Method and apparatus for clarifying liquid using a pulsating...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/52 (2006.01) B01D 21/00 (2006.01)

Patent

CA 2061416

There is disclosed a pulsating sludge bed clarifier especially for the treatment of low turbidity waters, which uses incline plates in the sludge bed and some recirculated sludge. The clarification is greatly enhanced by recirculating a relatively small part of the sludge concentrate to a reactor chamber used for the premixing of water to be treated and the coagulant. The small amount of recirculated sludge cuts down significantly on the polymer flocculant, which is the most expensive chemical in the process that is required to be used, and can also serve to improve the adsorption of colors and similar materials, increase the density of the sludge blanket, and improve the rate of throughput of the system.

La divulgation concerne un clarificateur vibratoire à lit de boues, conçu spécialement pour le traitement d'eaux de faible turbidité, qui utilise des plateaux inclinés dans le lit de boues et fait recirculer une certaine quantité de boues. La clarification est nettement améliorée par la recirculation d'une partie relativement faible du concentré de boues vers une chambre de réacteur, utilisée pour le prémélangeage de l'eau à traiter et du coagulant. La petite quantité de boue recirculée réduit de façon significative le montant de floculant polymérique, soit le produit chimique le plus coûteux qu'il faut utiliser dans le procédé, produit qui sert également à améliorer l'adsorption des couleurs et de matières semblables, à augmenter la densité du lit de boues, et enfin à améliorer la capacité du système.

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