Montmorillonite supported nanoscale zero-valent iron immobilized in sodium alginate (SA/Mt-NZVI) enhanced the nitrogen removal in vertical flow constructed wetlands (VFCWs)
Montmorillonite supported nanoscale zero-valent iron immobilized in sodium alginate (SA/Mt-NZVI) enhanced the nitrogen removal in vertical flow constructed wetlands (VFCWs)
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蒙脱石负载的纳米级零价铁固定在海藻酸钠 (SA/Mt-NZVI) 中增强了垂直流人工湿地 (VFCW) 的脱氮效果
DOI：
10.1016/j.biortech.2018.07.072
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发表时间：
2018
影响因子：
11.4
通讯作者：
Zhang Yinjiang
中科院分区：
文献类型：
--
作者：
Zhao Yufeng;Cao Xin;Song Xinshan;Zhao Zhimiao;Wang Yuhui;Si Zhihao;Lin F;a;Chen Yan;Zhang Yinjiang
缺乏电子供体是人工湿地反硝化效果较差的主要原因。在垂直流人工湿地(VFCWs)的反硝化区添加蒙脱土负载海藻酸钠固定的纳米级零价铁(SA/Mt-NZVI)作为新型的电子供体-受体化合物，以提高系统的脱氮效果。考察了SA/Mt-NZVI投加量、VFCW水力停留时间、进水C/N比等关键因素对处理效果的影响。SA/Mt-NZVI显著提高了VFCW的脱氮效率(NO3-−-N)。当SA/Mt-NZVI的最佳投加量为2 g，C/N为6时，最高的NO3-−-N的去除效率提高了32.5 ± 1.0%。16S rRNA的微生物群落分析表明，菌门水平上的变形杆菌和类杆菌，以及类别水平上的β变形杆菌、γ变形杆菌和α变形杆菌在脱氮中起着重要的作用。
Lacking of electron donor generally causes the low denitrification performance of constructed wetlands (CWs). Montmorillonite supported nanoscale zero-valent iron immobilized in sodium alginate (SA/Mt-NZVI) as novel electron donor-acceptor compounds were added in the denitrification zone of vertical flow constructed wetlands (VFCWs) to enhance the nitrogen removal. The key factors of the SA/Mt-NZVI dosage, the hydraulic retention time (HRT) of VFCWs, and the C/N ratios of influent were explored. SA/Mt-NZVI significantly improved the nitrogen (NO3−-N) removal efficiency in VFCWs. When the optimal dosage of SA/Mt-NZVI was set as 2 g and the C/N was set as 6, the highest NO3−-N removal efficiency was improved by 32.5 ± 1.0%. The microbial community analysis of by 16S rRNA had revealed thatProteobacteriaandBacteroidetesat phylum level andBetaproteobacteria,Gammaproteobacteria, andAlphaproteobacteriaat class level played an important role in nitrogen removal.