Process for preparing organic compost from municipal refuse

  • US 5,082,486 A
  • Filed: 11/16/1990
  • Issued: 01/21/1992
  • Est. Priority Date: 04/08/1987
  • Status: Expired due to Term
First Claim
Patent Images

1. A process for preparing an organic compost material with a water content of from about 45 to about 92 weight percent, a carbon content of from about 27 to about 85 weight percent (by weight of dry compost material), a pH of from about 6.2 to about 8.0, and a particle size distribution such that substantially zero percent of the particles in the compost material are greater than about 2.0 inches, from about 0.5 to about 35 weight percent of the particles in the compost material are greater than 1.0 inch, from about 0.5 to about 35 percent of the particles in the compost material are less than 1.0 inch but greater than 0.25 inches, and at least about 50 weight percent of the particles in the compost material are smaller than about 0.25 inches, comprising the steps of:

  • (a) providing a shredded refuse material, wherein;

    1. said shredded material has a particle size such that substantially all of its particles are smaller than 5.0 inches;

    2. said shredded material is comprised of from about 5 to about 96 weight percent of a cellulosic material selected from the group consisting of alpha-cellulose, beta-cellulose, gamma-cellulose, and mixture thereof; and

    3. at least about 20 weight percent of said cellulosic material in said shredded material is wood cellulose with a degree of polymerization of less than about 900;

    (b) adding a sufficient amount of water to said shredded refuse material to saturate it with water;

    (c) providing an earthworm material which is a mixture of earthworm castings and a material selected from the group consisting of earthworms, earthworm eggs, and mixtures thereof;

    (d) contacting said saturated shredded refuse material with said earthworm material to form a compostable mass of material which consist from about 20 to about 2,000 pounds of earthworm castings and from about 1 to about 100 pounds of earthworm material selected from the group consisting of earthworms, earthworm eggs, and mixtures thereof, for each ton of saturated, shredded refuse material in said compostable mass;

    (e) for at least about the first thirty days after said compostable mass has been formed, maintaining the water content in said compostable mass at a concentration of at least about 80 percent by adding water to said compostable mass; and

    (f) subjecting said compostable mass to a temperature of from about 0 to about 54 degrees centigrade while maintaining the water content in said compostable mass at a concentration of from about 45 to about 92 weight percent for from about 4 to about 8 months.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×