Electrochemical method for the removal of arsenate from...

C - Chemistry – Metallurgy – 02 – F

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C02F 1/461 (2006.01) C02F 1/463 (2006.01)

Patent

CA 2557861

The present invention provides an electrochemical method for the removal of arsenate from drinking water, wherein the arsenate is removed by adsorption of metal hydroxide, formed by 'in-situ' anodic oxidation. The electrochemical method, of the present invention, for the removal of arsenate from drinking water, obviates the drawbacks of the commonly used physico-chemical treatments processes such as lime softening, sorption techniques and membrane techniques. The electrochemical method consists of an electrochemical cell fitted with an anode of mild steel or aluminium plate and stainless steel cathode with an inter-electrode distance of 0.5 to 1.5cm. Drinking water containing 0.5 to 3.0 mg/l of arsenate at a pH in the range of 3-10 and at a temperature between 20- 60~C is electrolysed at anode and cathode current densities between 0.05 - 0.2A.dm-2. The iron hydroxide / aluminium hydroxide formed from the anode during electrolysis adsorbs the arsenate present in the water and settles at the bottom. The removal efficiency of this method is up to 98%.

L'invention concerne un procédé électrochimique permettant d'éliminer de l'arséniate contenu dans de l'eau potable, selon lequel l'arséniate est éliminé par adsorption d'hydroxyde de métal, formé par oxydation anodique <= in situ >=. Ledit procédé électrochimique de l'invention, pour éliminer l'arséniate contenu dans de l'eau potable, évite les inconvénients des processus de traitement physico-chimiques utilisés communément, comme l'adoucissement à la chaux, les techniques de sorption et les techniques membranaires. Ledit procédé électrochimique consiste en une cellule électrochimique fixée avec une anode d'une plaque d'acier doux ou d'aluminium et une cathode d'acier inoxydable avec un écart interélectrode de 0,5 à 1,5 cm. De l'eau potable contenant entre 0,5 et 3,0 mg/l d'arséniate à un pH de l'ordre de 3 à 10 et à une température comprise entre 20 et 60 ·C est électrolysée à des densités de courant d'anode et de cathode allant de 0,05 à 0,2 A.dm?2¿. L'hydroxyde de fer/l'hydroxyde d'aluminium formé à partir de l'anode pendant l'électrolyse absorbe l'arséniate présent dans l'eau et se dépose sur le fond. L'efficacité d'élimination de ce procédé va jusqu'à 98 %.

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