JPH02139017A - Deodorizing process - Google Patents

Abstract

PURPOSE:To decompose or adsorption remove almost completely smelly gas in the air by mixing the smelly gas with ozone, decomposing the same in the presence of a catalyst, and then adsorption-removing an undecomposed smelly component by means of an active carbon layer provided on the downstream side of the catalyst. CONSTITUTION:Smelly gas is mixed with ozone generated by an ozone generator 5 in an ozone and smelly component mixing chamber 6 and decomposed in the presence of a catalyst 7. Then, an undecomposed smelly component is adsorption-removed by means of an active carbon layer 12 provided on the downstream side of the catalyst 7. As a result, the smelly gas in the air is almost completely decomposed or adsorption-removed. The adsorption removal of smelly component by means of the active carbon layer is limited to the component which could not been treated by the ozone catalyst process, and said active carbon layer retains adsorption performance for a long period of time to reduce the maintenance jobs such as replacement and regeneration.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a deodorizing method using ozone, and more particularly to a deodorizing method that can almost completely remove malodorous components and maintain deodorizing performance for a long period of time. It is something.

[Prior Art] Bad odors emitted from food storage areas such as refrigerators, toilets, livestock stands, etc., and even f! There is a method of using ozone as a means to deodorize bad odors in industrial exhaust gas. FIG. 3 is a schematic explanatory diagram of a deodorizing device 1 used for the above deodorizing.

A ventilation path 4 is formed in the deodorizing device 1 and communicates between an intake port 2 and an exhaust port 3, and an ozone generator 5. Ozone/malodorous component mixing chamber 6. A catalyst layer 7 and an intake fan 8 are provided. The ozone generator 5 is connected to a transformer 10 that generates high voltage.

Therefore, the air containing malodorous gases such as ammonia and hydrogen sulfide is removed from the air passage 4 of the deodorizing device 1 by the suction force of the intake fan 8.
The ozone is sucked into the interior in the direction of the arrow C, mixed with ozone generated in the ozone generator 5 in the mixing chamber 6, and then fed to the catalyst layer along the direction of the arrow C. In the catalyst layer 7, the malodorous gas is oxidized and decomposed into odorless components, which are then discharged outside the machine from the exhaust port 3 (arrow D).

[Problems to be Solved by the Invention] In ozone decomposition treatment, acid components such as acetic acid and propionic acid are somewhat difficult to decompose, and may be discharged as they are from the exhaust port 3 without being partially decomposed.

In addition, if alcohol or aldehyde is included in the foul-smelling gas, it will be oxidized to the corresponding acid by ozone decomposition treatment, but the acid that cannot be partially decomposed will be left at the exhaust port 3.
may be excreted.

Therefore, the odor caused by the acid component is felt in the gas after treatment, which may reduce the reliability of the deodorizing device.

Therefore, the present inventors have conducted extensive research to provide a deodorizing method that can remove the odor of acid components that are difficult to decompose even in ozone decomposition treatment, and can maintain this deodorizing performance over a long period of time, and have completed the present invention. .

[Means for Solving the Problems] The method of the present invention that achieves the above object mixes malodorous gas with ozone, decomposes it in the presence of a catalyst, and then transports undecomposed malodorous components downstream of the catalyst. The gist of this is to adsorb and remove it using the activated carbon layer provided.

[Operations and Examples] FIG. 1 is a cross-sectional explanatory diagram of a deodorizing device using the method of the present invention, in which an ozone generator 5. The catalyst layer 7 and the intake fan 8 are arranged in the ventilation passage 4 in the same order as in the conventional device example shown in FIG. An activated carbon layer 12 is provided downstream of the intake fan 8 and in front of the exhaust port 3. Therefore, the air containing malodorous gas taken in from the intake port 2 is mixed with ozone sent out from the ozone generator 5, and while passing through the catalyst layer 7, malodorous components such as ammonia and hydrogen sulfide are decomposed there. The air containing acid components, etc., which has not been decomposed by the catalyst N7 is further fed to the activated carbon layer 12 by the suction force of the intake fan 8, where the acid components, etc. remaining in the air are adsorbed and removed. As a result, no odor components remain in the discharged air at the exhaust port 3.

The catalyst layer 7 is generally made of a metal or metal oxide supported on a carrier and is formed by aggregating cells in a lattice shape or a honeycomb shape, but is not particularly limited. In addition, the activated carbon layer 12 may be formed into a honeycomb shape or the like similar to the catalyst layer 7, or may be filled with granular activated carbon so as to exhibit a predetermined ventilation resistance. The arrangement position is not limited to the one shown, and if it is downstream of the catalyst layer 7, the upstream position of the intake fan 8 (12
) may also be used.

With the above configuration, since relatively clean air after ozone decomposition treatment is supplied to the activated carbon layer 12, the adsorption performance of the activated carbon layer 12 can be maintained for a long period of time until adsorption saturation. Further, it is preferable that the catalyst layer 7 and the activated carbon layer 12 be structured so that they can be attached and detached in the ventilation passage 4, so that they can be easily replaced with new ones.

Experimental example> A deodorizing device with the structure shown in Figure 1 was installed on the toilet seat 21 of a Western-style toilet.
It was attached to the side (see Figure 2), and its deodorizing effect was judged by the subject's sense of smell 6 months after the start of use. The catalyst layer 7 has a geometric surface area of 1800 m'/a', a specific surface area of 120 m'/g, and a cell number of 210 cells/1n.
A ch2 honeycomb-shaped catalyst is used, and an activated carbon layer 1 is used.
No. 2 was formed into a honeycomb shape with a cell count of 200 cells/1 nch2.

Furthermore, the deodorizing device 1 is equipped with a human body detection sensor, and has a structure that starts when a person is in the toilet and automatically stops a few seconds after the person comes out, and the amount of suction air from inside the toilet bowl 20 is reduced. is 0.17+n' per minute of light, the ozone generation concentration is 0.5ppm, and the unit air volume is i n+3/
The catalyst contact surface area per hour was 0.035 m2.

When the deodorizing effect was evaluated by five test subjects, all of them found that they did not feel any odor.

[Effects of the Invention] According to the present invention, it has become possible to adsorb and remove odor components that cannot be decomposed even by the ozone catalyst method, and it has become possible to almost completely decompose or adsorb and remove malodorous gases in the air.

In addition, the adsorption and removal of malodorous components in the activated carbon layer is
Since the activated carbon layer is limited to components that cannot be treated by the catalytic method, the activated carbon layer can maintain its adsorption performance over a long period of time and requires less maintenance such as replacement or regeneration.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional explanatory diagram showing an example of the deodorizing device applied to the present invention, FIG. 2 is an explanatory diagram showing an example of use of the deodorizing device in FIG. 1, and FIG. 3 is a schematic diagram showing an example of the deodorizing device. It is an explanatory diagram. 1...Deodorizing device 2...Intake port 3...Exhaust port 4...Air passage 5...Ozone generator 6...Ozone/malodorous component mixing chamber 7...Catalyst layer 8...・Intake fan lO・・
・Transformer 12...Activated carbon layer 20...Toilet bowl 21...Toilet seat 1st

Claims (1)

[Claims] A deodorizing method characterized by mixing malodorous gas with ozone, decomposing it in the presence of a catalyst, and then adsorbing and removing undecomposed malodorous components by an activated carbon layer provided downstream of the catalyst.