JP2594498B2 - High-concentration organic matter treatment method - Google Patents

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 in high-concentration organic wastewater by fermentation and digestion with microorganisms adhering to a carrier.

[0002]

2. Description of the Related Art At present, as a method for treating high-concentration organic wastewater and organic solids, these organic substances are mixed with a microbial carrier made of wood chips (sawdust) or activated carbon and fermented and digested. .

According to this method, an organic substance mixed with a carrier is fermented and digested by microorganisms carried on the carrier, decomposed into carbon dioxide, water, inorganic salts, ammonia and the like, and discharged as drain.

At this time, since the wood fragments are also organic substances, a part thereof is decomposed by fermentation and digestion, and lignin, which is a phenolic polymer in the wood, is discharged into the drain. Phenols are emission control substances, and lignin causes root rot of plants. Therefore, drainage cannot be released without secondary treatment of drainage. Further, since fermentation odor is generated during the fermentation treatment, a large deodorization tank is required depending on the place where the treatment device is installed.

[0005] Activated carbon can be used as a carrier because of its adsorption function. However, it is necessary to remove the adsorbed organic substances to regenerate the adsorbing ability. Needed. Further, activated carbon is liable to clump when mixed with an organic substance, and becomes clumpy, impairs air permeability, inhibits the activity of aerobic bacteria, and requires a high-power motor for the stirrer.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a fermentation digestion treatment of high-concentration organic matter, comprising: a. Prevent the emission of lignin, a phenolic polymer b. B. Promote the activity of aerobic bacteria by ensuring air permeability, and improve treatment capacity. The purpose is to reduce the stirring power.

[0007]

To achieve the above object, according to the Invention The high concentration organic matter treatment process of the present invention, the organic substance, microorganism
While stirring the mixture with the material carrier, air is added to the mixture.
Organic matter by continuous supply and high temperature, aerobic fermentation
The method for treating a high-concentration organic substance for decomposing
Specially processed white sand, a type of volcanic ash,
It is characterized in that it is used as it is without being used .

[0008]

[Function] The organic matter mixed with white sand is stirred and mixed, and the air required for fermentation is provided through a vent, and fermented and digested under high temperature and aerobic conditions. Since the carrier, white sand, is not decomposed by fermentation and digestion, it does not emit compost or excess sludge,
Highly concentrated organic matter is efficiently digested.

[0009] Further, white sand is hard to clump even when mixed with organic matter, and does not impair the air permeability. As a result, the activity of the aerobic bacteria becomes active, and the organic matter treatment capacity is improved.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example of the method for treating a high-concentration organic substance according to the present invention will be described below in detail with reference to FIG. FIG. 1 shows a specific example of an apparatus used in the method of the present invention. In the figure, reference numeral 1 denotes a fermenter, and 3 denotes white sand as a carrier for supporting microorganisms (for example, in the vicinity of Osumi, Satsuma Peninsula, and Miyakonojo). 4 is a stirrer for mixing organic wastewater and white sand 3, 5 is a blower for continuously supplying air into the fermenter 1, 9
Is an inflow pipe for supplying organic wastewater into the fermenter.

The fermenter 1 is surrounded by a heat insulating material 2. At the lower part of the tank, there is provided a filter layer 6 made of cracked stone 6a, gravel 6b, etc. for separating water generated during the treatment. 1
Is provided with a drain port 7 for discharging filtered water.

The stirring device 4 for mixing the organic wastewater supplied from the inflow pipe 9 and the white sand 3 filled in the fermenter 1 is rotated by a motor M provided on the upper part of the fermenter 1. It has become.

A blower 5 for continuously supplying air from the outside is connected to a vent 5a opened on the side of the filtration layer 6 at the lower part of the fermenter 1, and the upper part of the fermenter 1 is formed by fermentation. A deodorizer 8 is provided for treating odors.

Next, a procedure for subjecting high-concentration organic matter to high-temperature aerobic treatment by the fermentation digester constructed as described above will be described. After the white sand 3 is filled in the fermenter 1, high-concentration organic wastewater is supplied to the white sand 3 from the outside through the inflow pipe 9 (when the organic matter is solid, the organic sand is supplied into the fermenter 1 by a conveyor or the like). The supply of the organic wastewater is performed intermittently at intervals calculated based on the treatment time required for fermentation and digestion by contact with microorganisms.

Subsequently, the mixture of the white sand 3 and the organic waste water is stirred by the stirrer 4 so that the aerobic microorganisms can be uniformly propagated, and the blower 5 can be used to blow the mixture of 50 to 400 liter / min.m ³ through the vent 5a. Is continuously supplied into the fermenter 1 to promote aerobic fermentation.

By supplying sufficient air from the blower 5 and keeping the heat in the heat insulating material 2, the fermenter 1 is maintained in an appropriate oxygen and temperature condition, and a high-temperature, aerobic fermentation occurs, and this fermentation is promoted. Digest and decompose organic matter. At this time, the water content of the organic matter is adjusted so that the water content of the carrier is less than 80%. If the water content exceeds this, the fermentation conditions are disrupted and the fermentation stops.

Excess water in the organic matter is absorbed and retained in the white sand 3, and aerobic microorganisms are actively activated.
Generates a high temperature of 0 ° C. When the organic matter is decomposed, water is generated. However, since the temperature in the fermenter becomes high due to the fermentation, the water is vaporized and evaporated, and a small amount of water is removed from the filtration layer 6.
Through the drain port 7 to the outside of the tank. In addition, when the diameter of the fermenter exceeds 5 to 6 m, the surface area per processing capacity becomes small, so that it is not necessary to provide the heat insulating material 2.

Table 1 shows experimental data showing the results of fermentation and digestion of residual rice as an organic substance when wood chips, activated carbon and white sand are used as carriers.

[0019]

[Table 1] From this data, it was found that when white sand was used as the carrier, the processing capacity was about 1.6 times that of the wood chips and about 1.7 times that of the activated carbon.

[0020]

According to the method of the present invention, the following effects can be obtained.

Regarding the fermentation digestion treatment of a high concentration of organic matter, a. Since lignin, which is a phenolic polymer, is prevented from being discharged into the drain, there is no need for secondary treatment of the drain, and the device is unnecessary. b. Even if mixed with organic matter, it is hard to clump, so that air permeability is ensured, and the activity of aerobic bacteria is promoted, and as a result, processing capacity is improved. C. As described above, since it is hard to clump, the stirring power is reduced, and the processing can be performed at low cost.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a fermenter used in the method of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fermenter 2 Insulation material 3 White sand 4 Stirrer 5 Blower 6 Filtration layer 7 Drain port 8 Deodorizer 9 Inflow pipe

Claims (1)

(57) [Claims] 1. A mixture of an organic substance and a carrier of a microorganism is stirred.
While continuously supplying air to this mixture, high temperature, aerobic
High-concentration organic matter treatment that decomposes organic matter by fermentation
In the method, the carrier of the microorganism is a kind of volcanic ash.
White sand without any special processing
High concentration organic matter treatment how.