
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
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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.
Learn moreDissolved air flotation thickens the sludge by encouraging solids to float to the surface by attaching to rising air bubbles
Check out our growing list of sludge treatment technical features
GBT thickens the sludge by allowing the water to drain from the sludge under gravity through a permeable moving belt
Gravity thickening increases the solids concentration by allowing the particles to settle to the base of a vessel
Rotary drum thickening thickens the sludge by agitating the solids in a slowly-rotating vessel with porous walls
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Sludge concentration increases as particles are encouraged to migrate to the walls of a rapidly rotating cylindrical vessel
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Other processes include membrane thickening − water is extracted through a membrane, increasing the solids concentration
Microwave drying of mechanically-dewatered sewage sludge presents an alternative to the conventional convective and conductive thermal drying technologies. MW drying offers higher throughput capacities, and may be viable at smaller scales.
Read articleAn overview of thickeners and explanation of how they work