Sedimentation is one of the processes that is taking place during filtration, the other two being straining and adsorption. Fine particulate matter settles on the upward-facing surfaces of the sand grains. The process of sedimentation can remove finer particles of pollution than straining. As the amount of sediment increases, the amount of space in between sand grains (pores) decreases. This will cause the velocity of water through the filter to increase. Further sedimentation can then no longer occur and, due to the higher velocity, some sediment could get pushed further down into the filter bed.
In : Coagulation & Filtration
Tags:
"sedimentation" "velocity"
