C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/25
C02F 3/22 (2006.01) C02F 3/00 (2006.01)
Patent
CA 1152658
B 31246 Abstract Method and apparatus for the treatment of wastewater This invention provides a method for treating waste- water by circulating wastewater around a system comprising a downcomer and a riser which communicate directly at their lower ends, the level of the wastewater in the downcomer being main- tained above the level of the wastewater in the riser to provide a hydrostatic pressure head which causes circulation of the wastewater around the system, supplying a gas containing oxygen to the wastewater as it passes through the downcomer, pumping the wastewater from the top of the riser back into the top of the downcomer and removing treated wastewater from the riser at the same rate as wastewater is introduced into the system character- ised in that the height of the hydrostatic pressure head is con- trolled by adjusting the height at which treated wastewater is removed from the riser and the level of the wastewater in the riser. The invention also provides an apparatus for putting the method into practice.
374615
Ballantyne Donald G.
Zeneca Limited
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