Simultaneous removal of vanadium and nitrogen in two-stage vertical flow constructed wetlands: Performance and mechanisms

被引：0
作者：
Chi, Zifang [1 ]
Li, Wenjing [1 ]
Zhang, Pengdong [1 ]
Li, Huai [2 ]
机构：
[1] Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun
[2] State Key Laboratory of Black Soils Conservation and Utilization, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun
来源：
Chemosphere | 2024年 / 367卷
基金：
中国国家自然科学基金;
关键词：
Constructed wetlands; Microbial mechanisms; Nitrogen; Simultaneous removal; Vanadium (V);
D O I：
10.1016/j.chemosphere.2024.143663
中图分类号：
学科分类号：
摘要：
Vanadium (V(V)) and nitrate, as co-concomitant pollutants in water bodies, pose potential threats to the eco-environment and human health. This study was to reveal the feasibility of simultaneous removal of V(V) and nitrate in the series-wound vertical flow constructed wetlands (CWs) with iron ore (B-CWs)/manganese ore (C-CWs)-wood substrates. The results showed that B-CWs could achieve efficient V(V) and NO3−-N removal with the influent of 2 and 10 mg/L (V(V)/NO3−-N = 1:5), respectively. With the increase of V(V)/NO3−-N ratio (V(V)/NO3−-N = 1:1), B/C-CWs exhibited better combined pollution removal. Even when nitrate was removed (V(V)/NO3−-N = 1:0), the systems could maintain a good capacity for V(V) removal. High V(V) (20 mg/L) significantly inhibited V(V) removal, with a slight recovery of the performance as the decrease of V(V) influent. High NO3−-N concentration (10 mg/L) effectively enhanced V(V) removal and restored C-CWs to the better level. V(IV) precipitates/oxides were the main reducing end-products. High abundance of V(V)-reducing bacteria and iron/manganese cycling pumps ensured efficient V(V) removal. © Elsevier Ltd
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