KR101967655B1 - Solid state anaerobic digestion method and apparatus for low water content biomass - Google Patents

Abstract

The present invention relates to a method for energizing a low water biomass having a TS content of 15% or more, and an apparatus thereof, and more particularly, to a solid state anaerobic digestion method, which solves problems of a long retention and stirring time, digestion liquid circuition impediment, accumulation of impediment factors such as ammonia and heavy metals, generated when a solid state anaerobic digestion technique is applied to a low water biomass. According to the present invention, in the production of biomethane and manure or a solid fuel using the solid state anaerobic digestion technique which is a process of energizing low water biomass having the high TS content, a problem of the solid state anaerobic digestion is overcome, and a stable continuous operation can be performed while maximizing advantages. Therefore, energy is maximally recovered through the solid state anaerobic digestion in terms of securing new regenerative energy and performing recycling from livestock excretions, and manure or solid fuel are produced through reduction and stabilization, thereby more smoothly treating waste and producing energy, and properly responding to the climatic change convention.

Description

Technical Field [0001] The present invention relates to a solid-phase anaerobic digestion method and apparatus for low-function biomass,

The present invention relates to a method and an apparatus for energizing a low-function biomass having a TS content of 15% or more, and more particularly, to a method and an apparatus for energizing a low-function biomass having a TS content of 15% The present invention relates to a solid-phase anaerobic digestion method and apparatus for improving the problems of inhibiting circulation, accumulation of inhibitory factors such as ammonia and heavy metals.

Generally, organic wastes with a high water content have been treated mainly with landfill or marine dumping due to treatment costs and environmental problems. However, interest in new biomass energy is increasing as the continuous landfill ban, the prohibition of marine dumping in accordance with the London Convention, and the reduction of carbon dioxide in accordance with the Convention on Climate Change are becoming important issues for sustainable renewable energy resources. In particular, it is necessary to develop energy conversion technology for low-function biomass (TS 15% or more), which has a high organic matter content and relatively low water content like livestock manure.

At present, livestock manure recycling, which is a typical low-function biomass with a TS content of 15% or more, is mainly based on livestock manure removal and livestock rearing based on the agricultural land reduction system. In the livestock farming area, If the amount of the fertilizer component originating from the plant is exceeded, there is a fear of contamination of the agricultural environment. In addition, it is not easy to control the odor generated in the reclamation and liquefaction process, and since demand for reclaiming and liquefaction is concentrated in spring and fall, production is continuously produced throughout the year, It is difficult to secure facilities. Also, due to the difficulty in maintaining stable quality and the price hike of the moisture control agent, composting sales are showing sluggishness due to the reversal phenomenon that the fertilizer / fertilizer is sold at a higher price than the chemical fertilizer. Therefore, fundamental measures at the national level are necessary.

Domestic livestock manure biogasification facilities are mainly wet anaerobic digestion system, which mainly uses pig manure with TS content of less than 5%. It treats biomass with high TS content through merging digestion, There is a limit. Most of the livestock manure with high TS content is recycled as compost, and the anaerobic digestion system for energy is not commercialized in Korea.

Solid-phase anaerobic digestion can treat more organic matter per unit volume than conventional wet anaerobic digestion technology, and can be applied immediately without special pretreatment, and biomethane production efficiency is high. However, in spite of these excellent merits, it takes a long time to reach the inoculation and stable operation of the initial anaerobic digestive microorganism, takes about 3 times longer stay time, and it is difficult to accumulate and stir the anaerobic digestion inhibitor, There is a problem that the contact and the impermeable layer inhibit circulation of the digestive juice.

On the other hand, Korean Patent No. 10-1769988 adopts a method in which an anaerobic digestion liquid of a liquid anaerobic digestion tank is supplied to a solid-phase anaerobic digestion tank and a digested anaerobic digestion liquid is transferred to a liquid anaerobic digestion tank. However, in addition to the anaerobic digestion liquid digested in the solid-phase anaerobic digestion tank, the liquid anaerobic digestion tank receives liquid organic waste through a liquid organic waste supply pipe connected to the upper part. This is because only the supply of digested anaerobic digestion liquid in the solid-phase anaerobic digestion tank is insufficient and there is a problem that new liquid organic waste must be supplied continuously.

KR 10-0453418 B1 KR 10-1769988 B1

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a method for producing biomethane, compost or solid fuel using solid-phase anaerobic digestion technology, which is a process of energizing low-function biomass having high TS content, It is an object of the present invention to provide a solid-phase anaerobic digestion method and device for low-function biomass capable of overcoming problems and maximizing advantages and stably operating continuously.

To achieve the above object, according to the present invention, there is provided a solid-phase anaerobic digestion apparatus for low-function biomass, comprising: a mixing tank for mixing an organic waste and a digestive juice to produce a mixture; A wet anaerobic digester reactor for performing microbial culture and organic matter removal through anaerobic digestion of digestive juice; And a solid anaerobic digestion reactor for performing anaerobic digestion reaction by mixing the mixture produced in the mixing tank and the digestion liquid into which the microbial culture and the organic matter removal treatment in the wet anaerobic digestion reactor are mixed, The solid-phase anaerobic digestion reactor includes an inlet for introducing a mixture of organic waste and digestive juice (hereinafter referred to as "mixture"); A digestive juice inlet pipe into which digestive juice is injected and moves vertically downward; A plurality of injection nozzles uniformly distributed over the entire length of the digestive liquid inlet tube; A rotating body which rotates about the digestive liquid inlet pipe and transfers the mixture and the extinguishing liquid injected from the injection nozzle to the lower part and mixes the mixture with the injected digestive juice to cause a primary anaerobic digestion reaction; And a stirring device for stirring the primary anaerobically digested reactant in the rotating body to generate a secondary anaerobic digestion reaction.

The digestion liquid discharged during the anaerobic digestion reaction in the solid-phase anaerobic digestion reactor may be recovered in the wet anaerobic digestion reactor.

The solid-phase anaerobic digestion reactor may have a vertical structure in which the mixture and the digestive juice are mixed while moving down to anaerobic digestion.

Wherein the solid anaerobic digestion apparatus for the low-function biomass further comprises a solid-liquid separator for separating solids and liquid from digestion residues finally discharged from the solid-phase anaerobic digestion reactor, wherein the liquid separated from the solid- It can be recovered in the anaerobic digestion reactor.

The solid-phase anaerobic digester for low-function biomass may further include a biogas reservoir for storing biogas generated in each of the solid-phase anaerobic digestion reactor and the wet anaerobic digestion reactor.

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According to another aspect of the present invention, there is provided a solid-phase anaerobic digestion reactor for anaerobic digestion of low-function biomass, comprising: an inlet for introducing a mixture of organic waste and digestive juice (hereinafter referred to as "mixture"); A digestive juice inlet pipe into which digestive juice is injected and moves vertically downward; A plurality of injection nozzles uniformly distributed over the entire length of the digestive liquid inlet tube; A rotating body which rotates about the digestive liquid inlet pipe and transfers the mixture and the extinguishing liquid injected from the injection nozzle to the lower part and mixes the mixture with the injected digestive juice to cause a primary anaerobic digestion reaction; And a stirring device for stirring the primary anaerobically digested reactant in the rotating body to generate a secondary anaerobic digestion reaction.

Wherein the solid-phase anaerobic digestion reactor comprises an inner wall in the form of a mesh net, among the double walls installed around the rotary body; And a liquid separating pipe for vertically moving the extinguishing liquid moving through the rotating body as a space between the inner wall and the outer wall of the double wall.

The solid-phase anaerobic digestion reactor may further include a digestive liquid recovery pipe connected to the liquid separation pipe at a lower portion of the liquid separation pipe and transferring the digested liquid moving down through the liquid separation pipe to the wet anaerobic digestion reactor .

The solid-phase anaerobic digestion reactor may further include a transfer device for causing movement of the digested residue so that the digested residue left on the lower inclined surface of the solid-phase anaerobic digestion reactor moves to the outlet of the lower stage while rotating.

The solid-phase anaerobic digestion reactor may further include a bridge breaker for preventing digestion residue discharged from the lower end of the solid-phase anaerobic digestion reactor from being blocked at the exhaust port.

The solid-phase anaerobic digestion reactor may further include a digested residue transfer pump for transferring the digested residue from the outlet to the solid-liquid separator.

According to the present invention, in the production of biomethane and compost or solid fuel using solid-phase anaerobic digestion technology, which is a process of energizing low-function biomass having a high TS content, it is possible to overcome the problems of solid-phase anaerobic digestion, There is an effect of providing a solid-phase anaerobic digestion method and apparatus for low-function biomass capable of stable continuous operation.

In addition, the digestion liquid is sufficiently re-supplied to the wet anaerobic digestion reactor through an effective digestion reaction in the solid-phase anaerobic digestion reactor, sufficient liquid is supplied without continuously supplying new liquid organic waste to the wet anaerobic digestion reactor, It is possible to continuously provide it to the solid-phase anaerobic digestion reactor.

In addition, from the viewpoint of securing renewable energy and recycling of livestock manure, it is possible to recover the maximum energy through solid-phase anaerobic digestion and produce compost or solid fuel through reduction and stabilization, thereby further improving waste disposal and energy production, It is possible to appropriately deal with the convention.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the construction and treatment process of a solid-phase anaerobic digester for low-function biomass according to the present invention; FIG.
2 is a view showing the internal structure of a solid-phase anaerobic digestion reactor, which is one component of a solid-phase anaerobic digestion apparatus for low-function biomass of the present invention.
FIG. 3 is a view showing the reaction zone of the solid-phase anaerobic digestion reactor in a separated manner. FIG.
FIG. 4 is an enlarged view showing a connection portion between an upper rotating body and an outer wall of a reactor of a solid-phase anaerobic digestion reactor. FIG.
5 is an enlarged view of the structure of the lower portion of the reactor of the solid-phase anaerobic digestion reactor.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms and words used in the present specification and claims should not be construed as limited to ordinary or dictionary terms, and the inventor should appropriately interpret the concepts of the terms appropriately It should be interpreted in accordance with the meaning and concept consistent with the technical idea of the present invention based on the principle that it can be defined. Therefore, the embodiments described in this specification and the configurations shown in the drawings are merely the most preferred embodiments of the present invention and do not represent all the technical ideas of the present invention. Therefore, It is to be understood that equivalents and modifications are possible.

FIG. 1 is a block diagram showing the construction and treatment process of a solid-phase anaerobic digestion apparatus 100 for low-function biomass according to the present invention.

Biomass, a low-moisture organic waste having a TS content of 15% or more, is supplied to a mixing tank (110) for mixing with a digestion liquid at a predetermined ratio, and the primary microorganism is inoculated by a digestive juice. The mixture of digested liquid and low-function biomass is introduced into the solid-phase anaerobic digestion reactor 130, and anaerobic digestion is performed while mixing with the digestive juice on the rotating body, while the digestive juice, which is separated through the mesh, And is recovered in the reactor 120 to undergo microbial culture and organic matter removal through anaerobic digestion.

The final digestive juice, which has undergone microbiological culture and organic matter removal through anaerobic digestion in the wet anaerobic digestion reactor 120, is supplied to the mixing vessel 110 and the solid-phase anaerobic digestion reactor 130 again. As described later with reference to FIG. 2, a sufficient digestion liquid can be re-supplied to the wet anaerobic digestion reactor 120 by an effective digestion reaction in the solid-phase anaerobic digestion reactor 130, The digester can be continuously supplied to the solid-phase anaerobic digestion reactor 130 without continuously supplying new liquid organic wastes.

The solid residue and the liquid are separated through the solid-liquid separator 140, and a part of the recovered liquid is sent back to the wet anaerobic digestion reactor 120, And sent to the treatment plant 400, where wastewater treatment is performed.

The digested solids recovered through the solid-liquid separator (140) can be finally utilized through the composting or fueling facility (300).

The biogas generated in each of the solid-phase anaerobic digestion reactor 130 and the wet anaerobic digester 120 is stored in the biogas storage tank 150, and the stored biogas is used in the utilization facility 200.

Hereinafter, the configuration and operation of the solid-phase anaerobic digestion reactor 130 will be described in detail.

FIG. 2 is a view showing the internal structure of the solid-phase anaerobic digestion reactor 130, which is a component of the solid-phase anaerobic digestion apparatus 100 for low-function biomass.

The solid-phase anaerobic digestion reactor (130) of the present invention employs a vertical reactor type to overcome the problems of conventional anaerobic digestion technology applied to anaerobic digestion of biomass having a TS content of 15% or more, The solid-phase anaerobic digestion reactor 130 designed to be evenly distributed on the rotating body 133 is used. That is, the organic waste (biomass) and the digestive juice are injected from the top, and the anaerobic digestion reaction is carried out downward, so that it takes the form of a 'vertical type' reactor.

It is difficult to inactivate anaerobic digestion microorganisms by activating anaerobic digestion microorganisms because the biomass is present in a solid state in the solid phase anaerobic digestion of low function biomass with TS content of 15% or more. In the present invention, as described above with reference to FIG. 1, the low-function biomass is first mixed with the digestive juice at a certain ratio in the mixing tank 110 and then introduced.

The solid-phase anaerobic digestion reactor (130) is configured such that a mixture (10) of organic waste and a digestive liquid is introduced into the center of a rotating body (133) that slowly rotates inside a mathematical reactor, and a crusher 131). This organic waste mixture 10 is slid downwardly on the rotating rotating body 133 gradually. In one embodiment, the rotating body 133 may be formed in a gently inclined spiral shape, and the charged mixture 10 may be transferred to the lower portion while being rotated around the digestive fluid inlet pipe 132.

The digestive liquid 11 is introduced into the digestive liquid inlet pipe 132 vertically installed in the center of the solid phase anaerobic digestion reactor 130 and the injected digestive liquid is uniformly distributed over the entire surface of the digestive liquid inlet pipe 132, (132.3) to the organic waste mixture (10) on the rotating body (133). This facilitates the contact of organic matter in the digestive juices and overcomes the problem of inoculation of the early anaerobic digestive microorganisms. That is, the spraying of the extinguishing liquid through the plurality of spray nozzles 132.3 uniformly distributed over the entire surface of the extinguishing liquid inlet pipe 132 causes the organic waste, which gradually slides downwardly on the rotating body 133, , It is possible to overcome the problem of microbial inoculation and microbial organic matter contact, agitation, and impermeable layer formation, thereby making the state of anaerobic digestion well.

The mixture 10 is mixed with the digestive juice through the tilting and rotating force of the rotating body 133 to allow the anaerobic digestion to proceed well through the inoculation and contact of the microorganisms and the solid phase biomass mixture 10 are moved slowly to the lower part of the solid-phase anaerobic digestion reactor 130 while mixing with the injected digestive juice.

The digestive juice is mixed with the solid phase biomass on the rotating body 133 and moves down toward the mesh network 134 on the inner wall of the solid phase anaerobic digestion reactor 130 having the double wall structure while descending the rotating body 133. The liquid (extinguishing liquid) exits through the mesh network 134 on the inner wall of the solid-phase anaerobic digestion reactor 130. The liquid that has escaped moves vertically downward through the liquid separation pipe 135, And the solid biomass is continuously contacted with the digested liquid injected through the injection nozzle 132.3 on the rotating body 133 to inoculate the microorganisms and mix the anaerobic digestion It proceeds. That is, biological solubilization, acid fermentation, and anaerobic digestion are performed in the first anaerobic digestion reaction on the upper part of the solid-phase anaerobic digestion reactor 130, that is, on the rotating body 133.

As described above, organic wastes slid downward gradually on the rotating body 133 are sprayed through the injection nozzle 132.3, which is uniformly distributed over the entire surface of the digestive liquid injection pipe 132, The amount of the digestion liquid that is discharged from the wet anaerobic digestion reactor 120 through the mesh network 134 on the inner wall of the solid phase anaerobic digestion reactor 130 The wet anaerobic digester reactor 120 can continuously supply the digester to the solid-phase anaerobic digestion reactor 130 without continuously supplying new liquid organic wastes.

Below the solid-phase anaerobic digestion reactor 130, there is a stirring device 137 and a transfer device 138.1 capable of transferring the digested residue to the outlet of the lower end of the solid-phase anaerobic digestion reactor 130.

The first anaerobically digested digestion material is transferred to the bottom of the solid-phase anaerobic digestion reactor (130) at the upper part of the solid-phase anaerobic digestion reactor (130), and the most part of methane fermentation is performed through mechanical mixing in the agitator Of biogas is produced. That is, by mixing with the stirring device 137, full-scale methane fermentation occurs during a short residence time of about 10 days to produce biogas. Therefore, it is possible to overcome the problems of conventional solid-phase anaerobic digestion in one reactor (130). The biogas generated in the solid phase anaerobic digestion reactor 130 is transferred to the biogas storage tank 150 through the biogas recovery pipe 40 at the upper part of the solid phase anaerobic digestion reactor 130.

In addition, it is possible to maintain the reaction temperature of the solid-phase anaerobic digestion through digestive juice circulation and prevent the accumulation of inhibitory substances. In addition, wet anaerobic digestion using digestive juices can be used to treat digestive organic matter, anaerobically digest microbes, and control inhibitory factors.

The transfer device 138.1 rotates while moving the fire extinguishant so that the fire extinguishing residues that fall on the lower inclined surface of the solid-phase anaerobic digestion reactor 130 move to the outlet of the lower end, and the bridge breaker 138.2 installed at the exit port, The digested residue discharged from the anaerobic digestion reactor 130 is prevented from being clogged at the discharge port and the digested residue transfer pump 30 transfers the digested residue from the discharge port to the solid-liquid separator 140.

FIG. 3 is a view showing the reaction zone of the solid-phase anaerobic digestion reactor 130 in a separated manner.

The solid-phase anaerobic digestion reactor 130, which has already been described in detail with reference to FIG. 2, is roughly divided into two parts based on the reaction area.

Referring to FIG. 3, the upper portion of the solid-phase anaerobic digestion reactor 130 is a large rotating body 133 closely contacting the mesh network 134 in the reactor as described above with reference to FIG. 2, The solid mixture introduced into the solid-phase anaerobic digestion reactor 130 through the digestion liquid discharged from the central digestion liquid inlet pipe 132 is repeatedly stirred and contacted with the microorganisms in the inoculation and primary anaerobic digestion.

The lower part of the solid-phase anaerobic digestion reactor 130 is provided with a stirring device 137 and a transfer device 138.1 (refer to FIG. 2). Biological solubilization and anaerobic digestion (acid fermentation, Methane fermentation) reaction is used to perform mechanical agitation by the agitation device 137 in the lower part of the solid-phase anaerobic digestion reactor 130 and the second anaerobic digestion Digestion is done.

4 is an enlarged view showing a connection portion between an upper rotating body of the solid-phase anaerobic digestion reactor 130 and an outer wall of the reactor.

As shown in FIG. 4, the upper rotating body 133 and the mesh mesh 134 have a first blocking portion 132.1 to block the solid mixture 10 from falling down below the rotating body 133, And is discharged through the net 134, so that solid-liquid separation is possible. In addition, a second blocking portion 132.2 is provided so as to receive the extinguishing liquid falling downward from the rotating body 133 and to be discharged through the mesh net 134 in order to prevent the fire extinguishing liquid from falling down to the lower portion of the reactor. Through this structure, the solid mixture (10), which is a subject of anaerobic digestion, can stay in the rotating body (133) for a certain residence time and improve the efficiency of anaerobic digestion by improving microbial inoculation and contact through continuous mixing with digestive juice, And is prevented from flowing into the secondary anaerobic digestion zone in the lower part of the solid-phase anaerobic digestion reactor 130 without being affected.

FIG. 5 is an enlarged view of the structure of the lower portion of the reactor of the solid-phase anaerobic digestion reactor 130, with the dotted line portion being enlarged and viewed from above.

The transfer device 138.1 is a device for smoothly discharging digested residues after completion of the solid-phase anaerobic digestion. The transfer device 138.1 causes movement of the digested residues so that the digested residues separated from the inclined surfaces move to the lower outlet 139, And the lower discharge port 139 along the inclined surface. Also, it can be used to mix the solid phase mixture under the solid-phase anaerobic digestion reactor 130 where the second anaerobic digestion proceeds through the rotation direction control.

10: Mixture of organic waste (biomass) and digestive juice
11: Fire extinguisher
20: Mixture input tube
30: Extinguishing residue transfer pump
40: Biogas recovery pipe
100: Solid-phase anaerobic digester for low-function biomass
110: mixing tank
120: Wet anaerobic digestion reactor
130: Solid phase anaerobic digestion reactor
131: Crusher
132: Digestive fluid input tube
132.1:
132.2:
132.3: injection nozzle
133: rotating body
134: mesh network
135: liquid separation pipe
136: Digestive fluid collection tube
137: stirring device
138.1: Feeding device
138.2: bridg breaker
139: Outlet
140: Solid-liquid separator
150: biogas
200: Biogas utilization facility
300: Composting or solid fueling facility
400: Wastewater treatment plant

Claims (16)

As a solid-phase anaerobic digester for low-function biomass,
A mixing tank for mixing the organic waste (biomass) and digestive liquid to produce a mixture;
A wet anaerobic digester reactor for performing microbial culture and organic matter removal through anaerobic digestion of digestive juice; And
A mixture produced in the mixing tank and a digestion liquid in which the microbial culture and the organic matter removal treatment are performed in the wet anaerobic digestion reactor are mixed and the anaerobic digestion reaction is performed by mixing the mixture with the digestion liquid,
Lt; / RTI >
Wherein the solid-phase anaerobic digestion reactor comprises:
An inlet for introducing a mixture of organic waste and digestive liquid (hereinafter referred to as "mixture");
A digestive juice inlet pipe into which digestive juice is injected and moves vertically downward;
A plurality of injection nozzles uniformly distributed over the entire length of the digestive liquid inlet tube;
A rotating body which rotates about the digestive liquid inlet pipe and transfers the mixture and the extinguishing liquid injected from the injection nozzle to the lower part and mixes the mixture with the injected digestive juice to cause a primary anaerobic digestion reaction; And
An agitator for generating a secondary anaerobic digestion reaction by agitating the primary anaerobically digested reactant in the rotating body,
/ RTI >
Solid - phase anaerobic digester for low - function biomass. The method according to claim 1,
The digestion liquid discharged during the anaerobic digestion reaction in the solid-phase anaerobic digestion reactor is recovered in the wet anaerobic digestion reactor
Characterized in that the anaerobic digester is a solid anaerobic digester for low-function biomass. The method according to claim 1,
Wherein the solid-phase anaerobic digestion reactor comprises:
Having a vertical structure in which the mixture and the digestive juice are mixed while moving downward and anaerobic digestion is carried out
Characterized in that the anaerobic digester is a solid anaerobic digester for low-function biomass. The method according to claim 1,
A solid-liquid separator for separating the solid and the liquid from the digested residue finally discharged from the solid-phase anaerobic digestion reactor
Further comprising:
The liquid separated in the solid-liquid separator is recovered in the wet anaerobic digestion reactor
Characterized in that the anaerobic digester is a solid anaerobic digester for low-function biomass. The method according to claim 1,
A biogas storage tank for storing biogas generated in each of the solid-phase anaerobic digestion reactor and the wet anaerobic digestion reactor
Further comprising a second anaerobic digester for the low-function biomass. delete delete delete delete delete A solid-phase anaerobic digestion reactor for anaerobic digestion of low-function biomass,
An inlet for introducing a mixture of organic waste and digestive liquid (hereinafter referred to as "mixture");
A digestive juice inlet pipe into which digestive juice is injected and moves vertically downward;
A plurality of injection nozzles uniformly distributed over the entire length of the digestive liquid inlet tube;
A rotating body which rotates about the digestive liquid inlet pipe and transfers the mixture and the extinguishing liquid injected from the injection nozzle to the lower part and mixes the mixture with the injected digestive juice to cause a primary anaerobic digestion reaction; And
An agitator for generating a secondary anaerobic digestion reaction by agitating the primary anaerobically digested reactant in the rotating body,
Wherein the solid-phase anaerobic digestion reactor is a solid-phase anaerobic digestion reactor. The method of claim 11,
An inner wall in the form of a mesh net among the double walls installed around the rotating body; And
A liquid separating pipe for vertically moving the extinguishing liquid moving through the rotating body as a space between the inner wall and the outer wall of the double wall,
Further comprising a second anaerobic digestion reactor. The method of claim 12,
A liquid separation pipe connected to the liquid separation pipe at a lower portion of the liquid separation pipe, for transferring the digested liquid moving down through the liquid separation pipe to the wet anaerobic digestion reactor,
Further comprising a second anaerobic digestion reactor. The method of claim 11,
A conveying device for causing movement of the digested residue to move the digested residue left on the lower inclined surface of the solid-phase anaerobic digestion reactor to the lower outlet
Further comprising a second anaerobic digestion reactor. The method of claim 11,
A bridge breaker that serves to prevent the digestion residue discharged from the bottom of the solid-phase anaerobic digestion reactor from clogging at the outlet,
Further comprising a second anaerobic digestion reactor. The method of claim 11,
A digester residue transfer pump that transfers the digestion residue from the outlet to the solid-liquid separator
Further comprising a second anaerobic digestion reactor.

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