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

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES Chemosphere Pub Date : 2024-11-01 DOI:10.1016/j.chemosphere.2024.143663
Zifang Chi , Wenjing Li , Pengdong Zhang , Huai Li
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Abstract

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.

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在两级垂直流构造湿地中同时去除钒和氮:性能和机制。
钒(V(V))和硝酸盐作为水体中的共生污染物,对生态环境和人类健康构成潜在威胁。本研究旨在揭示在以铁矿石(B-CWs)/锰矿石(C-CWs)-木材为基质的串联式垂直流建造湿地(CWs)中同时去除钒(V)和硝酸盐的可行性。结果表明,B-CWs 在进水量分别为 2 mg/L 和 10 mg/L 时(V(V)/NO3--N=1:5),可实现对 V(V)和 NO3-N 的高效去除。随着 V(V)/NO3--N 比率的增加(V(V)/NO3--N=1:1),B/C-CWs 的综合污染去除效果更好。即使去除硝酸盐(V(V)/NO3--N=1:0),系统也能保持良好的 V(V) 去除能力。高浓度 V(V)(20 毫克/升)明显抑制了 V(V)的去除,随着 V(V)进水量的减少,性能略有恢复。高浓度 NO3--N(10 mg/L)可有效提高 V(V)的去除率,并使 C-CWs 恢复到较好水平。V(IV) 沉淀物/氧化物是主要的还原终产物。大量的 V(V)还原菌和铁锰循环泵确保了 V(V)的高效去除。
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来源期刊
Chemosphere
Chemosphere 环境科学-环境科学
CiteScore
15.80
自引率
8.00%
发文量
4975
审稿时长
3.4 months
期刊介绍: Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.
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