What type of filtration is often used after sedimentation?

Granular media filtration is commonly utilized following the sedimentation process in water treatment because it effectively removes remaining suspended particles and provides a higher level of clarity in the water. After sedimentation, where larger particles settle out of the water, some smaller particles may still be present. Granular media filters, which can consist of layers of sand, gravel, and sometimes other materials, are designed to trap these finer particulates.

This type of filtration works through the physical mechanisms of straining, sedimentation, and adsorption, enabling it to improve the overall quality of the water. It is particularly efficient in removing turbidity and can also help in the removal of microorganisms, enhancing the safety of the treated water.

While other filtration options, such as strainer and membrane filtration, also serve specific roles in water treatment, granular media filtration is fundamentally suited to follow sedimentation due to its ability to handle larger volumes of water and its proven effectiveness in the context of conventional water treatment processes. Sand filtration, while similar to granular media filtration, can be considered a specific type within this broader category.