Electrolytic purification of contaminated waters by using...

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 1/467 (2006.01) C02F 1/32 (2006.01) C02F 1/461 (2006.01) C25B 11/00 (2006.01) C02F 1/72 (2006.01)

Patent

CA 2160578

The process comprises the oxydation, in an electrolytic cell provided with one or a plurality of anodes, of the pollutants which comtaminate the waters, and is characterized in that oxygen is diffused in the electrolytic cell cathode or cathodes subjected to a voltage lower than 100 V in order to reduce said gas to a dissolution oxydizing species selected among hydrogen peroxide or hydroxyl and/or peroxydril radicals. The equipment for implementing said process comprises an electrolytic cell continuously supplied and provided with an anode (1) and two oxygen diffusion cathode (2) and is sealed on either side with a frame (3), said frames and cathodes delimiting the compartments (4) which are supplied with oxygen gas and/or gas mixtures containing oxygen through inlets (6); similarly, the cathode and the anode delimit the compartments (5) through which circulates the contaminated water entering through the inlet (5) and coming out through outlets (8). The electrolytic cell of the invention provides for the treatment of contaminating waters which contain toxic, non biodegradable substances or substances which cannot be oxydized by conventional processes.

Le procédé consiste en l'oxydation, dans une cellule électrolytique pourvue d'une ou de plusieurs anodes, des contaminants d'eau contaminée, et se caractérise par une diffusion d'oxygène dans la ou les cathodes de ladite cellule électrolytique soumises à un voltage inférieur à 100 V afin de réduire ce gaz à une espèce oxydante en dissolution, espèce choisie parmi le peroxyde d'oxygène ou des radicaux d'hydroxyles et/ou peroxydril. L'équipement permettant de mettre en oeuvre ce procédé comprend une cellule électrolytique alimentée en continu et qui comprend un anode (1) et deux cathodes de diffusion d'oxygène (2) et qui est scellée de chaque côté par un cadre identique (3), les cadres et les cathodes délimitant entre eux les compartiments (4) qui sont alimentés en gaz oxygène et/ou des mélanges gazeux contenant ce gaz oxygène, cette alimentation se faisant à travers des entrées (6), les cathodes et l'anode délimitant les compartiments (5) à travers lesquels circule l'eau contaminée qui entre à travers les entrées (7) et sort par les sorties (8). Ce procédé et cet équipement permettent le traitement d'eaux contaminées qui contiennent des substances toxiques, non bio-dégradables, ou des substances ne pouvant être oxydées par les procédés classiques.

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