Method for treating wastewater or produced water

C - Chemistry – Metallurgy – 02 – F

Patent

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Details

C02F 9/04 (2006.01) B01D 61/00 (2006.01) C02F 1/00 (2006.01) C02F 1/44 (2006.01) C02F 1/52 (2006.01) C02F 5/00 (2006.01) C02F 9/02 (2006.01)

Patent

CA 2671928

A method or process for treating wastewater containing high organics, silica, boron, hardness, and suspended and dissolved solids. The method includes degasifying the wastewater for the removal of dissolved gases and thereafter chemically softening the wastewater. After the chemical softening step, the wastewater is directed through a media filter or membrane which removes additional solids and precipitants. Thereafter the wastewater is directed through a sodium ion exchange that further softens the wastewater. The effluent from the ion exchange is directed through a cartridge filter and the effluent from the cartridge filter is directed through one or more reverse osmosis units. At a selected phase of the process, prior to the wastewater reaching the reverse osmosis unit or units, the pH of the wastewater is raised and maintained such that the pH of the wastewater reaching a reverse osmosis unit is at a pH greater than 10.5.

L'invention concerne un procédé de traitement des eaux usées contenant des éléments organiques élevés, de la silice, du bore, une dureté et des solides mis en suspension et dissous. Le procédé comprend le dégazage des eaux usées pour l'élimination de gaz dissous et par la suite l'adoucissement chimique des eaux usées. Après l'étape d'adoucissement chimique, les eaux usées sont dirigées à travers un filtre de milieu ou une membrane qui élimine les solides et précipitants supplémentaires. Par la suite, les eaux usées sont dirigées à travers un échange d'ions sodium qui adoucit également les eaux usées. L'effluent de l'échange d'ions est dirigé à travers un filtre à cartouche et l'effluent du filtre à cartouche est dirigé à travers une unité d'osmose inverse ou plus. Dans une phase choisie du procédé, avant que les eaux usées n'atteignent l'unité ou les unités d'osmose inverse, le pH des eaux usées est élevé et maintenu de sorte que le pH des eaux usées atteignant une unité d'osmose inverse soit à un pH supérieur à 10,5.

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