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Wang X, Zhao X, Zhou Y, Zhang X, Xu C, Duan H, Wang R, Lu X. Research on the decomposition mechanisms of lithium silicate ores with different crystal structures by autotrophic and heterotrophic bacteria. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 925:171762. [PMID: 38508270 DOI: 10.1016/j.scitotenv.2024.171762] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Revised: 02/18/2024] [Accepted: 03/14/2024] [Indexed: 03/22/2024]
Abstract
Ores serve as energy and nutrient sources for microorganisms. Through complex biochemical processes, microorganisms disrupt the surface structure of ores and release metal elements. However, there is limited research on the mechanisms by which bacteria with different nutritional modes act during the leaching process of different crystal structure ores. This study evaluated the leaching efficiency of two types of bacteria with different nutritional modes, heterotrophic bacterium Bacillus mucilaginosus (BM) and autotrophic bacterium Acidithiobacillus ferrooxidans (AF), on different crystal structure lithium silicate ores (chain spodumene, layered lepidolite and ring elbaite). The aim was to understand the behavioral differences and decomposition mechanisms of bacteria with different nutritional modes in the process of breaking down distorted crystal lattices of ores. The results revealed that heterotrophic bacterium BM primarily relied on passive processes such as bacterial adsorption, organic acid corrosion, and the complexation of small organic acids and large molecular polymers with metal ions. Autotrophic bacterium AF, in addition to exhibiting stronger passive processes such as organic acid corrosion and complexation, also utilized an active transfer process on the cell surface to oxidize Fe2+ in the ores for energy maintenance and intensified the destruction of ore lattices. As a result, strain AF exhibited a greater leaching effect on the ores compared to strain BM. Regarding the three crystal structure ores, their different stacking modes and proportions of elements led to significant differences in structural stability, with the leaching effect being highest for layered structure, followed by chain structure, and then ring structure. These findings indicate that bacteria with different nutritional modes exhibit distinct physiological behaviors related to their nutritional and energy requirements, ultimately resulting in different sequences and mechanisms of metal ion release from ores after lattice damage.
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Affiliation(s)
- Xiaopeng Wang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Xingqing Zhao
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China.
| | - Yucheng Zhou
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Xinyi Zhang
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Chao Xu
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Huaiyu Duan
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Rucheng Wang
- State Key Laboratory for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, PR China
| | - Xiancai Lu
- State Key Laboratory for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing 210023, PR China
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Wang F, Long G, Zhou JL. Enhanced green remediation and refinement disposal of electrolytic manganese residue using air-jet milling and horizontal-shaking leaching. JOURNAL OF HAZARDOUS MATERIALS 2024; 465:133419. [PMID: 38183942 DOI: 10.1016/j.jhazmat.2023.133419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 11/28/2023] [Accepted: 12/29/2023] [Indexed: 01/08/2024]
Abstract
The reclamation and reuse of electrolytic manganese residue (EMR) as a bulk hazard solid waste are limited by its residual ammonia nitrogen (NH4+-N) and manganese (Mn2+). This work adopts a co-processing strategy comprising air-jet milling (AJM) and horizontal-shaking leaching (HSL) for refining and leaching disposal of NH4+-N and Mn2+ in EMR. Results indicate that the co-use of AJM and HSL could significantly enhance the leaching of NH4+-N and Mn2+ in EMR. Under optimal milling conditions (50 Hz frequency, 10 min milling time, 12 h oscillation time, 400 rpm rate, 30 ℃ temperature, and solid-to-liquid ratio of 1:30), NH4+-N and Mn2+ leaching efficiencies were optimized to 96.73% and 97.35%, respectively, while the fineness of EMR was refined to 1.78 µm. The leaching efficiencies of NH4+-N and Mn2+ were 58.83% and 46.96% higher than those attained without AJM processing. The AJM used strong airflow to give necessary kinetic energy to EMR particles, which then collided and sifted to become refined particles. The AJM disposal converted kinetic energy into heat energy upon particle collisions, causing EMR phase transformation, and particularly hydrated sulfate dehydration. The work provides a fire-new and high-efficiency method for significantly and simply leaching NH4+-N and Mn2+ from EMR.
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Affiliation(s)
- Fan Wang
- School of Civil Engineering, Central South University, 68 South Shaoshan Road, Changsha, Hunan 410075, China
| | - Guangcheng Long
- School of Civil Engineering, Central South University, 68 South Shaoshan Road, Changsha, Hunan 410075, China.
| | - John L Zhou
- School of Civil Engineering, Central South University, 68 South Shaoshan Road, Changsha, Hunan 410075, China; Centre for Green Technology, School of Civil and Environmental Engineering, University of Technology Sydney, Sydney, NSW 2007, Australia
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Zhao X, Zhou Y, Ding C, Wang X, Zhang X, Wang R, Lu X. Lithium extraction from typical lithium silicate ores by two bacteria with different metabolic characteristics: Experiments, mechanism and significance. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 347:119082. [PMID: 37783078 DOI: 10.1016/j.jenvman.2023.119082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2023] [Revised: 07/24/2023] [Accepted: 08/30/2023] [Indexed: 10/04/2023]
Abstract
Microorganisms obtain inorganic nutrients or energy from specific minerals to selectively weather minerals, but few studies on the differences in metabolic components of different functional bacteria lead to different weathering effects. This study evaluated the leaching effects of two bacteria with distinct metabolic characteristics on lithium silicate minerals with different structures. We aimed to understand the microscopic mechanism of crystal destruction of lithium silicate minerals with different structures under the action of microorganisms. The results showed that the metabolites produced by an acid producing silicate strain Raoultella sp. Z107 (strain Z107) had a high content of organic acids, among which lactic acid was up to about 11 g/L. Bacillus mucilaginosus 21,699 (strain BM) secreted capsular polysaccharide with a high content of 14.84 mg/L. The metabolic activities of the two strains were significantly different. Through the analysis of the leaching residue, it was found that the lithium silicate minerals were acid etched, interlayer domains expanded, crystallinity decreased, and metal bonds were broken under the action of bacteria. The dissolution of lithium silicate minerals by bacteria is a combination of bacterial adsorption, organic acid corrosion, and complexation of small molecular organic acids and macromolecular polymers with metal ions. The acid erosion and complexation effects of organic acids are greater than the single complexation of capsular polysaccharides, and the layered lepidolite is more likely to be decomposed by the weathering of bacterial metabolites than the chain structure spodumene. These results indicate that the diversity of metabolic activity of bacteria from different sources and the sequence and decomposition mechanism of metal ions released from minerals after lattice destruction are also different. Microorganisms decompose minerals for energy and nutrients, and eventually become the main players in the transformation of elements in biogeology.
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Affiliation(s)
- Xingqing Zhao
- School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, PR China.
| | - Yucheng Zhou
- School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, PR China
| | - Congcong Ding
- School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, PR China
| | - Xiaopeng Wang
- School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, PR China
| | - Xinyi Zhang
- School of Environmental Science and Engineering, Changzhou University, Changzhou, 213164, PR China
| | - Rucheng Wang
- State Key Laboratory for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, PR China
| | - Xiancai Lu
- State Key Laboratory for Mineral Deposit Research, School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, PR China
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Yang Y, Feng Y, Li H, Xu C, Jiang S, Ma R, Wang B. Pretreatment of deep-sea bacteria for reverse flotation of magnesite tailings: cleaner production, behavior and mechanism. Sep Purif Technol 2022. [DOI: 10.1016/j.seppur.2022.122685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Zhang Y, Yang G, Lu C, Xu H, Wu J, Zhou Z, Song Y, Guo J. Insight into the enhancing mechanism of silica nanoparticles on denitrification: Effect on electron transfer and microbial metabolism. CHEMOSPHERE 2022; 300:134510. [PMID: 35398075 DOI: 10.1016/j.chemosphere.2022.134510] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Revised: 03/24/2022] [Accepted: 04/01/2022] [Indexed: 06/14/2023]
Abstract
Although silica nanoparticles (SiNPs) are produced in large numbers for industrial manufacturing and engineering applications, the effect of SiNPs on biotransformation in the environment is still not clear. In the current study, the effect of SiNPs in enhancing denitrification was investigated, and its mechanism was explored from the perspectives of electron transfer, microbial metabolism and bacterial community structure for the first time. Batch experiments showed that a concentration of SiNPs ranging from 0.05 to 5 g/L enhanced the bioreduction of nitrate. The mechanism study showed that SiNPs accelerated the extracellular electron transfer in the denitrification process due to their electron donating capacity, bonding action, and the secretion of more electron shuttles. During the denitrification process, SiNPs promoted metabolic activity, which mainly consists of promoting enzyme activities and electron transport system activity; these metabolic activity assays were positively correlated with SiNPs according to the structural equation modeling analysis. Moreover, SiNPs affected the composition of the microbial community, including denitrifying functional bacteria, silicon-activating bacteria and electron transfer active bacteria exhibiting a synergistic symbiosis. In addition, it was shown, by investigating two functional group-modified SiNPs, that the carboxyl modified SiNPs had the potential to be applied in nitrogen removal due to their performance and non-toxicity. This study presented a better insight into the role of SiNPs in biological transformation.
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Affiliation(s)
- Ying Zhang
- School of Environmental and Municipal Engineering, Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China
| | - Ge Yang
- Zhuhai Orbita Aerospace Science & Technology Co., LTD, Baisha Road 1, Zhuhai, 519000, China
| | - Caicai Lu
- Experimental and Practical Innovation Education Center, Beijing Normal University, Jinfeng Road 18, Zhuhai, 519000, China; School of Environmental and Municipal Engineering, Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China.
| | - Hong Xu
- Zhuhai Orbita Aerospace Science & Technology Co., LTD, Baisha Road 1, Zhuhai, 519000, China
| | - Jiaqi Wu
- Zhuhai Orbita Aerospace Science & Technology Co., LTD, Baisha Road 1, Zhuhai, 519000, China
| | - Ziyuan Zhou
- School of Environmental and Municipal Engineering, Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China
| | - Yuanyuan Song
- School of Environmental and Municipal Engineering, Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China
| | - Jianbo Guo
- School of Environmental and Municipal Engineering, Tianjin Key Laboratory of Aquatic Science and Technology, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China; School of Civil Engineering and Architecture, Taizhou University, Taizhou, 318000, China.
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