Why is particle size distribution a critical factor in fly ash disposal for landfilling?

Particle size distribution is a critical factor in fly ash disposal for landfilling because it significantly affects the ash's physical properties, including its permeability, compaction characteristics, and potential for leaching. Fly ash consists of fine particles collected from flue gases during combustion. Permeability refers to how easily liquids can pass through a material; a high permeability allows water to flow through the ash more readily. Ash with a wide range of particle sizes, meaning a mixture of both fine and coarse partic....