Organic waste drying process

Details Organic waste drying process Organic waste drying process

1977-10-20

1978-10-24

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, 110224, F26B 700

Patent

active

041213491

ABSTRACT:
A process for drying organic waste, such as sewage sludge, by contacting the organic waste with hot vapors. In the preferred embodiment, adsorption of hydrocarbons vaporized during the drying step is achieved by mixing recycled dried solids into the drying zone effluent stream. The drying zone effluent stream is then separated into vapor and solids streams, with a portion of the solid stream being recycled as the adsorbent. The unrecycled portion of dry solids is preferably extruded in a separate operation to form compacted granules having good flow characteristics and suitable for application by commercial fertilizer spreaders. In another embodiment, a vapor stream derived from the drying zone effluent stream is contacted with the dry solids downstream of the solids-vapor separation zone to effect the adsorption of hydrocarbon vapors.

REFERENCES:
patent: 2977214 (1961-03-01), McLellan
patent: 3667131 (1972-06-01), Stephanoff
patent: 4003136 (1977-01-01), Vincent
patent: 4057392 (1977-11-01), O'Donnell

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