Treatment of Agate Dyeing Wastewater Using an Immobilized Gel Mixture with Nano-Fe3O4 Sulfate-Reducing Bacteria

Guo, Xuying; Jiang, Guoliang; Fu, Saiou; Hu, Zhiyong; Di, Junzhen; Dong, Yanrong; Liu, Ying

doi:10.32604/jrm.2021.015878

Cited by 2 publications

(2 citation statements)

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“…For this reason, researchers have introduced microbial immobilization techniques [ 15 , 16 ], where microorganisms are physically and chemically immobilized on specific carriers to enable them to maintain their activity while being resistant to adverse environmental influences, thus improving their ability to remove pollutants [ 17 , 18 ]. Many researchers have tried to prepare composites by organically combining free SRB with loading materials to improve the tolerance of SRB to pH, heavy metal toxicity, and dissolved oxygen in acidic mine wastewater and to provide a carbon source for SRB [ 19 , 20 ], creating a suitable environment for SRB growth and thus improving the activity of SRB.…”

Section: Introductionmentioning

confidence: 99%

“…However, the free SRB is susceptible to the acidity of AMD, the toxicity of high concentrations of heavy metal ions, and the inhibition of dissolved oxygen, which reduces the biological activity of SRB to reduce SO 4 2by dissimilation significantly, while the energy required for the growth and metabolism of SRB is provided by an external carbon source, and these problems hinder the promotion of SRB for the treatment of acidic mine drainage [13,14]. For this reason, researchers have introduced microbial immobilization techniques [15,16], where microorganisms are physically and chemically immobilized on specific carriers to enable them to maintain their activity while being resistant to adverse environmental influences, thus improving their ability to remove pollutants [17,18]. Many researchers have tried to prepare composites by organically combining free SRB with loading materials to improve the tolerance of SRB to pH, heavy metal toxicity, and dissolved oxygen in acidic mine wastewater and to provide a carbon source for SRB [19,20], creating a suitable environment for SRB growth and thus improving the activity of SRB.…”

Section: Introductionmentioning

confidence: 99%

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Experimental study on the treatment of AMD by SRB immobilized particles containing “active iron” system

An,

Hu,

Chen

et al. 2023

PLoS ONE

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The inhibition and toxicity of high acidity and heavy metals on sulfate-reducing bacteria in acid mine drainage (AMD) were targeted. Highly active SRB immobilized particles were prepared using SRB, warm sticker wastes (iron powders), corncobs, and Maifan stones as the main matrix materials, employing microbial immobilization technology. The repair ability and reusability of highly active immobilized particles for AMD were explored. The results indicate that the adaptability of immobilized particles to AMD varied under different initial conditions, such as pH, Mn2+, and SO42-. The adsorption process of immobilized particles on Mn2+ follows the quasi-second-order kinetic model, suggesting that it involves both physical and chemical adsorption. The maximum adsorption capacity of immobilized particles for Mn2+ is 3.878 mg/g at a concentration of 2.0 mg/L and pH 6. On the other hand, the reduction process of immobilized particles on SO42- adheres to the first-order reaction kinetics, indicating that the reduction of SO42- is primarily driven by the dissimilation reduction of SRB. The maximum reduction rate of SO42- by immobilized particles is 94.23% at a concentration of 800 mg/L and pH 6. A layered structure with a flocculent appearance formed on the surface of the immobilized particles. The structure’s characteristics were found to be consistent with sulfate green rust (FeII4FeIII2(OH)12SO4·8H2O). The chemisorption, ion exchange, dissimilation reduction, and surface complexation occurring between the matrices in the immobilized particles can enhance the alkalinity of AMD and decrease the concentration of heavy metals and sulfates. These results are expected to offer novel insights and materials for the treatment of AMD using biological immobilization technology, as well as improve our understanding of the mechanisms behind biological and abiotic enhanced synergistic decontamination.

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