Lime enhanced pressure filtration of iron and steel making sludge
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United States of America Patent
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Dec 28, 1999
Grant Date -
N/A
app pub date -
Aug 21, 1997
filing date -
Aug 21, 1997
priority date (Note) -
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Abstract
A method is provided for improving the filtration rate of nonhazardous wastewater streams generated at a steel plant. The solids are concentrated in the wastewater stream. No more than about 5% by weight of lime is added to the concentrated wastewater stream which is then dewatered. A friable filter cake is produced by allowing the solids to harden. The lime addition results in a significant increase in the rate at which the stream may be filtered.
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