JPH11253976A - Method and apparatus for treating organic matter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To rapidly perform the biological decomposition of org. waste such as garbage, a Shochu(a low class Japanese alcoholic drink) waste soln., livestock excretion or the like by biologically decomposing an org. matter having a specific particle size in a mixed soln. containing air bubbles having a specific particle size and microorganisms. SOLUTION: Raw water 4 containing a solid org. matter 2 is coarsely crushed by a disposer 8 to be sent to a raw water tank 10 and a suspension containing the coarsely crushed solid org. matter is supplied to a static mixer 20. Oxygen or air from an oxygen generator 20 is compressed by a compressor 26 to be sent to the static mixer 20 and the solid org. matter is ground into a particle size of 10-50 μm herein along with oxygen or air. The mixed soln. having the solid org. matter ground by the static mixer 20, oxygen or air, microorganisms or the like suspended therein is subsequently sent into the bottom part of a reaction tower 30 through a cooler/heater 28 to be biologically decomposed. Since cells of the solid org. matter are destructed and an intracellular soln. flows out to the outside herein, biological decomposition can be rapidly advanced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating organic matter, and more particularly, to a method for treating organic waste such as garbage, shochu waste liquid, and livestock manure.

[0002]

2. Description of the Related Art In recent years, industries have rapidly developed and the population has concentrated in cities, and lifestyles and agricultural forms have changed. As a result, wastes have been generated in large amounts and intensively. When the amount of wastewater and waste generated from industry and daily life exceeds the purification ability of nature, various problems on human health and environmental conservation occur, and as a result, wastewater treatment and waste treatment have been performed. Was. Of these, waste is mainly incinerated to reduce the final disposal volume, especially in large cities.

On the other hand, in the treatment of wastewater containing organic substances, decomposition treatment by microorganisms, that is, biodegradation treatment is generally performed. This treatment has the advantage that there is no risk of secondary pollution such as air pollution due to incineration. However, since the waste to be treated needs to be a liquid, if the wastewater contains solids (for example, garbage), it is generally crushed with a mixer or disposer and then passed through a biodegradation treatment device. Can be In addition, even if the wastewater that has been pulverized to a liquid state is treated, or even if the wastewater that is already liquid is treated from the beginning, for example, shochu waste liquid, the conventional biodegradation treatment has a low efficiency of organic matter treatment. there were.

[0004]

When an organic substance is treated by biodegradation, the decomposition rate and treatment method of the organic substance differ depending on the type of microorganism used. When the microorganism used is an aerobic microorganism, the decomposition rate of organic substances is higher than that of an anaerobic microorganism. When an aerobic microorganism is used as a treatment method, air compressed by a blower or a compressor is sent into a reaction tank through an air diffuser, thereby promoting a decomposition reaction of organic substances.

[0005] In order for aerobic microorganisms to grow and activate smoothly, there is a sufficient amount of aerobic microorganism feed as an organic substance, and there are several conditions such as the amount of dissolved oxygen in the solution, the solution temperature, and the pH. Need to be optimized. It has been found that the following two conditions (1) and (2), particularly the condition (1), are particularly important in optimizing these conditions.

(1) The microorganisms are in a state of being easily biodegraded. For that purpose, it is desirable that the size of the solid organic matter in the wastewater is sufficiently small.

(2) The amount of dissolved oxygen in the wastewater is large.
For that purpose, it is desirable that the particle size of the air bubbles supplied to the wastewater is sufficiently small.

However, the above two conditions have the following problems, respectively, and it has been difficult to satisfy these conditions.

Regarding the condition (1), a large shearing force is required to pulverize solid organic matter such as garbage, and a practical conventional pulverization method that can be employed industrially is at most 200 to 50.
0 μm was the lower limit.

Regarding the condition (2), when a diffuser is used to supply oxygen to the wastewater, if the particle size of the air bubbles is reduced, the pressure applied to the diffuser increases, and from the viewpoint of pressure loss, the overall pressure increases. The device efficiency will be reduced. For this reason, it has been a limit to produce an air particle diameter of at most about 200 μm.

As described above, in any of the conditions (1) and (2), the conventional method has a limit in mechanical technology, and in the field of wastewater treatment technology, solid organic matter and air bubbles are limited. However, no attempt was made to push the reduction of the particle diameter beyond the limit of the conventional technology, and no attempt was made. Reflecting this situation,
At present, in the technical field, only equipment systems that are extremely inefficient when considered from an ideal point of view are employed.

The present inventors have conducted various studies to solve the above problems, and as a result, when a specific organic mixer is used to pulverize a solid organic substance suspension containing microorganisms, the particle diameter of the solid organic substance is reduced.
In the conventional method, the particle diameter can be made much smaller than the limit, and the particle diameter of the organic substance is reduced.
When the decomposition rate is extremely high, and when an organic suspension containing microorganisms is simultaneously pulverized with air using a specific mixer, the particle diameters of both organic substances and air bubbles are limited by conventional methods. It can be understood that the biodegradation of the organic substance suspension containing microorganisms, in which the particle diameters of the organic substance and the air bubbles are reduced, can be further greatly reduced. Then, the present invention has been completed, and an object of the present invention is to provide a method for treating an organic substance which has solved the above-mentioned problems.

[0013]

In order to achieve the above object, the present invention provides [1] biodegradation of organic substances having a particle diameter of 50 μm or less in a mixed solution containing air bubbles having a particle diameter of 10 to 50 μm and microorganisms. A method of treating organic matter,
[2] a method for treating an organic substance, which is characterized by biodegrading an organic substance having a particle diameter of 10 to 50 μm in a mixed solution having air bubbles having a particle diameter of 10 to 50 μm and microorganisms, and [3] The suspension containing the organic matter is pulverized together with air, and both the organic matter and the air bubbles have a particle size of 10 to 50.
The present invention proposes a method for treating an organic substance, wherein the method comprises the steps of:
In the method, pulverizing the suspension containing microorganisms and organic matter together with air, including performing by a static mixer, [5] In any of [1] to [4],
[6] Any of the above [1] to [5] includes using pure oxygen instead of air.

The present invention also provides [7] an oxygen supply unit for supplying oxygen or air, and a suspension water containing crushed solid organic matter and microorganisms, together with oxygen or air supplied from the oxygen supply unit. A gas-liquid mixing section which sends the solid organic matter and air or oxygen to a mixed liquid containing particles and bubbles of 10 to 50 μm, and a mixed liquid which receives the mixed liquid and is biodegraded, and And a reaction unit comprising means for returning the unit to the suspension water on the upstream side of the gas-liquid mixing unit; and
[8] an oxygen supply unit for supplying oxygen or air, a first raw water pretreatment unit for crushing solid organic matter to obtain a crushed solid organic matter, and a finely crushing the crushed solid organic matter to a particle diameter of 10 μm
A second raw water pretreatment section for obtaining the following finely divided solid organic matter,
Suspended water containing the finely divided solid organic matter and microorganisms is received and sent to a static mixer together with oxygen or air supplied from the oxygen supply unit, and the solid organic matter and air or oxygen are dispersed in particles of 10 μm or less and bubbles of 10 to 50 μm. And a means for receiving and biodegrading the mixed solution and returning a part of the mixed solution undergoing biodegradation to the suspension water upstream of the gas-liquid mixing unit. And an apparatus for treating organic matter comprising a reaction section.

Hereinafter, the present invention will be described in detail.

[0016]

BEST MODE FOR CARRYING OUT THE INVENTION The method for treating organic substances according to the present invention is a method for treating organic substances by biodegrading solid organic substances having a particle diameter of 50 μm or less or 10 to 50 μm, air bubbles having a particle diameter of 10 to 50 μm, and microorganisms. It is. In order to make the particle diameters of the organic matter and the air bubbles respectively 10 to 50 μm, it is desirable to simultaneously pulverize the organic matter suspension containing microorganisms together with air.

The decomposition rate of the organic substance tends to increase as the particle diameter of the organic substance decreases.
μm or less or 10 to 50 μm is preferred. When the particle diameter of the organic substance exceeds 50 μm, the decomposition rate of the organic substance becomes slow, which is not preferable. In addition, when simultaneously crushing microorganisms and solid organic matter, when finely crushing to a particle diameter of less than 10 μm, there is a risk that the microorganisms may be crushed and destroyed,
Not preferred. However, the solid organic matter should be in advance with a particle diameter of 10 μm.
When the finely pulverized solid organic matter is obtained by pulverizing the finely divided pulverized powder to a smaller amount and the microorganism is mixed with the finely pulverized solid organic matter, the decomposition rate of the organic matter is further increased, which is preferable.

The organic matter to be treated is not limited to organic waste as long as it is to be treated. In recent years, however, human health and environmental preservation have been particularly emphasized. Processing is important. Solid organic waste (eg, garbage)
It is even more important to treat solid organic waste, for example, because it was difficult even in the conventional method to make a liquid compared with a liquid that was already liquid from the beginning, such as shochu waste liquid. . Further, among the solid organic wastes, there are organic substances having hard cell walls, such as raw vegetables, that is, solid organic substances that require a large shearing force for pulverization. The treatment method of the present invention may be applied to a particle diameter of 50 μm or less or 10 to 50 μm.
In this case, solid organic matter such as vegetables is mechanically destroyed in cell walls, and solutes in the cell walls flow out. Microorganisms can concentrate on the biodegradation of the effluent solutes and require very little effort to destroy the cell wall, thereby significantly promoting the decomposition reaction of solid organic matter. In contrast, the conventional method has a pulverization limit of 200 to 5 at most.
00 μm. The cell wall is hardly destroyed. For this reason, microorganisms spend most of their effort in destroying the cell wall, and it takes a long time to biodegrade solutes in the cell wall.

As described above, it has not heretofore been practiced to finely pulverize an organic substance to a particle diameter at which biodegradation is likely to occur by microorganisms. However, the present inventors pulverize a solid organic substance to a predetermined particle diameter. By doing so, it has been found that biodegradation can be performed with higher efficiency than ever before. The solid organic matter may be pulverized by any method. However, solid organic matter can be pulverized by using a specific mixer such as a static mixer.

The static mixer is a static mixer having no mechanically driven agitator and no mechanically movable part. The mechanism of this mixer basically consists of "division-position movement-superposition", and a bow tie-like element group is built in the mixer tube. When the number of built-in elements is 20, the number of divided layers is about 1.05 million (1.05 × 10 ⁶ ). here,
The number of divided layers is used as an index indicating the performance of a mixer such as a static mixer. When this static mixer was first developed, it caused a strong impact on the industrial world, but the performance of the mixer was still insufficient when the number of divided layers was about 1.05 million. However, in a recently developed static mixer having a trade name of "Rummon Super Mixer RM09A070L" manufactured by Environmental Science and Technology Co., Ltd., the number of the divided layers is 6 units and 4.
An order of magnitude of 5 × 10 ²⁴ was obtained. Here, one unit is composed of a pair of a proliferation and diffusion side in which the fluid entering from the center radially spreads radially toward the circumference, and a collection side on the back side oppositely directed from the circumference to the center. And
It is based on a new mixing principle.

With respect to air, the smaller the particle size of the air bubbles, the higher the dissolved oxygen amount in the liquid, the slower the air bubble floating speed, and the more the dissolved oxygen amount in the liquid is accelerated. The decomposition rate of organic matter tends to increase. on the other hand,
As described above, in the present invention, since solid organic matter is finely pulverized to a particle size that is likely to undergo biodegradation by microorganisms, a high rate of organic matter decomposition can be obtained even with air bubbles using a conventional air diffuser. However, in order to further increase the decomposition rate of the organic substance, it is preferable that the particle size of the air bubbles is 10 to 50 μm. If the particle size of the air bubbles exceeds 50 μm, the amount of dissolved oxygen in the liquid decreases, and the rate of decomposition of organic substances is undesirably reduced. Further, in the method of the present invention, the particle diameter of the air bubbles can be reduced to submicron depending on the conditions, but if the particle diameter of the air bubbles is less than 10 μm, there is a possibility that the microorganisms may be crushed and destroyed. There is not preferred. According to the method of the present invention, air can be sufficiently achieved to increase the amount of dissolved oxygen in the liquid, but when pure oxygen is used instead of air, the amount of oxygen in the liquid increases more easily. The decomposition rate of organic matter is faster,
More preferred.

In the present invention, the particle diameter of the solid organic matter and air bubbles is reduced to 50 μm or less or 10 to 50 μm by any method.
m. However, by using a mixer such as the above-described static mixer, the particle size of the air bubbles can be easily reduced as in the case of pulverizing solid organic matter.

In order to make the particle diameters of the solid organic matter and the air bubbles to be 50 μm or less or 10 to 50 μm, respectively, the organic matter suspension containing the microorganisms is simultaneously pulverized with air in a mixer such as the aforementioned static mixer. ,
This method is desirable because it can be achieved.

As the microorganism, an aerobic microorganism is used. According to the method of the present invention, the concentration of microorganisms is almost constant during the organic matter treatment, though there are some fluctuations, so that the microorganisms contained in the organic matter suspension are repeatedly replenished or hardly extracted or removed. It can be used by circulating. Further, the solid organic matter can be pre-pulverized by a simple mixer such as a mixer or a disposer together with the culture liquid of the microorganism, and the obtained pre-pulverized mixture can be charged into a circulating organic substance suspension in the system. . Furthermore,
In some cases, the amount of organic matter in the charge and the amount of substance evaporating from the circulating organic matter suspension during the processing of the organic matter are substantially the same. In that case, additional supplementation of the culture solution of the microorganisms into the system or extraction of the circulating organic suspension from the system is almost unnecessary, and a predetermined amount of the pre-ground mixture is allowed to flow for a predetermined time. Each time, the organic material can be continuously treated by charging the organic material in the circulating organic material suspension in the system. This means that the concentration and volume of microorganisms in the mixture circulating in the system are almost constant,
It means that only the organic matter charged in the system was biodegraded and evaporated from the system.

The present invention will be described below with reference to the drawings.

FIG. 1 is a flow chart showing an example of the organic substance processing apparatus of the present invention. In FIG. 1, I is a raw water pretreatment unit, and raw water 4 containing solid organic matter 2 is a waste input hopper 6
It is thrown into. The hopper 6 is also supplied with a part of a mixed solution sent from a reaction section described later. The mixed liquid contains microorganisms therein. The raw water is first sent to a disposer 8, where it is crushed. The suspension containing the crushed solid organic matter is sent to the raw water tank 10. The suspension sent to the raw water tank is returned to the waste input hopper as needed.
This returned suspension is sent again to the disposer and further crushed. This crushing operation is repeated, and the suspension containing the solid organic matter crushed into particles of about 1 mm is sent from the raw water tank through the strainer 12 to the gas-liquid mixing section II. That is, the suspension is supplied to the first switching valve 14, the flow meter 17
The gas is supplied to the static mixer 20 of the gas-liquid mixing section II sequentially through the second switching valve 16 and the third switching valve 18 to which is attached.

Reference numeral III denotes an oxygen supply unit. Oxygen or air from the oxygen generator 22 passes through a fourth switching valve 24, is pressurized by a compressor 26, and then sent to a third switching valve 18.
Here, after being mixed with the suspension, the mixture is sent to the static mixer 20 together with the mixed liquid, where the solid organic matter and oxygen or air are pulverized to a particle size of 10 to 50 μm. Since the microorganisms are smaller than 10 μm, they are not pulverized by the mixer 20.

IV is a reaction section, and a mixed liquid in which solid organic matter, oxygen or air, microorganisms and the like pulverized by the mixer 20 are suspended is then passed through the cooling / heating device 28 of the reaction section IV to form a reaction tower. From the bottom of 30, it is sent into the reaction tower where it undergoes biodegradation.

The biodegradation reaction in the reaction tower 30 proceeds very quickly because the cells of solid organic matter are destroyed and the intracellular fluid flows out. Further, since air or oxygen is also in a state of fine bubbles, the rate of rise in the mixed liquid is low, so that oxygen can be sufficiently supplied to the mixed liquid.

Here, 32 is a stirrer for stirring the inside of the reaction tower,
34 is a sensor for detecting the state of the mixed liquid in the reaction tower 30, 36 is a deodorizer, 38 is a third on-off valve, 40 is a fourth on-off valve, 42 is a fifth on-off valve, and 44 measures the weight of the reaction tower. Load cell. A part of the mixed solution in the reaction tower 30 is constantly or intermittently maintained during the reaction,
It is sent to the first switching valve 14 through the fifth switching valve 48,
The gas passes through the switching valve 16 and the third switching valve 18 and further passes through the gas-liquid mixing section I.
After passing through the static mixer 20 of I and the cooling / heating device 28, the circulation route sent from the bottom of the reaction tower 30 into the reaction tower 30 is repeatedly circulated. During the circulation, each time the mixed liquid passes through the static mixer 20 of the gas-liquid mixing section II, the solid organic matter remaining incompletely crushed is further crushed, and fine air or oxygen bubbles are sufficiently supplied. Biodegradation in the reaction tower 30 is ensured.

The fifth switching valve 48 can supply the mixture in the reaction tower 30 to the charging hopper 6 by switching the fifth switching valve 48, thereby facilitating the pulverization of the solid organic matter in the disposer 8. Things.

FIG. 2 is a flowchart showing another example of the apparatus for treating organic matter according to the present invention. In the processing apparatus of FIG.
The oxygen supply section III and the reaction section IV of the gas-liquid mixing section II are the same as those in the apparatus shown in FIG. The raw water pre-processing section I in the processing apparatus of FIG. 1 includes a first raw water pre-processing section IA and a second raw water pre-processing section IB in the processing apparatus of FIG. In the first raw water pretreatment section IA, as in the raw water pretreatment section I in the treatment apparatus of FIG. 1, the solid organic matter to be treated is coarsely crushed into particles of about 1 mm, and the coarsely crushed solid organic matter Is sent to the second raw water pretreatment section IB. That is, the suspension is supplied to the static mixer 13 of the second raw water pretreatment section IB, and is finely pulverized into particles of 10 μm or less. The suspension containing the finely pulverized solid organic matter is sent to the gas-liquid mixing section II, and is thereafter subjected to the same operation and processing as the processing apparatus in FIG.

[0033]

EXAMPLES Hereinafter, the present invention will be described specifically and in detail with reference to examples, but the present invention is not limited to the examples.

Each physical property value was measured by the following method.

Dissolved oxygen content (DO): Measured using a portable dissolved oxygen meter DO-14P manufactured by Toa Denpa Kogyo KK

Total organic carbon concentration (TOC): Measured using TOC-5000 manufactured by Shimadzu Corporation.

TOC (GF): The amount of organic carbon in the filtrate when filtered through a 0.22 μm glass filter. This does not include microorganisms, and indicates the amount of organic carbon other than microorganisms.

Ammonia nitrogen concentration: measured using a composite electrode type 9307BN manufactured by AII Orion.

Nitrate nitrogen concentration: Measured using a membrane electrode 95-12BN manufactured by AII Orion.

Test Example 1 5 L of water was boiled for 5 minutes to adjust the dissolved oxygen content to 2.3 mg / L, and the whole amount of 5 L of the boiled water was transferred to a Ramond Super Mixer RM09A070L (manufactured by Environmental Science Industry Co., Ltd.). Let it pass. This passing operation condition is that the air flow rate is 1 L
/ Min, total flow rate (including air flow rate) 12.5 L / mi
n, the pump pressure was 10 kg / cm ² , and it took 29.4 seconds to pass the entire amount. The amount of dissolved oxygen was measured using this passing liquid as the “first passing liquid”. Next, the whole amount of the “first pass liquid” is again passed through the above-mentioned Ramond super mixer to obtain a “second pass liquid”, and the “second pass liquid” is obtained.
Was measured for dissolved oxygen content. Further, the “second pass liquid” was similarly passed through the above-mentioned Lamond supermixer to obtain a “third pass liquid”, and the dissolved oxygen amount of the “third pass liquid” was measured. Table 1 shows the measurement results for each “passing liquid”.

From the results shown in Table 1, it was found that the amount of dissolved oxygen approaching saturation was reached by passing the boiling water once through the above-mentioned Ramond supermixer.

[0042]

[Table 1] Test Example 2 5 L of the microbial culture solution was passed three times through the above-mentioned Lamond supermixer under the same passing operation conditions as in Test Example 1, and "1.
~ 3rd passage liquid ", the dissolved oxygen amount, the total organic carbon concentration, etc. were measured for each passage liquid.
Shown in

From the results shown in Table 2, it can be seen that the microorganisms can reach a dissolved oxygen amount of about half of saturation even though the microorganisms consume a large amount of dissolved oxygen by passing the microorganism culture solution only once through the Ramond supermixer. I understand. In addition, it was confirmed that the microorganism was alive without being crushed.

[0044]

[Table 2] Undiluted solution preparation 1.5 kg of Chinese cabbage, 0.5 kg of spinach, 2 kg of vegetables, and 4 kg of microbial culture solution were applied to the disposer 10 times (10 seconds / time) and the mixer once (30 seconds / time).
It was pulverized to 1-2 mm to obtain an organic stock solution. This undiluted organic substance solution was repeatedly circulated through the above-mentioned Lamond supermixer for 8 minutes, sampled every 2 minutes, and the total organic carbon concentration of each sample was measured. The results are shown in Table 3.

[0045]

[Table 3] Example 1 A mixture of 2 L of the organic stock solution and 9 L of the microorganism culture solution was charged as a mixture into the organic matter treatment apparatus shown in FIG.
The mixture was repeatedly circulated and passed through the Ramond Supermixer with air. At this time, the air flow rate was 1 L / m through the above-mentioned Lamond super mixer.
in aeration, sampling every predetermined time, measuring the total organic carbon concentration, etc. for each sample,
Table 4 shows the results.

From the results shown in Table 4, the mixed liquid and the air were repeatedly circulated and passed through the Ramond supermixer to reduce the particle diameters of the organic substances and the air bubbles at the same time. Biodegradation proceeds much faster than in the case of aeration from the bottom diffuser, the total organic carbon concentration and TOC (GF) decrease instantaneously, and the dissolved oxygen content also becomes 5 mg / L after about 4.5 hours. As described above, it is recognized that the biodegradation treatment of the charged organic matter has been completed.

[0047]

[Table 4] Comparative Example 1 Rather than aerating with air passed through a Lamond supermixer, but aerating from a diffuser at the bottom of the reactor,
A mixture of 3.8 L of the organic stock solution and 17.1 L of the microorganism culture solution was charged as a mixture into the same organic matter treatment apparatus as in Example 1, and the mixture was repeatedly circulated and passed through the Ramond supermixer. At the same time, aeration was performed at an air flow rate of 23 L / min by a diffuser at the bottom of the reaction tower. As in the first embodiment, sampling is performed at predetermined time intervals,
For each sample, the total organic carbon concentration and the like were measured, and the results are shown in Table 5.

From the results shown in Table 5, by repeatedly circulating and passing the mixture through the Ramond supermixer, the total organic carbon concentration and TOC (GF) can be maintained even with the aeration from the aeration tube at the bottom of the reaction tower. It decreased at a higher speed than in the case where the almond super mixer of Comparative Example 2 described later was not used at all. However, the dissolved oxygen amount is 5mg
/ L or more, and it took about 12 hours for the biodegradation treatment of the charged organic matter to be recognized as completed.

[0049]

[Table 5] Comparative Example 2 A mixture of 3 L of an organic stock solution and 18 L of the microorganism culture solution prepared by the same method as that for the above-mentioned organic stock solution was charged into a reaction tower, and an air flow rate of 50 L was supplied through a diffuser at the bottom of the reaction tower.
Aeration was performed at L / min, sampling was performed at predetermined time intervals, and the total organic carbon concentration and the like were measured for each sample. The results are shown in Table 6.

From the results shown in Table 6, when only the aeration from the aeration tube at the bottom of the reaction tower was used and the Ramond Supermixer was not used, the total organic carbon concentration and TOC (GF) decreased, and the amount of dissolved oxygen also decreased. Is more than 5mg / L,
It took time. It was about 24 hours after the completion of the biodegradation treatment of the charged organic matter. This can be interpreted as that, as described above, microorganisms consumed a lot of effort to destroy the cell wall, and it took a long time to start biodegradation of solutes in the cell wall.
Further, the particle size of the air to be aerated from the air diffuser is 300 to 50.
It was as large as 0 μm, and in addition to the low oxygen utilization efficiency, the processing time was increased.

[0051]

[Table 6] Example 1 and Comparative Example 1 by comparing each data of Tables 1 to 6
Table 7 summarizes Tables 2 and 3. As is clear from Table 7, when compared by air efficiency, the effect under the conditions of Example 1 and Comparative Example 1, particularly the effect under the conditions of Example 1, is remarkable.

[0052]

[Table 7] * 1 Vegetable input ratio: Microbial culture liquid (L) ÷ treatment target (kg) * 2 Air flow ratio: Air flow (L / min) ÷ treatment target (kg) * 3 Air efficiency ratio: Defined by the following formula The air efficiency coefficient is determined for each example or comparative example, and the relative ratio is calculated with reference to comparative example 2, that is, as 1 Table 8 shows the results of the carbon removal rate and the transpiration rate when the treatment of the mixed liquid was performed under the conditions of Example 1 for 292 minutes. FIG. 3 shows the change with time of the result.

In this result, as shown in FIG. 3, a large amount of bubbles are generated during the processing of the mixed liquid, and the measurement of the amount of the bubbles and the sampling of the bubbles are likely to cause errors. An error of about ± 5% occurs, but the processing time is about 5%.
Despite the short time, both carbon removal rate and transpiration rate are 100%
Before and after results were obtained.

From the above results, the carbon removal rate and the transpiration rate were 1
When it is about 00%, there is almost no need to additionally replenish the microbial culture solution into the system or withdraw the circulating mixture from the system. By charging the mixture in the circulating mixture in the system at predetermined time intervals, the treatment of organic substances can be performed continuously.

[0055]

[Table 8]

[0056]

According to the present invention, in biodegradation, the particle diameter of solid organic matter and the oxygen or air bubbles to be supplied is reduced to 50%.
Since the thickness is set to not more than μm or 10 to 50 μm, the biodegradation treatment can be performed very quickly. A specific mixer,
In the case of using a static mixer, especially a Ramond super mixer having a high mixing performance among the static mixers, the particle size of both organic matter and air bubbles is reduced by simultaneously crushing a solid organic matter suspension containing microorganisms together with air. In addition, it is possible to make the particle diameter much smaller than the particle size which has been regarded as a limit in the conventional method. And
The biodegradation of the mixed organic material containing the reduced organic material and air bubbles is extremely fast.

In the present invention, the concentration of microorganisms is substantially constant during the treatment with organic substances. That is, the solid organic matter is completely decomposed into water and carbon dioxide, and does not generate excess sludge.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an example of an organic substance processing apparatus of the present invention.

FIG. 2 is a flowchart showing another example of the organic substance processing apparatus of the present invention.

FIG. 3 is a graph showing time-dependent changes in measured values such as the carbon concentration and the amount of bubbles in Example 1.

[Explanation of symbols]

 I Raw water pretreatment section IA First raw water pretreatment section 2 Solid organic matter 4 Raw water 6 Waste input hopper 8 Disposer 10 Raw water tank 11 First open / close valve 12 Strainer IB Second raw water pretreatment section 13 Static mixer II Air Liquid mixing unit 14 First switching valve 16 Second switching valve 17 Flow meter 18 Third switching valve 19 Flow meter 20 Static mixer III Oxygen supply unit 22 Oxygen generator 24 Fourth switching valve 26 Compressor IV reaction unit 28 Cooling / heating unit 30 reaction tower 32 stirrer 34 sensor 35 ORP / pH meter / thermometer / other instruments 36 deodorizer 38 third on-off valve 40 fourth on-off valve 42 fifth on-off valve 44 load cell 46 second on-off valve 48 fifth switching valve

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshiro Kamokawa 628-2, Sugiyacho, Nijo Shimojo, Sakaimachi, Nakagyo-ku, Kyoto, Kyoto Prefecture Toyo Environmental Research Institute, Inc. (72) Inventor Tomio Niimi Nagoya, Aichi 2-2, Shiga-Nantori, Kita-ku, Yokohama 2 Environmental Science & Technology Corporation

Claims (8)

[Claims] 1. A method for treating an organic substance, wherein an organic substance having a particle diameter of 50 μm or less is biodegraded in a mixed liquid containing air bubbles having a particle diameter of 10 to 50 μm and microorganisms. 2. A method for treating an organic substance, comprising biodegrading an organic substance having a particle diameter of 10 to 50 μm in a mixed liquid having air bubbles having a particle diameter of 10 to 50 μm and microorganisms. 3. A suspension containing microorganisms and organic matter is pulverized together with air, and the organic matter and air bubbles have a particle size of 10 to 5 times.
A method for treating organic matter, wherein the organic matter is reduced to 0 μm and biodegraded. 4. The method for treating an organic substance according to claim 3, wherein the pulverization of the suspension containing the microorganisms and the organic substance together with air is performed by a static mixer. 5. The method according to claim 1, wherein the microorganism is an aerobic microorganism.
5. The method for treating an organic substance according to any one of claims 1 to 4. 6. The method according to claim 1, wherein pure oxygen is used instead of air.
6. The method for treating an organic substance according to any one of claims 1 to 5. 7. An oxygen supply unit for supplying oxygen or air,
Suspended water containing crushed solid organic matter and microorganisms is received and sent to a static mixer together with oxygen or air supplied from the oxygen supply unit. The solid organic matter and air or oxygen contain particles and bubbles of 10 to 50 μm. A reaction unit comprising: a gas-liquid mixing unit that forms a mixed solution; and a unit that receives and biodegrades the mixed solution and returns a part of the mixed solution undergoing biodegradation to suspended water upstream of the gas-liquid mixing unit. An organic matter processing device comprising: 8. An oxygen supply unit for supplying oxygen or air,
A first raw water pretreatment section for crushing the solid organic matter to obtain a crushed solid organic matter;
A second raw water pretreatment section for obtaining finely divided solid organic matter of 0 μm or less, and receiving the suspension water containing the finely divided solid organic matter and microorganisms, feeding the suspension water with oxygen or air supplied from the oxygen supply section to a static mixer, Organic matter and air or oxygen are 10 μm or less particles and 10 to 50 μm
A gas-liquid mixing section that converts the mixed liquid into a mixed liquid containing air bubbles, and a means for receiving and biodegrading the mixed liquid and returning a part of the mixed liquid undergoing biodegradation to the suspension water upstream of the gas-liquid mixing section. And a reaction unit provided with the organic substance.