Method and apparatus for reducing volatile content of sewage sludge and other feed materials
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United States of America Patent
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-
Nov 23, 1993
Grant Date -
N/A
app pub date -
Mar 20, 1989
filing date -
Mar 20, 1989
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Apparatus for the drying of sludges and other fouling feed materials. A rotary screw type indirect heat exchanger is provided having at least one screw member. The screw member includes a helical-shaped flight having a helix angle of about 10 degrees or less and a surface roughness of about 63 micro-inches or less. Means are provided for rotating and heating the screw member and for spreading feed material onto the screw member. The apparatus operates at heat transfer rates and for a time period sufficient to reduce the moisture content of the feed material without requiring mechanical cleaning of feed material foulants from the screw member.
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