Apparatus and process for forming uniform, pelletizable sludge product
Patent 4872998 Issued on October 10, 1989. Estimated Expiration Date: 
June 10, 2008. 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.
June 10, 2008. 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. 205345 filed on 06/10/1988US Classes:210/710, Treating the insoluble substance34/69, Diverse types of liquid removers only71/12, From sewage or night soil210/179, With mechanical agitator or movable separator210/180, Vapor or gas removal210/188, WITH GAS SEPARATOR210/202, Diverse type210/737, Including temperature change210/770Including drying (e.g., by squeezing or heating, etc.)ExaminersPrimary: Hruskoci, Peter A.Assistant: Upton, Christopher Attorney, Agent or FirmForeign Patent References
International ClassC02F 011/14AbstractAn automated, non-polluting process and apparatus for mechanically dewatering and heat drying liquid sewage sludge of widely varying solids content to form a pelletizable, dried sludge of predetermined uniform solids content without requiring recycling of previously heat processed sludge. Prior to being dried, the sludge is mixed with flocculation and coagulation promoting chemicals and is dewatered in a belt-type press. Drying takes place within an indirect heat dryer including an enclosed housing for capturing all gases and particles entrained in the gas driven off during the drying process. The gases and particles are advanced by means of a fan first through a cyclone separator for removing dust particles and next through a water jet scrubber prior to being exhausted or burned in order to control odor. The dust removed by the cyclone separator is recombined with the output from the indirect dryer prior to being pelletized. An automated start-up and shut-down control circuit is disclosed for producing the maximum degree of automation of the overall system and process.Other References
Field of SearchIncluding temperature changeIncluding drying (e.g., by squeezing or heating, etc.) Including temperature change Treating the insoluble substance Plural separating With mechanical agitator or movable separator Vapor or gas removal Flow line connected in series with distinct separator Diverse separators WITH GAS SEPARATOR Diverse type Diverse types of liquid removers only Stationary receptacle or tube with agitator or conveyor From sewage or night soil | |
