Drying and gas or vapor contact with solids – Process – With treated material recirculation
Patent
1992-05-14
1994-08-16
Bennet, Henry A.
Drying and gas or vapor contact with solids
Process
With treated material recirculation
34136, 34379, 34387, 34500, F26B 700
Patent
active
053374967
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.
REFERENCES:
patent: 2023247 (1935-12-01), Senseman
patent: 2148447 (1939-02-01), Dundas et al.
patent: 2152367 (1939-03-01), Smith
patent: 2157775 (1939-05-01), Smith
patent: 2350162 (1944-05-01), Gordon
patent: 3785063 (1974-01-01), Bishop
patent: 4177575 (1979-12-01), Brooks
patent: 4558525 (1985-12-01), Duske et al.
patent: 4829678 (1989-05-01), Glorioso
Jan. 17, 1990, discovery deposition of Richard E. Birner (transcript and deposition exhibits), (Appendix A attached).
"The C-E Raymond Flash Drying and Incineration System for Sewage Sludge Disposal", by Combustion Engineering, Inc., Copyright 1957.
Bennet Henry A.
Enviro-Gro Technologies
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