Method and apparatus for the purification of water...

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 9/00 (2006.01) C02F 1/00 (2006.01) C02F 1/44 (2006.01) C02F 1/52 (2006.01)

Patent

CA 2676659

The invention relates to a device and a process for purifying water (H) which is contaminated with sulphate ions and heavy metal ions, wherein the water (H) is collected (20) in a water reservoir (W) and a substance (B) having basic activity in water (H) is fed (21) to the water reservoir (W) in such a manner that a precipitant having heavy metal ions is precipitated from the water (H), wherein at least a subquantity of water is taken off (22) from the water reservoir and is separated (24) into pure water (R) which is substantially freed from sulphate ions and heavy metal ions and dirty water (S) which is enriched with sulphate ions and heavy metal ions, and wherein the dirty water (S) is at least in part recirculated (25) to the water reservoir (W), as a result of which a concentration of sulphate ions in the water reservoir is achieved such that a precipitant having sulphate ions is precipitated from the water. This invention permits a technically simple and inexpensive purification of water which is contaminated with sulphate ions and heavy metal ions.

La présente invention concerne un dispositif et un procédé de purification d'eau (H) contenant des impuretés sous forme d'ions sulfate et d'ions de métal lourd. Selon l'invention : l'eau (H) est recueillie (20) dans un réservoir à eau (W) et une substance (B) à action basique dans l'eau (H) alimente (21) le réservoir à eau (W) de sorte qu'une substance de remplissage présentant des ions de métal lourd est extraite de l'eau (H), au moins une quantité partielle d'eau étant prélevée (22) du réservoir à eau et séparée (24) en eau pure (R) sensiblement dépourvue d'ions sulfate et d'ions de métal lourd et en eau sale (S) enrichie en ions sulfate et ions de métal lourd; et l'eau sale (S) est au moins partiellement réintroduite (25) dans le réservoir à eau (W), ce qui permet l'obtention d'une concentration en ions sulfate dans le réservoir d'eau telle qu'une substance de remplissage présentant des ions sulfate est extraite de l'eau. L'invention permet une purification techniquement plus simple et moins onéreuse de l'eau contenant des impuretés sous forme d'ions sulfate et d'ions de métal lourd.

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