JP2003103286A - Decomposition treatment agent for organic wastewater and organic wastewater treatment method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a decomposition treatment agent capable of efficiently decomposing organic wastewater in a storage tank such as a grease trap or the like, and a method for decomposing organic wastewater using the decomposition treatment agent. SOLUTION: The decomposition treatment agent is constituted of aerobic bacteria and a surfactant. The surfactant has a function emulsifying organic matter containing oils and fats as an emulsifier to form an emulsion. Aerobic bacteria decompose the emulsified organic matter. As the surfactant, a biodegradable one capable of being decomposed by aerobic bacteria is selected. In addition, a chelating agent, a pH controller, a defoaming agent or a fungicide can be added. A stirrer 2 is used in the grease trap 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a decomposition treatment agent used for treating organic wastewater discharged from restaurants, and a treatment method using the decomposition treatment agent.

[0002]

2. Description of the Related Art In the conventional method for treating organic wastewater,
The aerobic bacteria were added to the storage tank such as the grease trap, and the waste water stored in the tank was aerated. This is because it is necessary to send air to the wastewater in order to activate the activity of the aerobic bacteria, and these bacteria decompose organic matter to treat the wastewater. And the treating agent used here contained a plurality of aerobic fungi which are said to decompose organic substances.

By the way, wastewater discharged from restaurants and the like was called organic wastewater containing a large amount of fats and oils. It is not allowed to discharge such organic wastewater directly into the sewage, and by using a water tank called a grease trap, the oils and fats are levitated from other drainages by floating the oils and fats while storing the organic wastewater. It was separated, and only the wastewater that did not contain oils and fats was discharged. Further, regarding the treatment of residual oils and fats, organic matter decomposing microorganisms are appropriately added to decompose, and after the decomposition, they are discharged together with other waste water.

As described above, aerobic bacteria are used for decomposing oils and fats in the grease trap, and in order to activate the aerobic bacteria actively, in a grease trap or a decomposition treatment tank installed individually, A device was provided for aeration.

[0005]

However, in the prior art as described above, since oils and fats and the like are stored in the grease trap while being floated, the oils and fats and the like are solidified by the decrease in the water temperature. Since the added microorganisms such as aerobic bacteria cannot receive sufficient oxygen supply, they have died without performing sufficient activity.
Even when an aerator for supplying oxygen is provided, when the oils and fats floating near the water surface are solidified,
The microorganisms cannot contact with oils and fats, etc., the microorganisms cannot perform sufficient activity, and the effect of activating the microorganisms by aeration cannot be obtained.

Therefore, oils and fats which have not been decomposed by microorganisms are gradually accumulated inside the grease trap and cause an offensive odor, while organic wastewater containing oils and fats is discharged. . Finally, in order to solve the above problems, the solidified fats and oils were finally removed by an artificial method, but the removal work of these must be done frequently and manually. Therefore, it was harsh.

The present invention has been made in view of the above points, and an object thereof is to provide a decomposition treatment agent capable of efficiently decomposing organic wastewater in a storage tank such as a grease trap. And to provide a method of decomposing an organic wastewater using this decomposition treatment agent.

[0008]

SUMMARY OF THE INVENTION An organic waste water decomposition treating agent according to the present invention is summarized as containing an aerobic bacterium and a surfactant, and the decomposition treating agent contains a pH adjusting agent, or The main point is to include an antifoaming agent. Further, depending on the type of organic wastewater to be decomposed, a chelating agent may be contained in addition to the above decomposition treatment agent.

Further, the method of decomposing organic wastewater according to the present invention is characterized in that 0.01% or more of the above decomposition treating agent is added to organic wastewater containing less than 0.1% of organic matter, The gist is that the organic wastewater is continuously stirred in a container such as a grease trap for storing the organic wastewater. In this case, in the decomposition treatment in the grease trap, it is preferable to continuously stir the organic wastewater for 6 to 12 hours.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. In the present embodiment, a decomposition treatment agent composed of an aerobic bacterium and a surfactant is basically used, and the surfactant is an emulsifier that emulsifies an organic substance containing fats and oils to form an emulsion. Is. In addition, biodegradable surfactants that can be decomposed by aerobic bacteria are used.

Further, the decomposition treatment agent of this embodiment is used for decomposing the wastewater containing oils and other organic substances accumulated in the grease trap used in restaurants (hereinafter referred to as organic wastewater). In the inside of the grease trap, the product of the invention relating to the organic waste water treatment apparatus of Japanese Patent Application No. 2001-210018 previously filed by the applicant is used. As shown in FIG. 1, the outline of the above organic wastewater treatment apparatus is, as shown in FIG. 1, a base 21 placed on the bottom of the grease trap 1, a submersible pump 22 placed on the base 21, and a submersible pump 22. Suction path 23 for forcibly sucking organic wastewater by
A drainage channel 24 for draining this is provided, and a suction port 25 is provided at the tip of the suction channel 23, and jet ports 26, 27 are provided at the tip of the drainage channel 24, respectively.

On the water surface of the organic waste water flowing into the grease trap 1, fats and oils and other organic substances (hereinafter,
Since organic substances such as oils and fats) are floated and accumulated, even if the whole wastewater stored in the grease trap 1 is stirred or aerated, it is not possible to emulsify the floating lumps of oils and fats. It was difficult. That is, when stirring or aerating below the above-mentioned fats and oils, the above-mentioned fats and oils have no change in the floating state, and only the wastewater located below the said fats and oils is stirred. Therefore, in the organic wastewater treatment apparatus of the invention described above, the organic substances such as fats and oils floating inside the grease trap 1 are sucked from the suction port 25, and the organic substances such as fats and oils are floated in the layer. Although it does not agitate the entire wastewater stored in the grease trap 1, it can emulsify organic substances such as fats and oils and mix it with other wastewater.

Here, as aerobic bacteria having an action of decomposing organic matters including oils and fats, Bacillus genus, Pseudomonas (Pseudomonas)
Genus, Alcaligenes, M
There is a genus icrococcus, etc., and in the present embodiment, at least 1 is selected from these fungi.
What is selected is one that can decompose organic substances such as fats and oils, and can be put into a dormant state for 3 months or more in an aqueous solution even when blended with a surfactant.

On the other hand, as the surface active agent, a nonionic surface active agent or an anionic surface active agent is used, and at least one kind is selected and used. In some cases, a combination of each of the above nonionic surfactants and anionic surfactants may be used.

As the nonionic surfactant, polyoxyethylene sorbitan monooleate, polyoxyethylene sorbitan monolaurate, polyoxyethylene sorbitan monostearate, polyoxyethylene oleyl ether, polyoxyalkylene alkyl ether, Examples thereof include polyoxyethylene alkyl ether, and examples of the anionic surfactant include sodium lauryl alcohol ether sulfate, sodium polyoxyethylene sulfonate, lauroyl sarcosinate, and sodium polyoxyethylene alkyl ether sulfate.

Further, when the aerobic bacterium or the surfactant described above is added to the organic wastewater, a pH adjuster for adjusting the pH value of the entire organic wastewater is used. Although aerobic bacteria can act without dying in an environment with a low pH value (under acidic conditions), their activity is not always active.
In addition, oils and fats may not be sufficiently dispersed even when stirred in the grease trap. On the other hand, in an environment with a high pH value (under alkaline), oils and fats are dispersed by stirring in the grease trap, so that emulsification by the surfactant is promoted and very active in weak alkaline. There are aerial bacteria, but on the other hand,
It has the property that it becomes inactive at all due to death when the degree of alkalinity increases. Therefore, a pH adjusting agent is added to the decomposition treatment agent to prevent the aerobic bacteria from being killed and to promote the dispersion of oils and fats in the grease trap.

Here, an environment of pH 8 is preferable,
The pH adjusting agents used for this purpose include the following. That is, when the pH value is higher than 8, organic acids such as citric acid or malic acid can be used, while when the pH value is lower than 8, sodium hydroxide or potassium hydroxide is used. can do. Note that the material is not limited to these, and any material that can adjust the pH is sufficient.

When the organic wastewater contains metal ions such as calcium or magnesium, these metal ions easily bind to the surface active agent, which reduces the effect of the surface active agent. Had been impaired to inhibit the emulsification of. Therefore, when treating organic wastewater containing metal ions, a chelating agent is used to remove the metal ions. Since ethylenediaminetetraacetic acid, which is generally used as a chelating agent, is difficult to decompose, it affects the activity of aerobic bacteria, and for the purpose of avoiding drainage to general sewage, in the present embodiment, it is biodegradable. It is necessary to use good L-glutamic acid diacetic acid or L-aspartic acid diacetic acid.

Further, in this embodiment, as described above,
Since the decomposition treatment is performed in the grease trap while stirring and the surfactant is used, bubbles may be generated in the grease trap. In such a case, an antifoaming agent is used. In addition, organic substances such as oils and fats are accumulated inside the grease trap before treatment, and in a hot and humid season, molds may propagate in a short time.In such a case, It is also possible to use fungicides.

[0020]

[Examples] Examples of specific treating agents will be described below.
The first example is an aqueous solution containing aerobic bacteria and a surfactant. Here, first, in order to select the surfactant necessary for decomposing the organic waste water discharged from the restaurant, the emulsified state when the above surfactant was used was tested. The experiment method was as follows: 2.5 g of beef tallow and 2.5 g of lard were added to 50 ml of a 1% solution of a surfactant according to the experiment, mixed by stirring for 30 seconds, and the emulsified state after 5 minutes was visually observed. The results are shown in Table 1.

[0021]

[Table 1]

From the results shown in Table 1, it was found that although some of the surfactants were not emulsified, they were generally emulsified,
It was also found that emulsification occurs when two types of surfactants are mixed.

Next, the decomposition state of the organic wastewater containing fats and oils was tested using an aqueous solution prepared by adding aerobic bacteria to the surfactant which showed good results in the above experiment. Here, in order to understand the activity status of aerobic bacteria by mixing with a surfactant, the decomposition status of lard and rapeseed oil was tested while changing the type of aerobic bacteria. The experimental method is as follows: Microbial agent for experiment (10 ⁶ to 10 ¹² aerobic bacteria / g) 2 m
l, 0.2 g of experimental oil and 0.03 g of surfactant were added to water to make the whole 200 ml, and the temperature was 30 ° C.
The oil decomposition rate after shaking tow culture for 6 hours was measured. The results of this experiment are shown in Table 2. The oil decomposition rate is
The content of the normal hexane extract before the start of the culture was measured in advance, the content of the normal hexane extract after the shaking tow culture was measured, and the reduction rate was calculated (the same applies to the calculation method of the oil decomposition rate below. ).

[0024]

[Table 2]

From the above experimental results, Alcaligen
When es faecalis was used alone, the decomposition rate of lard was poor, but when other aerobic bacteria were used, it was effective in decomposing oil. And the above Al
It was found that the effect of oil decomposition is improved by using caligenes faecalis in combination with Bacillus subtilis which is another aerobic bacterium.

Then, the same experiment was conducted on olive oil and soybean oil by combining the above two kinds of aerobic bacteria, and the results shown in Table 3 were obtained.

[0027]

[Table 3]

From the above results, Bacillus su
btilis and Alcaligenes faecal
It has been found that when combined with is, the effect of degradation is good for both olive oil and soybean oil.

By summing up the above experimental results,
As a surfactant, except for polyoxyethylene polyoxypropylene condensate and polyoxyethylene sorbitan monooleate, the emulsification is excellent and Bacil
lus subtilis and Alcaligenes
It was obtained that the fats and oils could be sufficiently decomposed by the microbial agent combined with faecalis. Therefore, in order to verify whether these combinations have an effect on actual drainage, an experiment was conducted on drainage in an actual restaurant. The results are shown in Table 4.
This result shows that the above result is reflected.

[0030]

[Table 4]

From the above results, it was found that when treating the wastewater of the restaurant used in this experiment, a good decomposition state was obtained by adding 33% by weight of the surfactant. Moreover, No. of the processing agent composition example shown in the decomposition table 4 is shown. Two
And No. By comparison with 3, it was found that the addition amount of the microbial agent was better when 2% by weight was added rather than 1% by weight.

Next, in order to confirm that the above-mentioned decomposition of oils and fats was not due to the action of aerobic bacteria alone, experiments were conducted to determine whether or not a surfactant was required. In this experiment, waste oil discharged from an actual restaurant was used, and the oil decomposition rate was measured under the same conditions with and without the use of a surfactant. Restaurants are store A (ramen store) and store B (fast food store)
0.2 g of each waste oil discharged from each was collected, and 0.2 ml of the above-mentioned waste oil was added to 0.2 ml of the above-mentioned waste oil, and water was added to make a total of 200 ml. , 0.03g on the side where the surfactant is added
Surfactant was added. The above mixed solution was subjected to shaking tow culture for 6 hours in an environment of 25 ° C. The results are shown in Table 5.

[0033]

[Table 5]

As is clear from the results shown in Table 5, the activity of aerobic bacteria was more active when a surfactant was added,
It has a great effect on the decomposition of oil. This does not mean that the surfactant decomposes the oil and does not directly affect the aerobic bacterium.The surfactant emulsifies the oil, and It is thought that this is because the bacteria can easily reach the oil. In order to confirm this, add water to 0.2 g of the waste oil of store B similar to the above to make the whole 200 ml,
To this, 0.2 ml of the microbial agent was added to one side, and 2 ml of the microbial agent was added to the other side, and the same experiment as above was performed. The results are shown in Table 6.

[0035]

[Table 6]

As is clear from the above experimental results, it is an oil that can be sufficiently decomposed by adding a 10-fold concentration of a microbial agent without using a surfactant, but as described above,
When a surfactant is added, it can be sufficiently decomposed even when a microbial agent having a concentration of 1/10 is used.

As described above, in order to decompose the wastewater containing organic matter, especially the wastewater of a ramen shop or a fast food shop which contains a large amount of fats and oils, emulsification of the fats and oils with a surfactant is carried out by aerobic bacteria. Decomposition is promoted, which makes it possible to decompose organic wastewater.

Next, the second embodiment will be described. In this example, a pH adjuster was added to the first example. As described above, when the pH value when the surfactant is added to the organic waste water is low, the oils and fats may not be dispersed, and the progress of emulsification by the surfactant may be slow. That is, if a long period of time is used to emulsify oils and fats and the like, and if it is decomposed by aerobic bacteria, it will not cause a big problem, but if the wastewater in a restaurant is decomposed, it will be drained within the closing time. Is required to be decomposed, and under such circumstances, it is necessary to promote emulsification. This is because when the organic wastewater continuously flows into the grease trap, the emulsified oils and fats are mixed with the non-emulsified oils and fats, so that the whole emulsification is inhibited and the decomposition by aerobic bacteria is delayed. This is because it will happen.

Therefore, in order to decompose the wastewater in the grease trap within the closing time of the restaurant, it is preferable to increase the pH value, but for various aerobic bacteria,
The highest pH value that can maintain its activity was tested. The experiment was carried out by a method of gradually administering a pH adjuster from a low pH value state to raise the pH value and measuring the change in the viable cell count during that period. As a result of the above experiment, the aerobic bacteria remained alive up to pH 8, but the viable cell count was drastically reduced when the pH exceeded 8. Therefore, it was found that the preferable pH value is 8. Considering the situation of separation of oils and fats, etc., even if the pH value is 7, the microorganisms will be active.
As for the effect of decomposition, it is preferable to adjust the pH to 7 or more and 8 or less.

Next, a third embodiment will be described. In this example, a chelating agent was added to the second example. As described above, L-glutamic acid diacetic acid was used in this example because of the necessity of using a chelating agent having good biodegradability, and the degree of decomposition of organic waste water was tested.
The experiment method is used in store C (ramen store) 2
In the 00l grease trap, the residual state of oils and fats and the like in the grease trap was confirmed between the case where the treatment agent containing the chelating agent was used and the case where the treatment agent containing no chelating agent was used.

It should be noted that the above-mentioned treating agent contains 1% by weight of a microbial agent.
And a solution containing 30% by weight of a surfactant was adjusted to have a pH value of 8. Also, 160 ml for 200 l of organic wastewater stored in the grease trap
Was added and the observation was performed while actually operating the stirrer.

The results of the above experiment are shown in Table 7.

[0043]

[Table 7]

From the above results, it was found that the effect of the decomposition treatment can be improved by using the chelating agent under the conditions such as the organic waste water discharged from the store C. In addition, as shown in Table 5, in the experiment results of the other stores A, the decomposition rate was good even when the chelating agent was not added. Therefore, the above experiment was performed on the waste oil of the store C.

Next, whether or not the defoaming agent is used will be described. As described above, a surfactant is used to emulsify oils and other organic substances, but by stirring inside the grease trap while using the surfactant,
As in the case of using a detergent, bubbles are generated, and while the oils and fats are enclosed in the bubbles, they adhere to the side surface of the container such as the grease trap and remain. The following experiment was conducted to verify this.

The test method was as follows: the treatment agent 16 was added to the grease trap containing 200 liters used in the above-mentioned store C.
In both cases where 0 ml was added and where 0 ml was not added, the organic substances were treated with stirring and the state after 1 hour was observed. As the treating agent, the pH value of the aqueous solution containing 1% by weight of the microbial agent and 30% by weight of the surfactant was 8%.
It has been adjusted to. The results of the above experiment are shown in Table 8.

Regarding the waste oil of store C, the decomposition rate was shown to be good in the experimental results when the chelating agent was used (see Table 7), but this is because it showed only the status of drainage. It does not take into consideration the generation of bubbles in the grease trap and the adhesion of oils and fats to the side wall.

[0048]

[Table 8]

Based on the above experimental results, microbial agents,
It is thought that organic wastewater discharged from various restaurants can be sufficiently decomposed by using surfactants, chelating agents and defoaming agents and adjusting the total pH value to 8 To be Therefore, in order to confirm the decomposition treatment state of the organic waste water in the grease trap of another restaurant, a decomposition treatment experiment was conducted in the store D (ramen store). The experiment is conducted in the grease trap actually used by the store D. In the decomposition treatment, after approximating an actual situation where organic wastewater was treated daily, after closing the store, stirring was continued for 7.5 hours in a state where the wastewater was stopped, and the normal hexane extract substance content was measured thereafter. The results of the above experiment are shown in Table 9.

[0050]

[Table 9]

As can be seen from the above experimental results, the content of the normal hexane extractable substance was reduced to 15% or less, and the decomposition treatment was possible even in a situation where the substance floating in the grease trap could not be visually observed.

As described above, when a treating agent containing a microbial agent, a surfactant, a chelating agent, and a defoaming agent, and having the pH value of the whole of these agents adjusted to 8, is used, the organic waste water can be decomposed. . Therefore, the composition of the treating agent used in the above experiment will be examined.

In the processing experiment at the above-mentioned store D, No. of the processing composition example showing a high effect in Table 4 is shown. In addition to the microbial agents and surfactants shown in 3, chelating agents of 1% by weight and p
It is the one to which 0.1% by weight of the H modifier is added. Therefore,
An experiment was conducted to see whether the treating agent having the above composition can be decomposed even in other restaurants and whether the same effect can be obtained when other aerobic bacteria are used.

As an experimental method, the treating agent of each composition was 0.0
To 8 ml, add 0.2 g of waste oil discharged from store C,
Further, water was added to make the whole 200 ml, and this was cultured with shaking tow for 6 hours, and then the oil decomposition rate and the viable cell count of aerobic bacteria were measured. The results of the experiment are shown in Table 10.

[0055]

[Table 10]

From the above results, it was found that the decomposition treating agent having the composition which was successful in the store D has the same effect in the drainage in the store C. Further, when other aerobic bacteria were used, the same effect could be obtained under the condition that the surfactant, the chelating agent and the pH adjusting agent had the same composition.

Table 10 also shows the results of an experiment conducted with a decomposition treatment agent having a composition which does not use a pH adjusting agent (treatment composition example No. 4). The purpose is to obtain clear results on the preservability of viable bacteria and to make a final confirmation, which was made clear by comparison with decomposition treatment agents having other compositions.

As described above, it was found that the organic wastewater can be decomposed in the examples of the decomposition treatment agent according to the present invention. Therefore, a method for treating wastewater in a container such as a grease trap using the above decomposition treatment agent will be described.

When the decomposition treatment agents described in the above examples are used, the stirring device 2 shown in FIG. 1 is used to stir the organic waste water. When decomposing wastewater, organic substances such as oils and fats generally account for 0.
Since it is less than 1%, it is sufficient to administer 0.01% or more of the decomposition treatment agent to the entire wastewater stored in the grease trap in order to treat the organic wastewater at this concentration. This is premised on that the restaurant completes the decomposition process within 6 to 12 hours, which is the closing time. Therefore, during the opening hours of the restaurant, the organic wastewater that flows into the grease trap is not treated, but the oils and fats in the organic wastewater are simply floated up and separated from the general wastewater, and only the general wastewater is removed. While draining from the strap, it keeps floating oils and fats.

As described above, when the inflow of organic wastewater is allowed while maintaining the state in which oils and fats are retained and the inflow of organic wastewater is stopped by closing the store, the decomposition treatment agent With administration, the stirring device is operated to emulsify the oils and fats and the like floating in the grease trap and to start decomposition by aerobic bacteria.

As described above, since the organic drainage from the store is stopped, even if the fats and oils are dispersed throughout the grease trap due to the emulsification of the fats and oils, the grease traps are discharged to the general drainage channel. Since it does not happen, waste water containing oils and fats will not be discharged to the outside. In addition, since the organic wastewater does not continuously flow in, the non-emulsified organic wastewater is not mixed with the emulsified organic wastewater, and the activity of the aerobic bacteria is stabilized.

As described above, the embodiments and examples of the present invention have been shown, but it is possible to change the modes within the scope of the gist of the present invention. For example, in addition to those listed as aerobic bacteria, it is possible to use convenient aerobic bacteria if they exist. Further, the surfactant, the pH adjuster, the chelating agent or the defoaming agent constituting the decomposition treatment agent is not limited to the agents and the like shown in the examples as long as the same effect can be obtained. Absent.

[0063]

[Effect] As described above, when the decomposition treatment agent according to the present invention is used, organic wastewater containing organic substances such as oils and fats is preferably decomposed by aerobic bacteria while being emulsified. The decomposition treatment by aerial bacteria can be efficiently performed.

Further, according to the decomposition treatment method of the present invention, it is possible to sufficiently decompose the organic wastewater even during a short time when the restaurant is closed. Moreover, since the oils and fats and the like can be sufficiently emulsified by stirring in the grease trap, the oils and fats and the like are not accumulated in the grease trap and the work for removing them can be made unnecessary.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a grease trap and a stirrer used when using a decomposition treatment agent according to the present invention.

[Explanation of symbols]

1 Green strap 2 Processing device body 10 organic wastewater 11,13 Drainage to general drainage 12 Shield 21 base 22 Submersible pump 23 Suction path 24 discharge path 25 suction port 26,27 jet

Claims (12)

[Claims] 1. A decomposition treatment agent for organic wastewater containing aerobic bacteria and a surfactant. 2. The decomposition treatment agent for organic wastewater according to claim 1, which contains a pH adjuster. 3. The method according to claim 1, further comprising a chelating agent.
Decomposition treatment agent for organic wastewater described. 4. The decomposition treatment agent for organic waste water according to claim 1, further comprising an antifoaming agent. 5. The decomposition treatment agent for organic wastewater according to claim 1, which is composed of an aqueous solution containing the following composition. (A) Microbial agent containing 10 ⁶ to 10 ¹² microorganisms / g 1 to 10% by weight (b) Surfactant 1 to 40% by weight 6. The decomposition treatment agent for organic wastewater according to claim 2, which is composed of an aqueous solution containing the following composition. (A) Microbial agent containing 10 ⁶ to 10 ¹² microorganisms / g 1 to 10% by weight (b) Surfactant 1 to 40% by weight (c) pH adjuster 0.01 to 10% by weight 7. The decomposition treatment agent for organic wastewater according to claim 3, which is composed of an aqueous solution containing the following composition. (A) Microbial agent containing 10 ⁶ to 10 ¹² microorganisms / g 1 to 10% by weight (b) Surfactant 1 to 40% by weight (c) pH adjuster 0.01 to 10% by weight (d) Chelate Agent 0.01 to 10% by weight 8. The decomposition treatment agent for organic wastewater according to claim 4, which is composed of an aqueous solution containing the following composition. (A) Microbial agent containing 10 ⁶ to 10 ¹² microorganisms / g 1 to 10% by weight (b) Surfactant 1 to 40% by weight (c) pH adjuster 0.01 to 10% by weight (d) Chelate Agent 0.01 to 10% by weight (e) Defoaming agent 0.01 to 10% by weight 9. The decomposition treatment agent for organic wastewater according to claim 5, wherein 0.01 to 1% by weight of a fungicide is added. 10. A method for decomposing organic wastewater using the decomposition treatment agent for organic wastewater according to any one of claims 1 to 9, wherein the organic wastewater containing less than 0.1% of organic matter is used. A method for treating organic wastewater, which comprises adding 0.01% or more of a decomposition treatment agent. 11. A method for decomposing organic wastewater using the decomposition treatment agent for organic wastewater according to claim 1, wherein the organic wastewater containing less than 0.1% of organic substances is used. A method for treating organic wastewater, which comprises adding 0.01% or more of a decomposition treatment agent and appropriately stirring the above organic wastewater. 12. A method for decomposing organic wastewater using the decomposition treatment agent for organic wastewater according to claim 1, wherein the organic wastewater containing less than 0.1% of organic matter is used. A method for treating organic wastewater, which comprises adding 0.01% or more of a decomposition treatment agent and stirring the organic wastewater continuously for 6 to 12 hours.