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US 7,669,348 B2Granted
Apparatus, method and system for treating sewage sludge
AssigneeRDP Company
InventorsRichard W. Christy, Robert Van Bramer, Michael Quici
Life of this patent
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AssigneeRDP Company
InventorsRichard W. Christy, Robert Van Bramer, Michael Quici
Estimating the term…
An apparatus, method and system is provided for treating sewage sludge by heating the same in a container to drive off pathogens and/or pasteurize the sewage sludge while the material is tumbled in the container and with moisture gases being evaporated therefrom and drawn off from the container. After treatment the treated sludge is discharged from the container. There is provided at least one weight-responsive member on which the container is mounted, and a control is provided connected to the one or more weight-responsive member whereby the solids content of the treated material can be determined by measuring the difference in weight of material in the container, before and after moisture is drawn off from the material and prior to its discharge from the drum. The control is preferably effected by means of a computer.
Apparatus for treating sewage sludge having a moisture content by drying and/or pasteurizing and/or otherwise chemically treating material comprising sludge and any added ingredients comprising:
A method of treating sewage sludge having a moisture content by drying and/or pasteurizing and/or otherwise chemically treating material comprising sludge and any added ingredients comprising:
The method of clam 25, wherein the drawing off step includes scrubbing gases drawn off the material being treated.
A system for treating sewage sludge having a moisture content, comprising a sludge storage silo, means for conveying sewage sludge with a moisture content from the silo into a treatment drum, means for tumbling the sludge within the drum, means for heating the sludge in the drum to evaporate moisture from the sludge, means for drawing off moisture gases from the sludge in the drum, means for discharging sludge from the drum into a take-off conveyor, means for conveying treated sludge through the discharge conveyor into a hopper, a hopper for receiving sludge from the discharge conveyor, at least one weight-responsive member on which the drum is mounted, and control means connected to the weight-responsive member(s), whereby the solids content of the treated material can be determined by measuring the difference in weight of the drum and the material in the drum, before and after moisture is drawn off from the material, prior to discharge of treated material from the drum.
Dependencies are inferred from the claim text.