Organic waste dewatering and drying process

Details Organic waste dewatering and drying process Organic waste dewatering and drying process

1977-07-07

1978-07-04

Sebastian, Leland A.

Drying and gas or vapor contact with solids

Apparatus

With means to treat gas or vapor

34 60, 34 61, 34 62, 71 12, 71 13, 71 14, 110221, 110224, F26B 700

Patent

active

040980065

ABSTRACT:
A process for drying organic waste, such as sewage sludge, by contacting the organic waste with hot vapors. Partial dewatering of the organic waste is achieved by admixture with a recycled portion of dried solids followed by extrusion of the mixture. The resultant extrudate is then dried, and the unrecycled portion is extruded in a separate operation to form compacted granules having good flow characteristics and suitable for application by commercial fertilizer spreaders. A plasticizer and an extrusion aid may be added to the dried material prior to extrusion.

REFERENCES:
patent: 2977214 (1961-03-01), McLellan
patent: 3667131 (1972-06-01), Stephanoff
patent: 3695173 (1972-10-01), Cox
patent: 3938434 (1976-02-01), Cox
patent: 4003136 (1977-01-01), Vincent et al.
patent: 4038181 (1977-07-01), Talbert
patent: 4041854 (1977-08-01), Cox

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