A newly discovered function of nitrate reductase in chemoautotrophic vanadate transformation by natural mackinawite in aquifer

被引：131
作者：
He, Chao [1 ]
Zhang, Baogang [1 ]
Lu, Jianping [1 ]
Qiu, Rui [1 ]
机构：
[1] China Univ Geosci Beijing, Sch Water Resources & Environm, MOE Key Lab Groundwater Circulat & Environm Evolu, Beijing 100083, Peoples R China
来源：
WATER RESEARCH | 2021年 / 189卷
基金：
北京市自然科学基金; 中国国家自然科学基金;
关键词：
Chemoautotrophic bioprocess; Vanadate; Bioreduction; Mackinawite; Aquifer; ORGANIC-CARBON SOURCES; MICROBIAL REDUCTION; VANADIUM V; BIOTIC PROCESSES; CR(VI) REMOVAL; SULFUR; DENITRIFICATION; PRECIPITATION; GROUNDWATER; COMMUNITY;
D O I：
10.1016/j.watres.2020.116664
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Mackinawite (FeS), a widely-distributed natural reducing mineral, can donate electron for various (bio)processes. However, little is known about mackinawite-driven chemoautotrophic bioreduction of toxic vanadate [V(V)] in aquifer. This study demonstrates that V(V) is successfully bioreduced by mackinawite under anaerobic condition via 150-d operation of constructed aquifer. Complete V(V) removal was achieved at the initial concentration of 10 mg/L and flow rate of 0.125 mL/min. Fluctuant hydrochemistry and hydrodynamics affected V(V) removal performance. Biotic activity was identified as the major contribution to V(V) transformation (76.4 +/- 1.01%). Chemoautotrophic genera (e.g., Thiobacillus) could oxidize FeS coupled to direct V(V) reduction independently. Heterotrophic V(V) reducers (e.g., Pseudomonas and Spirochaeta) could also achieve V(V) detoxification by utilizing metabolic intermediates synthesized by autotrophic Fe(II) oxidizers (e.g., Thiobacillus) and S(-II) oxidizing genera (e.g., Sulfuricurvum). Gene abundance and enzymatic activity tests confirmed that nitrate reductase gene napA functioned crucially in chemoautotrophic V(V) reduction by Fe(II) and S(-II) donating electron. V(V) was reduced to insoluble V(IV) while elements in mackinawite were oxidized to Fe(III) and SO42-. This study reveals the coupling of iron, sulfur and vanadium in biogeochemical cycling, and offers a promising strategy for remediation of V(V)-polluted aquifer. (C) 2020 Elsevier Ltd. All rights reserved.
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页数：9
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