Article | REF: IN44 V1

Oxygenation and mixing process for biological wastewater treatment

Authors: Rodolphe Sardeing, Martine Poux, Catherine Xuereb

Publication date: July 10, 2005

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2. Aeration and mixing of biological purification basins

Aeration systems installed in biological treatment tanks have a dual purpose:

  • provide aerobic micro-organisms with the oxygen they need, usually borrowed from the air;

  • provide sufficient homogenization and mixing to ensure renewed contact between the living environment, the pollutants and the oxygenated water.

In most cases, these systems consist of a single device or a set of devices placed in a tank of a given volume and shape to perform both functions.

2.1 Surface aerators

Surface aerators can be divided into two groups:

  • slow-speed aerators ;

  • high-speed...

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Aeration and mixing of biological purification basins