Two-stage sludge drying apparatus and method
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United States of America Patent
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Nov 22, 1994
Grant Date -
N/A
app pub date -
Aug 2, 1993
filing date -
Aug 2, 1993
priority date (Note) -
Expired
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Abstract
A system for drying municipal sludge to reduce its moisture content and harmful pathogens to a level suitable for direct land application includes a cellular conveyor belt defining pockets which are filled with moist sludge and which is carried through multiple runs in a drying chamber over heat conducting supporting pans in a manner causing inversion of the sludge filled belt for at least one of the runs. Heated drying air is supplied directly to the sludge from above along each run and indirectly by conduction to the sludge from the supporting pans below along each run to provide uniform and rapid drying with maximum efficiency.
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