JP2020138121A - Processing apparatus for converting refuse to biogas and processing method for converting refuse to biogas - Google Patents

Abstract

To provide a method and an apparatus for reducing various costs including an apparatus manufacturing cost, an energy cost, and a running cost by eliminating the necessity of a drying step of a product material of a refuse by hydrolysis using steam, a pellet molding step, and an exhaust gas processing step by burning of a pellet.SOLUTION: A processing apparatus 1 for converting a refuse to biogas by hydrolysis treatment of a raw material containing an organic refuse is assembled with: a hydrolysis apparatus 2 assembled with a treatment container 23 including a raw material feed port 21 and a product material exhaust port 22, agitation means provided inside of the treatment container 23 for agitation of a raw material, a steam supply piping 24 for supplying steam to the treatment container 23, a steam exhaust pipeline 26 for exhausting steam from the treatment container 23; and a biogas conversion and recovery apparatus 3 for converting a product material having been through a hydrolysis treatment to a biogas and a recovering the same.SELECTED DRAWING: Figure 1

Description

The present invention relates to a waste gasification treatment apparatus, a waste gasification treatment system, and a waste gasification treatment method.

The invention of Patent Document 1 is a method for producing a product by hydrolyzing a raw material containing vegetable waste with steam to produce a product, which comprises a hydrolysis treatment step of hydrolyzing the raw material with steam. A washing step of washing the hydrolyzed raw material with a washing liquid and a separation step of separating the washed raw material into a solid content and a liquid content are included, and at least one of the solid content or the liquid content is used. It is characterized in that it is the product. A drying step of drying the solid content includes a molding step of pelletizing the solid content, and a biomass fuel is produced from the solid content.

The invention of Patent Document 2 is a hydrolysis treatment apparatus for hydrolyzing a raw material containing an organic waste, which is provided in a processing container having a raw material input port and a product discharge port, and a raw material provided inside the processing container. The processing container is provided with a stirring means for stirring the above, a steam supply pipe for supplying steam to the processing container, and a steam exhaust pipe for discharging steam from the processing container, and the processing container has a plurality of steam supply ports. is there.

Japanese Patent No. 6190802 Japanese Patent No. 6409237

However, since the method for producing a product described in Patent Document 1 and the hydrolysis treatment apparatus described in Patent Document 2 utilize the solid content or the liquid content obtained by hydrolyzing the waste, the solid content and the liquid content are used. It is necessary to separate the solid and liquid. In the cases of Patent Documents 1 and 2, the main purpose is to use the solid content, and since the process of drying the hydrolyzed solid content and the step of pellet forming are required, the apparatus manufacturing cost and the energy cost of the process become large. There are problems to be solved, such as a long treatment time and the need for pollution prevention treatment of exhaust gas by burning solid content.

The present invention has been made in view of the above problems, and by eliminating the steps of drying the product of hydrolysis of waste by steam, pellet forming step, and treating exhaust gas by burning pellets. The purpose is to reduce various costs such as equipment manufacturing cost, energy cost, and running cost.

The present invention comprises a processing container having a raw material input port and a product discharge port, a stirring means provided inside the processing container for stirring raw materials, a steam supply pipe for supplying steam to the processing container, and the processing. It is provided with a hydrolysis device having a steam exhaust pipe for discharging steam from a container and a biogasification recovery device for biogasifying the product discharged from the product discharge port and recovering the generated biogas. It is a characteristic waste biogasification treatment device.

Further, in the present invention, a raw material charging step of charging a raw material containing organic waste into a processing container, a hydrolysis treatment step of hydrolyzing the raw material with steam, and a bio product produced in the hydrolysis treatment step are biogasified. It comprises a biogasification recovery step of gasifying and recovering, and in the hydrolysis treatment step, the internal pressure of the treatment container is 1.2 MPa to 3.0 MPa, the treatment temperature is 189 to 234 ° C., and the treatment temperature is the target temperature. It is a waste biogasification treatment method characterized in that the holding time after reaching the zone is 10 minutes to 2 hours.

A waste gasification treatment system including a hydrolysis treatment device, a biogasification recovery device, and a biomass boiler that generates steam using organic substances as fuel. The biomass boiler is hydrolyzed by the hydrolysis treatment device. The fuel may be obtained by drying the treated product to a water content of 20% or less.

The biomass boiler includes a fuel supply port for supplying the fuel, and the fuel supply port may be connected to an discharge port of a drying device for drying the product.

The waste biogasification treatment method of the present invention comprises a raw material charging step of charging the raw material into the processing container and then closing the processing container in a closed state, and supplying steam to the processing container from a plurality of positions to pressurize the material. After the pressurizing and raising step of raising the temperature, the temperature holding step of holding the temperature after the inside of the processing container reaches the target temperature zone, and the pressurizing and raising step and the temperature holding step, the processing container A steam exhaust step for exhausting internal steam, a product discharge step for discharging the hydrolyzed raw material inside the processing container as a product, and a biogas produced by biogassing the product. It includes a biogasification recovery step for recovery.

It is preferable to stir the raw material in the processing container by a stirring means when the raw material is put into the processing container, when the temperature inside the processing container is heated, and when the inside of the processing container is held after reaching the target temperature zone. ..

According to the present invention, by eliminating the drying step of the product of hydrolysis by steam of waste, the pellet forming step, and the treatment of exhaust gas by burning pellets, the equipment manufacturing cost, energy cost, running cost, etc. Various costs can be reduced. In addition, the generated biogas can generate electricity. Further, by lowering the decomposition temperature at the time of hydrolysis and lengthening the temperature holding time (decomposition time), carbonization of waste that hinders biogasification can be reduced.

It is a block diagram of the waste biogasification treatment apparatus which concerns on embodiment of this invention. It is a flowchart of the waste biogasification treatment method which concerns on embodiment of this invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

The product waste biogasification treatment apparatus 1 according to the embodiment of the present invention includes a hydrolysis apparatus 2 for producing a product by hydrolyzing a raw material containing an organic waste with steam, and a hydrolysis apparatus 2. The biogasification recovery device 3 that receives the product decomposed in the above and biogasifies it and recovers the generated biogas, the boiler 4 that supplies steam to the hydrolysis device 2, and the steam of the hydrolysis device 2. It includes a capacitor 5 for releasing pressure and a control device 6 for controlling the pressure, temperature, and the like of the hydrolysis device 2. If necessary for various circumstances such as raw materials, a water content adjusting device, a cleaning device for cleaning the hydrolyzed raw material with a cleaning liquid (not shown), and / or the washed raw material for solid content and liquid content. A solid-liquid separator (not shown) for separating is provided.

The hydrolysis device 2 is for producing a product for hydrotreating the raw material and performing a biogasification treatment, and is a processing container 23 having a raw material input port 21 and a product discharge port 22 and a processing container 23. A stirring means for stirring raw materials, a steam supply pipe 24 for supplying steam to the processing container 23, a plurality of steam supply ports 25 for supplying steam from the steam supply pipe 24 to the processing container 23, and a processing container. It is provided with a steam exhaust pipe 26 for discharging steam from 23.

The processing container 23 is a horizontal type, but may be a vertical type. Raw materials to be biogasified as waste include organic waste such as processed marine product residues, various sludges, agricultural and processed agricultural product residues, beverage residues, and municipal waste. It is preferable that this raw material is crushed to a size of 100 mm or less on each side by using a crushing means (not shown). The crushing means may be a known one, but when a soft material such as a fishery product residue is used as a raw material, a uniaxial rotary type crushing means may be used.

The crushed raw material may be weighed in a single dose according to the internal volume of the processing container 23 of the waste biogasification treatment apparatus 1, and temporarily stored in a raw material input silo (not shown). The internal volume of this raw material input silo (not shown) depends on the internal volume of the processing container 23, and is usually 1.1 to 1.2 times the internal volume of the processing container 23. When storing raw materials containing acidic or basic substances such as fishery processed product residues, the raw material input silo is preferably made of a material having corrosion resistance.

Since high-pressure steam is supplied to the inside of the processing container 23 from the steam supply port 25 described later, it is necessary to satisfy the requirements of the first-class pressure vessel. Therefore, the internal volume, diameter, plate thickness, and material of the processing container 23 are designed within the requirements of the type 1 pressure vessel according to the amount of the raw material.

The higher the pressure resistance performance of the processing container 23, the better, but in consideration of practicality and economy, it is usually 2 MPa to 10 MPa, preferably 3 MPa to 8 MPa.

The hydrolysis device 2 often hydrolyzes raw materials under high temperature, high pressure, strong acidity, and strong basic conditions. The processing container 23 is preferably lined with a thin plate of a chemical resistant stainless steel (SUS316) or a fluorine-based or silicone-based polymer material inside the pressure-resistant structure. Ordinary stainless steel (SUS304) may be used depending on the raw material to be treated.

The raw material input port 21 is formed in the upper part of the processing container 23. If the raw material input port 21 is formed on the side surface of the processing container 23, the stirring means described later becomes an obstacle, and it becomes difficult to input the raw material.

The raw material input port 21 is connected to a pressure-resistant valve 27 that can be opened and closed. Since the raw material input port 21 is closed during the hydrolysis treatment, the pressure resistance of the pressure resistant valve 27 is preferably equal to or higher than the pressure resistance of the processing container 23.

The product discharge port 22 is formed in the lower part of the processing container 23.

The processing container 23 has a stirring means (not shown) driven by a motor 28 for stirring and mixing the raw materials inside. As the stirring means, a known one such as a paddle type or a screw type can be used. This stirring means can mix the high-viscosity and high-weight raw materials inside the processing container 23 while crushing them to make the raw materials uniform.

The stirring means (not shown) is a screw type, and if the inner diameter of the processing container 23 is 100 cm and the total length is 250 cm, the outer diameter of the stirring blade is 95 cm to 98 cm, the pitch is 30 cm to 50 cm, and the blade shape is a fan. It may be a mold or a paddle type.

The rotation speed of the stirring means is appropriately set in the range of 0.1 rpm to 50 rpm, preferably 0.5 rpm to 30 rpm, depending on the raw material. Since the stirring means (not shown) crushes and shears at the same time as stirring and mixing, it is preferable to emphasize the stirring torque rather than the stirring speed.

Stirring by the stirring means (not shown) is preferably started at the same time as the raw material is charged. As the stirring conditions, the start time and the completion time of the stirring operation are appropriately set according to the reaction time of the waste biogasification treatment apparatus 1 and the state of the raw materials. At this time, the stirring operation may be continuous or intermittent. In the stirring operation, the rotation direction may be controlled by a timer so as to repeat forward rotation and reverse rotation at predetermined time intervals. If the stirring means is rotated only in a certain direction, the raw materials may be biased to one side, and crushing and mixing by stirring cannot be performed uniformly.

A configuration in which steam is supplied to the inside of the processing container 23 and steam is exhausted from the processing container 23 will be described. The processing container 23 has a plurality of steam supply ports 25 along the longitudinal direction of the processing container 23. The plurality of steam supply ports 25 are connected to a plurality of branch pipes (not shown) branched from the steam supply pipe 24 downstream of the control valve 29.

The control valve 29 controls the pressure inside the processing container 23 to a predetermined pressure, for example, 3 MPa, by a pressure gauge 2a provided in the processing container 23. At this time, the temperature inside the processing container 23 is measured by the thermometer 2b. The processing container 23 is provided with a safety valve 2c in case an instrument such as a pressure gauge 2a or various valves break down.

In the boiler 4, fuel is supplied from the fuel supply port 41. The capacity of the boiler 4 is set according to the internal volume of the processing container 23 and the heating time.

The steam supply pipe 24 is connected to the boiler 4 via a control valve 29. The boiler 4 uses an organic substance as fuel to generate steam, and has the ability to adjust the processing container 23 to a predetermined pressure (steam pressure) and temperature.

The steam from the processing container 23 may be exhausted to a condenser tank filled with water, which is 3 to 10 times the internal volume of the processing container 23, without using the condenser 5. This condenser tank also functions as a pressure release means for reducing the exhausted steam (for example, 3.0 MPa) to about normal pressure (0.1 MPa).

Since steam can be uniformly supplied to the inside of the processing container 23, the temperature and pressure inside the processing container 23 can be made uniform. By making the temperature and pressure inside the processing container 23 uniform, the hydrolysis treatment of the raw material containing the organic waste can also proceed uniformly, and the product can be made uniform.

The boiler 4 may be provided exclusively as in the present embodiment, but if there is a surplus of steam in the factory boiler and the steam meets the usage conditions of the processing container 23, it may be directly introduced. The boiler 4 may be provided with various types of boilers such as a once-through boiler.

The processing container 23 has a plurality of steam exhaust ports 26a along the longitudinal direction of the processing container 23. The plurality of steam exhaust ports 26a are connected to a plurality of branch pipes (not shown) each having a ball valve (not shown) and are assembled in the steam exhaust pipe 26.

The plurality of ball valves (not shown) adjust the flow rate or flow velocity of steam from the processing container 23, and the opening degree is set automatically or manually. Although the exhaust of steam from the processing container 23 depends on the internal pressure, for example, it takes 5 to 60 minutes to reduce the pressure inside the processing container 23.

The condenser 5 is a cyclone that recovers aggregates (aggregated liquid and dust) from the exhausted vapor. The capacitor 5 may be a tangential cyclone having a simple structure, an axial-flow cyclone, or a multi-cron by connecting cyclones in parallel or in series. When the outer circumference of the condenser 5 is heated, the coagulated liquid is substantially vaporized, so that dust (powdered solid matter) is recovered from the lower part of the condenser 5.

In addition to recovering the agglomerates, the condenser 5 also functions as a pressure release means for reducing the exhausted steam (for example, 3.0 MPa) to about 0.5 MPa. Therefore, the internal volume of the capacitor 5 is 0.5 to 1.5 times the internal volume of the processing container 23.

The steam from which the agglomerates have been recovered by the condenser 5 is released to the atmosphere as it is, but if necessary, a deodorizer is provided downstream of the condenser 5 to deodorize the exhausted steam and release it to the atmosphere. You may. As the deodorizer, a known adsorbent type can be used, and the adsorbent may be appropriately selected from activated carbon, lime, zeolite, etc., depending on the odor component.

The biogasification recovery device 3 includes a product receiving port 31 and a biogas discharge port 32 for discharging the generated biogas.

The biogas generated by the biogasification recovery device 3 is used for (1) fuel gas for a gas generator, (2) fuel gas for a burner used in a boiler, and the like. The heat generated during power generation by a gas generator may be used to generate steam, which may be used for hydrolysis.

The method for producing a product according to an embodiment of the present invention is a method for producing a product by hydrolyzing a raw material containing an organic waste, and a hydrolysis treatment step of hydrolyzing the raw material with steam. The biogasification recovery step of biogasifying and recovering the hydrolyzed product is provided. If necessary, a washing step of washing the hydrolyzed raw material with a washing liquid, and a solid-liquid separation step of separating the washed raw material into a solid content and a liquid content to make the water content of the solid content, for example, 80%. And the solid content is the product. Since liquids are outside the scope of the present invention, description thereof will be omitted.

A method for producing a product according to an embodiment of the present invention will be described with reference to FIG.

(Raw material input step S100)
The raw material has an appropriate range of water content (mass standard: the same applies hereinafter) of 40 to 80%, preferably 40 to 70%, and particularly preferably 40 to 60%. Usually, when the water content (mass standard: the same applies hereinafter) of the raw material is less than 40%, water is added, and when it exceeds 80%, the water content is reduced. When the water content is less than 40%, the water or wastewater generated during hydrolysis or concentrated water generated during steam degassing is put into the treatment container 23 when hydrolyzed, and the water content is appropriately within the range (S200). ). When the water content exceeds 80% and the water content is reduced, the water content adjusting material may be simultaneously charged into the processing container 23 from the raw material input port 21 together with the raw material. As the moisture adjusting material, it is preferable to use an adsorbent capable of adsorbing harmful heavy metal ions or the like eluted by the hydrolysis treatment as well as water absorption. The adsorbent is preferably an organic adsorbent. If it is an organic adsorbent, industrial waste can be used, and the organic adsorbent itself can be hydrolyzed. As the organic adsorbent, sawdust, rice husks, wood chips, straw, rice straw and the like are preferable. When an inorganic adsorbent is used, slaked lime, zeolite, pumice, etc. are preferable. The water content of the moisture adjusting material is 30% or less, preferably 15% or less.

The raw material is put into the processing container of the hydrolysis treatment apparatus.

When the raw material is put into the processing container, the raw material may be agitated by rotating the stirring means in the processing container. The operation of the stirring means may be continuous or intermittent, but the rotation direction may be controlled by a timer so as to repeat forward rotation and reverse rotation at predetermined time intervals.

After the raw material and the moisture adjusting material are charged from the raw material input port 21 of the processing container 23, the pressure-resistant valve 27 on the raw material input port 21 side is closed and the processing container 23 is sealed (S300).

(Pressurized heating step S400)
When the processing container 23 is sealed, steam is supplied from the boiler 4 to the inside of the processing container 23 via the steam supply pipe 24 and the control valve 29, and the inside of the processing container 23 is pressurized to a predetermined pressure and temperature. And the temperature is raised.

The internal pressure of the processing container at this time is 1.2 MPa to 3.0 MPa, preferably 1.5 MPa to 2.5 MPa, and the internal temperature is 189 ° C. to 234 ° C., preferably 200 ° C. to 224 ° C. The temperature holding time for hydrolysis is 10 minutes to 2 hours, preferably 30 minutes to 1.5 hours after the internal temperature reaches the target temperature range. The target temperature range differs depending on the type of raw material. Since it is saturated water vapor, if one of the pressure and temperature is known, the other can be determined. Since the temperature is set relatively low and the holding time is set for a long time, the solid content of the product does not carbonize, and it is smoothly biogasified when it is biogasified in the biogasification recovery step described later. Can be done. There is an upper limit on the holding time due to production capacity. Biogas often contains methane.

(Hydrolyzed step S500)
When the inside of the processing container 23 is maintained at a predetermined pressure and temperature, the raw material is an organic waste and therefore begins to be hydrolyzed. When a predetermined time elapses within the above holding time from the start of steam supply, the hydrolysis treatment of the raw material is almost completed, so that the supply of steam from the boiler 4 to the inside of the processing container 23 is stopped and hydrolysis is performed. End the process. By this hydrolysis treatment step, the raw material is hydrolyzed, and when the moisture adjusting material is organic, the moisture adjusting material is also hydrolyzed, and harmful heavy metal ions and the like are eluted into the liquid component, but not yet. It is adsorbed by the hydrolyzed adsorbent and moves to the solid content side.

In the hydrolysis treatment step, the motor 28 may be driven, the stirring means may be rotated, and the raw material may be stirred in the same manner as in the raw material charging step. The stirring operation may be continuous or intermittent, but the rotation direction may be controlled by a timer so as to repeat forward rotation and reverse rotation at predetermined time intervals.

The time of the hydrolysis treatment is appropriately changed depending on the treatment amount and the like, but about 10 minutes to 2 hours is sufficient.

By hydrolyzing the raw material, the polymer such as cellulose is reduced in molecular weight. That is, plant fibers (plant cell walls and cell membranes) become brittle or destroyed. In addition, elements such as potassium, chlorine, and chlorine in plant cells are easily eluted or easily eluted in the liquid component.

(Steam exhaust process S600)
After the completion of the hydrolysis treatment step, it takes 5 to 60 minutes to exhaust the pressure inside the treatment container 23 through the steam exhaust pipe 26 connected to the steam exhaust port 26a to obtain normal pressure. Release to about (0.1 MPa). The exhausted steam also contains dust as a raw material accompanied by droplets.

After the completion of the hydrolysis treatment step, the pressure inside the treatment container 23 is released to a normal pressure of 0.1 MPa to 0.3 MPa by using the capacitor 5 over 30 to 60 minutes.

(Product discharge process S700)
The product (sludge state) hydrolyzed by the waste biogasification treatment apparatus 1 is discharged from the product discharge port 22 at the lower part of the treatment container 23.

If necessary, a washing step and / or a solid-liquid separation step may be performed before the sludge, which is a product of hydrolysis, is biogasified.

In the cleaning step, the discharged product is put into a cleaning device and immersed in a cleaning liquid for cleaning. The cleaning liquid may be water such as factory water or tap water, and it is preferable to use 5 times or more, preferably 10 to 20 times the volume of the raw material. The temperature of the cleaning liquid may be about 60 ° C. from normal temperature. The cleaning time is appropriately changed depending on the amount of treatment and the like, but about 15 to 30 minutes is sufficient.

Depending on the state of the product, solid-liquid separation (dehydration) may or may not be performed using a solid-liquid separation device before gasification. When solid-liquid separation is not performed, the raw material does not contain much components such as chlorine and potassium that inhibit methane fermentation in the biogasification recovery step described later. When solid-liquid separation is performed, a large amount of inhibitory components are contained, and the product is washed with water to perform solid-liquid separation. The water content is adjusted to 70% to 90% by the solid-liquid separation step.

When solid-liquid separation is performed, solid-liquid separation may be performed by using solid-liquid separation means such as floating / sedimentation separation, filter press, and centrifugation to reduce water content. The hydrolyzed raw material allows the solid content of the separated product to be used as fertilizer or compost and the liquid content of the product as a raw material for liquid fertilizer. The water content is set to 70 to 90% by the washing step.

In the case of solid-liquid separation, after the liquid component is simply removed by a simple filter such as a metal mesh, the product may be sent to a solid-liquid separation device to perform solid-liquid separation. As a result, the product is separated (dehydrated) into a solid content and a liquid content. A solid-liquid separator such as a screw conveyor type (see, for example, Japanese Patent Application Laid-Open No. 2012-153790) that squeezes (dehydrates) the liquid content from the raw material that is the solid content is used. If it is a screw conveyor type, solid-liquid separation can be continuously performed, so that productivity is improved. Please refer to Patent Document 1 for a specific process such as when the raw material is EFB.

The product hydrolyzed by the hydrolysis device 2 is charged into the biogasification recovery device 3.

(Biogasification recovery step S800)
The product is biogasified and biogas recovered by the biogasification recovery device 3. Since the product is in a pre-hydrolyzed and primary decomposed state, a large amount of biogas can be generated in a short time. The biogas produced is mainly methane, which can be used for power generation and gas fuel. As the biogasification recovery device, a commercially available methane fermentation biogas generator may be used.

Depending on the waste, treatment may be performed to reduce the content of chlorine, potassium, etc. in the solid content. After the solid-liquid separation step, the process is returned to the cleaning step, and the separation step and the cleaning step are repeated a plurality of times. This allows the product to be reliably washed. Since chlorine, potassium and the like in the solid matter are eluted into the cleaning liquid by a plurality of washings, the content of chlorine and potassium in the solid matter can be reduced. Depending on the waste, the treatment for lowering the potassium content in the solid content may be performed before the raw material process is added.

In the present embodiment, the cleaning liquid in the cleaning step is water. As a result, since no special chemical solution is used for the cleaning solution of the product, inexpensive factory water or tap water can be used.

Although the preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the above-described embodiments, and various modifications and modifications are made within the scope of the gist of the present invention described in the claims. Is possible.

1 Waste biogasification treatment device 2 Hydrolysis device 2a Pressure gauge 2b Thermometer 2c Safety valve 3 Biogasification recovery device 4 Boiler 5 Condenser 6 Control device 14 Steam exhaust port 21 Raw material input port 22 Product discharge port 23 Processing container 24 Steam supply pipe 25 Steam supply port 26 Steam exhaust pipe 26a Steam exhaust port 27 Pressure-resistant valve 28 Motor 29 Control valve 31 Product inlet 32 Biogas outlet 41 Fuel supply port

The present invention comprises a processing container having a raw material input port and a product discharge port, a stirring means provided inside the processing container for stirring raw materials, a steam supply pipe for supplying steam to the processing container, and the processing. A hydrolyzer having a steam exhaust pipe for discharging steam from a container, a solid-liquid separator for solid-liquid separation of the hydrolyzed raw material to obtain a product having a water content of 70 to 90%, and the product. It is a waste biogasification treatment device characterized by being provided with a biogasification recovery device that biogasifies and recovers the generated biogas.

Further, the present invention includes a raw material introduction step of introducing a feedstock comprising organic waste into the processing chamber, a hydrolysis step of hydrolyzing processing the raw material by the steam, the hydrolyzed raw material in the hydrolysis step In the hydrolysis treatment step, the solid-liquid separation step of solid-liquid separation to obtain a product having a water content of 70 to 90% and a biogasification recovery step of biogasifying and recovering the product are provided. The internal pressure of the treatment container is 1.2 MPa to 3.0 MPa, the treatment temperature is 189 to 234 ° C., and the holding time after the treatment temperature reaches the target temperature range is 10 minutes to 2 hours. This is a waste biogasification treatment method. Prior to the solid-liquid separation step, it is preferable to further include a washing step of washing the raw material hydrolyzed in the hydrolysis treatment step with water.

Claims (2)

A processing container with a raw material input port and a product discharge port,
A stirring means provided inside the processing container to stir the raw materials,
A steam supply pipe that supplies steam to the processing container and
A hydrolyzer having a steam exhaust pipe for discharging steam from the processing container, and
A biogasification recovery device that biogasifies the product discharged from the product discharge port and recovers the generated biogas.
A waste biogasification treatment device characterized by being provided. Raw material input process for charging raw materials containing organic waste into processing containers,
A hydrolysis treatment step of hydrolyzing the raw material with steam, and
A biogasification recovery step of biogasifying the product produced in the hydrolysis treatment step and recovering the generated biogas,
With
In the hydrolysis treatment step, the internal pressure of the treatment container is 1.2 MPa to 3.0 MPa, the treatment temperature is 189 to 234 ° C, and the holding time after the treatment temperature reaches the target temperature range is 10 minutes to 2 A waste biogasification treatment method characterized by time.

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