Process for producing fuel from solid waste
First Claim
1. A process for recovering fuel, as well as other reusable materials, from municipal solid waste which includes paper and other fibrous materials, non-fibrous organic materials, metal, glass and other inorganic materials comprising:
- a. dry shredding the waste to pieces of a range of predetermined sizes,b. separating said shredded refuse by air classification into a light fraction which is predominantly paper and a heavy fraction,c. treating said heavy fraction to reduce the relatively frangible portions thereof to less than a predetermined particle size by subjecting said heavy fraction in the presence of a liquid to substantial and violent mechanical and hydraulic shear to form a slurry,d. separating the inorganics in said slurry from the organic material therein,e. dewatering said organic material to a particulate mass, andf. combining said particulate mass with said light fraction for use as fuel.
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Accused Products
Abstract
Municipal refuse is treated to produce fuel particularly useful for the operation of a power generating boiler by a process which is characterized by shredding of the as-received material, separation of the light materials prior to pulping of the heavy materials, and ultimate separation from the pulped materials of the inorganic constituents, after which the remaining slurry of predominantly organic materials is dewatered to produce a particulate fuel. The light materials separated after the initial shredding operation are then directly combind with the dewatered organic residue from the pulping operation to effect further reduction in the moisture content of the resultant mixture. The invention is especially applicable to communities where the garbage and trash are collected separately, with the lights produced by shredding and air classifying the trash being added to the fuel product produced by pulping the garbage.
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Citations
9 Claims
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1. A process for recovering fuel, as well as other reusable materials, from municipal solid waste which includes paper and other fibrous materials, non-fibrous organic materials, metal, glass and other inorganic materials comprising:
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a. dry shredding the waste to pieces of a range of predetermined sizes, b. separating said shredded refuse by air classification into a light fraction which is predominantly paper and a heavy fraction, c. treating said heavy fraction to reduce the relatively frangible portions thereof to less than a predetermined particle size by subjecting said heavy fraction in the presence of a liquid to substantial and violent mechanical and hydraulic shear to form a slurry, d. separating the inorganics in said slurry from the organic material therein, e. dewatering said organic material to a particulate mass, and f. combining said particulate mass with said light fraction for use as fuel. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification