Before revision: Fecal sludge (a type of sludge) collected from pit latrines near Durban, South Africa, awaiting further treatment by drying Sludge is a semi-solid slurry that can be produced from a range of industrial processes, from water treatment, wastewater treatment or on-site sanitation systems.
After revision: Fecal sludge collected from pit latrines near Durban, South Africa, awaiting further treatment by drying Sludge is a semi-solid slurry that can be produced from a range of industrial processes, from water treatment, wastewater treatment or on-site sanitation systems.