JP2952738B2 - 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, etc., 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.

[0005] Further, since fermentation odor is generated during the fermentation treatment, a large deodorization tank is required depending on the place where the treatment apparatus is installed.

[0006] Activated carbon can be used as a carrier because of its adsorption function. However, it is necessary to remove 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.

[0007]

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. Reduce stirring power d. The purpose is to digest coffee liquid extraction residue from coffee beans.

[0008]

In order to achieve the above object, the present invention provides a method for treating a high-concentration organic substance, comprising the steps of: extracting coffee liquid residue of coffee beans into a fermenter having a vent and a stirrer; Filling, supplying organic matter therein, continuously supplying air from the vent while mixing the organic matter and the carrier with the stirring device, and decomposing the organic matter by high-temperature, aerobic fermentation. .

[0009]

The organic matter mixed with the extraction residue of the coffee liquor and agitated and mixed is provided with air required for fermentation through a vent, and is fermented and digested under high temperature and aerobic conditions. The extraction residue of coffee liquid of coffee beans as a carrier is also partially digested by fermentation digestion, and the extraction residue after the digestion treatment is almost inorganic.

[0010] Further, even if the extraction residue of the coffee liquor is mixed with an organic substance, it is hard to clump and the air permeability is not impaired. As a result, the activity of the aerobic bacteria becomes active, and the organic matter treatment capacity is improved.

[0011]

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 fermentation tank, 3 denotes a coffee liquid extraction residue of coffee beans which is a carrier for supporting microorganisms, and 4 denotes an organic wastewater. Is a stirrer for mixing the liquid and the coffee liquid extraction residue 3, a blower 5 for continuously supplying air into the fermenter 1, and an inflow pipe 9 for supplying organic wastewater into the fermenter.

The fermenter 1 is surrounded by a heat insulating material 2, and a filter layer 6 made of cracked stone 6a, gravel 6b or the like is provided at a lower portion of the tank to separate water generated during the treatment. 1
Is provided with a drain port 7 for discharging filtered water.

A stirrer 4 for mixing the organic wastewater supplied from the inflow pipe 9 and the coffee liquid extraction residue 3 filled in the fermenter 1 is rotated by a motor M provided on the upper part of the fermenter 1. It is made to be made.

A blower 5 for continuously supplying air from the outside is connected to a vent 5a opened in the lower part of the fermenter 1 on the side of the filtration layer 6, 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 filling the fermenter 1 with the coffee liquid extraction residue 3,
High-concentration organic wastewater is supplied to the extraction residue 3 from the outside through an inflow pipe 9 (if the organic matter is solid, it 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 coffee liquor extraction residue 3 and the organic wastewater is stirred by the stirrer 4 so that the aerobic microorganisms can be propagated uniformly, and the blower 5 allows the mixture to flow through the vent 5a at 50 to 400 l / min. -Continuous supply of m ³ air 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, moderate oxygen and temperature conditions are maintained in the fermenter 1 and 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.

The excess water in the organic matter is absorbed and retained in the coffee liquor extraction residue 3, and the aerobic microorganisms are actively activated.
A high temperature of 50 to 70 ° C. is generated in the tank. When the organic matter is decomposed, water is generated. However, since the temperature in the fermenter becomes high due to the fermentation, this water becomes vapor and evaporates, and a small amount of water is discharged from the drain port 7 through the filtration layer 6 to the outside of the tank. Is done.

In the fermentation digestion treatment, a part of the coffee liquid extraction residue of the coffee beans as a carrier is also digested, so it is necessary to supplement the extraction residue with the digestion treatment. Since the digestion rate of the coffee liquid extraction residue is slower than that of the organic substance as the substance to be treated, about 150 kg of the extraction residue is supplemented to 250 kg of the organic substance to be treated.

When the diameter of the fermenter exceeds 5 to 6 m, the heat insulating material 2 does not need to be provided because the surface area per processing capacity becomes small.

Table 1 shows experimental data showing the results of fermentation and digestion of organic residue as a carrier when wood chips, activated carbon, and coffee liquid extraction residue of coffee beans are used as a carrier.

[0022]

[Table 1] From this data, it was found that when the coffee liquid extraction residue of coffee beans was used as the carrier, the processing capacity was about 3.9 times that of wood chips and about 4.2 times that of activated carbon. did.

[0023]

According to the method of the present invention, the following effects can be obtained. Regarding fermentation digestion treatment of high-concentration 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 no equipment is required. B. B. Since it is hard to clump even when mixed with organic matter, air permeability is ensured, the activity of aerobic bacteria is promoted, and as a result, the processing capacity is improved. As described above, since it is difficult to agglomerate, the stirring power is reduced and it can be processed at low cost.Also, at present, the coffee liquid extraction residue of coffee beans is treated as industrial waste. The coffee extract residue is also partially digested, and most of the carrier after the treatment becomes inorganic, so that it can be diverted as a soil conditioner.

[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 Coffee liquid extraction residue 4 Stirrer 5 Blower 6 Filtration layer 7 Drain port 8 Deodorizer 9 Inflow pipe

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) C02F 3/08 C02F 3/10

Claims (1)

(57) [Claims] 1. A fermenter having a vent and a stirrer is filled with a coffee liquid extract residue of coffee beans as a carrier for microorganisms, and an organic substance is supplied into the fermenter, and the organic substance and the carrier are mixed by the stirrer. A high-concentration organic matter treatment method, characterized in that air is continuously supplied from the ventilation port and organic matter is decomposed by high-temperature, aerobic fermentation.