KR100605021B1 - Phase separation scrubber according to odor characteristic - Google Patents

Abstract

According to the present invention, a phase separation scrubber comprising a first deodorizing portion and a second deodorizing portion, wherein the first deodorizing portion and the second deodorizing portion are formed by being separated by a first phase separator having a plurality of stacks. Is provided.

According to such a phase separation scrubber, there is an advantage that the air containing the complex malodorous substance in which acidic, basic and neutral series malodorous substances are mixed can be effectively purified.

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Description

Phase separation scrubber according to odor characteristic

1 is a cross-sectional view of a scrubber according to the prior art,

2 is a cross-sectional view of a phase separation scrubber according to an embodiment of the present invention;

3 is a partially enlarged view of a first phase separator according to an embodiment of the present invention;

4 is an experimental result of acetaldehyde according to the first embodiment,

5 is an experimental result of butylaldehyde according to the first embodiment,

6 is an experimental result of hydrogen sulfide according to the first embodiment,

7 is an experimental result of ammonia according to the second embodiment,

8 is an experimental result of trimethylamine according to the second embodiment,

9 is an experimental result of hydrogen sulfide according to the second embodiment,

10 is an experimental result of methyl mercaptan according to the second embodiment,

11 is an experimental result of methyl disulfide according to the second embodiment.

<Explanation of symbols for the main parts of the drawings>

100: first deodorizing portion 110: acid solution bath

120: acid solution transfer unit 130: acid solution contact portion

140: acid solution removing unit 150: acid solution supply unit

160: electrolysis unit 200: first phase separator

210, 410: stack 220, 420: solution collecting part

221, 421: Collection solution exclusion pipe 300: second withdrawal

310: basic solution tank 320: basic solution transfer unit

330: basic solution contact unit 340: basic solution removal unit

350: basic solution supply unit 400: second phase separator

500: third deodorizing unit 510: oxidant solution tank

520: oxidant solution transfer unit 530: oxidant solution contact unit

540: oxidant solution removal unit 550: oxidant solution supply unit

560: exhaust port 600: phase separation scrubber

The present invention relates to a phase separation scrubber, and more particularly, to a phase separation scrubber for removing odor gas generated in a malodor generating facility.

In general, the deodorization method includes a gas absorption method, an adsorption method, an ozone use method, a biological deodorization method, a combustion method, and a deodorant spray method. The present invention uses a gas absorption method. This is a method in which the malodorous gas generated from the malodorous source is moved into the gas-liquid interface, is in contact with the solution, dissolved in the liquid phase and diffused into the liquid body. The apparatus in which the above deodorization method is performed is called a scrubber.

1 is a cross-sectional view of a scrubber according to the prior art. According to the prior art, the deodorizing solution first enters the deodorizing solution tank 2 while the deodorizing solution injection valve 8 is opened. After the injection of the deodorizing solution into the deodorizing solution tank 2, the deodorizing solution injection valve 8 is closed. Here, the suction blower 1 is opened and air containing the malodorous gas enters, and the deodorizing solution pump 3 is operated to move the deodorizing solution from the deodorizing solution tank 2 to the injection nozzle 5. The deodorizing solution is injected downward from the injection nozzle 5 and the air containing the malodor gas and the deodorizing solution injected from the injection nozzle 5 react at the contact portion 4. The air passing through the contact portion 4 rises and passes through the deodorizing solution removing unit 6, at which time the deodorizing solution contained in the air is removed. Here, the removed deodorizing solution is entered into the deodorizing solution tank (2) again, the deodorizing solution that has been reacted out of the deodorizing solution tank (2) while the deodorizing solution discharge valve (7) is opened. The air from which the deodorizing solution is removed is discharged to the outside through the exhaust port (9).

Since the scrubber according to the prior art has one deodorizing solution tank 2, there is a limit in removing odor gas containing complex odor substances such as acidic substances, basic substances, and neutral substances. In addition, ozone, sodium hypochlorite in the scrubber according to the prior art. When using an oxidizing agent such as chlorine dioxide, there is a disadvantage in that the intrinsic odor of the unreacted oxidizing agent cannot be controlled in the oxidation reaction, so the odor concentration is rather increased.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object thereof is to provide a phase separation scrubber that effectively removes malodorous gases containing complex malodorous substances.

Other objects and advantages of the invention will be described below and will be appreciated by the embodiments of the invention. Further objects and advantages of the invention may be realized by means and combinations indicated in the claims.

The phase separation scrubber of the present invention for achieving the above object is connected to an acid solution supply unit, an acid solution tank having an acid solution injection valve and an acid solution discharge valve, connected to the acid solution tank, an acid solution pump and an acid solution An acid solution transfer part having an injection nozzle, an suction blower for sucking air containing odor gas, an acid solution contact part formed under the acid solution injection nozzle and contacting the acid solution and air, and the acid solution spray nozzle A first deodorizing unit formed at an upper portion thereof and including an acid solution removing unit for removing an acid solution contained in air; And a basic solution tank connected to the basic solution supply unit and having a basic solution injection valve and a basic solution discharge valve, and connected to the basic solution bath and having a basic solution pump and a basic solution spray nozzle. It is formed in the lower part of the nozzle and the basic solution contact portion for contacting the basic solution and air, the basic solution removal unit is formed on the top of the basic solution spray nozzle and removes the basic solution contained in the air, and the air to remove the odor gas And a second deodorizing part including an exhaust port, the first deodorizing part and the second deodorizing part being separated by a first phase separator having a plurality of stacks.

Here, it is separated by the second phase separator having a plurality of stacks and the second deodorizing portion and formed on one side of the second deodorizing portion, and connected to the oxidant solution supply unit, and provided with an oxidant solution injection valve and an oxidant solution discharge valve An oxidant solution bath, connected to the oxidant solution bath, an oxidant solution transfer unit having an oxidant solution pump and an oxidant solution nozzle, an oxidant solution contact part formed under the oxidant solution spray nozzle and contacting the oxidant solution and air; It is preferable to further include a third deodorizing portion formed on the oxidant solution spray nozzle and including an oxidant solution remover to remove the oxidant solution contained in the air.

In addition, it is preferable to include an electrolysis unit connected to the acid solution bath, an electrolyte storage unit connected to the electrolysis unit to provide an electrolyte, and an electricity supply unit to supply electricity to the electrolysis unit.

In addition, the electrolysis unit preferably includes an inner conveying unit having an inner conveying pump at one side thereof.

In addition, the phase separator is preferably formed to collect the solution to be removed from the solution removal unit and preferably comprises a solution collection unit connected to the collection solution discharge pipe.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Prior to this, terms or words used in the present specification and claims should not be construed as being limited to the common or dictionary meanings, and the inventors should properly explain the concept of terms in order to best explain their own invention. Based on the principle that can be defined, it should be interpreted as meaning and concept corresponding to the technical idea of the present invention.

Therefore, the embodiments described in the specification and the drawings shown in the drawings are only one of the most preferred embodiments of the present invention and do not represent all of the technical idea of the present invention, various modifications that can be replaced at the time of the present application It should be understood that there may be equivalents and variations.

Referring to the drawings, Figure 2 is a cross-sectional view of a phase separation scrubber according to an embodiment of the present invention, Figure 3 is a partially enlarged view of a first phase separator according to an embodiment of the present invention.

The phase separation scrubber 600 includes a first deodorization unit 100, a first phase separator 200, a second deodorization unit 300, a second phase separator 400, and a third deodorization unit 500. .

The first deodorizing unit 100 is for removing basic odorous substances in the air, acid solution tank 110, acid solution transfer unit 120, acid solution contact unit 130, acid solution removal unit 140, Located in the lower portion of the phase separation scrubber 600 includes an acid solution supply unit 150 for supplying an acid solution, an electrolysis unit 160, a suction blower 170 for sucking the air containing odorous substances.

The acid solution tank 110 stores an acid solution capable of removing basic malodorous substances. One side of the acid solution tank 110 is connected to the acid solution supply unit 150 to receive an acid solution. It is preferable to form a valve in a portion where the acid solution supply unit 150 and the acid solution tank 110 is connected. Accordingly, if necessary, the valve may be opened to allow the acidic solution to move from the acidic solution supply unit 150 into the acidic solution tank 110.

The acid solution transfer unit 120 is a device for moving the acid solution stored in the acid solution tank 110 to the top. One end of the acid solution transfer part 120 is connected to the acid solution tank 110, and the other end is provided with an acid solution spray nozzle 122. Accordingly, the acid solution transferred upward from the acid solution tank 110 is sprayed downward through the acid solution spray nozzle 122. In addition, the acid solution transfer unit 120 is a pump 121 is formed on one side thereof, it is preferable that the pump provides a transfer force for moving the acid solution to the top.

The acidic solution contact portion 130 is for causing the oxidant generated by the acidic solution and the electrochemical oxidation reaction and the basic malodorous substance in the air to remove the basic substance from the malodorous substance in the air. The acidic solution contact portion 130 is located between the suction blower 170 and the acidic solution spray nozzle 122, by the acidic solution and the electrochemical oxidation reaction that is injected from the acidic solution spray nozzle 122 It serves to increase the reaction efficiency of the produced oxidant and odorous substances in the air. The acidic solution contact portion 130 is a filler having a large porosity and specific surface area so as to widen the contact area between the acidic solution sprayed from the acidic solution spray nozzle 122 and the oxidant generated by the electrochemical oxidation and the odorous substance in the air. It is preferable to form.

The acidic solution removing unit 140 is for removing the acidic solution contained in the air that reacts with the acidic solution from the acidic solution contacting unit 130. In the acid solution contact unit 130, the air reacted with the oxidant generated by the acid solution and the electrochemical oxidation reaction enters the second deodorizing unit and reacts with the basic solution again. If the acidic solution contained in the air is not removed, the reaction efficiency at the second deodorizing unit is lowered. Accordingly, the acidic solution removing unit 140 is provided to separate and drop the solution from the air and to discharge only the air.

The electrolysis unit 160 has one side connected to the acid solution tank 110 and the other side connected to the electrolyte storage unit 161. The electrolysis unit 160 has an electric supply unit 163 on one side for supplying electricity used for electrolysis, so that the basic odorous substances containing nitrogen such as ammonia and trimethylamine can be effectively removed. do. The acid solution of the acid solution tank 110 is continuously injected into the electrolysis unit 160 using the raw water for electrolysis, and the electrolyte solution in the electrolyte storage unit 161 is continuously added. Accordingly, the oxidant is generated by the electrochemical oxidation reaction in the electrolysis unit 160. The generated oxidant flows into the acidic solution tank 110 and is used to remove basic odorous substances in the air. In addition, the electrolysis unit 160 has an inner conveying unit 162, it is preferable to circulate the solution in the electrolytic unit 160 using a pump formed on one side of the inner conveying unit 162. Do. Accordingly, the inner conveying unit 162 serves to facilitate contact with the acidic solution flowing into the electrolysis facility and to prevent dust particles contained in the malodorous gas from adhering to the electrode.

The first phase separator 200 is formed between the first deodorizing unit 100 and the second deodorizing unit 300 and serves to separate the deodorizing units of each step from being influenced by each other. The first phase separator 200 includes a stack 210 and a solution collecting unit 220 that serve as passages through which air moves. The basic solution contained in the air in the second deodorizing unit 300 is separated from the air in the basic solution removing unit 340. At this time, the basic solution to be separated is lowered and the solution collecting unit 220 is formed so that the falling basic solution is collected in the first phase separator (200). The solution collection unit 220 may be modified in various forms as a temporary example. The solution collection unit 220 is connected to the collection solution discharge pipe 221 and the collection solution discharge pipe 221 is also connected to the basic solution tank 310. Accordingly, the basic solution collected by the solution collector 220 may enter the basic solution tank 310 along the collection solution excretion pipe 221.

The second deodorizing unit 300 is for removing acidic odorous substances in the air, and includes a basic solution tank 310 containing a basic solution, a pump 321 on one side, and a basic solution spray nozzle 322 at one end. A basic solution transfer part 320 for transferring a basic solution, a basic solution contact part 330 for reacting a basic solution with a malodorous substance, a basic solution removing part 340 for removing a basic solution in air, and a phase separation scrubber It is integrally attached to the 600 and includes a basic solution supply unit 350 for supplying a basic solution. Here, the basic solution tank 310 is the acid solution tank 110, the basic solution transfer unit 320 is the acid solution transfer unit 120, and the basic solution contact unit 330 is the acid solution contact unit 130 and the basic solution removing unit 340 is the same member as the acidic solution removing unit 140 so that repeated description thereof will be omitted.

The second phase separator 400 is located between the second deodorization unit 300 and the third deodorization unit 500. The second phase separator 400 includes a stack 410, a solution collecting unit 420 for collecting an oxidant solution, and a collection solution drain pipe 421 for transferring an oxidant solution.

Here, the stack 410, the solution collecting unit 420, the collection solution discharge pipe 421 is a stack 210, the solution collection unit 220, the collection solution discharge pipe 221 and the first phase separator, respectively. Since the same member, repeated description will be omitted.

The third deodorizing part 500 may be further provided to remove neutral odorous substances in the air that cannot be removed from the first deodorizing part 100 and the second deodorizing part 300. The third deodorizer 500 includes an oxidant solution tank 510 for accommodating an oxidant solution, a pump 521 on one side, and an oxidant solution transfer part 520 having an oxidant solution spray nozzle 522 at one end. The oxidant solution contact portion 530, which allows the oxidant solution and the malodorous substance to react, the oxidant solution remover 540 for removing the oxidant solution in the air, and the oxidant for supplying the oxidant solution integrally attached to the phase separation scrubber 600. The solution supply unit 550 includes an exhaust port 560 through which the air from which the malodorous substance has been removed is discharged to the outside. Here, the oxidant solution tank 510 is the acid solution tank 110, the oxidant solution transfer unit 520 is the acid solution transfer unit 120, and the oxidant solution contact unit 530 is the acid solution contact unit 130 and the oxidant solution removing unit 540 is the same member as the acidic solution removing unit 140, so that repeated description thereof will be omitted.

Hereinafter, the overall reaction according to the phase separation scrubber of the present invention having the structure as described above will be described by way of examples.

Odor treatment step of the phase separation scrubber of the present invention is ammonia (NH ₃ ⁺ ), trimethylamine [(CH ₃ ) ₃ N], acetic acid (CH ₃ COOH), propionic acid (CH ₃ CH ₂ COOH), hydrogen sulfide (H ₂ S), methyl mercaptan (CH ₃ SH), methyl sulfide [(CH ₃ ) ₂ S], methyl disulfide [(CH ₃ ) ₂ S ₂ ], acetaldehyde (CH ₃ CHO), etc. It was. Ammonia and trimethylamine in the complex malodorous substances presented above are basic series materials, and hydrogen sulfide, methyl mercaptan, acetic acid, and propionic acid are acidic series materials, and methyl sulfide, methyl disulfide, and acetaldehyde are neutral series materials. Further, the acidic solution of the first deodorizing part is sulfuric acid (H ₂ SO ₄ ) solution, the oxidant solution of the third deodorizing part is potassium permanganate (KMnO ₄ ) solution, and the basic solution of the second deodorizing part is sodium hydroxide (NaOH). Solution, the electrolyte solution will be described by taking sodium chloride (NaCl) solution as an example.

According to the phase separation scrubber according to the present invention, air containing a malodorous substance is introduced into the first deodorizing unit through the suction blower. In the first deodorizing unit, the following three reactions proceed to remove the basic malodorous substance.

The first reaction is a reaction in which neutralization of absorption of basic malodorous substances by an acidic solution occurs. Most basic malodorous substances are removed in this reaction. When the sulfuric acid solution is injected through the acid solution spray nozzle, the basic malodorous substances ammonia and trimethylamine according to the embodiment of the present invention are removed by the gas-liquid contact at the acidic solution contacting portion.

2NH ₃ + H ₂ SO ₄ → (NH ₄ ) ₂ SO ₄

(CH ₃ ) ₃ N + H ₂ SO ₄ → (CH ₃ ) ₃ NH ₂ SO ₄

The second reaction is a reaction in which the basic odorous substances contained in the acidic solution enter the electrolysis unit and are removed by the oxidation reaction of the electrolysis unit. Here, scheme 2 is a scheme in which ammonia is removed by an oxidation reaction in the electrolysis section.

^{_{2NH 3 + 6OH - → N 2}} + 6H 2 O + 6e-

In the third reaction, the basic odorous substance is removed by gas / liquid contact by continuously spraying an acid solution containing hypochlorous acid and sodium hypochlorite produced by the oxidation reaction according to an embodiment of the present invention in an acid solution spray nozzle. Reaction. Here, Scheme 3 is a reaction scheme of the reaction of sodium chloride is decomposed in the positive electrode and the negative electrode of the electrolysis unit to produce sodium hypochlorite (NaOCl) and hypochlorous acid (HOCl), Scheme 4 is a basic malodorous substance according to an embodiment of the present invention Phosphorus ammonia and trimethylamine are the reaction schemes of the reaction removed by the above hypochlorous acid and sodium hypochlorite.

2Cl ^- → Cl ₂ + 2e ^-

^{_{2H 2 O + 2e → 2OH -}} + H 2

2NaOH + Cl ₂ → NaOCl + NaCl + H ₂ O

NaOCl + H ₂ O → HOCl + NaOH

^{_{2NH 3 + + 3HOCl → N 2}} + 3H + + Cl - + 3H 2 O

2NH ₃ ⁺ + ₃ NaOCl → N ₂ + 3NaCl + 3H ₂ O

(CH ₃ ) ₃ N + NaOCl → (CH ₃ ) ₃ NONaCl

As such, the first deodorizing unit removes the basic malodorous substance by using an oxidant generated by an acidic solution and an electrochemical oxidation reaction. However, here, hydrogen sulfide, methyl mercaptan, methyl sulfide, methyl disulfide, acetaldehyde and the like are also partially oxidized by the hypochlorous acid formed in Scheme 3 to reduce the odor strength. Here, Scheme 5 is a reaction scheme of the hydrogen sulfide, methyl mercaptan, methyl sulfide, methyl disulfide, acetaldehyde is reduced odor by hypochlorous acid.

H ₂ S + 4HOCl → H ₂ SO ₄ + 4HCl

CH ₃ SH + 3HOCl → CH ₃ SO ₃ H + 3HCl

(CH ₃ ) ₂ S + 2HOCl → (CH ₃ ) ₂ SO + HCl

(CH ₃ ) ₂ S ₂ + 5HOCl + H ₂ O → 2CH ₃ SO ₃ + 5HCl

CH ₃ CHO + HOCl → CH ₃ COOH + HCl

As described above, hypochlorous acid generated during the electrolysis process may reduce the odor of various odorous substances including basic odorous substances. The hypochlorous acid has a formation rate of HOCl and OCl ⁻ depending on temperature and pH. In general, HOCl is 40-80 times more potent than OCl ⁻ . Referring to Scheme 6, as the pH of the solution is acidic, the generation rate of hypochlorous acid generated during the electrolysis may increase, resulting in a higher oxidation effect. Therefore, maintaining the acidity of the solution in the first deodorizing portion is not only used for the absorption neutralization of the basic malodorous substance as described above, but also has an additional purpose for increasing the oxidation efficiency.

(HOCl) / (HOCl) + (OCl -) = 1 / [1 + (OCl -) / (HOCl)] = 1 / [1 + k i / (H +)]

As described above, the basic deodorizing material is removed from the first deodorizing part and the acidic solution removing part and the first phase separator are preferably used to remove the acidic solution which may inhibit the next chemical reaction. The air from which the acidic solution has been removed is passed through the stack to the second deodorant.

In the second deodorizing unit according to an embodiment of the present invention, a basic solution is used to remove acidic odorous substances and chlorine gas (Cl ₂ ) generated in the first deodorizing unit. Here, the sodium hydroxide solution, which is the basic solution, is transferred to the basic solution spray nozzle by the basic solution transfer unit and sprayed downward. Accordingly, the sodium hydroxide solution in the basic solution contact portion reacts with the acidic malodorous substance. Here, Scheme 7 is a reaction scheme of removing the unreacted chlorine gas (Cl ₂ ) in the first deodorizing unit and the acid odor substance.

Cl ₂ + 2NaOH → NaOCl + NaCl + H ₂ O

H ₂ S + ₂ NaOH → Na ₂ S + 2H ₂ O

Na ₂ S + NaOCl + H ₂ O → S + NaCl + 2NaOH

CH ₂ SH + NaOH → CH ₃ SNa + H ₂ O

2CH ₃ SH + 4NaOCl → 2CH ₃ SO ₃ + 6NaCl + H ₂

As described above, in the second deodorizing unit, the removal process of the acidic malodorous substance is finished, and the basic solution may be removed by the basic solution removing unit. The air from which the basic solution is removed is discharged to the outside through the exhaust port.

Here, it is preferable that the phase separation scrubber according to the embodiment of the present invention further includes a third deodorizing part on one side thereof. Here, the position of the third detachable portion is not limited and may be moved to various positions. Neutral substances such as methyl sulfide, methyl disulfide, acetaldehyde, styrene, etc. are not water-soluble and have a slow oxidation reaction compared to acidic and basic malodorous substances. For this reason, it is preferable to further provide the 3rd deodorizing part which can process a neutral odorous substance, when the concentration of neutral type substance is high in inflow odor gas. The third deodorizing unit according to an embodiment of the present invention uses potassium permanganate as an oxidizing agent to remove the neutral malodorous substance. Here, Scheme 8 is a reaction scheme of removing the neutral odor substance by potassium permanganate.

3 (CH ₃ ) ₂ S + 20KMnO ₄ → 3K ₂ SO ₄ + 14KOH + 20MnO ₂ + 2H ₂ O + 6CO ₂

(CH ₃ ) ₂ S ₂ + 26 KMnO ₄ → 6K ₂ SO ₄ + 14KOH + 26MnO ₂ + 2H ₂ O + 6CO ₂

3CH ₃ CHO + 10KMnO ₄ → 6CO ₂ + 10KOH + 10MnO ₂ + H ₂ O

3C ₆ H ₆ CHCH ₂ + 41 KMnO ₄ + 7H ₂ O → 24CO ₂ + 41KOH + 41MnO ₂

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

Example 1

Referring to FIG. 1, a conventional scrubber with a reduced size of a deodorization system in which two deodorization units are formed was selected as a comparison target. In addition, according to an embodiment of the present invention, an invention scrubber of which a deodorizing system in which two deodorizing parts are formed is reduced.

Odor substances generated in auto parts factory are composed of acetaldehyde, butyl aldehyde and hydrogen sulfide.The concentration of each component introduced into the scrubber is 0.1 to 0.6 ppm of acetaldehyde, 0.2 to 0.5 ppm of butyl aldehyde and 0.04 to 0.2 ppm of hydrogen sulfide. Indicated. This experiment was carried out by installing a sample suction port at the inlet blower inlet of the existing scrubber and introducing odor gas into each scrubber at 20㎥ per minute using a branch pipe. The experiment was performed by filling the solution in the solution tank at the beginning of the experiment to run under the same operating conditions as the existing scrubber, and then continuously operating for one week without adding an additional solution.

In the case of the conventional scrubber, the odorous substance was removed from the first deodorizing unit and the second deodorizing unit using water, and the scrubber of the present invention was continuously charged by adding an electrolyte using a sulfuric acid solution in the first deodorizing unit. Decomposition was applied to the contacting part, and in the case of the second deodorizing part, it was sprayed on the contacting part of the second deodorizing part using an aqueous solution of sodium hydroxide, and the unreacted chlorine gas in the first deodorizing part and the reaction by-products in the first deodorizing part (CH ₃ COOH, etc.). Experimental results were analyzed using the instrument analysis method by taking samples from the inlet and the exhaust of the existing scrubber and invention scrubber.

As a result, the inlet concentrations of acetaldehyde, butylaldehyde and hydrogen sulfide were found to vary slightly depending on the sampling time. Here, Table 1 shows the experimental results of Example 1. Experimental results according to the first embodiment of acetaldehyde are shown in FIG. 4, experimental results according to the first embodiment of butylaldehyde are shown in FIG. 5, and experimental results according to the first embodiment of hydrogen sulfide are shown in FIG. 6.

division Acetaldehyde Butylaldehyde Hydrogen sulfide Inlet concentration Outlet concentration Inlet concentration Outlet concentration Inlet concentration Outlet concentration Old scrubber Invention scrubber Old scrubber Invention scrubber Old scrubber Invention scrubber Day 1 0.12 0.012 0.0012 0.20 0.06 0.004 0.09 ND ND Day 2 0.10 0.012 0.002 0.32 0.12 0.006 0.20 ND ND Day 3 0.60 0.090 0.006 0.50 0.23 0.02 0.04 0.002 ND Day 4 0.35 0.070 0.01 0.30 0.15 0.02 0.15 0.015 0.003 Day 5 0.21 0.06 0.006 0.25 0.15 0.01 0.11 0.02 0.002

In the case of acetaldehyde, the treatment efficiency of 90% was seen after 1 day when the conventional scrubber was operated. However, the treatment efficiency gradually decreased as the operation time passed, and the treatment efficiency was 70% after 5 days. In comparison, the scrubber of the present invention exhibited a treatment efficiency of more than 95% with no change in treatment efficiency over time.

In the conventional scrubber and the conventional scrubber according to the present invention, as the odorous substances are continuously introduced into the scrubber, the acetaldehyde concentration in the solution increases, leading to saturation of the acetaldehyde that can be dissolved in the solution. Therefore, it is estimated that the concentration emitted to the outside increases. In contrast, the phase-separated scrubber according to the present invention is not only treated with acetaldehyde by oxidation in the first deodorizer and additional reaction in the second deodorizer, but also in the case of acetaldehyde present in the first deodorizer solution bath. Treated by a continuous electrolysis reaction. Accordingly, it is judged that the processing ability of acetaldehyde introduced into the scrubber is superior to that of the conventional scrubber.

In the case of butylaldehyde, the water solubility is about 3.7g in 100g of water, so the water solubility is much lower than that of acetaldehyde, so the treatment efficiency in the conventional scrubber is 70% after 1 day, 63% after 2 days, and after 4 days As the operation time passed by 50% and 40% after 5 days, the treatment efficiency changed significantly. In contrast, the phase separation scrubber according to the present invention exhibited a treatment efficiency of 93% to 98% during the operation period, indicating a stable treatment state. Hydrogen sulfide was investigated with good treatment efficiency in both the conventional scrubber and the invention scrubber, but the scrubber of the present invention showed a superior effect in terms of treatment efficiency.

Example 2

This experiment was conducted on the odors generated from the dehydration of food waste anaerobic digested solids and aerobic composting of dehydrated cakes. The experiment was carried out by comparing the existing scrubber which reduced the deodorizing system in which the two deodorizing parts are formed as shown in FIG. The treatment efficiency was compared and examined by the method.

The malodorous substances to be treated in this experiment were ammonia, trimethylamine, hydrogen sulfide, methyl mercaptan and methyl disulfide. Captane 1.6-4.0 ppm and methyl disulfide were examined at 1.5-2.3 ppm.

The sample used in the experiment was carried out by introducing a sample inlet at the front of the suction blower as in Example 1 and introducing odor gas at 20 m 3 per minute to each scrubber using a branch pipe.

The experiment was performed by filling the absorbent bath in the initial stage of the experiment in order to carry out the same operating conditions as the conventional scrubber, and continuously operating for one week without adding additional solution. The contact height and the gas / liquid ratio were performed under the same conditions. .

The operating method used water as a solution of the first deodorizing part and the second deodorizing part in the case of the conventional scrubber, and the phase separation scrubber according to the present invention was continuously electrolyzed by the addition of an electrolyte using a sulfuric acid solution in the first deodorizing part. The first deodorizing part was sprayed with sodium hydroxide aqueous solution and the third deodorizing part was used with potassium permanganate aqueous solution. Samples for comparing the treatment efficiency of the test subjects were taken from the inlet and the exhaust after 1, 3, and 5 days of continuous operation for a week.

The treatment efficiencies of the test subjects examined during this experiment are shown in Table 2 below. Experimental results according to the second embodiment of ammonia is shown in FIG. 7, experimental results according to the second embodiment of trimethylamine is shown in FIG. 8, and experimental results according to the second embodiment of hydrogen sulfide are shown in FIG. 9. Experimental results according to the second embodiment are shown in FIG. 10, and experimental results according to the second embodiment of methyl disulfide are shown in FIG.

division Day 1 Day 3 Day 5 ammonia Inlet concentration 6.2 12.1 17.5 Outlet concentration Original Scrubber 0.93 2.66 5.43 (69%) Invention scrubber 0.10 0.24 0.44 Trimethylamine Inlet concentration 3.2 9.3 11.5 Outlet concentration Original Scrubber 1.82 5.76 8.63 Invention scrubber 0.07 0.14 0.22 Hydrogen sulfide Inlet concentration 2.5 3.8 4.3 Outlet concentration Original Scrubber 0.38 0.91 1.29 Invention scrubber ND 0.06 0.08 Methyl mercaptan Inlet concentration 1.6 2.7 4.0 Outlet concentration Original Scrubber 0.48 1.40 2.72 Invention scrubber ND 0.05 0.10 Methyl disulfide Inlet concentration 1.5 2.3 2.1 Outlet concentration Original Scrubber 0.93 1.84 1.72 Invention scrubber 0.05 0.10 0.14

In the case of ammonia, the existing scrubber showed a relatively good treatment effect with 85% removal efficiency compared to the inlet concentration after 1 day of operation.However, after 5 days, the absorption efficiency of the absorbent solution decreased. 69%. In comparison, the phase-separated scrubber according to the present invention exhibited a stable treatment efficiency of 97% or more despite 7 days of continuous operation.

Trimethylamine had a lower water solubility than the ammonia in the conventional scrubber, and thus exhibited a treatment efficiency of 43% lower than the inlet concentration after one day of operation, and the treatment efficiency decreased as the operation time elapsed. In the case of the phase separation scrubber according to the present invention, trimethylamine showed a similar treatment efficiency to ammonia. As a result of the operation of the phase-separated scrubber according to the present invention, the treatment efficiency for basic odorous substances is better than that of the conventional scrubber. This is presumed to be due to the indirect oxidation effect at the contact point with hypochlorous acid generated during the conversion of ammonia to ammonium sulfate by the aqueous sulfuric acid solution, the conversion of nitrogen sulfate to the electrochemical oxidation of ammonium sulfate and the electrolysis process. Trimethylamine is believed to be due to the conversion of (CH ₃ ) ₃ NH ₂ SO ₄ by aqueous sulfuric acid solution and trimethylamine N-oxide (C ₃ H ₉ NO) conversion by HOCl oxidation.

In the conventional scrubber, the treatment efficiency of hydrogen sulfide was 85% after one day and 70% after five days. Hydrogen sulfide treatment efficiency in the phase separation scrubber according to the present invention was not detected hydrogen sulfide at the exhaust port after 1 day and showed more than 98% after 3 days, 5 days after the start of operation.

In the case of methyl mercaptan, water solubility is lower in the conventional scrubber compared to hydrogen sulfide, which is the same acidic group, and shows poor treatment efficiency of 70%, 48%, and 32% after 1, 3, and 5 days of operation, respectively. In contrast, in the case of phase separation scrubber according to the present invention, methyl mercaptan was not detected at the exhaust port after 1 day of operation, and showed good treatment efficiency of 97.9% and 97.3% after 3 days and 5 days, respectively. As such, the reason why the treatment efficiency of the acid-based malodorous substances hydrogen sulfide and methyl mercaptan in the conventional scrubber is poor is due to the decrease in water solubility and the absorption ability of the absorbent solution over time due to the physicochemical properties of methyl mercaptan. Judging. The reason why the treatment efficiency of the acid-based odorous substances in the scrubber according to the present invention is good is that the process of converting hydrogen sulfide and methylmercaptan into Na ₂ S and CH ₃ SNa by the basic aqueous solution of the second deodorizing portion and the first It is believed that the chlorine gas discharged from the deodorizing unit is due to the conversion of H ₂ S to S and the conversion of CH ₃ SH to CH ₃ SO ₃ H by sodium hypochlorite generated by an aqueous sodium hydroxide solution.

In the case of methyl disulfide, the treatment efficiency in the conventional scrubber showed low treatment efficiency of 38%, 20%, and 18% after 1, 3, and 5 days of operation, respectively. This is believed to be due to the physical and chemical properties of methyl disulfide having low water solubility. In the case of the scrubber according to the present invention, the treatment efficiency after 1 day, 3 days, and 5 days was 96.8%, 95.5%, and 93.2%, respectively. The reason why the phase separation scrubber according to the present invention shows good efficiency of methyl disulfide treatment is conversion to CH ₃ SO ₃ by hypochlorous acid produced in the first deodorizing portion and oxidation reaction by potassium permanganate aqueous solution used in the third deodorizing portion. Judging by

As a result of comparing the treatment characteristics of the conventional scrubber and the scrubber according to the present invention, a compound odor composed of a large number of malodorous substances of acidic, alkaline, and neutral series was found to have excellent treatment efficiency of the scrubber according to the present invention. Confirmed.

According to the phase-separated scrubber according to the present invention, not only the treatment object range of the malodorous substance is wide, but also the treatment efficiency can be expected to be markedly improved compared to the conventional scrubber. When the odorous substances of medium and low concentrations are introduced, two deodorizing portions are treated and three deodorizing portions are provided when the concentrations of high and neutral odorous substances are high, thereby treating the odorous substances to increase the treatment efficiency of the odorous substances. And by providing a phase separator between each deodorizing unit has the advantage that the reaction can be performed independently in each deodorizing unit. In addition, according to the phase separation scrubber according to the invention, the treatment of the malodorous substance is based on the oxidation reaction has the side effect of reducing the amount of contamination load of the solution flowing into the wastewater treatment plant.

Claims (5)

An acid solution tank connected to an acid solution supply unit and having an acid solution injection valve and an acid solution discharge valve, an electrolysis unit connected to the acid solution tank, an electrolyte storage unit connected to the electrolysis unit to provide an electrolyte, and the electricity An electricity supply unit for supplying electricity to the decomposition unit, an acid solution transfer unit having an acid solution pump and an acid solution spray nozzle connected to the acid solution tank, a suction blower for sucking air containing odor gas, and the acid solution spray nozzle A first deodorizing part including an acid solution contact part formed at a lower portion of the acid solution contact part to contact the acid solution and air, and an acid solution removing part formed at an upper part of the acid solution spray nozzle and removing the acid solution contained in the air; And A basic solution tank connected to a basic solution supply unit and having a basic solution injection valve and a basic solution discharge valve; It is formed in the lower portion of the basic solution contact portion for contacting the basic solution and air, formed on top of the basic solution injection nozzle, the basic solution removal unit for removing the basic solution contained in the air, and to discharge the air from which the odor gas is removed A second deodorizing part including an exhaust port, A phase separation scrubber, characterized in that the first deodorizing portion and the second deodorizing portion are separated by a first phase separator having a plurality of stacks. The method of claim 1, An oxidant solution separated by the second phase separator having a plurality of stacks and a plurality of stacks and formed on one side of the second deodorizer, connected to an oxidant solution supply unit, and having an oxidant solution injection valve and an oxidant solution discharge valve. An oxidant solution transfer part connected to a water tank and the oxidant solution bath and having an oxidant solution pump and an oxidant solution nozzle, an oxidant solution contact part formed under the oxidant solution spray nozzle and contacting an oxidant solution and air, and the oxidant solution And a third deodorizing unit formed on the injection nozzle and including a oxidant solution removing unit for removing the oxidant solution contained in the air. delete The method of claim 3, wherein The electrolysis unit phase separation scrubber, characterized in that it comprises an inner conveying portion having an inner conveying pump on one side thereof. The method according to claim 1 or 2, The phase separator is a phase separation scrubber, characterized in that the solution to be removed from the solution removal unit is collected and provided with a solution collector connected to the collection solution discharge pipe.

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