JP2003117595A - Treating method and treating equipment for solid-liquid mixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a treating method and a treating equipment for a solid-liquid mixture capable of efficiently decomposing hardly biodegradable materials and reducing the amount of the solid contents to be discharged by effectively utilizing the microbial cells of microorganisms. SOLUTION: The treating method has a solubilization treating process step 3 in which the solid-liquid mixture obtained in an anaeration fermenting process step 2 is directly sent from this anaeration fermenting process step 2 and dissolves the microbial cells of microorganisms in the solid-liquid mixture, a separation treating process step 5 which separates the solid-liquid mixture obtained by this solubilization treating process step to a liquid segment containing much of the solubilized liquid and a thickened segment including the many hardly biodegradable materials, and a returning process step which returns the liquid segment to an upstream side of the anaeration fermenting process step or the anaeration fermenting process step. The method may also have a thickening and separation treating process step of thickening or separating the solid-liquid mixture obtained by the anaeration fermenting process step 2. Also, the method may be provided with a returning process step of returning the solid-liquid mixture obtained in the solubilization treating process step 3 to the upstream side of the anaeration fermenting process step 2 or the anaeration fermenting process step 2 itself without subjecting the solid-liquid mixture to the separation treatment.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a method and an apparatus for treating a solid-liquid mixture obtained from an anaerobic fermentation process.

[0002]

2. Description of the Related Art Organic waste may be decomposed by anaerobic fermentation. The result of this decomposition process is a solid-liquid mixture which is to be further processed. This solid-liquid mixture contains dissolved bio-hardly-degradable substances, and further contains microbial cells and the like.

[0003]

Since the solid-liquid mixture contains a hardly biodegradable substance, the COD (chemical oxygen demand) of the discharge water is controlled to a regulated value or less in the conventional general treatment method. Difficult to lower. The solid-liquid mixture is anaerobic and the discharged water may be colored.

Further, since the solid-liquid mixture contains a large amount of microbial cells and the like, it is necessary to separate them and discharge them as solids, which requires a great deal of cost.

On the other hand, the microbial cells of microorganisms contain a large amount of nutrients for the microorganisms, but the nutrients cannot be effectively used because they are protected by the cell membrane of the microbial cells and are not easily decomposed by other microorganisms. .

An object of the present invention is to provide a method for treating a solid-liquid mixture, which is capable of efficiently decomposing hardly biodegradable substances and effectively utilizing the cells of microorganisms to reduce the amount of solids discharged. It is to provide a processing device.

[0007]

In the method for treating a solid-liquid mixture according to claim 1 of the present invention, the solid-liquid mixture obtained in the anaerobic fermentation step is directly fed from the anaerobic fermentation step to obtain the solid-liquid mixture in the solid-liquid mixture. The solubilization treatment step of lysing the microbial cells of the microorganism, and the liquid portion containing a large amount of the solubilized liquid of the solid-liquid mixture obtained by the solubilization treatment step and the concentrated portion containing a large amount of substances that are difficult to biodegrade. It is characterized by comprising a separation treatment step of separating and a returning step of returning the liquid portion to the upstream side of the anaerobic fermentation step or the anaerobic fermentation step.

As a result, the bacterial cells of the microorganism in the solid-liquid mixture are dissolved, the solid content is reduced, the raw material is diluted by the returned liquid portion, and the nutrient components of the bacterial cells are effectively used. be able to.

The method for treating a solid-liquid mixture according to claim 2 of the present invention comprises a concentration / separation treatment step for concentrating or separating the solid-liquid mixture obtained in the anaerobic fermentation step, and a concentration in the concentration / separation treatment step. A solubilization treatment step in which the solid-liquid mixture is sent to dissolve the microbial cells and the like in the solid-liquid mixture,
A separation treatment step of separating the solid-liquid mixture obtained by the solubilization treatment step into a liquified liquid-rich liquid portion and a biodegradable substance-rich concentrated portion, and the anaerobic fermentation step. And a returning step for returning to the anaerobic fermentation step.

As a result, the concentrated and separated solid-liquid mixture is subjected to the solubilization treatment step, so that the solubilization efficiency is enhanced. As the concentration / separation step, for example, a method such as coagulation precipitation or filtration can be adopted.

The method for treating a solid-liquid mixture according to claim 3 of the present invention comprises a solubilization treatment step for dissolving microbial cells and the like in the solid-liquid mixture obtained in the anaerobic fermentation step, and the solubilization treatment step. The solid-liquid mixture obtained in 1. is returned to the upstream side of the anaerobic fermentation step or the anaerobic fermentation step without performing a separation treatment.

[0012] As a result, when the solid-liquid mixture contains a small amount of bio-hardly-degradable solids such as fibers, the utilization efficiency can be increased without separation treatment, thus contributing to simplification of the process.

The method for treating a solid-liquid mixture according to a fourth aspect of the present invention is characterized by comprising an electrolysis treatment step of subjecting the dilute liquid obtained in the concentration treatment step to an electrolysis treatment.

As a result, the biodegradable substance is converted into a biodegradable substance by the decomposition action by electrolysis, and is decomposed by direct electrolysis.

In the method for treating a solid-liquid mixture according to a fifth aspect of the present invention, in the solubilizing treatment step, at least one of heat treatment, alkali addition treatment, acid addition treatment, ultrasonic addition treatment and electrolysis treatment is performed. It is characterized in that it is processed.

This makes it possible to adopt a treatment depending on the properties of the solid-liquid mixture, etc., and improve the efficiency of solubilization.

The method for treating a solid-liquid mixture according to a sixth aspect of the present invention is characterized in that the liquid that has undergone the electrolysis treatment step is subjected to a biodegradation treatment.

As a result, it is possible to obtain water that can be discharged by decomposing a substance that has been changed to a state in which it is easily decomposed by living organisms.

In the solid-liquid mixture treating apparatus according to claim 7 of the present invention, the solid-liquid mixture obtained by the anaerobic fermentation apparatus is directly sent from the anaerobic fermentation apparatus to obtain bacterial cells of the microorganisms in the solid-liquid mixture. And a separation treatment device for separating the solid-liquid mixture obtained by the solubilization treatment device into a liquid portion containing a large amount of solubilized liquid and a concentrated portion containing a large amount of a substance that is difficult to biodegrade. And a return device for returning the liquid portion to the upstream side of the anaerobic fermentation device or to the anaerobic fermentation device.

As a result, the bacterial cells of the microorganism in the solid-liquid mixture are dissolved, the solid content is reduced, the raw material is diluted by the returned liquid portion, and the nutrient components of the bacterial cells are effectively used. be able to.

The solid-liquid mixture treatment apparatus according to claim 8 of the present invention is a concentration / separation treatment apparatus for concentrating or separating a solid-liquid mixture obtained by an anaerobic fermentation apparatus, and a concentration / separation treatment apparatus for concentration. A solubilization treatment device that is fed with a concentrated solid-liquid mixture and dissolves the bacterial cells of microorganisms in the solid-liquid mixture, and a liquid containing a large amount of the solubilized liquid of the solid-liquid mixture obtained by the solubilization treatment device A separation treatment device for separating a portion and a concentrated portion containing a large amount of a substance that is difficult to biodegrade, and a return device for returning the liquid portion to the upstream side of the anaerobic fermentation device or the anaerobic fermentation device. .

As a result, the concentrated and separated solid-liquid mixture is subjected to the solubilization treatment step, so that the solubilization efficiency is enhanced.

A solid-liquid mixture treatment apparatus according to a ninth aspect of the present invention is a solubilization treatment apparatus for dissolving microbial cells in a solid-liquid mixture obtained by an anaerobic fermentation apparatus, and the solubilization treatment apparatus. The solid-liquid mixture that has passed through the above is provided with a returning device for returning the solid-liquid mixture to the upstream side of the anaerobic fermentation device or the anaerobic fermentation device without performing a separation treatment.

Thus, when the solid-liquid mixture contains few biodegradable solids such as fibers, the utilization efficiency can be improved without separation treatment, which contributes to simplification of the process and apparatus.

A solid-liquid mixture treatment apparatus according to a tenth aspect of the present invention is characterized by comprising an electrolyzer for subjecting the dilute liquid obtained by the concentration / separation treatment apparatus to an electrolysis treatment.

As a result, the biodegradable substance is changed into a biodegradable substance by the decomposition action by electrolysis, and is decomposed by direct electrolysis.

In the solid-liquid mixture treatment apparatus according to claim 11 of the present invention, in the solubilization treatment apparatus, at least one of heat treatment, alkali addition treatment, acid addition treatment, ultrasonic addition treatment and electrolysis treatment is performed. It is characterized in that it is processed.

This makes it possible to adopt a treatment depending on the properties of the solid-liquid mixture, etc., and improve the solubilization efficiency.

A solid-liquid mixture treating apparatus according to a twelfth aspect of the present invention is characterized in that, in the electrolyzing apparatus, the material is porous and is non-insulating or non-insulating. It is characterized in that a material mixed with a substance is filled between the electrodes.

As a result, the filler forms a three-dimensional electrode, which increases the processing area and improves the processing efficiency. Since it is also a porous material, it adsorbs a biodegradable substance to concentrate the solid-liquid mixture, the treatment efficiency is enhanced, the contact area between the liquid and the electrode is widened, and the treatment efficiency is similarly enhanced. In addition, the non-insulator conducts electricity and acts as a micro battery, which improves processing efficiency.

According to a thirteenth aspect of the present invention, in the apparatus for treating a solid-liquid mixture, a porous plate is inserted between the electrodes in the electrolysis apparatus.

As a result, the processing capacity can be enhanced by relatively enlarging the cathode area or the anode area formed between the electrodes and selectively using them depending on the object to be processed.

A solid-liquid mixture treatment apparatus according to a fourteenth aspect of the present invention is characterized by comprising a biodegradation treatment apparatus for subjecting the liquid that has passed through the electrolysis apparatus to a biodegradation treatment.

As a result, the biodegradable substance that has been changed to a state where it can be easily decomposed by the organism can be decomposed by the organism, and water that can be discharged can be obtained.

[0035]

BEST MODE FOR CARRYING OUT THE INVENTION A method for treating a solid-liquid mixture according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a processing flow chart showing a method for processing a solid-liquid mixture according to one embodiment. This treatment method uses a large amount of solids such as organic waste, which makes it difficult to ferment cellulose,
It is an optimal process for treating raw materials that contain a large amount of lignin. Pretreatment step 1 is applied to these raw materials. The contents of pretreatment include selection, crushing, solubilization of raw materials,
It is performed to improve the efficiency of the processing in the subsequent steps.

An anaerobic fermentation treatment step 2 is applied to the raw material which has passed through the pretreatment step 1. As a result of anaerobic fermentation, gas is generated and a solid-liquid mixture is obtained. This solid-liquid mixture is guided to the solubilization treatment step 3 to dissolve the microbial cells and the like contained in the solid-liquid mixture. The solubilization method may be any method as long as it can dissolve cells and the like, and examples thereof include heat treatment, alkali addition treatment, acid addition treatment, ultrasonic addition treatment, electrolysis treatment, and at least these treatments. One that does one can be employed. Further, by combining a plurality of treatment methods, a synergistic effect is obtained and solubilization is effectively performed. The optimum solubilization treatment method may be selected by comprehensively considering the cost and operation efficiency. Particularly, in the anaerobic fermentation treatment step 2, since methane gas is produced, the heat treatment using this methane gas as a fuel is effective. In this case, the higher the heating temperature is, the higher the effect is, but the optimum condition is determined by comprehensively judging cost and workability. The heating method using methane gas generated in the anaerobic fermentation treatment step 2 as a fuel is not limited to the solubilization treatment step and can be used for drying the solid-liquid mixture and the like.

Before introducing a part of the solid-liquid mixture obtained by the anaerobic fermentation treatment step 2 to the solubilization treatment step 3, the aeration treatment step 4 may be performed (shown by the dotted line in the figure). In the treatment, air is injected to accelerate the decomposition of the solid-liquid mixture, and the odor and the like of the solid-liquid mixture are expelled to make it into an aerobic state.

The solid-liquid mixture obtained in the solubilization treatment step 3 is directly introduced into the separation treatment step 5 (without any other process). In the separation treatment step 5, the solid-liquid mixture is separated into a dilute liquid portion and a concentrated portion. The concentrated portion containing a large amount of solid content obtained in the separation treatment step 5 is guided to the next drying treatment step 6. The diluted liquid portion is returned to the upstream side of the anaerobic fermentation processing step 2. If it is on the upstream side of the anaerobic fermentation step 2, it may be returned to the pretreatment step 1 (dotted line part in the figure). Alternatively, it may be returned directly to the anaerobic fermentation treatment step 2.

By the drying in the drying treatment step 6, the solid portion in the solid-liquid mixture is discharged as a solid content, and mainly the liquid portion is guided to the aerobic treatment step 7 and air is injected.
The liquid portion mainly obtained by the aerobic treatment step 7 is guided to the precipitation treatment step 8 and the supernatant liquid is discharged as discharged water, and the precipitate is on the upstream side of the solubilization treatment step 3 and in the anaerobic fermentation step 2. It is guided to the downstream side and guided to the solubilization treatment step 3. This is because the microorganisms in the aerobic sludge are solubilized and used as a nutrient source for anaerobic fermentation to increase the amount of gas generated.

FIG. 2 is a processing flow chart showing a method for processing a solid-liquid mixture according to another embodiment. This treatment method is the most suitable treatment method for treating liquid organic wastewater containing a large amount of water. These raw materials are guided to the anaerobic fermentation step 2 similar to the above-mentioned embodiment without being subjected to the pretreatment step. The reason why the pretreatment is not performed is that the properties of the raw material are good and it is not necessary to perform the pretreatment, or the pretreatment is performed in another process. The solid-liquid mixture that has undergone the anaerobic fermentation treatment step 2 is guided to the aerobic conversion treatment step 10. In the aerobic conversion treatment step 10, air is blown into the solid-liquid mixture, whereby aerobic conversion is achieved. The reason for aerobic conversion is to prevent corrosion of downstream equipment and to drive off odors and the like.

The solid-liquid mixture discharged from the aerobic conversion process 10 is introduced to the concentration process 11 and concentrated.
As a result of this concentration, the solid-liquid mixture is divided into a concentrated solid-liquid mixture and a dilute liquid. The diluted liquid is introduced into the coagulation-sedimentation treatment step 12, and the solid content in the diluted liquid is aggregated and precipitated. The dilute liquid obtained in the coagulation sedimentation treatment step 12 is introduced into the electrolysis step 13. In this electrolysis step 13, the biologically difficult-to-decompose substance contained in the dilute liquid (a substance that is difficult to be decomposed by living organisms) is decomposed by a strong decomposition action by electrolysis to be a substance that is easily decomposed by living organisms. The diluted liquid obtained in the electrolysis step 13 is introduced into the activated sludge treatment step 14 where the microorganisms volatilize and the condensed substance is decomposed. The activated sludge treatment process 14 is guided to the precipitation treatment process 15 and the supernatant is discharged as discharged water.

The precipitate is introduced to the upstream side of the aerobic conversion treatment step 10 to promote the formation of flocs of microorganisms and enhance the concentration effect. Alternatively, the precipitate is guided to the solubilization treatment step 3 described later. The solubilization treatment step 3 is a step of dissolving the microbial cells of the microorganism in the solid-liquid mixture, as in the above embodiment. The solid-liquid mixture treated in the solubilization treatment step 3 is introduced into the separation treatment step 5. In the separation treatment step 5, the concentrated solid-liquid mixture and the dilute liquid are separated as in the above-described embodiment. The diluted liquid obtained in the separation treatment step 5 is introduced into the raw material and used for diluting the raw material, and the concentrated solid-liquid mixture is introduced into the drying treatment step 6. The concentrated solid-liquid mixture may be guided to another processing step 19 without going through the drying processing step 6. Here, for example, the other treatment 19 includes treatment so that it can be used as a liquid fertilizer.

The dilute liquid is used for diluting the raw material because the dilute liquid has undergone microbial cell solubilization treatment step 3, so that the nutrient content of the anaerobic fermentation increases and the gas generation amount increases. Because. The concentrated solid-liquid mixture is dried in a drying treatment step 6 to obtain a solid content and a condensate. Since the condensate contains volatilized organic substances,
It is introduced to the downstream side of the electrolysis step 13 and the upstream side of the activated sludge treatment step 14. Since the organic substance is easily biodegradable, it is decomposed by organisms to obtain clean discharged water.

FIG. 3 is a processing flow chart showing a method of processing a solid-liquid mixture according to still another embodiment. Similar to that shown in FIG. 2, this treatment method is an optimal treatment method for treating liquid organic wastewater containing a large amount of water. Similar to the above embodiment, the raw material is introduced into the anaerobic fermentation step 2 without being subjected to the pretreatment step. Anaerobic fermentation process 2
The solid-liquid mixture passed through is introduced into the aerobic conversion treatment step 10.
When a filter press or the like is used, the aggregating step may be omitted, and the aggregating and separating may be performed by the same device.

The solid-liquid mixture discharged from the aerobic conversion process 10 is guided to the coagulation process 16. In this aggregation treatment step 16, the suspended solids in the solid-liquid mixture are aggregated to achieve solid-liquid separation. The solid-liquid mixture obtained in the aggregation treatment step 16 is guided to the separation treatment step 21 to separate the solid-liquid. This separates the solid-liquid mixture into a concentrated solid-liquid mixture and a dilute liquid. The concentration treatment and the separation treatment may be used in the same meaning in the wastewater treatment process. It is often used with the same meaning in methods other than membrane separation, and in the embodiment of the present invention, it means dividing into a dilute liquid portion and a concentrated solid-liquid mixture in both the concentration treatment and the separation treatment.

The diluted liquid obtained from the separation treatment step 21 is introduced into the electrolysis step 13, and the concentrated solid-liquid mixture is introduced into the solubilization treatment step 3.

In the electrolysis step 13, as in the case of the above-mentioned embodiment, the hardly biodegradable substance is changed to a substance which is easily decomposed by the organism by electrolysis. The dilute liquid obtained in the electrolysis step is introduced to the activated sludge treatment step 14 where microorganisms decompose the pollutants. The activated sludge treatment process 14 is guided to the precipitation treatment process 15 and the supernatant is discharged as discharged water.

Part of the precipitate is introduced into the solubilization treatment step 3. The dilute liquid obtained by the solubilization treatment step 3 is
It is introduced to the upstream side of the anaerobic fermentation process 2 and mixed into the raw material. The concentrated solid-liquid mixture is introduced into the separation treatment step 5. In the separation treatment step 5, a concentrated solid-liquid mixture and a dilute liquid are obtained, the diluted liquid is introduced into the raw material on the upstream side of the anaerobic fermentation step 2 and used for dilution, and the concentrated solid-liquid mixture is introduced into the drying treatment step 6. Get burned. In the drying treatment step 6, a solid matter and a condensate are obtained, and the condensate is introduced to the downstream side of the electrolysis step 13 and the upstream side of the activated sludge treatment step 14.

In the treatment methods shown in FIGS. 2 and 3, when the waste water as a raw material does not contain a large amount of substances or components that are difficult to ferment, after the solubilization treatment step 3, solid-liquid separation or the like is performed. You may make it return a solid-liquid mixture directly to an anaerobic fermentation process process, without performing a process. In this case, the solid content is not discharged from the solubilization treatment step 3.

The separation treatment performed after the coagulation treatment step 16 can be carried out by using an appropriate method such as filtration, precipitation, squeezing or the like. Which method should be adopted is determined by comprehensively judging the overall configuration of the treatment process and the operating conditions. When filtration and squeezing (filter press) are used, the aggregating treatment is often unnecessary, so that the aggregating treatment step can be omitted, or the same apparatus may be used. The concentrated portion obtained by the condensation or separation operation may be subjected to a process such as drying without being solubilized.

An outline of the electrolysis apparatus used in the electrolysis step 13 in the above processing steps will be described with reference to FIGS. 4 to 7.

In the electrolyzer 30 shown in FIG. 4, electrodes (cathode 31, anode 32) are arranged in a casing 33 so as to face each other. Regarding the shape and size of the electrode, an optimum one is selected by comprehensively judging the properties of the water to be treated, the operating conditions, and the like. An opening 34 is formed in the upper part of the casing 33 so that the water to be treated can be introduced, and a discharge port 35 for discharging the treated water is formed in the lower part. A casing 36 between the cathode 31 and the anode 32 is filled with a filler 36.

The filler 36 is preferably a porous material and a non-insulating material or a mixture of a non-insulating material and an insulating material. In particular, the properties required for fillers are that they are porous, have high mechanical strength, have no remarkable solubility in the water to be treated, are inexpensive, and are stably supplied. Is. Overall, activated carbon and zeolite are suitable materials. The shape of the filler 36 is preferably granular. By filling such a filler 36, a three-dimensional electrode is formed, the processing area is increased, and the processing efficiency is increased. Since it is a porous material, it can adsorb a biodegradable substance to enhance the treatment efficiency, the contact area between the liquid and the electrode is widened, and the treatment efficiency is enhanced. The non-insulating material conducts electricity and acts as a micro battery, improving the processing efficiency.

The current applied between the cathode 31 and the anode 32 is preferably a direct current, which flows in pulses. Considering safety, the voltage should be low, but
Select the most appropriate one by comprehensively judging the cost, effect and safety. If the voltage value is kept low, it is necessary to reduce the distance between the electrodes to some extent, but the distance and the like are determined by comprehensively judging various electrochemical conditions.

In the electrolyzer shown in FIG. 5 or 6, a porous plate 37 is interposed as a partition plate between the cathode 31 and the anode 32. In the structure shown in FIG. 5, the porous plate 37 is arranged so as to contact the anode 32. In FIG. 6, the perforated plate 37 is arranged so as to contact the cathode 31. By inserting the porous plate 37, the cathode area or the anode area formed between the electrodes can be relatively enlarged, and the processing capacity can be enhanced by properly using the material according to the object to be processed.

In the electrolyzer shown in FIG. 7, a space 33a in the casing 33 in which the cathode 31 is arranged and a space 33b in the casing 33 in which the anode 32 is arranged are partitioned by a perforated plate 38. The water to be treated is introduced into the space 33a in the casing 33 in which the cathode 31 is arranged, and the discharge port 39 is provided in the lower part of the space, and the anode 32
An inflow port 40 is provided in the lower portion of the space 33b in the casing 33 in which is disposed, and the exhaust port 39 and the inflow port 40 are connected by a pipe 41. Further, a water distribution pipe 42 for discharging treated water is provided above the space 33b in the casing 33 in which the anode 32 is arranged. Perforated plate 38
This is because it is divided into an anode region having a strong oxidizing action and a cathode region having a strong reducing action, since it is inserted as a partition plate. The treated water is discharged from the space 33a in the casing 33 to the discharge port 39, the pipe 41, the inflow port 40, the space 33b in the casing 33,
It flows in order of the water distribution pipe 42. As a result, the decomposition effect is improved by changing the structure of the bio-degradable substance by the reducing action and then oxidizing it. If the flow direction can be changed to the opposite direction and the decomposition effect can be improved, the opposite direction may be adopted.

[0058]

As described above, the solid-liquid mixture treatment method and treatment apparatus of the present invention have the following advantages.

(1) The bacterial cells of the microorganisms in the solid-liquid mixture are dissolved, the solid content is reduced, the raw material is diluted by the diluted liquid part returned, and the nutrient components of the bacterial cells are effectively used. can do.

(2) Since the concentrated solid-liquid mixture is subjected to the solubilization treatment step, the solubilization efficiency is enhanced.

(3) The biodegradable substance is made into a biodegradable substance by the decomposition action by electrolysis, and is decomposed by direct electrolysis.

(4) The treatment depending on the properties of the solid-liquid mixture can be adopted, and the solubilization efficiency can be increased.

(5) Since a porous material and a non-insulating material or a mixture of a non-insulating material and an insulating material is filled between the electrodes, the three-dimensional electrodes are filled. Therefore, the processing area is increased and the processing efficiency is increased.
Since it is a porous material, it is possible to adsorb a biodegradable substance and enhance the treatment efficiency, and the contact area between the liquid and the electrode is widened to enhance the treatment efficiency. The non-insulator conducts electricity, acts as a micro battery, and improves processing efficiency.

(6) Since the porous plate is interposed between the electrodes, the cathode area or the anode area formed between the electrodes can be relatively enlarged, and the processing capacity can be changed depending on the object to be processed. Can be increased.

(7) When the solid-liquid mixture contains a small amount of biodegradable solids such as fibers, the utilization efficiency can be improved without separation treatment, which contributes to simplification of the process or apparatus.

(8) It is possible to obtain water that can be discharged by decomposing substances that have been changed to a state in which they are easily decomposed by living organisms.

[Brief description of drawings]

FIG. 1 is a diagram showing a processing flow of a method for processing a solid-liquid mixture according to an embodiment of the present invention.

FIG. 2 is a diagram showing a processing flow of a method for processing a solid-liquid mixture according to another embodiment of the present invention.

FIG. 3 is a diagram showing a processing flow of a method for processing a solid-liquid mixture according to still another embodiment of the present invention.

FIG. 4 is a schematic diagram showing an electrolyzer used in a solid-liquid mixture processing apparatus according to an embodiment of the present invention.

FIG. 5 is a schematic view showing an electrolyzer used in a solid-liquid mixture processing apparatus according to an embodiment of the present invention.

FIG. 6 is a schematic diagram showing an electrolyzer used in a solid-liquid mixture processing apparatus according to an embodiment of the present invention.

FIG. 7 is a schematic view showing an electrolyzer used in a solid-liquid mixture processing apparatus according to an embodiment of the present invention.

[Explanation of symbols]

2 Anaerobic fermentation process 3 Solubilization process 5 Separation process 11 Concentration treatment process 13 Electrolysis process 21 Decomposition process 36 Filler 37 Perforated plate 38 Perforated plate

Continued front page    F-term (reference) 4D040 AA23 AA27 AA46 AA48 BB01                       BB51                 4D059 AA07 BA11 BA12 BA31 BF02                       BF12 BF14 BF15 BK12 BK21                       BK22 CA07                 4D061 DA08 DA10 DB20 DC06 DC08                       EA03 EB04 EB07 EB22 ED15                       FA01 FA11 FA15

Claims (14)

[Claims] 1. A solubilization treatment step in which a solid-liquid mixture obtained in the anaerobic fermentation step is directly fed from the anaerobic fermentation step to dissolve bacterial cells of microorganisms in the solid-liquid mixture, and the solubilization treatment step. A separation treatment step of separating the solid-liquid mixture obtained by the above into a liquid portion containing a large amount of a solubilized liquid and a concentrated portion containing a large amount of a substance that is difficult to biodegrade, and the liquid portion upstream or anaerobic of the anaerobic fermentation step. And a returning step for returning to the fermentation step. 2. A concentration / separation treatment step for concentrating or separating the solid-liquid mixture obtained in the anaerobic fermentation step, and a solid-liquid mixture concentrated in the concentration / separation treatment step are fed to the solid-liquid mixture Separation of the solubilization treatment step for lysing microbial cells and the solid-liquid mixture obtained by the solubilization treatment step into a liquid portion containing a large amount of the solubilized liquid and a concentrated portion containing a large amount of biodegradable substances. And a returning step of returning the liquid part to the upstream side of the anaerobic fermentation step or to the anaerobic fermentation step. 3. A solubilization treatment step for dissolving bacterial cells of microorganisms in the solid-liquid mixture obtained in the anaerobic fermentation step, and a separation treatment for the solid-liquid mixture obtained in the solubilization treatment step. And a returning step for returning the anaerobic fermentation step to the upstream side or the anaerobic fermentation step. 4. The method for treating a solid-liquid mixture according to claim 2, further comprising an electrolysis treatment step of subjecting the dilute liquid obtained in the concentration / separation treatment step to electrolysis treatment. 5. The solubilization treatment step is performed by at least one of heat treatment, alkali addition treatment, acid addition treatment, ultrasonic addition treatment and electrolysis treatment. 4. The method for treating a solid-liquid mixture according to any one of 3 above. 6. The method for treating a solid-liquid mixture according to claim 4, wherein the liquid that has undergone the electrolysis treatment step is subjected to biodegradation treatment. 7. A solubilization treatment device in which a solid-liquid mixture obtained by an anaerobic fermentation device is directly fed from the anaerobic fermentation device to dissolve the bacterial cells of microorganisms in the solid-liquid mixture, and the solubilization treatment device. A separation treatment device for separating the solid-liquid mixture obtained by the above into a liquid portion containing a large amount of a solubilized liquid and a concentrated portion containing a large amount of a substance that is difficult to biodegrade, and the liquid portion upstream or anaerobic of the anaerobic fermentation apparatus. A processing device for a solid-liquid mixture, comprising a returning device for returning to a fermentation device. 8. A concentration / separation processing device for concentrating or separating a solid-liquid mixture obtained by an anaerobic fermentation device, and a concentrated solid-liquid mixture concentrated by the concentration / separation processing device are fed into the solid-liquid mixture. A solubilization treatment device for lysing the bacterial cells of the microorganism, and a liquid portion containing a large amount of the solubilized liquid of the solid-liquid mixture obtained by the solubilization treatment device and a concentrated portion containing a large amount of substances that are difficult to biodegrade. An apparatus for treating a solid-liquid mixture, comprising: a separation treatment device for separating; and a return device for returning the liquid portion to the upstream side of the anaerobic fermentation device or the anaerobic fermentation device. 9. A solubilization treatment device for dissolving bacterial cells of a microorganism in a solid-liquid mixture obtained by an anaerobic fermentation device, and anaerobic fermentation without subjecting the solid-liquid mixture that has passed through the solubilization treatment device to a separation treatment. An apparatus for treating a solid-liquid mixture, comprising a return device for returning the upstream side of the apparatus or to the anaerobic fermentation apparatus. 10. The apparatus for treating a solid-liquid mixture according to claim 8, further comprising an electrolysis apparatus for subjecting the dilute liquid obtained by the concentration / separation treatment apparatus to electrolysis. 11. The solubilization treatment device comprises heat treatment,
The method for treating a solid-liquid mixture according to any one of claims 7 to 9, wherein at least one treatment among alkali addition treatment, acid addition treatment, ultrasonic addition treatment, and electrolysis treatment is performed. 12. In the electrolyzer, a material having porosity and having a non-insulating property, or a mixture of a non-insulating substance and an insulating substance is filled between the electrodes. The solid-liquid mixture processing device according to claim 10. 13. The electrolyzer according to claim 10, wherein a porous plate is inserted between the electrodes.
An apparatus for treating a solid-liquid mixture as described. 14. The solid-liquid mixture treatment device according to claim 10, further comprising a biodegradation treatment device for subjecting the liquid passed through the electrolysis device to a biodegradation treatment.