Sludge treatment system
Patent 5279637 Issued on January 18, 1994. Estimated Expiration Date: 
January 18, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
January 18, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesInventorsAssigneeApplicationNo. 601906 filed on 10/23/1990US Classes:71/12, From sewage or night soil71/63, Carbonates, oxides, sulfates, halides, etc.71/64.01, Forms or conditioning165/92, Hollow strirrer or scraper210/702, Making an insoluble substance or accreting suspended constituents210/710, Treating the insoluble substance210/769, Destroying cake or solid component210/770Including drying (e.g., by squeezing or heating, etc.)ExaminersPrimary: Lander, Ferris H.Attorney, Agent or FirmForeign Patent References
International ClassesC05F 007/00C02F 011/00 AbstractA 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.Other References
Field of SearchMaking an insoluble substance or accreting suspended constituentsTreating the insoluble substance Including treating separated solids Destroying cake or solid component Including drying (e.g., by squeezing or heating, etc.) By gas contact From sewage or night soil With other organic material Guano, stable manure, etc. Carbonates, oxides, sulfates, halides, etc. Forms or conditioning | |
