KR100919631B1 - Iodine gas generating composition for purification of injurious gas and an injurious gas purificating apparatus using the composition - Google Patents

Abstract

The present invention relates to an apparatus for purifying harmful gases containing volatile organic substances and purifying harmful gases that cause odors. The present invention relates to an activity in which iodine is deposited by a fan to pass harmful gases from a source of harmful gases to a target to be treated. A toxic gas purifying apparatus for disposing and discharging harmful components by disposing at least one unit provided with carbon and straw fragment pieces of additional catalyst components according to harmful components in a harmful gas flow path, wherein It contains 10-320 parts by weight of iodine, 10-450 parts by weight of KI, and 500-4000 parts by weight of water for iodine gas generation to continuously generate iodine gas to supply gas automatically. Including an iodine gas generator provided, so that a separate ozone generator or Iodine gas can be automatically and continuously supplied to the harmful gas stream without using a device such as an ultraviolet lamp to efficiently decompose harmful components, and the device can be compactly installed and operation cost can be reduced. have.

Description

Iodine gas generation composition for toxic gas purification and apparatus for purifying harmful gas using the composition TECHNICAL FIELD

 The present invention relates to a method and apparatus for purifying harmful gas, and in particular, to process and purify the noxious gas containing noxious and odor generating components of the volatile organic rotor generated in a wastewater treatment plant and a plant by an efficient electrochemical oxidation method. A method and apparatus are disclosed.

In general, volatile organics are emitted not only from waste water and waste treatment plants, but also from printing facilities, dyeing facilities, leather facilities and petrochemical facilities, which are more strictly regulated by laws and regulations due to their odor and harmfulness. have.

In particular, among toxic gases, volatile organic compounds (VOCs), which are inevitably generated in various processes such as production processes, waste treatment processes, and coating processes that use a large amount of various organic solvents, cause photochemical oxidation reactions. It is a substance that causes serious pollution problems. Examples of such volatile organics include ethanol, cyclopentane, benzene, toluene, ethylbenzene, hexane, hydrogensulfide, ammonia, amine, xylene, methylethylketone, ethylbenzene, styrene, acetaldehyde and the like.

Conventional techniques for removing such harmful VOCs gas include a combustion method for burning VOCs gas, an adsorption method using activated carbon, a microorganism filtration method, and a plasma method for decomposing VOCs gas using plasma.

In addition, in addition to the volatile organics generated in industrial facilities, odor generating volatile organics in a hot or humid state or a dried state are discharged in a gaseous state in a food waste treatment apparatus or sludge drying process. In general, hydrogen sulfide and ammonia are produced in the protein decomposition of bacteria or occur in nature or in kraft pulp mills, starch mills, cellophane mills, rayon mills, crematoriums, fish-embedding plants, feather processing plants, waste disposal plants, manure treatment plants and sewage treatment plants. Odor gases such as gas are generated, especially hydrogen sulfide smells like rotten eggs.

These odors cause symptoms such as loss of appetite, vomiting, insomnia, and allergies, and psychologically irritating and risk of falling into neuroses. The emission standard of hydrogen sulfide is 30ppm according to the Environmental Conservation Act and 10ppm in the Industrial Safety and Health Act.

Various methods for removing such odors and harmful volatile organic substances have been proposed. Among them, air disclosed in Korean Patent Publication No. 10-0442703, catalyst mixture for water purification, and air using the catalyst mixture, water quality As shown in FIG. 1, the catalyst mixture 1a of the catalyst filter unit 1 composed of 80 to 90% by weight of carbon, 5 to 10% by weight of iodine, and 5 to 10% by weight of magnesium may be used. The air is first purified by removing various organic substances and ozone from the outside contaminated air introduced by the electrode 4a while being electrolyzed by the electrode 1b, and the air passing through the catalyst filter 1 is high pressure. Ozone and anode generated by high voltage while passing through the dust collecting and ozone generating unit (2)

2a) and the catalyst mixture (2aa) (2ba) of the catalyst mixture molded body attached to the cathode (2b) to remove the harmful gas introduced in the undecomposed state in the catalyst filter unit 1 and various fine dusts in the air Dust is collected and removed, and the air passing through the high pressure dust collecting unit and the ozone generating unit 2 passes through the gas purifying unit 3 and gaseous iodine penetrates into the wall.

By colliding with the straw flakes 3a in a state, molecular vibrations are carried out in a physical manner to decompose and purify harmful gases contained in the air, and at the same time, the protein is decomposed by the gaseous iodine penetrated into the straw flakes 3a. The air passing through the gas purifying part 3 passes through the third purifying air supply part 4 and purifies in the third step while the third purified air comes into contact with the water in the water tank 5 while passing through the third purifying air supply part 4. After the ozone, dust or other substances remaining in the air is removed, the fourth purified air is discharged to the outside through the exhaust hole 12ba.

As another example, Korean Patent Laid-Open Publication No. 2003-0085756 discloses an apparatus for purifying harmful gas and condensate, and the apparatus for purifying the primary gas is provided from the upper side as shown in FIGS. 2 and 3. ), Primary gas purification, proteolysis and condensation unit 2 for performing purification and condensation of noxious gases, primary gas / condensate purification unit 3, and secondary gas receiving unit 5 ), A first purifier (A) consisting of a secondary gas / condensate purification unit (6), a primary purified condensate storage unit (7), a condensate storage unit (8), secondary purified from the lower side, Tertiary gas / condensate purification unit 9, ionized air receiving unit 10, secondary gas purification, proteolysis and condensation unit 11, quaternary gas / condensate purification unit 12, and A second purifying device (B) consisting of a gas purifying unit (13), an iodine gas supply unit (16), an ionized air supply unit (25), suction of hot and humid gas, and discharge means of the final purified gas In-blower (19), the catalyst mixture is installed inside was used in a blending ratio of 80 to 90% by weight, 5 to 10% by weight of iodine, 5 to 10% by weight of magnesium for each component.

However, the above-described prior art purifiers are composed of two independent hazardous gas purifiers and a condensate purifier, and include an iodine gas supply device, an ionized air supply unit (ozone generator), and an ultraviolet lamp of a final gas treatment unit. There is a problem in that the installation of the device is complicated, the installation cost, the operation and maintenance costs are excessive and the occupied area is large, which causes a large burden on the economically small businesses.

In addition, when the volatile organic compounds (VOCs) are treated, there is a problem that the increase and decrease of the fine dust and adhesive material generated in the conventional catalyst type decreases the decomposition function of the catalyst, thereby reducing the odor removal efficiency and shortening the service life.

An object of the present invention is to solve the problems according to the conventional hazardous gas treatment method and apparatus, iodine gas generation composition for harmful gas treatment to perform more efficient harmful gas treatment even with a smaller scale harmful gas treatment device To provide.

Another object of the present invention is to provide an improved toxic gas treatment apparatus using iodine gas generating composition to automatically supply iodine gas to the flow of harmful gases and to simplify the process of treating harmful gases.

In order to achieve the above object, according to the present invention, in order to continuously generate iodine gas in the iodine gas generator provided on the harmful gas inlet side of the toxic gas purification device to supply iodine gas for harmful gas decomposition treatment. An iodine gas generating composition for toxic gas purification comprising 320 parts by weight, KI 10-450 parts by weight and water 500-4000 parts by weight is provided.

The harmful gas purifying apparatus according to the present invention includes at least a straw piece of activated carbon in which iodine is deposited such that a harmful gas of a target to be treated containing harmful components is passed from a source of harmful gases by a fan, and additional catalyst components according to the harmful components. In a noxious gas purification device in which a unit is disposed in a noxious gas flow path to decompose and discharge noxious components, the air volume and residence time of noxious gas containing L0.3 × W0.36 × H0.3 m ³ ( RT) Based on 0.972 sec, the deposition of iodine on the activated carbon consists of 20-350 parts of iodine, 25-550 parts of potassium iodide (KI) and 800-1600 parts of water by weight, based on 25000 parts by weight of activated carbon. It is comprised by depositing with aqueous solution.

The unit includes the first transition elements of Ni, V, Cr, Mn, Fe, Co, Cu, and Mo, Zr, Nb, Tc, Ru, Rh, Pd and Ag depending on the harmful gas component together with iodine-deposited activated carbon. Straw pieces formed of the second transition elements of and at least one element selected from among the third transition elements of Hf, Ta, W, Re, Os, Ir, Pt, and Au may be provided.

The unit includes 650-1,230 parts of Cr, 550-1,700 parts, Mn 480-1,350 parts, Fe 630-1,500 parts, Cu 450-1,100 parts, Zr, by weight of 25,000 parts of activated carbon, together with iodine deposited activated carbon. It is preferable to provide straw pieces which form at least one selected from 700-1600 parts, Mo 630-1480 parts, Ru 540-1390 parts, Pd 550-1,420 parts, and Pt 500-800 parts as additional catalyst components.

In the present invention, the iodine gas generator is installed so that the inlet pipe and the discharge pipe are disposed in the harmful gas flow path so that the iodine gas is automatically mixed with the incoming harmful gas stream at the inlet side of the harmful gas inlet, and the iodine gas generator has a weight Preferably, an aqueous solution of 10-320 parts of iodine and 500-4000 parts of KI 10-450 parts is provided.

In addition, the unit is uniformly filled with activated carbon on which iodine and KI are deposited between two plate-shaped or mesh-like porous bodies of conductive material, and straw pieces of at least one additional catalytic component. Low voltage DC power supply of 2-12V is applied.

Hazardous gas purifying apparatus according to the present invention can efficiently decompose harmful components by continuously supplying iodine gas to the flow of harmful gas continuously without using a device such as a separate ozone generator or ultraviolet lamp, the device is compact It can be installed easily, and the operation cost can be reduced.

1 is a block diagram of a conventional harmful gas purification device.

Figure 2 is a schematic perspective view of another conventional harmful gas purification device.

3 is a block diagram of the purification device of FIG.

Figure 4 is a schematic cross-sectional view of a unit for a noxious gas purification apparatus, containing a piece of straw with activated carbon and other catalyst components deposited thereon the catalyst mixture according to the present invention.

5 is a schematic configuration diagram of a harmful gas purification apparatus according to the present invention.

FIG. 6 is a schematic diagram illustrating a configuration of the iodine gas generator of FIG. 5. FIG.

Explanation of symbols on the main parts of the drawings

  100: unit 101: porous body

  105: activated carbon 106: straw fragment

  125: iodine gas generator

Hereinafter, the present invention will be described in more detail with reference to examples according to the present invention.

In general, an electrochemical oxidation mechanism that oxidizes volatile organic substances (VOCs) causes electron acceptors (A) to act on volatile organics to form charge transfer complexes of electron donor structures, By inducing the electrochemical oxidation reaction by decomposing volatile organic substances in a harmless state.

For example, the oxidation mechanism of toluene is as follows.

Toluene forms a charge transfer complex with the electron acceptor (A), and moisture is decomposed into hydrogen ions and hydroxyl ions at the + and-electrodes.

C ₇ H ₈ + A ⇔ ^{δ +} C ₇ H ₈ -A ^δ-

^{_{8H 2 O ⇔ 8H + + 8OH}} -

The oxidation reaction of the oxidizing agent (M ^{(m + n) +} ) occurs at the + electrode that sucks electrons.

_{^{8OH - + δ + C 7 H}} 8 -A δ- → 7C + 8H 2 O + A + 8e -

_{^{M m + + xH 2 O →}} M (m + n) + O x 2X - + 2xH + + ne -

In the electrode-which provides electrons-the catalysis of oxidant causes the following reduction reaction.

M ^{(m + n) +} _x O ^{2X -} + 2xH ⁺ + ne ^- → M + xH ₂ O ^{+ m}

8H ^{+ +} 8e ^- → 4H ₂

As a result, the electron acceptor A and the oxidizing agent M ^{(m + n) +} continue to circulate as catalysts and remain in the reaction vessel, so toluene itself in the oxidation reaction decomposes in a harmless state as follows.

C ₇ H ₈ → 7C + 4H ₂

According to the present invention, in addition to providing iodine in a gaseous state as an electron acceptor in the electrochemical reaction, an aqueous solution of iodine, potassium iodide, and water is deposited on activated carbon to react with harmful gas components to be ionized. The aqueous solution of iodine is 20-350 parts of iodine and potassium iodide (KI) by weight part when the volume of air containing noxious gas and the residence time (RT) of L0.3 × W0.36 × H0.3 m ³ are set to 0.972 sec. It is preferable to deposit and use 25,000 parts of activated carbon as an aqueous solution which consists of -550 parts and 800-1600 parts of water.

In addition, according to the present invention, the iodine deposited on the activated carbon may be used as a base catalyst, and the following catalyst components may be added according to harmful gas components. Such additional catalyst components include first transition elements of Ni, V, Cr, Mn, Fe, Co, Cu, second transition elements of Mo, Zr, Nb, Tc, Ru, Rh, Pd and Ag, At least one element selected from the third transition elements of Hf, Ta, W, Re, Os, Ir, Pt, and Au is formed or supported by a straw piece.

In particular, the additional catalyst component is Ni 650-1,230 parts, Cr 550-1,700 parts, Mn 480-1,350 parts, Fe 630-1,500 parts, Cu 450-1,100 parts, Zr 700-1,600 parts by weight based on 25,000 parts of the activated carbon. At least one selected from proportions of Mo, 630-1480 parts, Ru 540-1390 parts, Pd 550-1,420 parts, and Pt 500-800 parts in the form of straw fragments Preference is given to using the compound for decomposition. In addition, the straw piece may be used by adding an alkali metal to 50 to 75% by weight. The additional catalyst component is selected according to the constituents of the noxious gas, for example, Ni, Cu, Pd, Pt for the treatment of ammonia or amine-based components, Ni, Cu, Pd, Fe, for the treatment of VOCs containing toluene Mn and Pt are selected.

4 schematically shows a unit 100 for use in a noxious gas treatment system using the iodine and additional catalysts described above in accordance with the present invention. The unit 100 comprises an activated carbon 105 in which iodine, KI is deposited in an aqueous solution state between two plate-like porous bodies 101 made of a conductive material, and optionally at least one additional catalyst component. Straw pieces 106 formed of the filling is configured.

An apparatus for treating harmful gas using the unit 100 containing the catalyst as described above is schematically illustrated in FIG. 5.

Reference numeral 110 is a source of harmful gas generated from a waste disposal plant or a factory, and the harmful gas generated therefrom is connected to the rear of the fan 121 installed at the rear of the noxious gas purification apparatus 120 according to the present invention through the harmful gas transfer pipe 111. It is introduced into the harmful gas purification device by driving.

The purifier 120 has an iodine gas generator 125 as shown in Figure 6 on the side of the harmful gas inlet, the inlet pipe 126 and the discharge pipe 127 is introduced into the purifier, respectively, Disposed at the front and the rear of the harmful gas flow path. The iodine gas generator contains an aqueous solution in which 10 to 320 parts of iodine and 10 to 450 parts of KI are dissolved in 500 to 4000 parts of water.

The iodine of the iodine gas generator has not been efficiently generated due to the condensed water due to the moisture and the temperature difference contained in the inlet gas due to the nature of the soluble in water when the iodine in the existing solid state. However, according to the present invention, an aqueous potassium iodide solution is prepared using potassium iodide (KI), which is soluble in water, and an iodine solid is added thereto to make an iodide-potassium iodide solution using potassium iodide as a solvent.

That is, from KI + I ₂ → KI3

I ₂ + I ^- I ₃ ^- --- (a)

This reaction is reversible and I ₃ ⁻ dissociates into a reverse reaction as I ₂ is consumed, making it possible to use it as an I 2 solution. By encountering some other ion and losing or gaining electrons, the following reaction can proceed.

I ₂ + 2e ^- 2I ^-

In other words, I ^- and I ₂ to precipitate a oxidizes I ₃ ^- is able (a) the reaction can be used as I ₂ solution, so a reverse reaction proceeds dissociates according to the I ₂ doeeojim consumption. Thus, by using the iodine-potassium iodide solution to solve the problem of the generation of iodine gas by the water or condensate in the inlet air, it was possible to continuously supply the iodine gas. Likewise, by using iodine-potassium iodide solution on activated carbon, iodine participates in the electrochemical oxidation of harmful gases, causing harmful components to decompose.

In this way, the iodine gas generated from the iodine gas generator is diffused while being mixed with the harmful gas flowing from the inlet pipe and flowing into the discharge pipe, and automatically diffused into the purification device without using a pump or the like as in the conventional purification device. Mixes evenly with harmful gases. The iodine gas generator 125 is also provided with a branch pipe 127 and an inlet 128 which are branched to the outside to form a transparent window in order to check the water level of the iodine aqueous solution from the outside and to replenish as necessary.

As described above, the harmful gas in which the iodine gas is mixed is decomposed by the electrochemical oxidation reaction by the catalyst such as activated carbon 105 and iodine, straw flakes 106, etc. adhered to the activated carbon. .

A plurality of units 100 containing the straw pieces 106 of at least two catalyst components are disposed spaced apart from the harmful gas flow path in the noxious gas purification apparatus, wherein iodine is adhered according to the components of the noxious gas to be treated. Only one unit containing only activated carbon 105 may be used, and a plurality of units with the above-described activated carbon having iodine and KI deposited on the straw pieces 106 attached to at least one catalytic ingredient further selected according to the harmful component to be treated. Divided and accommodated in the (100, 100 ', 100 ") can be installed and used spaced apart as schematically shown in FIG.

In addition, it is preferable to remove the foreign substances mixed in the harmful gas introduced into the purification apparatus 120 in advance, and for this purpose, it is preferable to arrange the pretreatment filter unit 102 at the front side of the introduced harmful gas flow. The pretreatment filter of the unit 102 filters out foreign substances introduced into the purification device. Otherwise, foreign matters may accumulate on the surface of activated carbon, and the reaction between KI, iodine and volatile organic substances deposited on the activated carbon may not be smooth, and the efficiency of harmful air purification is reduced. Therefore, the lowering of the purification efficiency is prevented and the electrochemical reaction by the catalyst is efficiently performed.

The units 101, 101 ', 101 " and 102 are all in the form of cartridges, which are preferably detachably installed in the purifying apparatus 120. [0033] In FIG. As the condensate discharge pipe for discharging the condensate condensed with the water contained therein while passing through the unit, such condensate is preferably purified by a separate purifier.

As such, the iodine and the additional catalyst components supplied in the gaseous state to the noxious gas stream act as electron acceptors (A) in the above-described oxidation mechanism to form charge transfer complexes with volatile organics. The electrochemical reaction by the catalyst is performed smoothly.

In FIG. 5, the harmful gas transferred to the purification apparatus 120 through the harmful gas transfer pipe 111 is mixed with iodine gas and first passes through the pretreatment filter unit 102 while dust, foreign matter, moisture, and the like are applied to the filter. And then pass through the units (100, 100'100 ") sequentially, while passing through the plate-shaped porous bodies (101) on both sides of each unit, the porous bodies are connected to a low voltage DC power source of 2-12 V. Therefore, the harmful gas component passing through the porous body and the additional catalyst component attached to the iodine and straw pieces 106 of the activated carbon 105 are converted into a non-hazardous gas component by the electrochemical reaction and discharged.

In the present invention, the porous body is preferably a plate-shaped porous plate or a mesh-shaped porous network in which holes are formed such that activated carbon or strobe pieces do not escape while allowing a smooth flow of gas, and the porous body is formed of an electrically conductive material to directly apply power. The porous body may be formed of a non-conductive material and an electrode plate may be disposed inside the porous body.

It is preferable to use the activated carbon as defined in the activated carbon industry standard, and the carbon supplied in the form of such activated carbon increases the flow of current as the compounding ratio increases, so that the performance of the catalytic reaction increases, There is a risk of fire due to the low carbon compounding ratio, and the compounding ratio of the activated carbon and the catalyst component may be reduced because harmful components of the harmful gas passing through the unit may be released into the atmosphere without being sufficiently decomposed. It should be chosen appropriately in consideration.

In the conventional apparatus, the iodine gas is directly injected, but this method does not facilitate the electrochemical oxidation reaction of the catalyst due to the moisture contained in the noxious gas. There was a problem that the components can be discharged in the unprocessed state, so that the odor removal is not processed, the iodine gas in the gas state by the iodine gas generator 125 provided on the inlet side of the harmful gas in the purifier 120 according to the present invention. Harmful and odor generating components of hazardous gases are almost completely eliminated by iodine deposited on activated carbon contained in the unit (100, 100 ', 100 "), while automatically and continuously mixing harmful gases into the harmful gas stream. .

According to the present invention, the iodine-potassium iodide of activated carbon 105 acts as an oxidizing agent for the electrochemical oxidation of volatile organics, resulting in volatile organic decomposition.

The action of iodine and KI is composed of a conventionally separate set of devices in the iodine gas generator of the purifier according to the present invention, instead of adding iodine, the iodine in solid state is put together with KI in water and collectively added as described above. Cost savings in device construction and smooth supply of iodine gas to the catalyst.

Tables 1 and 2 below show the test results for benzene and toluene as hazardous gas components to be removed by the purifier according to the present invention, respectively, wherein the units of the purifier include 180 g of iodine, KI 415 g, and 1000 g of water. While depositing 25 kg of activated carbon as an aqueous solution, the straw pieces were made of Ni 550g, Mn 200g, Pd 640g, Pt 200g, Cu 450g, and Fe 700g. The concentration of the outlet after 5 minutes, 25 minutes, 50 minutes and 75 minutes was measured by testing the concentration of the inlet of the harmful components.

Table 1

* benzene RT  One. ppm Inlet concentration Hourly measurement conduct concentration Average Removal efficiency 5 minutes 25 minutes 50 minutes 75 minutes 112 3.36 3.52 3.48 3.31 3.42 96.9% 223 6.82 6.89 6.83 6.76 6.83 96.9% 252 6.84 6.92 6.89 6.78 6.86 97.3% 390 11.87 11.93 11.83 11.72 11.84 97.0%

TABLE 2

* toluene RT  One. ppm Inlet concentration Hourly measurement conduct concentration Average Removal efficiency 5 minutes 25 minutes 50 minutes 75 minutes 153 5.23 5.35 5.3 5.21 5.27 96.6% 248 9.74 9.79 9.62 9.58 9.68 96.1% 275 10.54 10.57 10.5 10.48 10.52 96.2% 337 11.62 11.7 11.63 11.55 11.63 96.6%

As can be seen above, by showing a removal efficiency of more than 96% for benzene and toluene, one of the representative harmful components in the purifier according to the present invention showed that the apparatus of the present invention is very effective in removing harmful gases.

According to the present invention, in the conventional apparatus, the purifying action of the noxious gas by the catalyst using high-pressure direct current electricity is not sufficient, and the volatile organic matter is decomposed by ultraviolet rays irradiated by ozone or ultraviolet lamp supplied by the ozone supply device. However, in the present invention, iodine gas is smoothly supplied, low voltage power supply is used, and the amount of volatile organic matter is not used without using an ozone supply device and an iodo gas input device, etc. as an adjustment of the mixing ratio of the catalyst. Decomposition effect can be obtained, and the size of the purification device can be reduced, manufacturing cost can be reduced, and operation cost can be reduced.

According to the present invention, the iodine gas, which is continuously supplied to the harmful gas stream in the iodine gas generator, and harmful substances including volatile organic matter in at least one unit including the activated carbon and the straw flake fragment of the catalytic component in which an aqueous solution of iodine and KI is deposited. By decomposing the gas by electrochemical oxidation, it is possible to efficiently purify the harmful gas, and it is possible to efficiently process volatile organic matter without using an ultraviolet lamp, an ozone generator, or a high voltage current in a conventional purifier. The configuration can be simplified to reduce manufacturing costs, and high voltages can be used to reduce operating costs.

Claims (8)

delete Accommodate an iodine gas generating composition for toxic gas purification to continuously generate iodine gas so as to automatically supply iodine gas for harmful gas decomposition treatment so that a harmful gas of the target object containing harmful components passes from the source of harmful gas by a fan. An iodine gas generator is provided on the side of the harmful gas inlet, and at least one unit provided with a straw fragment of activated carbon having iodine deposited thereon and an additional catalyst component according to the harmful component is disposed in the harmful gas flow path to decompose and discharge the harmful component. In a noxious gas purification device  The unit 100, which is provided to the flow path of the noxious gas in the purification device, comprises an activated carbon 105 in which iodine and KI are deposited between two porous bodies 101 made of a conductive material, and at least one additional catalyst component. Straw piece 106 is uniformly charged, the porous body 101 is a harmful gas purification device, characterized in that the DC power of 2-12V is applied. The iodine deposition on the activated carbon provided in the unit according to claim 2, based on a nominal gas-containing air volume of L0.3 × W0.3 × H0.3 m ³ and a residence time (RT) 0.972 sec. A harmful gas purifier, characterized in that the deposition by the aqueous solution consisting of 20 to 350 parts by weight of iodine, 25 to 550 parts of potassium iodide (KI) and 800-1600 parts of water with respect to 25000 parts by weight of activated carbon. 4. The unit of claim 3, wherein the unit includes first transition elements of Ni, V, Cr, Mn, Fe, Co, Cu, and Mo, Zr, Nb, and Tc depending on toxic gas components together with iodine and KI deposited activated carbon. Provided with a second transition element of Ru, Rh, Pd and Ag and at least one element selected from among the third transition elements of Hf, Ta, W, Re, Os, Ir, Pt and Au Toxic gas purification apparatus, characterized in that. The method according to claim 3, wherein the additional catalyst component is Ni 650-1,230 parts, Cr 550-1,700 parts, Mn 480-1,350 parts, Fe 630-1,500 parts, Cu 450-1,100 parts by weight based on 25,000 parts by weight of the activated carbon. At least one selected from Zr 700-1,600 parts, Mo 630-1480 parts, Ru 540-1390 parts, Pd 550-1,420 parts, and Pt 500-800 parts. delete 6. The iodine gas generator (125) according to any one of claims 2 to 5, wherein the iodine gas generator (125) and the discharge pipe are configured to automatically mix the iodine gas with the incoming harmful gas stream at the inlet side through which the harmful gas is introduced. Noxious gas purification device, characterized in that 127 is installed to be disposed in the noxious gas flow path. The branch pipe 127 according to any one of claims 2 to 5, wherein the iodine gas generator 125 branches to the outside of the noxious gas purification device so as to check and replenish the water level of the iodine aqueous solution from the outside. ) And an injection hole 128 is characterized in that the harmful gas purification device.