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activated sludge process
How is sewage and industrial wastewater reclaimed for use?
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secondary treatment: Media

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Videos

How is sewage and industrial wastewater reclaimed for use?
Steps in the modern treatment of wastewater.
Video: Encyclopædia Britannica, Inc.

Images

activated sludge process
Primary and secondary treatment of sewage, using the activated sludge process.
Encyclopædia Britannica, Inc.