JPH08217585A - Method for composting bean-curd refuse - Google Patents

Abstract

PURPOSE: To compost a bean-curd refuse without developing nalodor and to effectively reutilize the refuse. CONSTITUTION: A moisture absorbent and a microorganism producing lactic acid, not producing butyric acid, not having a pathogen and having an antioxidant action are added to a bean-curd refuse and stored in a closed and air-free condition. Plural genuses and kinds of microroganisms selected from the group consisting of actinomycetes, hyphomycetes and yeast are preferably used as the microorganism. A dried vegetable fiber is preferably used as the moisture absorbent, and especially the crushed material of a dried coconut shell is preferably used.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of composting okara by treating okara with microorganisms.

[0002]

Okara is a soybean meal residue produced as a by-product in the process of producing tofu. Although a part of this okara was also used for food, there was no other effective use, and most of it was disposed of as industrial waste.

[0003]

However, since the water content of okara exceeds 80% and the protein content of the okara is close to 5%, it easily rots, and when the okara rots, a very strong malodor is generated. Therefore, conventionally, there is a problem in that it is necessary to request a specialized waste treatment company to dispose of the waste, and even if the disposal is performed, a large cost is required.

On the other hand, Japanese Patent Application Laid-Open No. 5-170579 discloses a method for producing an organic fertilizer using microorganisms. According to this, organic waste can be converted into organic fertilizer. Therefore, if you treat okara with this method, you can dispose of it with less expense than before.
Moreover, it was considered possible to obtain useful organic fertilizers.

However, since okara is very easily decomposed as compared with ordinary garbage and has a strong bad odor when it is decomposed, even if the okara is treated by the method disclosed in the above publication, it will be Okara gave off a bad odor, and there was a problem in using it as fertilizer.

Therefore, an object of the present invention is to compost okara without producing a bad odor and to effectively reuse it.

[0007]

Means and Actions for Solving the Problems In order to achieve the above object, the method for composting tofu according to the present invention comprises, as described in claim 1, a moisture absorbent and lactic acid to produce butyric acid. The microorganism is characterized in that it is stored in a closed and non-aerated state by adding to Okara and a microorganism which has no pathogenicity and has an antioxidant effect.

In the present invention, the water absorbent absorbs the water contained in the okara, and is added to promote fermentation of the okara and suppress spoilage. The amount of water absorbent added cannot be generally stated because it depends on the water content of the okara and the water absorption capacity of the water absorbent, but in any case, the soybeans immediately after squeezing the soybeans contain a large amount of water. Therefore, the water content of the okara is reduced by adding a water absorbing material here. Here, if the water content of the okara is not sufficiently reduced, the rotten odor may be generated from the composted okara. It is not clear what causes the rotten odor when there is a lot of water in the okara, but when composting in the presence of excess water, the balance of microorganisms is disturbed and the number of spoilage-type microorganisms increases. The protein components of the
It seems that a strong odor is generated.

The microorganism used in the present invention is not particularly limited as long as it produces lactic acid, does not produce butyric acid, has no pathogenicity, and has an antioxidant action. , Said microorganisms are actinomycetes, photosynthetic bacteria, lactic acid bacteria,
Desirably, it is a microorganism of multiple species and plural species selected from the group consisting of filamentous fungi and yeasts.

Examples of such microorganisms include those belonging to actinomycetes, such as Strepto-mycess p. (ATCC 30
04), Streptoverticillium sp. (ATCC 23654), Nocard
ia sp. (ATCC 19247), Micromonospora sp. (ATCC 1245)
2), Rhodococcus sp .; As those belonging to photosynthetic bacteria, for example, Rhodopseudomonas sp. (R. sphaeroides),
Rhodospirillum sp. (R.fulum), Chromatium sp. (C.oke
nii), Chlorobium sp. (C. limicola); as belonging to lactic acid bacteria (lactic acid-producing bacteria), for example, Lactobacillus sp.
FO 3070), Propionibacterium sp. (P. freudenreichi
i), Pediococcus sp. (P. halophilus), Streptococcus
sp. (S. lactis, S. faecalis); as those belonging to filamentous fungi, for example, Aspergillus sp. (RIFY 5770, RIFY 502
4), Mucor sp. (IFO 8567); as belonging to yeast, for example, Saccharomyces sp. (NRRL 1346, Y 977),
Candida sp. (C. utilis) can be mentioned.

Photosynthetic bacteria have the action of decomposing ammonia, hydrogen sulfide, mercaptans and various hydrocarbons generated in wastes to eliminate malodorous sources and at the same time promoting the production of various effective amino acids such as proline and methionine. Have. The lactic acid bacterium has a function of preventing spoilage of waste.
Further, when actinomycetes and yeasts are used, microbial flora of Gram-positive bacteria that suppress the action of harmful microorganisms are formed. Therefore, it is particularly desirable to use the above microorganisms in combination of a plurality of species and a plurality of species.

Although various types of water absorbing materials that simply absorb water are conceivable, considering use as compost, the water absorbing material is dried plant fiber as described in claim 3. Good. Examples of such vegetable fibers include cotton, hemp, straw, pulp, sawdust, and the like. Particularly, as described in claim 4, the vegetable fiber is a crushed product of dried palms. good.

[0013] Such dried plant fibers act as a water absorbent, and when used as compost, the plant fibers are easily decomposed in soil to pollute the environment. There is nothing to do. In particular, a dried crushed coconut husk is desirable because it has a large water absorption capacity per unit weight and a large water absorption effect can be exhibited with a small addition amount.

As the water absorbing material which does not pollute the environment, pumice stone, charcoal powder, etc. can be used in addition to the vegetable fiber. Okara composted by the above-mentioned method does not generate a bad odor unlike conventional okara, and thus can be easily disposed of by cost-saving methods such as burying it in soil. In addition, since a large amount of nitrogen is contained as a result of the decomposition of the protein component of okara, it can be used as a useful fertilizer.

[0015]

Embodiments of the present invention will be described below. (1) Composting method 1 2.0 kg of crushed coconut powder dried to 10 kg
In addition, Streptomyc
es sp. (ATCC 3004), Streptoverticillium sp. (ATCC
23654), Nocardia sp. (ATCC 19247), Micromonospora
sp. (ATCC 12452) ； As belonging to photosynthetic bacteria,
Rhodopseudomonas sp. (R. sphaeroides), Rhodospirillu
m sp. (R.fulum), Chromatium sp. (C.okenii); As belonging to lactic acid bacteria, for example, Lactobacillus sp.
O 3070), Propionibacterium sp. (P. freudenreichi
i), Pediococcus sp. (P. halophilus), Streptococcus
sp. (S. lactis, S. faecalis); and as belonging to yeast, Saccharomyces sp. (NRRL1346, Y 977), Can
The microorganisms such as dida sp. (2) Composting method 2 As a comparative example, 10 kg of okara was composted by the same method as above without adding ground crushed material. (3) Odor test Regarding the okara composted by the methods of (1) and (2) above, the presence or absence of an odor was confirmed. The confirmation results are shown in Table 1.

[0016]

[Table 1]

As is clear from Table 1, it was possible to obtain a compost having no bad odor from the okara to which the crushed coconut powder was added. On the other hand, when Okara is composted alone,
A bad odor was generated, which was not preferable for use as compost. (4) Cultivation test Cucumber was cultivated by feeding the composted okara by the method of (1) above. As a comparative example, cucumber was cultivated without giving composted okara. The results are shown in Table 2.

[0018]

[Table 2]

As is clear from Table 2, approximately twice as many cucumbers as those without okara could be harvested from the composted okara-free strain. Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modes can be adopted without departing from the scope of the present invention.

[0020]

As described above, according to the present invention, okara
Since the compost is produced without producing a bad odor, the cost conventionally required for the disposal of the okara can be significantly reduced, and the okara can be effectively reused as the compost.

In particular, according to the composting method of the third aspect, since the water absorbing material is decomposed in the soil, the use of the composted okara as a fertilizer does not cause environmental pollution. Further, according to the composting method of claim 4, since it is highly effective as a water absorbing material and a small addition amount is required,
The cost advantage is great.

Claims (4)

[Claims] 1. A moisture absorbent and a microorganism that produces lactic acid, does not produce butyric acid, has no pathogenicity, and has an antioxidant action, are added to okara, and are stored in a closed and non-aerated state. To compost from Okara. 2. The method of composting according to claim 1, wherein the microorganisms are actinomycetes, photosynthetic bacteria, lactic acid bacteria, filamentous fungi,
And a method of composting from okara, which is a microorganism of a plurality of genera selected from the group consisting of yeast and yeast. 3. The method of composting okara according to claim 1 or 2, wherein the water absorbing material is dried plant fiber. 4. The method of composting okara according to claim 3, wherein the vegetable fiber is a crushed product of dried coconut husks.