在两级垂直流构造湿地中同时去除钒和氮：性能和机制。

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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引用次数: 0

摘要

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

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

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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来源期刊

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.