DE102013102642A1 - Method and device for producing biogas - Google Patents

Abstract

The present invention relates to a method for producing biogas, a solid fermenter chamber (40, 42) being provided for fermenting stackable biomass and percolate being repeatedly applied to the stackable biomass in the solid fermenter chamber (40, 42), the percolate coming from the stirrable fermentation substrate a liquid fermentation plant (2) is generated.

Description

Technical area

The present invention relates to a method and a device for generating biogas, preferably for the production of biogas from both stackable, as well as from stirrable biomass.

State of the art

It is known to ferment organic solids and in particular stackable biomass in so-called solid fermentation plants in order to obtain biogas therefrom. Furthermore, it is known to ferment stirrable biomass in so-called liquid fermentation plants in order to also obtain biogas from this. The biogas obtained in this way is subsequently typically used for heat generation and / or combined heat and power plants for the coupled generation of electricity and heat. After purification, the biogas can also be sold as biomethane and can for example be fed into the natural gas grid or used for the operation of vehicles.

In the known solid-state fermentation, the organic solids are introduced into a solid-fermenter chamber and then periodically charged with a percolate stream. The percolate drizzled through the solid bed formed by the stackable biomass is usually collected at the bottom of the solid-fermentor chamber, circulated and then trickled over the stackable biomass in the respective or another solid-fermenter chamber. The percolate flow is applied to the biomass from the ceiling of the solid fermenter chamber to start and then continue the fermentation process.

A Feststofffermenterkammer is usually designed like a garage and has gas-tight walls, ceiling and floor, which are often poured concrete, and a gas-tight gate.

In this way, anaerobic digestion of the biomass is possible. The biogas is usually withdrawn via corresponding line devices from the solid fermenter chamber. Through the gate, the solid fermenter chamber can be loaded with the organic solids.

After the fermentation process of a loading of a solids fermenter with organic solids is completed, that is approximately after 4-5 weeks, the digestate is discharged through the gate from the corresponding solid fermenter chamber.

In the known processes, the organic solids are fermented in an anaerobic environment in the solid fermenter chamber, wherein the correspondingly required microorganisms are supplied inter alia by means of the drizzled percolate. The organic solids are "inoculated" accordingly by the percolate. In the Feststofffermenterkammer the organic solids are then fermented to form biogas.

The fermentation process can be divided into the following four stages: In the first stage, hydrolysis, the biomolecules present in the organic biomass are broken into fragments by reaction with water, releasing hydrogen and CO ₂ . In the second step, acidogenesis, the fragments formed in the hydrolysis are reacted on the one hand into lower fatty acids and / or carboxylic acids such as butyric acid or propionic acid, on the other hand into lower alcohols such as ethanol. In the third stage, acetogenesis, the lower fatty acids and / or carboxylic acids formed during the hydrolysis and acidogenesis and the lower alcohols are converted by acetogenic microorganisms primarily to acetic acid, or to its dissolved salt, the acetate. In the fourth stage, methanogenesis, on the one hand, acetic acid is converted to methane and carbon dioxide by acetic acid-splitting methanogens, and on the other hand methane of hydrogen and CO _{2 is produced} by another group of methanogens. The biogas produced in this process is largely made up of methane. Accordingly, it is a high-energy gas, which is formed under the anoxic conditions from the organic solids by fermentation.

In the fermentation of stirrable biomass in liquid fermentation plants, it is known to make the mass stir and flowable by a high water content in the fermentation substrate. Here, a continuous mixing during fermentation is sought, which is usually achieved by the use of mixing propellers in the / the fermenter (s) of the liquid fermentation plant, whereby swimming and sinking layers are avoided. The fermentation substrate is accordingly also easy to pump.

Furthermore, it is known that a liquid fermentation plant can be fed not only with already liquid biomass, such as manure from livestock farming, but also with solid biomass, for example energy crops. The energy crops are prepared in advance by chopping, shredding or grinding to be introduced via a solids feeder in liquid fermenter. Under certain circumstances, liquid (water, manure, recirculated process water) was added to obtain also a pumpability.

Processes for producing biogas have hitherto usually been carried out either as dry fermentation or solid-state fermentation or else as liquid fermentation, so that the substrate spectrum which could be processed in the respective plants was restricted either to stackable biomass or to liquid or liquefiable biomass.

Presentation of the invention

Starting from the known prior art, it is an object of the present invention to specify a method and a device for generating biogas, in which stackable biomass can be processed in an efficient manner in connection with a liquid fermentation plant.

This object is achieved by a method having the features of claim 1. Advantageous developments emerge from the subclaims.

Accordingly, a method for producing biogas, wherein at least one solid fermenter chamber is provided for the fermentation of stackable biomass and percolate is repeatedly applied to the stackable biomass in the solid fermenter chamber proposed. According to the invention, the percolate is produced from the stirrable fermenting substrate / tank contents of a liquid fermentation plant.

By producing the percolate for application to the stackable biomass in the solid fermenter chamber from the stirrable fermentation substrate / tank contents of a liquid fermentation plant, it can be achieved that the solid fermenter chamber and the liquid fermentation plant are connected to one another via the percolate flow. In this way, depending on the respective available quantities of stirrable or stackable biomass, the overall plant and the process can be flexibly and modularly adapted to the respective quantities to be fermented.

The stirrable fermentation substrate or the tank contents of the liquid fermentation plant can be removed, for example, in a liquid fermenter, a hydrolysis stage, a repository, a slurry storage or other locations of the liquid fermentation plant. However, the stirrable fermentation substrate of the liquid fermentation plant is particularly preferably taken directly from the liquid fermenter or at an overflow of the liquid fermenter.

The method is particularly well suited to be used with an already existing or yet to be constructed liquid fermentation plant. Here, only a connection to a solid-matter fermentation plant has to be produced and a possibility for processing the stirrable fermentation substrate from the liquid fermentation plant is provided, which makes it possible to process the stirrable fermentation substrate into percolate which can be applied to the stackable biomass in the solid-fermenter chamber. In particular, the percolate must be such that it does not clog the percolate nozzles and is pumpable.

Thus, the entire substrate spectrum can be covered and both liquid and solid biomass can be fermented in an optimized manner for biogas production. Excessive entry of solid and dry biomass into the liquid fermentation plant can thus be avoided. Furthermore, the otherwise in a pure solid fermenter chamber non-fermentable liquid biomass can be fermented in the liquid fermentation plant.

Furthermore, in the method, the introduction of the respective different biomass can be split accordingly. The solids or the stackable biomass can be introduced into the solid-fermenter chamber and the stirrable biomass can be introduced into the liquid fermentation plant. In this way, the power consumption of the entire system can be reduced. For example, the comminution or shredding or milling of solids for introduction into the liquid fermentation plant can largely be dispensed with since the solids are fed to the solid-fermenter chamber. In the corresponding introduction devices for moist or dry and solid biomass in a Flüssigfermentationsanlage can be completely dispensed with in this way, for example.

Furthermore, by reducing the introduction of stackable biomass or solids into the liquid fermentation plant, the stirrability of the liquid fermentation substrate in the liquid fermentation plant is improved, whereby here too the current consumption for the corresponding agitators can be reduced or the corresponding drive devices can be made smaller. Here too, a significant energy saving can be achieved, whereby the system efficiency is improved.

The production of the percolate from the fermentable fermentation substrate of the liquid fermentation plant has the advantage that the percolate is already provided with the corresponding microorganisms, so that after a refill of the Feststofffermenterkammer a fast start of the fermentation process in the solid fermenter chamber can be achieved. The stackable biomass in the solid-fermenter chamber is correspondingly inoculated via the percolate produced from the stirrable fermentation substrate of the liquid fermentation plant, so that efficient binding takes place here.

In addition, the stirrability in the liquid fermentation plant is improved by the reduced input of solids, which also greatly reduces the formation of floating layers.

The corresponding splitting of the input streams into dry and stackable biomass as well as into liquid and moist biomass makes it possible to ferment the entire spectrum or an extended spectrum of biomass in the proposed process for producing biogas. Accordingly, the method also leads to an increased efficiency of the plant operation, as well as the usually problematic for fermentation, very dry solids can be fermented.

The percolate is preferably collected at the bottom of the solid-fermenter chamber and returned to the liquid fermentation plant. Accordingly, a percolate cycle can be produced in this way, which extends from the liquid fermentation plant in the solid fermenter chamber and from the solid fermenter chamber back into the liquid fermentation plant.

The solid-fermenter chamber increases the stability of the overall system by the microbiological activity on the solid bed. As a result of the constant trickling through of the solid bed or the stackable biomass in the solid fermenter chamber, biofilms are formed on the large surface of the solid bed whose microorganisms settling therein rapidly degrade acids in the produced percolate and, on the other hand, metabolize newly formed acids efficiently in the solid fermenter chamber. If excess acids are formed, these are discharged with the Perkolatstrom in the liquid system and implemented there.

The production of the percolate from the flowable fermentation substrate from the liquid fermentation plant is preferably achieved via percolate preparation. For this purpose, a solid-liquid separation is particularly preferably carried out, for example by filtration, pressing or sieving, so that from the stirrable fermentation substrate of the liquid fermentation plant according to the percolate is generated. The removal of percolate can take place before, in, between and after the slurry storage, the hydrolysis stage, the liquid fermenter (main fermenter), the post-fermenter or the repository of the liquid fermentation plant.

Particularly preferably, the percolate is brought as gently as possible to the desired process temperature before application to the stackable biomass in the solid fermenter chamber, preferably heated.

Preferably, in the process for the production of biogas, mainly liquid and moist biomass are fed to the liquid fermentation via a metering device. By contrast, dry, solid and contaminated stackable biomass is preferably fed to the solid-fermenter chamber (by means of wheel loaders or other filling vehicles). Particularly advantageous in the use of the solid-fermenter chamber is its insensitivity to contaminants (plastics, metals, stones, earth, etc.) which have no negative influence on the fermentation process, on the operation or on the material.

To produce the percolate, the stirrable fermentation substrate from the liquid fermentation plant is preferably prepared in a percolate preparation before the percolate is applied to the stackable biomass in the solid-fermenter chamber. In a preferred embodiment, a solid-liquid separation is carried out in the percolate preparation, wherein particularly preferably the solid constituent of the stirrable fermentation substrate obtained in the solid-liquid separation from the liquid fermentation plant is introduced into the solid-fermenter chamber. By said training of Perkolataufbereitung a percolate cycle can be formed in a simple manner, which connects the Feststofffermenterkammer with the Flüssigfermentationsanlage.

Preferably, in or after the percolate treatment, the temperature of the percolate is controlled to a temperature required in the solid-fermenter chamber, so that a thermophilic operation of the solid-fermenter chamber can be carried out without having to provide another heater on the solid-fermenter chamber.

The percolate cycle can be formed by collecting the percolate at the bottom of the solid fermenter chamber and returning it to the liquid fermentation plant via a percolate return line.

The solid fraction of the fermentable fermentation substrate obtained in the treatment, and in particular the solid-liquid separation, is preferably introduced into the solid-fermenter and fermented therein.

Furthermore, it is achieved that the separated fermentation and thus optimized for the respective substrate fermentation of biodegradation is improved, thereby achieving a more stable biologically stable substrate. Accordingly, gas production in the repository is reduced, which means less greenhouse gas emissions from uncovered repositories.

In the method, the generated biogas is preferably analyzed such that a sufficient total gas concentration for the combustion of the gas in the combined heat and power plant is always ensured. This can also be achieved by the fact that a gas buffering is interposed.

The above object is further achieved by a device having the features of claim 10. Advantageous developments emerge from the subclaims.

Accordingly, an apparatus for producing biogas, comprising at least one solid fermenter chamber for fermentation of stackable biomass, wherein in the solid fermenter chamber at least one percolate nozzle is provided for applying percolate to the stackable biomass, proposed. According to the invention, a percolate preparation for producing the percolate to be introduced into the solid-fermenter chamber from the stirrable fermentation substrate of a liquid fermentation plant is provided.

In the percolate preparation, a solid-liquid separation of the stirrable fermentation substrate from the liquid fermentation plant is preferably feasible, and the percolate preparation preferably has a filter device, a squeeze device, a separation device, a centrifuging device or another separating device.

The percolate cycle can be formed via a percolate return line for returning the percolate collected at the bottom of the solid fermenter chamber to the liquid fermentation plant.

Brief description of the figures

Preferred further embodiments and aspects of the present invention will be explained in more detail by the following description of the figure.

1 schematically shows a device for generating biogas in a possible embodiment.

Detailed description of preferred embodiments

In the following, preferred embodiments will be described with reference to the figure.

In 1 is a device 1 for the production of biogas, wherein a liquid fermentation plant 2 is provided, which, inter alia, has the following components: a liquid fermenter 20 (Main fermenter), an overflow 22 , a repository 24 and a solids doser 26 ,

The liquid fermenter 20 is constructed in a conventional manner and preferably has a corresponding agitator, by means of which, among other things, the biomass taken in the form of fermentation substrate is stirred. Furthermore, in the liquid fermenter 20 Tempering devices provided by means of which a corresponding temperature of the stirrable fermentation substrate can be achieved.

About the solids doser 26 or previously, solid and wet biomass may be pre-treated accordingly, for example chopped, shredded or ground, and then through the solids feeder 26 the liquid fermenter 20 be supplied.

In operation, it runs over the overflow 22 from the liquid fermenter 20 always fermentation substrate over, which then in the repository 24 until the disposal of the repository 24 is stored. The overflow 22 can also be formed by a line in an embodiment, not shown, is pumped or sucked through the active substrate.

The method of operation of the liquid fermentation plant 2 to carry out the liquid fermentation usually provides that new biomass via the solids feeder 26 or a direct introduction of liquid biomass into the liquid fermenter 20 takes place continuously or at fixed, shorter intervals. Accordingly located in the liquid fermenter 20 always a fermentation substrate mixture of already fermented biomass, biomass in the fermentation process as well as newly introduced biomass, which is not yet fermented. In the process of fermentation biogas, especially methane and carbon dioxide, is generated, which in a schematically indicated gas dome 28 which can also act as a gas cache, is trapped and via a biogas line 30 a combined heat and power plant 3 is fed, in which it is burned and used for power and heat generation.

At least one solid-matter fermentation plant 4 is provided, which here schematically in the form of box-shaped or garage-shaped solid-state fermenter chambers 40 . 42 (Here, two solid fermenter chambers are shown) is formed. These solid fermenter chambers 40 . 42 are formed in a known manner, and are represented by the gate shown schematically 44 sealed gas-tight.

In the solid fermenter chambers 40 . 42 can stackable biomass, which is indicated schematically, are introduced, for example using a wheel loader. It is not necessary the biomass, which in the solid fermenter 4 is introduced to pretreat in any form. A comminution or grinding of the biomass is correspondingly not necessary.

The fermentation process of the biomass in the solid-fermenter chambers 40 . 42 is also insensitive to the introduction of impurities, especially against the introduction of non-fermentable substances, such as soil, sand, metal or plastic. Accordingly, the stackable biomass in the Feststofffermenter 4 have any consistency, of course, the amount of actually fermentable biomass ultimately determines the efficiency of the entire system.

About a biogas line 32 this will be in the solid-fermenter 4 biogas ultimately generated at the gas buffer 28 or another gas line, which passes through the biogas line 30 the biogas the combined heat and power plant 3 provides.

The percolate, which has percolate nozzles 50 on the stackable biomass in the solid-fermenter chambers 40 . 42 is sprinkled over a Perkolataufbereitung 5 fed. The percolate preparation 5 is in the illustrated embodiment on the overflow 22 between liquid fermenter 20 and repository 24 fed. As previously described, however, the percolate can also be from any other area of the liquid fermentation plant 2 are removed and then prepared for application to the solid bed.

In the percolate preparation 5 For example, in the embodiment shown, a solid-liquid separation takes place, so that solids up to a predetermined size from the stirrable fermentation substrate, which over the overflow 22 from the liquid fermenter 20 the liquid fermentation plant 2 overflows, to be separated. This separation can be carried out, for example, by squeezing, centrifuging, sieving, filtering or other suitable separation methods. Accordingly, it is found in the on the percolate nozzles 50 fed and over the stackable biomass in the solid fermenter chambers 40 . 42 drenched percolate only a smaller proportion of dry matter compared to from the Flüssigfermentationsanlage 2 taken starting material, as well as the necessary microorganisms, which the fermentation process in the solid fermenter chambers 40 . 42 support. The majority of the solids, however, which in the percolate preparation 5 are not transported over the percolate.

Before, in, or after percolate preparation 5 Furthermore, in the exemplary embodiment shown, a tempering of the percolate takes place, so that it is applied to the in the solid-fermenter chambers 40 . 42 desired temperature is brought. In this way, the in the solid fermenter chambers 40 . 42 required heat energy can be entered via the percolate, so that a thermophilic operation of the solid fermenter chambers 40 . 42 is possible.

The feeding of the fermentable fermentation substrate from the Flüssigfermentationsanlage 2 into the percolate preparation 5 can, as shown here, at the overflow 22 but can also take place before, in, between and after the manure storage, the hydrolysis stage, the liquid fermenter 20 , the post-fermenter or the repository 24 respectively.

In the pekolate preparation 5 Separated solids may be present during the reloading of the solid-matter fermentation plant 4 in a corresponding solid fermenter chamber 40 . 42 be introduced. Depending on their nature, these abseparierten solids shares by adhesion of suitable microorganisms and mixing with the solid substrate, the fermentation of the solid substrate in the solid fermenter chambers 40 . 42 support and improve.

At the bottom of the respective solid fermenter chamber 40 . 42 or at the bottom of the solid-state fermentation plant 4 the percolate is collected again and via a percolate return 52 the liquid fermentation plant 2 fed again. In the embodiment shown, the percolate is on the Perkolatrückleitung 52 the liquid fermenter 20 the liquid fermentation plant 2 fed. The percolate can be the liquid fermentation plant 2 but also be supplied to any other meaningful point, for example, the solids meter 26 , so that here already an inoculation and moisture penetration of the solids doser 26 biomass to be introduced is achieved with the already provided with microorganisms percolate.

Through the percolation cycle, which first of the liquid fermentation plant 2 removed percolate, then over the solid bed in the respective Feststofffermenterkammern 40 . 42 trickled and over the Perkolatrückleitung 52 the liquid fermentation plant 2 can feed again a stabilization of the overall system can be achieved. The solid bed in the solid fermenter chambers 40 . 42 serves as a kind of large-scale microbiological reactor, since the solid bed acts as a biofilm carrier material.

The in the solid fermentation plant 4 and especially in the solid fermenter chambers 40 . 42 biomass to be introduced can also be very dry biomass by applying the percolate in the manner mentioned, which was not fermentable in conventional plants.

In plant operation can be achieved in this way that the entire spectrum of biomass, so not only liquid biomass such as liquid manure, or wet biomass such as manure, or biomass with a very high degree of degradation such as corn silage, which so far both in a liquid fermentation plant and fermented in a Feststofffermentationsanlage, but also very dry biomass (such as straw, landscaped grass, ...) or biomass can be fermented efficiently with low degree of degradation. It can be selected whether the respective biomass is fed to the solid-matter fermentation plant, or a liquid fermentation plant.

Biomass which is contaminated with impurities to a certain extent, for example with sand, earth or plastic and metal, is preferably the solid-state fermentation plant 4 be supplied, since this is particularly insensitive to contaminants. Here are to be feared at high proportion of impurities only limited by stress of Faulraumvolumen lower gas yields.

It follows from the overall system that this is particularly stable due to the circulation of the percolate and enables a correspondingly stable fermentation process, which at the same time enables a fast start of the fermentation process for newly introduced biomass both in the solid-state fermentation plant and in the liquid fermentation plant.

Furthermore, by splitting the corresponding input currents, the current consumption of the device (overall system) can be optimized, since on the one hand by a reduced entry of heavy solids in the liquid fermentation plant on the one hand, the current consumption at the solids meter 26 can be reduced and on the other hand, the stirrability in liquid fermenter 20 can be improved, which results in a lower power consumption and a reduction or avoidance of a plurality of floating layers.

This not only improves the fermentation process, but also reduces the power consumption.

Furthermore, the wear on the solids meter 26 and substrate-carrying lines and all moving parts with substrate contact, since less substrate (lower dry matter content) has to be transported / moved

Furthermore, the required energy to be supplied can be reduced by a combined temperature control in the solid-state fermentation plant and in the liquid fermentation plant, since the respective other device can also serve here as an energy or heat storage. This is a thermophilic operation and the solid fermenter 4 possible.

The percolate can be added to the percolate preparation 5 also liquid substrates are added, which also according to the solid bed in the Feststofffermenterkammern 40 . 42 be tricked. This makes it possible, even liquid substrates in the Feststofffermentationsanlage 4 to ferment. Here, the solid bed, which acts as a biofilm carrier material, is used to hold the correspondingly applied liquid substrate and to ferment in this area. In this way, the Feststofffermentationsanlage 4 Be "replenished" to maintain a corresponding fermentation performance or gas production in the solid-matter fermentation plant for a longer time than the usual Feststoff fermentation cycle away. This can be done in the percolate preparation 5 Accordingly, liquid substrate are added, which is then appropriately tempered over the solid bed.

This is preferably the cogeneration plant 3 supplied biogas analyzed to the effect that always a sufficient total gas concentration for combustion in the combined heat and power plant 3 is guaranteed. The control of the entire system is adjusted accordingly so that the gas yield to the operation of the combined heat and power plant 3 sufficient. Also the gas buffer 28 serves here to ensure that a sufficient amount of combustible gas the cogeneration plant 3 is supplied.

To the escape of climate-relevant gases at the opening of the solid fermenter 4 or at the opening of the repository 24 To avoid, preferably takes place before the opening of an inerting of the respective interior with, for example, with nitrogen. The digestate, which is the solid-fermentation plant 4 as well as the repository 24 is preferably used as a fertilizer or composted or otherwise processed.

As far as applicable, all the individual features illustrated in the individual embodiments can be combined and / or exchanged without departing from the scope of the invention.

LIST OF REFERENCE NUMBERS

1

Device for generating biogas

2

Liquid fermentation plant

20

liquid fermenter

22

overflow

24

repository

26

solid matter

28

gas dome

3

CHP

30

biogas line

32

biogas line

4

Solid fermentation plant

40

Solids digester chamber

42

Solids digester chamber

44

gate

5

Perkolataufbereitung

50

Perkolatdüse

52

Perkolatrückleitung

Claims (13)

Process for the production of biogas, wherein at least one solid fermenter chamber ( 40 . 42 ) is provided for the fermentation of stackable biomass and percolate repeatedly on the stackable biomass in the solid fermenter chamber ( 40 . 42 ), characterized in that the percolate of stirrable fermentation substrate of a liquid fermentation plant ( 2 ) is produced. A method according to claim 1, characterized in that for the production of the percolate, the stirrable fermentation substrate from the liquid fermentation plant ( 2 ) in a percolate preparation ( 5 ) before being applied to the stackable biomass in the solid fermenter chamber ( 40 . 42 ) is applied. Process according to claim 2, characterized in that in percolate preparation ( 5 ) a solid-liquid separation is performed. Process according to claim 3, characterized in that the solid constituent of the fermentable fermentation substrate obtained in the solid-liquid separation from the liquid fermentation plant ( 2 ) in the solid fermenter chamber ( 40 . 42 ) is introduced. Method according to one of claims 2 to 4, characterized in that before, during or after percolate preparation ( 5 ) a temperature of the percolate on a in the solid fermenter chamber ( 40 . 42 ) required temperature is performed. Process according to any one of the preceding claims, characterized in that the percolate is deposited at the bottom of the solid fermenter chamber ( 40 . 42 ) and via a percolate return ( 52 ) of the liquid fermentation plant ( 2 ) is returned. Method according to one of the preceding claims, characterized in that stackable biomass, in particular with a higher dry matter content, the solid fermenter chamber ( 40 . 42 ), liquid biomass or biomass with a lower dry matter content of the liquid fermentation plant ( 2 ) and wet biomass of the liquid fermentation plant ( 2 ) and / or the solid fermenter chamber ( 40 . 42 ) is supplied. Method according to one of the preceding claims, characterized in that contaminated material stackable biomass of the solid fermenter chamber ( 40 . 42 ) is supplied. Method according to one of the preceding claims, characterized in that at least one liquid fermentation plant ( 2 ) which provides the stirrable biomass for producing the percolate. Contraption ( 1 ) for the production of biogas comprising at least one solid fermenter chamber ( 40 . 42 ) for the fermentation of stackable biomass, wherein in the solid fermenter chamber ( 40 . 42 ) at least one percolate nozzle ( 50 ) is provided for applying percolate to the stackable biomass, characterized in that a Perkolataufbereitung ( 5 ) for producing the in the solid fermenter chamber ( 40 . 42 ) to be introduced percolate from a stirrable fermentation substrate of a liquid fermentation plant ( 2 ) is provided. Contraption ( 1 ) according to claim 10, characterized in that in the percolate preparation ( 5 ) a solid-liquid separation of the fermentable fermentation substrate from the liquid fermentation plant ( 2 ) and percolate processing ( 5 ) preferably comprises a filter device, a squeezing device, a separating device, a centrifuging device or another separating device. Contraption ( 1 ) according to claim 10 or 11, characterized in that a percolate return ( 52 ) for returning the at the bottom of the solid fermenter chamber ( 40 . 42 ) collected percolate into the liquid fermentation plant ( 2 ) is provided. Contraption ( 1 ) according to one of claims 10 to 12, characterized in that at least one liquid fermentation plant ( 2 ) is provided, which with the Perkolataufbereitung ( 5 ) is in fluid communication.

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