Method for clarifying aqueous salt solutions

Details Method for clarifying aqueous salt solutions Method for clarifying aqueous salt solutions

1989-10-24

1991-04-23

Hruskoci, Peter

Liquid purification or separation

Processes

Making an insoluble substance or accreting suspended...

210712, 210714, 423395, B03D 102

Patent

active

050097920

ABSTRACT:
The present invention relates to a method for clarifying aqueous salt solutions containing inorganic insolubles and possibly also organic components. Air is introduced into a recirculating system for the aqueous solution, pressurized and then released, thus forming microbubbles in the solution. Fluocculants are added and the presence of foam forming organic components is ensured. The foam formed is back-mixed into the solution while dissolved air flotation is interrupted, whereupon it may be restarted for flotation of possible remaining contaminants. The foam forming process can be performed in the presence of surfactants, wax and/or oil for forming a stable foam to be back-mixed into the solution for releasing entrapped microbubbles thereto. The method can be carried out by continuously supplying flocculant and solution to the flotation vessel. Dissolved air flotation and back-mixing are then carried out sequentially.

REFERENCES:
patent: 2446655 (1978-08-01), Lawrason
patent: 3179252 (1965-04-01), Vrablik
patent: 3925203 (1975-12-01), Turner
patent: 3966598 (1976-06-01), Ettelt
patent: 4161444 (1979-07-01), Moore
patent: 4203837 (1980-05-01), Hoge et al.
patent: 4492636 (1985-01-01), Burke
patent: 4790944 (1988-12-01), Gordon et al.

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