Sludge treatment system

Chemistry: fertilizers – Processes and products – Organic material-containing

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Details

71 63, 71 6401, 210702, 210710, 210769, 210770, 165 92, C05F 700, C02F 1100

Patent

active

052796370

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. 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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E. B. Pike, "Long-Term Storage of Sewage Sludge, " Disinfecting Sewage Sludge: Tech., Econ. Microbiol. Aspects, pp. 212-225 (United Kingdom, 1983).

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