Long vertical shaft bioreactor with modified waste liquor...

Details Long vertical shaft bioreactor with modified waste liquor... Long vertical shaft bioreactor with modified waste liquor...

C - Chemistry, Metallurgy

02

F

362/25

C02F 3/26 (2006.01) C02F 3/22 (2006.01)

Patent

CA 1114965

ABSTRACT OF THE DISCLOSURE An improved method and apparatus is provided for the treatment of sewage waste in a long vertical shaft bioreactor wherein waste sewage is caused to circulate under air injected oxidizing conditions around a loop comprising adjacent riser and downcomer chambers connected at their upper and lower ends. The improved method com- prises the steps of introducing influent waste at depth into the riser chamber at a point higher in the riser than the point of air injection and withdrawing treated effluent from the riser at a point lower in the riser than the point of air injection. A separation chamber may also be opera- tively connected to the riser chamber to recover sludge for return to the bioreactor. The method provides an improve- ment in oxygen uptake rate and reduces the anoxic zone in the reactor thus providing additional capacity for BOD5 removal,

338534

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