Self-cleansing filter

Details Self-cleansing filter Self-cleansing filter

C - Chemistry, Metallurgy

02

F

C02F 3/32 (2006.01) C02F 3/04 (2006.01)

Patent

CA 2217480

A self-cleaning filter for aqueous media such as sewage effluent and the like which comprises a ventilated bed of discrete filtration material such as silica particulates, finely ground or shredded non-oil plastics materials, clay particulates, ground zeolite, diatomaceous earth, powdered activated carbon, short fibre carbon and fine crushed charcoal, in which is dispersed a population of living organisms such as worms, insects, mothfly larvae, collembola, crustaceans and mites, which organisms have the ability to maintain at least a surface layer of the bed in an open and aerobic state. Preferably the bed is covered with an air and water permeable cover which excludes a large percentage of the incident light.

Filtre autonettoyant pour milieux aqueux tels que des eaux d'égout et analogues, qui comporte un lit ventilé de matériau de filtration discret tel que de la silice particulaire, des matériaux plastique finement broyés ou déchiquetés non huileux, de l'argile particulaire, de la zéolite broyée, de la terre à diatomées, du charbon actif en poudre, des fibres de carbone courtes et du charbon de bois finement écrasé, dans lequel est dispersée une population d'organismes vivants tels que des vers, des insectes, des larves de teignes, des collemboles, des crustacés et des acariens, lesdits organismes ayant la capacité de maintenir au moins une couche de surface du lit dans un état ouvert et aérobie. De préférence, le lit est recouvert d'un couvercle perméable à l'air et à l'eau, ce qui exclut un pourcentage important de lumière incidente.

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