Effects of chromate on nitrogen removal and microbial community in two-stage vertical-flow constructed wetlands

被引：0
作者：
Chi Z. [1 ]
Zhang P. [1 ]
Hou L. [1 ]
Li H. [2 ]
Liang S. [2 ]
Song A. [2 ]
机构：
[1] Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun
[2] Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun
来源：
Chemosphere | 2023年 / 345卷
基金：
中国国家自然科学基金;
关键词：
Cr(VI); Microbial communities; Nitrogen; Simultaneous removal; Two-stage vertical-flow constructed wetlands;
D O I：
10.1016/j.chemosphere.2023.140556
中图分类号：
学科分类号：
摘要：
Nitrogen and chromium (Cr(VI)) pollution in waterbodies pose great threats to human health, and a cost-effective alternative with Cr(VI) and nitrogen simultaneous removal is still needed. This study investigated the influence of Cr(VI) on nitrogen removal in the two-stage vertical-flow constructed wetlands (TS-VFCWs) along with iron ore and woodchip, and explored relationship between Cr(VI) and nitrogen removal. The results showed that efficient Cr(VI) and nitrogen removal were simultaneously achieved in TS-VFCWs together with iron-ore and woodchip under 2 mg/L-Cr(VI), whereas 10 mg/L-Cr(VI) gave significant and recoverable inhibition of nitrogen removal. Cr(VI) supplementation promoted the beneficiation of Cr(VI)-reducing/resistant bacteria IMCC26207 and Bryobacter on iron-ore. Woodchip enriched Cr(VI)-reducing bacteria Streptomyces and Thiobacillus. XRD and XPS showed that abundant bound-Cr existed in the surface of iron ore and woodchip, and Cr(III) precipitation/oxide was the major product. High abundances of nitrifying and autotrophic/heterotrophic denitrifying bacteria ensured good nitrogen removal at Cr(VI) stress. © 2023 Elsevier Ltd
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