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How can coal mining contaminate groundwater?
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coal utilization
Cross-regenerative coke oven. (A) Cross section, showing the alternating arrangement of flue walls and ovens; (B) longitudinal section, showing (left) a series of combustion flues in a single flue wall and (right) part of a long, slotlike oven.
Coal mining and associated activities can contaminate groundwater through several processes that degrade water quality and threaten public health.12
- Leaching of Toxic Elements: When coal mining exposes coal and adjacent rock to the atmosphere, these materials weather rapidly. This process releases potentially toxic elements and soluble chemical productsâsuch as sulfuric acid and iron sulfatesâwhich can leach into and contaminate nearby groundwater supplies.1
- Acid Mine Drainage: The formation of acid mine drainage, characterized by the release of acidic and metal-rich water, significantly impacts the surrounding environment, often reducing local biodiversity and polluting water sources.1
- Hydraulic Fracturing: The process of fracking, used to extract methane from coal beds, involves the high-pressure injection of fluids underground. This technology has been directly associated with the contamination of groundwater resources.1
- Waste Management: Improper disposal of coal and rock waste, as well as the legacy of abandoned mine sites, contributes to ongoing water pollution and environmental degradation.12