US3707774A - Method for the drying of high-moisture waste products of living organisms - Google Patents

Method for the drying of high-moisture waste products of living organisms Download PDF

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Publication number
US3707774A
US3707774A US00118529A US3707774DA US3707774A US 3707774 A US3707774 A US 3707774A US 00118529 A US00118529 A US 00118529A US 3707774D A US3707774D A US 3707774DA US 3707774 A US3707774 A US 3707774A
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US
United States
Prior art keywords
drying
drier
products
waste products
particles
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US00118529A
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English (en)
Inventor
E Eise
H Hefermehl
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Buehler AG
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Buehler AG
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    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F3/00—Fertilisers from human or animal excrements, e.g. manure
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F1/00—Fertilisers made from animal corpses, or parts thereof
    • C05F1/005—Fertilisers made from animal corpses, or parts thereof from meat-wastes or from other wastes of animal origin, e.g. skins, hair, hoofs, feathers, blood
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B7/00—Drying solid materials or objects by processes using a combination of processes not covered by a single one of groups F26B3/00 and F26B5/00
    • 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
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/20—Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
    • 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

Definitions

  • the present invention concerns a method for the drying of high-moisture waste products of living organisms.
  • Another known method consists in drying waste products 'of living organisms in non-continuous drying tanks with hot air.
  • the intermittent procedure involves much labor, and heat consumption is high.
  • a .known system uses a drumvdrier. Heat consumption is high, and unduly long contact with the hot drier surfaces often results in the overheating or even burning of a considerable quantity of the product, with adverse effects on the quality of the final product.
  • yet another known method consists in first causing the liquid to evaporate, but this requires a rather large tank with considerable ancillary apparatus. Also, the large quantity of air involved gives rise to problems of odor, which again require a large air cleansing and washing system.
  • the present invention permits dried products of good quality to be obtained at relatively low heat and system costs.
  • the method claimed hereunder is characterized in that the waste products are treated in a continuous dehydration press and immediately thereafter dried in a pneumatic conveying drier.
  • the sole FIGURE is a flow diagram showing an embodiment of the process of the present invention.
  • the first treatment of the products is in the continuous dehydration press which squeezes out much water, which then need not be evaporated. This reduces the heat requirementand the quantity of the drying air to be cleaned.
  • the system required for the application of the method needs little space and does not cause any problems due to intermediate storage of the products between dehydration press and drier. Drying is very rapid because the air movement is vigorous and the particles are completely enveloped by the drying air. As a result, the surface of the particles consolidates very rapidly, thus reducing the risk of a large number of overheated or burnt particles getting stuck to the drier wall and burning up.
  • the method is also suitable for exceptionally difficult products, provided that these, immediately after treatment in the continuous dehydration press, are mechanically broken up and fed into the pneumatic conveying drier.
  • breaking-up which can be effected by relatively simple mechanical means, the products, which are often extruded from the dehydration press in the form of a paste, are commutated and reduced to a form suitable for pneumatic conveying drying.
  • drying will be especially uniform.
  • the velocity of the drying air is lower, and the particles cannot be entrained from the container of the drier before their weight has been reduced through sufficient drying.
  • the economic side will be improved yet further if the drying and conveying air circulates in a closed circuit, so that, after separation of the dried product, part of the air passes into the cleaning system, while the other part, with fresh air added, is re-heated.
  • An example of the application of the method concerns solids mechanically separated (as by strainers) from stale.
  • the stale is pumped from the stale pit, and the solids are separated by a strainer or a centrifuge.
  • the solids having an initial moisture of to percent of the wet weight, are processed by the dehydration press, having the form of a screw, to a moisture content of 40 to 50 percent of the wet weight and are then treated in the pneumatic conveying drier with drying air of 200C until their moisture content is about 15 percent.
  • the resultant product can be used as manure.
  • the drying air should have a temperature of at least C.
  • the moisture content can range from 8 to 20 percent
  • stockyard waste which may also include non-utilizable carcasses
  • the product can further be fine-ground, and liquid fatty components separated in centrifuges.
  • the remaining product hav' ing a moisture of 50 to 60 percent and a temperature of about 80C, passes into the dehydration press, which squeezes out further parts of fat.
  • the product having a moisture of about 40 percent, passes into the pneumatic conveying drier, which treats it with air of 300 to 400C.
  • the product delivered by the drier has a moisture content of about 8 percent and constitutes a very valuable feed.
  • a method for the drying of high-moisture waste products of living organisms having a moisture content on the order of about 80-90 percent comprising continuously pressing said waste products to a moisture content of about 40-50 percent, continuously mechanically breaking into particles said waste product from said pressing operation, continuously passing said particles into a pneumatic conveying drier and therein simultaneously drying said particles to a moisture content between 8 and 20 percent and conveying said particles upwardly and finally out of said drier on a stream of drying air heated to at least C.
  • a method in accordance with claim 1 comprising effecting said drying of said particles to a moisture content of about 15 percent.
  • waste products comprise stockyard waste.
  • waste products further comprise solids obtained from a sewage treatment system.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)
  • Drying Of Solid Materials (AREA)
  • Fertilizers (AREA)
US00118529A 1970-03-03 1971-02-24 Method for the drying of high-moisture waste products of living organisms Expired - Lifetime US3707774A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH305870A CH520633A (de) 1970-03-03 1970-03-03 Verfahren zur Trocknung von hochfeuchten Abfallprodukten von Lebewesen

Publications (1)

Publication Number Publication Date
US3707774A true US3707774A (en) 1973-01-02

Family

ID=4247662

Family Applications (1)

Application Number Title Priority Date Filing Date
US00118529A Expired - Lifetime US3707774A (en) 1970-03-03 1971-02-24 Method for the drying of high-moisture waste products of living organisms

Country Status (11)

Country Link
US (1) US3707774A (de)
AT (1) AT302384B (de)
BE (1) BE763655A (de)
CA (1) CA930542A (de)
CH (1) CH520633A (de)
DE (1) DE2108426A1 (de)
DK (1) DK133203C (de)
ES (1) ES388712A1 (de)
FR (1) FR2083952A5 (de)
NL (1) NL7102569A (de)
SE (1) SE366288B (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4657682A (en) * 1984-06-11 1987-04-14 Nippon Kokan Kabushiki Kaisha Method for dehydrating sludge
US4761893A (en) * 1986-10-29 1988-08-09 Glorioso John D Sludge treatment process
US4761895A (en) * 1983-12-01 1988-08-09 Nippon Kokan Kabushiki Kaisha Method and apparatus for dehydrating sludge
US4768292A (en) * 1985-05-22 1988-09-06 Sevar Entsorgungsanlagen Gmbh Method and apparatus for drying sewage sludge
US4829678A (en) * 1986-10-29 1989-05-16 Enviro Gro Technologies Sludge treatment process
US4860671A (en) * 1986-10-29 1989-08-29 Enviro-Gro Technologies, Inc. Odor control for a sludge treatment process
US4953478A (en) * 1986-10-29 1990-09-04 Enviro-Gro Technologies Odor control for a sludge treatment process
WO1991006816A1 (en) * 1989-10-26 1991-05-16 Akt Consultants Pty Limited Transportable flow drying plant
AU620598B2 (en) * 1988-08-04 1992-02-20 Enviro-Gro Technologies Improved particulate removal for sludge treatment process
US5309849A (en) * 1992-05-22 1994-05-10 Andritz Tcw Engineering Gmbh Sludge drying system with recycling exhaust air
US5318184A (en) * 1992-09-10 1994-06-07 Georg Krebs Sludge drying system
USRE35251E (en) * 1989-08-17 1996-05-28 Van Den Broek; Jos Sewage sludge treatment system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2006414B (en) * 1977-10-22 1982-05-12 Braunschweigische Masch Bau Process and apparatus for drying pasty aqueous sludges
DE3826247A1 (de) * 1988-08-02 1990-02-15 Dietrich Dr Thiele Verfahren zur aufarbeitung fluessiger tierischer exkremente und danach erhaltenes streufaehiges duengemittel
ES2036949B1 (es) * 1991-11-21 1994-02-01 Tioxide Europ Corrector de carencias de microelementos a base de sulfato de magnesio y hierro para suelos agricolas y procedimiento para su preparacion.

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1321006A (en) * 1919-11-04 brockhausen
US1797335A (en) * 1927-02-12 1931-03-24 John H Fedeler Apparatus for treating organic material
US2023247A (en) * 1932-12-29 1935-12-03 Raymond Brothers Impact Pulver Mill-drying process and apparatus
US2089978A (en) * 1934-11-06 1937-08-17 Josephus A Mcnatt Machine for making fertilizer from garbage
US2365890A (en) * 1942-10-05 1944-12-26 Douglas M Mcbean Method of food dehydration
US2783544A (en) * 1953-08-22 1957-03-05 Buttner Werke Ag Process and apparatus for the drying of damp material in current driers
US3100143A (en) * 1959-07-15 1963-08-06 John A Manning Paper Company I Process of drying mucilaginous plant materials

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1321006A (en) * 1919-11-04 brockhausen
US1797335A (en) * 1927-02-12 1931-03-24 John H Fedeler Apparatus for treating organic material
US2023247A (en) * 1932-12-29 1935-12-03 Raymond Brothers Impact Pulver Mill-drying process and apparatus
US2089978A (en) * 1934-11-06 1937-08-17 Josephus A Mcnatt Machine for making fertilizer from garbage
US2365890A (en) * 1942-10-05 1944-12-26 Douglas M Mcbean Method of food dehydration
US2783544A (en) * 1953-08-22 1957-03-05 Buttner Werke Ag Process and apparatus for the drying of damp material in current driers
US3100143A (en) * 1959-07-15 1963-08-06 John A Manning Paper Company I Process of drying mucilaginous plant materials

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4761895A (en) * 1983-12-01 1988-08-09 Nippon Kokan Kabushiki Kaisha Method and apparatus for dehydrating sludge
US4657682A (en) * 1984-06-11 1987-04-14 Nippon Kokan Kabushiki Kaisha Method for dehydrating sludge
US4986910A (en) * 1984-06-11 1991-01-22 Nippon Kokan Kabushiki Kaisha Apparatus for dehydrating sludge
US4768292A (en) * 1985-05-22 1988-09-06 Sevar Entsorgungsanlagen Gmbh Method and apparatus for drying sewage sludge
US4953478A (en) * 1986-10-29 1990-09-04 Enviro-Gro Technologies Odor control for a sludge treatment process
US4860671A (en) * 1986-10-29 1989-08-29 Enviro-Gro Technologies, Inc. Odor control for a sludge treatment process
US4829678A (en) * 1986-10-29 1989-05-16 Enviro Gro Technologies Sludge treatment process
US4761893A (en) * 1986-10-29 1988-08-09 Glorioso John D Sludge treatment process
AU620598B2 (en) * 1988-08-04 1992-02-20 Enviro-Gro Technologies Improved particulate removal for sludge treatment process
USRE35251E (en) * 1989-08-17 1996-05-28 Van Den Broek; Jos Sewage sludge treatment system
WO1991006816A1 (en) * 1989-10-26 1991-05-16 Akt Consultants Pty Limited Transportable flow drying plant
US5309849A (en) * 1992-05-22 1994-05-10 Andritz Tcw Engineering Gmbh Sludge drying system with recycling exhaust air
US5318184A (en) * 1992-09-10 1994-06-07 Georg Krebs Sludge drying system

Also Published As

Publication number Publication date
DE2108426A1 (de) 1971-09-23
NL7102569A (de) 1971-09-07
ES388712A1 (es) 1973-05-16
FR2083952A5 (de) 1971-12-17
CA930542A (en) 1973-07-24
DK133203B (da) 1976-04-05
BE763655A (fr) 1971-08-02
CH520633A (de) 1972-03-31
DK133203C (da) 1976-09-13
AT302384B (de) 1972-10-10
SE366288B (de) 1974-04-22

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