Sludge refers to the thick, semi-solid material that accumulates at the bottom of wastewater treatment systems like septic tanks or during industrial processes. It contains a mixture of organic and inorganic matter.
Related terms
Biosolids: Biosolids are treated and processed sludge that can be used as fertilizer or soil conditioner.
Dewatering: Dewatering is the process of removing water from sludge to reduce its volume before disposal or further treatment.