What is pond ash?

Pond ash refers to the solid waste generated during coal combustion in thermal power plants. It consists of the non-combustible mineral matter present in the coal that accumulate at the bottom of ash ponds or settling basins. When coal undergoes combustion, the majority of its organic components are burned off, leaving behind a mixture of inorganic materials. These materials include mineral particles such as silica, alumina, iron oxides, and other trace elements.

Pond ash is a complex mixture, and its composition can vary depending on the source and type of coal used, as well as the combustion conditions. Generally, pond ash has a high concentration of fine particles, which contributes to its powdery consistency. It is typically grey or brown in color and can range in texture from fine silt to coarse sand.

Due to its high mineral content, pond ash is often considered a potential resource as a substitute for traditional construction materials. However, its use must be carefully managed and regulated due to the potential presence of harmful substances and the need to minimize environmental impacts.