Liquefying de-watered sludge preparatory to drying
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United States of America Patent
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Sep 6, 2011
Grant Date -
Dec 11, 2008
app pub date -
Mar 3, 2008
filing date -
Mar 6, 2007
priority date (Note) -
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Abstract
Sewage sludge that has been de-watered to 25% solids is subjected to a combination of shearing and heating that liquefies the sludge, and drops its viscosity to below 12,000 cP. The fact of liquefaction prepares the sludge such that subsequent drying can be done more cost-effectively than hitherto. After drying, the dried sludge can be incinerated.
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