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Dewatering removes water from sludge (residual sludge from wastewater treatment plants such as activated sludge systems, or faecal sludge from on-site sanitation such as septic tanks or pit latrines) making it easier to handle and less expensive to transport, to compost (see also small or large scale composting), to incinerate (see also small or large scale incineration) or to dispose of in a landfill.
The process of dewatering water plant lagoon sludge involves pumping the sludge through a static mixer while adding a flocculent (polymer) to condition the sludge on its way to the dewatering box. The system is capable of dewatering 12,000 gallons of 1.5% solids sludge per day.