泥在铁屑模拟下呈现出致密、刚性和颗粒状的外观。高通量测序分析表明，铁屑耦合UASB反应器中微生物群落多样性显著高于对照UASB反应器。此外，物种相关的DNA还原和甲烷生产的耦合系统中富集。长期稳定运行的结果显示了铁屑耦合厌氧污泥法处理含硝基芳烃废水的全面应用潜力。(C)2016爱思唯尔有限公司版权所有。
Packing of iron powder into anaerobic system is attractive for enhancing removal of recalcitrant pollutants from wastewater, but is limited by various inherent drawbacks of iron powder, such as easy precipitation and poor mass transfer. To address the above issues, iron shavings were packed into an upflow anaerobic sludge blanket (UASB) for enhancing 2,4-dinitroanisole (DNAN) reduction in this study, with system stability and microbial biodiversity emphasized. The results showed that both DNAN reduction and 2,4-diaminoanisole (DAAN) formation could be notably improved in the iron shavings coupled UASB system. Moreover, the ability to resist environmental stress was also strengthened through the addition of iron shavings in the UASB reactor. Compared with a loose and rough surface of the sludge in the control UASB reactor, the sludge in the coupled system presented a compact, rigid and granular appearance under iron shavings simulation. Furthermore, high throughput sequencing analysis indicated that the diversity of microbial community in the iron shavings coupled UASB system was significantly higher than that of the control UASB reactor. Additionally, species related to DNAN reduction and methane production were enriched in the coupled system. The observed long-term stable performance highlights the full-scale application potential of iron shavings coupled anaerobic sludge process for the treatment of nitroaromatic compounds containing wastewater. (C) 2016 Elsevier Ltd. All rights reserved.