dewatering

Dewatering is an industrial process used to remove water from materials, particularly sludge generated during wastewater treatment. The primary goals of dewatering sludge are to reduce its volume, making it easier and cheaper to handle and dispose of, and to stabilize the organic materials within it.123

While dewatered sludge still contains a significant amount of water, often around 70 percent, it can be handled as a solid rather than a liquid. Simple methods include using sludge-drying beds, where the sludge slurry is spread on sand and allowed to dry through evaporation and drainage. More advanced mechanical methods like rotary drum vacuum filters, centrifuges, and belt filter presses are also employed, often requiring a preliminary step called sludge conditioning.3