Method of chemically fixing liquid aqueous sludge by means of a pozzolanic reaction
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United States of America Patent
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Aug 27, 1991
Grant Date -
N/A
app pub date -
Feb 23, 1990
filing date -
Feb 24, 1989
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A liquid aqueous sludge is transferred into a cylindrical-conical tank andgitated by blowing in air through a downwardly extending tube. A closed circulation of sludge is established between this main tank and a reagent tank by means of a recycling pump. The reagent tank overflows into the main tank. Chalk is added to the reagent tank and a pozzolanic material is added to the main tank. When the mixture of dilute sludge, chalk and possolanic material is homogeneous, it is transferred to a filter press by means of a further pump. The filter cake is collected for final storage or discharged to set slowly.
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