Fly ash

Information about fly ash and its health implications

Fly ash is a byproduct from the combustion of coal in electric power plants. It is a fine, powdery substance that is carried out of the boiler with the flue gases. Fly ash is captured by pollution control devices such as electrostatic precipitators or baghouses before the flue gases reach the chimney.

Composition and Properties

Fly ash consists primarily of silica, alumina, and iron oxide. It also contains small amounts of other oxides such as calcium oxide and magnesium oxide. The specific composition of fly ash depends on the type of coal that is burned.

Uses

Fly ash is used in a variety of applications, including as a pozzolan in concrete production, which improves the strength and durability of the concrete. It is also used in the manufacture of cement, as a filler in asphalt, and in the production of bricks and other building materials.

Health Implications

Exposure to fly ash can pose health risks due to the presence of toxic substances such as arsenic, lead, and mercury. Inhalation of fly ash particles can lead to respiratory problems and other health issues. It is important to handle fly ash with appropriate safety measures to minimize exposure.

Environmental Impact

The disposal of fly ash can have significant environmental impacts. Improper disposal can lead to soil and water contamination. However, the use of fly ash in construction materials can help reduce the environmental footprint by recycling this byproduct.

Regulations

The management and disposal of fly ash are regulated by various environmental agencies to ensure that it does not pose a threat to public health or the environment.

See Also

• Coal combustion products
• Environmental impact of coal
• Air pollution

External Links

• United States Environmental Protection Agency - Coal Ash
• Occupational Safety and Health Administration - Coal Ash