The enhanced effect of Acidithiobacillus ferrooxidans on pyrite based Cr(VI) reduction

Gan, Min; Li, Jiayu; Sun, Shengjie; Cao, Yuanyan; Zheng, Zhihe; Zhu, Jianyu; Liu, Xinxing; Wang, Jun; Qiu, Guanzhou

doi:10.1016/j.cej.2018.02.014

Cited by 52 publications

(4 citation statements)

References 40 publications

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“…Fast and orderly mineral dissolution determines whether pyrite-based Cr(VI) reduction can be utilized at an industrial scale. According to our previous research, the activity of Acidithiobacillus ferrooxidans significantly enhanced sulfur oxidization and pyrite dissolution as well as the corresponding Cr(VI) reduction (Gan et al, 2018;Wang et al, 2019). It should be noted that the influence of pH on pyrite-based Cr(VI) reduction remains unclear, especially in the complex system where A. ferrooxidans is present.…”

Section: Introductionmentioning

confidence: 93%

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

Liu

Gan

et al. 2020

Front. Microbiol.

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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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Section: Introductionmentioning

confidence: 93%

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

Liu

Gan

et al. 2020

Front. Microbiol.

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“…It has been demonstrated that the bioleaching of pyrite could be effectively accelerated in the presence of microorganisms like Acidithiobacillus ferrooxidans. 83 They promote the cleavage of disulfide bonds in pyrite and oxidize the intermediate sulfur to sulfate, finally resulting in pyrite bioleaching. Anammox is a mixed bacterial culture system with the coexistence of a variety of microorganisms.…”

Section: Interaction Mechanism Between Pyritementioning

confidence: 99%

How Pyrite Interacts with Anammox: Mechanisms and Application

Feng

Liu

et al. 2022

ACS EST Water

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Anaerobic ammonium oxidation (Anammox) is a promising biotechnology involving the nitrogen removal process owing to its benefits, such as high efficiency and low cost. However, problems are faced during its application, including long cell doubling time, sensitivity to environmental factors, and generation of nitrate as a byproduct. With the ability to promote bacterial growth and reduce the nitrate byproduct, pyrite (FeS2) has remarkable potential in enhancing the Anammox process. It will also expand the nitrogen removal pathway by coupling with the iron–nitrogen–sulfur cycle. Few pioneering studies on using pyrite for Anammox enhancement have been published recently, and critical information has yet to be summarized. This Review provides a comprehensive and systematic overview of the role of pyrite in the Anammox process. It offers the possibility of coupling pyrite with Anammox to achieve a more efficient nitrogen removal.

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“…Pyrite (cubic FeS2) is rich in the earth's crust, and has a strong reducibility [11]. Gan et al used pyrite to reduce Cr(VI) to Cr(Ⅲ) [12]. Thus, using pyrite as a reducing agent is beneficial for the recovery of manganese from manganese ore.…”

Section: Introductionmentioning

confidence: 99%

“…Wen et al found that microwaves can effectively reduce the passivation layer formed by the sulfur element in chalcopyrite [31]. Pyrite has similar chemical properties to chalcopyrite and has the problem of a passivation layer during the leaching process [12]. Hence, the use of microwave heating may reduce the energy and time consumed for the recovery process; meanwhile, it may inhibit the formation of a passivation layer in the process of pyrite reduction, which will increase the efficiency of the leaching process of pyrolusite.…”

Section: Introductionmentioning

confidence: 99%