Treatment of biological waste material

Details Treatment of biological waste material Treatment of biological waste material

B - Operations, Transporting

01

F

362/25, 165/66

B01F 3/04 (2006.01) C02F 3/12 (2006.01)

Patent

CA 1071528

ABSTRACT OF THE DISCLOSURE In an activated sludge process for the treatment of liquid wastes, liquid from the main reaction vessel is circulated downwardly through one or more vertical columns. Bubbles of oxygen are introduced at the bottom of the columns to rise upwardly relative to the liquid flow. A gas trap at the bottom of the last column collects small bubbles which are carried out of that column, and releases larger bubbles into the column. Advantageously, an air lift may be used to carry liquid from the main reaction vessel to the columns, and this serves to strip unwanted carbon dioxide from the liquid.

239786

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