Enhanced NOx removal performance and microbial community shifts in an oxygen-resistance chemical absorption-biological reduction integrated system
Enhanced NOx removal performance and microbial community shifts in an oxygen-resistance chemical absorption-biological reduction integrated system
复制标题
抗氧化学吸收-生物还原集成系统中增强的氮氧化物去除性能和微生物群落变化
DOI：
10.1016/j.cej.2016.01.044
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发表时间：
2016-04-15
影响因子：
15.1
通讯作者：
Zhang, Shihan
中科院分区：
文献类型：
--
作者：
Li, Wei;Li, Meifang;Zhang, Shihan
以乙二胺四乙酸亚铁为溶剂的化学吸收-生物还原（CABR）一体化工艺是一种很有前途的脱氮工艺。然而，烟道气中的氧气具有极大的潜力来延迟NOx的去除。本研究建立了一种接种富集菌的耐氧CABR系统。与常规CABR系统相比，该系统具有启动周期短、脱氮效果好等特点。还调查了微生物群落的分类群和多样性对氧气的响应。高通量测序分析表明，肠球菌属、狭义梭菌属、螯合球菌属、岩藻单胞菌属、埃希氏菌/志贺菌属、嗜铜菌属是主要的细菌类群，在无氧条件下，嗜铜菌（岩藻单胞菌属、嗜铜菌属、螯合球菌属、肠球菌属）占优势，占总菌数的63.29%。氧浓度的变化导致优势菌群的变化。例如，肠球菌属、彼得单胞菌属和贪铜菌属分别在0体积%、6体积%和10体积%氧的存在下占优势。微生物群落的多样性也沿着不同的氧气水平的气体流动路径变化。虽然氧浓度的增加显着影响的类群和分布的微生物群落，增强CABR系统的NOx去除效率没有显着改变，因为在高氧浓度的情况下，高物种丰富度。(C)2016爱思唯尔B. V.保留所有权利。
The chemical absorption-biological reduction (CABR) integrated process, which employed ferrous ethylenediaminetetraacetate as a solvent, is promising for NOx removal. However, oxygen in the flue gas has a great potential to retard the NOx removal. In this work, an oxygen-resistance CABR system inoculated with enriched culture was established. It features a shorter start-up period and a better performance of NOx removal compared with the conventional CABR system. The microbial community shifts in taxa and diversity in response to oxygen were also investigated. High-throughput sequencing analysis showed that Enterococcus, Clostridium sensu stricto, Chelatococcus, Petrimonas, Escherichia/Shigella, Cupriavidus were the major groups of bacteria, and denitrifying bacteria (Petrimonas, Cupriavidus, Chelatococcus, Enterococcus), accounting for 63.29% of the total bacteria, were dominant in the absence of oxygen. Variation in oxygen concentration resulted in the change of the dominant bacteria. For example, Enterococcus, Petrimonas, and Cupriavidus were dominant in the presence of 0 vol%, 6 vol%, and 10 vol % oxygen, respectively. The diversity of the microbial community also varied along the gas flow path at the different levels of oxygen. Although the increase in oxygen concentration significantly impacted the taxa and distribution of the microbial community, the NOx removal efficiency of the enhanced CABR system was not noticeably changed because of the high species richness under the high oxygen concentration case. (C) 2016 Elsevier B.V. All rights reserved.