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Sludge treatment − dissolved air flotation thickening
Dissolved air flotation thickens the sludge by encouraging solids to float to the surface by attaching to rising air bubbles
Sludge thickening
Introduction to sludge thickening
A number of processes act purely to remove water from the sludge to reduce its volume. As a result, the suspended solids concentration of the sludge is increased, i.e. the sludge becomes consolidated.
These processes are referred to as either thickening or dewatering, depending on the amount of water removed.
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Sludge treatment − gravity thickening
Gravity thickening increases the solids concentration by allowing the particles to settle to the base of a vessel
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Sludge treatment − rotary drum thickening
Rotary drum thickening thickens the sludge by agitating the solids in a slowly-rotating vessel with porous walls
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Sludge treatment − centrifugal thickening
Sludge concentration increases as particles are encouraged to migrate to the walls of a rapidly rotating cylindrical vessel
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Other sludge thickening processes
Other processes include membrane thickening − water is extracted through a membrane, increasing the solids concentration
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How do thickeners work?
An overview of thickeners and explanation of how they work
