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US Patent 5279637 - Sludge treatment system
US Patent Issued on January 18, 1994
Estimated Patent Expiration Date:
January 18, 2011Estimated 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.
Estimated Patent Expiration Date:
January 18, 2011Estimated 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.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
| InventorsAssigneeApplicationNo. 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.)Field of Search210/702, Making an insoluble substance or accreting suspended constituents210/710, Treating the insoluble substance210/768, Including treating separated solids210/769, Destroying cake or solid component210/770, Including drying (e.g., by squeezing or heating, etc.)210/771, By gas contact71/12, From sewage or night soil71/13, With other organic material71/21, Guano, stable manure, etc.71/63, Carbonates, oxides, sulfates, halides, etc.71/64.01Forms or conditioningExaminersPrimary: Lander, Ferris H.Attorney, Agent or FirmUS Patent ReferencesRe31185, 548561, 659503, 1915240, 2977214, 3025151, 3342731, 3676074, 3695432, 3800865, 3909410, 3960725, Method for sludge treatmentIssued on: 06/01/1976 Inventor: Bjermo , et al.3963471, Apparatus and process for producing an organic product from sewage sludge Issued on: 06/15/1976 Inventor: Hampton4097378, Multiple effect evaporation of water from water containing combustible sludges Issued on: 06/27/1978 Inventor: St. Clair4321151, Process for wastewater treatment and wastewater sludge conversion into energy Issued on: 03/23/1982 Inventor: McMullen4402834, Method for dewatering sludge-type material Issued on: 09/06/1983 Inventor: Bastgen , et al.4660628, Heat exchanger Issued on: 04/28/1987 Inventor: Solberg , et al.4795568, Oxidative evaporation process and apparatus Issued on: 01/03/1989 Inventor: Chen4872998Apparatus and process for forming uniform, pelletizable sludge product Issued on: 10/10/1989 Inventor: Dausman, et al. Foreign Patent References
International ClassesC05F 007/00C02F 011/00 |
