Sludge treatment process
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United States of America Patent
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-
May 16, 1989
Issued Date -
N/A
app pub date -
Aug 8, 1988
filing date -
Oct 29, 1986
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A system is described for producing small uniform pellets of predetermined size which are substantially free of fines from mechanically dewatered sewage sludge. The system includes a process and apparatus for mixing the dewatered sludge with previously dried, recycled particles of said sludge, drying said mixture in a thermal drier, separating a substantial portion of the dried solids from the drier off gas, clarifying said separated solids to separate the pellets of predetermined size, oversize pellets, and undersize pellets and particles, mechanically crushing the oversize pellets and admixing the crushed oversize pellets with the undersize pellets and particles, and recycling said mixture by mixing said mixture with incoming dewatered sludge to the drier.
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