EP1778603A1 - Procede et dispositif pour deshydrater des residus de fermentation - Google Patents

Procede et dispositif pour deshydrater des residus de fermentation

Info

Publication number
EP1778603A1
EP1778603A1 EP05737693A EP05737693A EP1778603A1 EP 1778603 A1 EP1778603 A1 EP 1778603A1 EP 05737693 A EP05737693 A EP 05737693A EP 05737693 A EP05737693 A EP 05737693A EP 1778603 A1 EP1778603 A1 EP 1778603A1
Authority
EP
European Patent Office
Prior art keywords
press water
star
machine
disc
sieve
Prior art date
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.)
Withdrawn
Application number
EP05737693A
Other languages
German (de)
English (en)
Inventor
Daniel Kern
Markus Roth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Walter Schmid AG
Original Assignee
Walter Schmid AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Walter Schmid AG filed Critical Walter Schmid AG
Publication of EP1778603A1 publication Critical patent/EP1778603A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D33/00—Filters with filtering elements which move during the filtering operation
    • B01D33/27—Filters with filtering elements which move during the filtering operation with rotary filtering surfaces, which are neither cylindrical nor planar, e.g. helical surfaces
    • B01D33/275—Filters with filtering elements which move during the filtering operation with rotary filtering surfaces, which are neither cylindrical nor planar, e.g. helical surfaces using contiguous impervious surfaces
    • 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
    • C05F17/40—Treatment of liquids or slurries
    • 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
    • C05F17/50—Treatments combining two or more different biological or biochemical treatments, e.g. anaerobic and aerobic treatment or vermicomposting and aerobic treatment
    • 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
    • C05F17/986—Constructional parts, e.g. floors, covers or doors for feeding or discharging materials to be treated; for feeding or discharging other material the other material being liquid
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M47/00—Means for after-treatment of the produced biomass or of the fermentation or metabolic products, e.g. storage of biomass
    • C12M47/10—Separation or concentration of fermentation products
    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
    • C12M47/00—Means for after-treatment of the produced biomass or of the fermentation or metabolic products, e.g. storage of biomass
    • C12M47/14—Drying
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
    • 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 present invention relates to a method for dewatering fermentation residue originating from a fermenter.
  • the invention also relates to a plant for fermenting biogenic waste materials, which comprises at least one fermenter and a subsequent dewatering device.
  • the applicant has developed biogas and fermentation products and has successfully operated and sold them for years.
  • the fermenter is charged with the organic material to be fermented and depending on the consistency and
  • Water content moistened with excess press water among other things.
  • the optimal water content is advantageously monitored and regulated in addition to other process parameters.
  • the material is conveyed through the fermenter and leaves it in the fermented state as fermentation residue.
  • the dry matter Proportion of the digestate can be between approx. 15 and 35%, typically between 22 and 27%.
  • the fermentation residue is emptied at the rear end with respect to the flow direction of the fermenter and passed through a dewatering stage. In such dewatering stages, a large part of the water is extracted from the digestate.
  • dewatered digestate is suitable for aerobic post-rotting, which usually follows the anaerobic fermentation in the fermenter in order to obtain high-quality compost material. So that the post-rotting actually takes place aerobically, the dewatered digestate must not be too moist, nor must it be too densely compressed.
  • the proportion of liquid that is extracted from the fermentation residue in the dewatering stage is generally referred to as press water, regardless of whether the liquid was actually separated from the fermentation residue by active pressing or by other forces such as passive dripping or centrifugal forces.
  • Figure 1 is a partial view of the system according to the invention in a top view.
  • Figure 2 shows a system according to the invention in a vertical section
  • Figure 3 shows a perspective view of an embodiment of a star or disc screening machine.
  • the system according to the invention is first described below, and then the method is discussed.
  • the plant is shown in plan view in FIG. 1 and in a vertical partial section in FIG.
  • the heart of the plant is the fermenter 1.
  • the fermenter 1 is fed with biogenic waste, such as green waste, garden waste or biogenic commercial waste.
  • the biogenic waste materials are in a storage bunker 2.
  • the biogenic waste materials are reduced by means of a reduction device 3.
  • the reduction device 3 may be a shredder or a hammer mill or another known form of reduction machine.
  • the comminuted biogenic waste materials reach a mixer 5 via a conveyor unit 4. Via a feed line 6, the biogenic waste materials arrive at the inlet side of the fermenter 1, which is preferably operated using the graft stream process.
  • Fermented, bacterially loaded digestate can be fed back into the feed line 6 via a feedback line 7 with a solid pump arranged therein but not shown.
  • additional press water from a press water basin 11 can also be fed to the mixer 5 and optionally also to the fermenter 1 via a line L by means of a pump P.
  • the main flow of the fermented fermentation residue reaches the dewatering device 10 via a conveying element 8.
  • the conveying element 8 can, as in the example shown here, be realized as a screw conveyor with a screw conveyor 9, or can also be replaced by a solids pump. This is possible because the anaerobic fermentation is complete from the outlet of the fermenter 1 and the aerobic decomposition now follows.
  • the fermentation residue reaches the dewatering device 10 from the conveying element 8, which here is designed according to the invention as a star or disc sieve machine 100.
  • the star or disc sieve machine 100 is used in combination to convey the digestate to the post-rotting pile 20 and to drain the digestate.
  • the dewatering device 10 is held above the press water basin 11 by means of supports 111.
  • the press water 21 released on the screen section between the conveying element 8 and the post-rotting pile 20 reaches the press water basin 11 arranged under the dewatering device 10.
  • a floating layer 22 forms on the press water 21.
  • the press water basin 11 can be divided into sub-basins by additional partition walls.
  • a subdivided press water basin 11 there is the possibility of moving the star or disc sieve machine 100, so that a sub-basin is alternately filled while another sub-basin is at rest, so that the floating layer 22 can develop more distinctly and, if necessary, also compress and dry. This floating layer is then removed and added to the post-rotting pile 20.
  • the press water basin 11 can also be divided into three or more sub-basins if this proves to be advantageous for the process sequence.
  • the conveyor element 8 can also be adapted in position and length.
  • FIG. 3 shows an embodiment of a star or disk sieve machine 100 on a larger scale in perspective view alone.
  • the star or disc sieve machine 100 has a sieve bed frame 101, which essentially consists of two side members and at least two cross members.
  • Shafts 103 are mounted in bearings 102 between the longitudinal beams of the screen bed frame 101.
  • Rollers 104 are fastened to the shafts 103 and are alternately coupled on both sides of the two longitudinal beams via drive belts 105.
  • the drive takes place via at least one drive motor 108 or, as shown here, via two drive motors operated synchronously with one another.
  • the rollers 104, the drive belts 105 and the bearings 102 are secured against contamination by a roller box cover 109.
  • Centrifugal disks 106 are arranged on the driven shafts 103 in a rotationally fixed manner.
  • the centrifugal discs 106 are offset relative to one another, so that the centrifugal discs of a shaft 103 can intervene between the centrifugal discs of an adjacent shaft.
  • star or disc sieve machines are used in various technical areas to separate materials of different sizes, as the name sieve machine implies. The use of such machines to dewater digestate was previously unknown. Of particular interest here is the fact that, in contrast to other dewatering devices known to date, the fermentation residue is not compressed, which means that the subsequent aerobic rotting can be carried out optimally.
  • star or disc sieve machine is derived from the discs 106 arranged in the sieve bed. These disks 106 can have virtually any shape. If the disks are circular, very fine particles can be accelerated, while the actual conveying effect of the digestate is relatively low. However, if the disks 106 are serrated and therefore have a star shape, the conveying capacity is increased in particular. With regard to the configuration of such star-shaped centrifugal discs, reference can be made, for example, to EP-A-1 '088' 599. In addition to the shape of the centrifugal disks 106, the density of the arrangement thereof is of course also important for the drainage performance. The choice of shape and size as well as the spacing of the centrifugal discs can be optimized accordingly.
  • the optimization cannot be determined in general, since this is of course extremely dependent on the starting product from which the fermentation residue emerging from the fermenter 10 is composed. Since, as already mentioned, the shape of the centrifugal disks 106 also influences the conveying action of the digestate, it is also possible, for example, to arrange the inclination of the entire screen bed frame 101 above the press water basin 11. In this way, the delivery rate can be influenced without the centrifugal disks 106 having to be replaced.
  • centrifugal disks 106 Materials which are particularly effective in experiments can also be found in relation to the materials of the centrifugal disks 106.
  • the possibility of providing the centrifugal disks 106 with finger-shaped teeth is contemplated and to manufacture them from a rubber-elastic material in order to reduce the inevitable crushing effect of the digestate.
  • Floating layer 22 is larger and denser, with a certain incrustation being determined at the same time. Accordingly, the floating layer 22 can easily be skimmed off after a certain time by means of a gripper. The remaining press water 21 naturally still has a certain proportion of solids which remain in suspension.
  • press water 21 can be returned to the mixer 5 or the fermenter 1 without an accumulation of the very fine solids being determined becomes.
  • the press water 21, however, has a higher solids content than press water from plants in which the press water has been post-treated. For agriculture, however, this is no problem.
  • the skimmed floating layer 22 can be fed to the post-rotting 20 and forms a high-quality compost.
  • the press water basin 11 can be divided into partial basins which are successively filled first, then left in peace and finally the floating layer can be skimmed off.
  • the influence can also be influenced by other variable parameters.
  • Such parameters represent on the one hand the rotational speed of the shafts 103 and on the other hand the conveying speed of the fermentation residue on the star or disc sieve machine.
  • the rotational speed of the shafts 103 in the simplest case it is possible to run all shafts uniformly at a higher rotational speed.
  • groups of shafts can also be driven in successive sectors of the sieve bed with different rotational speeds.
  • Another option is to alternatively drive one wave faster and the adjacent wave slower. This can be done by driving every second shaft at one speed from one side and the other shafts at a different speed from the other side of the sieve bed frame. The corresponding effect can be determined experimentally.
  • the inclination of the sieve bed frame 101 can also be arranged so as to be adjustable in its inclination in the conveying direction above the press water basin 11, as a result of which the conveying capacity can be influenced accordingly. This results in a longer dwell time for the digestate on the sieve bed of the machine.

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  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Biochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Microbiology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Molecular Biology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biomedical Technology (AREA)
  • General Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Genetics & Genomics (AREA)
  • Sustainable Development (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

Selon la présente invention, le résidu produit par un fermenteur (1) arrive à un dispositif de déshydratation (10) via un organe de transport (8). Ce dispositif de déshydratation (10) est conçu sous forme de machine de tamisage en étoile ou en disque (100). Cette machine de tamisage est montée au-dessus d'un bac d'eau de presse (11) dans lequel l'eau de presse obtenue (21) est recueillie. Une couche flottante (22) se forme au-dessus de l'eau de presse (21). Après un temps de repos donné, cette couche flottante est prélevée, puis transférée à un système post-fermentation (20). Ce procédé de déshydratation est extrêmement simple, rentable et résistant et permet de mieux maîtriser l'ensemble du processus de fermentation, réduisant nettement la dépendance des proportions de matières solides extra-fines lors du retour de l'eau de presse dans le processus de fermentation, ainsi que la nécessité de broyer la matière d'entrée.
EP05737693A 2004-06-14 2005-05-17 Procede et dispositif pour deshydrater des residus de fermentation Withdrawn EP1778603A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
CH9932004 2004-06-14
CH10592004 2004-06-23
PCT/CH2005/000273 WO2005121052A1 (fr) 2004-06-14 2005-05-17 Procede et dispositif pour deshydrater des residus de fermentation

Publications (1)

Publication Number Publication Date
EP1778603A1 true EP1778603A1 (fr) 2007-05-02

Family

ID=34982263

Family Applications (1)

Application Number Title Priority Date Filing Date
EP05737693A Withdrawn EP1778603A1 (fr) 2004-06-14 2005-05-17 Procede et dispositif pour deshydrater des residus de fermentation

Country Status (2)

Country Link
EP (1) EP1778603A1 (fr)
WO (1) WO2005121052A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007008188A1 (de) * 2007-02-12 2008-08-28 Linke, Torsten Bodensubstrat aus kompostierten Fäkalien und Verfahren zu dessen Herstellung
GB2496599A (en) * 2011-08-26 2013-05-22 Tha Ni Ind E Gmbh Two tank fermentation system and method of operation

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH673958A5 (en) * 1987-09-22 1990-04-30 Asper & Co Ag Solids sepg. appts. - with revolving parallel shafts carrying polygonal intermeshing plates
GB2235392A (en) * 1989-08-25 1991-03-06 Mono Pumps Ltd Screening device
GB2259459A (en) * 1991-09-11 1993-03-17 Peter George Nicholls Fine screen for sewage
FI102042B1 (fi) * 1997-01-09 1998-10-15 Meiko Oy Suodatinlaite
DE59808484D1 (de) * 1998-12-21 2003-06-26 Walter Schmid Ag Glattbrugg Entwässerung von Fermentationsprodukten mit Schneckenpresse
ES2216766T3 (es) * 1999-07-26 2004-11-01 Walter Schmid Ag Instalacion de fermentacion con un dispositivo para la deshidratacion de productos de fermentacion.
CH697136A5 (de) * 1999-10-26 2008-05-15 Walter Schmid Ag Vergärungsverfahren und Anlage zum Vergären.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO2005121052A1 *

Also Published As

Publication number Publication date
WO2005121052A1 (fr) 2005-12-22

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