Cooling tower water treatment system

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 1/70 (2006.01) C02F 1/46 (2006.01) C02F 1/48 (2006.01) C02F 1/72 (2006.01) F28F 19/00 (2006.01)

Patent

CA 2220196

A cooling tower water treatment system removes contaminants include chlorine, calcium carbonate as calcite, and microorganisms from water in the system with redox media in a fluidized bed. The treatment system includes a treatment bed, in the form of a column, having a reaction chamber of a first diameter and a retention chamber of a second diameter, the second diameter being greater than the first diameter. Redox media, in the reaction chamber, is fluidized by water flowing in a direction countercurrent to gravity and is held in place, without the use of screens of filters, by a reduction in a flow rate of the fluidizing media resulting from the larger diameter of the retention chamber. Preferably, the treatment system includes a physical filtration unit, such as an automatic backwashing sand filter, to prevent entry of particulates and scale into the reaction chamber.

Un système de traitement, constitué d'un milieu rédox dans un lit fluidisé, permet d'éliminer le chlore, le carbonate de calcium, comme la calcite, et les microorganismes dans l'eau d'une tour de refroidissement. Le système comprend un lit de traitement, sous forme de colonne, possédant une cuve de réaction avec un premier diamètre et une cuve de retenue avec un second diamètre, plus grand que le premier. Le milieu rédox dans la cuve de réaction est fluidisé par écoulement d'eau dans une direction à contre-courant de la gravité, et il est maintenu en place, sans utilisation de cribles filtrants, par réduction du débit du milieu fluidifiant, qui résulte du diamètre plus grand de la cuve de retenue. Le système de traitement inclut de préférence une unité de filtration physique, comme un filtre à sable à lavage à contre-courant automatisé, pour empêcher l'entrée de particules et de tartre dans la cuve de réaction.

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