Method of laundering items and purifying waste water therefrom

Details Method of laundering items and purifying waste water therefrom Method of laundering items and purifying waste water therefrom

C - Chemistry, Metallurgy

11

D

C11D 3/04 (2006.01) C02F 1/52 (2006.01) C11D 3/12 (2006.01) C11D 11/00 (2006.01)

Patent

CA 2231462

A method of laundering oily items comprises laundering said items in a wash solution which includes a surfactant system and a source of alkalinity. The source of alkalinity is an alkali metal aluminate preferably sodium aluminate at a concentration effective to have at least about 25 ppm of the alkali aluminate present in the wash solution measured as alumina. The wash solution is then separated from the laundered items and its pH reduced to about 9 or less. A destabilizing polymer such as diallyldimethyl ammonium chloride can be added. This combination causes the oil and grease to separate from the wash solution and float to the surface along with the sodium aluminate. If the concentration of the sodium aluminate is above about 100 ppm preferably about 250 ppm, there is no need to add the destabilizing polymer. This does not affect the overall efficiency of the detergent, yet significantly improves the ability to separate the oil and grease from the waste wash solution.

Procédé de blanchissage d'articles graisseux consistant à blanchir ces articles dans une solution de lavage contenant un système tensioactif et une source d'alcanilité. La source d'alcanilité est un aluminate de métal alcalin, de préférence un aluminate de sodium, en concentration efficace, exprimée en alumine, pour qu'au moins environ 25 ppm d'aluminate alcalin soit présent dans la solution de lavage. La solution de lavage est ensuite séparée des articles blanchis et son pH est réduit à environ 9 ou moins. Un polymère déstabilisant tel qu'un chlorure d'ammonium diallyldiméthyle peut être ajouté. Cette combinaison provoque la séparation de l'huile et de la graisse de la solution de lavage et leur flottement à la surface conjointement avec l'aluminate de sodium. Si la concentration d'aluminate de sodium est supérieure à environ 100 ppm, de préférence à environ 250 ppm, il n'est pas nécessaire d'ajouter le polymère déstabilisant, ce qui ne nuit en général pas à l'efficacité du détergent, mais améliore considérablement l'aptitude de l'eau et de la graisse à se séparer de la solution de lavage.

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