WO1997023417A1 - Lipid material biodecomposition device and method - Google Patents

Lipid material biodecomposition device and method Download PDF

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Publication number
WO1997023417A1
WO1997023417A1 PCT/CH1996/000462 CH9600462W WO9723417A1 WO 1997023417 A1 WO1997023417 A1 WO 1997023417A1 CH 9600462 W CH9600462 W CH 9600462W WO 9723417 A1 WO9723417 A1 WO 9723417A1
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Prior art keywords
lipid materials
lipid
carried out
materials
tank
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PCT/CH1996/000462
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French (fr)
Inventor
Frank Lappin Horsfall, Iii
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Coho Laboratories S.A.
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Application filed by Coho Laboratories S.A. filed Critical Coho Laboratories S.A.
Priority to EP96942232A priority Critical patent/EP0810977A1/en
Publication of WO1997023417A1 publication Critical patent/WO1997023417A1/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
    • C02F3/286—Anaerobic digestion processes including two or more steps
    • 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
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1205—Particular type of activated sludge processes
    • C02F3/121—Multistep treatment
    • 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
    • C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
    • C02F3/342—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the enzymes used
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/30—Fuel from waste, e.g. synthetic alcohol or diesel
    • 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
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a process for the biodegradation of lipid materials, in particular triglycerides, phosphoglycerides and derived compounds, essential components of edible fats and oils.
  • It also relates to a device for implementing the process of biodegradation of lipid materials, in particular triglycerides, phosphoglycerides and derived compounds, essential components of fats and edible oils.
  • nuisances we can mention the clogging of evacuation pipes and sewers, the emission of unpleasant odors and the development of filamentous bacteria in treatment plants.
  • the present invention proposes to overcome the above drawbacks and to carry out a process and a device for implementing this process with a view to causing total biodegradation of lipid materials.
  • the lipid solubilized materials are drawn off at the bottom of a tank in which said first treatment step takes place, and these solubilized lipid materials are poured into an enclosure for the implementation of said second processing step.
  • the device comprises means for removing the lipid materials dissolved at the bottom of said tank and for discharging them into said enclosure.
  • the device 10 essentially consists of a tank 11 in which is stored a mixture of water and lipid materials to be treated introduced by an opening 12 provided with a cover 13.
  • the tank is equipped with mixers 14, driven in rotation by electric motors 15.
  • a discharge pipe 17 is connected to the bottom, or in the lower zone of the tank 11 to allow the removal of dissolved lipid materials and their discharge into a basin 18 of a purification station.
  • lipid materials are transferred from the tank into the basin 18 of a purification station where they are biodegraded in a completely conventional manner by the bacteria which are there.
  • the final effluent from the treatment plant is not affected in its finality by the supply of solubilized lipid materials.
  • a variant of the second conventional digestion step with bacteria from the treatment plant can consist of an assimilation of lipid materials solubilized by methanogenic bacteria in one or more anaerobic digesters. Methane production is thus increased.
  • This two-step process is particularly advantageous because it is simple and easy to carry out economically. It suffices in fact to associate with a purification station, a pre-treatment tank making it possible to quickly obtain the solubilization of the lipid materials in water.

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  • Life Sciences & Earth Sciences (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)

Abstract

The device (10) for carrying out the method comprises a vessel (11) for storing a mixture of water and lipid materials to be treated fed in through an opening (12) provided with a cover (13). Specific bacterial strains capable of producing lipase enzymes are added to the mixture. The mixture is stirred by mixers (14) provided in the vessel (11) and rotated by electric motors (15). The bacteria are immediately operative to solubilise the lipid materials. A discharge channel (17) connected to the bottom of the tank (11) enables solubilised lipid materials to be drawn off and fed into a tank (18) in a treatment plant.

Description

PROCEDE ET DISPOSITIF DE BIODEGRADATION DES MATIERES LIPIDESPROCESS AND DEVICE FOR BIODEGRADATION OF LIPID MATERIALS
La présente invention concerne un procédé de biodégradation de matières lipides, notamment des triglycérides, phosphoglycérides et composés dérivés, composants essentiels des graisses et huiles alimentaires.The present invention relates to a process for the biodegradation of lipid materials, in particular triglycerides, phosphoglycerides and derived compounds, essential components of edible fats and oils.
Elle concerne également un dispositif pour la mise en oeuvre du procédé de biodégradation de matières lipides, notamment des triglycérides, phosphoglycérides et composés dérivés, composants essentiels des graisses et huiles alimentaires.It also relates to a device for implementing the process of biodegradation of lipid materials, in particular triglycerides, phosphoglycerides and derived compounds, essential components of fats and edible oils.
Les eaux usées provenant des cuisines privées ou de restaurants ainsi que de diverses entreprises du secteur agro-alimentaire traitant des produits laitiers, des produits carnés ou des oléagineux, contiennent des matières lipides d'origine alimentaire qui sont responsables de nuisances diverses difficiles à combattre. Parmi ces nuisances on peut mentionner le colmatage des conduits d'évacuation et des égouts, l'émission d'odeurs désagréables et le développement de bactéries filamenteuses dans les stations d'épuration.Wastewater from private kitchens or restaurants as well as from various companies in the agro-food sector processing dairy products, meat products or oilseeds, contains lipid materials from food which are responsible for various nuisances which are difficult to combat. Among these nuisances we can mention the clogging of evacuation pipes and sewers, the emission of unpleasant odors and the development of filamentous bacteria in treatment plants.
De nombreuses méthodes de traitement physico-chimique des matières lipides ont été testées, mais elles se révèlent à la fois onéreuses et peu performantes.Many methods of physico-chemical treatment of lipid materials have been tested, but they prove to be both expensive and ineffective.
Parmi ces procédés connus, on peut citer celui qui est décrit par la publication DE-C- 41 41 832 qui propose un procédé de traitement de boues de stations d'épuration. La boue est traitée par quatre groupes d'enzymes qui sont des amylases, des cellulases, des lipases et des protéases, en vue de l'élimination de quelques composants organiques des boues créées dans la station et de la production d'une boue plus minéralisée.Among these known processes, mention may be made of that described in publication DE-C-41 41 832 which proposes a process for treating sludge from treatment plants. The sludge is treated with four groups of enzymes which are amylases, cellulases, lipases and proteases, with a view to the elimination of some organic components from the sludge created in the station and the production of a more mineralized sludge. .
Ce procédé est coûteux en énergie et n'est pas particulièrement adapté au traitement des matières grasses.This process is costly in energy and is not particularly suitable for the treatment of fats.
On a par ailleurs constaté que les matières lipides, de par leur structure chimique, ne sont pas dégradées par la microflore usuelle des stations d'épuration. Seules certaines bactéries sont capables, grâce à leurs enzymes, de casser les molécules de matières lipides. Ces bactéries ne sont pratiquement pas présentes dans la biologie des stations d'épuration et par conséquent, ne peuvent pas agir sur les matières lipides pour fractionner leurs moléculesIt has also been found that lipid materials, by their chemical structure, are not degraded by the usual microflora of treatment plants. Only certain bacteria are able, thanks to their enzymes, to break down the molecules of lipid matter. These bacteria are practically not present in the biology of the stations and therefore cannot act on lipid materials to fractionate their molecules
La présente invention se propose de pallier les inconvénients ci-dessus et de réaliser un procédé ainsi qu'un dispositif de mise en oeuvre de ce procédé en vue de provoquer la biodégradation totale des matières lipides.The present invention proposes to overcome the above drawbacks and to carry out a process and a device for implementing this process with a view to causing total biodegradation of lipid materials.
Dans ce but, le procédé est caractérisé en ce que l'on procède en deux étapes successives : - une première étape au cours de laquelle on procède à une réduction des molécules de matières lipides en leurs composants, pour les rendre solubles dans l'eau, ce processus étant effectué grâce à des enzymes émises par des bactéries, - une seconde étape au cours de laquelle on procède à une biodégradation classique des matières lipides solubilisées au cours de la première étape.For this purpose, the method is characterized in that one proceeds in two successive stages: - a first stage during which one proceeds to a reduction of the molecules of lipid materials into their components, to make them soluble in water , this process being carried out using enzymes emitted by bacteria, - a second step during which a conventional biodegradation of the lipid materials solubilized during the first step is carried out.
Selon un mode de mise en oeuvre préféré, lesdites enzymes sont de type lipases capables de réduire les matières lipides en leurs constituants, à savoir un noyau de glyeérol et trois acides gras.According to a preferred embodiment, said enzymes are of the lipase type capable of reducing lipid materials into their constituents, namely a nucleus of glycerol and three fatty acids.
Au cours de ladite première étape du procédé on traite un mélange d'eau et de matières lipides dans une citerne et on effectue un brassage pour homogénéiser le mélange et créer un maximum de contacts entre les particules de matières lipides et les enzymes. Cette première étape est effectuée par hydrolyse biologique simple.During said first step of the process, a mixture of water and lipid materials is treated in a tank and mixing is carried out to homogenize the mixture and create maximum contact between the particles of lipid materials and the enzymes. This first step is carried out by simple biological hydrolysis.
Ladite seconde étape est effectuée dans une station d'épuration ou similaire, par une biodégradation classique. Cette biodégradation peut également se produire dans un digesteur anaérobie par assimilation par des bactéries méthanogènes.Said second step is carried out in a treatment plant or the like, by conventional biodegradation. This biodegradation can also occur in an anaerobic digester by assimilation by methanogenic bacteria.
De préférence, l'on procède à un soutirage des matières lipides solubilisées au fond d'une citerne dans laquelle se déroule ladite première étape de traitement, et l'on déverse ces matières lipides solubilisées dans une enceinte en vue de la mise en oeuvre de ladite seconde étape de traitement.Preferably, the lipid solubilized materials are drawn off at the bottom of a tank in which said first treatment step takes place, and these solubilized lipid materials are poured into an enclosure for the implementation of said second processing step.
Dans ce but également, le dispositif pour la mise en oeuvre de ce procédé est caractérisé en ce qu'il comporte une citerne dans laquelle un mélange d'eau et de matières lipides à traiter est stocké, auquel on additionne des bactéries capables de générer des enzymes lipases qui réduisent les matières lipides en leurs constituants, à savoir un noyau de glyeérol et trois acides gras, afin de les solubiliser dans une première étape, et une enceinte contenant des bactéries capables de digérer les matières lipides solubilisées au cours d'une seconde étape.For this purpose also, the device for implementing this method is characterized in that it comprises a tank in which a mixture of water and lipid material to be treated is stored, to which bacteria capable of generating lipase enzymes are added which reduce the lipid material to its constituents, namely a nucleus of glycerol and three fatty acids, in order to dissolve them in a first step, and an enclosure containing bacteria capable of digesting lipid materials dissolved in a second step.
Dans une forme de réalisation préférée du dispositif, ladite citerne comporte des moyens pour brasser le mélange au cours de ladite première étape.In a preferred embodiment of the device, said tank comprises means for mixing the mixture during said first step.
Selon les variantes de réalisation, l'enceinte dans laquelle se réalise ladite étape peut être un bassin d'une station d'épuration dans laquelle se réalise la seconde étape ou un digesteur anaérobie contenant des bactéries méthanogènes.According to the variant embodiments, the enclosure in which said step is carried out may be a basin of a purification station in which the second step is carried out or an anaerobic digester containing methanogenic bacteria.
Dans la forme de réalisation préférée du dispositif, celui-ci comporte des moyens pour prélever les matières lipides solubilisées au fond de ladite citerne et pour les déverser dans ladite enceinte.In the preferred embodiment of the device, it comprises means for removing the lipid materials dissolved at the bottom of said tank and for discharging them into said enclosure.
La présente invention sera mieux comprise en référence à la description d'un mode de réalisation préféré du procédé selon l'invention ainsi que du dispositif de mise en oeuvre, et au dessin annexé dont la figure unique représente schematiquement ce dispositif.The present invention will be better understood with reference to the description of a preferred embodiment of the method according to the invention as well as of the implementation device, and to the accompanying drawing, the single figure of which schematically represents this device.
En référence à la figure, le dispositif 10 selon l'invention se compose essentiellement d'une citerne 11 dans laquelle est stocké un mélange d'eau et de matières lipides à traiter introduit par une ouverture 12 munie d'un couvercle 13. La citerne est équipée de malaxeurs 14, entraînés en rotation par des moteurs électriques 15.Referring to the figure, the device 10 according to the invention essentially consists of a tank 11 in which is stored a mixture of water and lipid materials to be treated introduced by an opening 12 provided with a cover 13. The tank is equipped with mixers 14, driven in rotation by electric motors 15.
Un conduit d'évacuation 17 est raccordé au fond, ou dans la zone inférieure de la citerne 11 pour permettre le prélèvement de matières lipides solubilisées et leur déversement dans un bassin 18 d'une station d'épuration.A discharge pipe 17 is connected to the bottom, or in the lower zone of the tank 11 to allow the removal of dissolved lipid materials and their discharge into a basin 18 of a purification station.
Au cours de la première étape, on stocke dans la citerne 11 un mélange d'eau et de matières lipides insolubles dans l'eau. On ajoute à ce mélange des souches bactériennes spécifiques, capables de produire des enzymes lipases. Le mélange est brassé pour rester homogène et provoquer le maximum de contacts entre les particules de matières lipides et les enzymes. L'action des bactéries est intense et immédiate et consiste à réduire les matières lipides en leurs composants constitutifs, qui sont le glyeérol et trois acides gras, de telle manière que ces matières lipides sont rapidement solubilisées. Les composés des matières lipides dégradées par les enzymes restent en solution dans l'eau, les matières lipides non dégradées surnagent à la surface. Le prélèvement des matières lipides solubilisées se fait par simple pompage dans le fond de la citerne après un arrêt momentané du brassage.During the first stage, a mixture of water and water-insoluble lipid materials is stored in tank 11. To this mixture are added specific bacterial strains capable of producing lipase enzymes. The mixture is stirred to remain homogeneous and cause maximum contact between the particles of lipid matter and the enzymes. The action of the bacteria is intense and immediate and consists in reducing the lipid materials into their constituent components, which are glyeerol and three fatty acids, in such a way that these lipid materials are rapidly dissolved. The compounds of the lipid materials degraded by the enzymes remain in solution in water, the lipid materials not degraded float on the surface. The solubilized lipid material is removed by simple pumping from the bottom of the tank after a temporary stopping of the mixing.
Ces matières lipides sont transférées de la citerne dans le bassin 18 d'une station d'épuration où elles sont biodégradées de manière tout à fait classique par les bactéries qui s'y trouvent. L'effluent final de la station d'épuration n'est pas affecté dans sa finalité par l'apport de matières lipides solubilisées.These lipid materials are transferred from the tank into the basin 18 of a purification station where they are biodegraded in a completely conventional manner by the bacteria which are there. The final effluent from the treatment plant is not affected in its finality by the supply of solubilized lipid materials.
Une variante de la seconde étape de digestion classique par des bactéries de la station d'épuration peut consister en une assimilation des matières lipides solubilisées par des bactéries méthanogènes dans un ou plusieurs digesteurs anaérobies. La production de méthane est ainsi augmentée.A variant of the second conventional digestion step with bacteria from the treatment plant can consist of an assimilation of lipid materials solubilized by methanogenic bacteria in one or more anaerobic digesters. Methane production is thus increased.
Ce procédé en deux étapes est particulièrement avantageux parce qu'il est simple et facile à mettre en oeuvre de façon économique. Il suffit en effet d'associer à une station d'épuration, une citerne de prétraitement permettant d'obtenir rapidement la solubilisation des matières lipides dans de l'eau.This two-step process is particularly advantageous because it is simple and easy to carry out economically. It suffices in fact to associate with a purification station, a pre-treatment tank making it possible to quickly obtain the solubilization of the lipid materials in water.
La présente invention n'est pas limitée aux formes de réalisation décrites, mais peut subir diverses modifications et se présenter sous diverses variantes évidentes pour l'homme du métier. The present invention is not limited to the embodiments described, but can undergo various modifications and come in various variants obvious to those skilled in the art.

Claims

REVENDICATIONS
1. Procédé de biodégradation de matières lipides, notamment des triglycérides, phosphoglycérides et composés dérivés, composants essentiels des graisses et des huiles alimentaires, caractérisé en ce que l'on procède en deux étapes successives :1. A process for biodegrading lipid materials, in particular triglycerides, phosphoglycerides and derived compounds, essential components of fats and edible oils, characterized in that one proceeds in two successive stages:
- une première étape au cours de laquelle on procède à une réduction des molécules de matières lipides en leurs composants, pour les rendre solubles dans l'eau, ce processus étant effectué grâce à des enzymes émises par des bactéries, - une seconde étape au cours de laquelle on procède à une biodégradation classique des matières lipides solubilisées au cours de la première étape.- a first stage during which a reduction of the lipid matter molecules into their components is carried out, to make them soluble in water, this process being carried out using enzymes emitted by bacteria, - a second stage during from which a conventional biodegradation of the lipid solubilized materials is carried out during the first step.
2. Procédé selon la revendication 1, caractérisé en ce que lesdites enzymes sont du type lipases capables de réduire les matières lipides en leurs constituants, à savoir un noyau de glyeérol et trois acides gras.2. Method according to claim 1, characterized in that said enzymes are of the lipase type capable of reducing lipid materials into their constituents, namely a nucleus of glycerol and three fatty acids.
3. Procédé selon la revendication 1, caractérisé en ce que au cours de ladite première étape on traite un mélange d'eau et de matières lipides dans une citerne et on effectue un brassage pour homogénéiser le mélange et créer un maximum de contacts entre les particules de matières lipides et les enzymes.3. Method according to claim 1, characterized in that during said first step a mixture of water and lipid materials is treated in a tank and mixing is carried out to homogenize the mixture and create maximum contact between the particles lipid materials and enzymes.
4. Procédé selon la revendication 1, caractérisé en ce que l'on effectue ladite première étape par hydrolyse biologique simple.4. Method according to claim 1, characterized in that said first step is carried out by simple biological hydrolysis.
S. Procédé selon la revendication 1, caractérisé en ce que ladite seconde étape est effectuée dans une station d'épuration ou similaire par une biodégradation classique.S. Method according to claim 1, characterized in that said second step is carried out in a treatment plant or the like by conventional biodegradation.
6. Procédé selon la revendication 1, caractérisé en ce que ladite seconde étape est effectuée dans un digesteur anaérobie par assimilation par des bactéries méthanogènes.6. Method according to claim 1, characterized in that said second step is carried out in an anaerobic digester by assimilation by methanogenic bacteria.
7. Procédé selon la revendication 1, caractérisé en ce que l'on procède à un soutirage des matières lipides solubilisées au fond d'une citerne dans laquelle se déroule ladite première étape de traitement, et en ce que l'on déverse ces matières lipides solubilisées dans une enceinte en vue de la mise en oeuvre de ladite seconde étape de traitement. 7. Method according to claim 1, characterized in that one proceeds to a withdrawal of the lipid materials dissolved at the bottom of a tank in which takes place said first treatment step, and in that these lipid materials are discharged solubilized in an enclosure for the implementation of said second treatment step.
8. Dispositif pour la mise en oeuvre du procédé de biodégradation de matières lipides, notamment des triglycérides, phosphoglycérides et composés dérivés, composants essentiels des graisses et des huiles alimentaires caractérisé en ce qu'il comporte une citerne (1 1) dans laquelle un mélange d'eau et de matières lipides à traiter est stocké, auquel on additionne des bactéries capables de générer des enzymes lipases qui réduisent les matières lipides en leurs constituants, à savoir un noyau de glyeérol et trois acides gras, afin de les solubiliser dans une première étape, et une enceinte contenant des bactéries capables de digérer les matières lipides solubilisées au cours d'une seconde étape.8. Device for implementing the process for biodegrading lipid materials, in particular triglycerides, phosphoglycerides and derived compounds, essential components of fats and edible oils, characterized in that it comprises a tank (1 1) in which a mixture of water and lipid materials to be treated is stored, to which bacteria capable of generating lipase enzymes are added which reduce lipid materials to their constituents, namely a nucleus of glyerol and three fatty acids, in order to dissolve them in a first stage, and an enclosure containing bacteria capable of digesting the lipid materials solubilized during a second stage.
9. Dispositif selon la revendication 8, caractérisé en ce que ladite citerne (11) comporte des moyens pour brasser le mélange au cours de ladite première étape.9. Device according to claim 8, characterized in that said tank (11) comprises means for stirring the mixture during said first step.
10. Dispositif selon la revendication 8, caractérisé en ce que ladite enceinte est un bassin (18) d'une station d'épuration dans laquelle se réalise ladite seconde étape.10. Device according to claim 8, characterized in that said enclosure is a basin (18) of a purification station in which said second step is carried out.
11 Dispositif selon la revendication 8, caractérisé en ce que ladite enceinte est un digesteur anaérobie contenant des bactéries méthanogènes.11 Device according to claim 8, characterized in that said enclosure is an anaerobic digester containing methanogenic bacteria.
12. Dispositif selon la revendication 8, caractérisé en ce qu'il comporte des moyens12. Device according to claim 8, characterized in that it comprises means
(17) pour prélever les matières lipides solubilisées au fond de ladite citerne et pour les déverser dans ladite enceinte. (17) for removing the lipid solubilized materials from the bottom of said tank and for discharging them into said enclosure.
PCT/CH1996/000462 1995-12-22 1996-12-23 Lipid material biodecomposition device and method WO1997023417A1 (en)

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Application Number Priority Date Filing Date Title
EP96942232A EP0810977A1 (en) 1995-12-22 1996-12-23 Lipid material biodecomposition device and method

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FR9515802A FR2742741B1 (en) 1995-12-22 1995-12-22 PROCESS AND DEVICE FOR BIODEGRADATION OF LIPID MATERIALS
FR95/15802 1995-12-22

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EP0712809A1 (en) * 1994-11-21 1996-05-22 Elf Aquitaine Production Process for enzymatic pretreatment of drill cuttings

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WO1989001457A1 (en) * 1987-08-10 1989-02-23 Alfred Louis Boutaud Process and device for heating organic effluents by digestion in an activated conditioned medium
EP0421223A1 (en) * 1989-10-04 1991-04-10 Achille Poglio A process and plant for disposal of organic effluents
FR2659645A1 (en) * 1990-03-13 1991-09-20 So Ge Val Sa Process for the biological degradation of fatty matter present in sewage
DE4141832C1 (en) * 1991-12-18 1993-05-19 Dauber, Siegfried Reinhard, Dipl.-Ing., 5100 Aachen, De Waste water process and appts. treats mixt. of activated and primary sludges
EP0712809A1 (en) * 1994-11-21 1996-05-22 Elf Aquitaine Production Process for enzymatic pretreatment of drill cuttings

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FR2742741A1 (en) 1997-06-27
FR2742741B1 (en) 1998-02-27
EP0810977A1 (en) 1997-12-10

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