JP2002095927A - Deodorizing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for efficiently deodorizing an offensive smell component over a long period of time using honeycomb activated carbon while suppressing pressure loss low. SOLUTION: Gas containing an offensive smell component is brought into contact with wet honeycomb activated carbon (especially, the number of cells is 10-1,500/inch2 and a BET specific surface is 200 m2/g or more) to be subjected to deodorizing treatment. The offensive smell component is hydrogen sulfide, mercaptans, sulfides, disulfides, ammonia, amines, aldehydes, organic acids or the like. After the gas containing the offensive smell component is treated with the wet honeycomb activated carbon, the treated gas is deodorized by dry honeycomb activated carbon (especially, chemical supported honeycomb activated carbon having chemicals such as iodine, inorganic iodide, bromine or the like). By this constitution, the offensive smell component can be almost perfectly deodorized over a long period of time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to odor sources or odor generating facilities, such as sewage treatment plants, sludge treatment plants, urine treatment plants, livestock facilities, chemical plants, painting plants, fertilizer plants, garbage compost, etc. The present invention relates to a deodorizing method for efficiently deodorizing a gas containing a generated odor component (a malodorous or off-flavor gas).

[0002]

2. Description of the Related Art Various odor components are generated from odor sources (for example, sewage treatment plants and sludge treatment plants). The main components of the odor component are sulfur-based compounds such as hydrogen sulfide and methyl mercaptan, nitrogen-containing compounds such as ammonia and amine acid, and aldehydes. As a method for deodorizing a gas containing these odor components, it is known to use granular activated carbon. However, if the gas contains a large amount of water, a good deodorizing effect cannot be exhibited. In particular, exhaust gas from a garbage disposal machine (such as garbage compost) has a high temperature (30 to 10).
(5 ° C.), humid, and containing various types of odor components, the life of activated carbon is extremely short.

[0003] It is known that these odor components are deodorized by the action of microorganisms. For example, Tokiko 7-143
No. 44 discloses a microbial deodorant in which microorganisms are immobilized on a carrier in which porous ceramic granules are welded around thermoplastic polymer granules in order to biochemically treat wastewater and malodorous gas. . In Japanese Patent Publication No. 3-65208, a cold water-insoluble granular water-containing polymer carrier coated with a powdered inorganic substance such as activated carbon or zeolite is filled in a ventilating cylinder, and after acclimating microorganisms, the odor is applied to the packed layer. A biological deodorization method in which waste elements are aerated is disclosed. Japanese Patent Application Laid-Open No. 9-16 / 1994 for biochemically treating organic wastewater and the like.
No. 3981 discloses an entrapping immobilized microorganism carrier in which microorganisms and powdered activated carbon are entrapped and immobilized on the surface of a porous nucleus with an immobilizing agent.

[0004] However, since the carriers in these biological deodorizations are granular and indefinite in shape, the pressure loss is large,
And the gas-liquid contact effect is small, and the deodorizing performance is low. In particular,
At high space velocities and high linear velocities, odor components cannot be effectively deodorized.

[0005]

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a method capable of deodorizing odor components with high efficiency over an extremely long period of time without the action of microorganisms, while suppressing an increase in pressure loss. It is in.

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventor has found that a gas containing an odor component is brought into contact with a honeycomb-shaped activated carbon in a wet state, and if necessary, further dried. The inventors have found that the odor component can be highly deodorized over a long period of time while reducing pressure loss by contacting the honeycomb-shaped activated carbon in a state, and the present invention has been completed.

That is, the present invention provides (1) a deodorizing method in which a gas containing an odor component is brought into contact with a wet honeycomb activated carbon, and (2) a honeycomb activated carbon having 10 to 1.5 cells.
The method of deodorizing 00 pieces is / inch ² (1), (3) an odor component, hydrogen sulfide, Metakaputan acids, Surufiddo acids, Jisurufiddo acids, ammonia, amines, aldehydes, at least one member selected from organic acids (1) a deodorizing method according to (1), (4) a deodorizing method according to (1), wherein the BET specific surface area of the honeycomb activated carbon is 200 m ² / g or more;
(5) The gas linear flow velocity with respect to the honeycomb activated carbon is 0.0
(1) Deodorizing method of 1-3 m / sec, (6) Space velocity of gas with respect to honeycomb activated carbon is 500-10.
(1) a deodorizing method of 000 / hr, (7) after contacting a gas containing an odor component with a wet honeycomb activated carbon, the remaining gas containing an odor component is further dried into a honeycomb activated carbon. (8) The number of cells is 10 to 1,500 cells / inch ² , the BET specific surface area is 200 m ² / g or more, and the linear flow rate of gas to the honeycomb activated carbon is 0.01. ~ 3m / s
ec, space velocity 500-100,000 / hr,
The honeycomb-shaped activated carbon in a dry state has 10 to 1,50 cells.
0 / inch ² , BET specific surface area 200 m ² / g or more, gas linear flow rate with respect to the honeycomb activated carbon 0.1 to 5 m / g
(7) The deodorizing method according to (7), wherein the space velocity is 1,000 to 500,000 / hr, and (9) at least the honeycomb-shaped activated carbon in a dry state is selected from a drug-free honeycomb activated carbon and a drug-loaded honeycomb activated carbon. It is a kind (7)
(10) The deodorizing method according to (9), wherein the chemical of the chemical-supporting honeycomb activated carbon is at least one selected from iodine, inorganic iodide, bromine, inorganic bromide, and acid, and (11) odor component (1) to (10), wherein the gas containing is an exhaust gas from a garbage disposer.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, odor components are deodorized by a wet honeycomb activated carbon. Moreover, after deodorizing with the honeycomb-shaped activated carbon in a wet state, a trace amount of odor components remaining in some cases are deodorized with the honeycomb-shaped activated carbon in a dry state, whereby the deodorizing component can be more completely removed.

Examples of the activated carbon of the honeycomb-shaped activated carbon used in the wet state or the dry state include wood-based activated carbon (coconut shell, charcoal, etc.), coal-based activated carbon, pitch-based activated carbon, and resin-based activated carbon (polyacrylonitrile, rayon,
Activated carbon derived from a phenolic resin). The activated carbon may be activated carbon that has been activated, for example, gas activated (activated by steam, carbon dioxide, oxygen, etc.) or activated by chemicals (activated by zinc chloride or the like). Further, after the raw material of the activated carbon is formed in a honeycomb shape in advance, the activated carbon may be prepared by activation.

[0010] The honeycomb-shaped activated carbon can be produced by various methods, for example, the production method disclosed in Japanese Patent Publication No. 57-95816. To be specific about the method for producing honeycomb activated carbon, in the first production method, activated carbon raw material powder (charcoal, coal, coke, coconut husk, sawdust, etc.), a binder, a forming aid, and if necessary, an activator, After being kneaded with water and molded into a honeycomb shape, it is carbonized by a usual method and activated to obtain a honeycomb-shaped activated carbon.

In the second production method, the honeycomb activated carbon obtained by the first production method is decalcified with an acid, water or the like, if necessary, to obtain a honeycomb activated carbon.

In the third production method, powdered activated carbon, a binder,
The forming aid is kneaded with water, molded into a honeycomb shape, and then, if necessary, heat-treated to obtain a honeycomb activated carbon. The powdered activated carbon is
Activated carbon raw materials (charcoal, coal, coke, coconut husk, sawdust, etc.) are added, if necessary, with a binder and an activator,
It can be obtained by molding into a suitable shape (a columnar shape, a pellet shape, a crushed shape, etc.), carbonizing, activating, decalcifying with an acid or water as required, and finely pulverizing.

The binder can be selected from organic binders (thermoplastic resins and thermosetting resins) and inorganic binders according to the method for producing the honeycomb-shaped activated carbon. Organic binders include thermoplastic resins (olefin resins, vinyl acetate resins, polyvinyl alcohol resins, acrylic resins, styrene resins, polyester resins, polyamide resins, thermoplastic polyurethane resins, cellulose derivatives, natural Resins, polysaccharides, etc.), thermosetting resins (urethane resins, epoxy resins, phenolic resins, furan resins, urea resins, silicone resins, thermosetting acrylic resins, etc.), tar, pitch, etc. For example, the inorganic binder includes clay minerals such as Kibushi clay and activated clay. These binders can be used alone or in combination of two or more.

As the forming aid, for example, polysaccharides, cellulose derivatives, natural resins, surfactants and the like can be used.

The honeycomb-shaped activated carbon thus obtained is usually composed of fine particles of activated carbon and has a very dense structure. The carbon content of the honeycomb activated carbon is not particularly limited, and is, for example, 30% by weight or more (for example,
About 30 to 100% by weight, preferably 40 to 90% by weight
Degree). Further, the honeycomb-shaped activated carbon may be composited with the porous ceramic. In the composite, zeolite or the like is particularly preferably used.

The BET specific surface area of the honeycomb-shaped activated carbon is usually 200 m ² / g or more (for example, 200 to 3,500 m
² / g), preferably 300 m ² / g or more (for example, 3 m ² / g).
00 to 3,000 m ² / g), more preferably 350
m ² / g or more (e.g., 350~2,500m ² / g)
It is.

The number of cells of the above-mentioned honeycomb activated carbon can be selected within a range in which an increase in pressure loss can be suppressed.
1,500 pieces / inch ² , preferably 20 to 750
Pieces / inch ² , more preferably 25 to 500 pieces / i.
nch is about ^2.

The opening ratio of the honeycomb is 50 to 80%, preferably about 55 to 75%.

The honeycomb-shaped activated carbon can be usually used by laminating (filling) it in a ventilable deodorizing device such as a deodorizing tower.
The honeycomb-shaped activated carbon is laminated such that the gas flow direction and the honeycomb-shaped activated carbon ventilation holes (opening portions) are in the same direction. The honeycomb may be formed by one honeycomb, or may be formed by a plurality of honeycombs. The plurality of honeycombs may be arranged in a vertical and / or horizontal manner together with the thickness direction as necessary. When a plurality of honeycombs are arranged in the thickness direction, the cells of adjacent honeycombs may be shifted from each other. While continuously or intermittently circulating (particularly intermittently) an aqueous medium (such as an aqueous solution containing water and / or a chemical) through a packed bed of a deodorizing apparatus provided with an inlet for a gas to be processed and an outlet for a processing gas, By passing the odor component-containing gas to be treated (especially air containing the odor component) and bringing the odor component into contact with the honeycomb-shaped activated carbon, physical and
It can be deodorized chemically efficiently. It is necessary to supply the aqueous medium so that the honeycomb-shaped activated carbon does not come off from the wet state. Preferably, the aqueous medium is supplied intermittently in such an amount that a liquid film is formed on the entire surface of the honeycomb-shaped activated carbon. And the honeycomb-shaped activated carbon is washed. The pH of the aqueous medium attached to the honeycomb-shaped activated carbon is in a pH range that is not suitable for the growth or growth of microorganisms, for example, less than pH 2, preferably pH 1.8 or less.

The flow direction of the aqueous medium and the gas containing the odorous component is not particularly limited, and may be, for example, an upward flow, a downward flow, or the like. From the viewpoint of operability, it is preferable to flow the aqueous medium as a downward flow.

In the present specification, the term "odorous component" is used to include a harmful component. The type of the odor component is not particularly limited. For example, sulfur-containing compounds (such as hydrogen sulfide, mercaptans such as methyl mercaptan, sulfides such as methyl sulfide, and disulfides such as methyl disulfide), nitrogen-containing compounds (ammonia, dimethylamine Aldehydes (formaldehyde, acetaldehyde, etc.), organic acids (formic acid, acetic acid, propionic acid, butyric acid, valeric acid, etc.). The gas to be treated usually contains at least one of these odor components, and may contain a plurality of odor components. The concentration of the odor component is not particularly limited, and is, for example, 0.1 to 1,000 pp.
m (based on capacity).

The temperature of the gas containing the odorous component can be selected, for example, from -10 ° C to 45 ° C, preferably from 0 to 40 ° C.
C., preferably about 15 to 35 C.).

The space velocity (SV) of the gas to be treated with respect to the activated honeycomb carbon in a wet state is, for example, 500 to 100,000 / h depending on the type and concentration of the odor component.
r can be selected from a range of preferably about 1,000 to 80,000 / hr, more preferably about 1,500 to 50,000 / hr, and the linear velocity (LV) of the gas to be treated with respect to the honeycomb layer is, for example, 0.5. It can be selected from the range of about 01 to 3 m / sec, preferably about 0.05 to 2.5 m / sec, and more preferably about 0.1 to 2 m / sec.

When such a honeycomb activated carbon is used,
The odor component can be deodorized while greatly reducing the pressure loss, and the power cost for ventilation can be extremely reduced. Since the dispersibility of the gas containing the odor component and the aqueous medium is particularly high for the honeycomb activated carbon, the contact efficiency with the odor component and the gas-liquid contact efficiency are improved, and the odor component can be removed smoothly and efficiently, and compact deodorization is possible. The odor component can be effectively removed by the device. In addition, as long as the honeycomb-shaped activated carbon keeps a wet state, the deodorizing ability can be maintained for an extremely long time.

By contacting the honeycomb-shaped activated carbon with a gas containing an odor component in a wet state, the odor component can be effectively deodorized over a long period of time. That is, it is possible to deodorize at a physically and chemically high level with the honeycomb-shaped activated carbon in a wet state without acclimating microorganisms and the like. Further, by using the honeycomb-shaped activated carbon, the contact efficiency with the odor component and the contact efficiency with the aqueous medium become extremely large, and a high deodorizing efficiency can be exhibited even under a high space velocity and a high linear flow velocity. Further, the honeycomb shape enables stable deodorization performance to be obtained even when the concentration of odorous components fluctuates, and harmful components flow in. Furthermore, even if an aqueous medium is intermittently sprayed, the distribution of moisture and gas on the surface of the honeycomb-shaped activated carbon is uniform, and a high deodorizing effect can be exhibited. Since the exhaust gas from the garbage disposer is generally hot and humid, only a small amount of water needs to be sprayed on the honeycomb activated carbon. It may even be enough to spray water once. Therefore, the method of the present invention is suitable for deodorizing gas generated from these garbage disposal machines. In the present invention, the wet state means that the water content in the honeycomb-shaped activated carbon is changed on a dry basis by continuous or intermittent supply of an aqueous medium or supply of a high humidity (for example, a relative temperature of 85% or more) gas. The dry state refers to a state where the water content in the honeycomb activated carbon is less than 50% by weight on a dry basis.

Even with such a honeycomb-shaped activated carbon in a wet state, the space velocity and the linear velocity are further increased to perform deodorization treatment, or depending on the kind of the odor component, the odor component may not be completely deodorized. In such a case, the processing gas in the first deodorization step is obtained by combining the deodorization with the honeycomb-shaped activated carbon in the wet state (first deodorization step) and the deodorization with the honeycomb-shaped activated carbon in the dry state (second deodorization step). A small amount of odor components remaining in the odor components can be deodorized by the honeycomb-shaped activated carbon in the second deodorization step, so that the odor components can be substantially completely removed.

The honeycomb activated carbon used in the second deodorizing step is the same as the honeycomb activated carbon used in the first deodorizing step (that is, the number of cells is 10 to 1,
500 pieces / inch ² , BET specific surface area 200 m ² /
g or more of honeycomb-shaped activated carbon). In particular, the second deodorizing treatment using honeycomb activated carbon is characterized in that deodorization is performed in a dry state without supplying an aqueous medium by spraying the honeycomb activated carbon. Therefore, while supplying the aqueous medium, the gas containing the odor component is brought into contact with the honeycomb activated carbon, then gas-liquid separated, and the separated gas is further contacted with the dried honeycomb activated carbon.

In the second deodorization step, deodorization is performed in a dry manner. As the honeycomb-shaped activated carbon, a chemical-free honeycomb-type activated carbon may be used. Depending on the type of odor components remaining in the gas after deodorization, the chemical-loaded honeycomb is used. Activated carbon may be used. Further, the non-drug-supported honeycomb activated carbon and the drug-supported honeycomb activated carbon may be used in combination.

When both are used in combination,
The non-chemical-carrying honeycomb activated carbon may be provided upstream or downstream of the gas flow path.

The chemical carried on the honeycomb-shaped activated carbon used in the second deodorizing step can be selected according to the kind of the odor component, and is not particularly limited. For example, as the chemical-supporting honeycomb, a honeycomb supporting various chemicals such as an acidic compound, an alkaline compound, and a neutral compound can be used.For example, an acid-supporting honeycomb [for example, activated carbon supporting citric acid or an alkali metal citrate salt] can be used. Honeycomb (JP-A-59-
No. 151963), the phosphoric acid compound is 1 to 20
Wt% activated carbon honeycomb (JP-A-59-2277)
No. 04), a honeycomb-like deodorant supporting a solid acid (Japanese Patent Application Laid-Open No. Sho 61-172561), a chemical-supporting honeycomb supporting an acid, an alkali, or a weakly acidic chemical such as iron halide (Japanese Patent Application Laid-Open No. JP-A-62-262742), a honeycomb impregnated with 0.1 to 20% by weight of an acid or alkali such as sulfuric acid (JP-A-52-63882), a honeycomb supporting iodine [for example, iodine and ammonium iodide Activated carbon honeycomb (UK Patent 109063)
No. 06), a honeycomb deodorant in which an oxide of iodine and / or an oxo acid of iodine is supported on activated carbon (see Japanese Patent Publication No. 62-9377), potassium permanganate and phosphoric acid Activated carbon honeycomb, honeycomb supporting iodine or iodine compound and phosphoric acid [for example, honeycomb supporting iodine or iodine compound and boric acid or phosphoric acid (JP-A-50-131847), alkali metal iodine compound (Eg, LiI, Na
_{I, KI, KI 3, RbI} , CsI , etc.) and phosphoric acid (orthophosphoric acid, condensed phosphoric acid, metaphosphoric acid, pyrophosphoric acid) and the like loaded with honeycombs (see Japanese Patent Laid-Open No. 6-126166)] can be mentioned .

These drug-carrying honeycombs can be used alone or in combination of two or more.

Preferred chemicals include iodine, bromine, inorganic iodine compounds, inorganic bromides, acids and the like. These chemicals may be carried alone or in combination of two or more.

The inorganic iodine compounds include I₂O₅, NH
₄I, metal iodides and the like. As metal iodide
For example, LiI, NaI, NaIO₃, KI, KI
O₃, RbI, CsI and other alkali metal iodides: Ca
I₂, SrI₂, BaI₂, MgI₂Alkali iodide etc.
Lithium earth metal: CuI, CuI₂Period of elements such as AgI
Table Ib Group Metal Iodides: ZnI₂Periodic Table of Elements I
Group Ib metal iodide: AlI₃Periodic Table II
Group I metal iodide: CrI₃Group VI of the periodic table
Metal iodide: MnI₂Periodic Table VII Group Gold
Genus Iodide: CoI₂, NiI₂Periodic Table of Elements V
Group III metal iodides and the like. Preferred nothing
Machine iodide contains NH₄I, KIO₃, Alkali iodide
Metal, CoI ₂, NiI₂, ZnI₂And so on.
Particularly preferred inorganic iodides include alkali metal iodides,
Among them, potassium iodide is included. Iodine, inorganic iodide
One or more types can be used.

The supporting of iodine and / or inorganic iodide on the honeycomb activated carbon used in the second deodorization step can be carried out by a conventional method. For example, iodine and / or an inorganic iodide may be dissolved or dispersed in water, an organic solvent such as alcohols, and sprayed, impregnated or immersed in the honeycomb activated carbon to support the honeycomb activated carbon. At this time, iodine and / or inorganic iodide may be kneaded as a raw material in the form of a solution or a fine powder, formed and supported. In the case of iodine, the activated carbon in a solid state may be sprayed on the honeycomb activated carbon, for example, heated to 100 to 150 ° C. to support the activated carbon, or adsorbed on the honeycomb activated carbon in a liquid or gaseous state, or KI, It may be dissolved in an aqueous solution such as NH ₄ I and supported by spraying, impregnating or dipping. Further, if necessary, after supporting iodine and / or inorganic iodide on the activated carbon honeycomb,
It may be dried or fired.

The amount of iodine and / or inorganic iodide carried on the honeycomb activated carbon can be selected within a range that does not impair the deodorizing / adsorbing ability for odor components, and is usually about 0.1 to 40 in terms of iodine. % By weight, preferably about 0.
It is about 2 to 20% by weight, more preferably about 0.4 to 10% by weight.

Inorganic bromides correspond to the above-mentioned inorganic iodides
Can be exemplified. Inorganic bromide is the inorganic iodine
Can be carried on the honeycomb-shaped activated carbon in the same manner as the compound. bromine
The supported honeycomb activated carbon is a liquid form of the honeycomb activated carbon.
Method of spraying, impregnating and dipping bromine, gaseous bromine
Method of contacting with cam-like activated carbon, bromine in KBr, NH ₄
Dissolve in aqueous solution such as Br or organic solvent and spray, contain
It can be supported by a method of dipping or dipping.

The amount of bromine carried on the honeycomb activated carbon is usually about 1 to 30% by weight, preferably about 2 to 20% by weight, particularly preferably about 5 to 15% by weight. The amount of the inorganic bromide carried on the honeycomb activated carbon can be selected from the same range as that of the inorganic iodide in terms of bromine.

As the acid to be supported, for example, phosphoric acid,
Examples include inorganic acids such as sulfuric acid and nitric acid, and organic acids such as oxalic acid, malonic acid, tartaric acid, succinic acid, citric acid, malic acid, and glutaric acid. Preferred acids include, for example, phosphoric acid, sulfuric acid, oxalic acid, malic acid, and the like. One or more of these acids can be used. More preferred acids include phosphoric acid. Examples of the phosphoric acid include orthophosphoric acid, metaphosphoric acid, polyphosphoric acid (chain polyphosphoric acid such as pyrophosphoric acid, cyclic polyphosphoric acid such as trimetaphosphoric acid, tetrametaphosphoric acid, and infinite chain metaphosphoric acid). Preferred phosphoric acids include orthophosphoric acid. One or more phosphoric acids can be used.

The supporting of the acid on the honeycomb activated carbon can be carried out by a conventional method. For example, an acid may be sprayed, impregnated, or immersed in the honeycomb activated carbon in the form of an aqueous solution or dispersion to support the activated carbon.When producing the honeycomb activated carbon, the acid alone or the acid aqueous solution and the dispersion are used as raw materials. They may be formed collectively and carried. Also, if necessary,
After supporting the acid on the honeycomb-shaped activated carbon, drying may be performed.

The amount of acid carried on the honeycomb activated carbon is as follows:
Usually, it is about 1 to 40% by weight, preferably about 2 to 30% by weight, and more preferably about 5 to 20% by weight.

In the second deodorizing step, the honeycomb-shaped activated carbon can be used by stacking (filling) in a ventilable deodorizing apparatus such as a deodorizing tower, as in the first deodorizing step. Each of the honeycomb-shaped activated carbons in the wet state and the dry state may be provided in the same deodorizing apparatus to constitute a single deodorizing apparatus. If necessary, a honeycomb-type activated carbon in the first deodorizing step may be interposed with a gas-liquid separation unit. The deodorizing apparatus may be configured by connecting the upstream deodorizing unit, which is laminated or filled with, and the downstream deodorizing unit, which is formed by laminating or filling the honeycomb-shaped activated carbon in the second deodorizing step, in an air-permeable manner.

The linear flow rate of the gas to be treated with respect to the honeycomb activated carbon used in the second deodorization step is usually about 0.1 to 5 m.
/ Sec, preferably about 0.3 to 4 m / sec, and more preferably about 0.5 to 3 m / sec. The space velocity of the gas to be treated is usually about 1,000 to 500,0.
00 / hr, preferably about 2,000-300,000
/ Hr, more preferably about 4,000 to 250,000
/ Hr.

By combining such a second deodorizing treatment with the first deodorizing treatment, the odor components can be completely deodorized in the honeycomb-shaped activated carbon layer. In the first deodorization step, usually, most of the odor components, for example, 75 to 99.
About 5% by volume, preferably about 80 to 99% by volume, more preferably about 85 to 98% by volume is removed, and the remaining odor components (eg,
The design should be such that 25-0.5% by volume of the odor component) is substantially completely removed.

The gas treatment conditions in the first and second deodorization steps can be appropriately set. However, in the case where odor components are continuously deodorized, it is operationally advantageous to deodorize at a common temperature. is there. In addition, the deodorization treatment can be performed by combining the first deodorization treatment step and the second deodorization treatment step in various modes. For example, a plurality of first deodorization units are connected in parallel and / or in series, respectively. May be. In this case, the number of each deodorizing unit can be appropriately selected from the range of about 2 to 20 depending on the odor component, the concentration, the type of the generation source, and the like. Further, the first deodorizing unit and the second deodorizing unit may be connected in series to treat the odor component, and the odor component may be treated in the first deodorizing process in which a plurality of first deodorizing units are arranged in parallel. After the components are processed in parallel, the processing gases from each first deodorizing unit may be collected or combined and provided to a second deodorizing unit. The first deodorizing unit and the second deodorizing unit may be replaced with wet honeycomb-type activated carbon and dry honeycomb-type activated carbon in a cartridge type.

[0045]

The present invention will be described below in more detail with reference to Examples and Comparative Examples, but the present invention is not limited by these.

Example 1 and Comparative Example 1 BET specific surface area 850 m ² / g, number of cells 300 / in
ch ² , honeycomb-shaped activated carbon A having an outer diameter of 4 cm and a thickness of 3 cm
Was laminated on a column having an inner diameter of 4 cm so that the layer length became 18 cm. Two such columns (column a and column b) were prepared and set vertically. In column a and column b, hydrogen sulfide, 1.0 ppm, methyl mercaptan 0.
An atmosphere containing 2 ppm (temperature: 25 ° C., relative humidity: 80%) was subjected to a linear flow rate of 100 m / sec (space velocity: 20,000
0 / hr), and the column a was sprayed with 15 ml / min of water for 4 minutes in a downward flow at intervals of 15 minutes, and the water content in the honeycomb activated carbon was 70%. % Or more (Example 1), while column b did not spray water (Comparative Example 1). The sulfur compound concentration of the gas at the inlet and outlet of the column a and the column b was analyzed by FPD gas chromatography, and the deodorizing performance was examined. Column b
Then, after 30 days, hydrogen sulfide and methyl disulfide began to leak, whereas column a was completely deodorized after 60 days. The pH of the drain water flowing down from the column a was 1.2, sulfuric acid and methyl sulfonic acid were confirmed, and no attached or fixed microorganisms having a deodorizing ability were observed on the honeycomb-like activated carbon in the column a. .

Example 2 The honeycomb-shaped activated carbon A of Example 1 (BET specific surface area 850)
m ² / g) to support 7.5% by weight of bromine to prepare a honeycomb activated carbon B. Honeycomb activated carbon A with inner diameter 4c
The layers were stacked on a column c of m so that the layer length became 18 cm, and the column c was set vertically (first deodorization step). Further, the honeycomb-shaped activated carbon B was laminated on a column d having an inner diameter of 4 cm so as to have a layer length of 18 cm, and the column d was set vertically (second deodorization step). The column c and the column d were connected by a glass tube having an inner diameter of 1.5 cm, and a band heater was wound around the glass tube to raise the temperature of the flowing gas by 5 to 7 ° C. Note that a drain pot was provided below the column c. From the top of column c, 1.0 ppm of hydrogen sulfide, 0.2 ppm of methyl mercaptan, 0.12 pp of methyl sulfide
m, an atmosphere containing 0.05 ppm of methyl disulfide and 0.05 ppm of trimethylamine (25 ° C., 80% relative humidity) while flowing at a linear flow rate of 100 cm / sec.
The operation of sprinkling water at 4 ml / min for 4 minutes was repeated at intervals of 15 minutes to reduce the water content in the honeycomb-shaped activated carbon to 70%.
Wt% or more. The gas flowing out of the column c was passed through the column d in an upward flow, and the deodorizing effect was traced and analyzed by gas chromatography. As a result, three days after the gas flow, methyl sulfide and methyl disulfide began to leak to the outlet gas of the column c, and their odor was felt. However, the outlet gas of column d is odorless even after 80 days,
Even when analysis was performed by gas chromatography, the odor component was below the detection limit.

EXPERIMENTAL EXAMPLE 3 The exhaust gas from a garbage disposer for composting about 30 kg of garbage a day was deodorized with the following wet honeycomb activated carbon. That is, a BET specific surface area of 900 m ² / g of 150 m
mx 150 mm (cross-sectional area 225 cm ² ), thickness 30 mm
Exhaust gas from a garbage disposer was passed from the top of a column in which nine honeycomb-shaped activated carbons (300 cells / inch ² ) were stacked at an average linear flow rate of 1.5 m / sec. Garbage processing time is
This operation was repeated every day for about 8 hours a day. During the operation of the garbage disposal machine, it is possible to maintain a wet state without spraying water on the honeycomb-shaped activated carbon every day. After the garbage disposal, 20 liters of water from the top of the honeycomb-shaped activated carbon layer are evenly distributed. Sprayed. By doing so, the exhaust gas from the garbage disposal machine could be efficiently deodorized for at least 120 days.

[0049]

According to the present invention, since the honeycomb activated carbon in the wet state is used, the pressure loss can be reduced, the dispersibility of the gas containing the odor component and the aqueous medium can be improved, and the gas-liquid contact efficiency can be increased. . Further, even under a high space velocity and a high linear flow velocity, the odor component can be effectively and efficiently deodorized for a long period of time with a compact device. Further, when the honeycomb-shaped activated carbon in a wet state and the honeycomb-shaped activated carbon in a dry state are combined, an odor component can be almost completely and efficiently deodorized for an extremely long time.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 53/44 B01D 53/34 116J 53/48 117A 53/52 121C 53/54 126 53/58 128 B09B 3 / 00 ZAB 131 // B01J 20/20 B09B 3/00 ZABD 20/34 F term (reference) 4D002 AA03 AA05 AA06 AA13 AA14 AA32 AA40 AB02 AC10 BA02 BA03 BA04 CA07 DA26 DA35 DA41 DA53 EA03 EA09 GA01 GB12 GB20 4A004 A004 CB06 CC11 4D020 AA04 AA08 AA09 BA07 BA12 BA23 CA05 CB08 CC16 CD03 DA03 DB20 4G066 AA05B AA05C AA08B AA11B AA32B BA07 BA20 BA26 BA42 CA01 CA24 CA25 CA27 CA29 CA52 DA02 FA12 GA11

Claims (11)

[Claims] 1. A deodorizing method in which a gas containing an odor component is brought into contact with a honeycomb-shaped activated carbon in a wet state. 2. The number of cells of the honeycomb activated carbon is 10 to 1.5.
00 pieces / inch ² and deodorizing method according to claim 1, wherein the. 3. An odor component comprising hydrogen sulfide, metacaptans,
The deodorizing method according to claim 1, wherein the method is at least one selected from sulfides, disulfides, ammonia, amines, aldehydes, and organic acids. 4. A honeycomb activated carbon having a BET specific surface area of 20
The deodorizing method according to claim 1, which is 0 m ² / g or more. 5. The deodorizing method according to claim 1, wherein the linear flow rate of the gas with respect to the honeycomb activated carbon is 0.01 to 3 m / sec. 6. The method according to claim 1, wherein the space velocity of the gas with respect to the honeycomb-shaped activated carbon is 500 to 100,000 / hr. 7. A deodorizing method wherein a gas containing an odor component is brought into contact with a honeycomb-shaped activated carbon in a wet state, and then the gas containing an odor component is further contacted with a honeycomb-shaped activated carbon in a dry state. 8. The honeycomb-shaped activated carbon in a wet state has a cell number of 1
0-1,500 pieces / inch ² , BET specific surface area 200m
² / g or more, a linear flow velocity of gas with respect to the honeycomb activated carbon of 0.01 to 3 m / sec, and a space velocity of 500 to 100,0.
00 / hr, dried honeycomb-shaped activated carbon containing 10 to 1,500 cells / inch ² and a BET specific surface area of 20
0 m ² / g or more, linear flow velocity of gas to the honeycomb activated carbon of 0.1 to 5 m / sec, space velocity of 1,000 to 50
The deodorizing method according to claim 7, wherein the rate is 000 / hr. 9. The deodorizing method according to claim 7, wherein the honeycomb-shaped activated carbon in a dry state is at least one selected from a drug-free honeycomb-shaped activated carbon and a drug-loaded honeycomb-shaped activated carbon. 10. The deodorizing method according to claim 9, wherein the chemical of the chemical-supporting honeycomb activated carbon is at least one selected from iodine, inorganic iodide, bromine, inorganic bromide, and acid. 11. The deodorizing method according to claim 1, wherein the gas containing an odor component is an exhaust gas from a garbage disposal machine.