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US Patent 5279637 - Sludge treatment system

US Patent Issued on January 18, 1994
Estimated Patent Expiration Date: Icon_subject 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.
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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.

Other References

  • Pike, Long Term Storage of Sewage Slude 1983, CA 98(20):166362t
  • E. B. Pike, "Long-Term Storage of Sewage Sludge, " Disinfecting Sewage Sludge: Tech., Econ. Microbiol. Aspects, pp. 212-225 (United Kingdom, 1983

Inventors

Assignee

Application

No. 601906 filed on 10/23/1990

US 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 Search

210/702, 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 conditioning

Examiners

Primary: Lander, Ferris H.

Attorney, Agent or Firm

US Patent References

Re31185, 548561, 659503, 1915240, 2977214, 3025151, 3342731, 3676074, 3695432, 3800865, 3909410, 3960725, Method for sludge treatment
Issued 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: Hampton
4097378, Multiple effect evaporation of water from water containing combustible sludges
Issued on: 06/27/1978
Inventor: St. Clair
4321151, Process for wastewater treatment and wastewater sludge conversion into energy
Issued on: 03/23/1982
Inventor: McMullen
4402834, 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: Chen
4872998Apparatus and process for forming uniform, pelletizable sludge product
Issued on: 10/10/1989
Inventor: Dausman, et al.

Foreign Patent References

  • 54-39372 JP. 03/21/1979

International Classes

C05F 007/00
C02F 011/00

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