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Related Concept Videos

Microbial Leaching01:27

Microbial Leaching

Microbial leaching, also known as bioleaching, is an environmentally favorable method for extracting metals from low-grade ores using specific microorganisms. This biotechnological approach is particularly valuable for mining operations targeting copper, gold, and uranium, where traditional extraction methods may be economically or environmentally impractical.Copper Leaching and Microbial CatalysisIn copper bioleaching, crushed ore is arranged into heaps and irrigated with a dilute sulfuric...
Microbes and Other Elemental Cycles01:24

Microbes and Other Elemental Cycles

Microbial activity plays a pivotal role in the biogeochemical cycling of iron and manganese, especially at the redox gradients characteristic of stratified aquatic environments. These cycles are driven by microbial transformations between oxidized and reduced forms of the metals, allowing organisms to exploit them for metabolic energy and structural purposes.Iron Cycling Across Redox GradientsIn neutral, oxygen-rich surface waters, iron is predominantly found in its oxidized, insoluble ferric...
Microbial Corrosion01:24

Microbial Corrosion

Microbiologically Influenced Corrosion (MIC) is a significant form of material degradation caused by the metabolic activities of microorganisms. This phenomenon poses substantial challenges across various industries, including oil and gas, maritime, and water treatment sectors.MIC occurs when microorganisms, such as bacteria, archaea, and fungi, colonize metal surfaces, forming biofilms that alter the local electrochemical environment. These biofilms can lead to the production of corrosive...
Acid Mine Drainage01:19

Acid Mine Drainage

Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeS₂), initiate a cascade of geochemical and microbiological processes with serious environmental implications. When exposed to air and water, pyrite undergoes oxidation, releasing sulfate, ultimately forming sulfuric acid and mobilizing heavy metals into surrounding water systems. This phenomenon, known as acid mine drainage (AMD), results in low pH waters laden with toxic elements that threaten aquatic...
Microbial Bioremediation of Uranium01:25

Microbial Bioremediation of Uranium

Microorganisms play a critical role in the transformation and immobilization of uranium in contaminated environments through four main pathways: bioreduction, biosorption, bioaccumulation, and biomineralization. These mechanisms reduce uranium’s toxicity and prevent its migration through groundwater systems, offering sustainable approaches for in situ bioremediation.Bioreduction of UraniumBioreduction is driven by anaerobic bacteria such as certain strains of Geobacter and Shewanella, which use...
Extraction: Advanced Methods00:56

Extraction: Advanced Methods

Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is formed in...

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Related Experiment Video

Updated: Jul 7, 2026

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
05:35

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

Microbe-induced changes in metal extractability from fly ash.

Sadhna Tiwari1, Babita Kumari, S N Singh

  • 1Environmental Science Division, National Botanical Research Institute, Lucknow 226 001, India. sadhnamicro@yahoo.co.in <sadhnamicro@yahoo.co.in>

Chemosphere
|February 12, 2008
PubMed
Summary

Bioremediation using bacteria offers a low-cost, eco-friendly solution for toxic metals in fly ash. These bacteria can either mobilize metals for plant uptake or immobilize them to prevent water contamination.

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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
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Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Published on: February 21, 2017

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Last Updated: Jul 7, 2026

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography
05:35

Quantification of Metal Leaching in Immobilized Metal Affinity Chromatography

Published on: January 17, 2020

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent
11:14

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Published on: February 21, 2017

Area of Science:

  • Environmental Science
  • Microbiology
  • Bioremediation

Background:

  • Fly ash dumps pose environmental risks due to toxic metal contamination of water resources.
  • Phytoextraction is a potential method for removing metals, but requires efficient metal bioavailability.
  • Microbial augmentation is explored as a sustainable approach for managing fly ash pollutants.

Purpose of the Study:

  • To investigate a low-cost, eco-friendly bioremediation technology for toxic metals in fly ash.
  • To assess the impact of fly ash-tolerant bacteria on metal extractability and mobility.
  • To explore the potential of bacteria in assisting phytoremediation of contaminated sites.

Main Methods:

  • Isolation of heavy metal-tolerant bacterial strains from Typha latifolia on fly ash dumps.
  • Studying the effect of bacterial augmentation on metal bioavailability and immobilization in fly ash.
  • Analyzing specific metal responses (Fe, Zn, Ni, Pb, Cr, Cu, Cd) to different bacterial strains.

Main Results:

  • Bacterial strains exhibited varied effects, inducing bioavailability of Fe, Zn, and Ni, while immobilizing Pb, Cr, Cu, and Cd.
  • Specific bacterial strains demonstrated strain-specific metal solubilization and immobilization capabilities.
  • Eight bacterial strains were found to enhance Nickel (Ni) mobility, while others immobilized it.

Conclusions:

  • Bacteria play a dual role in fly ash bioremediation: enhancing metal bioavailability for phytoextraction and immobilizing metals to prevent water contamination.
  • Microbe-assisted phytoremediation is a promising strategy for contaminated site remediation.
  • Bacterial augmentation offers a sustainable and effective method for managing toxic metals in fly ash, reducing ecological and human health risks.