JP2003103137A - Deodorization method and apparatus for the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and apparatus for stably and surely performing a deodorization treatment of malodoruos gas. SOLUTION: One embodiment of the invention relations to the deodorization method for the malodoruos gas comprising preparing a bromine-base oxidizing agent by electrolyzing an aqueous solution of a bromine compound and bringing the liquid containing the prepared bromine-base oxidizing agent into contact with the malodoruos gas. This invention further relates to the deodorization apparatus for the malodoruos gas including an electrolysis equipment for preparing the bromine-base oxidizing agent by electrolyzing an aqueous solution of the bromine compound and a treatment equipment for bringing the liquid containing the prepared bromine-base oxidizing agent into contact with the malodoruos gas in the electrolysis equipment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an odor generated during the treatment or storage of wastewater such as sewage, sewage, human waste, industrial wastewater, or organic matter such as sludge or garbage generated during the treatment of wastewater. Storage of radioactive waste or treatment such as dehydration
The present invention relates to a method and a device for deodorizing odor generated during disposal.

[0002]

2. Description of the Related Art Wastewater such as sewage, sewage, human waste, industrial wastewater, etc. is treated or stored, or organic waste such as organic sludge and garbage generated during wastewater treatment is stored or dehydrated. A foul-smelling gas is generated during the treatment / disposal, and therefore, in these facilities, it is very important to improve the working environment, take environmental measures for the surrounding residents, and prevent corrosion of the equipment.

As a method for deodorizing such malodorous gas,
Up to now, the activated carbon adsorption method, the biological deodorization method, the chemical cleaning method using an acid or alkali, etc. have been put into practical use. The activated carbon adsorption method is a method in which an odor component is adsorbed on activated carbon having a large surface area and a large number of pores to deodorize. In this activated carbon adsorption method, impregnated activated carbon impregnated with an acid, an alkali or an oxidizing agent is also widely used. The activated carbon adsorption method can perform deodorization simply by passing a malodorous gas through the activated carbon layer,
Operability is good, but it can be applied only to low-concentration odorous components. In addition, there is a problem that the adsorption performance is deteriorated due to an increase in water content in the malodorous gas, or the activated carbon is frequently replaced when the odorous component has a high concentration, which affects workability and cost.

As a biological deodorizing method, a packed tower type deodorizing method in which a packing material to which microorganisms are adhered and a malodorous gas are brought into contact to deodorize is widely used. Although this method has a low deodorizing cost, in order to improve the deodorizing performance, it is necessary to lengthen the contact time between the filler and the malodorous gas, and the apparatus tends to be excessive. Further, although the deodorizing performance is determined by the amount of attached microorganisms, there is a disadvantage that the microorganisms cannot be immediately proliferated when a high-concentration odorous component flows in, so that it is not possible to immediately cope with the concentration variation of the odorous component.

In the chemical liquid cleaning method, a cleaning liquid containing an acid or an alkali and a malodorous gas are brought into contact with each other through a filler so that the odorous component in the malodorous gas is absorbed in the cleaning liquid or is oxidized and decomposed by a chemical in the cleaning liquid. Deodorization is carried out by means of which it is possible to control the injection of the drug concentration, and if a sufficient amount of drug can be supplied, it is possible to cope with a wide range of concentrations of the odorous components of malodorous gas
It is a versatile deodorizing method. Of the odorous components, ammonia and trimethylamine can be removed from the malodorous gas with a cleaning solution containing sulfuric acid. Further, a sulfur-based odor component such as hydrogen sulfide can be removed from the malodorous gas by oxidative decomposition with a mixed chemical of caustic soda and sodium hypochlorite.

However, sodium hypochlorite, which is a conventional liquid chlorine-based oxidizing agent, has a problem in long-term stability and is not suitable for long-term storage. Further, when the makeup water enters the deodorizing device, a part of the circulating liquid in an amount commensurate with the amount is blown out of the system. This blow water contains unreacted chemicals, resulting in waste of chemicals. Furthermore, if the malodorous gas concentration increases, it is difficult to maintain the deodorizing effect.

[0007]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and apparatus for overcoming the above-mentioned drawbacks of the conventional malodorous gas deodorizing method and stably and reliably performing malodorous gas deodorizing treatment. And

[0008]

In order to achieve the above object, the present invention provides a bromine-based oxidizer prepared by electrolyzing an aqueous solution of a bromine compound and preparing a solution containing the prepared bromine-based oxidizer. Provided is a method for deodorizing malodorous gas, which is characterized in that it is brought into contact with malodorous gas.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail below, but the present invention is not limited thereto.

The malodorous gas that can be deodorized by the present invention includes malodorous gas generated during the treatment and storage of wastewater such as sewage, sewage, human waste, industrial wastewater, and sludge generated during the treatment of such wastewater. Examples of the foul-smelling gas generated at the time of storage / dehydration treatment / disposal of organic waste such as food waste and raw garbage. According to the present invention, such malodorous components such as aldehydes, hydrogen sulfide, methyl mercaptan, methyl sulfide, and methyl disulfide in malodorous gas can be decomposed and removed.

The present invention is characterized in that an aqueous solution of a bromine compound is electrolyzed in an electrolytic device to prepare a bromine-based oxidizing agent. The main component of the bromine-based oxidizing agent prepared by this method is a bromine compound such as hypobromite, hypobromite ion, and hypobromite. However, the bromine-based oxidizing agent prepared by the present invention may contain an oxidizing substance related to halogen generated during electrolysis due to impurities in the bromine compound as a raw material or impurities from dissolved water. . Examples of the halogen compound other than bromine, which may be contained in the oxidizing agent according to the present invention, include hypochlorous acid, hypochlorite, hypochlorite ion, hypoiodic acid, hypoiodite, hypochlorite. For example, iodate ion. In addition, chlorine compounds such as sodium chloride, chlorine-based oxidizing agents such as hypochlorous acid, hypochlorite ion, hypochlorite obtained by electrolyzing from seawater, etc. It can also be included in the agent. These chlorine-based oxidants are inferior to the bromine-based oxidant according to the present invention in terms of reactivity, but by using the chlorine-based oxidant together, the oxidative effect of the bromine-based oxidant according to the present invention can be obtained. It can be increased. The chlorine compound produces chlorine, hypochlorous acid, hypochlorite, and the like by electrolysis, but these chlorine-based oxides do not adversely affect the effect of the oxidizing agent according to the present invention.

The conditions for electrolysis carried out to prepare the bromine-based oxidant according to the present invention are preferably a voltage of 5 to 20 V, a current density of 1 to 5 A / dm ² , and an electrode interval of 5 to 20 mm. Examples of the electrode material that can be used for electrolysis include carbon and platinum. Further, in the present invention, the electrolysis conditions can be arbitrarily changed depending on the electrolysis temperature, the concentration of the electrolytic solution, the size of the electrolyzer, and the like. By changing the electrolysis conditions in this way, the concentration of the brominated oxidant prepared can be controlled. Therefore, in the present invention, the addition ratio of the bromine-based oxidizer to the malodorous gas can be extremely easily and easily changed by appropriately changing the operating conditions of the electrolyzer, that is, the voltage and current density and the electrolyte concentration of the electrolyzer. It can be adjusted easily and quickly, and it is possible to immediately respond to changes in the odor component concentration of the malodorous gas and the drug concentration of the chemical liquid (circulating liquid).

In the present invention, as the bromine compound which can be subjected to electrolysis for the preparation of the bromine-based oxidant, sodium bromide, potassium bromide, magnesium bromide, ammonium bromide, hydrobromide water, etc. Water-soluble bromine compounds can be used. Also, a waste liquid containing a bromine compound can be used as a bromine compound for the preparation of the bromine-based oxidizing agent in the present invention.

In the present invention, the electrolytic solution to be electrolyzed for the preparation of the bromine-based oxidant may contain a bromine compound as a main component and a chlorine compound, sodium chloride or the like. Chlorine compounds produce chlorine, hypochlorous acid, and hypochlorite salts by electrolysis, but the chlorine-based compounds thus produced also have an adverse effect on the effect of the bromine-based oxidizing agent according to the present invention. Not something to give. this is,
This is because the bromine-based oxidizing agent according to the present invention is also produced by the reaction of unreacted bromine compound with chlorine, hypochlorous acid, or hypochlorite. In this case, there is no limitation on the mixing ratio of the bromine compound and the chlorine compound in the electrolytic solution.

In the present invention, the concentration of the bromine compound in the aqueous bromine compound solution that is subjected to electrolysis to prepare the bromine-based oxidizing agent is preferably about 1 to 20% by weight in terms of bromine equivalent. When the bromine equivalent concentration in the aqueous solution is 1% by weight or less, the electrolytic treatment efficiency is lowered, the concentration of the obtained bromine-based oxidizing agent is lowered, and the required amount of the oxidizing agent is increased during deodorization. On the other hand, if the bromine equivalent concentration is 20% by weight or more, scale trouble may occur inside the electrolytic device.

The pH of the aqueous bromine compound solution to be electrolyzed is preferably 8 or less, and if necessary, it is preferable to adjust the pH with a mineral acid such as sulfuric acid. In the present invention, the bromine-based oxidizing agent obtained by electrolysis of an aqueous solution of a bromine compound contains hypobromite, hypobromite ion, and hypobromite as oxidizing active ingredients.

The bromine-based oxidizing agent thus prepared is preferably brought into contact with a malodorous gas as a chemical solution having a concentration of 1 to 500 mg / L (chlorine conversion value). If the concentration of the oxidizing agent in the chemical solution is 1 mg / L or less, the deodorizing effect is low, and if it is 500 mg / L or more, the drug cost becomes a problem.

In the present invention, when the brominated oxidant prepared by electrolyzing an aqueous solution of a bromine compound is brought into contact with a malodorous gas, the prepared bromine oxidant is used as a chemical solution having the above-mentioned suitable concentration. It is preferable to contact the malodorous gas while circulating. The chemical liquid (circulating liquid) and the malodorous gas can be brought into contact with each other, for example, by causing the malodorous gas to flow through a column filled with the packing material to pass through the packing material and by spraying the chemical solution on the packing material.

In a preferred embodiment of the present invention, an aqueous solution of a bromine compound is electrolyzed at the on-site (site) of the malodorous gas deodorizing treatment to prepare a bromine-based oxidizing agent, which is immediately added to the circulating fluid before use. It is preferable. The bromine-based oxidant prepared by electrolysis has the highest oxidative effect in the initial stage of production, so it is preferable to prepare it at the place of use. In the method according to the preferred embodiment of the present invention, the brominated oxidant prepared by electrolysis is generally added to the circulating liquid within 120 minutes, more preferably within 30 minutes, and further preferably within 5 minutes after the preparation. Is preferred.

As described above, according to the present invention, a liquid containing a bromine-based oxidizing agent prepared by electrolysis of a bromine compound is brought into contact with a malodorous gas to decompose and remove the odorous component in the malodorous gas. You can

The present invention further provides an apparatus for carrying out the deodorizing method described above. That is, another aspect of the present invention is to provide an electrolyzer for electrolyzing an aqueous solution of a bromine compound to prepare a bromine-based oxidant, and a liquid containing the bromine-based oxidant prepared in the electrolyzer to give a bad odor. It relates to a deodorizing device for offensive odor gas, which is provided with a processing device which is brought into contact with gas.

FIG. 1 shows the concept of a deodorizing device according to one embodiment of the present invention. The deodorizing apparatus according to one embodiment of the present invention shown in FIG. 1 includes a chemical cleaning tower filled with a filler as a malodorous gas processing apparatus. The chemical cleaning tower shown in FIG. 1 is a horizontal chemical cleaning tower in which a gas is passed laterally through a cleaning tower filled with a filler to pass the filler. As the packing material to be filled in the chemical cleaning tower, any packing material used in the gas-liquid contact tower, for example, a packing material made of plastic or porcelain can be used. Generally, the length of the packed bed along the gas flow direction is preferably 500 mm to 1000 mm, and a plurality of packed beds can be arranged in the chemical cleaning tower, or a plurality of chemical cleaning towers can be arranged in series or in parallel. . The malodorous gas to be deodorized is introduced into the tower from one side of the chemical washing tower, flows laterally in the tower and passes through the packing material, and then is discharged as a treated gas from the other side of the tower. On the other hand, the chemical solution is constantly sprayed from the sprinkler installed above the packing material in the chemical solution washing tower toward the packing material, and after contacting the malodorous gas with the gas-liquid, it is recovered from the bottom of the chemical solution cleaning tower and circulated. It is supplied to the sprinkler again by the pump.

The deodorizing apparatus according to one embodiment of the present invention shown in FIG. 1 further comprises an electrolyzer for receiving an aqueous solution of a bromine compound and subjecting it to electrolysis to prepare a bromine-based oxidizing agent.
The bromine-based oxidizing agent prepared by the electrolyzer can be added to the chemical solution recovered from the bottom of the chemical solution washing tower. The chemical liquid to which the brominated oxidant has been added is supplied to the sprinkler by a circulation pump. Watering is 1 per unit amount of treated gas
It is preferably carried out in an amount of about 5 liter / m ³ -gas, usually about 3 liter / m ³ -gas.

The present invention can also be applied to a so-called vertical type chemical cleaning tower. FIG. 2 shows a specific example in which the present invention is applied to a vertical type chemical cleaning tower. In the chemical cleaning tower of FIG.
The malodorous gas is introduced into the gas phase portion (the space between the filler and the liquid level of the circulating liquid) at the bottom of the chemical cleaning tower filled with the filler,
After flowing upward in the column and passing through the packing material, it is discharged from the top of the column as a processing gas. On the other hand, the drug solution is always
It is sprayed from the sprinkler located above the packing material in the chemical cleaning tower toward the packing material, and after contact with the malodorous gas and gas, it is collected from the bottom of the chemical cleaning tower and supplied to the spraying apparatus again by the circulation pump. To be done.

Further, there is also a vertical chemical liquid cleaning tower as shown in FIG. 2 in which the gas is introduced from the top of the tower and discharged from the bottom of the tower so that the gas flows downward. The present invention can also be applied to such a chemical cleaning tower.

The present invention can be applied to any of the horizontal chemical cleaning tower, the upward gas flow vertical chemical cleaning tower, and the downward gas flow vertical chemical cleaning tower as described above. For example, if the height of the device is not limited, such as when installing outside the building, it is possible to apply a vertical chemical cleaning tower that increases the size of the deodorizing device. The flow type can be preferably used. On the other hand, the horizontal chemical cleaning tower is preferable when the height of the device is limited, such as when installed in a building, or in consideration of maintainability. In an actual device, a horizontal chemical cleaning tower has been widely put into practical use. Therefore, also in the practice of the present invention, it is preferable to use the horizontal chemical cleaning tower.

When the malodorous gas comes into contact with the circulating fluid,
The malodorous gas is humidified, or the liquid mist is entrained in the gas, so the amount of circulating fluid in the deodorizing device decreases, and the circulating water pump becomes difficult to operate due to low water level. It may cause a failure. In order to avoid this problem, makeup water can be added to the chemical liquid (circulating liquid) as needed. As makeup water, tap water, well water, industrial water, etc. can be used. However,
When make-up water is added, the difference between the amount added and the moisture carried by the process gas is discharged as blow water out of the apparatus. This blow water has the same composition as the circulating fluid, and the loss of the drug due to this may not be negligible.

Therefore, in a preferred embodiment of the present invention, the bromine-based oxidizing agent prepared by electrolysis of the aqueous bromine compound solution is introduced into the chemical solution washing tower or before being introduced into the packed bed of the chemical solution washing tower. Can be sprayed on offensive gas. That is, another aspect of the present invention is to fill the inside of the filling material, spray the chemical solution from a sprinkler device arranged above the filling material, and at the same time, pass the malodorous gas through the filling material to cause the chemical solution to flow. And a malodorous gas in a liquid-liquid cleaning tower; a malodorous gas supply line for supplying a malodorous gas to the liquid chemical cleaning tower; a gas discharge line for discharging a processing gas from the liquid chemical cleaning tower; and a bottom of the liquid chemical cleaning tower A chemical liquid circulation line for collecting the chemical liquid and supplying the chemical liquid to a sprinkler device arranged above the filling material; and further for electrolyzing an aqueous solution of a bromine compound to prepare a bromine-based oxidizing agent. A device for spraying a liquid containing a brominated oxidant prepared in the electrolyzer into a gas in a malodorous gas supply line and / or a brominated oxidant prepared in the electrolyzer Liquid circulation Means for adding to the line; about deodorizer malodorous gases, characterized by comprising comprises a.

The bromine-based oxidant prepared by electrolysis of the bromine compound according to the present invention has a high oxidative effect at the initial stage of production. Therefore, the bromine-based oxidant prepared in this manner causes a malodorous gas to flow into the chemical cleaning tower. By spraying the odorous gas and bringing it into contact with the odorous gas before or at the entrance of the packed bed, the odorous component in the odorous gas can be decomposed and removed in advance. As a result, most of the sprayed bromine-based oxidizing agent is consumed for the deodorizing treatment, and the remaining unreacted chemicals are mixed with the circulating liquid in the chemical cleaning tower, so that the chemicals are not wasted. This can reduce the loss of chemicals due to blow water.

When the bromine-based oxidant according to the present invention is sprayed on the malodorous gas supply line, it is possible to cause a reaction between the drug and the odorous component of the malodorous gas with a liquid having a strong oxidizing power, which is neutral or less, It is possible to reduce the amount of medicine used with respect to the amount of removed odor components. In order to efficiently carry out the reaction between the odorous component of the malodorous gas and the drug, it is necessary to lower the pH from 10 to 7 or less for both the drug of the present invention and the commercially available drug.
When H is lowered, a halogen gas is generated and becomes a new odor source, or a problem of corrosion occurs, so that there is a possibility that operation of the chemical cleaning tower will be seriously hindered. On the other hand, when a bromine-based oxidizer is sprayed on the malodorous gas supply line, even if halogen gas is generated, it is absorbed in the circulating fluid of the deodorizing device, and it becomes an active ingredient of the drug for the deodorizing reaction. Since it is used, the above problems do not occur. The size of droplet particles when spraying the bromine-based oxidizing agent is not particularly limited, and any commercially available spray nozzle can be used.

The brominated oxidant prepared by electrolysis can be added to either the circulating liquid or the malodorous gas, or to both, as described above. Which part of the deodorizing device to add the brominated oxidant prepared by electrolysis to the malodorous gas can be appropriately determined depending on the properties of the malodorous gas to be treated.
For example, in the case of deodorizing a malodorous gas containing a large amount of easily decomposable hydrogen sulfide according to the present invention, it is preferable to spray a brominated oxidant prepared by electrolysis on a malodorous gas supply line, and the decomposition time When a malodorous gas containing a large amount of methyl sulfide, etc., which is required to be deodorized by the present invention, it is preferable to add a brominated oxidant prepared by electrolysis to the circulating liquid.

[0032]

The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples.

Example 1 A deodorizing treatment experiment of a malodorous gas was conducted by using the deodorizing apparatus (horizontal type chemical cleaning tower type) shown in FIG. As the gas to be treated, a simulated gas prepared by using a commercially available standard gas and air was used as the raw gas. The composition of the raw gas is 2ppm hydrogen sulfide,
Methyl mercaptan was 1 ppm and methyl sulfide was 0.5 ppm. In the horizontal chemical cleaning tower used, the cross-sectional area of the packing material in the flow direction of the malodorous gas was 1 m ² , and the total length of the packed bed was 1 m. The filler used was a commercially available plastic filler (specific surface area 100 m ² / m ³ ). Raw gas,
From the malodorous gas inlet of the horizontal chemical cleaning tower, the empty tower linear velocity is 1.0
Aeration was continuously performed at m / sec, and the chemical liquid was sprayed from above the packed bed at a water spray amount of 3 liter / m ³ -gas (water spray amount per unit treated gas amount). The gas temperature was 20-25 ° C.

As the medicine, a bromine-based oxidizing agent (electrolytic bromine-based oxidizing agent) prepared by electrolysis according to the present invention, commercially available sodium hypochlorite, and an aqueous solution of sodium hypochlorite containing 10% by weight of available chlorine are used. Hypobromous acid (prepared hypobromous acid) prepared by adding sodium bromide in an equal amount of sodium hypochlorite and reacting them was added to the circulating liquid at various addition rates shown in Table 1. The concentration of each added drug was 8% in terms of chlorine equivalent. The chlorine conversion value is
It was determined by the iodine titration method described in JIS-K0102. After the chemicals were added to the circulating fluid, the pH of the circulating fluid was adjusted to 10 with caustic soda.

The electrolytic bromine-based oxidizer according to the present invention uses a 10 wt% sodium bromide aqueous solution as an electrolytic solution, and has a voltage of 10 V (direct current), a current density of 2 A / dm ² , and a carbon electrode spacing of 10 m.
What was prepared by electrolysis under the electrolytic condition of m was immediately added to the circulating fluid.

Table 1 shows the properties of the gas discharged from the deodorizing apparatus which was contact-treated with the chemicals.

[0037]

[Table 1]

From the results shown in Table 1, when the bromine-based oxidizing agent prepared by electrolytic treatment of a bromine compound according to the present invention was used, it was compared with commercially available sodium hypochlorite and prepared hypobromic acid prepared by a chemical reaction. Then, it can be seen that the odorous components of the malodorous gas could be decomposed and removed more efficiently.

Example 2 In the deodorizing apparatus shown in FIG. 1, an experiment was conducted in the same manner as in Example 1 except that the electrolytic bromine-based oxidizing agent according to the present invention was added to the circulating liquid and sprayed on the malodorous gas supply line. It was Table 2 shows the properties of the deodorizing device outlet gas.

[0040]

[Table 2]

From the results shown in Table 2, the electrolytic bromine-based oxidizer according to the present invention was added to the circulating liquid and sprayed directly onto the malodorous gas supply line to improve the decomposition and removal performance of the hardly decomposable methyl sulfide. I know what I did.

[0042]

According to the method of the present invention, the following effects can be obtained. (1) The chemicals prepared by electrolysis can be added to the deodorizing device in a required amount, the deodorizing effect is high, and the deodorizing device can be operated stably.

(2) By preparing an oxidizer by electrolyzing it at the site of deodorization treatment, it is possible to avoid a large amount of storage of dangerous chemicals, and it is easy to manage the operation, and the highly reactive chemicals can be immediately removed. It can be added.

(3) The raw material of the brominated oxidant according to the present invention is
It is stable and does not change its properties even after long-term storage such as sodium bromide. Therefore, the bromine-based oxidizer according to the present invention can be produced by using a stable raw material and electrolyzed in a required amount when necessary, and thus, as in sodium hypochlorite, etc. Compared to conventional oxidizers that deteriorate during storage, stable deodorization is possible.

(4) The bromine-based oxidant addition rate can be easily adjusted by changing the operating conditions of the electrolyzer, and can immediately respond to changes in the concentration of the odorous component of the malodorous gas.

(5) By spraying the drug directly on the malodorous gas supply line, the amount of drug lost in the blow water can be reduced.

[Brief description of drawings]

FIG. 1 is a conceptual diagram showing the configuration of a deodorizing device in which the present invention is applied to a horizontal chemicals cleaning tower.

FIG. 2 is a conceptual diagram showing a configuration of a deodorizing device in which the present invention is applied to a vertical type chemical cleaning tower.

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) B01D 53/34 ZAB B01D 53/34 116D 53/77 ZAB C25B 1/24 F term (reference) 4C080 AA07 BB02 CC12 CC15 HH03 KK08 LL04 MM01 QQ01 QQ11 4D002 AA03 AA05 AA06 AA32 AB02 AC10 BA02 BA05 CA01 CA07 CA13 DA02 DA03 DA06 DA17 DA37 EA06 EA11 4D020 AA04 AA09 AA10 BA07 BB03 BC05 CB08 CB25 CC15 CC03 AB20 CC20 CC10

Claims (5)

[Claims] 1. A method for deodorizing malodorous gas, which comprises electrolyzing an aqueous solution of a bromine compound to prepare a bromine-based oxidizing agent, and bringing the prepared liquid containing the bromine-based oxidizing agent into contact with a malodorous gas. 2. The deodorizing method according to claim 1, wherein the bromine compound is selected from sodium bromide, potassium bromide, magnesium bromide, ammonium bromide and hydrobromide water. 3. The bromine compound aqueous solution is electrolyzed at the site of the deodorizing treatment, so that the prepared liquid containing the bromine-based oxidizing agent is brought into contact with the malodorous gas promptly.
Or the deodorizing method described in 2. 4. An electrolyzer for electrolyzing an aqueous solution of a bromine compound to prepare a bromine-based oxidant, and a malodor which brings a liquid containing the bromine-based oxidant prepared in the electrolyzer into contact with a malodorous gas. A deodorizing device for offensive odor gas, comprising a gas processing device. 5. A filling material is filled in the interior, and the chemical liquid is sprayed from a water sprinkler disposed above the filling material, and the malodorous gas is passed through the filling material to flow the chemical liquid and the malodorous gas. A chemical cleaning tower that makes gas-liquid contact; a malodorous gas supply line that supplies a malodorous gas to the chemical cleaning tower; a gas discharge line that discharges a processing gas from the chemical cleaning tower; and a chemical solution recovered from the bottom of the chemical cleaning tower, A chemical liquid circulation line for supplying the chemical liquid to the sprinkler device arranged above the filling material;
And an electrolyzer for electrolyzing an aqueous solution of a bromine compound to prepare a bromine-based oxidant; and a liquid containing the bromine-based oxidant prepared in the electrolyzer in a malodorous gas supply line. Means for spraying to the gas and / or means for adding a liquid containing a bromine-based oxidizing agent prepared in the electrolyzer to a chemical liquid circulation line; and a deodorizing device for a malodorous gas.