Dewatering of sludge from water purification plants is a physical treatment to which the sludge produced by the water purification system is subjected. Dewatering is necessary to reduce the percentage of water in the sludge and make its management easier and less expensive.
Sludge dewatering can be carried out in various ways, the most commonly used are the bag dewatering also called gravity dewatering in small sewage plants and the plate filterpress dewatering in plants with significant sludge production.
Bag dewatering is simple and economical, filter bags collect the sludge that is freed from the water by gravity and is dewatered, this solution is excellent in the case of small sewage plants and low sludge production because the limit is given by the dewatering time and by the manual skill required to replace the sludge.
The other solution widely used in chemical-physical treatment plants is the plate filterpress.
Sludge filter presses can be of several types: automatic, semi-automatic and manual, the sizing is based on the expected volume of sludge and its initial percentage of dryness.
With these values it is possible to evaluate the type of automation and its size, the filter presses must be fed by electric pumps or pneumatic pumps that develop a pressure of about 12 bar and can be made with an interposed membrane or plunger piston.
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