United States Patent [19] [n] Patent Number: 4,860,671
Glorioso [45] Date of Patent: Aug. 29, 1989
[54] ODOR CONTROL FOR A SLUDGE TREATMENT PROCESS
[75] Inventor: John D. Glorioso, Clearwater, Fla.
[73] Assignee: Enviro-Gro Technologies, Inc., Baltimore, Md.
[21] Appl. No.: 220,207
[22] Filed: Jul. 18,1988
Related U.S. Application Data
[63] Continuation-in-part of Ser. No. 924,630, Oct. 29,1986, Pat. No. 4,761,893.
[51] Int. CI.4 F23J 15/00; F26B 3/24
[52] U.S. a 110/236; 110/215;
110/210; 34/11; 34/35; 34/86
[58] Field of Search 34/9, 11, 14, 35, 86,
34/95, 102; 432/197, 215; 110/215, 210, 236
[56] References Cited
U.S. PATENT DOCUMENTS
3,410,233 11/1968 Seiler 34/11
3,707,774 1/1973 Eise et al 34/14
3,864,841 2/1975 McGehee 34/11
3,963,471 6/1976 Hampton 34/11
4,040,190 8/1977 Van Den Broeck 34/11
4,130,945 12/1978 Brachthause 34/11
4,245,396 1/1981 Maffet 34/14
4,357,152 11/1982 Duske et al 110/215
4,429,643 2/1984 Mucholland 110/215
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 condenser to remove some of the water therein, and is routed to an afterburner wherein it is burned. The off-gas from the afterburner then passes through a heat exchanger with fresh air to heat the fresh air which is then routed to the drier as combustion gas.
18 Claims, 3 Drawing Sheets
