Particulate removal for a sludge treatment process
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United States of America Patent
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Feb 5, 1991
Issued Date -
N/A
app pub date -
Aug 4, 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 and a means for controlling odor from the production of said pellets. The system includes a process and apparatus for mixing the dewatered sludge with previously dried recycled particles of said sludge. Drying the 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, oversized pellets, and undersized pellets and particles, mechanically crushing the oversized pellets and admixing the crushed oversized pellets with the undersized pellets and particles and recycling said mixture for mixture with incoming dewatered sludge to the drier. The off-gas from the mechanical separation process is then passed through a two stage, in series, high pressure cyclone system to remove substantially all of the fines therefrom, without using a wet scrubber. The off-gas is then treated to remove odors and exhausted to the atmosphere.
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