当前位置:
X-MOL 学术
›
Environ. Pollut.
›
论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Natural attenuation mechanism of hexavalent chromium in a wetland: Zoning characteristics of abiotic and biotic effects
Environmental Pollution ( IF 8.9 ) Pub Date : 2021-06-21 , DOI: 10.1016/j.envpol.2021.117639 Kaidi Jiang 1 , Jia Zhang 1 , Zhihui Deng 1 , Samuel Barnie 2 , Jingjie Chang 1 , Yawen Zou 1 , Xiangyu Guan 3 , Fei Liu 1 , Honghan Chen 1
Environmental Pollution ( IF 8.9 ) Pub Date : 2021-06-21 , DOI: 10.1016/j.envpol.2021.117639 Kaidi Jiang 1 , Jia Zhang 1 , Zhihui Deng 1 , Samuel Barnie 2 , Jingjie Chang 1 , Yawen Zou 1 , Xiangyu Guan 3 , Fei Liu 1 , Honghan Chen 1
Affiliation
Natural wetland has great retention effect on Cr(VI) migration due to its abiotic and biotic reduction abilities, however, the zoning characteristics of dominating reduction mechanism along Cr(VI) pollution plume in wetland is still unclear. In this study, a Cr(VI) contaminated natural wetland was explored to investigate the distributions of Cr and Fe in groundwater and sediment, and their relationship with microorganisms according to metagenomics, aiming to reveal the natural attenuation mechanism of Cr(VI) from the perspective of zoning characteristics of abiotic and biotic effects. The wetland was divided into contaminated zone, transition zone and uncontaminated zone according to the contamination states of groundwater and sediment. At the upstream of contaminated zone, Cr(VI) concentration in groundwater was as high as 26.7 mg L, which has significant inhibition effect on microbial growth, and thus chemical reduction of Cr(VI) by natural organic matters (NOMs) dominated in this area, leading to the increasing of H/C and O/C ratios of NOMs because of the oxidation of aromatic moieties. At the downstream of contaminated zone, Cr(VI) concentration in groundwater decreased to less than 4.46 mg L resulting from dilution and attenuation, but the microbial community was altered substantially, chromate resistant bacteria with , , and genes were enriched, such as , and , and thus the direct microbial reduction of Cr(VI) dominated in this area. While at the transition zone, which is located at the front edge of the pollution plume, Cr(VI) could only reached in this area intermittently, and the microbial community remained similar to that of the uncontaminated zone, dominated by and phylum with dissimilatory ferric iron reduction capacity, and thus Cr(VI) was indirectly reduced by Fe intermediately in this area.
中文翻译:
湿地六价铬的自然衰减机制:非生物和生物效应的分区特征
天然湿地因其非生物和生物还原能力而对Cr(VI)迁移具有很大的滞留作用,但湿地中Cr(VI)污染羽流的主导还原机制的分区特征仍不清楚。本研究以Cr(VI)污染的自然湿地为研究对象,通过宏基因组学研究Cr和Fe在地下水和沉积物中的分布及其与微生物的关系,旨在从Cr(VI)污染的自然湿地中揭示Cr(VI)的自然衰减机制。非生物和生物效应分区特征的视角。根据地下水和沉积物的污染状况,将湿地划分为污染区、过渡区和未污染区。污染区上游地下水中Cr(VI)浓度高达26.7 mg·L,对微生物生长具有显着的抑制作用,天然有机物(NOMs)化学还原Cr(VI)为主。由于芳香族部分的氧化,NOMs 的 H/C 和 O/C 比值增加。污染区下游,地下水中Cr(VI)浓度因稀释和衰减而下降至4.46 mg·L以下,但微生物群落发生较大改变,具有 、 、 、 基因的耐铬菌富集,如 、 、 ,因此 Cr(VI) 的直接微生物还原在该区域占主导地位。而在位于污染羽流前沿的过渡区,Cr(VI)只能间歇性地到达该区域,微生物群落与未污染区相似,以异化铁门为主。铁的还原能力,因此 Cr(VI) 在此区域被 Fe 间接还原。
更新日期:2021-06-21
中文翻译:
湿地六价铬的自然衰减机制:非生物和生物效应的分区特征
天然湿地因其非生物和生物还原能力而对Cr(VI)迁移具有很大的滞留作用,但湿地中Cr(VI)污染羽流的主导还原机制的分区特征仍不清楚。本研究以Cr(VI)污染的自然湿地为研究对象,通过宏基因组学研究Cr和Fe在地下水和沉积物中的分布及其与微生物的关系,旨在从Cr(VI)污染的自然湿地中揭示Cr(VI)的自然衰减机制。非生物和生物效应分区特征的视角。根据地下水和沉积物的污染状况,将湿地划分为污染区、过渡区和未污染区。污染区上游地下水中Cr(VI)浓度高达26.7 mg·L,对微生物生长具有显着的抑制作用,天然有机物(NOMs)化学还原Cr(VI)为主。由于芳香族部分的氧化,NOMs 的 H/C 和 O/C 比值增加。污染区下游,地下水中Cr(VI)浓度因稀释和衰减而下降至4.46 mg·L以下,但微生物群落发生较大改变,具有 、 、 、 基因的耐铬菌富集,如 、 、 ,因此 Cr(VI) 的直接微生物还原在该区域占主导地位。而在位于污染羽流前沿的过渡区,Cr(VI)只能间歇性地到达该区域,微生物群落与未污染区相似,以异化铁门为主。铁的还原能力,因此 Cr(VI) 在此区域被 Fe 间接还原。