Bioleaching of trace metals from coal ash using local isolate from coal ash ponds

Pangayao, Denvert; Gallardo, Susan; Promentilla, Michael Angelo B.; Hullebusch, Eric D. van

doi:10.1051/matecconf/201815603031

Cited by 5 publications

(4 citation statements)

References 33 publications

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“…Therefore, most elements are encapsulated inside the core of the CFA. In light of this, using smaller particles in biometallurgical processes related to CFA is desirable [85,105].…”

Section: Grinding and Sievingmentioning

confidence: 99%

Harnessing the Capabilities of Microorganisms for the Valorisation of Coal Fly Ash Waste through Biometallurgy

Kanesalingam,

Fernando,

Panda

et al. 2023

Minerals

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Coal fly ash (CFA) is a highly versatile raw material that has the potential to yield multiple value-added products, including cenospheres, zeolites, carbon nanotubes, and fertiliser substrates. Despite its versatility, a majority of these components are often overlooked, and CFA is primarily used for construction. Conventional processing methods of CFA are known to pose significant environmental challenges, including the leaching of hazardous materials, emission of toxic gases, and the high energy consumption needed to extract the value-added components. Herein, we explore the potential of biometallurgical approaches as an eco-friendly alternative to conventional processing methods for the comprehensive utilisation of CFA. Our focus is on the application of different microorganisms to CFA, the domestication of microorganisms, preprocessing of CFA to facilitate effective biometallurgical processes, the use of bioreactors, and synthesis of nano silica particles. We also propose a novel method for extracting the value-added components from CFA using a preprocessing technique (i.e., washing cycle), combined with multiple interactions with biometallurgical processes. Adopting this approach, we not only enhance environmental stewardship but also improve the circular economic aspects of multi-component utilisation, while providing valuable insights for the development of sustainable techniques for utilising CFA.

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“…Therefore, most elements are encapsulated inside the core of the CFA. In light of this, using smaller particles in biometallurgical processes related to CFA is desirable [85,105].…”

Section: Grinding and Sievingmentioning

confidence: 99%

Harnessing the Capabilities of Microorganisms for the Valorisation of Coal Fly Ash Waste through Biometallurgy

Kanesalingam,

Fernando,

Panda

et al. 2023

Minerals

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“…From the previous study [20], the optimum parameter obtained were 1% pulp density, speed of 90 rpm at 37°C and 5 mL initial inoculum. After 30 days of bioleaching, the maximum trace metal extracted were 13.77% Cr, 14.61% Cu, 6.33% Mn and 12.18% Mn.…”

Section: Bioleaching Kinetics: Shrinking Core Modelmentioning

confidence: 99%

“…The focus of this study is to investigate the rate controlling mechanism using Shrinking Core Model of trace metal extraction from coal ash using Pseudomonas spp. Based on the previous study [20], optimum conditions were used in the bioleaching process to obtain maximum extraction of trace metals.…”

Section: Introductionmentioning

confidence: 99%

Bioleaching kinetics of trace metals from coal ash using Pseudomonas spp.

et al. 2019

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The kinetics of bioleaching of chromium, copper, manganese and zinc from coal ash using Pseudomonas spp. isolated from coal ash pond was investigated. From the previous study, parameters used for bioleaching were 1% pulp density, 90 rpm, 37°C and 5 ml inoculum was placed in a 100 ml fresh medium with the ash. These conditions were used for bioleaching of coal ash for 30 days. Moreover, the initial pH of the solution is 8.20 and decreases to 8.61. After 30 days of bioleaching, the maximum metal leached were 13.77% Cr, 14.61% Cu, 6.33% Mn and 12.18% Zn. Assuming that the coal ash will shrink uniformly with respect to time using Shrinking Core Model, the kinetic data showed linear plot for percent metal leached versus time, suggested that diffusion through ash layer control was the rate controlling mechanism.

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“…citric, oxalic and maleic acids) produced by fungi/bacteria have the inherent capacity to leach out metals from resources by forming soluble metal–organic ligand complexes. Only a few studies have reported on the use of acidolysis by sulfuric acid produced by bacteria such as Acidithiobacillus thiooxidans or A. caldus . A maximum of 88% of Cu from low grade Cu‐oxide ores was extracted using the biogenic sulfuric acid produced by A. thiooxidans .…”

Section: Introductionmentioning

confidence: 99%

Bioleaching and selective biorecovery of zinc from zinc metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

Sethurajan

Lens

Rene

et al. 2016

J. Chem. Technol. Biotechnol

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BACKGROUND Gradual depletion of high‐grade ores for heavy metals has encouraged industries to search for alternative methods to recover metals. Wastes generated from metallurgical industries can be used as a secondary resource as it contains high concentrations of metals. RESULTS The bioleaching kinetics and biorecovery of zinc from Zn‐plant leach residues (ZLR), collected from a currently operating Zn‐plant in Três Marias (Minas Gerais, Brazil) were investigated using sulfuric acid producing Acidithiobacillus thiooxidans (A. thiooxidans). Response surface methodology (RSM) with full factorial central composite design (CCD) was applied to optimize Zn bioleaching by A. thiooxidans. The experiments were performed by varying the initial elemental sulfur concentration (5–30 g L−1), pulp density (5–50 g L−1) and initial pH (3.0–4.0 pH units). More than 75% of Zn was extracted from ZLR by A. thiooxidans under optimized conditions (sulfur concentration 25.1 g L−1, pulp density 21.5 g L−1 and initial pH 3.3). The leaching efficiencies of culture supernatant (biogenic sulfuric acid) and chemical sulfuric acid were compared to understand the leaching kinetics. The Zn leaching kinetics of ZLR followed the shrinking core diffusion model. Zn was selectively recovered from the Fe‐rich acidic bioleachate by biogenic sulfide precipitation. Fe was first removed (more than 85% of total Fe in the leachate) by adjusting the initial pH to 5.0, followed by selective Zn biorecovery. CONCLUSIONS Zn (>95%) was selectively recovered from Fe‐depleted ZLR by biogenic sulfides (with 1:1, Zn:biogenic sulfide mass ratio). Biohydrometallurgy can be a potential alternative resource recovery strategy for the selective recovery of Zn from ZLR. © 2016 Society of Chemical Industry

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Bioleaching of trace metals from coal ash using local isolate from coal ash ponds

Cited by 5 publications

References 33 publications

Harnessing the Capabilities of Microorganisms for the Valorisation of Coal Fly Ash Waste through Biometallurgy

Harnessing the Capabilities of Microorganisms for the Valorisation of Coal Fly Ash Waste through Biometallurgy

Bioleaching kinetics of trace metals from coal ash using Pseudomonas spp.

Bioleaching and selective biorecovery of zinc from zinc metallurgical leach residues from the Três Marias zinc plant (Minas Gerais, Brazil)

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