FR2487222A1 - Anaerobic digester with pumped recycling mixing system - pref. re-injects surface crust bacteria into digester base to accelerate fermentation - Google Patents

Anaerobic digester with pumped recycling mixing system - pref. re-injects surface crust bacteria into digester base to accelerate fermentation Download PDF

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Publication number
FR2487222A1
FR2487222A1 FR8016251A FR8016251A FR2487222A1 FR 2487222 A1 FR2487222 A1 FR 2487222A1 FR 8016251 A FR8016251 A FR 8016251A FR 8016251 A FR8016251 A FR 8016251A FR 2487222 A1 FR2487222 A1 FR 2487222A1
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digester
vessel
pref
vortex
base
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FR8016251A
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French (fr)
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Priority to FR8016251A priority Critical patent/FR2487222A1/en
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/28—Anaerobic digestion processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04C—APPARATUS USING FREE VORTEX FLOW, e.g. CYCLONES
    • B04C7/00—Apparatus not provided for in group B04C1/00, B04C3/00, or B04C5/00; Multiple arrangements not provided for in one of the groups B04C1/00, B04C3/00, or B04C5/00; Combinations of apparatus covered by two or more of the groups B04C1/00, B04C3/00, or B04C5/00
    • 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
    • C12M21/00—Bioreactors or fermenters specially adapted for specific uses
    • C12M21/04—Bioreactors or fermenters specially adapted for specific uses for producing gas, e.g. biogas
    • 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
    • C12M27/00—Means for mixing, agitating or circulating fluids in the vessel
    • 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
    • C12M29/00—Means for introduction, extraction or recirculation of materials, e.g. pumps
    • C12M29/18—External loop; Means for reintroduction of fermented biomass or liquid percolate

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Organic Chemistry (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Bioinformatics & Cheminformatics (AREA)
  • Microbiology (AREA)
  • Genetics & Genomics (AREA)
  • Sustainable Development (AREA)
  • General Engineering & Computer Science (AREA)
  • Biomedical Technology (AREA)
  • General Health & Medical Sciences (AREA)
  • Biotechnology (AREA)
  • Biochemistry (AREA)
  • Molecular Biology (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • General Chemical & Material Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Apparatus Associated With Microorganisms And Enzymes (AREA)

Abstract

The mixer comprises a pumping circuit which recycles material from the top surface of the fermentation and reinjects it at the base of the vessel. The pump suction pipe inlet is below the centre of the natural surface level inside the vessel so that a vortex depression is formed when pumping commences. Pref. reinjection into a vertical cylindrical vessel takes place horizontally at right angles to a radial space pipe. Parallel inflow jets combine to rotate the material about the vertical axis of the vessel and thus accentuate the vortex effect produced above the suction pipe inlet. The vortex swirling action of the sludge prevents surface crust formation and ensures homogenity. As reaction is speeded up, smaller appts. can be used, which is esp. helpful for fermenting agricultural/food waste with a high percentage of dry matter.

Description

;hOCEDE D ACCEWRATION DE FERMENTATION ANAEPBIE EN CONTINU EVIT1T TOUTE FDRMhTIONTDE CROTTE t
L'invention actuelle concerne un-procédé de brassage des matières contenues dans un digesteur anaérobie afin de réduire le délai de rétention et d1évi- ter toute formation de croute résultant de la fermentation.; CONCEPT OF CONTINUOUS ANAEPBIA FERMENTATION ACCEWRATION EVIT1T ANY FDRMhTIONT OF CROTTE t
The present invention relates to a process for brewing the materials contained in an anaerobic digester in order to reduce the retention time and avoid any crust formation resulting from fermentation.

Le brassage des matières contenues dans les digesteurs n'a été effectué jusqu' ici qu'aux fins d'éviter ou de réduire toute formation de croute. En effet, dans toute fermentation en continu il est nécessaire de travailler avec de forts pourcentages d'humidité, 88,90, 94 %. Le faiBle pourcentage de matières sèches contenu par ces fluides a tendance a venir s'agglomérer en surface sous l'effet de la flotaison, et forme a ce moment la une croute très compacte pouvant atteindre plusieurs mètres de hauteur.The mixing of the materials contained in the digesters has so far been carried out only in order to avoid or reduce any crust formation. Indeed, in any continuous fermentation it is necessary to work with high percentages of humidity, 88.90, 94%. The low percentage of dry matter contained by these fluids tends to agglomerate on the surface under the effect of floating, and at this time forms a very compact crust that can reach several meters in height.

Cette çroute représente donc un des inconvénients essentiel de tout procédé de fermentation anaérobie en continu, Diverses techniques sont actuellement utilisées afin d'éviter cette formation de croute.This route therefore represents one of the essential drawbacks of any continuous anaerobic fermentation process. Various techniques are currently used to avoid this crust formation.

La station d'Achères utilise notamment l'insufflation du gaz produit par la fermentation, sous pression, à la base du digesteur. Les bulles de gaz remontant viennent alors assurer le brassage de la matière tout envenant crever la surface, empêchant ainsi la formation de croute. Il est a noter que les boues résiduaires de la station d'Achères excèdent rarement 8% de matieres sèches
D'autres utilisatiires, a une echelle nettement moins importante, utilisent n4 soit le brassage par vis sans fin avec prise de la matière au fond du digesteur et arrosage en surface ; soit, toujours a une échelle moins importante, en utilisant des bras de brassage en surface, assurant par rotation la non formation de croute.The Achères station uses in particular the insufflation of the gas produced by fermentation, under pressure, at the base of the digester. The rising gas bubbles then come to ensure the mixing of the material while coming to burst the surface, thus preventing the formation of crust. It should be noted that the residual sludge from the Achères station rarely exceeds 8% of dry matter
Other users, on a much smaller scale, use n4, namely worm screw mixing with the material taken at the bottom of the digester and surface watering; or, always on a smaller scale, using surface stirring arms, ensuring by rotation the formation of crust.

Une autre technique consiste a brasser l'ensemble de la matière dans des digesteurs de forme longitudinale.Another technique consists in brewing all the material in digesters of longitudinal shape.

Il résulte de toutes ces techniques, une non formation de croute, et l'on peut se rendre compte que lorsqu'il s'agit de digesteurs très importants de type
Achères, il est impossible de pouvoir utiliser un brassage mécanique. En effet la dimension des cuves interdit d'elle même ce genre de procédé qu'il soit par bras ou par vis sans fin. tes efforts demandés a la mécanique ne seraient pas supportables.It results from all these techniques, a non crust formation, and one can realize that when it comes to very important digesters of the type
Achères, it is impossible to be able to use mechanical mixing. Indeed the size of the tanks itself prohibits this kind of process whether by arm or worm. your efforts required mechanics would not be bearable.

Si l'on désire exploiter les déchets agro-aldimentaires a une glande échelle, on s'aperçoit rapidement qu'il est indispensable de travailler avec de gros digesteurs compte tenu des déchets disponibles sur un très court rayon.If you want to exploit agro-food waste on a large scale, you quickly realize that it is essential to work with large digesters given the waste available on a very short radius.

Pour des raisons de transport, et du fait de la qualité des résidus actuels on est amené a augmenter très sensiblement le pourcentage des matières sèches, ce qui interdit donc l'utilisation du procédé d'insufflation de gaz, ainsi que tout brassage mécanique.For transport reasons, and due to the quality of the current residues, it is necessary to very significantly increase the percentage of dry matter, which therefore prohibits the use of the gas blowing process, as well as any mechanical mixing.

Afin d'éviter la construction de monstrueux digesteurs il devient donc nécessaire d'accélérer le processus de fermentation. Hors les colonies de bactéries assurant la fermentation des matières vivent agglomérées autour des parr ticules de matières carbonées remontant a la surface.In order to avoid the construction of monstrous digesters it therefore becomes necessary to speed up the fermentation process. Outside the colonies of bacteria ensuring the fermentation of the materials live agglomerated around the particles of carbonaceous materials rising to the surface.

L'invention actuelle vise donc 10 - a accélérer le processus de fermentation par reprise en surface des matières sèches et des bactéries agglomérées autour de ces dernières, et leur réiniection a la base du digesteur, ce qui aura pour effet de réactiver ces bactéries et de permettre une meilleure fermentation de la matière, donc de réduire le délai de rétention 2 - le fait d'aspirer la matière â un nivean inférieur au niveau de la matière contsnue dans le digesteur créera un effet vortex qui sera amplifié par la rotation de la nasse en digestion ; cette rotation étant elle-meme obtenue par réinjection de la matière à la base du di- gesteur parallèlement aux parois avec un effet de lames ; l'ensemble de l'aspiration et de la réinjection étant assuré par pompage (pompes à gros débit).The present invention therefore aims 10 - to accelerate the fermentation process by resumption on the surface of dry matter and bacteria agglomerated around the latter, and their reinection at the base of the digester, which will have the effect of reactivating these bacteria and allow a better fermentation of the material, therefore reducing the retention time 2 - sucking the material at a level below the level of the material contained in the digester will create a vortex effect which will be amplified by the rotation of the basket in digestion; this rotation being itself obtained by reinjection of the material at the base of the digester parallel to the walls with a blade effect; all suction and reinjection being provided by pumping (high flow pumps).

L'ensemble de ce procédé permet de plus une tonne homogeneisation de la matière évitant toute stratification. The whole of this process also allows a ton of homogenization of the material avoiding any stratification.

Claims (1)

REVENDICATIONS le Brasseur de matières contenues dans un digesteur anaérobie en continu et présentant un fort pourcentage de matières sèches caractérisé par l'aspiration en-dessous du niveau naturel du fluide afin de créer un effet vortex, le tout effectué par pompage de façon à annuler toute formation de croute.CLAIMS the Brewer of materials contained in a continuous anaerobic digester and having a high percentage of dry materials characterized by the suction below the natural level of the fluid in order to create a vortex effect, all done by pumping so as to cancel any crust formation. 20 Réinjection de la matière sous pression à la base du digesteur caractérisé par l'effet de lames parallèlement à la paroi afin de donner un mouvement circulaire & la matière, accentuant ainsi l'effet vortex de la revenu dication I 20 Reinjection of the pressurized material at the base of the digester characterized by the effect of blades parallel to the wall in order to give a circular movement to the material, thus accentuating the vortex effect of the dication income I
FR8016251A 1980-07-23 1980-07-23 Anaerobic digester with pumped recycling mixing system - pref. re-injects surface crust bacteria into digester base to accelerate fermentation Withdrawn FR2487222A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR8016251A FR2487222A1 (en) 1980-07-23 1980-07-23 Anaerobic digester with pumped recycling mixing system - pref. re-injects surface crust bacteria into digester base to accelerate fermentation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR8016251A FR2487222A1 (en) 1980-07-23 1980-07-23 Anaerobic digester with pumped recycling mixing system - pref. re-injects surface crust bacteria into digester base to accelerate fermentation

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FR2487222A1 true FR2487222A1 (en) 1982-01-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2004534C2 (en) * 2010-04-12 2011-10-13 Colsen Homogeneity device for a tank, use thereof and assembly of a tank and said device.
CN106732259A (en) * 2016-12-13 2017-05-31 衡阳华砷科技有限公司 A kind of stirring means of reaction vessel

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR648151A (en) * 1927-03-12 1928-12-06 Waldhof Zellstoff Fab Method and device for obtaining yeasts
CH277324A (en) * 1949-06-21 1951-08-31 Schmidt Ferdinand Method and device for the destruction of floating sludge layers in septic tanks.
FR1064614A (en) * 1949-06-21 1954-05-17 Method and device for the production of methane gas, in rural septic installations in particular
US2772233A (en) * 1954-07-26 1956-11-27 Dorr Oliver Inc Anaerobic digestion tanks with digesting mechanism
US3078999A (en) * 1959-06-18 1963-02-26 Earl M Kelly Sludge digester

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR648151A (en) * 1927-03-12 1928-12-06 Waldhof Zellstoff Fab Method and device for obtaining yeasts
CH277324A (en) * 1949-06-21 1951-08-31 Schmidt Ferdinand Method and device for the destruction of floating sludge layers in septic tanks.
FR1064614A (en) * 1949-06-21 1954-05-17 Method and device for the production of methane gas, in rural septic installations in particular
US2772233A (en) * 1954-07-26 1956-11-27 Dorr Oliver Inc Anaerobic digestion tanks with digesting mechanism
US3078999A (en) * 1959-06-18 1963-02-26 Earl M Kelly Sludge digester

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2004534C2 (en) * 2010-04-12 2011-10-13 Colsen Homogeneity device for a tank, use thereof and assembly of a tank and said device.
CN106732259A (en) * 2016-12-13 2017-05-31 衡阳华砷科技有限公司 A kind of stirring means of reaction vessel

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