Arrangement for air purification and method

A - Human Necessities – 61 – L

Patent

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A61L 9/01 (2006.01)

Patent

CA 2270912

A method and arrangement for conducting air filtration by biofilter operation. The arrangement generally includes at least one bioreactor bed (40) through which air to be purified is passed through inlet (72). The bed (40) is divided into lower stratified region (117) and upper stratified region (118). The lower region (117) has porous screen (122), strata of volcanic rock (124), strata of wood or bark chips mixed with soil (125) and strata containing a bacteria-loaded mixture of peat, topsoil, vermiculite and some bark (126). The upper region (118) also comprises porous screen (129), strata of volcanic rock (130), strata of wood or bark chips mixed with soil (131) and strata of topsoil, vermiculite, bark and peat (132). The arrangement is configured to draw downwardly and the operation is conducted under pressure of less than ambient.

Procédé et arrangement permettant de filtrer l'air au moyen d'un filtre biologique. L'arrangement comprend de manière générale au moins un lit (40) de bioréacteur, dans lequel l'air à purifier est introduit par un orifice d'entrée (72). Le lit (40) est divisé en une zone stratifiée inférieure (117) et une zone stratifiée supérieure (118). La zone inférieure (117) comporte un tamis poreux (122), des strates de roche volcanique (124), des strates de copeaux de bois ou d'écorce mélangés à de la terre (125), et des strates contenant un mélange riche en bactéries, constitué de tourbe, de terre végétale, de vermiculite et d'un peu d'écorce (126). La zone supérieure (118) comprend également un tamis poreux (129), des strates de roche volcanique (130), des strates de copeaux de bois ou d'écorce mélangés à de la terre (131), et des strates de terre végétale, de vermiculite, d'écorce et de tourbe (132). L'arrangement est configuré de façon à aspirer vers le bas, et l'opération se fait sous une pression inférieure à la pression ambiante.

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