Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system
Enhancing 2,6-dichlorophenol degradation and nitrate removal in the nano-zero-valent iron (nZVI) solid-phase denitrification system
复制标题
增强纳米零价铁 (nZVI) 固相反硝化系统中 2,6-二氯苯酚的降解和硝酸盐去除
DOI：
10.1016/j.chemosphere.2021.132249
复制
发表时间：
2021
期刊：
影响因子：
8.8
通讯作者：
Jie Zhang
中科院分区：
文献类型：
--
作者：
Mingrun Li;Dong Wei;Zhaoran Zhang;Dawei Fan;Bin Du;Huiping Zeng;Dong Li;Jie Zhang
纳米零价铁(NZVI)作为一种典型的纳米材料，近年来在废水处理和与生物反应器的组合中得到了广泛的应用。利用nZVI耦合反硝化系统研究了nZVI强化反硝化污泥对有毒物质的降解和系统性能的影响。NZVI耦合反硝化系统具有较好的抗2，6-二氯环己烷冲击能力，出水NO_2-−和NO_3-−浓度均低于2.0 mg/L，同时nZVI的投加使反硝化系统能在15d内快速适应2，6-二氯环己烷的毒性环境，对2，6-二氯苯酚的降解率达到99.9%。在2，6-DCP环境中，nZVI与反硝化污泥耦合后，SMP的释放量减少，可改善出水水质。核磁共振波谱分析表明，nZVI的加入改变了反硝化污泥中EPS的结构。经过90天的运行，反硝化污泥中的优势菌发生了很大的变化。此外，在反硝化系统中，毛霉是降解2，6-二氯苯酚的优势菌。在NZVI存在下，具有硝酸盐还原、氮呼吸、硝酸盐呼吸和亚硝酸盐呼吸的功能细菌比例增加，进一步揭示了NZVI强化反硝化的机理。
Nano-zero-valent iron (nZVI), as a typical nano-material, has been recently used in wastewater treatment and combination with bioreactors. Using nZVI coupled denitrification system research the effect and influence of nZVI enhanced denitrification sludge on the degradation of toxic compounds and system performance. The nZVI coupled denitrification system showed better resistance to 2,6-DCP impact, and the concentrations of effluent NO2−and NO3−were below 2.0 mg/L. At the same time, the addition of nZVI enabled the denitrification system to quickly adapt to the toxic environment of 2,6-DCP within 15 days, and the degradation efficiency of 2,6-DCP reached 99.9%. The released SMP reduced after nZVI coupled with denitrification sludge in 2,6-DCP environment, which could improve the effluent water quality. Nuclear magnetic resonance spectroscopy showed that the addition of nZVI would change the structure of EPS in denitrification sludge. After 90 days of operation, the dominant bacteria in the denitrifying sludge have undergone great changes. Moreover,Thauerawas responsible as the dominant bacteria for degrading 2,6-DCP in the denitrification system. The increased in the proportion of functional bacteria with nitrate_reduction, nitrogen_respiration, nitrate_respiration and nitrite_respiration in the presence of NZVI further reveals the mechanism of enhanced denitrification.