Method for the composting of organic materials

• US 4,956,002 A
• Filed: 11/21/1989
• Issued: 09/11/1990
• Est. Priority Date: 11/21/1989
• Status: Expired due to Fees

• Current Assignee: David J. Egarian
• Original Assignee: David J. Egarian
• Inventors: Egarian, David J.
• Primary Examiner(s): LANDER, FERRIS
• Application Number:
  US07/439,828
• Time in Patent Office: 294 Days
• US Class Current: 71/9
• CPC Class Codes: C05F 17/00 Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
• CPC Class Codes: C05F 17/70 Controlling the treatment in response to process parameters
• CPC Class Codes: C05F 17/90 Apparatus therefor
• CPC Class Codes: Y02P 20/145 the feedstock being materials of biological origin
• CPC Class Codes: Y02W 30/40 Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
• CPC Class Codes: Y10S 71/901 Refuse conditioning

Abstract

Modular systems are disclosed for composting organic waste. The systems include a number of modular containers for holding predetermined amounts of the organic waste materials, these amounts being selected such that a relatively uniform temperature profile may be maintained within each of the modular containers. Each of the containers also includes an air inlet and an exhaust so that air may be circulated through the organic waste materials in each of the modular containers, a temperature probe for measuring the temperature in the modular containers, and a fan for circulating air from the exhaust of a first modular container to the air inlet of a second modular container when the temperature in the second modular container is greater than the temperature in the first modular container by a predetermined temperature difference, so as to accelerate the composting of said organic waste material.

Claims

1. A modular system for composting organic waste materials comprising a plurality of self-contained modular containers including a first modular container and a plurality of second modular containers for holding predetermined amounts of said organic waste materials for substantially the entire composting period, said plurality of modular containers having a size such that a relatively uniform temperature profile may be maintained within each of said plurality of modular containers, said first modular container holding said predetermined amount of said organic waste material which has been composting for a first period of time and said plurality of second modular containers holding said predetermined amounts of said organic waste material which have been composting for a plurality of second periods of time, said plurality of second periods of time being progressively shorter than said first period of time, each of said first and said plurality of second modular containers including air inlet means and exhaust means whereby air may be circulated through said predetermined amounts of said organic waste materials in each of said first and said plurality of second modular containers, temperature measuring means for measuring the temperature in said first and said plurality of second modular containers, interconnection means for selectively interconnecting said first modular container with a selected one of said plurality of second modular containers based upon said measured temperature of said selected one of said second plurality of containers being less than said temperature of said first modular container by a predetermined temperature difference, and circulation means for circulating ambient air separately through said first and said selected one of said plurality of second modular containers and for alternatively circulating ambient air through said first modular container and circulating said air from said exhaust means of said first modular container to the air inlet means of said selected one of said plurality of second modular containers, so as to accelerate the composting of said organic waste material in said selected one of said plurality of second modular containers.

2. The modular system of claim 1 wherein each of said plurality of modular containers includes a bottom surface and an upper surface, and wherein said air inlet means are located at said bottom surface of said modular containers and said exhaust means are located at said upper surface of said modular containers.

3. The modular system of claim 2 wherein said plurality of modular containers includes leachate drain means at said bottom surface of said modular containers for the withdrawal of leachate formed in said organic waste material therein.

4. The modular system of claim 1 wherein said circulation means includes fan means for forcing said air through said organic waste material in said plurality of modular containers.

5. The modular system of claim 4 wherein said fan means comprises a plurality of fan means for each of said plurality of modular containers, said first fan means for said first modular container and a plurality of second fan means for said plurality of second modular containers, respectively.

6. The modular system of claim 1 including carbonaceous material addition means for adding carbonaceous material to said organic waste material so as to control the carbon content of said organic waste material.

7. The modular system of claim 6 including bulk material addition means for adding a bulking agent to said organic waste material as to control the porosity of said organic waste material.

8. The modular system of claim 7 including weighing means for determining the weight of said organic waste material.

9. The modular system of claim 8 including mixing means for mixing said organic waste material.

10. The modular system of claim 8 including process control means for controlling said carbonaceous material addition means and said bulk material addition means in response to the weight of said organic waste material as determined by said weighing means.

11. The modular system of claim 1 wherein said predetermined amount of said organic waste material comprises approximately a one-day supply of said organic waste material, and wherein said plurality of modular containers comprises at least fourteen modular containers, whereby approximately two-weeks supply of said organic waste material may be contained within said modular system.

12. The modular system of claim 11 wherein said fourteen modular containers are paired into seven pairs of said second modular containers, with each of said pairs comprising modular containers containing organic waste material supplied to said system at .approximately seven-day intervals.

13. The modular system of claim 1 including enclosure means for enclosing said plurality of modular containers.

14. A method for composting organic waste materials comprising supplying predetermined amounts of said organic waste martial to a plurality of modular containers including a first modular container and a plurality of second modular containers, holding said predetermined amount of said organic waste material which has been composting for a first period of time in said first modular container and holding said predetermined amounts of said organic waste material which have been composting for a plurality of second periods of time in said plurality of second modular containers, said second periods of time being progressively shorter than said first period of time, said predetermined amounts being selected so that a relatively uniform temperature profile may be maintained within each of said plurality of modular containers, circulating air through said predetermined amounts of said organic waste material in each of said first and said plurality of second modular containers, measuring the temperature in said first and said plurality of second modular containers, interconnecting said first modular container with a selected one of said plurality of second modular containers based upon the measured temperature of said selected one of said plurality of second modular containers being less than said measured temperature of said first modular container by a predetermined temperature difference, and circulation at least a portion of said air which has passed through said organic waste material in said first modular container to said organic waste material in said selected one of said second modular containers, so as to accelerate the composting of said organic waste material in said selected one of said second modular containers.

15. The method of claim 14 wherein said circulating of said air through said predetermined amount of said organic waste material comprises passing said air upwardly through said organic waste material.

16. The method of claim 14 including withdrawing leachate created by said organic waste material from said plurality of modular containers.

17. The method of claim 14 including circulating a first supply of ambient air through said first modular container and a separate second supply of ambient air through said selected one of said plurality of second modular containers when said temperatures in said first and said selected one of said plurality of second modular containers vary by less than said predetermined temperature difference.

18. The method of claim 14 including adding carbonaceous material to said organic waste material prior to the supplying of said organic waste material to said plurality of modular containers, so as to control the carbon content of said organic waste material.

19. The method of claim 18 including adding bulk material to said organic waste material prior to the supplying of said organic waste material to said plurality of modular containers, so as to control the porosity of said organic waste material.

20. The method of claim 19 including weighing said organic waste material prior to the addition of said organic waste material to said plurality of modular containers.

21. The method of claim 20 including controlling the amount of said carbonaceous material and the amount of said bulk material added to said organic waste material in response to the determination of the weight of said organic waste material.

22. The method of claim 14 including mixing said organic waste material prior to the addition of said organic waste material to said plurality of modular containers.

23. The method of claim 14 wherein said predetermined amounts of said organic waste material comprise approximately a one-day supply of said organic waste material, and wherein said supplying of said predetermined amounts of organic waste material to said plurality of modular containers comprises supplying said predetermined amounts of organic waste materials to fourteen of said modular containers, whereby approximately two-weeks supply of said organic waste material may be contained therein.

24. The method of claim 23 including pairing said fourteen modular containers into seven pairs of said modular containers, in a manner such that each of said pairs of said modular containers includes organic waste materials supplied to said system at approximately seven-day intervals.

25. A modular system for composting organic waste materials comprising a plurality of modular containers including a first modular container and a second modular container for holding predetermined amounts of said organic waste materials for substantially the entire composting period, said plurality of modular containers having a size such that a relatively uniform temperature profile may be maintained in each of said plurality of modular containers, each of said first and second modular containers including air inlet means and exhaust means whereby air may be circulated through said predetermined amount of said organic waste materials in a first direction from said air inlet means to said exhaust means in each of said first and second modular containers, temperature measuring means for measuring the temperature in said first and second modular containers, and circulation means for circulating ambient air separately through said first and second modular containers in said first direction and for alternatively circulating ambient air through said first modular container in said first direction and circulating said air from said exhaust means of said first modular container to said air inlet means of said second modular container for circulating said air through said second modular container in said first direction, when said temperature in said first modular container is greater than said temperature in said second modular container by a predetermined temperature difference, so as to accelerate the composting of said organic waste material in said second modular container.

26. The modular system of claim 25 wherein each of said plurality of modular containers includes a bottom surface and an upper surface, and wherein said air inlet means are located at said bottom surfaces of said modular containers and said exhaust means are located at said upper surfaces of said modular containers, whereby said first direction comprises an upward direction in each of said modular containers.

27. The modular system of claim 25 wherein said circulation means includes fan means for forcing said air through said organic waste material in said plurality of modular containers.

28. The modular system of claim 27 wherein said circulation means includes valve means.

29. A modular system for composting organic waste materials composting a plurality of self-contained modular containers including a first modular container and a plurality of second modular containers for holding predetermined amounts of said organic waste materials for substantially the entire composting period, said plurality of modular containers having a size such that a relatively uniform temperature profile may be maintained within each of said plurality of modular containers, said first modular container holding said predetermined amount of said organic waste material which has been composting for a first period of time and said plurality of second modular containers holding said predetermined amounts of said organic waste material which have been composting for a plurality of second periods of time, said plurality of second periods of time being progressively shorter than said first period of time, each of said first and second modular containers including air inlet means and exhaust means whereby air may be circulated through said predetermined amounts of said organic waste materials in each of said first and said plurality of second modular containers, temperature measuring means for measuring the temperature in said first and said plurality of second modular containers, interconnection means for interconnecting said first modular container with a selected one of said plurality of second modular containers based upon said measured temperature of said selected one of said plurality of second modular containers being less than said measured temperature of said first modular container by a predetermined temperature difference, and circulation means for circulating air from said exhaust means of said first modular container to said air inlet means of said selected one of said plurality of several modular containers.

30. The modular system of claim 29 wherein the direction from said air inlet means to said exhaust means in each of said first and said plurality of said second modular containers comprises a first direction, and wherein said circulation means includes valve means for circulating air from said exhaust means of said first modular container to said air inlet means of said selected one of said plurality of second modular containers for circulating said air through said selected one of said second modular containers in said first direction.

31. The modular system of claim 30 wherein said circulation means includes means for alternatively circulating ambient air separately through said first and said selected one of said plurality of second modular containers in said first direction.

32. The modular system of claim 31 wherein each of said plurality of modular containers includes a bottom surface and an upper surface, and wherein said air inlet means are located at said bottom surfaces of said modular containers and said exhaust means are located at said upper surfaces of said modular containers, wherein said first direction comprises an upward direction.

33. The modular system of claim 32 wherein said plurality of modular containers includes leachate drain means at said bottom surfaces of said modular containers for the withdrawal of leachate formed in said organic waste material therein.

34. A method for composting organic waste materials comprising supplying a first predetermined amount of said organic waste material to a first modular container, composting said first predetermined amount of said organic waste material in said first modular container for a first period of time, supplying a second predetermined amount of said organic waste material to a second modular container, composting said second predetermined amount of said organic waste material in said second modular container for a second period of time, said first period of time being longer than said second period of time whereby said organic waste material in said first modular container has progressed to a greater degree of composting than said organic waste material in said second modular container, and each of said first and second predetermined amounts of said organic waste material in said first and second modular containers being selected so that a relatively uniform temperature profile may be maintained within each of said modular containers, and being entirely composed of organic waste material which has been composting for substantially the same periods of time, circulating air through said predetermined amounts of said organic waste material in each of said first and second modular containers during said first and second periods of time, and circulating at least a portion of said air which has passed through said organic waste material in said first modular container to said organic waste material in said second modular container when said temperature in said first modular container is greater than said temperature in said second modular container by a predetermined temperature difference, so as to accelerate the composting of said organic waste material in said second modular container.

35. The method of claim 34 wherein said circulating of said air through said predetermined amounts of said organic waste material in each of said first and second modular containers is carried out in a first direction.

36. The method of claim 35 wherein said first direction comprises an upward direction through said organic waste material.

37. The method of claim 34 including circulating a first supply of ambient air through said first modular container and a separate second supply of ambient air through said second modular container when said temperatures in said first and second modular containers vary by less than said predetermined temperature difference.

38. The method of claim 34 including adding carbonaceous material to said organic waste material prior to the supplying of said organic waste material to said plurality of modular containers, so as to control the carbon content of said organic waste material.

39. The method of claim 38 including adding bulk material to said organic waste material prior to the supplying of said organic waste material to said plurality of modular containers, so as to control the porosity of said organic material.