JPH11278970A - Composting of fish intestine-containing garbage - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for treating the subject garbage to obtain a high-quality compost of low crude fat content by continuously charging a fermentation tank with a fish intestine-contg. garbage and submaterials in specified proportions to perform an aerobic fermentation with no need of exchanging the fermentation mass in the tank over a long period. SOLUTION: A fermentation tank is continuously charged with 100 pts.wt. of garbage comprising pref. >=50 wt.% of fish intestine and other organic matter decomposable through the aerobic fermentation by microorganisms such as common garbage, various lees, sludge and fish meat and 5-20 pts.wt. of submaterials including wood-based submaterials such as bark, sawdust, chaffs, organic submaterials such as rice bran and other kinds of bran and other submaterials such as compost as the product, to perform an aerobic fermentation, effecting the aimed composting. To promote the aerobic fermentation, the fermentation is pref. carried out under homogeneously mixing agitation in the tank, and it is also recommended to continuously introduce air into the tank. A compost thus obtained by the above fermentation for a given period is characteristic in low fat content, specifically, with a crude fat content of <=20 wt.%.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for composting fish intestine-containing garbage, and more particularly, the present invention relates to a method for continuously composting aerobic fermentation for a long period of time. The present invention relates to a composting method for fish intestine-containing garbage that does not require replacement of fermentation bodies. The present invention also relates to a high-quality compost obtained with this method, which has a low crude fat content.

[0002]

2. Description of the Related Art In a conventional composting method in which fish intestine-containing garbage is continuously fed into a fermentation tank and aerobic fermentation is performed, for example, fish intestine containing Generally, there is a continuous processing method in which kitchen waste is continuously added daily, or a batch processing method in which fish intestine-containing kitchen waste and an auxiliary material having the same weight as this are put into the fermenter every day.

However, in such a continuous processing method, it is necessary to replace all the fermented bodies in the fermenter once every three months to half a year. The reason is that the fat contained in a large amount in fish intestines significantly lowers the decomposition rate of organic substances, and the fermented product becomes clumpy and further fermentation becomes difficult. This phenomenon is particularly remarkable when using highly mixed fish intestine-containing garbage containing fish intestines at 50% by weight or more. In the batch processing method, the size of the fermentation processing apparatus is increased because the auxiliary material is mixed with the raw material for each processing.

[0004] The compost obtained by the conventional method contains a high proportion of fat, which may adversely affect plant growth.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a composting process for garbage containing fish and intestines which does not require replacement of fermentation bodies in a fermenter even if aerobic fermentation is continuously performed for a long period of time. It is to provide a method. Another object of the present invention is to provide a high-quality compost having a low crude fat content.

[0006]

Means for Solving the Problems As a result of intensive studies, the present inventors have found that fish intestine-containing garbage is continuously fed into a fermentation tank and aerobically fermented, and the garbage is continuously composted. In this method, when the garbage is put into a fermentation tank, it has been found that the above problem can be solved by using a specific ratio of auxiliary materials in combination, and the present invention has been completed.

That is, according to the present invention, in a method for continuously feeding fish intestine-containing garbage into a fermenter and aerobically fermenting the garbage to continuously compost the garbage, 5 to 20 parts by weight of the garbage together with the garbage are used. An object of the present invention is to provide a method for composting fish intestine-containing garbage, which comprises adding auxiliary materials (based on 100 parts by weight of the garbage) to the fermenter.
Further, the present invention provides the above-mentioned method for treating kitchen waste containing 50% by weight or more of fish intestines. Further, the present invention provides the above method for performing aerobic fermentation while stirring the contents of the fermenter. Furthermore, the present invention
The present invention provides a compost containing 20% or less of crude fat obtained by the above method.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION The garbage containing fish intestines used in the present invention is garbage including built-in varieties generated in a fish processing step. Can be used. Garbage other than fish intestines is not particularly limited as long as it is an organic substance that can be decomposed by aerobic fermentation of microorganisms, and examples thereof include garbage, various types of lees, sludge, and fish meat.

Particularly, in the present invention, a remarkable effect is exhibited when a highly mixed fish intestine-containing garbage containing 50% by weight or more of fish intestine is used.

[0010] The auxiliary material used in the present invention is not particularly limited, and those used in the prior art can be appropriately selected. For example, wood-based sub-materials such as bark, sawdust, and rice hull; other organic sub-materials such as rice bran and bran; commercialized compost and the like can be mentioned. It is preferable that these auxiliary materials have good air permeability.

According to the present invention, a small amount of auxiliary material is used when aerobically fermenting fish intestines is continuously fed into a fermentation tank for aerobic fermentation.
It has one feature in being put together with fish intestines containing garbage. The input amount of the auxiliary material is preferably 5 to 20 parts by weight based on 100 parts by weight of the fish intestine-containing garbage.

In the present invention, the fermentation method itself can be performed without much difference from the conventional one. For example, an auxiliary material is previously charged in a fermenter of an appropriate capacity (for example, 5 kg of kitchen waste).
Alternatively, only the garbage containing fish intestines is continuously charged in a fermentation tank and left for an appropriate number of days of about 2 months to prepare a preliminary fermentation phase. Then, the fish intestine-containing garbage and the specified small amount of sub-materials are put into it. This input is performed, for example, every day, and when it is determined that composting by aerobic fermentation has been achieved to some extent, the fermented body is removed from the fermenter. The amount of the fermented body to be taken out may be appropriately determined in consideration of the fermentation state and the like. For example, the amount is 0.15 to 0.25 times the weight of the fed fish-intestinal garbage. The fermentation temperature is not particularly limited.
About 0 ° C. is desirable.

[0013] Fermentation promotes aerobic fermentation,
It is desirable to carry out the mixing while stirring and uniformly mixing the contents in the fermenter, and it is preferable to continuously introduce air into the fermenter as in the prior art. In addition, components expected to be insufficient may be added separately.

As the microorganisms used for fermentation, microorganisms originally contained in fish intestinal garbage and auxiliary materials can be used,
In addition, those derived from the atmosphere or the like can be used. In addition, the microorganism which performs aerobic fermentation can also be inoculated as needed.

According to the method of the present invention, composting can be performed semi-permanently by continuously feeding fish intestine-containing garbage without having to replace the fermentation bodies in the fermenter.

The compost obtained by carrying out the method of the present invention after a certain period of time is characterized by a low fat content. For example, the compost of the present invention has a crude fat of 20% or less. Crude protein is also 35 to 45%, and compost having these component contents is useful for plant growth. In addition, the crude fat referred to in the present invention is a value obtained by the Soxhlet extraction method.

[0017]

EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples. In a fermenter with a volume of 100 liters, 13.9 kg of highly mixed fish intestines containing 50% by weight or more of fish intestines
Was added every day for 60 days and stirred at room temperature while introducing air to prepare a preliminary fermentation phase (first stage). After a lapse of 60 days, 13.9 kg of the high-mix fish intestine-containing garbage was put into the fermentation tank together with 1.2 kg of the product compost as an auxiliary material, and at the same time, 1.0 kg of the fermented body was pulled out from the bottom of the fermentation tank. This operation was repeated for 30 days (second period). After 90 days, the amount of the fermented body withdrawn was increased to 3.0 kg, and this operation was continued until after about 150 days (Third phase).

The ratio of crude protein, crude fat, crude fiber and ash to the weight of the solid content of the fermented product in the first to third stages was examined. The result is shown in FIG. According to FIG. 1, the crude fat content starts to decrease remarkably from the third period, and has become 20% or less after 120 days. The crude protein is also constant in the range of 35 to 45% in the third stage. Therefore, it was confirmed that the compost obtained in the third stage is useful for plant growth. In addition, the method of the present invention has a significantly reduced introduction of sub-materials compared to the prior art,
It contributes to cost reduction.

[0019]

According to the present invention, even if aerobic fermentation is carried out continuously for a long period of time, it is not necessary to replace the fermentation body in the fermentation tank, and only a small amount of auxiliary material is used, so that the cost is low. A method for composting certain fish-intestinal garbage is provided. Further, according to the present invention, it is possible to obtain a high-quality compost having a low crude fat content.

[Brief description of the drawings]

FIG. 1 is a graph showing the ratio of crude protein, crude fat, crude fiber, and ash to the weight in the solid content of the fermented product in the first to third stages in Examples of the present invention.

Continued on the front page (72) Inventor Masakazu Yokota 1-6-1, Funakoshi Minami, Aki-ku, Hiroshima-shi, Hiroshima Japan Steel Works Co., Ltd.

Claims (4)

[Claims] 1. A method for continuously feeding fish intestine-containing garbage into a fermentation tank and aerobically fermenting the garbage to continuously compost the garbage, wherein 5 to 20 parts by weight of auxiliary material ( A method for composting fish intestines containing garbage into the fermenter (based on 100 parts by weight of the garbage). 2. The method according to claim 1, wherein kitchen waste containing 50% by weight or more of fish intestines is treated. 3. The method according to claim 1, wherein the aerobic fermentation is performed while stirring the contents of the fermenter. 4. A compost obtained by the method according to claim 1 and containing not more than 20% of crude fat.