CO<sub>2</sub>对<i>A. ferrooxidans</i>活性和次生铁矿物形成的影响

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Abstract The effects of 0.03% (CO₂ content in air), 3%, 6%, 9% and 12% CO₂ concentrations on the activity of Acidithiobacillus ferrooxidans and the formation of secondary iron minerals were studied using shaking flask experiments to simulate the iron-rich and sulfate-rich environment. The pH, Fe²⁺ oxidation rate and oxidation rate, total Fe precipitation rate and secondary iron mineral phase-related indicators were analysed. The results showed that when the concentration of CO₂ was 3%, the ability of bacteria to oxidise Fe²⁺ was the strongest and the oxidation efficiency of Fe²⁺ reached 100% at 72h. At the end of the experiment, the total Fe precipitation rate was the highest, at 42.8%. With the increase in CO₂ concentration, the activity of A. ferrooxidans in each system was inhibited. The final minerals obtained in different CO₂ concentration systems were all jarosite minerals mixed with a small amount of schwertmannite. An appropriate increase in CO₂ concentration is therefore helpful to improve the activity of A. ferrooxidans and promote hydrolysis mineralisation, thus increasing mineral yield. This study provides a theoretical basis for the treatment of acid mine wastewater.

Key words： CO₂ A.ferrooxidans biooxidation secondary iron minerals

Received: 20 October 2023

PACS:

X172

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	Articles by authors
	HUANG Hai-tao
	GENG Kang-hui
	WU Xian-hui
	WANG Chong
	WEI Cai-chun

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HUANG Hai-tao,GENG Kang-hui,WU Xian-hui等. Effect of CO₂ on the activity and formation of secondary iron minerals by Acidithiobacillus ferrooxidans[J]. CHINA ENVIRONMENTAL SCIENCECE, 2024, 44(5): 2652-2659.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2024/V44/I5/2652

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