Topic
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.
Learn more
More on sludge thickening
Topic
Sludge treatment − gravity thickening
Gravity thickening increases the solids concentration by allowing the particles to settle to the base of a vessel
Topic
Sludge treatment − rotary drum thickening
Rotary drum thickening thickens the sludge by agitating the solids in a slowly-rotating vessel with porous walls
Topic
Sludge treatment − centrifugal thickening
Sludge concentration increases as particles are encouraged to migrate to the walls of a rapidly rotating cylindrical vessel
Sponsored
Watermaths - 3rd edition ebook out now
Watermaths: Process Fundamentals for the Design and Operation of Water and Wastewater Treatment Technologies − available as an ebook
Topic
Other sludge thickening processes
Other processes include membrane thickening − water is extracted through a membrane, increasing the solids concentration
From our sponsors…
Latest features and blogs
Blog
How much is sludge worth?
The UK regulator OFWAT has introduced legislation based on the notion of sludge as a resource. Its value is often expressed in terms of calorific content, and the phosphate is also potentially recoverable. But how exactly should sludge value be quantified?
Read article
How do thickeners work?
An overview of thickeners and explanation of how they work
