Method and apparatus for purifying sewage by means of...

Details Method and apparatus for purifying sewage by means of... Method and apparatus for purifying sewage by means of...

C - Chemistry, Metallurgy

02

F

362/17

C02F 3/12 (2006.01)

Patent

CA 1140278

ABSTRACT OF THE DISCLOSURE An apparatus and method for purifying sewage by means of activated sludge, whereby the raw sewage to be purified is passed consecutively to a reaction tank for aeration, an aeration tank for further aeration, and a sedimentation tank. Part of the raw sewage is passed directly to the aeration tank. The settled and concen- trated activated sludge is passed from the sedimentation tank, partly to the reaction tank and partly to the aera- tion tank. The mixture is aerated in the reaction tank and/or the aeration tank and, dependent upon the 02 content, is circulated, rotated and/or concentrated. At least two treatment units of the apparatus, each containing a re- action tank and an aeration tank are arranged in parallel, the units being aerated intermittently while otherwise operating in parallel.

361571

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