Treatment of sewage sludge
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United States of America Patent
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Oct 26, 2004
Grant Date -
Dec 12, 2002
app pub date -
May 31, 2001
filing date -
Jun 1, 2000
priority date (Note) -
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Abstract
A method for reducing sludge viscosity of a sewage sludge having a solids concentration of at least 10% (w/w). The method comprises the steps of increasing the pH of the sludge to 9.5-12.5%, at least one step selected from subjecting the sludge to a holding step of at least one day and adding inorganic or organic chemicals to facilitate viscosity reduction, followed by incubating the sludge at temperature up to 100.degree. C., and subjecting the sludge to a shearing or disintegration step. The method provides sludge, especially concentrated sludge, that is more readily pumped or transported.
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