EP3083932A1

EP3083932A1 - Modular system for constructing a biogas fermenter

Info

Publication number: EP3083932A1
Application number: EP13843032.7A
Authority: EP
Inventors: Oliver Nacke; Carsten Mantey
Original assignee: Archea GmbH
Current assignee: Archea GmbH
Priority date: 2013-12-17
Filing date: 2013-12-17
Publication date: 2016-10-26
Also published as: WO2015090261A1

Abstract

The invention relates to a modular system (1) which allows a biogas fermenter comprising a container for receiving biomass to be constructed using simple technical means. One part of the container is formed by a recess (2) in the ground (6). An above-ground part of the container consists of a ring-shaped steel wall (5) which is composed of a plurality of curved individual sheets (5), the ring-shaped side wall (5) being arranged on a ring-shaped ground anchoring, e.g. a foundation (7). The container receiving the biomass is configured using special, water-tight container films (9', 9") which are connected to a gas-tight covering roof (9).

Description

CONSTRUCTION BOX SYSTEM FOR CREATING A BIOGASFERMENTER

The present invention is concerned with a modular system for creating a Biogasfermenters, with simple means at the site

is assembled, in particular with a construction that can also be created by trained personnel.

Such a fermentation container is known from DE 103 54 598 B4. This document discloses a container which is disposed over a flat insulating layer on a loose gravel bed. The lateral boundary walls of a plurality of metallic segments are annularly screwed together not liquid-tight. On the inner walls and on the bottom of the Fermentierbehälters an insulating layer is disposed, over which extends a waterproof and biomasseresistente film. The side walls support a truss structure supported by a center pillar, the lower end of the center pillar being supported by a concrete slab.

A similar container for the production of biogas is further known from DE 201 17 518 U1. This known container has a flat, towards the center inclined foundation on which a tubular support is arranged. At the head of the support a Seilabspannung is arranged, which supports the above arranged gas hood, when the amount of gas formed decreases. Further, in the lateral area of the container arranged an agitator whose central axis protrudes at an angle of approximately 40 ° to the vertical in the biomass.

WO 82/00299 discloses an apparatus for the anaerobic digestion of organic solids, which comprises a spherical container of flexible material, wherein a part of the container is embedded in the ground and surrounded by a ring wall, preferably made of precast concrete parts.

A disadvantage of the entire state of the art, it is felt that the functional design of the biogas container is technically too expensive and can only be created by professionals. Furthermore, the maintenance of the known systems is not easy, which also means that often maintenance must be performed, which can interfere with the continuous operation of the system sensitive.

Another disadvantage of the known in the art biogas plants is the fact that the construction of such a system creates avoidable logistical problems that can lead to significant delays in the construction of the system, especially if the system overseas or far away to be built by the manufacturer.

Furthermore, it is disadvantageous in the prior art that the production of a

closed concrete foundations can cause difficulties in the

In general, it can not be assumed that, on the one hand, concrete of the required quality and quantity, as well as cost-effective as it is needed, can not be realized with the required evenness necessary for the concrete fermenters available on the market today. In doing so, the safety regulations valid for the respective country must be precisely defined when constructing the construction and operating instructions and taken into account in the design. The systems currently on the market for container construction initially consist of a concrete floor slab. The tolerances in the flatness of this plate is + - 1cm, which is not sufficient to put the precisely manufactured wall elements on the outer ring and seal. The walls in the case of a steel construction in tank construction are usually made of steel plates. The dimensions of these plates are about 1, 5m in height and 3m in length. The plates are rolled in the radius of the container diameter. The connection of the plates, which are then bolted to a ring, is done with holes and screws that connect the overlapping sheets. These joints are sealed at the moment of assembly by pressing tough, rubber-like sealant between the overlapping surfaces. This special sealant must be applied very carefully, since the resulting container rings expand radially under load and so only the tensile force acts on the screw elements. Often arise here

unprofessional handling when creating leaks. The use of experienced installation supervisors is essential here. The ground connection of the slab design requires careful concrete production in addition to careful

Sealing work. Here, the sealant between the bottom rail, a bent angle steel and the concrete floor is introduced.

The corrosion protection of the bolted steel plates takes place in the factory during production, before the construction site delivery. The plates are in contact with the medium, so that the corrosion protection must be based on the appropriate medium. This can with simple Löschwassertanks a

Galvanizing or heavier for low pH media

Anticorrosive with an often three-layer Emallierung be complicated as a glass surface is applied at high temperatures.

Furthermore, the submersible mixers (TMR) are used in a variety of designs. This raises above all the problem of maintenance. Usually, the TMR are vertically adjusted in height on a profile tube, so that different liquid layers can be mixed by the container. For repair and maintenance, however, the machine is only accessible when the gas chamber is opened by the fermenter. A solution exists for containers with concrete ceiling, which have a ceiling hatch and there can drive the TMR out vertically, but this is not without gas losses when opening. However, there is no currently known possibility of low-gas-loss maintenance in flexible, elastic gas storage with hatch in the vessel wall.

The entry systems in the prior art are generally mixers,

Push floor systems, which in their function as dosing bunker and mixing unit convey the substrate with screws or conveyor belts into the fermentation chamber from the tank.

Another problem is the sand and fine sand introduced into the system either by appropriate process steps after the

Separate fermentation, or to wash the substrate before, which requires a lot of effort. Furthermore, the non-floating sand settles in the container with the years and then has to be removed with costly measures, which can not be done without interruption.

With regard to the ever-increasing requirements for avoidance and

Reduction of waste and pollutants, it is essential to worry about the further degradation of energy-containing substances. For global political and economic reasons, new plant concepts and technologies should be developed to improve the overall balance. At rising

Substrate costs for biomass plants, it is important that the used

Substrates in optimally adapted to the individual process stages conditions, are degraded with a significantly higher degree of degradation. This aspect of better overall utilization of the substrates used is of great importance for the environment and the economic efficiency of the plants. In order to overcome the above-mentioned difficulties in the prior art, one aspect of the present invention is to provide a closed one

Concrete foundations as far as possible.

In doing so, the safety regulations valid for the respective country must be precisely defined when constructing the construction and operating instructions and taken into account in the design.

It is therefore an object of the present invention to provide a container for receiving and fermenting biomass, the simple and simple in construction and safe in operation and maintenance, as well as cost in the

Production is.

This object is solved by the characterizing features of the main claims.

According to the invention, the modular system for creating a biogas fermenter with a biomass receiving container with at least one annular side wall and a roof structure arranged above, and at least one arranged on the inside of the container waterproof layer and a roof structure above the arranged gas storage foil, with the at least one waterproof layer is connected in a gastight manner. The modular system is characterized in particular by the fact that at least part of the container is embedded in a recess in the ground and at the edge of the recess an annular foundation is embedded in the ground on which the annular side wall is arranged.

General description:

The fermenter is manufactured in a modular system in such a way that the individual parts and pre-assembled assemblies fit into a transport system, such as in one or more sea containers. At the construction site this is then set up and mounted with little tools and little technical effort. Also, the proportion of excipients and materials is like Concrete anchors and foundations or ground anchors minimized. Optionally, all necessary tools and assembly tools can complete the delivery.

With the container system according to the invention, a system is provided which manages with low production costs, but still offers a high level of security against leaks and accidents. Not only will the setup be quick and easy, but also the operation and maintenance will be done by trained personnel. All moving parts are easily accessible and easy to handle, and can be moved and maintained without special tools such as cranes or loaders.

For this purpose, it is advantageous that at least one annular side wall at least two, preferably a plurality of straight and / or curved sheet metal elements, for. As planks, which are releasably connected to each other.

Another advantage is seen in the fact that the annular side wall is preferably arranged on an annular, embedded in the ground foundation of concrete.

It is also advantageous that at least a portion of the biomass receiving container is disposed in the ground.

Another advantage is that the Erdausnehmung has sloping walls, so that the Erdausnehmung is formed trapezoidal in cross-section.

It is also advantageous that in the center of the base of the Erdausnehmung a foundation or a suitable ground anchorage is arranged, on which at least one buttress (middle support) rests.

It is also advantageous that at least one of a segment ceiling

Anlagungsfläche for desulfurization of the biogas produced is arranged. It is also advantageous that holding elements are arranged in the upper region of the support pillar, from which radially support elements lead to the upper edge of the annular side wall.

It is also advantageous that at least one submersible mixer is arranged on the circumference of the annular side wall, which is guided on a rail guidance system.

Another advantage is that at the periphery of the cow-shaped side wall at least one sliding floating pad for receiving the

Biomass entry is arranged.

It is also advantageous that the entry system first receives the biomass to be introduced at the bottom and lets it slowly retract into the already existing biomass within hours (about 6 hours).

It is also advantageous that at least one sand trapping device is arranged in the region of the base of the Erdausnehmung.

It is also advantageous that at a suitable location, for. B. in the region of the base of Erdausnehmung, at least one leakage device for controlling the

Tightness of the container film is arranged.

An advantageous embodiment of the modular system, it is further that the

Container film has at least two layers.

It is also advantageous that a heater is integrated into the container film.

The inventive method for producing a biogas plant with at least one container system with at least one container, the

at least one space for biomass, a roof construction and has at least one gas storage film is characterized by the following process steps:

- removing an earth inlay that forms part of a container; and

- Building an annular foundation or

Ground anchoring system, such as e.g. Pile foundation, on the edge of the Erdausnehmung for receiving the annular side wall

- Setting up the annular side wall on the annular foundation or on the appropriate ground anchorage in the edge region of the Erdausnehmung; and

- Laying out the Erdausnehmung together with the annular

Side wall with at least one foil; and

- Attachment of the roof construction in the upper area on at least one buttress; and

- Arrange a gas storage foil above the roof construction.

A significant advantage is that the individual components of the entire modular system can be essentially packed and shipped in a container.

In the following, the modular system according to the invention for the construction of a biogas container for the fermentation of biomass is explained in more detail with reference to drawings. It shows

1 shows a simplified schematic representation of a modular system (1) according to the invention;

2 shows a plan view of the modular system (1) in a simplified representation;

Fig. 3: the basic technical structure of a registration system (16) with a floating pad (17); 4 shows the basic technical structure of a submersible mixer (19) in a maintenance hood (20);

5: a schematic representation of a section of the layers (9 ', 9 ") in FIG

Ground near the Erdausnehmung (2);

Fig. 6: a perspective detail view of the upper edge of the annular side wall (5), which represents the connection between the container film (9 ') and the gas foil (9).

In Fig. 1 is a simplified schematic representation of a

Embodiment of the modular system 1 according to the invention for the preparation of a container for receiving and fermenting a biomass shown. At the edge of the Erdausnehmung 2, which is trapezoidal in cross-section substantially in order to thereby increase the stability of the walls 4, is a

Ground anchoring system, e.g. an annular foundation 7, embedded in the ground 6. The Erdausnehmung 2 is formed from the base 3 and the oblique side walls 4, wherein the base 3 in the present embodiment is a circular horizontal surface of the composition of the soil 6. The side walls of the entire container consist of both the natural walls 3, 4 of the Erdausnehmung 2 and a superposed wall 5 made of steel or the like, such. Wood, the ring of a plurality of individual prefabricated individual pieces, z. As sheets, constructed and assembled and bolted together. They are pre-rolled in the container diameter. The corrosion protection should consist only of a primer, since the outer ring is not in contact with the media, d. H. is not touched by the biomass received in the container.

The bottom attachment of the ring-shaped steel ring 5 takes place with an indicated ring anchor 7 ', which is connected to the concrete foundation 7, that is screwed. The upper container edge of the steel ring 5 closes with a The steel ring 5 contains openings 18 for viewing and control windows, such as manholes and maintenance openings Feedthroughs for the agitators are welded into the steel wall.

In the base 3 of the Erdausnehmung 2 a ground anchorage as a foundation 10 is arranged centrally, on which there is at least one supporting pillar which essentially carries the roof structure 8. Thus, the roof structure 8 is arranged above the steel ring 5, which is composed of a plurality of individual segments 8 'as a ceiling made of wood or straps or ropes, the u.a. serves as an attachment surface for the desulfurization of the generated biogas or methane, wherein the sulfur adhered to the operation of the fermenter mainly on wooden ceilings and then falls into the substrate in solid form. The segmental ceiling can also be designed to be accessible, in order to ensure a trouble-free replacement and construction of the gas foil arranged above it. In addition, this segmental ceiling or roof construction 8 has the task of intercepting any snow load with no or only little gas so as to protect the container contents. At the upper end of the support pillar 11 supporting elements 12 are fixed, which radiate on the edge of the annular side walls 5 made of steel sheets or other material, for. B. wood, lead and fixed there.

Above the roof construction 8, a commercially available spherical segment-shaped biogas storage film 9 is arranged, which collects the biogas produced in the fermenter and thereby inflates. The gas storage foil 9 is optionally equipped with a net cover, not shown, equipped to intercept a possible pressure load can. The gas storage film 9 is largely elastic and is made of a material which is additionally diffusion-tight in order to avoid possible gas leakage losses. The arrangement of a nylon net, which is located above the gas storage foil 9 is to be chosen so that this initially results in a height and volume limitation. At risk of storms and Severe weather is still given the opportunity to straighten the net, so as to avoid weather damage. In general, nets and films are to be used which have both a high tensile strength and elongation, as well as an elongation at break of up to 300%. Furthermore, the film must be gas-tight (diffusion-tight) and can easily be connected to one another and to the lining film in a gastight manner (welding, gluing, interlocking). It is also resistant to extreme environmental influences such as large temperature differences, high UV radiation, storm and hurricane and heavy rainfall / hail.

In this illustration, an agitator 19 is arranged laterally with a so-called. Submersible motor and with a maintenance hood 20, which will be described in more detail below to Fig. 4.

Furthermore, in this illustration on the right side the entry system 16 of the fresh biomass is arranged, which is further described below with reference to FIG. 3.

In the base region of the Erdausnehmung 2 a sand trap 15 is arranged with a centrifugal collector at the periphery of the base 3, which discharges the deposits of contaminants in the container via a pipe 24. The deposits occupy a not inconsiderable storage space and increase the wear of the aggregates in and out of the container. This sand trap 15 generally works by the centrifugal and gravitational force, by which the sand first sinks to the bottom and is circularly purged into the well 24 due to the stirring action of the agitator 19. From here it is possible to suck the material out of the shaft with a suction truck from the outside. The extraction must then take place at regular intervals, so that a large accumulation of sand in the fermenter is excluded.

Furthermore, in the base region of the Erdausnehmung 2 in this illustration on the left side, a leakage control device 14 is arranged with the Any leaks in the container foil 9 ', 9 "can be detected, which represents an important cost saving in the present modular system 1. In this system, the design of the container seal with some additional functions is of crucial importance 45 ° obliquely pulled upwards on the container sidewall 5 and also fastened to the upper edge of the annular sidewall.With the ground installation of the container, no concrete brine is required in the bottom area of the base 3. In the area of the middle support 11, the center support is passed through the foil, eg with a flange connection.

The container film 9 'is laid in duplicate, so that the one side is in contact with the media and the other side, which represents the leakage film 9 ", is located between the container film and the container wall surface two-fold safety to the tightness of the container takes place and on the other hand there is the possibility of leakage of the inner container film immediately after entry of a liquid between the two films 9 ', 9 "to detect. This takes place with the aid of the leakage control device 14 via a shaft 30.

2 shows a schematic plan view of the modular system 1 in an embodiment in which the entry system 16 and the agitator 19 are diametrically opposed. At the periphery of the base 3 of the Erdausnehmung 2 tangentially the sand trap 15 is arranged, the contents of which is discharged through the shaft 24. Of the numerous supporting elements 12, which are part of the roof structure 8, only four are shown symbolically.

FIG. 3 shows a schematic side view of the entry system 16 through which the fresh biomass enters the fermenter. This entry system 16 has an oblique insertion slot 25 which is located above the liquid surface and is gas-tightly separated from the container space by a partition plate 26. The insertion shaft 25 is also the possibility, solid biomass such as solid manure, corn or grass in the fermenter to to lead. In this case, the biomass is tilted into the hopper 25 so that it sinks below the water surface and a float pad 17 is supplied, on which the freshly introduced biomass first comes to rest, so that the biomass accumulates there. Because the filled biomass is now in the liquid (hydrolysis function), a pre-acidification of the material takes place as a function of the residence time. Is this residence time of z. B. 6 hs finished, the floating pad 17 can first be lowered by the air space is relieved in the floating cushion and this falls due to gravity. Now, a portion of the lower biomass can further decrease and be stirred by combined agitator intervals of a second agitator 28 behind a mixing flap 27. A further process step of introducing the biomass is then carried out with the remainder of the biomass in the feed chute 25 in that the stirring mechanism is actuated by actuation of the second agitator 28. In this case, the mixing flap 27 opens due to the resulting flow through the second agitator 28, which is arranged behind the mixing flap 27. The remaining biomass with the turbulent flow in the shaft is now transported into the container and can then be stirred in by the radial flow of the submersible mixer 19 (TMR). After completing this cycle with all its functions, the floating pad 17 can again be pressurized with compressed air and it can be a new filling of the next batch for another day.

4 shows the schematic technical structure of the agitator 19 in a maintenance hood 20. So that the liquid biomass sufficiently homogenized comes in a controlled movement and so the gas production is optimized and the largest possible amount of gas can leak, should with the help of the submersible mixer 19 (TMR ) the biomass are stirred. Since the TMR is within the liquid biomass, it is subject to certain maintenance cycles. During maintenance, however, the gas should not be drained. This means that the TMR must be removed from the liquid biomass, without gas can escape from the gas storage. Therefore, the solution to this problem is to mount the TMR on a rail system 21 place on which it can be variably adjusted in height. The rail system 21 has at the top of a maintenance hood with wall opening. This makes it possible to stir due to the external adjustment in different depths of the container and thereby stir up various sinking or floating layers. The rail system 21 itself is on the one hand attached to the outer shell of the fermenter, on the other hand, the rail system 21 is installed with a large contact surface resting on the film. The rail system has strong connections to the floor and / or wall, so that the film can not be damaged. Therefore, between the rail system 21 and the container film 9 'soft spacers such. B. rubber pad or similar. intended.

The agitator 19 is primarily a submersible mixer, which can be lowered on a rail system 21 into the liquid. As a result, it is possible by the external adjustment to adjust the agitator 19 in different depths of the container, thereby stirring up the auszufaulende biomass in different sink or floating layers. A common problem of such an agitator in a system is in practice the maintenance during operation of the plant, in which the gas storage is filled and can actually be accessed only with a stoppage access to the agitator. To largely avoid such problems during maintenance, a maintenance hood 20 is provided, which is installed in the container gas space. The maintenance hood 20 consists of a downwardly open housing and a flange opening 22 which is opened when the agitator 19 is raised and the agitator 19 is rotated by means of a joint 23 by 180 °, so that the propeller and the submersible motor is freely accessible. When required maintenance work such as oil change, propeller change or replacement of the agitator 19, the agitator on the rail system 21 is driven so far that it enters the maintenance cover 20. The maintenance hood is then lowered, so that it dips into the liquid or biomass with the lower housing part. This creates a separated gas space which is comparatively small, so that the agitator fits straight into it. Now, the flange opening 22 becomes from the outer wall to the former Unscrewed ventilation, so that a free access to the agitator 19 is made possible without the gas production is interrupted in the container. Subsequently, the agitator 19 is rotated out of the container via a rotatable square tube 23, whereby the agitator 19 is accessible outside the container for maintenance. When the agitator 19 is repaired again, it is rotated back again and can be put back into operation in a known manner.

5 shows a schematic representation of a section of the near-earth

Foil design of biogas tank. Because the surface 32 of the

2 and the first container foil 9 ", a leveling foil 33, eg made of foam or non-woven fabric or natural felt, is arranged on the surface 32 of the earth, which compensates for possible unevenness and points In addition, the nonwoven structures are honeycomb-shaped in the form of individual chambers (spatial structures), which has the advantage that any leakage occurring in the film 1 and the resulting leakage of liquid waste in the individual chambers of the nonwoven fabric is collected and the leakage is thereby automatically canceled

Container foil 9 ", which does not come into contact with the biomass, is arranged above the container foil 9", the second container foil 9 ', which comes into direct contact with the biomass to be digested. The material of the films may consist of PVC, PP, PE or multilayer composite films. Between the first and the second container film inevitably results in a very thin layer of air, which communicates with the leakage device 12 in connection to immediately generate a signal after entering a liquid in the gossamer-thin gap. In a further exemplary embodiment, heating and / or cooling coils 34 are integrated between the first container foil 9 "and the second container foil 9 'in order to prevent the

Bring biomass to process temperature. In another embodiment of the heating or cooling water pockets are arranged between the individual films, which are integrated in or on the corresponding film. Both slides They are extremely flexible yet mechanically strong, so that they can adapt to the excavated soil and, if possible, form little or no corners and edges in order to avoid deposits of foreign substances and to be resistant to mechanical pressure loading. The mechanical pressure at the first container foil 9 "is built up when the soil is very rocky and the liquid biomass is in the fermenter, so the foil must be laid so that the pressure built up can not cause the foil to be slow In order to largely compensate for the influence of the flow of the biomass, all the films are attached to the ground surface 32 by suitable means and, in any case, a heat insulation layer is arranged between the container film and the ground. which ensures that

Temperature variations of the soil and / or the atmosphere are largely prevented and can not influence the temperature of the substrate.

Fig. 6 shows a partial perspective view of some details of a technical embodiment of the connection between the gas foil 9 and the container film 9 'at the upper edge of the annular side wall 5. At the upper edge of the annular side wall 5, a first angle member 35 is arranged, which by welding or Bonding is attached to the upper edge of the side wall 5. In this case, the angle element 35 is bent in the container radius of the annular side wall 5. In addition, a second angle element 36 is arranged, which also, in the

Container radius is bent and e.g. positively connected at the edge, wherein both angle elements 35, 36 'in each case in the outwardly facing legs 37, 37' have bores 38 which receive a screw 39, so that there is a horizontal flange.

Between the leg 37 and 37 'of the two angle elements 35, 36, the container film 9' is clamped over the container edge, so that a gas-tight

Connection between the container film 5 and the angle elements 36, 37 is made. The screwing is done with the screw 39th The other Leg of the second angle member 36 has in certain distances inwardly facing semicircular eyelets 40 through the openings at least one tensioning cable 41 is guided, which serves both for fastening the support members 12 and the sulfur network (not shown). For this purpose, a tube sleeve 42 are clamped over the tensioning cable 41 so that the inner tensioning cable 41 is pulled slightly radially into the center of the container. The tensioning cable 41 is slightly biased with clamping screws, not shown here.

Once the support members 12 and the sulfur network are well lashed, then a predetermined final tension can then be applied to the support members 12 by the wire rope tension of the tensioning cable 41 with the

Clamping screws is increased so that the support members 12 are pulled radially outward so as to be fully stretched. The tubular sleeves 42 reduce the friction of the tensioning cable 41 and thereby avoid a possible notch stress in the connection.

On the end of the upward-pointing leg of the second angle element 36 a bent in the radius of the container curvature tube 43 is arranged, via which the gas roof foil 9 is placed. Underneath the bent tube 43 is a tensioning cable 44, which is of a resilient sheath, e.g. Rubber is surrounded, arranged. The tensioning cable 44 encloses the entire circumference of the container, or the annular side wall 5 and thus gas-tight fixes the gas roof foil 9 at the upper edge of the annular side wall 5 of the container. Due to the overlapping overlap of the gas roof foil 9 on the circumference of the container, the system is securely sealed gas-tight below the tube 43. In order to build up a sealing tangential stress, the inner wire rope 41 is tightened mechanically again with an outward clamping screw. As a result, a quick assembly and disassembly of the gas foil 9 and the overlying storm protection network is possible, which is generally arranged above the gas roof foil 9 and attached to additionally mounted eyebolts outside and with a turn

is lashed all-round tensioning cable.

Claims

1. Modular system (1) for creating a biogas fermenter with a biomass receiving container with at least one annular side wall (5) and a roof structure arranged above (8), and at least one arranged on the inside of the container waterproof layer (9 ') and one above the roof structure (8) arranged gas storage film (9) which is gas-tightly connected to the at least one watertight layer (9 '), characterized Porsche Style nzeichnet that at least a part of the container in a recess (2) in the ground (6) is embedded and at the edge of the recess (2) an annular ground anchoring (7) in the ground (6) is embedded, on which the annular side wall (5) is arranged,

2. Modular system (1) according to claim 1, characterized

characterized in that the annular side wall (5) at least two, preferably a plurality, straight and / or curved elements (5 '), z. As planks of steel or wood, which are interconnected.

3. Modular system (1) according to claim 1, characterized

characterized in that the annular, embedded in the ground foundation (7) is preferably made of concrete.

4. Modular system (1) according to claim 1, characterized

in that the Erdausnehmung (2) is trapezoidal in cross-section.

5. Modular system (1) according to claim 1, characterized

characterized in that the center of the base (3) of the

Erdausnehmung (2) a further ground anchoring, preferably a second foundation (10) is arranged on the at least one

Supporting element (11) (central support) is frictionally arranged with a flange through the bottom sheet.

6. Modular system (1) according to claim 1, characterized

in that at least one abutment surface for desulfurization of the generated biogas is arranged on the segmental ceiling (8 ').

7. Modular system (1) according to claim 1, characterized

characterized in that in the upper region of the support element (11) are arranged in a ring-shaped holding elements, from which radially support elements (12) to the upper edge of the annular side wall (5).

8. Modular system (1) according to claim 1, characterized

characterized in that at least one submersible mixer (19) which is guided on a rail guidance system (21) is arranged on the circumference of the annular side wall (5).

9. Modular system (1) according to claim 1, characterized

characterized in that at least one displaceable floating pad (17) is arranged on the circumference of the cow-shaped side wall (5) for receiving the biomass entry.

10. Modular system (1) according to claim 1, characterized

characterized in that in the region of the base (3) of the Erdausnehmung (2) at least one sand trap device (15) is arranged.

11. Modular system (1) according to claim 1, characterized

characterized in that at a suitable location, for. B. in the region of the base (3) of the Erdausnehmung (2), at least one leakage device (14) for checking the tightness of the container film (9 ', 9 ") is arranged.

12. Modular system (1) according to claim 15, characterized

characterized in that the container film has at least two layers (9 ', 9 ").

13. Modular system (1) according to one of the preceding claims,

characterized in that a heating or cooling between or on the container foils (9 ', 9 ") is integrated.

14. Modular system (1) according to one of the preceding claims,

characterized in that the gas roof foil (9) with the container film (9 ') by the interaction of at least two

Cable pulls (12, 41) are connected to each other in a gastight manner.

15. A process for producing a Bigas plant with at least one

Container system with at least one container, the at least one space for receiving biomass, a roof construction (8), and at least one gas storage film (9), characterized

in that to create the container in the

Cross-section trapezoidal Erdausnehmung (2) is erected, at the edge region of an annular side wall (5) is placed; and - the Erdausnehmung (2) together with the annular side wall (5) on the inside with at least one film (9 ', 9 ") is designed;

- The roof structure (8) on at least one support element (11) is mounted supporting in the upper region; and

- Above the roof construction (8) a gas storage sheet (9) is arranged.

16. The method according to claim 15, characterized in that the individual components of the entire container system (1) can be packed and shipped substantially in a container.

17. The method according to claim 15, characterized in that the entry system (16) initially receives the biomass to be introduced in the lower area and lets it be slowly introduced within hours (about 6 hours) into the already existing biomass.