柱式生物浸出的曝气效果：微生物浓度响应、孔隙演化和硫化铜浸出

IF 3.7 3区生物学 Q2 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Biochemical Engineering Journal Pub Date : 2025-09-04 DOI:10.1016/j.bej.2025.109925

Mingqing Huang , Jiawei Li , Ming Zhang , Fenghao Lu

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引用次数: 0

摘要

通过控制柱实验，研究了堆浸系统的曝气效果。进行了曝气强度为0 ~ 150 L/h的柱状生物浸出试验，采用核磁共振进行孔隙演化分析。结果表明，强制曝气增加了溶解氧浓度，优化了下层孔隙结构，缩短了细菌从滞后期到对数期的过渡时间，延长了固定期。矿物浸出率与微生物浓度呈正相关，铜浸出表现出顺序滞后、快速和稳定的阶段。曝气增强Fe³ +再生和微生物催化氧化，改善硫化铜浸出。曝气效率为1.59 % ~ 10.4 %，与曝气强度呈负相关。柱级研究结果建立了强制曝气条件下孔隙-微生物-矿物相互作用的基本机制，为工业堆操作提供了关键参数，在工业堆操作中，氧传递限制严重限制了铜的回收效率。

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Aeration effectiveness in column bioleaching: Microbial concentration responses, porosity evolution and copper sulfide leaching

This study investigates aeration effectiveness in heap bioleaching systems through controlled column experiments. Column bioleaching tests with aeration intensities of 0–150 L/h were conducted, employing nuclear magnetic resonance for porosity evolution analysis. Results demonstrate that forced aeration increased dissolved oxygen concentrations and optimized pore structure in lower sections, shortening the bacterial transition from lag to logarithmic phase while extending stationary phases. Mineral leaching rates correlated positively with microorganism concentrations, with copper leaching exhibiting sequential lag, rapid, and stable phases. Aeration enhanced Fe³ ⁺ regeneration and microbially catalyzed oxidation, improving copper sulfide leaching. Aeration effectiveness ranged from 1.59 % to 10.4 %, inversely correlated with aeration intensity. The column-scale findings establish fundamental mechanisms for pore-microbe-mineral interactions under forced aeration, providing critical parameters for scaling to industrial heap operations where oxygen transfer limitations significantly constrain copper recovery efficiency.

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来源期刊

Biochemical Engineering Journal 工程技术-工程：化工

CiteScore

7.10

自引率

5.10%

发文量

380

审稿时长

34 days

期刊介绍： The Biochemical Engineering Journal aims to promote progress in the crucial chemical engineering aspects of the development of biological processes associated with everything from raw materials preparation to product recovery relevant to industries as diverse as medical/healthcare, industrial biotechnology, and environmental biotechnology. The Journal welcomes full length original research papers, short communications, and review papers* in the following research fields: Biocatalysis (enzyme or microbial) and biotransformations, including immobilized biocatalyst preparation and kinetics Biosensors and Biodevices including biofabrication and novel fuel cell development Bioseparations including scale-up and protein refolding/renaturation Environmental Bioengineering including bioconversion, bioremediation, and microbial fuel cells Bioreactor Systems including characterization, optimization and scale-up Bioresources and Biorefinery Engineering including biomass conversion, biofuels, bioenergy, and optimization Industrial Biotechnology including specialty chemicals, platform chemicals and neutraceuticals Biomaterials and Tissue Engineering including bioartificial organs, cell encapsulation, and controlled release Cell Culture Engineering (plant, animal or insect cells) including viral vectors, monoclonal antibodies, recombinant proteins, vaccines, and secondary metabolites Cell Therapies and Stem Cells including pluripotent, mesenchymal and hematopoietic stem cells; immunotherapies; tissue-specific differentiation; and cryopreservation Metabolic Engineering, Systems and Synthetic Biology including OMICS, bioinformatics, in silico biology, and metabolic flux analysis Protein Engineering including enzyme engineering and directed evolution.