Water Pollution Control

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 Processes

 Glossary / Definitions

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Environmental Services

Historical Info

Plant History

Stage 5 - Aeration

The effluent from the primary settling tanks flows to the biological treatment stage which is called the "Activated Sludge" Process. This secondary treatment stage is a natural purification process using aerobic micro organisms in the wastewater and oxygen, and is a controlled and balanced biological environment. Large quantities of oxygen and return sludge (from the final clarifiers) are required. The wastewater is retained here for about three hours while the micro organisms consume impurities in the water.