Bioreactor Expansion Affects Microbial Succession of Mixotrophic Acidophiles and Bioremediation of Cadmium-Contaminated Soils
文献类型： 外文期刊
作者： Hao, Xiaodong 1 ; Zhu, Ping 1 ; Liu, Xueduan 2 ; Jiang, Luhua 2 ; Jiang, Huidan 3 ; Liu, Hongwei 2 ; Chen, Zhiqun 4 ;
作者机构： 1.Linyi Univ, Coll Resources & Environm, Shandong Prov Key Lab Water & Soil Conservat & Env, Linyi 276000, Peoples R China
2.Cent South Univ, Sch Minerals Proc & Bioengn, Changsha 410083, Peoples R China
3.Hunan Acad Agr Sci, Biotechnol Res Inst, Changsha 410125, Peoples R China
4.Linyi Univ, Coll Life Sci, Linyi 276000, Peoples R China
关键词： scale-up cultivation; mixotrophic acidophiles; microbial community dynamics; Cd removal; indirect effect
期刊名称：TOXICS （ 影响因子：4.6； 五年影响因子：4.8 ）
ISSN：
年卷期： 2024 年 12 卷 5 期
页码：
收录情况： SCI
摘要： Microbial scale-up cultivation is the first step to bioremediating cadmium (Cd)-contaminated soils at the industrial scale. However, the changes in the microbial community as the bioreactor volume expands and their associations with soil Cd removal remain unclear. Herein, a six-stage scale-up cultivation process of mixotrophic acidophiles was conducted, scaling from 0.1 L to 10 m3, to remediate Cd-contaminated soils. The findings showed that bioreactor expansion led to a delay in sulfur and glucose oxidations, resulting in a reduced decline in solution pH and cell density. There were minimal differences observed in bacterial alpha-diversity and community structure as the bioreactor volume increased, except for the 10 m3 scale. However, bioreactor expansion decreased fungal alpha-diversity, changed the community structure, and simplified fungal community compositions. At the family level, Acidithiobacillaceae and Debaryomycetaceae dominated the bacterial and fungal communities throughout the scale-up process, respectively. Correlation analysis indicated that the indirect effect of mixotrophic acidophiles played a significant role in soil Cd removal. Bacterial community shifts, driven by changes in bioreactor volume, decreased the pH value through sulfur oxidation, thereby indirectly enhancing Cd removal efficiency. This study will contribute to the potential industrial application of mixotrophic acidophiles in bioremediating Cd-contaminated soils.
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