Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
  • B03B—SEPARATING SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS
  • B03B9/00—General arrangement of separating plant, e.g. flow sheets
  • B03B9/06—General arrangement of separating plant, e.g. flow sheets specially adapted for refuse
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
  • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
  • B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
  • Y02W30/00—Technologies for solid waste management
  • Y02W30/40—Bio-organic fraction processing; Production of fertilisers from the organic fraction of waste or refuse
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
  • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y10S71/00—Chemistry: fertilizers
  • Y10S71/901—Refuse conditioning

Definitions

• the invention relates to improvements in methods and apparatus for the continuous treatment of refuse such as garbage.
• a still further object of the invention is to provide an improved method and apparatus ' for the treatment of waste in an improved manner wherein a continuous process may be employed effecting economies in the costs of energy not heretofore available.
• a still further object of the invention is to provide an improved method and apparatus for the treating of garbage and similar wastes to increase the value and use of by-products obtained.
• a still further object of the invention is to provide an improved method and apparatus wherein initial treatments encompass a dry processing of the material and subsequent continuous treatment involves handling the material in a rotary drum in an aqueous solution with subsequent pulping of one of the waste by-products and anaerobic treatment of another of the waste by-products.
• a supply of unsorted garbage and waste, line 10 is received by the mechanism for processing and such material is first fed into a limited size reduction unit 11 (such as a flail mill or slow speed shredder) which will function to break up the containers and liberate the waste. Material is fed in a dry state along line 12 and is subjected to an intensive magnetic field provided by an apparatus 13 (magnet) for separation of metallic materials with the metallic materials being fed through line 16.
• a limited size reduction unit 11 such as a flail mill or slow speed shredder
• the materials are then fed in a dry state onto a separation screen (primary rotary disc screen) 14 which removes dirt, small organic materials, glass, plastic and non-ferrous metal particles, wherein the separated small particles are fed out at line 18 and an air knife 15 separates remaining heavies from recovered organic materials and plastics.
• the separated heavies from the air knife are passed along line 19 with the large recovered organic material, textiles and plastics being transported to bulk storage along line 17.
• the small particles of dirt, glass, organic and nonmetallic materials in line 18 are directed down to a second fine rotary disc screen 20 with the fine particles of dirt, glass, plastics and fine organic materials passing along line 24.
• the larger small organic materials and non-ferrous metals are processed through a second air knife 21 for further concentration of organic material along line 22 to a bulk storage area. Other remaining heavies and non-ferrous metals will be rejected in the air knife 21 and will pass along line 23.
• An optional third air knife 25a would 'possibly be used to recover fine organic materials (such as grass clippings and light mulch), lines 19, 24 and 23, which would be transported to bulk storage on line 26 while the heavy concentrated, inorganic materials would be removed from the system along line 25.
• fine organic materials such as grass clippings and light mulch
• Organic materials recovered from lines 17, 22 and optional line 26 will be stored in a dry state at bulk storage 27.
• the dry material is reclaimed and metered along line 28 and delivered into an aqueous medium rotating drum.
• the purpose of the aqueous medium rotating drum 30 and 31 is to reduce the organic materials into a pulp by the combination of a horizontal general flow with a gentle action of water, and heat and mechanical energy to conduct defibration.
• the drum will not reduce or damage non-usable materials such as textiles or plastics.
• the oversize non-usable materials are rejected out of the drum discharge end, line 34, and will be retained in bulk storage before disposal.
• the waste material is wetted to about 15% solids consistency and the material is successivel dropped on a hard surface.
• a very high degree of defibratio is reached at an approximately one meter dropping distance by repeating the operation 200 times or more.
• the rotating drum also operates as a screen and for this purpose, the portion 31 has a portion of the outer shell perforated.
• the first chamber 30 is not perforated so as to enable the materials to be wetted and treated long enough to become fiberized. Consistency in the zone 30 is ke ' pt at about 15% and the drum is slightly inclined to cause the material to move forward, that is, from the left to the right in the schematic drawing.
• the material is diluted to a low consistency and the fiber material washed out through the perforations.
• the reject material which is too strong to disintegrate in the gentle defiberizing process and too large to get through the perforations, is rejected and passed as a solid through a line 34 to bulk storage of large plastics and textiles to be incinerated or landfilled.
• the material which passes out through the perforations of the rotating drum portion 31 will be collected in a holding chest 33 that is connected to a pump 41 to be delivered to a mixing tank 42.
• the mixing tank 42 will mix the defiberated pulp with thickened sewage sludge from line 43, which will be blended into a homogenized anaerobic digester feedstock through a powered impeller within the tank 42.
• the homogenized digester feedstock is pumped into the anaerobic digester 44 by pump 53 along line 54.
• the decomposition of cellulose which makes up the defiberized pulp will result in the generation of methane gas CH. and sludge.
• the methane gas is collected and removed from the digester by line 45 to CO_ scrubbers, dehydration and compression.

Landscapes

• Processing Of Solid Wastes (AREA)

Priority Applications (2)

Applications Claiming Priority (2)

Publications (1)

Family

ID=22378122

Family Applications (1)

Country Status (7)

Cited By (2)

Families Citing this family (23)

Citations (4)

Family Cites Families (9)

• 1987
  • 1987-11-06 US US07/118,365 patent/US4846975A/en not_active Expired - Fee Related
• 1988
  • 1988-10-11 AU AU29067/89A patent/AU2906789A/en not_active Abandoned
  • 1988-10-11 KR KR1019890701269A patent/KR950012672B1/ko not_active Expired - Fee Related
  • 1988-10-11 WO PCT/US1988/003467 patent/WO1989004212A1/en not_active Ceased
  • 1988-10-19 CA CA 580612 patent/CA1328932C/en not_active Expired - Fee Related
  • 1988-11-04 IN IN924/CAL/88A patent/IN170792B/en unknown
  • 1988-11-04 NZ NZ22684988A patent/NZ226849A/xx unknown

Patent Citations (4)

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