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Article | REF: C5223 V2

Urban wastewater treatment - Extensive technologies and tertiary treatments

Author: Jean-Marc BERLAND

Publication date: August 10, 2024 | Lire en français

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    3. Free cultures: mechanisms at play

    Free-culture" purification mechanisms are based on the growth of a bacterial culture that is predominantly, but not exclusively, aerobic. Oxygen is supplied by different sources, depending on the plant. Extensive free-culture systems are processes that reproduce and intensify certain self-purification mechanisms that occur naturally in aquatic environments.

    Self-purification, which we will examine in greater detail, is the process by which an aquatic ecosystem, such as a river or lake, naturally breaks down the biological pollutants present in the water, without recourse to artificial treatment facilities.

    Various mechanisms involved in the self-purification of wastewater in aquatic environments are at play in extensive free-range cultivation.

    • Dilution

      When wastewater...

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