C - Chemistry – Metallurgy – 02 – F
Patent
C - Chemistry, Metallurgy
02
F
362/17
C02F 3/12 (2006.01)
Patent
CA 1143487
ABSTRACT OF THE DISCLOSURE A biological waste water treatment carried out in a single tank. The conditions in the tank are controlled to provide a biological reaction zone containing waste water and biodegrading organisms and an overlying clarification zone from which an effluent of treated waste water flows. To maintain these conditions, a recycle stream is continuously withdrawn from the biological reaction zone, passed through an oxygen- dissolving device, and supplemented with influent raw waste water and the supplemented stream returned to the reaction zone. The oxygen in the biological reaction zone is monitored and supplied to the oxygen-dissolving device in an amount to satisfy the demands of the organisms and, at the same time, to keep the oxygen in solution. For preferred results, the supplemented recycle stream is continuously injected, at one vicinity, along the bottom of the biological reaction zone in a horizontal shallow inflow having a width substantially greater than its depth and at a flow rate considerably greater than that of the raw influent. The recycle stream is withdrawn from near the bottom of the reaction zone, at a vicinity remote from that of the inflow, in an outflow having a substantially greater width than its depth. In this way, there is created, between the inflow and the outflow, a horizontally relatively fast flowing undercurrent of initially high dissolved-oxygen content, and having an extensive uninterrupted interface with an overlying relatively quiescent body of mixed liquor flowing upwardly relatively slowly.
339740
Hornsey Derek
Lee Robert G.h.
Savard Guy
Canadian Liquid Air Ltd./air Liquide Canada Ltee
Sherman
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