Waste conversion process and products
AssigneeDynecology Incorporated
InventorHelmut W. Schulz
Life of this patent
Estimating the term…
Abstract
A process is disclosed for time production of fuel pellets or briquettes from sewage sludge solids and municipal solid waste with minimal drying requirements. In one of its more specific aspects, this invention relates to a solid pelleted or briquetted fuel product consisting essentially of sewage sludge solids, waste paper and/or refuse derived fuel, and crushed coal, and to its method of preparation. In still another of its specific aspects, this invention relates to a method for the production of fuel gases from sewage sludge solids and cellulosic wastes.
Claims25
A method for the preparation of a fuel briquette comprising sewage sludge solids, crushed coal, and cellulosic waste solids optionally including a binder which comprises:
- a. forming a mixture of dewatered sewage sludge containing from about 25 to about 50 weight percent solids with comminuted cellulosic waste solids selected from the group consisting of refuse derived fuel containing from about 5 to about 20 weight percent moisture and paper waste containing from about 0.5 to about 6 weight percent moisture in relative proportions such that the ratio of coal to cellulosic waste solids and sewage sludge solids is in the range of from about 1:1 to about 3:1 and the ratio of cellulosic waste solids to dewatered sewage sludge is in the range of from about 1.5:1 to about 5:1 and the moisture content of the resulting mixture is in the range of from about 12 to about 22 weight percent;
- and
- b. pressing the resulting mixture into briquettes or pellets at a pressure in the range of from about 1,000 to about 10,000 pounds per square inch.
A method for the preparation of briquettes consisting essentially of sewage sludge solids and cellulosic waste solids selected from the group consisting of paper waste and refuse derived fuel optionally including a binder which comprises forming a mixture of dewatered sewage sludge containing from about 25 to about 50 weight percent solids with refuse derived fuel containing from about 5 to about 20 weight percent moisture and paper waste containing from about 0.5 to about 6 weight percent moisture in relative proportions in the range of from about 1.5:1 to about 5:1 parts by weight cellulosic waste solids to dewatered sewage sludge and having a moisture content in the range of from about 12 to about 22 weight percent, and pressing the mixture into briquettes or pellets at a pressure in the range of from about 1000 psi to about 10,000 psi.
A composition of matter suitable for the preparation of bricks, briquettes or pellets by pressing said composition at a pressure in the range of from about 1000 psi to about 10,000 psi, said composition consisting essentially of dewatered sewage sludge, crushed coal, a binder and cellulosic waste solids selected from the group consisting of paper waste and refuse derived fuel, wherein the ratio of coal to cellulosic waste solids and sewage sludge solids is in the range of from about 1:1 to about 3:1 and the ratio of cellulosic waste to dewatered sewage sludge is in the range of from about 1.5:1 to about 5:1 and having a moisture content in the range of from about 12 to about 22 weight percent.
A composition of matter in the form of pressed bricks, briquettes or pellets useful as fuel said composition consisting essentially of sewage sludge solids binder, crushed coal and cellulosic waste solids selected from the group consisting of refuse derived fuel and paper waste wherein the ratio on a dry basis of coal to cellulosic waste solids and sewage sludge solids is in the range of from about 1:1 to about 3:1 and the ratio on a dry basis of cellulosic waste solids to sewage sludge solids is in the range of from about 3:1 to about 10:1.
A composition of matter in the form of pressed bricks, briquettes or pellets useful as fuel consisting essentially of sewage sludge solids and cellulosic waste solids selected from the group consisting of paper waste and refuse derived fuel comprising from about 65 to about 75 weight percent cellulosic waste, from about 6.5 to about 7.5 weight percent sewage sludge solids, from about 3 to about 6 weight percent lime, and from about 2 to about 6 weight percent binder.
A fuel composition in the form of bricks, briquettes or pellets useful as fuel comprising, in a dry basis, from about 3.5 to about 8.5 weight percent sewage sludge solids, from about 29 to about 36 weight percent cellulosic waste solids selected from the group consisting of refuse derived fuel and paper waste, from about 47 to about 61.5 weight percent crushed coal, from about 3 to about 6 weight percent lime, and from about 2 to about 6 weight percent binder solids.
A fuel composition in the form of bricks, briquettes or pellets comprising from about 6.5 to about 7.5 weight percent sewage sludge solids, from about 65 to about 75 weight percent cellulosic waste selected from the group consisting of paper waste and refuse derived fuel, from about 5 to about 10 weight percent lime, and from about 4 to 4.5 weight percent binder solids.
Dependencies are inferred from the claim text.