JPH11137953A - Microorganism deodorization apparatus and method for operating the apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable the exhibition of good ammonia deodorization performance from the initial period of operation by providing the apparatus with water spraying equipment for spraying water to carriers deposited with microorganisms and a water storage tank for recovering the sprayed water and adding liquid media and nitrifying bacteria to the water in the water storage tank before the operation of the apparatus. SOLUTION: An the time of operation of the deodorization device, the nitrifying bacteria 15 previously cultured in the liquid media are added together with the media into the water 6 in the water storage tank 6. Odors are supplied through an odor pipe 2 into a deodorization vessel 1 and the water added with the nitrifying bacteria in the storage tank 6 is sprayed toward the carriers 3 from a water spraying section 10 through a water lifting pipe 8 and a water spraying pipe 9 by a pump 7. The sprayed water partly passes among the carriers 3 and moves from a shelf section 1a to a water receiving section 1b and is circulated by refluxing the same to the storage tank 6 through a return pipe 5. When the odor amt. to the odor pipe 2 is thereafter put into a stationary state, the ammonia component in the odor is surely cracked and the waste gases substantially not containing the ammonia are discharged from a discharge pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a microorganism deodorizing apparatus for deodorizing ammonia gas contained in an odor generated in an organic waste composting plant, a sewage treatment plant, a livestock barn, and the like, and a method of operating the same. It is.

[0002]

2. Description of the Related Art In a conventional microorganism deodorizing method, when starting up a microorganism deodorizing apparatus, an activated sludge solution in a sewage treatment plant is sprayed to flow odor gas, thereby increasing the number of bacteria capable of treating the odor gas. . This is because, for the carrier that carries the microorganisms, inorganic materials such as zeolite, charcoal, slag, ceramics, activated carbon, and PVA gel, or organic materials are used, but bacteria that deodorize adhere to these carriers. Therefore, using activated sludge, etc.,
This is because a period called acclimation, in which the bacteria are added and the bacteria are increased while slowly increasing the odor load, is required. Further, in the above deodorizing device, it is necessary to control the water content in order to prepare an environment for the activity of microorganisms, and a watering device is attached to water the carrier as required. In addition, in this sprinkling, the microorganisms fixed on the carrier are flowed to some extent, so that the water that has been sprinkled and moved in the carrier is collected, stored in a water storage tank, and used again for sprinkling. Then, when the microorganisms work smoothly in the carrier, the odor components passing through the carrier are decomposed by the microorganisms, and a deodorizing effect is obtained.

[0003]

By the way, the odor contains various odor components, and depending on the source of the odor,
The odor contains a large amount of ammonia. But,
Since the growth rate of nitrifying bacteria (mainly ammonia-oxidizing bacteria and nitrite-oxidizing bacteria) that oxidize ammonia is 1/30 to 1/6 as compared with other heterotrophic bacteria, it is difficult to treat ammonia. Before reaching a sufficient bacterial density, the growth of other types of bacteria proceeds early using other odor components in the odor as nutrient sources. As described above, it is essential to spray water on the carrier for deodorization. Therefore, in order to fix microorganisms, it is necessary to adhere to the surface of the carrier. However, since the surface area of the carrier is limited,
As described above, if the growth of other types of bacteria progresses predominantly and is fixed to the carrier surface, then even if nitrifying bacteria grow, a carrier surface to which the bacteria can adhere cannot be obtained, and thus the bacteria are fixed to the carrier. As a result, sufficient ammonia decomposition performance cannot be obtained. Furthermore, if such a state continues for a long time, ammonia in the odorous gas raises the pH of the carrier and becomes an environment outside the growth range of the nitrifying bacteria, thus causing a problem that the activity of the nitrifying bacteria is lost. For the above reasons, it is difficult for conventional deodorizers to remove odorous gas containing high-concentration ammonia by microorganism deodorization.
The present invention has been made in view of the above circumstances,
It is an object of the present invention to provide a microorganism deodorizing apparatus capable of solving the above problem by securing the superiority of nitrifying bacteria at the start of operation and exhibiting good ammonia deodorizing performance from the beginning of operation, and an operation method thereof.

[0004]

Means for Solving the Problems To solve the above problems, a microorganism deodorizing apparatus of the present invention comprises: a carrier for supporting microorganisms;
A sprinkler for sprinkling the carrier and a water storage tank for collecting the sprinkled water are provided, and prior to the operation of the device, the liquid medium in the water in the water storage tank, and preferentially cultured while suppressing the growth of other bacteria. It is characterized by adding nitrifying bacteria.

[0005] A method of operating a microorganism deodorizing apparatus according to a second aspect of the present invention includes a carrier for supporting microorganisms, a watering facility for sprinkling water on the carrier, and a water storage tank for collecting sprinkled water.
In the method for operating a microorganism deodorizing apparatus for deodorizing an odor containing ammonia gas by the microorganism, a nitrifying bacterium that has been cultured in advance is added to a carrier or water spray at least at the time of starting operation. In addition, the third
The method for operating a microorganism deodorizing device according to the invention is characterized in that, in the second invention, the nitrifying bacteria are grown preferentially while suppressing the growth of other bacteria.

[0006] The present invention is directed to an odor containing ammonia as an odor component.
As described above, a composting plant, a sewage treatment plant, and a barn are exemplified. However, the present invention is not limited to these, and any source may be used as long as it generates an odor including ammonia. Further, the concentration of ammonia to be treated is not particularly limited, but in the present invention, ammonia can be reliably decomposed even with an odor containing ammonia having a concentration exceeding 500 ppm. The nitrifying bacteria added after being cultured in advance mainly consist of ammonia oxidizing bacteria and nitrite oxidizing bacteria. The present invention is not particularly limited to bacteria among the above, but it is preferable that ammonia-oxidizing bacteria and nitrite-oxidizing bacteria are mixed in a well-balanced manner.

As described above, inorganic or organic materials such as zeolite, charcoal, slag, ceramics, activated carbon, and PVA gel can be used as the carrier for supporting the microorganisms. The best zeolite is the best. Conventionally, activated sludge was mixed with this carrier, and nitrifying bacteria were acclimated from the mixture.In the present invention, however, in order to secure the superiority of nitrifying bacteria, activated sludge was not used, and nitrifying bacteria previously cultured were used. It is desirable to start operation only with. In a large-scale device, the carrier may be dug in the ground and accommodated in this hole, or may be accommodated in a suitable container. In the carrier accommodating section, a collecting section is provided so as to collect water sprinkled at the bottom. For example, if you have a carrier in the hole in the earth,
A water blocking layer such as a sheet is provided so that water does not penetrate into the ground, and water can be taken from this blocking layer and stored in a water storage tank. The water stored in the water storage tank is supplied to a watering facility by a pump or the like, and water is sprayed from the watering facility to the carrier. The structure of the watering equipment and the watering method are not particularly limited as the present invention.

[0008] Prior to the operation of the deodorizing device, the nitrifying bacteria are cultured with an appropriate medium, environment, and the like defined in advance. In this culture, it is desirable to suppress the growth of other bacteria and preferentially grow nitrifying bacteria. As a result, it is desirable that the number of nitrifying bacteria is 90% or more of the total number including other bacteria. In addition, the concentration of nitrifying bacteria should be 1
0 to present ⁶ cells / ml or more.

The nitrifying bacteria are added to the carrier or water to be sprinkled at least at the start of the operation. However, it is desirable that the nitrifying bacteria be added to the water to be sprinkled and added to the carrier together with the sprinkle so that the bacteria can be uniformly added. . It is essential to add nitrifying bacteria before the start of operation as described above, but it is also possible to add nitrifying bacteria at any time after the operation for the purpose of replenishing nitrifying bacteria. However, the purpose is clearly different from the addition performed before the start of operation as described above. That is, the addition performed before the start-up of the operation is intended to fix the nitrifying bacteria on the carrier preferentially over other bacteria and to occupy the surface of the carrier preferentially with the nitrifying bacteria. Different from replenishment. Thereafter, even when the operation is continued, the state in which the nitrifying bacteria are dominant in the state of being fixed to the carrier is maintained, and the ammonia component of the odor is reliably and efficiently decomposed.

In the early stage of the operation, the odor gas is allowed to flow through the carrier while suppressing the pH rise of the carrier, and the water in the water storage tank is circulated so as to collect the sprinkled water while spraying the water onto the carrier. It is desirable to immobilize the bacteria on the carrier while preferentially growing the bacteria. By this method, the nitrifying bacteria that have been preferentially grown are gradually fixed to the carrier while circulating, so that the nitrifying bacteria can be fixed dominantly and reliably on the surface of the carrier early, and the excellent ammonia decomposition performance can be achieved from the early operation. Is obtained. Therefore, this operation method is not intended to simply increase the nitrifying bacteria as in the conventional practice, but it is important that the nitrifying bacteria dominate the surface of the carrier. In addition, the suppression of the increase in pH can be performed by setting the pH to such an extent that the pH does not rise outside the activity range of the nitrifying bacteria or a predetermined upper limit of the pH. However, in order to secure the activity of the nitrifying bacteria, there is a margin. It is desirable to determine the upper limit of the pH, and for example, 9.0 can be exemplified as the upper limit of the pH. The above conditions can be maintained by controlling the amount of odor blown and the ammonia concentration to be loaded.

That is, according to the present invention, a nitrifying bacterium that has been sufficiently grown in the early stage of operation can be obtained. Among the nitrifying bacteria, the ammonia oxidizing bacteria oxidize ammonia to nitrite, and the nitrite is oxidized by the nitrite oxidizing bacteria into nitrate ions. This nitrate ion is reduced by denitrifying bacteria to become nitrogen and released into the atmosphere, or dissolved in water of sprinkling and carried away, so that even high-concentration ammonia is satisfactorily biochemically decomposed.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the accompanying drawings. The deodorizing tank 1 has a box shape, has a water-permeable shelf 1a at the bottom thereof, and is connected to an odor pipe 2 near the ceiling.
Are connected to an odor source and a blower (not shown). Further, in the deodorizing tank 1, a carrier 3 made of zeolite particles is accommodated so as to be supported by the shelf 1a. Further, below the shelf 1a of the deodorization tank 1, an exhaust pipe 4 is connected, and a water receiver 1b is secured. One end of a return pipe 5 is connected to the water receiver 1b. The other end of the return pipe 5 is connected to a water storage tank 6. A water pump 8 connected to the suction side of the pump 7 is disposed in the water storage tank 6, and a water sprinkling section 10 is connected to the discharge side of the pump 7 via a water sprinkling pipe 9. The water sprinkling section 10 is located above the carrier 3 in the deodorizing tank 1, and includes the pump 7, the water pipe 8, the water sprinkling pipe 9,
The water spraying unit 10 constitutes a water spray facility.

The operation of the deodorizing apparatus described above will be described. Nitrifying bacteria are preferentially cultured in a liquid medium in advance, and the nitrifying bacteria 15 (shown schematically in the figure) are stored in the water storage tank 6. It is added to the water 6a together with the medium. Then, a smaller amount of odor than in the normal state is supplied into the deodorizing tank 1 through the odor pipe 2, and the pump 7 is operated to pump water from the water storage tank 6 together with the nitrifying bacteria 15 by the pumping pipe 8 to spray the water. 9 to the carrier 3
Sprinkle water for Part of the sprinkling passes between the carriers 3, moves from the shelf 1 a to the water receiving portion 1 b, and circulates by returning to the water storage tank 6 through the return pipe 5. During this circulation, the nitrifying bacteria 15 are gradually attached to and fixed to the carrier 3 while growing, and the solidifying nitrifying bacteria 15 also gradually grow. After it was confirmed that nitrifying bacteria were preferentially fixed on the surface of the carrier 3, the odor tube 2
When the amount of odor to the odor is in a steady state, the ammonia component in the odor is surely decomposed, and the exhaust gas containing almost no ammonia is discharged from the exhaust pipe 4 to the outside of the deodorization tank 1.

[0014]

EXAMPLE Using the deodorizing apparatus of the above embodiment, a comparative test was conducted between an example in which nitrifying bacteria were preferentially cultured in a liquid medium in advance and an example using activated sludge as a comparative example. In the case where nitrifying bacteria were preferentially cultured in advance, the number of nitrifying bacteria was about 9% of the total number of bacteria.
0% and the concentration was 10 ⁸ cells / ml. This nitrifying bacterium is mixed with 100 l (liter) of liquid medium for 1 hour.
It was charged into a water storage tank containing 0 m ³ of water. In addition, the concentration of nitrifying bacteria was about 10 ⁶ /
ml of the activated sludge was mixed with the carrier. In each test, the ammonia concentration was 3 at the beginning of operation.
An odor of 00 ppm was sent to the deodorizing tank at an air flow rate of 100 m ³ / min, and water was sprayed. After the initial operation was performed for two weeks, the air volume of the odor was increased to 200 m ³ / min to a steady state, and the ammonia concentration in the exhaust was measured. Then 10
ppm. From the above results, it has been clarified that the apparatus and method of the present invention have remarkably excellent ammonia decomposition performance as compared with the comparative example.

[0015]

As described above, according to the microorganism deodorizing apparatus of the present invention, a carrier for supporting microorganisms, a watering facility for sprinkling water on the carrier, and a water storage tank for collecting sprinkled water are provided. Before the operation of the apparatus, the liquid medium and the nitrifying bacteria cultured preferentially while suppressing the growth of other bacteria are added to the water in the water storage tank. It can be fixed to the carrier by contact, and exhibits excellent ammonia decomposition performance from the beginning of operation.

According to the method for operating a microorganism deodorizing apparatus of the present invention, nitrifying bacteria which have been cultured in advance are added to a carrier or watering by the time of starting operation, so that the pH of the carrier is increased by the time of starting. Thus, the nitrifying bacteria can be fixed to the carrier in a dominant manner by suppressing the increase in the number of bacteria and other bacteria, and as a result, excellent ammonia decomposition performance can be obtained. Further, in the above-mentioned operation method, if the nitrifying bacteria are preferentially grown while suppressing the growth of other bacteria, the superiority of the nitrifying bacteria is further ensured at the initial stage of the operation, and the nitrifying bacteria can be used for other bacteria. Even in nitrifying bacteria having a slower growth rate, superiority can be obtained in fixing to a carrier.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a deodorizing device according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Deodorizing tank 2 Odor pipe 3 Carrier 5 Return pipe 6 Water storage tank 7 Pump 8 Pumping pipe 9 Sprinkling pipe 10 Sprinkling part 15 Nitrifying bacteria

Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 3/34 101 (72) Inventor Kenji Fukushima 1-6-1, Funakoshiminami, Aki-ku, Hiroshima-shi, Hiroshima Japan Steel Works Co., Ltd.

Claims (3)

[Claims] Claims: 1. A carrier for supporting microorganisms, a water spraying device for sprinkling water on the carrier, and a water storage tank for collecting the water sprinkled, and a liquid medium and other water are added to the water in the water storage tank before operation of the device. A microbial deodorizing device characterized by adding nitrifying bacteria, which are preferentially cultured while suppressing bacterial growth. 2. A method for operating a microorganism deodorizing apparatus, comprising: a carrier carrying microorganisms; a water spraying facility for sprinkling water on the carrier; and a water storage tank for collecting water sprinkled, wherein the microorganisms deodorize odors containing ammonia gas. The method for operating a microbial deodorizer, characterized in that nitrifying bacteria previously cultured are added to a carrier or water spray at least at the start of operation. 3. The method for operating a microorganism deodorizing apparatus according to claim 2, wherein the nitrifying bacteria are grown preferentially while suppressing the growth of other bacteria.