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US 4,231,862 AGranted
Method for the preservation of an activated sludge
AssigneeSulzer Brothers Limited
InventorsRoberto Mona, Jurgen Gnieser
Life of this patent
Estimating the term…
Abstract
A method for the preservation of activated sludge of a waste water purification stage, wherein preservation of such activated sludge is accomplished by flushing with a gas mixture containing at least carbon dioxide and a low oxygen content.
Claims11
A method for the preservation of an activated sludge for the reuse in biological waste water purification stages, comprising the steps of:
- storing activated sludge which is to be preserved and subsequently introduced and used in a biological waste water purification stage;
- flushing the activated sludge with a gas to preserve the stored activated sludge prior to its use;
- and
- using as the flushing gas a gas containing at least carbon dioxide and to the extent that the flushing gas contains oxygen the flushing gas contains at least a reduced amount of oxygen in relation to air.
1 more element
Dependencies are inferred from the claim text.