CHALLENGES IN DRYING WASTEWATER SLUDGE

Dewatered sludge (Grosses Battes WWTP, Angleur, Belgium)

The stages towards incineration or agricultural use

Drying waste water sludge is an expense that must be minimized. About 13 million tons of municipal sludge (expressed as dry matter) are expected to be produced yearly by 2020 in the European Union. This indicates the size of the problem. Wastewater treatment plants (WWTP) remove screenings, grit, scum, solids and biosolids, collectively called sludge. Its properties are affected by many factors such as origin, history of treatment, duration and conditions of storage, etc. Drying this sludge is a difficult process.
A look into the main practical problems.


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