C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/17
C02F 3/22 (2006.01) C02F 3/12 (2006.01) C02F 3/16 (2006.01) C02F 3/26 (2006.01)
Patent
CA 1049162
METHOD FOR THE BIOLOGICAL PURIFICATION OF METHOD FOR THE BIOLOGICAL PURIFICATION OF EFFLUENT AND THE PLANT FOR CARRYING OUT THE PROCESS ABSTRACT OF DISCLOSURE Effluent to be biologically purified is poured serially through three interconnected tanks with the first two tanks acting as activation tanks and the last tank acting as a post-clarification tank. After the concentra- tion of activated sludge in the first tank has dropped to a predetermined value, the flow through the tanks is re- versed so that the last tank, previously the post clarifi- cation tank, acts as one of the activation tanks, and the first tank, previously one of the activation tanks, acts as the post clarification tank, whilst the middle tank con- tinued to operate as the other of the activation tanks. In one embodiment, an aerator is provided in each tank and the aerators in the first and last tanks are switched on or off depending upon the direction of flow of effluent. In another embodiment, two movable aerators are provided and are disposed in use, in those tanks which are acting for the time being as activation tanks. This invention relates to a process for the bio- logical purification of effluent and a plant for carrying out the process. S P E C I F I C A T I O N
239868
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