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Related Concept Videos

Acid Mine Drainage01:19

Acid Mine Drainage

Mining activities that disturb sulfide-rich rocks, particularly those containing pyrite (FeSâ‚‚), 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...
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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...
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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...
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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...
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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:

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Current approaches for mitigating acid mine drainage.

Prafulla Kumar Sahoo1, Kangjoo Kim, Sk Md Equeenuddin

  • 1Department of Environmental Engineering, Kunsan National University, Jeonbuk, Republic of Korea. prafulla.iitkgp@gmail.com

Reviews of Environmental Contamination and Toxicology
|April 30, 2013
PubMed
Summary
This summary is machine-generated.

Preventing acid mine drainage (AMD) involves limiting sulfide oxidation through various methods. While no single technique is perfect, combining approaches like physical barriers with chemical passivation shows promise for effective AMD mitigation.

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Area of Science:

  • Environmental Science
  • Geochemistry
  • Mining Engineering

Background:

  • Acid mine drainage (AMD) is a significant environmental issue caused by the oxidation of metal sulfides in mine waste.
  • AMD leads to water acidification and metal contamination, impacting surface and groundwater bodies.

Purpose of the Study:

  • To review and categorize major methods for limiting sulfide oxidation and preventing AMD.
  • To analyze the effectiveness, cost, and environmental impact of each method.
  • To guide researchers and engineers in selecting appropriate AMD mitigation strategies.

Main Methods:

  • Physical barriers (wet/dry covers)
  • Bacterial inhibition (bactericides)
  • Chemical passivation (inorganic/organic coatings)
  • Electrochemical cover technology
  • Desulfurization

Main Results:

  • Physical barriers offer short-term effectiveness; wet covers require high maintenance, and dry covers with plastic liners are costly.
  • Bactericides are short-lived and potentially toxic.
  • Silica passivation is promising due to stability and acid resistance.
  • Organic coatings are effective at low pH but can be expensive and fail in field conditions.
  • Desulfurization offers a simple, economic solution for large-scale waste management.

Conclusions:

  • No single AMD mitigation method is fully mature; combining techniques can enhance effectiveness.
  • Further research is needed on silica passivation field viability, permanganate passivation mechanisms, and the long-term effects of organic reagents.
  • Comprehensive characterization of waste materials is crucial for selecting optimal prevention measures.