Waste Water Treatment Sludge

Sludge is the semi-solid residue produced during wastewater treatment after the removal of suspended solids, organic matter, and contaminants from sewage or industrial effluents.
It is generated at different stages of treatment: primary sludge from sedimentation tanks, secondary sludge from biological treatment (activated sludge process), and sometimes tertiary sludge from advanced treatment processes.
Treatment of sludge involves thickening, stabilization (using aerobic or anaerobic digestion), dewatering, and sometimes drying to reduce volume and make it safe for disposal or reuse.
Treated sludge can be used as biofertilizer, soil conditioner, or in biogas production, contributing to resource recovery and sustainable waste management