Liquid purification or separation – Processes – Treatment by living organism
Patent
1984-12-19
1986-11-25
Wyse, Tom
Liquid purification or separation
Processes
Treatment by living organism
210624, 210625, C02F 312
Patent
active
046247882
ABSTRACT:
A method of biological purification of waste water by removing organic contaminants therefrom by activated sludge in two purification stages is proposed. The primary stage involves mixing waste water with activated sludge, aerating the mixture and separating recyclable sludge and sludge water. The recyclable sludge is regenerated and fed for mixing with waste water. At the secondary stage the sludge water of the primary purification stage is aerated and residual activated sludge is removed therefrom. The recyclable sludge delivered for regeneration is divided into two flows one of which is fed directly for regeneration, whereas the other is compacted prior to regeneration to be mixed with the first for joint regeneration. An invariable ratio between the amount of organic contaminants carried by incoming waste water and activated sludge is continuously maintained at the first purification stage. An aeration tank for carrying out the proposed method comprises mixing vessels of the primary and secondary stages. The primary stage includes connected in sequence vessel, sludge separator, and a regeneration chamber connected to the vessel inlet. There is also provided a sludge compactor communicated by an inlet with the sludge separator and by outlets with the regeneration chamber and mixing vessel of the secondary purification stage.
REFERENCES:
patent: 2457057 (1948-12-01), Mallory
patent: 3386910 (1968-06-01), Forrest
patent: 4183808 (1980-01-01), Drnevich
patent: 4442005 (1984-04-01), Breider
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