5. Flotation
Some waters (lakes and dams in particular) are relatively clear but colored or rich in algae: they therefore require high doses of coagulant without the floc being weighed down by matter initially suspended in the raw water; in such waters, settling is therefore often difficult. One solution is to make them float.
5.1 Principles and basic quantities
The flotation of colloidal suspended solids rarely occurs naturally (except for biological particles, fats, and hydrocarbons), so it must be induced. The most commonly used process is dissolved air flotation (DAF), also known as "pressurized water flotation," which aims to generate "couplings" between microbubbles of air (produced by pressurizing part of the recycled clarified...
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Flotation
Filtration
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