Drying and gas or vapor contact with solids – Process – With treated material recirculation
Patent
1995-02-10
1996-09-24
Larson, James
Drying and gas or vapor contact with solids
Process
With treated material recirculation
34381, 34384, 34 60, 71 13, 210770, F26B 700
Patent
active
055578730
ABSTRACT:
A method of converting industrial, domestic or other sludge, into a pelletized or granular fertilizer, as well as a sludge converter for practicing the method. The sludge is dewatered to form sludge cake solids which are dried in a dryer, and then sorted with a sorter into a sorted product comprising oversized, undersized, and standard sized product. Oversized product containing fibrous material is reduced in size by grinding in a hammermill. A portion of the sorted product is recycled for mixing and sizing in a mixer with the dewatered sludge cake solids. To control dust and odors, cyclones and a condenser remove a substantial portion of the gaseous particulate matter and condensable gases from the converter, and any remaining noncondensates are burned in the heat source flame. A waste oil burning heat source supplies heat energy to the dryer. The heat source exhaust gas by-products are filtered in a bag house using a conditioner additive, such as lime or sodium bicarbonate, which may be reclaimed and supplied to the standard sized product to serve as a pelletizing binder, to enhance the fertilizer nutrient value, or to enhance the fertilizer shelf life.
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Lynam Bart T.
Peterson Ronald V.
Larson James
PCL/SMI, A Joint Venture
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