JPH0691286A - Method for treating highly concentrated organic material - Google Patents

Abstract

PURPOSE:To control a fermentation odor emitted during the digestive treatment of highly concentrated organic material by preventing the elution of lignin, a phenolic polymer, and using activated carbon or charcoal as a bacteria carrier. CONSTITUTION:A fermentation tank 1 equipped with a vent 5a and a stirrer 4 is filled with active carbon or charcoal as a carrier of bacteria. A mixture of organic material supplied and the carrier in the tank 1 is fed with air continuously from the vent 5a under stirring, so that the organic material is decomposed by fermentation at high temperatures in an aerobic condition.

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 highly-concentrated organic wastewater by fermentation and digestion with microorganisms attached to a carrier.

[0002]

2. Description of the Related Art At present, as a method for treating high-concentration organic wastewater and organic solid matter, the organic matter is mixed with a microbial carrier composed of wood chips (sawdust) and fermented and digested.

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

At this time, since the wood chips are also organic substances, a part thereof is decomposed by the fermentation digestion action, and lignin, which is a phenolic polymer in wood, is discharged into the drain. Phenols are emission control substances, and lignin causes root rot of plants, so drain cannot be discharged without secondary treatment. In addition, since a fermentation odor is generated during the fermentation process, a large deodorizing tank is required depending on the place where the processing device is installed.

Activated carbon or charcoal can be used as a carrier due to its adsorption action, but it is necessary to remove the adsorbed organic matter to regenerate the adsorption capacity. For regeneration, there is a method such as incineration of the adsorbed component at high temperature. Has been taken.

[0006]

DISCLOSURE OF THE INVENTION PROBLEM TO BE SOLVED BY THE INVENTION Regarding fermentation digestion treatment of high-concentration organic matter, Preventing the discharge of lignin, which is a phenolic polymer b. Use activated charcoal or charcoal as a microorganism carrier to regenerate it c. The purpose is to suppress the fermentation odor generated during processing.

[0007]

In order to achieve the above object, the method for treating high-concentration organic matter according to the present invention is a method in which a fermenter equipped with a vent and a stirrer is filled with activated carbon or charcoal as a microbial carrier. The organic substance is decomposed by aerobically fermenting it at a high temperature by continuously supplying air from the vent while mixing the organic substance and the carrier with the stirring device.

[0008]

[Function] The organic matter that is stirred and mixed with activated charcoal or charcoal is provided with air necessary for fermentation through a vent and fermented and digested under high temperature and aerobic conditions. Since activated carbon or charcoal as a carrier is not decomposed by fermentation digestion, high-concentration organic matter can be efficiently digested without producing compost or excess sludge.

Further, during the fermentation treatment, microorganisms propagate in activated carbon or charcoal and decompose organic substances adsorbed on the activated carbon or charcoal, so that the adsorption action is restored and maintained. Further, the deodorizing action of activated carbon or charcoal suppresses the generation of fermentation odor.

[0010]

EXAMPLE A specific example of the method for treating high-concentration organic matter according to the present invention will be described in detail below with reference to FIGS. FIG. 1 shows a specific example of the apparatus used in the method of the present invention. In the figure, reference numeral 1 is a fermenter, 3 is activated carbon as a carrier for supporting microorganisms, and 4 is a mixture of organic waste water and activated carbon 3. A stirring device 5 for supplying air to the fermenter 1 for continuously supplying air,
Reference numeral 9 is an inflow pipe for supplying organic waste water into the fermenter.

The fermenter 1 is surrounded by a heat insulating material 2, and at the lower part of the fermenter 1 is provided a filter layer 6 composed of split stones 6a, gravel 6b, etc. for separating the water generated during the treatment. 1
A drain port 7 for discharging filtered water is provided at the bottom of the.

The stirring device 4 for mixing the organic waste water supplied from the inflow pipe 9 and the activated carbon 3 filled in the fermentation tank 1 is rotated by a motor M provided above the fermentation tank 1. It has become.

A blower 5 for continuously supplying air from the outside is connected to a vent 5a formed in the side of the filtration layer 6 at the bottom of the fermenter 1, and the upper part of the fermenter 1 is generated by fermentation. A deodorizer 8 is provided for treating the odor that is generated.

Next, the procedure for high-temperature aerobic treatment of high-concentration organic matter by the fermentation digester thus constructed will be described. After filling the fermenter 1 with activated carbon 3, the activated carbon 3
High-concentration organic wastewater is supplied from the outside through the inflow pipe 9 (when the organic matter is solid, it is supplied into the fermenter 1 by a conveyor or the like). This organic wastewater is supplied intermittently at intervals calculated based on the treatment time required for fermentation and digestion due to contact with microorganisms.

Subsequently, the mixture of the activated carbon 3 and the organic waste water is stirred by the stirrer 4 so that the aerobic microorganisms are uniformly propagated, and the blower 5 is used to blow 50 to 400 l / min · m ³ through the ventilation port 5a. Air is continuously supplied into the fermenter 1 to promote aerobic fermentation.

By supplying sufficient air from the blower 5 and keeping the heat insulation by the heat insulating material 2, moderate oxygen and temperature conditions are maintained in the fermenter 1, high temperature aerobic fermentation occurs, and this fermentation is promoted. Digests and decomposes 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 is higher than this, the fermentation conditions will collapse and the fermentation will stop.

The excess water in the organic matter is absorbed by the activated carbon 3,
Water is retained, aerobic microorganisms are active, and the inside of the tank is 50 ~
It produces a high temperature of 70 ° C. When organic matter is decomposed, water is generated, but due to the high temperature in the fermentation tank due to fermentation, this water becomes vapor and evaporates, and some water is discharged from the drain port 7 through the filtration tank 6 to the outside of the tank. To be done. When the diameter of the fermenter exceeds 5 to 6 m, the surface area per processing volume becomes small, so that it is not necessary to provide the heat insulating material 2.

Next, the regeneration of the adsorption force of the activated carbon 3 will be described. FIG. 2 is a graph showing the results of fermentative digestion treatment of organic rice leftovers over one month using activated carbon as a carrier.

The vertical axis shows the total weight of the mixture of activated carbon and the leftover rice, and the horizontal axis shows the number of days from the start of the treatment. Even though the amount of leftover rice was cumulatively increased, the total weight of the mixture was Almost no change after a month.
This indicates that the treatment of organic matter is effectively performed, and that the microorganisms that propagate in the activated carbon decompose the organic matter adsorbed on the activated carbon to regenerate the adsorptive power.

Although activated carbon is used as the microorganism carrier in the above-mentioned embodiment, charcoal may be used.

[0021]

EFFECTS OF THE INVENTION Since activated carbon and charcoal used as a carrier do not have lignin components, phenols, which are emission control substances, are not emitted, and discharged without secondary treatment of drain water. You can

Further, the adsorbing action of activated carbon or charcoal as a carrier is regenerated by microorganisms during the fermentation process, so that labor and equipment such as incineration for regeneration are unnecessary, and it is necessary to supplement activated carbon or charcoal. It's economical because it doesn't exist.

Furthermore, since activated carbon and charcoal have a deodorizing action, it is possible to suppress the fermentation odor generated during fermentation, and a small accessory device such as a deodorizing tank is sufficient.

[Brief description of drawings]

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

FIG. 2 is a graph showing the results of an experiment in which activated carbon is used as a carrier to treat leftover food.

[Explanation of symbols]

 1 Fermenter 2 Heat insulation material 3 Activated carbon 4 Stirrer 5 Blower 6 Filtration layer 7 Drain port 8 Deodorizer 9 Inflow pipe

Claims (1)

[Claims] 1. A fermenter equipped with a vent and a stirrer is filled with activated carbon or charcoal as a carrier for microorganisms, and an organic substance is supplied into the fermenter to mix the organic substance and the carrier with the stirrer while the vent is provided. Air is continuously supplied from
A method for treating high-concentration organic matter, which comprises decomposing organic matter by aerobic fermentation.