Valorisation of municipal and industrial sludges
Final products of wastewater treatment plants – WWTP, are clean water and waste sludge. In the majority of cases, these sludges fall into a group of non-hazardous/non-inert wastes with a code number of 19 08 05, and exactly that non-inertness is one of the reasons why their disposal on landfills is prohibited. Sludge, as such, presents an ecologically problematic material that must undergo some sort of treatment before its final disposal.
Sludges cannot be landfilled for multiple reasons: