Article | REF: C5200 V1

Distribution water - Unit treatments

Author: Hugues GODART

Publication date: May 10, 2000

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3. Biological treatments

Some micro-organisms attack mineral or organic compounds through oxidizing or reducing actions.

Example

nitrate-reducing bacteria reduce nitrates to various nitrogen compounds, including nitrogen gas in the final stage. In contrast, nitrifying bacteria oxidize ammonia into various forms of nitrogen.

These bacteria each thrive under different optimum conditions, but in general they grow better at medium-high temperatures of 15 to 25°C than at low temperatures below 10°C.

Bacteria also degrade organic matter and eliminate elements such as iron and manganese.

3.1 Ammonia nitrification

Biological processes can arise spontaneously at any point...

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