Bioresource Technology ( IF 11.4 ) Pub Date : 2018-07-19 , DOI: 10.1016/j.biortech.2018.07.072 Yufeng Zhao , Xin Cao , Xinshan Song , Zhimiao Zhao , Yuhui Wang , Zhihao Si , Fanda Lin , Yan Chen , Yinjiang Zhang
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 that Proteobacteria and Bacteroidetes at phylum level and Betaproteobacteria, Gammaproteobacteria, and Alphaproteobacteria at class level played an important role in nitrogen removal.
中文翻译:
固定在藻酸钠(SA / Mt-NZVI)中的蒙脱土负载的纳米零价铁增强了垂直流人工湿地(VFCW)中的氮去除
电子供体的缺乏通常会导致人工湿地(CW)的反硝化性能低下。蒙脱石负载的纳米级零价铁固定在藻酸钠(SA / Mt-NZVI)中,作为新型电子给体-受体化合物添加到垂直流人工湿地(VFCW)的反硝化区中,以提高氮的去除率。探讨了SA / Mt-NZVI用量,VFCW的水力停留时间(HRT)和进水的C / N比的关键因素。SA / Mt-NZVI显着提高了VFCW中氮(NO 3 -- N)的去除效率。当SA / MT-NZVI的最佳剂量被设置为2时G和C / N设定为6,最高的NO 3 --N去除效率提高了32.5±1.0%。通过的16S rRNA的微生物群落分析已经表明,变形菌和拟杆菌在门水平和β-变形菌,γ-变形菌和α-变形菌在一流水平的脱氮发挥了重要作用。