Deep bed filter

Liquid purification or separation – Particulate material type separator – e.g. – ion exchange or... – With rehabilitation means

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Details

210290, 210506, B01D 2310

Patent

active

041972058

ABSTRACT:
A filter for filtering contaminants from liquid, wherein the apparatus includes several distinct, adjacent layers of granular filter medium. The layers are carefully graded for size and density, with the granules constituting the layers increasing in density and decreasing in size in the direction of filter flow. At least some of the layers are composed of essentially uniformly sized and shaped, water-wettable synthetic granules of a specific gravity ranging from about 1.04 to about 1.5. For some applications, all of the bed layers are formed of such synthetic granules; for other applications, some of the layers, preferably the lower layers, are formed of naturally occurring materials, such as anthracite, sand, and fruit pit shells or nut shells. In either form of the invention, the distribution of density and size in the direction of flow--normally downwardly--is such that the layers readily stratify after backwashing to reconstitute the bed in its initial, most efficient filtration configuration. In the operation of the device, staged filtration is achieved with larger contaminants accumulating in the upper filtration layer and smaller contaminants progressively accumulating in the subsequent layers. After backwashing by reverse liquid flow, the layers are reformed substantially in place without substantial intermixing between the layers as a result of the graded granule sizes and specific gravities.

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