Classifications

• • C—CHEMISTRY; METALLURGY
  • C05—FERTILISERS; MANUFACTURE THEREOF
  • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
  • C05F17/00—Preparation of fertilisers characterised by biological or biochemical treatment steps, e.g. composting or fermentation
  • C05F17/90—Apparatus therefor
  • C05F17/964—Constructional parts, e.g. floors, covers or doors
  • C05F17/971—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material
• • 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
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P20/00—Technologies relating to chemical industry
  • Y02P20/141—Feedstock
  • Y02P20/145—Feedstock the feedstock being materials of biological origin
• • 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

Definitions

• the object of the invention is a method for feeding a substance to a continuously operating composter, which is fed intermit- tently and pulsatingly with peat, dung, straw, turf, or other substance which is intended to be decomposed by the aerobic method and which typically leaves the composter after a few days and which is then transferred to a storage and/or further combustion pile.
• the invention is also concerned with a composter using this method.
• the dung or other waste to be treated by the composter is usually in the form of sludge.
• its water content 85...95%) is too great for it to be fed directly to the composter and a substance with a high humus content, such as, for example, peat, is mixed with it.
• the dry matter content of the substance being fed to the composter should be about 25...35%.
• the mixture of peat in particular with sludge is difficult, because due to the great surface tension peat does not naturally absorb sludge but remains floating on the surface of the sludge. They do not necessarily mix when transferred by a feed screw or other known conveyor.
• a continuously operating composter is affected greatly if even a relatively small amount of sludge is fed to it.
• the water contents of the wastes being treated may vary greatly, which creates a continual problem in the feeding of the substance.
• On account of the lack of homogenity in the substance it is difficult to measure the water content reliab- ly, so that it is difficult to apply control automation in this case.
• the intention of this invention is to achieve a new kind of feed method for a substance and equipment, which will remove the danger of substance that is too wet being fed to the composter chamber.
• Patent Claim 1 The characteristic features of the method in accordance with the invention appear in Patent Claim 1 and the characteristics of an advantageous device for realizing the method appear in Patent Claim 3.
• Figure 1 shows the composter seen from the side Figure 2 shows the composter seen from in front Figure 3 shows the substance feed device in detail
• the illustrations show a composter 1 adapted to the maturing of dung on cattle farms.
• the dung is dropped into the feed hopper 6, from which it is transferred along channel 4 to the compos ⁇ ter chamber 8, which is principally formed by a revolving drum in which r after a few days' treatment the dung changes in the known manner into an improved form and is removed by the screw conveyor 3.
• the device shown in Finnish patent publication 75335 can be used for the removal of the substance.
• the feeding of the dung and humus substance to the hopper 6 can take place quite unevenly.
• the hopper 6 includes a pushed chain 11 and crusher rollers 12 by means of which the substance is both broken up and dropped into the feed opening 10 of the piston compressor that is used as a transfer device 7.
• the effective length of stroke of the piston compressor begins after the feed opening 10 and the feed unit is marked with the reference number 5 in the illustration.
• the piston compressor pushes the substance into channel 4, the volume of which is many times greater than that of a single feed unit 5.
• Channel 4 includes a vertical section 9, from which the excess water in the substance flows down. Sludge that is too wet slops back and forwards in the start of channel 4 until sufficient drier substance has been mixed with it.
• Drier substance with a dry matter content of 25...35% adheres to the vertical section and rises stroke by stroke to the hopper of the feed screw 2 of the composter chamber 8.
• the feed screw 2 breaks up the lumps foamed in channel 4 at the same time as it transfers them into the composter chamber 8.

Landscapes

• Chemical & Material Sciences (AREA)
• Chemical Kinetics & Catalysis (AREA)
• Life Sciences & Earth Sciences (AREA)
• Engineering & Computer Science (AREA)
• Biochemistry (AREA)
• Biotechnology (AREA)
• Health & Medical Sciences (AREA)
• General Chemical & Material Sciences (AREA)
• Microbiology (AREA)
• Molecular Biology (AREA)
• Organic Chemistry (AREA)
• Fertilizers (AREA)
• Treatment Of Sludge (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=8525913

Family Applications (1)

Country Status (3)

Cited By (5)

Citations (5)

• 1988
  • 1988-02-15 FI FI880689A patent/FI77641C/sv not_active IP Right Cessation
• 1989
  • 1989-02-14 AU AU30615/89A patent/AU3061589A/en not_active Abandoned
  • 1989-02-14 WO PCT/FI1989/000022 patent/WO1989007585A1/en unknown

Patent Citations (5)

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