KR20030015805A - Multi-stage malodor removal system for the removal of highly concentrated malodor gas and its reuse - Google Patents

Abstract

PURPOSE: Provided is a multi-stage deodorization apparatus for effectively deodorizing highly concentrated malodor gas by bubbling the offensive odor in chemicals to neutralize the offensive order by chemicals, so that reaction time of the offensive odor and the chemicals becomes greatly short, a chemical reactor has a small size, and operation cost of the deodorizing apparatus is lowered. CONSTITUTION: The deodorization apparatus comprises a filter for removing particulate contaminants such as dust contained in offensive odor, a chemical reactor for removing the offensive odor by chemical neutralization reaction by bubbling the offensive odor in chemical solution, and a biofilter(16) for removing small amount of the offensive odor remained after the chemical neutralization reaction, wherein the chemical reactor comprises a diluting vessel(7) for diluting the offensive odor out from an ammonia gas bomb(1) and a hydrogen sulfide gas bomb(3) and a chemical reaction vessel(8) in which the diluted offensive odor is bubbled.

Description

MULTI-STAGE MALODOR REMOVAL SYSTEM FOR THE REMOVAL OF HIGHLY CONCENTRATED MALODOR GAS AND ITS REUSE}

The present invention relates to an apparatus for efficiently removing a large amount of odor gas generated in a closed business place, pig house and pig house, waste and wastewater treatment plant, manure treatment plant, garbage landfill, food treatment plant, waste treatment plant. This odor removing device is equipped with a filtration device for removing dust and other particulate contaminants, and is a chemical treatment method to remove high concentration of odorous gas in a secondary manner, and finally, a microorganism having residual odor components attached to a carrier. Completely eliminated biological treatment consists of one system.

Odor refers to an unpleasant odor, which stimulates the mental and nervous system of a person, causing emotional life and health damage. Under the current air conservation law, hydrogen sulfide, mercaptans, amines, and other irritating gaseous substances Smell that stimulates the sense of smell and disgust. "

Ammonia (NH ₃ ), which is a representative malodorous substance, is produced not only in chemical processes such as chemical fertilizer manufacturing facilities and dye production facilities but also when nitrogen-containing organic substances are biologically decomposed. In general, it is reported that odorous gases generated in sludge dewatering facilities, manure treatment plants, composting plants, and fish processing markets contain about 100 ppm of ammonia.

Ammonia is not only a major source of odor, but also a toxic gas that blunts the human eye's sensitivity to light at concentrations of 0.45 mg / m3 and affects human brain activity at 0.35 mg / m3.

In particular, the odor generated during the metabolism of livestock is harmful to people working inside the barn and causes various diseases including livestock respiratory diseases, which severely degrades the productivity of livestock. Among them, ammonia is a major cause of keratoconjunctivitis in poultry, and it has been reported that after 72 hours of continuous exposure at 20 ppm, it causes Newkets disease, weight loss and genital disease (Bullis et al., 1950; Anderson et al. , 1964). In addition, as a result of exposing non-pig pork between 37kg and 90kg body weight to 50mg / L ammonia gas for 20 minutes a day, there was a loss of weight gain of about 18.1% per day compared to the control group exposed to 5mg / L concentration. Disease resistance has also been reported to be extremely low (Cole DJA et al., 1996).

The chemical removal of ammonia can be summarized by the following reaction.

2 NH ₃ + H ₂ SO ₄ → (NH ₄ ) ₂ SO ₄

NH ₃ + H ₃ PO ₄ → NH ₄ H ₂ PO ₄

NH ₃ + HCl → NH ₄ Cl

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

In addition, the mechanism of biologically removing ammonia gas can be broadly divided into bacterial assimilation, microbial growth, and bacterial dissimilation, which is a process of nitrification and denitrification.

Nitrification occurs mainly by autotrophic or mixotrophic microorganisms, and ammonium proceeds through nitrite nitrogen to nitrate nitrogen in two stages.

Nitrosomonas europaea and Nitrobacter agilis are known to be mainly involved in the oxidation of ammonium during nitrification.

The first step in ammonium oxidation is the oxidation of ammonia (NH ₃ ) rather than ammonium (NH ₄ ⁺ ), which is endothermic by ammonia mono-oxygenase (AMO) bound to the membrane. The electrons required for this reaction are known to be supplied from the ubiquinone-cytochrome b of the electron transport system. Hydroxylamine (NH ₂ OH) is oxidized to nitrous nitrogen by hydroxylamine oxidoreductase (HAO) and is exothermic.

Nitrous acid nitrogen is oxidized to nitrate nitrogen by nitrite oxidoreductase and is reversible.

^{_{NH 3 + O 2 + 2H +}} + 2e - → NH 2 OH + H 2 O △ G ° = 17 kJ / mol

_{NH 2 O → OH + H 2} NO 2 - + 5H + + 4e -

^{_{NO 2 - + H 2 O →}} NO 3 - + 2H + + 2e -

However, recent Hiorns et al. (1995) The 16S rDNA gene electrode (gene probe) for use by ammonium oxidizing microorganisms Paper Research from nitrifying microorganism type in a real system typically Nitrosospira the most appearance in the natural world or activated sludge with Nitrosomonas said it can only be measured when cultured in the laboratory.

Burrel et al. (1998) was recently announced that the nitrite-oxidizing bacteria are Nitrospira mainly exists instead Nitrobacter in activated sludge, Schramm et al. (1998) from the nitrification reactor gene probe or fluorescence in situ hybridization (FISH) method Nitrosomonas I was reported that Nitrobacter instead Nitrosospira Nitrospira and found the oxidation of ammonia and nitrite microorganisms.

In addition to ammonia, hydrogen sulfide, which is a representative odorous substance, is a odor generated in petroleum refining plants, sewage treatment plants, and livestock farms. Hydrogen sulphide is highly toxic, and inhalation of high concentrations of hydrogen sulphide gas stops internal respiration of cells due to the destruction of iron oxidase, causing paralysis of the central nerve, fainting or respiratory arrest or suffocation. In addition, the body's response to the conjunctiva is quite severe, such as a large amount of tears, photophobia, pain, conjunctival edema, eversion of the eyelids, and the like.

Caustic soda or hypochlorous acid is commonly used to chemically remove hydrogen sulfide. Summarizing these equations is as follows.

H ₂ S + 2 NaOH → Na ₂ S + 2 H ₂ O

H ₂ S + 4 NaOCl → H ₂ SO ₄ + 4 NaCl

For the biological removal of hydrogen sulfide, the equalization of Thiobacillus , Thiosphaera , Thiomicrospira , Thermothrix , Beggiatoa , and Sulfolobus has been mainly cultivated. Among them, various sulfur compounds are used as substrates, and the most widely used microorganisms grow in a wide range of pH and temperature, and they belong to Thiobacillus species. Thiobacillus species are gram positive bacteria and are mainly found in soil, hot spring water, etc., and many of them are grown as inorganic donors using ferrous iron as an electron donor. Some can grow and use carbon as a carbon source by immobilizing CO ₂ in the air.

In the standard condition of 25 ℃, the reaction scheme uses the sulfur compound as a substrate as follows.

H ₂ S + ₂ O ₂ → SO ₄ ^2- + 2H ⁺ ΔG ° = -188.7 Kcal / mol

S + H ₂ O + 1.5 O ₂ → SO ₄ ^2- + 2H + ΔG ° = -140.6 Kcal / mol

^{_{S 2 O 3 - + H 2}} O + 2O 2 → 2 SO 4 2- + 2H + △ G ° = -97.7 Kcal / mol

Thiobacillus species are divided into acidic bacteria that grow well at pH 2-5 and neutrophils that grow well at pH 6-8. Representative acid bacteria include T. thiooxidant and T. ferooxidant , which are used for coal desulfurization and wastewater treatment. Neutral bacteria include T. thioparus and T. denitrificant .

Odor gases such as methyl sulfide, methyl disulfide and methyl mercaptan are thiobacillus sp. Bacillus sp. Pseudomonas sp. It is used to generate NADH, which is absorbed into microbial cells by microorganisms, etc. and used as an energy source for microorganisms, and is used in the pathway for making amino acids. Microorganisms exhibiting this mechanism generally grow well in the neutral pH range. Representative schemes for chemically removing such odors are shown in Table 1 below.

Table 1. Odor Removal Mechanism According to Reaction of Odor Substances and Chemicals

As the treatment techniques of odor and air pollutants, physicochemical treatment methods such as activated carbon adsorption, chemical liquid cleaning, incineration, and biological treatment methods such as biofiltration and soil microbial treatment are used.

The chemical cleaning method is a method of deodorizing by neutralizing, oxidizing, and reducing the chemical solution. It can remove dust and dust at the same time, and is effective in high concentrations of odors.

On the other hand, the effect is low in low concentration and complex odor and there is a drawback to pay attention to the safety of operation and chemicals.

Biofiltration is a technique for biologically treating malodors using microorganisms attached to a carrier, and microorganisms use properties such as malodors and VOCs as metabolites. Biofiltration is the first to use soil microorganisms in Germany in bach for the first time in 1923 to effectively remove hydrogen sulfide released from an early wastewater treatment plant. In Europe, Japan and the Americas, biofiltration is already much more economical than physical and chemical deodorization. It is evaluated as a reliable and stable technology and is currently being converted to such biodeodorization technology.

The present invention is to compensate for the drawbacks of the drug solution cleaning method and biofilter against high concentrations of odor, in particular, in the step of chemically treating the odor component by directly bubbling without spraying the odor component and chemical components By minimizing the contact time by maximizing the contact area with, the device can be manufactured on a small scale by reducing the residence time in the reactor. These devices can be applied to general odor generating areas, especially fertilizer manufacturing plants that produce high concentrations of odors, treatment processes using ammonia stripping, wastewater treatment processes, manure treatment plants, and internal circulation to purify the air in closed houses. It can be applied to systems, microbial fermenters and the like.

1 is a picture and photograph showing a laboratory scale odor removing chemical reaction tank and a biofilter connection device used in the present invention.

2 is a graph showing the removal rate of each ammonia inlet concentration by the odor removal device developed in accordance with the present invention.

3 is a graph showing the removal rate by residence time of ammonia contacting the reactor when using the odor removal device developed according to the present invention.

4 is a graph showing the effective operation period for each concentration of the chemical liquid (sulfuric acid) during ammonia gas treatment by the odor removing device developed according to the present invention.

5 is a graph showing the removal rate of hydrogen sulfide according to the operation period in the mixed gas treatment experiment by the odor removing device developed in accordance with the present invention.

6 is a schematic view and photograph of an actual device of the bidirectional odor removal apparatus according to the present invention.

7 is a schematic view and photograph of the actual device of the multi-directional outflow malodor removing device according to the present invention.

※ Explanation of the code according to the main part of the drawing

1. Ammonia gas cylinder 2. Regulator

3. Hydrogen sulfide gas cylinder 4. Air compressor

5. Air flow controller 6. Inlet gas sampling port

7. Odor gas dilution reactor 8. Chemical liquid reaction tank

9. Diffuser 10. Liquid outlet of chemical reaction tank

11. Chemical reactor gas outlet 12. Biofilter

Odor gas inlet

13. Biofilter 14. Internal filling carrier

An intermediate sampler

15. Final malodorous gas outlet 16. Biofilter

17. pH electrode and pH controller 18. Chemical supply pump

19. Chemical reservoir

The configuration of the apparatus used in the present invention is largely divided into three parts.

At the front end, a filtration device is installed to remove dust and other particulate contaminants contained in the odor gas. As a filtration device, a bag filter capable of collecting 1-100 μm of particulate matter may be used.

In the second stage, a chemical liquid reaction tank 8 is bubbling the chemical liquid to chemically remove the malodor. As the chemical liquid, sulfuric acid, phosphoric acid, hydrochloric acid, hypochlorous acid and the like can be used for alkaline odors including ammonia. Alkaline odors show high pH and the chemicals used here show low pH and this reaction shows neutral pH at the point where the reaction is terminated by neutralization. In particular, ammonia reacts with sulfuric acid to produce ammonium sulfate and exhibits fast reaction rates even with very high concentrations of ammonia. Basic solutions such as caustic soda, hydrogen peroxide and hypochlorous acid can also be used for hydrogen sulfide and other acidic odors.

Finally, the biological treatment part for removing trace odor gas from the chemical reaction tank completely removes trace odor components.

A laboratory scale deodorizer is shown in FIG. 1. In the middle is a reactor containing a chemical solution aka chemical reaction tank (8), the biofilter (biofilter) (16) is connected to the side. Odor from the ammonia gas cylinder (1) and hydrogen sulfide gas cylinder (3) is diluted with air at an appropriate concentration in the odor gas dilution reaction tank (7) and firstly removed through the chemical reaction tank (8) containing the chemical solution. The malodorous component passes through the biofilter 16 and is completely removed.

The experimental device of the chemical reaction tank (8), which is a chemical odor removal reaction tank, used an inner diameter of 30 cm and a height of 70 cm cylindrical acrylic, and the working volume of the inside was tested up to 30 L. In the reactor, various chemical liquids were filled according to the odor component. The odor gas was injected from the top, and four acid pipes (9) were installed in the cylinder to bubbling to maximize the reaction contact area. Ammonia gas and hydrogen sulfide gas were supplied using specially manufactured gas with a purity of 1%. The ammonia gas and hydrogen sulfide gas were supplied by dilution with the air generated from the air compressor (4), and the concentration control was performed by the regulator (2) attached to the cylinder and the air flow controller. Adjustment was carried out using (5) (FIG. 1).

The device configuration of the biofilter 16, which is a biological odor removal device, is as follows.

First, the laboratory-scale column of the biofilter 16 was made of cylindrical acrylic having a diameter of 10 cm and a height of 100 cm, and was directly connected to the vent 11 of the chemical reaction tank to remove untreated odors. The internal filling carrier 14 was filled with 2.4L by combining organic carrier peatmoss, inorganic carrier perlite, and granular activated carbon in a volume ratio of 50:25:25. As the microbial seed, sludge collected from the return sludge tank of D sewage treatment plant was used.

The mechanism of biofiltration is a biological treatment method for treating odor gas using decomposition of microorganisms attached to the surface of a carrier packed inside a column, and is suitable for low concentration and large air volume gas. Microbial degradation is an oxidation, sometimes a reduction, that converts pollutants into carbon dioxide, water, nitrogen gas and organic biomass.

Biofiltration treatment has significantly reduced operating costs compared to conventional physical and chemical treatment methods, shows excellent effects on low concentration of complex odor, and is a deodorizing method that does not emit secondary pollutants. Deodorization system.

Gastec (GASTEC, Japan) was used as an analyzer for odor component and concentration analysis. A total of four sampling ports can analyze odors, and the intake gas sampling port (6), the chemical reaction tank gas outlet (11), and the intermediate sample of the biofilter carrier layer can measure the concentration before entering the first chemical reaction tank. Sphere 13, the final odor gas outlet 15 of the biofilter (biofilter).

The reaction mechanism of the chemical liquid reactor is an acid and alkali neutralization reaction, and the typical neutralization reaction of ammonia gas has the following reaction formula.

2NH ₃ + H ₂ SO ₄ ----> (NH ₄ ) ₂ SO ₄

Congo red and phenolphthalein were used as indicators to confirm the completion of the reaction. Congo red is blue in acid and gradually turns dark orange with increasing pH. Experiments showed that discoloration occurred in the pH range of about 5. Phenolphthalein is an indicator that turns red in colorless alkali in acid, and the preliminary experiment shows that it turns red in pH 7.8.

Therefore, it is possible to determine when the liquid inside the chemical reactor should be replaced as the indicator changes.

Although the present invention will be described in more detail with reference to the following examples, the scope of the present invention is not limited by the following examples.

Example 1 Comparison of Removal Rate by Inflow Ammonia Concentration in a Chemical Reactor

In order to test the removal rate of each ammonia gas, ammonia was injected into the chemical reaction tank (8) by changing the concentration of ammonia gas to 200, 400, 600, 1000 ppm, and outflow of ammonia from the chemical reaction tank (8). The concentration was measured from the chemical reaction tank gas outlet 11. Odor containing ammonia gas was fixed at 70 L / min using the flow controller (5). Sulfuric acid in the chemical liquid reaction tank 8 was 1N and the volume was filled with 12L. The residence time of the ammonia in the sulfuric acid solution showed a residence time of 10 seconds as calculated by the following equation.

T: residence time (seconds)

V: Volume of sulfuric acid solution (L)

Q: Flow rate of ammonia gas (L / min)

As a result of the experiment, the ammonia concentration was not detected in the detection tube 3La as a result of measuring the gas passing through the chemical reaction tank at the ammonia inflow concentration of 100ppm, 200ppm, 400ppm, 600ppm and 1000ppm (Table 2, Fig. 2). The pH rose to 0.66 after an initial 0.3 to 75 hours, indicating that the ammonia fell far below the pH of 7.8 at the end of the reaction with sulfuric acid.

Table 2. Treatment Efficiency in Chemical Solution Reactor by Inflow Concentration of Ammonia Gas

Example 2. Comparison of Removal Rate of Ammonia by Retention Time in Chemical Solution Reactor

Changes in removal rate according to contact time with sulfuric acid were investigated in the concentration range of 200ppm where the concentration of ammonia gas is relatively high.

The inflow rate was fixed at 30 L / min and 65 L / min, and the ammonia removal rate was measured by changing the volume of 1N sulfuric acid. As a result of calculating the settling time using the ammonia gas flow rate and the volume of sulfuric acid, the removal rate of ammonia could be compared at 60, 40, 27, 20, 10, 5, 3. 1.5 seconds (Table 3). As a result, the concentration of effluent ammonia coming out of the chemical reaction tank from 60 seconds to 1.5 seconds was not detected at all (FIG. 3). This indicates that the general chemical liquid washing method may be reduced in size by more than six times as compared with the designed residence time of about 10 seconds.

Table 3. Removal rate of residence time of ammonia gas

Example 3 pH Measurement of Neutralization of Ammonia and Sulfuric Acid in a Chemical Reaction Tank

When ammonia gas is continuously injected into the chemical reaction tank 8 containing sulfuric acid, ammonia and sulfuric acid react, and the pH of sulfuric acid gradually increases. The reaction is neutralized at some point so that ammonia is no longer removed. The experiment was conducted to determine the timing of neutralization by concentrations of ammonia gas and sulfuric acid. The concentration of ammonia gas introduced was 30 ppm, and the total residence time in the reactor was fixed at 5 seconds. The concentration of sulfuric acid was applied to 0.1, 0.5, 1.0, 2.0N and the experimental results are shown in FIG.

When the ammonia gas reacted with the sulfuric acid solution, the pH of the sulfuric acid was gradually increased, and the pH of the sulfuric acid was no longer reacted from about 7.8, and it was confirmed that the gas was discharged to the outlet 11.

In other words, when the neutralization reaction is terminated near pH 7.8, when the pH of the chemical reaction tank 8 is maintained below, the incoming ammonia gas can be continuously removed. For this result, the pH of the chemical reaction tank was maintained at 4 to 5 using 1 N sulfuric acid using the pH controller 17.

Ammonia, of course, continued to react and showed complete removal over 5 months. Through this experiment, the concentration of sulfuric acid did not affect the removal rate and it was confirmed that the ability to neutralize ammonia, that is, the operation period.

The end of this neutralization reaction can be confirmed by the Congo red and phenolphthalein indicators, which are present in blue in acid and gradually turn dark orange with increasing pH. Experiments showed that discoloration occurred in the pH range of about 5. Pegphthalein is a colorless indicator in acid and red in alkali, and it can be seen that the pH is changed from pH 7.8. The result is that in the case of a system for automatically supplying a certain amount of chemical liquid, a method of intermittently adding the chemical liquid when the pH is increased to some extent using the pH controller 17 may be adopted. The color change of the indicator indicates that the drug's replacement cycle can be determined.

In addition, when using Congo red and phenolphthalein indicators, there is a difference in the point where the reaction is terminated in phosphoric acid, hydrochloric acid, hypochlorous acid, etc., but the color change can be confirmed before ammonia is discharged. Confirmed that it can.

Example 4. Comparison of Ammonia Removal Rate According to Kinds of Chemical Solution

Chemical solutions such as phosphoric acid, hydrochloric acid and hypochlorous acid other than sulfuric acid also react with ammonia.

A typical reactor operation is shown below.

2 NH ₃ + H ₂ SO ₄ → (NH ₄ ) ₂ SO ₄ (reactor of ammonia and sulfuric acid)

NH ₃ + H ₃ PO ₄ → NH ₄ H ₂ PO ₄ (reactor of ammonia and phosphoric acid)

NH ₃ + HCl → NH ₄ Cl (reactor for ammonia and hydrochloric acid)

2 NH ₃ + NaOCl → N ₂ + 3 NaCl + 3 H ₂ O (reactor for ammonia and hypochlorous acid)

This experiment is to confirm the removal of ammonia gas according to the type of chemical liquid. The concentration of the chemical liquid is maintained at 0.1 ~ 1N, the concentration of ammonia gas is 50ppm, and the odor stays in the reactor for 3 seconds. Experiment was set up.

The chemicals used in the experiments showed some differences, but were found to show excellent efficiency for the removal of ammonia even with a short residence time.

Table 4. Removal Efficiency According to Concentration by Chemical Solution for Treating Ammonia Gas

Example 5 Removal of Hydrogen Sulfide Gas in the Entire Reactor

When acid is added to the chemical reaction tank 8 and the mixed gas is treated, alkaline gas such as ammonia or amines shows excellent removal rate. However, odors such as hydrogen sulfide and methyl mercaptan, which are typical acid gases, are not easily removed. In order to process such untreated gas, a biofilter (biofilter) 16 was installed at the rear end, and the treatment efficiency of the composite gas was tested (FIG. 1). In the biofilter 16, organic carrier peatmoss, inorganic carrier perlite, and granular activated carbon were added in a volume ratio of 50:25:25 (v / v) as a microbial carrier (14). The sludge collected from the return sludge tank was used. The residence time of the incoming gas was maintained at 10 seconds based on the entire reactor, and the residence time at this time was maintained at 1.5 seconds in the chemical liquid reactor (8) and 8.5 seconds in the biofilter (16). The concentration of ammonia gas was processed to 200 ppm and the concentration of hydrogen sulfide gas was changed to 60 to 150 ppm. These results are shown in FIG. 200 ppm of ammonia gas was completely processed 100% throughout the experimental period in the chemical reaction tank (8) to which 1N sulfuric acid was added, and hydrogen sulfide gas was removed about 35% on average in the chemical reaction tank (8). In addition, the residual hydrogen sulfide gas that was not treated in the chemical reaction tank 8 was mostly removed through a biofilter 16, showing an average removal rate of more than 98%.

Of course, this result is due to prior research of the biofilter (16) prior to the present invention to secure the optimum microbial carrier and to maintain the appropriate moisture, pH, temperature in the biofilter (biofilter) 16 to increase the microbial activity It is also the result.

Example 6 Fabrication of Two Stage-single Reactor

This experiment is to modify the reactor so that the configuration of the experimental apparatus used in Example 5 can be applied to the actual site, the chemical reaction tank (8) and the untreated outside to react the odor components introduced into the inside of one reactor with the chemical solution The present invention relates to the construction of a two stags-single reactor configured to allow biologically removed odors to be removed by a microorganism attached to a carrier.

The device is manufactured in two forms, one of which is a bidirectional odor removal device as shown in FIG. 6. The reactor is composed of an outer cylinder and an inner cylinder, the chemical liquid reaction tank (8) containing the chemical liquid inside and the outer cylinder is filled with a carrier 14 for the biofilter (biofilter) 16, the carrier is both sides And the outflow gas is emitted in both directions. The shape of the reactor is designed to observe the inside well and has the advantage that it is easy to grasp the replacement cycle of the chemical through the indicator with the naked eye.

Another reactor type is a multi-directional outflow odor removing device as shown in FIG. 7, but the inside is the same as FIG. 6, but the outer cylinder is filled with a carrier for a biofilter (biofilter) 360 degrees. This type is difficult to observe inside, but because the biofilter carrier layer requires a longer residence time than the chemical reaction tank (8), the unnecessary space can be minimized, and a large amount of odor treatment system and automatic injection of chemical liquid A system that can be applied to a system. In addition, the above two reactor types are designed to be easy to move with a wheel on the bottom.

The odor removal device developed by the present invention can effectively and continuously remove various odors ranging from low concentration to high concentration.

In addition, even if the residence time of the reactor is very short, effective odor removal is achieved, and it is possible to make up for the shortcomings of the conventional chemical cleaning method and biofilter, and to minimize the economic loss and the generation of secondary pollutants due to the overuse of the chemical liquid. Technology. In addition, ammonium sulphate and ammonium phosphate, which are incidental to the treatment of high concentrations of ammonia gas, can be recycled as liquid fertilizers themselves, so there is no problem of secondary contaminated water treatment, and additional benefits can be expected.

Claims (8)

A method and apparatus for the removal of odor components by bubbling chemicals. A method for aeration in sulfuric acid, phosphoric acid, hydrochloric acid, hypochlorous acid and other acidic solutions for the removal of alkaline gases such as ammonia gas and amines, and such equipment. A method of aeration in caustic soda, hydrogen peroxide, hypochlorous acid and other alkaline solutions for the removal of acidic gases such as hydrogen sulfide and methyl mercaptan. A method of treating malodorous gases in a liquid phase by connecting one or more reactors in a liquid phase and biologically by microorganisms continuously attached to a carrier, and a device thereof. A method of using indicators such as Congo red and phenolphthalein to determine the replacement cycle of a solution (medical solution) to remove odor. Carrier used to biologically remove odor is a mixture of activated carbon, peatmoss, and perlite, and the compounding ratio thereof is 25:25:50 by volume. It relates to a facility in which the outlet of the device for removing odor is composed of a bidirectional outflow odor removal device as shown in FIG. It relates to a facility in which the outlet of the device for removing odor is composed of a multi-directional outflow odor removal device as shown in FIG.