JP2002336821A - Garbage treatment system and treatment method for garbage fermentation decomposition liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To divide the liquefied matter produced by the fermentation decomposition of garbage from solids and to decompose the garbage without making the garbage into sludge so that the liquefied matter of the recovering garbage can be discarded on the spot. SOLUTION: The liquefied matter produced by the fermentation decomposition of the garbage is successively withdrawn out of a fermenter 1 and is housed in a liquid receiving tank 2 where the liquefied matter is filtered under circulation between the same tank and a filtering tank 8. The filtrate obtained as a result thereof is housed into a storage tank 13 and is blown in a foggy form into the upper space of a fermenter 1. The set air containing the spray liquid is sucked outside the fermenter 1 through an exhaust duct 17 and is released into the liquid in a solvent tank 19. While the garbage is maintained at an adequate moisture content, the fermentation decomposition thereof can be promoted according thereto and even more, the drying of the garbage is accelerated without requiring an enormous time and heat quantity and the discharge of the liquefied matter (filtrate) thereof to public water bodies, such as rivers, is prohibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technology for fermenting and decomposing garbage (organic waste such as food residues) by the action of microorganisms. The present invention relates to a garbage disposal system and a method for treating a garbage fermentation decomposition liquid that are separated and disposed in a clean state.

[0002]

2. Description of the Related Art In recent years, with the progress of mass production and mass consumption, a large amount of waste has been generated and has become a serious social problem. In particular, garbage such as food residues has a bad smell and contains a large amount of water, so that it has been difficult to treat it. Therefore, in recent years, various devices for treating garbage have been developed for home use and business use.

[0003] As a treatment mechanism, there is a type in which garbage is heated and dried with hot air or the like to reduce the volume, but most of them use microorganisms to ferment and decompose garbage. According to such a kind of garbage processing apparatus, garbage can be ultimately decomposed into water and carbon dioxide by the action of microorganisms, and is generally widely used.

[0004]

However, a conventional garbage disposal apparatus utilizing the action of microorganisms is a method of mixing and processing a large amount of base such as sawdust and wood chips obtained by culturing microorganisms with garbage. The amount of garbage that can be processed quickly was inefficient.

[0005] For this reason, there are cases where the amount of the base material to be introduced is reduced. However, in this case, garbage is formed into sludge by the liquefied material generated during the treatment, and it is enormous to reduce the water content to an appropriate value. It required time and heat.

Therefore, the applicant of the present application has first introduced a processing apparatus that adjusts the amount of water in the fermentation tank by sequentially extracting liquefied substances (fermentation decomposition liquid) generated by fermentation decomposition of garbage from the fermentation tank through a screen. However, since the liquefied garbage extracted from the fermenter contains a large amount of suspended solids and emits an offensive odor, it cannot be discharged directly into public water bodies such as rivers. There is a problem that the processing cost involved is large because it is entrusted to facilities and the like.

The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to purify and dispose of generated liquefied matter on the spot while efficiently fermenting and decomposing garbage. It is in the thing.

[0008]

In order to achieve the above object, the present invention provides a fermentation tank for fermenting and decomposing garbage while stirring the garbage, which is connected to the bottom of the fermentation tank to generate garbage by fermentation and decomposition. And a storage tank for storing a filtrate obtained by filtering the garbage liquefied matter collected in the liquid receiving tank, and a storage tank for storing the filtrate obtained in the storage tank. Spraying means for spraying the filtrate into an upper space in the fermenter in the form of mist, and an exhaust duct for discharging wet air containing the filtrate blown into the fermenter to the outside by the spraying means is connected to the fermenter. And a garbage disposal system provided with a solvent tank for discharging the moist air at the end of the exhaust duct.

Further, the present invention is a method for treating a liquefied material generated by the fermentation and decomposition of garbage, wherein a liquefied garbage of the garbage is sequentially extracted from a fermentation tank for fermenting and decomposing the garbage. While discharging the liquefied matter stored in the storage tank into the upper space in the fermentation tank by air pressure, and discharging the liquefied substance out of the fermentation tank by putting it in an airflow in an exhaust duct connected to the fermentation tank. The present invention provides a method for treating a garbage fermentation decomposition solution.

In particular, the present invention relates to a method for treating a liquefied material generated by fermentation and decomposition of garbage, wherein a liquefied material of garbage is sequentially extracted from the inside of a fermenter for fermenting and decomposing garbage and filtered. While the filtrate stored in the storage tank is sprayed into the upper space in the fermentation tank by air pressure, and placed in an airflow in an exhaust duct connected to the fermentation tank to the solvent tank. The method is characterized in that the wet air carried by the exhaust duct is discharged into the liquid in the solvent tank.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, FIG. 1 schematically shows a garbage disposal system according to the present invention. In FIG. 1, reference numeral 1 denotes a fermenter for fermenting and decomposing garbage, and a heater panel (not shown) is provided on an outer peripheral surface thereof. Reference numeral 2 denotes a liquid receiving tank connected to the bottom of the fermenter 1.
The liquefied matter generated by fermentation decomposition of garbage in the fermenter 1 is stored in the fermenter 1.

In particular, in the present embodiment, the liquid receiving tank 2 has a weir plate 3,
A sedimentation tank divided into four chambers 6A to 6D arranged side by side by 4 and 5 forms a liquefied garbage from the fermentation tank 1 through a pipe 7 into a chamber 6A at one end. Also, the bottom surfaces of the middle rooms 6B and 6C are inclined,
The liquefied garbage including sediment is collected in the room 6A at one end on the downstream side. Reference numeral 8 denotes a filtration tank for filtering the liquefied product, and the filtration tank 8
6A of the receiving tank 2 and the pipeline 9 (outbound route)
Connected via 10 is a pump connected to the line 9;
Reference numeral 11 denotes a pipe (return path) for returning the filtrate passed through the filtration tank 8 to the liquid receiving tank 2, and the tip thereof is connected to the intermediate room 6C.

[0013] Then, the supernatant of the filtrate returned to the room 6C is over the upper part of the weir plate 5 (overflow weir) and is located in the upstream room 6D.
It is made to flow into. 12 is a pump for discharging the filtrate collected in the room 6D, and 13 is a pump 12
Is a storage tank for storing the filtrate taken out by the above-described method. The storage tank 13 has a fan 1 for taking in outside air.
4 is connected to the air compressor 15, and the filtrate stored in the storage tank 13 is atomized and blown into the fermentation tank 1 by the air pressure of the air compressor 15. Reference numeral 16 denotes a spray tube for spraying the filtrate in the storage tank 13 into the upper space of the fermenter 1, and both ends thereof are connected to the storage tank 13 and the upper part of the fermenter 1.

According to the garbage disposal system configured as described above, the liquefied matter generated by the fermentation decomposition of the garbage is sequentially extracted from the inner bottom of the fermenter 1 and the liquid receiver 2
The filtrate is purified while being circulated through the filtration tank 8 and purified, and the filtrate is stored in the storage tank 13 while the fermentation tank 1 is stored.
In the form of a mist into the upper space of the
The fermentation heat is accelerated in the inside, and the moist air containing the spray liquid (filtrate) can be discharged from the inside of the fermentation tank 1 to the outside of the fermentation tank 1 through the exhaust duct 17. In addition, exhaust duct 1
An exhaust fan 18 is interposed in 7, and a condensing solvent tank 19 for releasing wet air is provided at the tip of the fan 18.

As is apparent from FIG. 2, an appropriate amount of solution L (water in this example) is stored in the solvent tank 19, and the solution L
Inside, the humid air carried by the exhaust duct 17 is discharged. Note that the exhaust duct 17 is inserted into the bottom of the solvent tank 19, and the tip of the exhaust duct 17 is a perforated tube 1 for discharging wet air.
7A is connected. And according to this solvent tank 19,
The moist air containing the filtrate is condensed, and the increased amount of the solution L can be discarded outside by overflowing or the like. In addition, as is apparent from the figure, the solvent tank 19 and the storage tank 13 are configured as an integral unit separated by a partition 20. The storage tank 13 is divided into two chambers 13A and 13B by a partition 21, and a liquefied garbage (filtrate) of garbage is sent to one of the chambers 13A from the above-described liquid receiving tank through a pipe 22. . In particular,
This room 13A is an aeration tank to be ventilated by the fan 14 shown in FIG.

A communication pipe 24 to which a float valve 23 is attached passes through the lower part of the partition 21 so that the filtrate is automatically supplied from one chamber 13A to the other chamber 13B through the communication pipe 24. is there. By the way, float valve 2
Of course, an electromagnetic valve or the like can be used instead of 3. On the other hand, a spray tube 16 extending toward the upper space of the fermenter 1 is connected to the room 13B, and a nozzle 25 for atomizing and injecting a filtrate collected at the bottom toward the spray tube 16 is incorporated. . An air supply pipe 26 for supplying compressed air obtained by the air compressor 15 shown in FIG. 1 is connected to the nozzle 25, and a liquid supply pipe 27 for sucking up filtrate collected at the bottom of the chamber 13B is connected. You. or,
A fan 29 for blowing dry air through the duct 28 is connected to the room 13B. The heat source of the dry air may be a heater or the like.

The nozzle 25 includes a venturi 31 having a throat 30, as shown in FIG.
The supply pipe 26 is connected to one end of the venturi 31, while the supply pipe 27 is connected to the venturi 31 from the throat 30.
Protruded inside. Therefore, the filtrate is sucked out of the liquid supply pipe 27 by the compressed air passing through the throat 30, and becomes a mist and is ejected from the tip of the venturi 31.

Next, a preferred embodiment of the fermenter will be described with reference to FIG. As is clear from this figure, an input port 32 for introducing garbage is provided at the upper part of the fermenter 1, and a stirring blade 33 for stirring garbage is provided inside the inlet 32. The stirring blade 33 includes a rotating shaft 34 driven by a driving source (not shown) and a stirring rod 35 radially attached to the rotating shaft. One end of the rotating shaft 34 has a sprocket 36 for obtaining external power. Is attached. or,
The fermenter 1 is divided by a partition 37 into a primary fermentation chamber 1A having an inlet 32 and a secondary fermentation chamber 1B adjacent thereto.

Particularly, troughs 3 each having a U-shaped cross section are provided at the bottoms of the primary fermentation chamber 1A and the secondary fermentation chamber 1B.
8 and 39 are formed, and screws 40 and 41 are installed inside the respective troughs 38 and 39 in parallel with the stirring blade 33. One of the troughs 38 extends from the primary fermentation chamber 1A to one end of the secondary fermentation chamber 1B. The bottom surface of the trough 38 is a screen 42 (filter plate) having a predetermined opening ratio over the entire length. A funnel-shaped liquid reservoir 43 is formed to receive liquefied garbage that has passed through the screen 42. Then, the liquid reservoir 43 and the above-mentioned liquid receiving tank 2 are connected by a pipe 7, and a liquefied garbage in the fermenter 1 is primarily filtered by a screen 42, and then received through the liquid reservoir 43. It is configured to be accommodated in the liquid tank 2.

The screw 40 is rotated by a motor 44, and the garbage in the primary fermentation chamber 1A is sent to the left side of FIG. 4 to circulate the garbage. It is reversed to transfer to the next fermentation room 1B. On the other hand, the screw 41 is driven to rotate by a motor 45, and an outlet 46 for taking out garbage composted by fermentation decomposition in the secondary fermentation chamber 1B is formed at the tip of a trough 39 containing the screw 41.

As is apparent from FIG. 4, the filtration tank 8 has an upstream end connected to an inclined path 47 to which one end of a pipe 9 extending from the liquid receiving tank is connected, and a liquid storage section 48 formed inside the inclined path 47. A part of a partition that separates the liquid storage section 48 from the inclined path 47 is a screen 49 having a predetermined aperture ratio such as a wire mesh. In particular, the downstream end of the ramp 47 is opened into the fermenter 1, and one end of the pipe 11 extending toward the liquid receiving tank is connected to the bottom of the liquid storage 48. According to the filtration tank 8, while the liquefied garbage sent from the liquid receiving tank 2 through the pipe 9 is passed through the slope 47, it is filtered by the screen 49 and remains on the screen 49. While the cake (filter cake) is reduced into the fermenter 1, the filtrate that has passed through the screen 49 can be returned to the liquid receiver 2 through the pipe 11.

Here, the operation of the garbage disposal system configured as described above and a method of treating garbage mainly using the method of treating a garbage fermentation decomposition solution will be described. First, the inside of the fermenter 1 is heated by a heater panel (not shown), and an appropriate amount of garbage is put into the inside (primary fermentation chamber 1A) through the inlet 32. Then, the stirring wings 33 are rotated in a predetermined direction, whereby the garbage in the fermenter 1 is stirred while the motor 44 is driven to rotate the screw 40 in the predetermined direction. Room 1A
Circulate at the bottom. That is, the garbage in the fermenter 1
While being stirred by the stirring blade 33, it is sent in the direction of the rotation axis 34, and at this time, a part thereof falls into the trough 38, and is sent in the opposite direction to the stirring blade 33 by the screw 40 in the trough 38. After being squeezed, it is discharged upward from one end of the screw 40 after being squeezed, and is again stirred by the stirring blade 33.

As described above, the garbage is circulated while being repeatedly stirred by the stirring blades 33 and squeezed by the screw 40. In the process, the fermentation and decomposition by the action of microorganisms proceed. It is primarily filtered and collected in a liquid reservoir 43. Therefore, the liquefied material is sequentially extracted from the fermenter 1 through the pipe 7 and stored in the liquid receiver 2. Then, the liquefied material is subjected to secondary filtration while circulating with the filtration tank 8, and the filtrate returned to the liquid receiving tank 2 is transferred to the storage tank room 13 </ b> A by the pump 12. While the float valve 23 is activated, the next room 13B
Replenish in appropriate amounts.

While the dry air is blown into the room 13B from the fan 29 through the duct 28, the air compressor 15 is operated to supply the compressed air to the nozzle 25 through the air supply pipe 26. 1
The filtrate collected at the bottom of 3B is sprayed as a mist from the tip of the nozzle 25, and is blown into the upper space in the fermenter 1 through the spray pipe 16. Then, the vaporization of the filtrate proceeds rapidly due to the warm air due to the fermentation heat in the fermentation tank 1 and the above-described dry air, which turns into saturated steam and stays in the upper space of the fermentation tank 1. Then, the fan 18 is operated to suck out the humid air in the fermenter 1, and the filtrate contained in the humid air is carried by the airflow in the exhaust duct 17 and discharged into the solution L in the solvent tank 19. . As a result, the filtrate condenses, becomes a drain, and is mixed in the solution L.

According to the above-mentioned method, it is possible to promote the fermentation and decomposition of the garbage while keeping the garbage at a suitable amount of water, and furthermore, to reduce the amount of the garbage without requiring much time and heat. It promotes drying and prevents the collected liquefied matter (filtrate) from being discharged into public water bodies such as rivers.

Instead of releasing the moist air containing the filtrate into the liquid in the solvent tank 19, the moist air may be directly discharged to the atmosphere through the exhaust duct 17. Further, instead of the liquid reservoir 43, the liquid receiving tank 2 is formed integrally with the bottom of the fermenter 1 or the liquefaction of garbage extracted from the bottom of the fermenter 1 without using such a liquid receiving tank 2. An object (primary filtrate) may be guided to the storage tank 13 and stored in the storage tank 13. In this case, even when a large number of suspended solids are present, the solids can be separated by air separation and dropped into the fermentation tank 1 due to a difference in specific gravity when sprayed into the fermentation tank 1. On the other hand, as a spraying means for blowing the filtrate in the storage tank 13 into the upper space of the fermentation tank 1, a hydraulic nozzle that does not require air pressure can be used. Further, the fermenter 1 and the storage tank 13 are not limited to the two-tank type and may be a single-tank type. Further, the filtration tank 8 is not limited to the above-described mode as long as it is a similar device, and the installation position is not limited to the upper part of the fermentation tank 1.

[0027]

As is clear from the above description, according to the present invention, liquefied substances generated by fermentation and decomposition of garbage are sequentially extracted from the fermentation tank, and while the liquefied matter is stored in the storage tank, the upper part of the fermentation tank is removed. Since the mist is blown into the space and the sprayed liquid is discharged to the outside of the fermentation tank by the airflow in the exhaust duct, the garbage can be suitably fermented and decomposed without turning sludge into sludge. Moreover, the water content of the garbage can be reduced in a short time without consuming a large amount of heat.

Also, since the liquefied garbage extracted from the fermentation tank is filtered and stored in the storage tank,
There is no danger of clogging of the spray system, and the humid air containing the spray liquid (filtrate) is discharged from the end of the exhaust duct into the liquid in the solvent tank. Can be released to public water bodies such as rivers.

[Brief description of the drawings]

FIG. 1 is a flowchart of a garbage disposal system according to the present invention.

FIG. 2 is a schematic sectional view showing a storage tank and a solvent tank.

FIG. 3 is a schematic view of a nozzle constituting a spray unit.

FIG. 4 is a sectional view showing a preferred embodiment of the fermenter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fermentation tank 1A Primary fermentation room 1B Secondary fermentation room 2 Receiving tank 8 Filtration tank 13 Storage tank 15 Air compressor 16 Spray tube 17 Exhaust duct 18 Fan 19 Solvent tank 25 Nozzle 42, 49 Screen

Claims (3)

[Claims] 1. A fermentation tank for fermenting and decomposing garbage while stirring, a liquid receiving tank connected to the bottom of the fermentation tank for containing a liquefied substance generated by fermentation decomposition of garbage,
A storage tank for containing a filtrate obtained by filtering liquefied garbage of the garbage collected in the liquid receiving tank, and the filtrate stored in this storage tank is atomized into an upper space in the fermentation tank. And an exhaust duct for discharging the wet air containing the filtrate blown into the inside of the fermenter by the spray means to the outside, and discharges the wet air to the tip of the exhaust duct. A garbage treatment system provided with a solvent tank. 2. A method for treating a liquefied material generated by fermentation and decomposition of garbage, wherein a liquefied material of garbage is sequentially extracted from a fermenter for fermenting and decomposing garbage and stored in a storage tank. At the same time, while liquefied matter stored in the storage tank is sprayed into the upper space in the fermentation tank by air pressure, the liquefied matter is discharged to the outside of the fermentation tank by being put on an airflow in an exhaust duct connected to the fermentation tank. A method for treating a garbage fermentation decomposition solution. 3. A method for treating a liquefied material generated by fermentation decomposition of garbage, wherein a liquefied material of garbage is sequentially extracted from a fermentation tank for fermenting and decomposing garbage, and the filtrate is filtered. While the filtrate stored in the storage tank is sprayed into the upper space in the fermentation tank by air pressure, and placed in an airflow in an exhaust duct connected to the fermentation tank to the solvent tank. A method for treating a garbage fermentation decomposed liquid, comprising feeding and discharging wet air carried by an exhaust duct into the liquid in the solvent tank.