Biogas plants have been used for decades to treat sewage sludge and increasingly used to treat faecal sludge. This process stabilizes, sanitize and reduces sludge volume while producing a valuable biogas.

Planted drying beds or planted dewatering beds are a specific treatment process for sewage sludge and are increasingly used to treat faecal sludge.
Sludge are dewatered and mineralized thanks to several mechanical, physical and biological processes.