Liquid purification or separation – Processes – Making an insoluble substance or accreting suspended...
Patent
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.
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Millaway Robert M.
Nilsson Arild
Pettersen Jarl M.
Hruskoci Peter
Norsk Hydro a.s.
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