JP2001212424A - Biological deodorizing device using ceramic carrier for immobilizing microorganism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a biological deodorizing device using a ceramic carrier for immobilizing microorganisms, which is enhanced in washing effect on a reaction product by performing the replacement of holding water by water spraying. SOLUTION: This device has a filter bet part in the mid-way of a flow passage of raw gas in a reaction tower, and the filter bed part is constituted with plural carriers 11 for immobilizing the microorganisms, and the carriers 11 are composed of a ceramic material in which air gap is formed by plural communicative pores 12 and also the carriers 11 have 0.5-2 mm pore diameter of the communicative pores 12 and 400-500 kg/m3 water holding capacity.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biological deodorizing apparatus using a ceramic carrier for immobilizing microorganisms on which microorganisms are immobilized.

[0002]

2. Description of the Related Art Conventionally, as a biological deodorizing apparatus using a ceramic carrier for immobilizing microorganisms, there is a biological deodorizing apparatus described in Japanese Patent No. 2562236, as shown in FIGS.

In FIGS. 4 and 5, a filter bed type biological deodorization tower 1 is shown.
Has a filter bed 2 inside, and the filter bed 2 is formed of a ceramic carrier 3 for immobilizing microorganisms. The ceramic carrier 3 for immobilizing microorganisms is used to fix and grow microorganisms such as nitrifying bacteria and sulfur oxidizing bacteria involved in deodorization. The ceramic carrier 3 has countless communication holes and has a porosity in the carrier of 40 to 5 at the time of filling.
It has voids and shapes that make up 0%.

[0004] A sprinkler 4 is provided above the filter bed 2, and the sprinkler 4 communicates with a circulating water tank 5 provided at the bottom of the filter bed type biological deodorization tower 1. The filter bed type biological deodorization tower 1 has a lower part communicating with a supply source of the odor gas 6 and an upper part communicating with the activated carbon adsorption tower 9 via a mist separator 7 and a deodorizing fan 8. The circulating water tank 5 communicates with a makeup water system 10 and a neutralizing agent supply system 11.

[0005] With this configuration, in the filter bed type biological deodorization tower 1, circulating water supplied from the circulating water tank 5 is sprinkled from the sprinkler 4 toward the ceramic carrier 3 for immobilizing microorganisms in the filter bed portion 2 and sprinkled. Moisture is retained in the communicating holes of the microorganism-immobilized ceramic carrier 3, and microorganisms such as sulfur-oxidizing bacteria and nitrifying bacteria are grown on the surface of the microorganism-immobilizing ceramic carrier 3 and inside the communicating holes.

[0006] The raw gas 6 flowing from the lower part of the filter bed type biological deodorization tower 1 passes through the filter bed part 2 a reducing sulfur compound or a reducing nitrogen compound which is a malodorous component, and converts it into a ceramic carrier for immobilizing microorganisms. Degraded by microorganisms such as sulfur oxidizing bacteria and nitrifying bacteria that adhere to the surface.

[0007] The nitrate and sulfate ions generated by the decomposition are washed away by the circulating water supplied from the sprinkler 4 and neutralized in the circulating water tank 5. The processing gas that has decomposed the malodorous components flows into the activated carbon adsorption tower 9 through the mist separator 7 and the deodorizing fan 8, and removes the odor components that could not be removed by the filter bed type biological deodorizing tower 1.

[0008]

In the above construction, the basic characteristics of the carrier for obtaining high odor removal characteristics include a large gas contact surface area, a high water retention ability, and easy cleaning of the reaction product. , High microorganism retention ability, sufficient strength, low airflow resistance and no blockage.

By the way, the gas contact surface area of the carrier can be increased as the pore diameter of the communicating hole forming the void in the carrier is reduced, when the porosity is constant. However, the smaller the pore diameter, the greater the effect of the surface tension of the water held in the communication hole, and the effect of replacing the water held in the communication hole by watering operation and washing the reaction products in the communication hole. Has a problem that it becomes a hindrance in performing an efficient biological reaction.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a biological deodorizing apparatus using a ceramic carrier for immobilizing microorganisms, in which the retained water is replaced by sprinkling water and the effect of washing the reaction product is enhanced. Aim.

[0011]

In order to solve the above problems, a biological deodorizing apparatus using a ceramic carrier for immobilizing microorganisms according to the present invention comprises a filter bed in the middle of a raw gas flow path in a reaction tower. Having, the filter bed part is composed of a plurality of carriers for immobilizing microorganisms, the carrier is made of a ceramic material having a void formed by a plurality of communication holes, the hole diameter of the communication holes is 0.5 to 2 mm, Moisture retention is 400-500kg
/ M ³ .

With the above-described structure, the carrier holds the water sprinkled in the reaction tower in the communication hole, and grows microorganisms such as sulfur oxidizing bacteria and nitrifying bacteria on the surface and inside the communication hole. In the reaction tower, reducing sulfur compounds and reducing nitrogen compounds, which are malodorous components in the raw gas flowing into the tower, are decomposed by microorganisms such as sulfur oxidizing bacteria and nitrifying bacteria. The nitrate ions and sulfate ions generated by the decomposition are washed away from the surface of the carrier by water sprayed into the reaction tower, and are removed by replacing water retained in the communication holes by a water spray operation.

At this time, the smaller the hole diameter, the greater the effect of the surface tension of the water held in the communication hole, so that the water held in the communication hole is replaced by a water spray operation, and the reaction products in the communication hole are removed. It becomes difficult to wash. On the other hand, the larger the pore size, the smaller the gas contact surface area of the carrier.

Therefore, there is an appropriate value for the hole diameter, and in the present invention, the appropriate value of the hole diameter of the communication hole is 0.5 to 2 mm.
The pores are formed by the communicating holes of this pore diameter, the carrier is formed so that the water retention amount is 400 to 500 kg / m ^3, and the optimal balance between the gas contact area, the cleaning effect, and the water retention ability is determined. Embodied.

[0015] This makes it possible to exchange the water held in the communication hole with new water without being affected by surface tension, so that a large number of reaction products (such as sulfate ions) can be washed out by spraying water once. -It is possible to discharge, and it is possible to maintain a high microbial activity by securing a pH buffering capacity by a newly large water retention amount, so that a biological reaction for deodorization can be efficiently performed.

[0016]

Embodiments of the present invention will be described below with reference to the drawings. Since the biological deodorizing apparatus of the present invention has the same basic configuration as that described above with reference to FIGS. 4 and 5, detailed description of each member will be made with reference to the reference numerals shown in FIGS. 4 and 5. Omitted.

In FIG. 1, a ceramic carrier 3 for immobilizing microorganisms, which constitutes a main part of the present invention, is made of a ceramic material in which a plurality of communicating holes 12 form a void. The microorganism carrier 3 has a water retention of 400.
Having a capacity of up to 500 kg / m ^3, and the diameter of each communication hole 12 being 0.5 to 2 mm, preferably 1 to 1.5 mm.
mm.

The ceramic carrier 3 for immobilizing microorganisms is filled in a filter bed type biological deodorization tower 1 to form a filter bed 2. Hereinafter, the operation of the above configuration will be described. The ceramic carrier 3 for immobilizing microorganisms retains the circulating water sprinkled into the tower from the sprinkler 4 in the communication hole 12, and grows microorganisms such as sulfur oxidizing bacteria and nitrifying bacteria on the surface and inside the communication hole 12. .

In the tower, a reducing sulfur compound or a reducing nitrogen compound, which is a malodorous component in the raw gas passed through the filter bed 2 from below, is converted into sulfur oxidizing bacteria or nitrifying bacteria fixed on the ceramic carrier 3 for immobilizing microorganisms. Decomposed by microorganisms such as bacteria.

Nitrate ions and sulfate ions generated by the decomposition are removed from the surface of the carrier by circulating water sprinkling into the tower, and are removed by replacing water retained in the communication hole 12 by sprinkling operation.

At this time, the ceramic carrier 3 for immobilizing microorganisms has a communication hole 12 having a hole diameter of 0.5 to 2 mm and a water retention of 400 to 500 kg / m ³ , so that the gas contact area, the cleaning effect and the water retention Noh and the best balance.

This will be described with reference to FIGS. FIG. 2 shows the relationship between the amount of water sprayed on the carrier and the sulfate ion remaining rate in the carrier, and FIG. 3 shows the relationship between the amount of water sprayed on the carrier and the amount of sulfate ion discharged. 2 and 3, each of A and B has only a thin communication hole having a hole diameter of 10 to 100 μm.

C indicates a carrier having a plurality of communication holes having a hole diameter of about 1 mm and having a water retention of 235 kg / m ³ , and D indicates a carrier having a plurality of communication holes having a hole diameter of about 1 mm. Indicates a carrier having a weight of 460 kg / m ³ , and E indicates a carrier having a plurality of communication holes having a hole diameter of about 1 mm and having a water retention amount of 435 kg / m ³ .

In FIG. 2, carriers A and B have a watering rate of 0.6.
In the case of m ³ / m ³ -power, the residual ratio of sulfate ion is 70.
~ 80%. On the other hand, carriers C, D, and E have a watering rate of 0.2
~ 0.3m ³ / m ³ -Tower with sulfate ion residual ratio of 5
It is about 0%. That is, carriers C and D having a pore size of 1 to 2 mm compared to carriers A and B having a small pore size of 10 to 100 μm.
In E, the replacement of the retained water of the carrier by the watering operation can be performed with high efficiency without being affected by the surface tension, indicating that the cleaning effect by watering is high.

FIG. 3 shows that the carriers C, D and E emit a larger amount of sulfate ions than the carriers A and B, indicating that the cleaning effect is higher. However, the carrier C having the communicating hole having the same hole diameter of 1 mm or more is shown. , D, the carrier D having a large amount of water retention among E,
E indicates that the cleaning effect is higher than that of the carrier C.

[0026]

As described above, according to the present invention, a gap is formed in a carrier by a plurality of communication holes having a hole diameter of 0.5 to 2 mm, and the water retention amount is set to 400 to 500 kg / m ^3.
By doing so, it is possible to exchange the water held in the communication holes with new water without being affected by surface tension, so that a large number of reaction products (such as sulfate ions) can be washed and discharged with a single spray. Can be done. In addition, since a large water retention amount can maintain the pH buffering ability and maintain a high microbial activity, a biological reaction for deodorization can be efficiently performed.

[Brief description of the drawings]

FIG. 1 is a schematic view showing a ceramic carrier for immobilizing microorganisms according to an embodiment of the present invention.

FIG. 2 is a graph showing the relationship between the amount of water sprayed on a carrier and the residual ratio of sulfate ions in the carrier.

FIG. 3 is a graph showing the relationship between the amount of water sprayed on a carrier and the amount of sulfate ion discharged.

FIG. 4 is a schematic view showing a conventional biological deodorizing apparatus.

FIG. 5 is a schematic diagram showing a conventional mechanism of biological deodorization.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Filter bed type biological deodorization tower 2 Filter bed part 3 Ceramic carrier for immobilization of microorganisms 4 Sprinkler 5 Circulating water tank 6 Odor gas 12 Communication hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 53/60 B01D 53/34 116A 53/77 ZAB C04B 38/00 303 122Z C12M 1/40 129Z C12N 11 / 14 133 // C12N 1/20 (72) Inventor Tomohiro Katata 1-47, Shikitsuhigashi 1-chome, Namiwa-ku, Osaka-shi, Osaka (72) Inventor Yuki Matsubayashi Yuki Matsubayashi, Shikitsu-higashi, Naniwa-ku, Osaka, Osaka 1-chome 2-47 F-term in Kubota Corporation (reference) 4B029 AA05 AA21 BB02 CC03 CC10 4B033 NA01 NA12 NB27 ND04 ND11 NE02 NE10 NF02 NF06 NF10 4B065 AA01X AC20 BB02 BC42 CA56 4D002 AA02 AA41 BA02 DA03 GA01 GB09 GB12 GB20 4G019 FA11 FA13

Claims (1)

[Claims] 1. A reactor has a filter bed in the middle of a flow path of a raw gas in a reaction tower, and the filter bed comprises a plurality of carriers for immobilizing microorganisms. And the diameter of the communication hole is 0.5 to 2 mm.
In, biological deodorization device using a ceramic carrier for immobilizing microorganisms, characterized in that it has a shape that water retention amount is 400~500kg / m ^3.