Method for biological purification of waste water

Details Method for biological purification of waste water Method for biological purification of waste water

C - Chemistry, Metallurgy

02

F

362/17

C02F 3/02 (2006.01) C02F 1/38 (2006.01) C02F 3/12 (2006.01)

Patent

CA 1084179

ABSTRACT OF THE DISCLOSURE In a system for biological purification of waste water, the liquid flow from an oxygen addition stage is fed with a low sludge concentration to a sludge thickening zone within a separation unit, the flow in said zone being di- vided into a sludge phase with a high dry substance concen- tration of at least 2% and a liquid phase substantially free from sludge. At least part of the sludge phase is re- turned to the oxygen addition stage, and the liquid phase is fed to a clarification stage where sludge residue is re- moved from the liquid phase.

286948

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