JP2001129363A - Method for treating malodor or hazardous gas and device therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent environmental pollution by collecting a hazardous gas containing a malodor molecule or airborne bacteria and detoxifying them. SOLUTION: A gas material so be treated is introduced into a treatment chamber 21 and then cooled to liquefy. The resultant liquefied martial L is decomposed by the photocatalyst reaction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for treating an odor or a harmful gas, and more particularly to a technique for treating an odor or a harmful gas utilizing a photocatalytic reaction.

[0002]

2. Description of the Related Art For example, in a garbage processing machine for business use, a fermentation type process in which garbage is decomposed by microorganisms into organic fertilizers or special fertilizers for soil improvement, or garbage is processed into sawdust and coffee grounds. It is treated by a method such as a disintegration type treatment in which it is mixed with the bacterial bed and decomposed into water and carbon dioxide. However, in the conventional processing method, no consideration is given to the processing of the odor or harmful gas generated during the processing.

In a conventional commercial garbage disposer, putrefactive bacteria and fermentative bacteria are mixed without being distinguished. The promotion of fungal growth may also proceed, and non-pathogenic bacteria may be transformed into an environment for the growth of pathogenic bacteria. In particular, a growth gene such as Escherichia coli is simply recombined and has a high growth rate. If Escherichia coli O157 starts to proliferate by mixing with these spoilage bacteria, there is a considerable possibility that the entire processing machine will be contaminated.

Further, in these garbage disposal machines, heat stirring is generally performed, and the above-mentioned odorous or harmful molecules are included as floating bacteria in water vapor generated at the time of the heat stirring, so that odorous gas or harmful gas is contained in the atmosphere. It is released as waste or discharged as sewage. Needless to say, this causes environmental pollution.

[0005]

Therefore, the present inventor has proposed:
It is a proposal to collect and detoxify such harmful gas containing odorous molecules or floating bacteria, thereby preventing environmental pollution and in the above-mentioned garbage disposal machine. Another object of the present invention is to provide a novel method and apparatus for treating a bad odor or harmful gas, which can prevent contamination of the processing machine and can further improve the processing efficiency.

[0006]

That is, the invention of claim 1 is characterized in that a gas to be processed is introduced into a processing chamber, cooled and liquefied, and the liquid is decomposed by a photocatalytic reaction. Pertaining to a method for treating offensive odors or harmful gases.

According to a second aspect of the present invention, there is provided a processing chamber having an inlet for a gas to be processed and an outlet for discharging a liquid to be processed, and for cooling and liquefying the gas to be processed in the processing chamber. , A photocatalytic reaction member provided with a photocatalytically active titanium oxide layer disposed in the processing chamber, and an ultraviolet irradiation device for irradiating the photocatalytic reaction member. The present invention relates to a device for treating stench or harmful gas.

According to a third aspect of the present invention, there is provided a method for treating an odorous or harmful gas according to the second aspect, wherein the photocatalytic reaction member is formed by coating an anatase type titanium oxide powder having excellent crystallinity after anodizing a titanium material. Related to the device.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the accompanying drawings. FIG. 1 is a schematic process diagram showing an outline of a method for treating offensive odor or harmful gas according to the present invention, FIG. 2 is a cross-sectional view showing one embodiment of the processing apparatus, and FIG. 3 is an example in which the present invention is applied to a garbage processing machine. FIG.

First, as shown in FIG. 1, according to the first aspect of the present invention, a to-be-processed gas body having a bad odor or a harmful gas is introduced into a processing chamber, collected, cooled and liquefied, and The substance is decomposed by a photocatalytic reaction. The gas body to be treated contains, for example, a bad smell or a harmful gas generated during the above-mentioned garbage disposal. Offensive odors include putrefactive odors such as hydrogen sulfide and methyl mercaptan, ammonia odors, and pungent odors. Examples of harmful gases include NOx and airborne bacteria, particularly gases containing putrefactive bacteria and fungi.

The gas to be treated containing the above-mentioned odorous or harmful gas is introduced into the chamber and collected. The inside of the chamber is always kept in a high humidity state, and a cooling device is provided. Therefore, in the chamber,
The gas to be processed collected from outside the chamber is condensed and liquefied into a liquid by the action of the cooling device. The liquid material contains molecules of bad smell and harmful gas when collected in the chamber.

The chamber is provided with a photocatalytic reaction member exhibiting a photocatalytic reaction. When the liquid material adheres to the photocatalytic reaction member, molecules causing a bad odor or a harmful gas are subjected to the photocatalytic reaction to be efficiently decomposed to be odorless and harmless. The odorless and detoxified treatment liquid flows out of the chamber as wastewater.

A detailed description will be given below, together with an embodiment of an apparatus for treating odor or harmful gas as defined in claim 2. The processing apparatus 20 shown in FIG. 2 is used as a garbage generating gas processing apparatus of the garbage processing machine shown in FIG. 3, and this embodiment will be described below. As shown in FIG. 3, the processing apparatus (garbage generating gas processing apparatus) 20 is attached to a commercial garbage processing apparatus 10. The garbage processing apparatus 10 has a garbage processing section 12 that decomposes garbage by heat and stirring. Above the garbage processing section 12, the garbage generating gas processing apparatus 20 is disposed. In the figure, reference numeral 11 denotes a casing of the garbage disposal device 10.

The garbage processing section 12 is a known section for decomposing garbage by heat and stirring, and may be any of the above-mentioned fermentation-type processing and separation-elimination-type processing. Then, a garbage generating gas processing device 20 is disposed above the garbage processing unit 12. The garbage generated gas processing device 20 is disposed above the garbage processing unit 12 so as to easily collect gas generated from garbage, and may be inside the casing 11. ,
It may be external.

The processing apparatus 20 includes a processing chamber 21
, A cooling device 25, a photocatalytic reaction member 30, and an ultraviolet irradiation device 35. The processing chamber 21 has an inlet 22 for the raw garbage gas G, which is a gas to be processed, and an outlet 23 for a processing liquid. The processing chamber 21 of the embodiment is formed of a stainless steel box, and the gas introduction unit 22 is formed of a window. In addition, the discharge part 23 for the treated liquid is formed of a drain hole 23a formed on the opposite side, which is separated from the gas introduction part 22. Reference numeral 23b denotes a drain pipe, and reference numeral 24 denotes a step of the discharge unit 23.

The cooling device 25 is a device for cooling and liquefying the garbage generating gas introduced into the processing chamber 21 from the introduction section 22. In this embodiment, a cooling coil 25a and a cooler 25b are arranged near the gas inlet 22. The garbage generating gas G heated and heated by the garbage processing section 12 is introduced into the chamber 21 from the gas introduction section 22, and a temperature difference is generated by cooling of the cooling device 25, resulting in a high humidity state and dew condensation. Liquefied.

The photocatalytic reaction member 30 is provided in the processing chamber 21 and has a titanium oxide layer having photocatalytic activity to which the liquid material L adheres. The photocatalytic reaction member 30 is a publicly known one, and is made of a metal plate of titanium oxide or a titanium oxide alloy, and causes a liquid L condensed with the garbage generating gas G to adhere to generate a photocatalytic reaction.

The photocatalytic reaction member 30 includes:
As defined in the third aspect of the present invention, it is preferable that the titanium material is anodized and then coated with anatase type titanium oxide powder having excellent crystallinity. This is commercially available as, for example, high-performance antibacterial titanium “SPARKT” (trade name of Kobe Steel Ltd.).

The ultraviolet irradiation device 35 irradiates the photocatalytic reaction member 30 and is a known lamp which is commercially available as a photocatalytic reaction excitation lamp.

In addition to the above components, a suction fan 40 for sucking the gas G in the garbage processing apparatus is disposed in the processing chamber 21 as shown in FIG. It is preferable for collecting.

Further, as shown in the embodiment, a partition plate 45 is provided in the chamber 21 so that the liquid L is temporarily removed in order to effectively perform the photocatalytic reaction of the liquid L of the garbage generating gas G. May be stored. In the embodiment, a partition plate 45 having a height of 2 cm is provided substantially at the center of the chamber 21 so that the gas introduction section side space 21A and the discharge section side space 2 are provided.
1B, the liquid L is temporarily retained in the gas inlet side space 21A to perform a photocatalytic reaction, and the liquid L overflowing the partition plate 45 is further discharged.
A photocatalytic reaction is performed in B. In the embodiment, since the step portion 24 is provided in the discharge portion 23, the treated liquid material flows out of the drain portion 23b through the step portion 24.

According to the present invention, as described above, the garbage generating gas as the gas to be processed is introduced into the processing chamber,
It is cooled and liquefied, and the liquid material is decomposed by photocatalytic reaction, so that putrefactive odor molecules and suspended bacteria contained in the garbage generated gas are oxidatively decomposed and made odorless and harmless. Is discharged to the outside.

[0023]

As described above, according to the method and apparatus for treating stench or harmful gas according to the present invention, a gas containing a stench or harmful molecule together with suspended bacteria in water vapor is collected and made harmless. This makes it possible to prevent the air from being released into the atmosphere as a bad smell or harmful gas, or from being discharged as sewage, thereby preventing environmental pollution.

[Brief description of the drawings]

FIG. 1 is a schematic process diagram showing an outline of a method for treating a malodorous or harmful gas according to the present invention.

FIG. 2 is a sectional view showing an embodiment of a garbage generating gas processing apparatus.

FIG. 3 is a sectional view showing an example in which the garbage generating gas processing apparatus is applied to a garbage processing machine.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Garbage processing apparatus 11 Casing 12 Garbage processing part 20 Garbage generation gas processing apparatus 21 Processing chamber 22 Introducing part 23 Discharge part 25 Cooling apparatus 30 Photocatalytic reaction member 35 Ultraviolet irradiation apparatus 40 Suction fan G Garbage generation gas L Liquid material

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) B01J 35/02 B01J 37/02 301M 37/02 301 A61L 2/02 Z 2/10 // A61L 2/02 B01D 53 / 36 ZABJ 2/10 B B09B 3/00 H B09B 3/00 DF term (Reference) 4C058 AA27 AA30 BB02 BB06 CC01 EE26 KK02 4C080 AA07 AA10 BB02 CC01 HH05 KK08 MM02 QQ17 4D004 AAA AAAAAAAAAA48A08A48A08A48A08A48A48A04A03A17 AB01 AB03 AB05 AB06 BA07X BA13X BA41X BB03 CA01 CD10 EA01 EA10 4G069 AA04 AA08 AA09 AA11 BA04A BA04B BA04C BA48A BA48C BB04A BB04B BB04C CA04 CA07 CA10 CA13 CA17 DA06 EA11 EC22X FB11 FB23

Claims (3)

[Claims] 1. A method for treating malodorous or harmful gas, comprising introducing a gas to be processed into a processing chamber, cooling and liquefying the liquid, and decomposing the liquid by a photocatalytic reaction. 2. A processing chamber having an inlet for a gas to be processed and a discharge unit for a processing liquid, a cooling device for cooling and liquefying the gas to be processed in the processing chamber, and An apparatus for treating odor or harmful gas, comprising: a photocatalytic reaction member provided with a photocatalytically active titanium oxide layer disposed in a chamber; and an ultraviolet irradiation device for irradiating the photocatalytic reaction member. . 3. The apparatus according to claim 2, wherein the photocatalytic reaction member is obtained by anodizing a titanium material and then coating anatase-type titanium oxide powder having excellent crystallinity.