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US 2009/0249641 A1Published application
Systems and Methods for Processing Municipal Wastewater Treatment Sewage Sludge
AssigneeWasteDry, LLC
InventorsRobert G. Graham, Tony A. Kuipers, T. Terry Tousey, Joseph C. Snodgrass, David E. Prouty
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Abstract
The present invention relates generally to systems and methods for drying and gasifying substances using the calorific value contained in the substances, and it more specifically relates to apparatus and methods for processing wet, pasty, sticky substances, such as municipal wastewater treatment sewage sludge, into a workable, powdered product.
Claims21
A method for processing a sewage sludge composition comprising the steps of:
- drying the sewage sludge composition into a partially dried compound;
- converting a portion of the partially dried compound into a gaseous fuel;
- combusting the gaseous fuel to produce a hot flue gas;
- using the hot flue gas to heat air;
- and
- using the heated air to dry the sewage sludge composition.
3 more elements
A method for processing a sewage sludge composition comprising the steps of:
- drying the sewage sludge composition into a partially dried compound;
- converting a portion of the partially dried compound into a gaseous fuel;
- combusting the gaseous fuel to produce heat;
- and
- using the heat to dry the sewage sludge composition.
2 more elements
A system for processing a sewage sludge, comprising:
- a dryer for partially drying the sewage sludge;
- a gasifier for converting the partially dried sewage sludge into a gaseous fuel;
- and
- an oxidizer for combusting the gaseous fuel to produce heat, wherein the heat is used to directly or indirectly partially dry the sewage sludge in the dryer.
1 more element
Dependencies are inferred from the claim text.