Title: Filtration

Gravity filtration

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The water circulates vertically and downward through the filter by simple gravity. Within this type, we can speak of two ways of operating, which leads us to have a slow filtration, barely currently used, or a fast filtration. The mechanism of solids separation is a combination of settlement, retention, adhesion, and attraction, thus removing particles much smaller than the interstitial space. It is a system widely used in drinking water treatment.

Pressure filtration

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They are normally contained in containers and the water is forced through the filter media under pressure. Also, in this case there may be slow filtration, in which a filter cake develops on the surface of the filter where the filtration, through that surface, is by physical and biological mechanisms. On the other hand, in rapid filtration we speak of depth filtration, that is, when most of the thickness of the filter medium is active for the filtration process and the quality of the filtration improves with depth. This pressure filtration is most often used in industrial waters.