WO2021156802A1 - Method for producing biogas - Google Patents

Method for producing biogas Download PDF

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Publication number
WO2021156802A1
WO2021156802A1 PCT/IB2021/050937 IB2021050937W WO2021156802A1 WO 2021156802 A1 WO2021156802 A1 WO 2021156802A1 IB 2021050937 W IB2021050937 W IB 2021050937W WO 2021156802 A1 WO2021156802 A1 WO 2021156802A1
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digester
biogas
fermentation
vegetable oil
water hyacinths
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PCT/IB2021/050937
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French (fr)
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Michaël Jacques DEBIZE
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Debize Michael Jacques
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Publication of WO2021156802A1 publication Critical patent/WO2021156802A1/en

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    • C—CHEMISTRY; METALLURGY
    • C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
    • C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
    • C12P5/00—Preparation of hydrocarbons or halogenated hydrocarbons
    • C12P5/02—Preparation of hydrocarbons or halogenated hydrocarbons acyclic
    • C12P5/023—Methane
    • 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

Definitions

  • the present invention relates to a process for producing biogas.
  • Such fermentation can only occur in an anaerobic environment (without air) and requires a certain temperature which varies according to whether one wants to have a fermentation in psychrophilic mode (between 10 and 22 ° C), mesophilic (between 22 and 45 ° C) or thermophilic (between 45 and 75 ° C).
  • the anaerobic medium is obtained by drowning the organic material in a tank with a liquid.
  • the temperature required is obtained, for fermentation in a mesophilic regime and for fermentation in a thermophilic regime, by heating the mass of matter and liquid.
  • EP0142473 describes a process for the production of biogas, according to which solid fermentable organic material is allowed to ferment in an aerobic medium at substantially ambient temperature and having a suitable degree of humidity to bring it to a temperature higher than that required for a methane fermentation mesophilic in an anaerobic medium, and the fermenting organic material is flooded with liquid at substantially room temperature to increase the temperature of the liquid by heat exchange with the fermenting organic material.
  • the liquid is evacuated to store it in a thermally isolated medium by bringing the material to a suitable degree of humidity and the material is again brought to said higher temperature by aerobic fermentation.
  • the material is again flooded with the stored liquid to further increase the temperature thereof by heat exchange with the fermenting material, and the liquid is left in place once said required temperature has been reached to allow mesophilic methane fermentation. anaerobic to develop, and the gas given off during this anaerobic fermentation is collected.
  • FR893767 describes a process for producing combustible gas, more particularly methane, by fermentation of appropriate organic materials, which consists in subjecting said materials to two successive fermentations, to namely a first thermophilic or oxidative fermentation, with a view to destroying by combustion the bodies liable to give rise to the formation of harmful acids, such as butyric acid, and a second cold or reducing fermentation, to decompose the bodies, such as cellulose, in methane gas and carbon dioxide.
  • the object of the process of the present invention is to produce biogas by the rotting mixture of water hyacinth, organic matter, such as excrement and vegetable oil, the biogas being used in particular to produce electricity. This electricity could in particular be used for the self-supply of a building such as a factory. Certain components resulting from this process will be used as fertilizer thus allowing, in particular, the plant of trees in forest.
  • a process for the manufacture of combustible biogas and in particular methane comprises the steps of: i) disposing of ground water hyacinths in a digester; ii) Optionally dispose of organic matter in the digester; iü) Optionally dispose of vegetable oil in the digester; iv) Mix the ground water hyacinths and optionally the organic matter and / or vegetable oil at a temperature above room temperature allowing the development of methane fermentation; v) Recover the biogas produced following the fermentation of the mixture in the digester.
  • the mixture contains organic material.
  • the mixture comprises vegetable oil. According to these two embodiments, the mixture comprises between 20 and 75% of water hyacinths. In one embodiment, the roots of the water hyacinths are extracted before the water hyacinths are placed in the digester.
  • the mixture contains between 20 and 50% organic matter. In one embodiment, the mixture has between 1 and 20% vegetable oil.
  • vegetable oil is used frying oil.
  • the digester is fed 24 hours a day in 40 to 70 feeding cycles per day.
  • the mixed material is heated to a temperature between 40 ° C and 65 ° C.
  • the biogas recovered from the fermentation of organic materials is purified and becomes biomethane.
  • the biogas produced consists of between 40 and
  • the mixture ferments in the digester for a period of between 10 days and 30 days.
  • the waste at the exit of the digester is arranged to serve as a fertilizer after being mixed with the roots of the water hyacinths.
  • the invention also relates to a biogas obtainable by the process.
  • the process for the manufacture of combustible biogas and in particular of methane comprises the steps of disposing crushed water hyacinths, previously stripped of their roots, in a digester.
  • This plant is particularly common in Madagascar.
  • the harvested water hyacinth is put to macerate in vats. It is essential to keep only the part where the flowers and leaves of the water hyacinth are located, that is, the part without the roots. In fact, roots containing sand risk damaging the digester. However, the roots will have their uses, and will be used later in the process.
  • the water hyacinth releases a lot of methane when it is putrefying, it will then also be brought to the digester.
  • the vegetable oil should be placed in the digester.
  • the frying oils will be collected directly by the island's restaurants and taverns and will complete the process of manufacturing the biogas.
  • the biogas produced consists of between 40 and 70% methane.
  • the mixture should consist of between 20 and 70% water hyacinth, between 20 and 50% organic matter and between 1 and 20% vegetable oil.
  • the digester used is fed 24 hours a day in 40 to 70 feeding cycles per day. It is important that regular and rigorous maintenance be carried out in order to guarantee the optimal functioning of the digester. To do this, the digester system that will be used will be a horizontal system comprising several digester tanks, for example four, three of which would operate simultaneously while the fourth digester will be revised in cycles of three months. The mixture ferments in the digester for a period of between 10 days and 30 days.
  • digestate This digestate is an excellent fertilizer which can thus be used as fertilizer after having been mixed with the roots of water hyacinths which can in particular be used in the forest so that it regains its rights and that the concerns of deforestation in Madagascar are avoided.

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

Abstract

The invention relates to a method for producing combustible biogas, in particular methane, comprising the steps of: - arranging ground water hyacinths in a digester; - optionally arranging organic matter in the digester; - optionally arranging vegetable oil in the digester; - mixing the ground water hyacinths, organic matter and vegetable oil at a temperature above an ambient temperature to enable methane fermentation to develop; - recovering the biogas produced from the fermentation of the mixture in the digester.

Description

Procédé de production de bioqaz Bioqaz production process
La présente invention a pour objet un procédé de production de biogaz. The present invention relates to a process for producing biogas.
Pour produire du biogaz avec de la matière organique fermentable, tels que les déchets organiques, notamment des excréments, ainsi que de la jacinthe d’eau et de l’huile végétale, il faut que cette matière subisse une fermentation dite méthanique. To produce biogas with fermentable organic matter, such as organic waste, especially excrement, as well as water hyacinth and vegetable oil, this material must undergo a so-called methane fermentation.
Une telle fermentation ne peut se produire que dans un milieu anaérobie (sans air) et exige une certaine température qui varie selon que l'on veut avoir une fermentation en régime psychrophile (entre 10 et 22°C), mésophile (entre 22 et 45°C) ou thermophile (entre 45 et 75°C). Le milieu anaérobie est obtenu en noyant la matière organique dans une cuve avec un liquide. La température requise est obtenue, pour une fermentation en régime mésophile et une fermentation en régime thermophile, en chauffant la masse de matière et de liquide. Such fermentation can only occur in an anaerobic environment (without air) and requires a certain temperature which varies according to whether one wants to have a fermentation in psychrophilic mode (between 10 and 22 ° C), mesophilic (between 22 and 45 ° C) or thermophilic (between 45 and 75 ° C). The anaerobic medium is obtained by drowning the organic material in a tank with a liquid. The temperature required is obtained, for fermentation in a mesophilic regime and for fermentation in a thermophilic regime, by heating the mass of matter and liquid.
EP0142473 décrit un procédé de production de biogaz, suivant lequel on laisse fermenter en milieu aérobie de la matière organique fermentable solide à température sensiblement ambiante et ayant un degré d'humidité idoine pour l'amener à une température supérieure à celle exigée pour une fermentation méthanique mésophile en milieu anaérobie, et on noie la matière organique en fermentation avec du liquide à température sensiblement ambiante pour augmenter la température du liquide par échange de chaleur avec la matière organique en fermentation. On évacue le liquide pour le stocker en un milieu isolé thermiquement en ramenant la matière à un degré d'humidité idoine et on amène de nouveau la matière à ladite température supérieure par fermentation aérobie. On noie de nouveau la matière avec le liquide stocké pour augmenter encore davantage la température de celui-ci par échange de chaleur avec la matière en fermentation, et on laisse en place le liquide une fois ladite température exigée atteinte pour permettre à la fermentation méthanique mésophile anaérobie de se développer, et on recueille le gaz dégagé lors de cette fermentation anaérobie. EP0142473 describes a process for the production of biogas, according to which solid fermentable organic material is allowed to ferment in an aerobic medium at substantially ambient temperature and having a suitable degree of humidity to bring it to a temperature higher than that required for a methane fermentation mesophilic in an anaerobic medium, and the fermenting organic material is flooded with liquid at substantially room temperature to increase the temperature of the liquid by heat exchange with the fermenting organic material. The liquid is evacuated to store it in a thermally isolated medium by bringing the material to a suitable degree of humidity and the material is again brought to said higher temperature by aerobic fermentation. The material is again flooded with the stored liquid to further increase the temperature thereof by heat exchange with the fermenting material, and the liquid is left in place once said required temperature has been reached to allow mesophilic methane fermentation. anaerobic to develop, and the gas given off during this anaerobic fermentation is collected.
FR893767 décrit un procédé de production de gaz combustible, plus particulièrement de méthane, par fermentation de matières organiques appropriées, qui consiste à soumettre lesdites matières à deux fermentations successives, à savoir une première fermentation thermophile ou oxydante, en vue de détruire par combustion les corps susceptibles de donner lieu à la formation d'acides nocifs, telles que l'acide butyrique, et une seconde fermentation froide ou réductrice, pour décomposer les corps, telles que la cellulose, en gaz méthane et gaz carbonique. Le procédé de la présente invention a pour but de produire du biogaz par le mélange de putréfaction de la jacinthe d’eau, de matières organiques, tels des excréments et d’huile végétale, le biogaz servant notamment à produire de l’électricité. Cette électricité pourra notamment être utilisée à l’auto-alimentation d’un bâtiment telle une usine. Certains composants issus de ce procédé serviront de fertilisant permettant ainsi, notamment, la plante d’arbres en forêt. FR893767 describes a process for producing combustible gas, more particularly methane, by fermentation of appropriate organic materials, which consists in subjecting said materials to two successive fermentations, to namely a first thermophilic or oxidative fermentation, with a view to destroying by combustion the bodies liable to give rise to the formation of harmful acids, such as butyric acid, and a second cold or reducing fermentation, to decompose the bodies, such as cellulose, in methane gas and carbon dioxide. The object of the process of the present invention is to produce biogas by the rotting mixture of water hyacinth, organic matter, such as excrement and vegetable oil, the biogas being used in particular to produce electricity. This electricity could in particular be used for the self-supply of a building such as a factory. Certain components resulting from this process will be used as fertilizer thus allowing, in particular, the plant of trees in forest.
Conformément à l’invention, un procédé pour la fabrication de biogaz combustible et notamment de méthane, comprend les étapes consistant à : i) Disposer des jacinthes d’eau broyées dans un digesteur ; ii) Optionnellement disposer des matières organiques dans le digesteur ; iü) Optionnellement disposer de l’huile végétale dans le digesteur ; iv) Mélanger les jacinthes d’eau broyées et optionnellement les matières organiques et/ou l’huile végétale à une température supérieure à une température ambiante permettant le développement d’une fermentation méthanique ; v) Récupérer le biogaz produit suite à la fermentation du mélange dans le digesteur. According to the invention, a process for the manufacture of combustible biogas and in particular methane comprises the steps of: i) disposing of ground water hyacinths in a digester; ii) Optionally dispose of organic matter in the digester; iü) Optionally dispose of vegetable oil in the digester; iv) Mix the ground water hyacinths and optionally the organic matter and / or vegetable oil at a temperature above room temperature allowing the development of methane fermentation; v) Recover the biogas produced following the fermentation of the mixture in the digester.
Dans une forme d’exécution, le mélange comporte des matières organiques. In one embodiment, the mixture contains organic material.
Dans une forme d’exécution, le mélange comporte de l’huile végétale. Selon ces deux formes d’exécution, le mélange comporte entre 20 et 75% de jacinthes d’eau. Dans une forme d’exécution, les racines des jacinthes d’eau sont extraites avant que les jacinthes d’eau soient disposées dans le digesteur. In one embodiment, the mixture comprises vegetable oil. According to these two embodiments, the mixture comprises between 20 and 75% of water hyacinths. In one embodiment, the roots of the water hyacinths are extracted before the water hyacinths are placed in the digester.
Dans une autre forme d’exécution, le mélange comporte entre 20 et 50% de matières organiques. Dans une forme d’exécution, le mélange comporte entre 1 et 20% d’huile végétale. In another embodiment, the mixture contains between 20 and 50% organic matter. In one embodiment, the mixture has between 1 and 20% vegetable oil.
Selon cette forme d’exécution, l’huile végétale est une huile de friture usagee. In this embodiment, vegetable oil is used frying oil.
De préférence, le digesteur est nourri 24h sur 24 en 40 à 70 cycles d’alimentation par jour. Preferably, the digester is fed 24 hours a day in 40 to 70 feeding cycles per day.
Dans une autre forme d’exécution, la matière mélangée est chauffée à une température comprise entre 40°C et 65°C. In another embodiment, the mixed material is heated to a temperature between 40 ° C and 65 ° C.
Selon cette forme d’exécution, le biogaz récupéré de la fermentation des matériaux organiques, est épuré et devient du biométhane. Selon cette forme d’exécution, le biogaz produit est constitué entre 40 etAccording to this embodiment, the biogas recovered from the fermentation of organic materials is purified and becomes biomethane. According to this embodiment, the biogas produced consists of between 40 and
70% de méthane. 70% methane.
Selon cette forme d’exécution, le mélange fermente dans le digesteur pendant une durée comprise entre 10 jours et 30 jours. According to this embodiment, the mixture ferments in the digester for a period of between 10 days and 30 days.
Dans une autre forme d’exécution, les déchets à la sortie du digesteur sont agencés pour servir de fertilisant après avoir été mélangé aux racines des jacinthes d’eau. In another embodiment, the waste at the exit of the digester is arranged to serve as a fertilizer after being mixed with the roots of the water hyacinths.
L’invention concerne également un biogaz obtenable par le procédé. The invention also relates to a biogas obtainable by the process.
Dans un exemple non illustré, le procédé pour la fabrication de biogaz combustible et notamment de méthane, comprend les étapes consistant à disposer des jacinthes d’eau broyées, préalablement débarrassées de leurs racines, dans un digesteur. Cette plante est notamment très fréquente à Madagascar. En ce qui concerne la fabrication de jacinthe fermentée, la jacinthe d'eau récoltée est mise à macérer dans des cuves. Il est essentiel de ne garder que la partie où se trouvent les fleurs et les feuilles de la jacinthe d'eau, c'est-à-dire la partie sans les racines. En effet, les racines contenant du sable risquent de dégrader le digesteur. Cependant, les racines auront leur utilité, et seront utilisées ultérieurement dans le processus. La jacinthe d'eau dégageant beaucoup de méthane lorsqu'elle est en putréfaction, elle sera ensuite également amenée au digesteur. In an example not illustrated, the process for the manufacture of combustible biogas and in particular of methane comprises the steps of disposing crushed water hyacinths, previously stripped of their roots, in a digester. This plant is particularly common in Madagascar. With regard to the manufacture of fermented hyacinth, the harvested water hyacinth is put to macerate in vats. It is essential to keep only the part where the flowers and leaves of the water hyacinth are located, that is, the part without the roots. In fact, roots containing sand risk damaging the digester. However, the roots will have their uses, and will be used later in the process. The water hyacinth releases a lot of methane when it is putrefying, it will then also be brought to the digester.
Il convient ensuite de disposer des matières organiques dans le digesteur. La récolte des excréments se fera directement à partir des fosses septiques voire dans des stations d’épuration. It is then necessary to dispose of the organic matter in the digester. The collection of excreta will be done directly from septic tanks or even in treatment plants.
Il convient enfin de disposer de l’huile végétale dans le digesteur. Les huiles de friture seront récupérées directement par les restaurants et les gargotes de l'île et termineront le processus de fabrication du biogaz. Finally, the vegetable oil should be placed in the digester. The frying oils will be collected directly by the island's restaurants and taverns and will complete the process of manufacturing the biogas.
Ces matières seront alors mélangées et chauffées à une température comprise entre 40° et 65° permettant ainsi le développement d’une fermentation méthanique. These materials will then be mixed and heated to a temperature between 40 ° and 65 ° thus allowing the development of a methane fermentation.
En effet, la jacinthe d’eau dégage beaucoup de méthane lorsqu’elle est en putréfaction. This is because water hyacinth gives off a lot of methane when it rots.
Suite à la fermentation de ce mélange, le biogaz peut alors être récupéré puis ce dernier sera épuré afin de devenir du biométhane. Le biogaz produit est constitué entre 40 et 70% de méthane. Following the fermentation of this mixture, the biogas can then be recovered and then the latter will be purified in order to become biomethane. The biogas produced consists of between 40 and 70% methane.
De préférence, le mélange doit être composé entre 20 et 70% de jacinthes d’eau, entre 20 et 50% de matières organiques et entre 1 et 20% d’huile végétale. Preferably, the mixture should consist of between 20 and 70% water hyacinth, between 20 and 50% organic matter and between 1 and 20% vegetable oil.
Le digesteur utilisé est nourri 24h sur 24h en 40 à 70 cycles d’alimentation par jour. Il est important qu’un entretien régulier et rigoureux soit effectué afin de garantir le fonctionnement optimal du digesteur. Pour ce faire, le système de digesteur qui sera utilisé sera un système horizontal comportant plusieurs cuves de digesteur, par exemple quatre, dont trois qui fonctionneraient en simultanée pendant que le quatrième digesteur sera révisé selon des cycles de trois mois. Le mélange fermente dans le digesteur pendant une durée comprise entre 10 jours et 30 jours. The digester used is fed 24 hours a day in 40 to 70 feeding cycles per day. It is important that regular and rigorous maintenance be carried out in order to guarantee the optimal functioning of the digester. To do this, the digester system that will be used will be a horizontal system comprising several digester tanks, for example four, three of which would operate simultaneously while the fourth digester will be revised in cycles of three months. The mixture ferments in the digester for a period of between 10 days and 30 days.
Le digesteur en plus de produire du biogaz produit également des déchets à la sortie du digesteur. Ces déchets sont appelés digestat, ce digestat est un excellent engrais qui peut ainsi servir de fertilisant après avoir été mélangé aux racines des jacinthes d’eau qui pourra notamment être utiliser en forêt afin que celle-ci reprenne ses droits et que les soucis de déforestation à Madagascar soient évités. The digester in addition to producing biogas also produces waste at the exit of the digester. This waste is called digestate, this digestate is an excellent fertilizer which can thus be used as fertilizer after having been mixed with the roots of water hyacinths which can in particular be used in the forest so that it regains its rights and that the concerns of deforestation in Madagascar are avoided.

Claims

REVENDICATIONS
1. Procédé pour la fabrication de biogaz combustible et notamment de méthane, comprenant les étapes consistant à : i) Disposer des jacinthes d’eau broyées dans un digesteur ; ii) Optionnellement disposer des matières organiques dans le digesteur ; iii) Optionnellement disposer de l’huile végétale dans le digesteur ; iv) Mélanger les jacinthes d’eau broyées, optionnellement les matières organiques et/ou l’huile végétale, à une température supérieure à une température ambiante permettant le développement d’une fermentation méthanique ; v) Récupérer le biogaz produit suite à la fermentation du mélange dans le digesteur. 1. A method for the manufacture of combustible biogas and in particular methane, comprising the steps of: i) placing crushed water hyacinths in a digester; ii) Optionally dispose of organic matter in the digester; iii) Optionally dispose of vegetable oil in the digester; iv) Mix the ground water hyacinths, optionally organic matter and / or vegetable oil, at a temperature above room temperature allowing the development of methane fermentation; v) Recover the biogas produced following the fermentation of the mixture in the digester.
2. Procédé selon la revendication 1, comportant des matières organiques, typiquement entre 20 et 50% en poids. 2. Method according to claim 1, comprising organic materials, typically between 20 and 50% by weight.
3. Procédé selon la revendication 1 ou 2, comportant de l’huile végétale, typiquement entre 1 et 20% en poids. 3. Method according to claim 1 or 2, comprising vegetable oil, typically between 1 and 20% by weight.
4. Procédé selon la revendication 2 ou 3, dans lequel le mélange comporte entre 20 et 75% en poids de jacinthes d’eau. 4. The method of claim 2 or 3, wherein the mixture comprises between 20 and 75% by weight of water hyacinths.
5. Procédé selon l’une des revendications précédentes, dans lequel les racines des jacinthes d’eau sont extraites avant que les jacinthes d’eau soient disposées dans le digesteur. 5. Method according to one of the preceding claims, wherein the roots of the water hyacinths are extracted before the water hyacinths are placed in the digester.
6. Procédé selon l’une des revendications 3 à 5, dans lequel l’huile végétale est une huile de friture usagée. 6. Method according to one of claims 3 to 5, wherein the vegetable oil is used frying oil.
7. Procédé selon l’une des revendications précédentes, dans lequel le digesteur est nourri 24h sur 24 en 40 à 70 cycles d’alimentation par jour. 7. Method according to one of the preceding claims, wherein the digester is fed 24 hours a day in 40 to 70 feed cycles per day.
8. Procédé selon la revendication 1 , dans lequel la matière mélangée est chauffée à une température comprise entre 40°C et 65°C. 8. The method of claim 1, wherein the mixed material is heated to a temperature between 40 ° C and 65 ° C.
9. Procédé selon la revendication 1, dans lequel le biogaz récupéré de la fermentation est épuré et devient du biométhane. 9. The method of claim 1, wherein the biogas recovered from the fermentation is purified and becomes biomethane.
10. Procédé selon la revendication 1 dans lequel le biogaz produit est constitué entre10. The method of claim 1 wherein the biogas produced is formed between
40 et 70% de méthane. 40 and 70% methane.
11. Procédé selon la revendication 1 dans lequel le mélange fermente dans le digesteur pendant une durée comprise entre 10 jours et 30 jours. 11. The method of claim 1 wherein the mixture ferments in the digester for a period of between 10 days and 30 days.
12. Un procédé selon les revendications précédentes dans lequel les déchets à la sortie du digesteur sont agencés pour servir de fertilisant après avoir été mélangé aux racines des jacinthes d’eau. 12. A method according to the preceding claims wherein the waste at the outlet of the digester is arranged to serve as fertilizer after having been mixed with the roots of water hyacinths.
13. Biogaz obtenable par le procédé des revendications 1 à 12. 13. Biogas obtainable by the process of claims 1 to 12.
PCT/IB2021/050937 2020-02-05 2021-02-05 Method for producing biogas WO2021156802A1 (en)

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EP0142473A2 (en) 1983-11-09 1985-05-22 Armand Cotton A method of producing biogas and compost
EP0227584A2 (en) * 1985-12-27 1987-07-01 MANNESMANN Aktiengesellschaft Process and apparatus for the drying of water plants
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GB2472183A (en) * 2009-06-09 2011-02-02 Hydroharvest Internat Ltd Processing aquatic plant material
EP2998386A2 (en) * 2014-09-17 2016-03-23 Rogmans, Maria Method for operating a biogas plant
CN106753677A (en) * 2017-01-19 2017-05-31 云南顺丰洱海环保科技股份有限公司 Biogas residue biomass fuel and preparation method thereof

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