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

1995-07-20

1996-06-25

McCarthy, Neil

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210708, 210724, 210735, 210736, 210730, 34359, 34519, B01D 1705

Patent

active

055296963

ABSTRACT:
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.

REFERENCES:
patent: 3609088 (1971-09-01), Sumner
patent: 3625902 (1971-12-01), Sumner
patent: 3865754 (1975-02-01), Norris et al.
patent: 3956117 (1976-05-01), Bradley et al.
patent: 4059515 (1977-11-01), Fowler et al.
patent: 4083793 (1978-04-01), Jakobi et al.
patent: 4248729 (1981-02-01), Rubingh et al.
patent: 4264465 (1981-04-01), Abel
patent: 4826618 (1989-05-01), Borseth et al.

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