Method and apparatus for drying sludge
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United States of America Patent
Stats
-
Jul 12, 1988
Grant Date -
N/A
app pub date -
Sep 10, 1986
filing date -
Sep 10, 1986
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus and method for removing water from sludge waste material is provided. A layer of sludge is disposed upon an endless screen belt which is in turn dragged across a heated plate such that water in the sludge is evaporated and escapes from the sludge as steam. The endless screen is formed by a chain link belt which provides a plurality of discrete containers for small volumes of the sludge. The sludge may also be preheated just prior to drying by the injection of hot air columns into the sludge, such that the sludge is heated and agitated. The steam escaping from the drying sludge is directed into a heat exchanger which in turn heats the preheating air. Waste gases from a heating station are returned to the burner at the heating station to oxidize foul smelling chemicals and then reduce the odors generated by a sludge drying operation. If it is desired to retain some of the proteins in the sludge, the temperature of the heated plate is regulated such that the temperature if the sludge is not raised above approximately 256 degrees Fahrenheit, which is the point at which many proteins are effectively destroyed.
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