Generation behavior of extracellular polymeric substances and its correlation with extraction efficiency of valuable metals and change of process parameters during bioleaching of spent petroleum catalyst

Chu, Huichao; Wang, Jia; Tian, Bingyang; Qian, Can; Niu, Tianqi; Qi, Shiyue; Yang, Yiran; Ge, Yajun; Dai, Xiaodong; Xin, Baoping

doi:10.1016/j.chemosphere.2021.130006

Cited by 17 publications

(6 citation statements)

References 38 publications

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“…EPS mainly comprises proteins, polysaccharides, fatty acids, and metal ions, and multiple components promote mineral leaching [ 116 , 117 , 118 , 119 , 120 ]. EPS interacts with iron-containing minerals through the formation of P-O-Fe bonds, thereby inducing microbial adhesion and EPS accumulation [ 97 ].…”

Section: Regulation Of Qs In Bioleachingmentioning

confidence: 99%

Roles and Regulation of Quorum Sensing of Acidophiles in Bioleaching: A Review

Luo,

Li,

Chen

et al. 2024

Microorganisms

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Bioleaching has gained significant attention as a cost-effective and environmentally friendly approach for extracting metals from low-grade ores and industrial byproducts. The application of acidophiles in bioleaching has been extensively studied. Among the various mechanisms leaching microorganisms utilize, quorum sensing (QS) is pivotal in regulating their life activities in response to population density. QS has been confirmed to regulate bioleaching, including cell morphology, community structure, biofilm formation, and cell metabolism. Potential applications of QS have also been proposed, such as increasing mineral leaching rates by adding signaling molecules. This review is helpful for comprehensively understanding the role of QS in bioleaching and promoting the practical application of QS-based strategies in bioleaching process optimization.

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Section: Regulation Of Qs In Bioleachingmentioning

confidence: 99%

Roles and Regulation of Quorum Sensing of Acidophiles in Bioleaching: A Review

Luo,

Li,

Chen

et al. 2024

Microorganisms

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“…In the later stage, protein-like substances decreased and humus-like substances (Regions 3 and 5) gradually increased. It was demonstrated that EPS is a dynamic system, and different components change with time (Chu et al 2021). In addition, it was reported that the farreaching significance of EPS in the bioleaching of A. ferrooxidans, and the content of EPS are related to the dissolution rate of minerals, and different components play different roles in the bioleaching process (Gehrke et al 2001;Sand and Gehrke 2006;Usher et al 2010).…”

Section: Eps-mediated Bioleaching Processmentioning

confidence: 99%

Bioleaching of rare-earth elements from phosphate rock using Acidithiobacillus ferrooxidans

Tian

Song

et al. 2022

Letters in Applied Microbiology

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Phosphate rock containing rare‐earth elements (REEs) is considered one of the most promising potential secondary sources of REEs, as evidenced by large tonnages of phosphate rock mined annually. The bioleaching of REEs from phosphate rock using Acidithiobacillus ferrooxidans was done for the first time in this study, and it was found to be greater than abiotic leaching and was more environmentally friendly. The result showed that the total leaching rate of REEs in phosphate rock was 28·46% under the condition of 1% pulp concentration and pH = 2, and the leaching rates of four key rare earths, Y, La, Ce and Nd, were 35·7, 37·03, 27·92 and 32·53% respectively. The bioleaching process was found to be accomplished by bacterial contact and Fe2+ oxidation. The blank control group which contained Fe2+ was able to leach some of the rare earths, indicating that the oxidation of Fe2+ may affect the leaching of rare earths. X‐ray diffraction analysis showed that the minerals were significantly altered and the intensity of the diffraction peaks of dolomite and apatite decreased significantly after microbial action compared to the blank control, and it was observed that bacteria adhere to the mineral surface and the minerals become smooth and angular after bioleaching by scanning electron microscope, indicating that bacteria have a further effect on the rock based on Fe2+ oxidation. Finally, Fourier transform infrared spectroscopy and three‐dimensional excitation‐emission matrix fluorescence spectra analysis showed that extracellular polymeric substances participate in the bioleaching process.

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“…The appearance of these three peaks can prove that bacteria were adsorbed on the surface of biochar. At the same time, the composition of this extracellular polymer (EPS) could help microorganisms resist the oxidative stress caused by high loading of metal elements (Chu et al 2021). The EPS substances promote the acclimatization of microorganisms to the external environment to a certain extent, accelerating the subsequent biosorption and bioleaching (Ye et al 2021).…”

Section: Ftir Analysismentioning

confidence: 99%

Enhanced effect of biochar on leaching vanadium and copper from stone coal tailings by Thiobacillus ferrooxidans

Dong

Chong

Lin

2021

Environ Sci Pollut Res

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Among the many extraction technologies for recovering metal resources from tailings, bioleaching technology is gradually showing its momentum. In our research, the enhanced effect of biochar on the bioleaching of stone coal tailings by Thiobacillus ferrooxidans (T. ferrooxidans) has been explored. In the static bioleaching experiment for 10 days, the leaching rate of vanadium (V) and copper (Cu) increased by 26.8% and 21.0% respectively after adding 5 g/L biochar. The dynamic bioleaching experiment further verified that under the promotion of biochar, the 44 day cumulative leaching rate of V and Cu increased by 15.3% and 14.5%, respectively. The promoting effect of biochar on T. ferrooxidans was mainly reflected in two aspects. The unique porous structure of biochar created a microenvironment for free microorganisms for inhabitation, while storing abundant nutrients. Biochar can also act as an excellent electronic medium to promote electron transfer, improving the oxidation ability of T. ferrooxidans on Fe 2+ . Furthermore, the presence of biochar may effectively inhibit the formation of jarosite precipitation on tailings in bioleaching, thereby improving the dissolution of tailings and the release of metal elements. This study demonstrates that biochar-enhanced bioleaching may be an efficient and environmentally friendly method for recovering metal resources from tailings.

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Generation behavior of extracellular polymeric substances and its correlation with extraction efficiency of valuable metals and change of process parameters during bioleaching of spent petroleum catalyst

Cited by 17 publications

References 38 publications

Roles and Regulation of Quorum Sensing of Acidophiles in Bioleaching: A Review

Roles and Regulation of Quorum Sensing of Acidophiles in Bioleaching: A Review

Bioleaching of rare-earth elements from phosphate rock using Acidithiobacillus ferrooxidans

Enhanced effect of biochar on leaching vanadium and copper from stone coal tailings by Thiobacillus ferrooxidans

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