Biological reactors using a culture fixed on a fluidized bed are suitable for many applications in waste water treatment.

A large number of studies have been carried out at the pilot-plant scale but none exists at the industrial scale for municipal waste water treatment. Examples are:

- Dorr Oliver (Sutton + Mishra) (1)

- The Biolex process developed by EBARA (2)

- The reactor described by Heijnen (Holland) (3)

In the latter two processes, fluidization and aeration are provided by an air-lift system inside the reactor. This article describes the Biolift process whose original feature is that the air-lift system is outside the reactor and is assisted by a system to inject secondary air (process air) into the reactor. This combination allows tight control of fluidization and aeration factors.

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