Study on the characteristics of Cd<sup>2+</sup> adsorption of mineral processing wastewater by micro-organisms supported by hydrothermal carbon

ZHOU Gang; ZHANG Xinyuan; LI Shuailong; MENG Qunzhi; YAO Jianjun; ZHANG Jinhao; ZHEN Hui

doi:10.12438/cst.2024-0042

Volume 53 Issue 4

Apr. 2025

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COAL SCIENCE AND TECHNOLOGY > 2025 > 53(4): 414-433. > DOI: 10.12438/cst.2024-0042

ZHOU Gang，ZHANG Xinyuan，LI Shuailong，et al. Study on the characteristics of Cd²⁺ adsorption of mineral processing wastewater by micro-organisms supported by hydrothermal carbon[J]. Coal Science and Technology，2025，53（4）：414−433. DOI: 10.12438/cst.2024-0042

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Study on the characteristics of Cd²⁺ adsorption of mineral processing wastewater by micro-organisms supported by hydrothermal carbon

ZHOU Gang^{1, 2,},
ZHANG Xinyuan^{1, 2},
LI Shuailong^{1, 2},
MENG Qunzhi^{1, 2},
YAO Jianjun^{1, 2, ,},
ZHANG Jinhao^{1, 2},
ZHEN Hui^{1, 2}

1.
College of Safety and Environment Engineering, Shandong University of Science and Technology, Qingdao 266590, China
2.
Provincial and ministerial joint construction of national key laboratory cultivation base for mine disaster prevention and control, Shandong University of Science and Technology, Qingdao 266590, China

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Received Date: January 08, 2023
Available Online: April 11, 2025

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Abstract

Abstract

With the development of science and technology and the improvement of human living standards, gold has been widely used in various industries, but with the mining of gold mines, a large number of mineral processing wastewater rich in heavy metal ions has caused damage to the environment. Especially the heavy metal cadmium (Cd), because of its strong biological toxicity and high enrichment seriously harm human health and ecological safety. Therefore, in order to effectively control cadmium pollution in gold mine wastewater, based on immobilized microbial technology, this study used the concentration gradient method of heavy metals to screen the in situ dominant bacteria with strong tolerance to Cd²⁺ from the sludge of gold mine wastewater pool, and used hydrothermal carbon as the immobilized carrier. The immobilized microbial activated carbon spheres (HC-PVA-SA-MOI) were prepared by a composite fixation method combining adsorption-embedding and cross-linking. The microscopic morphology, elemental composition, surface functional groups, specific surface area and porosity of HC-PVA-SA-MOI were analyzed by SEM, XPS and BET characterization experiments. The results showed that HC-PVA-SA-MOI was spherical in uniform size, mainly composed of C, O, N, Na and other elements. The specific surface area was 134.1821 m²/g, and the in-situ dominant strains were successfully attached to the surface of hydrothermal carbon. The effects of pH, adsorption time, temperature, initial concentration, dosage of adsorbent and coexisting ions on the adsorption performance of HC-PVA-SA-MOI were studied through the optimization experiment of adsorption conditions. The results showed that when the initial concentration of Cd²⁺ was 100 mg/L, the dosage of HC-PVA-SA-MOI was 5 g/L, and the pH of the solution was 6. When the adsorption time is 48 h and the temperature is 30 ℃, the best adsorption conditions are HC-PVA-SA-MOI, and the removal rate of Cd²⁺ is 98.59%. In addition, the adsorption kinetics experiment and adsorption isotherm model experiment found that the adsorption of Cd²⁺ by HC-PVA-SA-MOI was more consistent with the quasi-second-order kinetic model and Langmuir model, indicating that the adsorption mechanism of Cd²⁺ by HC-PVA-SA-MOI was mainly homogeneous monolayer chemisorption. The analysis of microbial diversity and subcellular structure showed that Halomonas played the main role in the adsorption of Cd²⁺, and the main role of microbial structure was cell wall and cell membrane. The results show that the removal rate of Cd²⁺ in wastewater by HC-PVA-SA-MOI can still reach 90.11% after 5 sorption-desorption cycles, which has good reuse performance. Based on its sustainability, low cost and excellent adsorption properties, HC-PVA-SA-MOI is expected to be used as an adsorbent for the practical treatment of Cd²⁺ in gold mine wastewater.
- Cadmium-containing gold mine wastewater,
- hydrothermal carbon,
- microorganism,
- immobilization technology,
- physicochemical adsorption

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Study on the characteristics of Cd²⁺ adsorption of mineral processing wastewater by micro-organisms supported by hydrothermal carbon

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Study on the characteristics of Cd²⁺ adsorption of mineral processing wastewater by micro-organisms supported by hydrothermal carbon