Pyrite-Based Cr(VI) Reduction Driven by Chemoautotrophic Acidophilic Bacteria

被引:0
|
作者
Liu, Xinxing [1 ]
Wu, Haiyan [1 ]
Gan, Min [1 ]
Qiu, Guanzhou [1 ]
机构
[1] Cent South Univ, Dept Biol, Sch Minerals Proc & Bioengn, Key Lab Biohydromet,Minist Educ, Changsha, Peoples R China
来源
FRONTIERS IN MICROBIOLOGY | 2020年 / 10卷
基金
中国国家自然科学基金;
关键词
pyrite; Cr(VI) reduction; Acidithiobacillus ferrooxidans; pH; passivation effect; HEXAVALENT CHROMIUM; ACIDITHIOBACILLUS-FERROOXIDANS; OXIDATION; IRON; PH; CHALCOPYRITE; PASSIVATION; KINETICS; REMOVAL;
D O I
10.3389/fmicb.2019.03082
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Cr(VI) is considered as a priority pollutant, and its remediation has attracted increasing attention in the environmental area. In this study, the driving of pyrite-based Cr(VI) reduction by Acidithiobacillus ferrooxidans was systematically investigated. The results showed that pyrite-based Cr(VI) reduction was a highly proton-dependent process and that pH influenced the biological activity. The passivation effect became more significant with an increase in pH, and there was a decrease in Cr(VI) reduction efficiency. However, Cr(VI) reduction efficiency was enhanced by inoculation with A. ferrooxidans. The highest reduction efficiency was achieved in the biological system with a pH range of 1-1.5. Pyrite dissolution and reactive site regeneration were promoted by A. ferrooxidans, which resulted in the enhanced effect in Cr(VI) reduction. The low linear relevancy between pH and Cr(VI) dosage in the biological system indicated a complex interaction between bacteria and pyrite. Secondary iron mineral formation in an unfavorable pH environment inhibited pyrite dissolution, but the passivation effect was relieved under the activity of A. ferrooxidans due to S/Fe oxidization. The balance between Cr(VI) reduction and biological activity was critical for sustainable Cr(VI) reduction. Pyrite-based Cr(VI) remediation driven by chemoautotrophic acidophilic bacteria is shown to be an economical and efficient method of Cr(VI) reduction.
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页数:12
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