JPH11226553A - Method for decomposing solid organic substance in water by microorganism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To decompose solid organic substances such as garbage efficiently with relatively small equipment costs and power consumption by packing water, the solid organic substances, and wood chips in which microorganisms effective for decomposing the organic substances are seeded in a treatment tank and fluidizing and agitating. SOLUTION: Each treatment tank 1a, 1b is formed from concrete, a synthetic resin, and others, and a prescribed amount water and wood chips 3b and 3c for supplying carbon which is a carrier for microorganisms and a nutrition source for raising microorganisms are packed respectively in the insides of the tanks 1a, 1b. Air diffusing pipes 2a and 2b are ranged in the bottom surface of each tank 1a and 1b, compressed air from a compressor is ejected from noises 2c and 2d, a circulating flow is generated in the tanks 1a, 1b so that the water, the solid organic substances, and the wood chips 3b and 3c are fluidized and agitated in the tanks 1a and 1b. In this way, the solid organic substances C can be oxidized and decomposed efficiently, and the residue can be treated extremely simply.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used for decomposing solid organic matter such as garbage discharged from households and shops, and decomposes solid organic matter with high efficiency without generating odor by microorganisms. The present invention relates to a method for decomposing solid organic matter in water by using a microorganism.

[0002]

2. Description of the Related Art Organic waste such as municipal waste is usually treated by incineration or fermentation. By the way, it is almost impossible to incinerate garbage and the like in general households and shops, apart from the case where the garbage is continuously incinerated in a large incinerator. Further, even when fermenting garbage or the like, there is a problem that the fermentation apparatus becomes large and it is difficult to prevent the generation of offensive odor, and it is difficult to treat the garbage in an urban area.

FIG. 2 shows an example of a conventional fermentation type organic waste treatment apparatus developed for use in a building or a shopping street (Japanese Patent Laid-Open No. Hei 8-309319).
issue). In the processing apparatus, the waste 21 crushed by the crusher 20 is dehydrated by the screw type dehydrator 22, and then conveyed into the fermentation tank 24, heated by the heater 25 in the fermentation tank 24, and stirred by the stirring device 26. The waste 21 is fermented by stirring. Then, the fermented products whose weight and volume have been reduced to about 10%, respectively, are sequentially taken out of the fermentation tank 24 as compost or the like. The high-temperature exhaust gas 27 generated in the fermentation processing tank 24 is returned to the fermentation processing tank 24 dehumidified by the dehumidifier 28, and further, the wastewater 29 from the crusher 20 and the dehydrator 22 and the high-temperature exhaust gas 2
A part of 7 is introduced into the biological deodorization / drainage treatment tank 30, where it is subjected to biological deodorization treatment and then discharged to the outside.

[0004] The organic waste treatment apparatus shown in FIG.
In addition to being able to continuously process garbage of about kg / day, it can be installed in a building because there is almost no foul odor, and it has excellent practical utility.

However, the organic waste treatment apparatus itself is large (the inner volume of the fermentation treatment tank 24 is about 400 l,
The internal volume of the biological deodorization / drainage treatment tank 30 becomes about 200 l), and requires a considerable amount of electric power to drive the heater 25 and the stirring device 26. This poses a major problem in securing an installation place and reducing the treatment cost. I'm holding you. In the organic waste treatment apparatus, the fermented product (compost) Wo in an amount equivalent to 1/10 of the amount of garbage, although the volume is reduced and the volume is reduced.
Therefore, there is a problem that it is difficult to promote its practical use, in addition to the fact that the disposal thereof requires a considerable cost, and the facility cost and the maintenance management cost are expensive.

[0006]

SUMMARY OF THE INVENTION The present invention relates to the above-mentioned problems in the conventional fermentation type solid organic waste treatment apparatus,
In other words, a large space is required for installation of the processing equipment, a considerable amount of power is consumed for the operation of the equipment, and equipment complexity and maintenance costs increase due to the complexity of the equipment. A method of decomposing solid organic matter in water using microorganisms, which is capable of efficiently decomposing solid organic matter such as garbage with relatively little equipment cost and power consumption. Is provided.

[0007]

According to the first aspect of the present invention, a processing tank is filled with wood chips sown with water, solid organic matter, and effective microorganisms capable of decomposing organic substances, and water and solid organic matter in the processing tank are filled with the wood chips. The basic constitution of the invention is to decompose solid organic matter in water by fluidly stirring wood chips.

According to a second aspect of the present invention, there is provided a method according to the first aspect, wherein the effective microorganisms are aerobic microorganisms, and water, solid organic matter, and wood are blown by air blown out from an air diffuser provided at the bottom of the treatment tank. The chips are made to flow and agitate.

According to a third aspect of the present invention, in the first aspect of the present invention, the wood chips are made of cedar wood having a particle diameter of 1 to 10 mm cultivated with aerobic or anaerobic microorganisms, and are immersed in a treatment tank. The water, the solid organic matter, and the wood chips are fluidized and agitated by the stacked submersible pump.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic longitudinal sectional view of a solid organic matter underwater decomposition treatment apparatus used for carrying out the present invention.
1a and 1b are treatment tanks, 2a and 2b are air diffusers, 3
a · 3b is a wood chip, 4a · 4b is a water supply port, 5 is a garbage supply port, 6 is a pump, 7 is a treatment liquid discharge port, 8 is a treatment liquid supply port, 9 is a sludge discharge port, and 10 is a drain port. , 11a-1
1b is a generated gas discharge port.

The solid organic matter C such as garbage can be appropriately sized, for example, 10 mm × by a pre-crusher or the like (not shown).
It is crushed to a size of 10 mm × 10 mm to 50 mm × 50 mm × 50 mm, and is supplied from the garbage supply port 5 to the first treatment tank 1 a.
It is thrown in. It is needless to say that garbage and the like discharged from households and the like may be directly introduced into the processing tank 1a without passing through a crusher.

Each of the treatment tanks 1a and 1b is made of concrete, synthetic resin, or the like, and supplies a predetermined amount of water and carbon, which is a carrier of microorganisms and a nutrient source for growing microorganisms, to the inside thereof. Therefore, wood chips 3b and 3c are filled respectively. That is, the wood chips 3b and 3c are selected to have a particle size of about 1 to 10 mm, and are effective bacteria (anaerobic or aerobic microorganisms) for oxidatively decomposing organic substances.
Has been bred in advance in the wood chips 3b and 3c before filling. The effective bacteria to be bred are not limited to aerobic ones. When the insides of the treatment tanks 1a and 1b are kept anaerobic as described later, it is needless to say that anaerobic microorganisms are used. Various aquatic microorganisms such as filamentous fungi are used.

The filling amount of the wood chips 3b and 3c is selected to be about 10 to 30% of the inner volume of the processing tanks 1a and 1b, and the wood chips 3b and 3c are uniformly suspended in water when the processing tanks 1a and 1b are operated. It has become. Further, the wood chips 3
The material of b · 3c may be cedar, cypress, oak or any other material, but in this embodiment, cedar is used.

The air diffusers 2a and 2b are connected to the respective processing tanks 1a and 1
b, and compressed air A from a compressor (not shown) is injected from the nozzles 2c and 2d to generate a circulating flow in the processing tanks 1a and 1b. Solid organic matter and wood chips 3b / 3c
Is fluidized and stirred in the processing tanks 1a and 1b.

In the embodiment of FIG. 1, an aerobic microorganism is used as an effective bacterium, and air A is supplied from the air diffusers 2a and 2b.
The water in the processing tanks 1a and 1b and the wood chips 3b and 3c are fluidized and stirred by ejecting water.
When using anaerobic microorganisms as effective bacteria, diffuser tube 2
a and 2b are provided in the processing tanks 1a and 1b in place of the water and wood chips 3b and 3c.
Is caused to flow under stirring. Further, a submersible pump may be provided in place of the stirring blade or the like, and the submersible pump may form a circulating water flow in the processing tanks 1a and 1b.

Next, the operation of the organic waste treatment apparatus according to the present invention will be described. A predetermined amount of water W and wood chips inoculated with effective bacteria (aerobic microorganisms) are put into the processing tanks 1a and 1b, and the air A is supplied for a certain time (for example, 1 to 2 days). Water and wood chips 3b / 3c
Is circulated. As a result, a large amount of aerobic microorganisms adhere to and grow on the outer surfaces of the wood chips 3b and 3c and the underwater suspension in each of the processing tanks 1a and 1b.

When solid organic matter C (for example, vegetable waste) of an appropriate size is introduced into the first treatment tank 1a from the garbage supply port 5, the aerobic microorganisms propagated in the treatment tank 1a are subjected to the solid organic matter C. It attaches to organic matter and grows, so that solid organic matter itself is digested and decomposed (or oxidatively decomposed). The solid organic matter C introduced into the processing tank 1a receives mechanical stress in the process of flowing and agitating in the processing tank together with the wood chips 3a, so that the solid organic matter C is decomposed in a relatively short period of time into small pieces. By contact with aerobic microorganisms (so-called activated sludge) floating in water, they are sequentially digested and decomposed (oxidatively decomposed), and are converted into water and carbon dioxide.

Decomposition treatment of solid organic matter in treatment tank 1a
As the processing progresses, the processing liquid is discharged from the processing liquid outlet 7 by the pump 6.
The processing liquid 13 is withdrawn and supplied to the second processing tank 1b.
You. The processing liquid 13 supplied into the second processing tank 1b is
As in the case of the first treatment tank 1a, aerobic microorganisms
Therefore, it is continuously digested and decomposed, and eventually water and CO _TwoTo
Is converted.

The sludge D and the like collected below the air diffuser 2b of the second treatment tank 1b are discharged out of the treatment tank by periodically opening the sludge discharge port 9. Also, the generated CO ₂
Gases such as gas and methane are discharged from the gas outlets 11a and 11b to the outside of the tank as appropriate. Further, the processing liquid 13 in the second processing tank 1b is discharged as drain water Wo from the drain port 10 at appropriate intervals.

In the embodiment of FIG. 1, the garbage C
Is intermittently supplied into the first treatment tank 1a, and the solid organic matter C is treated by a so-called batch method. However, the garbage C is continuously supplied by a predetermined amount, and the garbage C is continuously treated. Needless to say, in this case, the operations of the pump 6, the drain valve 10a, and the like are automatically performed according to a predetermined sequence.

In the embodiment shown in FIG. 1, a first processing tank 1a and a second processing tank 1b are provided as processing tanks, and the processing liquid 13 is caused to flow and agitate by air jetted from the diffusion tubes 2a and 2b. However, it is needless to say that only one treatment tank may be used, and the treatment water 13 in the treatment tank may be agitated and flown by a submersible pump or a stirring blade. Further, the wood chips 3a and 3b are slightly decomposed by effective microorganisms with the passage of time, but the amount of decomposition is extremely small as compared with garbage and the like.
Therefore, the replenishment of the wood chips 3a and 3b may be performed only once every 10 to 12 months, and the replenishment amount may be all the wood chips 3a and 3b.
About 10 to 20 wt% of the amount b is sufficient, and no breeding of effective microorganisms is required at all.

Next, the results of an underwater decomposition test of solid organic matter using the treatment method according to the present invention will be described. First,
Concrete treatment tanks 1a and 1b each having an internal volume of 1 m ³ as treatment tanks 1a and 1b, cedar wood of about 5 mm x 5 mm (0.2 m ³ for each tank) as wood chips 3b and 3c are preferable as effective bacteria. Each aerating tube 2a using aerobic microorganisms
A processing device is manufactured in which the processing liquid 13 and the wood chips 3a and 3b are caused to flow and agitate by the jet air (about 20 l / min) A from the second processing device 2b.
50kg of garbage per day (average size 100)
(mm × 50 mm, water content: about 90%) at a rate of once / day. The pump 6 operates at a rate of once a day, and is
The processing liquid 13 containing 0 l / day of fine solid organic matter was transferred to the second processing tank 1b. Similarly, the processing liquid 13 was discharged from the second processing tank 1b from the drain port 10 and the overflow drain port 12b at a rate of about 50 l / day.

After the operation as described above is continued for three days, the BOD concentration of the effluent water Wo from the drain port 10 and the first treatment tank 1
a and the state of the solid organic matter in the second processing tank 1b were inspected. As a result, the BOD of the wastewater Wo from the second treatment tank 1b
The concentration dropped to about 20 mmg / l, indicating that the solid organic matter C was almost completely decomposed and digested in water. Further, inside the processing liquid 13 pulled out from the processing liquid discharge port 7 of the first processing tank 1a, a small amount of fine solid organic matter during decomposition remains, but the processing liquid 13 is discharged out of the processing tank as it is. It was also found that there was no risk of generating bad smell and environmental pollution. In this case, the second treatment tank 1b is unnecessary, and the decomposition treatment of the solid organic matter C is achieved only by the first treatment tank 1a.

[0024]

According to the present invention, wood chips in which water, solid organic matter and effective microorganisms have been bred are introduced into a treatment tank, and the solid organic matter is efficiently produced only by flowing and stirring these three members for a certain period of time. Since it can be oxidatively decomposed and the decomposition products are mainly water and carbon dioxide, the processing residue can be treated very easily. In addition, since only complicated stirring operation and a processing device are not required at all just by stirring and stirring water, solid organic matter and wood chips in the processing tank, the solid organic matter can be decomposed at lower cost. The present invention has excellent practical effects as described above.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an apparatus for decomposing solid organic matter in water according to an embodiment of the present invention.

FIG. 2 shows an example of a conventional fermentation type solid organic waste treatment apparatus.

[Explanation of symbols]

C is garbage (solid organic matter), W is supply water, Wo is drainage, A is air, D is sludge, 1a and 1b are treatment tanks, 2a.
2b is an air diffuser, 2c and 2d are nozzles, 3b and 3c are wood chips, 4a and 4b are water supply ports, 5 is garbage supply port, 6
Is a pump, 7 is a processing liquid discharge port, 7a is a screen, 8 is a processing liquid supply port, 9 is a sludge discharge port, 10 is a drain port, 10a
Is a screen, 10 is a drain valve, 11a and 11b are generated gas outlets, 12a and 12b are overflow drains,
13 is a processing solution.

 ──────────────────────────────────────────────────続 き Continuation of the front page (71) Applicant 598022598 Tatsuo Murakami 1-2-19 Kitahata, Abeno-ku, Osaka-shi, Osaka (72) Inventor Kiyonori Shinno 1-3-3, Komyo-bashi, Chuo-ku, Osaka-shi, Osaka Co., Ltd. Inside the Japan Technology Development Center

Claims (3)

[Claims] 1. A processing vessel is filled with wood chips sown with water, solid organic matter, and effective microorganisms that decompose organic matter, and the water, the solid organic matter, and the wood chips in the processing vessel are fluidly stirred to obtain solid organic matter. A method for decomposing solid organic matter in water using microorganisms, comprising decomposing water in water. 2. The method according to claim 1, wherein the effective microorganisms are aerobic microorganisms, and the water, the solid organic matter, and the wood chips are flow-stirred by air blown out from an air diffuser disposed at the bottom of the treatment tank. A method for decomposing solid organic matter in water using microorganisms. 3. The wood chips are made of cedar wood having a particle size of 1 to 10 mm in which aerobic or anaerobic microorganisms have been bred, and water, solid organic matter and wood chips are flown by a submerged pump immersed in a treatment tank. The method for decomposing solid organic matter in water by a microorganism according to claim 1, wherein the stirring is performed.