Water treatment method

Details Water treatment method Water treatment method

C - Chemistry, Metallurgy

02

F

C02F 1/66 (2006.01) C02F 1/52 (2006.01) C02F 1/64 (2006.01) C02F 1/72 (2006.01)

Patent

CA 2418472

The invention provides a method treating acid raw water including the step of neutralising the water by adding calcium carbonate to it in a neutralising stage. The neutralised water is then rendered alkaline or more alkaline by adding an alkali thereto selected from calcium hydroxide, calcium oxide and mixtures thereof in a lime treatment stage. The alkaline water is then treated with carbon dioxide in a carbon dioxide treatment stage, with the carbon dioxide reacting in the carbon dioxide treatment stage with calcium hydroxide dissolved in the water.

L'invention concerne un procédé de traitement de l'eau brute acide consistant notamment à neutraliser l'eau par adjonction de carbonate de calcium dans une phase de neutralisation. L'eau neutralisée est ensuite rendue alcaline ou plus alcaline par adjonction d'un alcali, sélectionné parmi l'hydroxyde de calcium, l'oxyde de calcium et des mélanges de ceux-ci, dans une phase de traitement à la chaux. L'eau alcaline est ensuite traitée au moyen de gaz carbonique dans une phase de traitement au gaz carbonique, le gaz carbonique réagissant dans la phase de traitement au gaz carbonique avec de l'hydroxyde de calcium dissous dans l'eau.

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