KR102557943B1 - Physical and Chemical Deodorization System and Method using Gaseous Chlorine Dioxide Adsorption on Silica Gel and UV Irradiation as well as Adsorption-Desorption on-Shifts Process - Google Patents

Abstract

The present invention relates to a malodor removal system and method capable of effectively removing malodor with low removal efficiency by a single method composed of complex components of an organic compound and an inorganic compound. The malodor removal system of the present invention includes a chlorine dioxide precursor layer generating chlorine dioxide by ultraviolet irradiation; a UV lamp layer disposed on the front or rear surface of the chlorine dioxide precursor layer to irradiate ultraviolet rays; A first unit including a titanium oxide photocatalyst layer disposed on the front or rear surface of the UV lamp layer and an adsorbent layer disposed on the rear surface of the chlorine dioxide precursor layer to adsorb chlorine dioxide, and an ozone removal catalyst and a second unit including an activated carbon box containing activated carbon and installed at the rear end of the first unit. The odor removal system of the present invention generates chlorine dioxide from chlorine dioxide precursors in situ by irradiation with ultraviolet rays by a UV lamp to oxidize and chemically remove odor molecules, adsorb chlorine dioxide to an adsorbent to increase the reaction time between chlorine dioxide and odor molecules, increase the removal efficiency of odor molecules, physically and chemically remove odor molecules by radicals and ozone generated by UV irradiation by UV lamps and titanium oxide photocatalysts, and adsorb odor molecules to activated carbon It is physically removed and residual ozone is removed using an ozone removal catalyst, thereby effectively removing the odor of complex components including organic compounds and inorganic compounds.

Description

Physical and Chemical Deodorization System and Method using Gaseous Chlorine Dioxide Adsorption on Silica Gel and UV Irradiation as well as Adsorption-Desorption on-Shifts Process}

The present invention relates to a malodor removal system that effectively removes odors generated in various industrial fields, and more particularly, to a malodor removal system and method for effectively removing malodors with low removal efficiency in a single method, which are composed of complex components of organic compounds and inorganic compounds by using chlorine dioxide, a UV lamp, and activated carbon in combination.

Recently, as citizens' awareness of the environment has improved and the desire for a more pleasant living environment has increased, civil complaints about odor problems are gradually increasing.

The causative substances that cause odor are organic compounds such as ammonia, hydrogen sulfide, methyl mercaptan, amines, aldehydes, volatile organic compounds (VOCs) and various inorganic compounds contained in air pollutants. Components that cause these odors are highly irritating and adversely affect the lives of residents directly and indirectly.

Components that cause odor have the most demanding and difficult to treat characteristics among air pollutants, and there are many types, and various components act in combination. Since there are individual differences in the sense of smell that accepts odors, it is difficult to indicate the degree of sensation and damage to odors, and the description or expression of odors often differs from person to person. In addition, odor components have a problem in that they are difficult to quantitatively indicate because geographical weather conditions or time fluctuations must be taken into account when using a certain standard or measurement method for discomfort caused therefrom.

Conventionally, physical methods, chemical methods, and biological methods are known as methods for removing malodor. Photooxidation using UV light, titanium oxide catalyst utilization, activated carbon adsorption, etc. are known as physical methods, chlorine dioxide, ozone, etc. are widely known as chemical methods, and microbial filters are being studied as biological methods.

Chlorine dioxide is a strong oxidizing agent that effectively oxidizes various organic and inorganic compounds. Based on its excellent oxidizing power, it effectively oxidizes and removes ammonia, mercaptans, hydrogen sulfide, methyl sulfide, methyl disulfide, amines, and aldehydes, which are the main components of odor. The reaction equation in which chlorine dioxide removes odor-causing substances is as follows.

(1) Ammonia

2NH ₃ + 2ClO ₂ + H ₂ O → NH ₄ ClO ₂ + NH ₄ ClO ₃

(2) Mercaptan

CH ₃ SH + 2ClO ₂ + H ₂ O → CH ₃ SO ₃ H + 2HOCl

CH ₃ SO ₃ H + NH ₃ → CH ₃ SO ₃ NH ₄

(3) hydrogen sulfide

5H ₂ S + 8ClO ₂ + 4H ₂ O → 5H ₂ SO ₄ + 8HCl

2NH ₃ + H ₂ SO ₄ → (NH ₄ ) ₂ SO ₄

NH ₃ + HCl → NH ₄ Cl

(4) methyl sulfide

(CH ₃ ) ₂ S + 2ClO ₂ + H2O → (CH ₃ ) ₂ SO + 2HClO ₂

(5) Methyl disulfide

2(CH ₃ ) ₂ S + 4ClO ₂ + 2H ₂ O → (2CH ₃ ) ₂ S ₂ O ₂ + 4HClO ₂

(6) Amines

(CH ₃ ) ₃ N + 2ClO ₂ + H ₂ O → (CH ₃ ) ₃ NO + 2HClO ₂

(CH ₃ ) ₃ N + HCl → (CH ₃ ) ₃ NHCl or (CH ₃ ) ₃ N + H ₂ SO ₄ → [(CH ₃ ) ₃ NH] ₂ SO ₄

(7) Aldehyde

RCHO + ClO ₂ → RCOOH

(8) Acetaldehyde

CH ₃ CHO + ClO ₂ → CH ₃ COOH

The final product produced by the reaction of the methyl sulfide, methyl disulfide, and amines with chlorine dioxide is a non-toxic and odorless material.

However, since chlorine dioxide has a characteristic of self-decomposition as shown in the following reaction formula in a natural state, its utilization is very limited because it must be prepared immediately before use on the site, and sodium chlorite, hydrochloric acid, sodium hypochlorite When producing chlorine dioxide, there is a problem of using hazardous chemicals such as sodium as raw materials.

2ClO ₂ + H ₂ O → HClO ₂ + HClO ₃

In addition, in the case of chlorine dioxide, sulfur compounds such as hydrogen sulfide are removed very efficiently, but there is a disadvantage that it cannot be removed because it does not react with organic compounds or volatile organic compounds (VOCs).

The method using ozone has a problem of requiring excessive energy, the method of using a titanium oxide catalyst has a problem of requiring expensive parts, and the activated carbon adsorption method using activated carbon has a problem of replacing or regenerating activated carbon micropores when they are saturated due to odor molecules.

In addition, the conventional odor removal methods as described above have limitations in that only partial effects can be obtained because it is difficult to remove all odors because the odor generated is not a single component but a complex of organic and inorganic compounds.

Republic of Korea Patent Registration No. 10-1834139 Korean Patent Registration No. 10-0665800 Republic of Korea Patent Registration No. 10-1874338 Korean Patent Publication No. 10-2021-0078379 Korean Patent Publication No. 10-2020-0126116

In order to solve the above problems, the present invention oxidizes odor molecules with chlorine dioxide generated instantly by ultraviolet irradiation of a UV lamp, increases the reaction time between chlorine dioxide and odor molecules by adsorbing chlorine dioxide to an adsorbent layer, physicochemically removes odor molecules with radicals and ozone generated by a UV lamp and a titanium oxide photocatalyst, physically removes odor molecules by adsorbing them to activated carbon, and removes residual ozone using an ozone removal catalyst. It is an object of the present invention to provide a malodor removal system that effectively removes odors of complex components including inorganic compounds.

In order to achieve the above object, in the present invention,

A chlorine dioxide precursor layer generating chlorine dioxide by ultraviolet irradiation; a UV lamp layer disposed on the front or rear surface of the chlorine dioxide precursor layer to irradiate ultraviolet rays; A first unit including a titanium oxide photocatalyst layer disposed on the front or rear surface of the UV lamp layer and an adsorbent layer disposed on the rear surface of the chlorine dioxide precursor layer to adsorb chlorine dioxide;

A second unit including an activated carbon box containing an ozone removal catalyst and activated carbon and installed at a rear end of the first unit is provided.

In the malodor removal system, the chlorine dioxide precursor layer preferably includes at least one selected from the group consisting of sodium chlorite, a mixture of sodium chlorite and an organic acid, and persulfate. More preferably, the chlorine dioxide precursor layer includes potassium persulfate.

In the malodor removal system, the adsorbent layer preferably includes zeolite or silica gel.

In the malodor removal system, the catalyst for removing ozone preferably includes hopcalite (CuMnO _x ), which is a composite of manganese oxide and copper oxide.

In the malodor removal system, the activated carbon box preferably contains activated carbon and a catalyst for removing ozone in a weight ratio of 90 to 95:5 to 10.

In the malodor removal system, the activated carbon box may preferably have a honeycomb shape.

In the odor elimination system, the second unit is preferably installed in plurality at the rear end of the first unit, and more preferably is installed in a branched form at the rear end of the first unit.

Also, in the present invention,

oxidizing malodorous molecules with chlorine dioxide generated by irradiation of ultraviolet rays by a UV lamp;

Adsorbing the chlorine dioxide on an adsorbent layer to react the adsorbed chlorine dioxide with odor molecules;

Physically and chemically removing malodorous molecules by reacting with radicals and ozone generated by a UV lamp and a titanium oxide photocatalyst;

physically removing malodorous molecules by adsorbing them to activated carbon; and

It provides a malodor removal method comprising the step of removing residual ozone remaining after reacting with the malodorous molecule using an ozone removal catalyst.

In the odor removal method,

Chlorine dioxide generated by ultraviolet irradiation of the UV lamp is preferably,

A chlorine dioxide precursor layer containing at least one selected from the group consisting of sodium chlorite, a mixture of sodium chlorite and an organic acid, and a persulfate is irradiated with ultraviolet rays to generate chlorine dioxide.

In the odor removal method,

The activated carbon and the catalyst for removing ozone are preferably mixed in a weight ratio of 90 to 95:5 to 10 to form a honeycomb activated carbon box.

The odor removal system of the present invention generates chlorine dioxide from chlorine dioxide precursors in situ by irradiation with ultraviolet rays by a UV lamp to oxidize and chemically remove odor molecules, adsorb chlorine dioxide to an adsorbent to increase the reaction time between chlorine dioxide and odor molecules, increase the removal efficiency of odor molecules, physically and chemically remove odor molecules by radicals and ozone generated by UV irradiation by UV lamps and titanium oxide photocatalysts, and adsorb odor molecules to activated carbon It is physically removed and residual ozone is removed using an ozone removal catalyst, thereby effectively removing the odor of complex components including organic compounds and inorganic compounds.

In the second unit, organic compounds adsorbed and accumulated on activated carbon are volatilized and recycled as raw materials for combustion in the combustion chamber, and the energy obtained in this combustion process is recycled in the system of the present invention to minimize the energy used and to minimize processing costs by reusing various parts such as activated carbon necessary for removing odor molecules.

Also, when the second unit is dually used, the odor molecules can be alternately adsorbed and desorbed from the first activated carbon box and the second activated carbon box, thereby eliminating odor without downtime.

1 is a diagram of the malodor removal system of the present invention.
2 is a schematic diagram showing a process in which chlorine dioxide is generated by a UV lamp.
3 is a conceptual diagram explaining the principle of odor removal by a UV lamp and a titanium oxide layer in the first unit of the present invention.
4 is a photograph of an exhaust gas flow distribution plate.
5a and 5b are pictures of a UV lamp, and 5c is a picture of a lamp ballast.
6a and 6b are photographs of titanium oxide catalyst plates.
7a and 7b are photographs showing the hexagonal structure of honeycomb activated carbon.
8a and 8b are photographs of honeycomb activated carbon mixed with a catalyst for removing ozone, which is a composite of manganese oxide and copper oxide.
9 is a photograph of chlorine dioxide adsorbed on silica gel.
10 shows the standard of a UV lamp used in one embodiment.
Figure 11 shows the specifications of the UV lamp ballast used in one embodiment.
12 is a result of measuring malodor at the inlet of the system in an experiment measuring the malodor removal effect when the first unit of the malodor removal system of the present invention is used.
13 is a result of measuring malodor at the outlet of the system in an experiment measuring the malodor removal effect when the first unit of the malodor removal system of the present invention is used.
14 is a result of measuring malodor at the inlet of the system in an experiment to measure the malodor removal effect when the first unit and the second unit, which are the malodor removal system of the present invention, are used.
15 is a result of measuring malodor at the outlet of the system in an experiment measuring the malodor removal effect when the first unit and the second unit, which are the malodor removal system of the present invention, are used.

The malodor removal system of the present invention,

A chlorine dioxide precursor layer generating chlorine dioxide by ultraviolet irradiation; A UV lamp layer disposed on the front or rear surface of the chlorine dioxide precursor layer to irradiate ultraviolet rays; A titanium oxide photocatalyst layer disposed on the front or rear surface of the UV lamp layer; And a first unit including an adsorbent layer disposed on the back side of the chlorine dioxide precursor layer to adsorb chlorine dioxide;

A second unit includes an activated carbon box containing an ozone removal catalyst and activated carbon and is installed at a rear end of the first unit.

The malodor removal method of the present invention,

oxidizing malodorous molecules with chlorine dioxide generated by irradiation of ultraviolet rays by a UV lamp;

Adsorbing the chlorine dioxide on an adsorbent layer to react the adsorbed chlorine dioxide with odor molecules;

Physically and chemically removing malodorous molecules by reacting with radicals and ozone generated by a UV lamp and a titanium oxide photocatalyst;

physically removing malodorous molecules by adsorbing them to activated carbon; and

and removing residual ozone remaining after reacting with the malodorous molecules using a catalyst for removing ozone. In the malodor removal method of the present invention, the malodor is preferably removed using the malodor removal system.

Hereinafter, the present invention will be described in more detail.

The malodor removal system of the present invention is composed of a first unit and a second unit.

1. First Unit

The first unit includes a chlorine dioxide precursor layer for generating chlorine dioxide by ultraviolet irradiation, a UV lamp layer disposed on the front or rear surface of the chlorine dioxide precursor layer to irradiate ultraviolet rays, a titanium oxide photocatalyst layer disposed on the front or rear surface of the UV lamp layer, and an adsorbent layer disposed on the rear surface of the chlorine dioxide precursor layer to adsorb chlorine dioxide. The first unit may be configured in a box shape in a preferred embodiment, but is not limited to this shape.

(1) chlorine dioxide precursor layer

A precursor layer generating chlorine dioxide is disposed in the first unit of the present invention. Chlorine dioxide is a strong oxidizing agent that effectively oxidizes various organic and inorganic compounds, but since it has the property of decomposing itself in a natural state, chlorine dioxide must be prepared from precursors immediately before use.

As the precursor, sodium chlorite, a mixture of sodium chlorite and an organic acid, persulfate, and the like may be preferably used. More preferably, solid (80%) sodium chlorite, gel-type sodium chlorite, a solid or gel-type mixture of sodium chlorite and citric acid, and a persulfate such as potassium persulfate may be used. In one particularly preferred embodiment, solid potassium persulfate may be used.

A chlorine dioxide precursor may be disposed within the first unit in the form of a precursor plate to form a chlorine dioxide precursor layer.

The chlorine dioxide precursor is activated by irradiation of ultraviolet rays generated by a UV lamp disposed in the first unit to generate chlorine dioxide in situ. The process of generating chlorine dioxide by the UV lamp is shown in FIG. 2.

The generated chlorine dioxide effectively oxidizes and removes ammonia, mercaptans, hydrogen sulfide, methyl sulfide, methyl disulfide, amines, and aldehydes, which are the main components of odor.

(2) UV lamp layer

In the first unit, the UV lamp layer is disposed on the front or rear side of the chlorine dioxide precursor layer. Preferably, a plurality of UV lamp layers may be disposed.

The UV lamp generates ultraviolet rays with a wavelength of 185 to 254 nm. In a preferred embodiment, a plurality of UV lamps having a length of 770 mm are disposed to generate powerful high-energy ultraviolet rays having a wavelength of 185 to 254 nm. It is preferable to arrange around 80 UV lamps when the exhaust gas capacity is 300 louves per minute (m3), and around 120 UV lamps when the exhaust gas capacity is 500 louves per minute.

The UV lamp activates the chlorine dioxide precursor to generate chlorine dioxide. In addition, the UV lamp decomposes and removes various odor molecules, including odor molecules that cannot be removed because chlorine dioxide is not oxidized, by decomposing them into carbon dioxide and water. That is, the UV lamp is ammonia, polyethylene, polymer polychlorinated compounds, trimethylamine, hydrogen sulfide, methyl sulfide, methyl mercaptan, dimethyl disulfide, carbon disulfide, styrene, sulfides (R ₂ S), and volatile organic compounds (VOCs). ), benzene, toluene, xylene, and other odor molecules are irradiated with ultraviolet rays of 185-254 nm wavelength, and the odor molecules are decomposed into carbon dioxide and water with strong high-energy light power to remove odor.

In addition, a high-energy UV lamp irradiates UVD light to decompose water and oxygen in the air to generate free oxygen, that is, hydroxyl (OH) radicals and oxygen radicals. Oxygen radicals combine with oxygen to form ozone.

UV + H ₂ O → HO * (active hydroxyl, OH radical)

UV + O ₂ → O *(active oxygen, O radical) + O → O ₃ (ozone, ozone)

Ozone is a strong oxidizing agent that oxidizes and removes various organic and inorganic odor molecules. Representative examples of reactions in which ozone removes malodorous molecules are as follows.

① Hydrogen sulfide

H ₂ S + O ₃ → SO ₂ + H ₂ O

3SO ₂ + 3H ₂ O + O ₃ → 3H ₂ SO ₄

② Ammonia

2NH ₃ + 4O ₃ → NH ₄ NO ₃ + 4O ₂ + H ₂ O

③ carbon

C + 2O ₃ → CO ₂ + 2O ₂

④ Hwang

S + H ₂ O + O ₃ → H ₂ SO ₄

(3) titanium oxide photocatalyst layer

The titanium oxide (TiO ₂ ) photocatalyst layer may be preferably disposed on the front or rear surface of the UV lamp layer in the form of a titanium oxide plate.

The size of the titanium oxide plate is preferably about 1600 mm × 1800 mm × 10 mm based on processing exhaust gas of 500 lubes per minute, but is not limited thereto.

Titanium oxide (TiO ₂ ) is a strong photo-oxidation catalyst. Titanium oxide (TiO ₂ ) photocatalyst uses ultraviolet rays as energy to excite electrons (e ^- ) in the valence band to jump to the conduction band to generate corresponding holes (h ⁺ ) to generate active oxygen radicals and hydroxyl radicals in the valence band. Radicals with strong oxidizing and decomposing power remove formaldehyde, methylamine, benzene, xylene, VOC and other harmful organic substances, contaminants, odors, and bacteria while purifying and decomposing the air to convert harmless and odorless carbon dioxide and water.

Titanium oxide promotes the generation of hydroxyl (OH) radicals through the following reaction, and the action of the generated hydroxyl (OH) radicals further increases the removal efficiency of odor molecules through an oxidation reaction.

TiO ₂ + hν → e ^- + h ⁺ _νb

h ⁺ _νb → h ⁺ _tr

O ₂ + e ^- → O ₂ -

O ₂ ^- + O ₂ -+ 2H+ → H ₂ O ₂ + O ₂

O ₂ ^- + h ⁺ _νb → O ₂

O ₂ ^- + h ⁺ _tr → O ₂

OH ^- + h ⁺ _νb → HO [OH (hydroxyl) radical]

The odor removal mechanism of the generated radicals is shown in Table 1 below.

3 is a conceptual diagram explaining the odor removal principle by the UV lamp and the titanium oxide layer in the first unit.

(4) adsorbent layer

In order to maximize the time for the generated chlorine dioxide gas to react with the odor molecules, an adsorbent layer for adsorbing chlorine dioxide is disposed on the rear side of the chlorine dioxide precursor layer. The adsorbent layer adsorbs the generated chlorine dioxide gas so that the chlorine dioxide and odor molecules can react for a sufficient time.

Chlorine dioxide generated by the reaction of a precursor that generates chlorine dioxide with ultraviolet rays undergoes an oxidation reaction with malodorous molecules. Exhaust gas that generates odor is very fast, with a flow rate of 5m or more per second (500 Lube exhaust gas treatment standard per minute), so conditions for sufficient reaction between odor molecules and chlorine dioxide are required.

The adsorbent layer is disposed behind the chlorine dioxide precursor layer to quickly and sufficiently adsorb chlorine dioxide generated by the reaction of the chlorine dioxide precursor and ultraviolet rays. Since the adsorbed chlorine dioxide can contact the odor molecules and ensure sufficient oxidation reaction, the removal efficiency of the odor molecules can be increased.

As the adsorbent, adsorbents such as silica gel and zeolite may be used. In a preferred embodiment, 60 mesh silica gel may be used.

The adsorbent layer adsorbs and maintains chlorine dioxide for 1 minute at the shortest and 10 minutes at the longest to provide sufficient time for the oxidative deodorization reaction of chlorine dioxide.

2. Second unit

The second unit includes an activated carbon box containing an ozone removal catalyst and activated carbon, and is installed at a rear end of the first unit.

The activated carbon box is preferably filled with a mixture of activated carbon and a catalyst for removing ozone in a certain ratio. Preferably, activated carbon and a catalyst for removing ozone are mixed in a weight ratio of 90 to 95:5 to 10.

Ozone generated by strong ultraviolet irradiation in the first unit takes a long time to decompose (72 hours), so residual ozone that is not used and is not decomposed is discharged to the outside of the first unit. As for the official method for air measurement in Korea, the complex odor measurement method by sensory test is used as a standard method. However, since ozone is perceived as an odor in the human sense of smell, ozone acts as an obstacle in measuring the deodorizing effect. Therefore, residual ozone must be removed, but since the removal of ozone is very limited with activated carbon itself, residual ozone is removed by mixing a catalyst for ozone removal with activated carbon. By removing residual ozone, errors and obstructive factors in deodorization measurement can be eliminated in advance.

As a catalyst for removing ozone, it is preferable to use Hopcalite (CuMnO _x ), which is a complex of manganese oxide (MnO ₂ ) and copper oxide (CuO) known to have excellent ozone removal effect.

An activated carbon box filled with a mixture of activated carbon and an ozone removal catalyst may preferably have a honeycomb shape. In the honeycomb shape, the adsorption area in contact with the exhaust gas is widened, so the effect of removing odor molecules is increased.

The activated carbon box of the second unit additionally adsorbs and removes polymer materials that were not sufficiently removed in the first unit, or decomposition products whose molecules were partly split and cleaved by ultraviolet rays, titanium dioxide, and chlorine dioxide, but which were not completely decomposed into carbon dioxide and water, and removed residual ozone that was not used and was not decomposed.

The second unit is preferably installed in plurality at the rear end of the first unit. More preferably, it may be dually installed in a branched form at the rear end of the first unit. Activated carbon has a problem in that it must be replaced or regenerated every 3 months because micropores that perform adsorption are saturated after a certain period of use. If the second unit is dually installed, since the activated carbon box is doubled as the first activated carbon box and the second activated carbon box, it is possible to continuously remove odor without spending time replacing or regenerating the activated carbon.

That is, the exhaust gas passing through the first unit enters one of the second units and is absorbed by the first activated carbon box, and the purified exhaust gas is discharged through the outlet. At this time, since organic compounds such as volatile organic compounds (VOCs) are intensively accumulated in the micropores of the activated carbon, the micropores of the activated carbon in the first activated carbon box are saturated and the adsorption capacity decreases after a certain period of time. Then, the exhaust gas passing through the first unit is blocked from flowing into the first activated carbon box, and is allowed to flow into the second activated carbon box of another second unit so that adsorption is performed in the highly active, non-saturated, fresh second activated carbon box.

While odor molecules are adsorbed in the second activated carbon box, odorous organic compounds such as volatile organic compounds (VOCs) adsorbed and accumulated in the first activated carbon box are injected with hot air, and when the temperature reaches the boiling point of the adsorbed organic compounds, the adsorbed organic compounds volatilize and escape from the activated carbon micropores and move to a separately installed combustion chamber.

Organic compounds moved to the combustion chamber are recycled as raw materials for combustion and converted to carbon dioxide and water when burned. The energy obtained from the combustion process is used in the system of the present invention.

By using the method of alternately adsorbing and desorbing odor molecules from the first activated carbon box and the second activated carbon box of the dually installed second unit as described above, organic and inorganic compounds that generate odors are completely removed without downtime, and at the same time, organic compounds that generate odors can be recycled as an energy source while using activated carbon semi-permanently.

The present invention will be described in detail through the following examples. These examples are illustrative of the present invention, but the scope of the present invention is not limited thereto.

<Example 1>

An embodiment of the malodor removal system of the present invention will be described with reference to FIG. 1 .

Exhaust gas enters the exhaust gas inlet (1) and passes through the filter (2). At this time, a HEPA (High Efficiency Particulate Air) filter was used as a filter. The HEPA filter can filter more than 99.97% of particles with a size of 0.3㎛ in the exhaust gas.

Exhaust gas passing through the filter 2 is distributed while passing through the exhaust gas distribution plate 3 . The exhaust gas distribution plate 3 is arranged so that the inflowing exhaust gas evenly contacts each deodorizing device in the first unit and reacts with odor molecules, ultraviolet rays, and chlorine dioxide in the shortest possible time to maximize the deodorizing effect.

The exhaust gas passing through the exhaust gas distribution plate 3 passes through a plurality of UV lamps 4, titanium oxide catalyst plate 5, and chlorine dioxide precursor plate 6 that generate chlorine dioxide, thereby removing odor molecules and removing odor molecules while sufficiently reacting with chlorine dioxide adsorbed on the adsorbent 7.

Exhaust gas passing through the first unit flows into the second unit made of honeycomb-shaped activated carbon 8 mixed with hopcalite, a compound of manganese oxide and copper oxide, which is a catalyst for removing ozone. The second unit is branched from the rear end of the first unit, and two second units are installed in a doubly manner. The double installed second units alternately control exhaust gas to flow into one second unit. In the honeycomb-shaped activated carbon 8, odor molecules are additionally removed and residual ozone is also removed.

Exhaust gas that has passed through the honeycomb-shaped activated carbon is discharged to the outside through an exhaust gas outlet (9).

Photos of the exhaust gas distribution plate 3 are shown in FIG. 4, photos of the UV lamp 4 are shown in FIGS. 5A and 5B, photos of the titanium oxide catalyst plate 5 are shown in FIGS. 6A and 6B, and photos of the honeycomb activated carbon 8 are shown in FIGS. 7A, 7B, 8A, and 8B. 9 is a photograph of chlorine dioxide adsorbed on silica gel.

<Example 2>

One embodiment of the UV lamp and lamp ballast used in the present invention will be described.

As a UV lamp, a wavelength of 185 to 254 nm, a length of 770 mm, and a power of 150 W are used. Parts and materials of the UV lamp are shown in Table 2 below.

UV lamp parts Materials glass tube ozone quartz glass filament F-09233 external wire Molybdenum induction rod internal shielding gas inert gas lamp support ceramic mercury liquid mercury

As the material of the lamp, high-performance quartz is used to increase the penetration of ultraviolet rays, and a convenient and safe ceramic lamp support is used.

The environmental conditions for operating the lamp are as follows.

(1) Operating temperature: 0 to 50℃, operating humidity: 20 to 90% (no water drop ice)

(2) Storage temperature: 0~70℃, storage humidity: 85% or less (water drop ice does not occur)

The specifications of the UV lamp are shown in FIG. 10, and the performance of the lamp is shown in Table 3 below.

turn item code performance value unit deviation range One light tube power PL 150 W ±15% 2 lamp tube voltage UL 200 V ±30% 3 lamp current IL 800 mA 4 185nm irradiation intensity, distance 1m 450 ㎼/cm ² 5 ozone concentration 220 ppm 6 Beam stabilization time T 15 min 7 life expectancy H 8,000 hr

The specifications of the UV lamp ballast (150W) are shown in FIG. 11, and the performance of the ballast is shown in Table 4 below.

form Input Power(W) Input Current(A) Power/Lamp Lamp Current(A) PH6-800-150W 95-167 max.0.65-230 95-155 0.75~0.85 AC Source: 198~264V Mains. Frequency: 50/60Hz
Power Factor: >0.99 typ. Efficiency: >90% typ.
Operating Frequency: 40-50KHz Dimensions: 200*62*28m

<Example 3>

Preparation of catalyst for ozone removal

Hopcalite (CuMnO _x ), a composite of manganese oxide and copper oxide, which is a catalyst for removing ozone, was prepared as follows.

24.2 g of copper(II) nitrate trihydrate (from Daejeong) and 14.7 g of manganese(II) acetate (from Daejeong) were dissolved in 100 ml of water. This aqueous solution was slowly added dropwise to 50 ml of an aqueous solution in which 19.0 g of Potassium Permangante (KMnO ₄ , Potassium Permangante) was dissolved at room temperature while stirring at a speed of 350 rpm. The resulting suspension was stirred continuously at 25° C. for 24 hours.

The solid was filtered, washed with water, and dried at 100° C. for 12 hours to obtain hopcalite (CuMnO _x ) as a brown solid.

<Experimental Example 1>

Evaluation of odor removal efficacy of the first unit

The odor removal efficiency of the sewage sludge plant storage facility using the first unit of the odor removal system of the present invention was evaluated as follows.

The test site was Buryeong Industry Co., Ltd. (120 Hacheong-ro, Baeksan-myeon, Buan-gun, Jeonbuk), and the test was conducted from July 8 to July 19, 2021. The exhaust gas wind speed was 1.4 m/sec, the air volume was 300 Lube/min, and the temperature was 25 to 30°C.

Only the first unit of the odor removal system manufactured in Example 1 was used as the first unit to be evaluated. The experiment was commissioned by Blue Engineering Co., Ltd., and the amount of odor was evaluated by an air dilution sensory method.

In an experiment to measure the odor removal effect using the first unit of the odor removal system of the present invention, the result of measuring the odor at the inlet of the system is shown in FIG. 12, and the result of measuring the odor at the system outlet is shown in FIG. 13. The results are also shown in Table 5 below.

measuring position complex odor note system inlet 2,080 Air dilution sensory method (ES 09301.b) system exit 449 Air dilution sensory method (ES 09301.b)

As shown in the results of Table 5, it can be seen that even when only the first unit was used, the odor of the exhaust gas introduced into the system inlet was significantly reduced from 2,080 to 449 when discharged to the system outlet.

<Experimental Example 2>

Evaluation of odor removal efficacy of odor removal system

The odor removal effect of the sewage sludge plant storage facility using the odor removal system of the present invention was evaluated as follows.

The test site was Buryeong Industry Co., Ltd. (120 Hacheong-ro, Baeksan-myeon, Buan-gun, Jeonbuk), and the test was conducted from July 8 to July 19, 2021. The exhaust gas wind speed was 1.4 m/sec, the air volume was 300 Lube/min, and the temperature was 25 to 30°C.

The odor removal system prepared in Example 1 was used as the odor removal system to be evaluated. The experiment was commissioned by Blue Engineering Co., Ltd., and the amount of odor was evaluated by an air dilution sensory method.

In an experiment to measure the odor removal effect using the odor removal system of the present invention, the result of measuring the odor at the inlet of the system is shown in FIG. 14 and the result of measuring the odor at the outlet of the system is shown in FIG. 15 . In addition, the results are shown in Table 6 below.

measuring position complex odor note system inlet 2,080 Air dilution sensory method (ES 09301.b) system exit 173 Air dilution sensory method (ES 09301.b)

As shown in the results of Table 6, when the malodor removal system of the present invention was used, it can be confirmed that the odor of the exhaust gas introduced into the system inlet was significantly lowered from 2,080 to 173 when discharged to the system outlet.

In addition, even when compared with the results of Experimental Example 1 in which only the first unit was used, it was confirmed that the addition of the second unit greatly increased the odor removal effect and at the same time removed residual ozone, thereby removing interference with the deodorization effect due to residual ozone.

1: Exhaust gas inlet
2 : filter
3: exhaust gas distribution plate
4: UV lamp
5: titanium oxide catalyst plate
6: chlorine dioxide precursor plate
7: adsorbent
8: Honeycomb activated carbon mixed with ozone removal catalyst
9: Exhaust gas outlet
10: 1st unit (UV + chlorine dioxide box)
20: 2nd unit (carbon box)

Claims (12)

A chlorine dioxide precursor layer generating chlorine dioxide by ultraviolet irradiation; a UV lamp layer disposed on the front or rear surface of the chlorine dioxide precursor layer to irradiate ultraviolet rays; A first unit including a titanium oxide photocatalyst layer disposed on the front or rear surface of the UV lamp layer and an adsorbent layer disposed on the rear surface of the chlorine dioxide precursor layer to adsorb chlorine dioxide;
A malodor removal system comprising a second unit including an activated carbon box containing an ozone removal catalyst and activated carbon and installed at a rear end of the first unit. According to claim 1,
The odor removal system, characterized in that the chlorine dioxide precursor layer comprises at least one selected from the group consisting of sodium chlorite, a mixture of sodium chlorite and organic acid, and persulfate. According to claim 1,
The malodor removal system, characterized in that the chlorine dioxide precursor layer comprises potassium persulfate. According to claim 1,
The odor removal system, characterized in that the adsorbent layer comprises zeolite or silica gel. According to claim 1,
The odor removal system, characterized in that the catalyst for removing ozone comprises hopcalite (CuMnO _x ), which is a complex of manganese oxide and copper oxide. According to claim 5,
The activated carbon box contains the activated carbon and the ozone removal catalyst in a weight ratio of 90 to 95:5 to 10. According to claim 1 or 6,
The odor removal system, characterized in that the activated carbon box has a honeycomb shape. According to claim 1,
The odor removal system, characterized in that the second unit is installed in plurality at the rear end of the first unit. According to claim 8,
The odor removal system, characterized in that the second unit is dually installed at the rear end of the first unit in a branched form. oxidizing malodorous molecules with chlorine dioxide generated by irradiation of ultraviolet rays by a UV lamp;
Adsorbing the chlorine dioxide on an adsorbent layer to react the adsorbed chlorine dioxide with odor molecules;
Physically and chemically removing malodorous molecules by reacting with radicals and ozone generated by a UV lamp and a titanium oxide photocatalyst;
physically removing malodorous molecules by adsorbing them to activated carbon; and
and removing residual ozone remaining after reacting with the odor molecules by using an ozone removal catalyst. According to claim 10,
Chlorine dioxide generated by ultraviolet irradiation of the UV lamp,
An odor removal method characterized by generating chlorine dioxide by irradiating ultraviolet rays to a chlorine dioxide precursor layer containing at least one selected from the group consisting of sodium chlorite, a mixture of sodium chlorite and an organic acid, and a persulfate. According to claim 10 or 11,
The odor removal method, characterized in that the activated carbon and the catalyst for removing ozone are mixed in a weight ratio of 90 to 95:5 to 10 to form a honeycomb-shaped activated carbon box.