KR101780126B1

KR101780126B1 - Media for removing odor

Info

Publication number: KR101780126B1
Application number: KR1020150185004A
Authority: KR
Inventors: 정헌회; 강광남; 허문수
Original assignee: 에이티이 주식회사
Priority date: 2015-12-23
Filing date: 2015-12-23
Publication date: 2017-09-20
Also published as: KR20170075868A

Abstract

A malodor removing medium is disclosed. The disclosed malodor removing medium is a malodor removing medium for removing sulfur compounds and nitrogen compounds contained in malodorous matter. The malodor removing medium comprises 20 to 25% by weight of cellulose, 40 to 60% by weight of calcium carbonate, 5 to 10% by weight of magnesium carbonate and 10 to 32% 0.1 to 3 W%, and nutrients of 0.5 to 1 W%.

Description

{MEDIA FOR REMOVING ODOR}

The present invention relates to a medicament for removing odor, and more particularly, to a medicament for removing odorous odor by removing hydrogen sulfide (sulfur compound) and ammonia (nitrogen compound) by a chemical reaction of iron hydroxide and a bioreactor using a sulfated microorganism and nitrifying and denitrifying microorganisms This is for a pallet-type odor removal medium.

In the livestock wastewater treatment plant, the manure treatment plant, the sewage treatment plant, and various industrial fields, complaints of the residents of the neighborhood are increasing due to the odor which is mainly composed of hydrogen sulfide and ammonia. In particular, due to the expansion of the city, residential complexes have been built around the existing treatment plant and industrial complex, and complaints about odor are increasing.

The odor components generated are composed of complex odor inducing sources, and the components generating the complaints are sulfur compounds and nitrogen compounds. The sulfur compounds are mainly composed of hydrogen sulfide, methyl mercaptan, methyl sulfide, and methyl disulfide. Among them, hydrogen sulfide occupies the largest amount. The nitrogen compounds are composed of ammonia, methylamine, dimethylamine and trimethylamine Generally, the composition ratio of ammonia is the highest.

The odor is the smell that the irritating gaseous substance stimulates the smell of the human body and gives offensive and disgusting odor.

Methods for removing ammonia and other odor components can be divided into physicochemical methods and biological methods.

Among them, the water washing method is a method of dissolving a malodor causing material in water and deodorizing it, so that it is not possible to remove non-polar malodor causing material which does not dissolve in water, and there is a problem of reprocessing contaminated water after removing the malodor inducing material. The chemical solution cleaning method is the most common method using physical absorption method and chemical reaction, and ammonia and the like are reacted with acidic chemicals to remove them as a salt compound, but the stability and secondary pollution countermeasures for chemicals used must be accompanied. The ozone oxidation method, which is one of the oxidation methods, is a method of oxidizing and decomposing odorous substances using ozone oxidation. It is applied to ammonia and lower amines, but it has a sterilizing effect against microorganisms, fungi or viruses, Secondary pollution countermeasures such as human health of ozone are needed and it is necessary to review the power cost and maintenance technology in operation.

Chemical Oxidation The chemical oxidation method using oxidizing agents (chlorine dioxide, sodium hypochlorite, chlorite dioxide) is a method of oxidizing and decomposing odorous substances, which can effectively remove various kinds of odors. However, There is a problem that the oxidizing agent itself causes environmental pollution.

In addition, the combustion method is a method of oxidizing and decomposing a malodor causing material into heat at a high temperature, and is effective when the concentration is high or complex. However, it is disadvantageous that the initial investment cost is high and the cost is high when the low concentration odor causing substance is removed. The adsorption method using activated carbon has been widely applied to low - concentration odor components, but it has disadvantages such as high replacement cost.

Biological methods for decomposing odor-causing substances using microorganisms have the drawbacks of heavy construction costs and operating conditions, but they are effective in eliminating odor, easy to maintain and manage, and low in running costs.

It is an object of the present invention to provide a medicament for removing malodors that can remove both sulfur compounds and nitrogen compounds, thereby exhibiting high odor removal efficiency and high odor removal efficiency even in a source of bad odor due to high moisture content.

In order to attain the above object, the malodor removing medium of the present invention comprises 20 to 25 wt% of cellulose, 40 to 60 wt% of calcium carbonate, 5 to 10 wt% of magnesium carbonate, And 10 to 32 wt% of iron hydroxide, 0.1 to 3 wt% of manganese oxide, and 0.5 to 1 wt% of nutrients.

The malodor removing medium may be configured to be manufactured in a pellet form.

According to the above description, the medium of the present invention is composed of cellulose, calcium carbonate, magnesium carbonate, iron hydroxide, manganese oxide, and nutrients, and can remove the sulfur compounds and the nitrogen compounds together.

In addition, the present invention has a high porous structure due to cellulose, and thus has a high odor removal efficiency even in a bad odor generating source of high relative humidity.

In addition, since the malodor removing medium of the present invention contains nutrients, microorganisms that grow naturally through high surface area can be grown, and odor can be removed by microorganisms.

In addition, the malodor removing medium of the present invention removes sulfur compounds through a chemical reaction with sulfur compounds in the malodor, and when the removal efficiency is lowered, oxygen can be supplied to recover the sulfur compound removal performance and reuse.

1 is a schematic diagram of experimental equipment for testing the treatment efficiency of the malodor removing medium of the present invention,
FIG. 2 is a graph showing the hydrogen sulfide removal efficiency of the malodor removing medium according to the present invention, and FIG. 3 is a graph showing the removal efficiency of the malodor removing medium of the present invention A graph showing the ammonia removal efficiency of the medium.

BRIEF DESCRIPTION OF THE DRAWINGS The above and other objects, features, and advantages of the present invention will become more readily apparent from the following description of preferred embodiments with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described herein but may be embodied in other forms. Rather, the embodiments disclosed herein are provided so that the disclosure can be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

In describing the specific embodiments below, various specific details have been set forth in order to explain the invention in greater detail and to assist in understanding it. However, it will be appreciated by those skilled in the art that the present invention may be understood by those skilled in the art without departing from such specific details. In some instances, it should be noted that portions of the invention that are not commonly known in the description of the invention and are not significantly related to the invention do not describe confusing reasons to explain the present invention.

The malodor removing medium of the present invention is for removing sulfur compounds and nitrogen compounds present in malodorous matter and is composed of cellulose, calcium carbonate, magnesium carbonate, iron hydroxide, manganese oxide, and nutrients.

Cellulose has a porous fiber structure, which is lightweight and has a high specific surface area as well as a durability as a media support. In this case, a carbonate such as calcium carbonate and magnesium carbonate was added to remove the acid generated during ammonia removal, hydroxide (Fe (OH) ₃ ) particles were added to remove the chemical compound, Salts were added.

The malodor removing medium of the present invention is prepared by mixing cellulose, calcium carbonate, magnesium carbonate, iron hydroxide, manganese oxide, and nutrient salts, molding them into a specific shape according to the application, and processing and drying the molded product.

In the present invention, the form of the odor-removing medium is a palatal type having a diameter of 4 to 13 mm and a length of 20 to 60 mm. The color of the appearance is brown, and the pH is 8 to 9 and slightly alkaline.

In order to secure proper pore and surface area of the medium for removing odor and to remove the sulfur compounds and nitrogen compounds and to improve the odor removal efficiency, the present invention is not limited to a specific composition range of cellulose, calcium carbonate, magnesium carbonate, iron hydroxide, manganese oxide, An effect suitable for the purpose of the invention can be obtained.

To this end, the malodor removing medium of the present invention comprises 20 to 25 wt% of cellulose, 40 to 60 wt% of calcium carbonate, 5 to 10 wt% of magnesium carbonate, 10 to 32 wt% of iron hydroxide, 0.1 to 3 wt% of manganese oxide, .

Specifically, the odor-removing medium of the present invention may be prepared by mixing the above-mentioned compositions, shaping the mixed composition to suit the application, processing the molded product, and drying the resulting mixture to finally remove odor-removing media Filter material).

Cellulose in the media composition not only maintains high porosity but also retains a certain amount of water and forms a support to which nitrifying and denitrifying microorganisms can adhere.

Among the main odor components, hydrogen sulfide reacts with iron hydroxide, which is a media composition, to form a reactant (FeS), and the reaction formula thereof is as follows.

2Fe (OH) ₃ + 3H ₂ S --------> 2FeS + S + 6H ₂ O

At the same time as this chemical reaction, the hydrogen sulfide is oxidized by the sulfated bacteria living in the medium, which is made by using residual oxygen present in the odor.

H ₂ S + 0.5 O ₂ --------> S + H ₂ O

H ₂ S + ₂ O ₂ --------> H ₂ SO ₄

The lifetime of the media is closely related to the concentration of incoming hydrogen sulphide, and should be replaced when the reaction with iron is no longer possible. However, this technology can restore the ability to remove hydrogen sulfide from the malodor removing media of the desulfurization media by continuously supplying air (or oxygen) at the front of the malodor removing apparatus, and the reactor is expressed as follows.

_{2FeS + 1.5O 2 + 3H 2 O} ------> 2Fe (OH) 3 + 2S

In addition, ammonia in the odor component reacts with moisture to become ammonia ion, and it is converted into nitrite nitrogen (NO ₂ ^- N) and nitrate nitrogen (NO ₃ ^- N) again by nitrifying microorganisms under aerobic conditions. Nitrosomonas (Nitrobacter), a chemically independent nutrient microorganism, uses ammonia as an energy source and its reaction formula is as follows.

NH ₃ + H ^{+ -} & gt ^; NH ₄ ⁺

2NH ₄ ⁺ + 3O ₂ ? 2NO ₂ ^- + 2H ₂ O + 4H ⁺

_{^{_{2NO 2 - + O 2 → 2NO}}} 3 -

As a result, the acid generated in the ammonia removal process is consumed by reacting with the carbonate, which is a medicinal composition. At this time, the medium having the reduced ammonia removal efficiency is classified as general waste and buried.

_{^{2CaCO 3 + 3H + → 2Ca 2}} + + HCO 3 - + H 2 CO 3

If the medium is used to remove ammonia from the biogas, the use of CO ₂ as an inorganic carbon source as an energy source of the nitrifying microorganism has the advantage of increasing the methane content in the biogas.

The odor introduced to induce the reaction of the nitrifying microorganism should contain at least 1% of sufficient oxygen. If not sufficient, separate supply facilities should be established.

The oxygen supplied with the growth of the nitrifying microorganisms is consumed and the upper part of the reaction tank becomes anaerobic condition with no oxygen and the chemical independent nutrient denitrifying microorganism grows. The nitrate nitrogen is converted to nitrogen molecule (N ₂ ) and nitrous oxide (N ₂ O) by denitrifying microorganisms.

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

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

^{2NO + 2H + + 2e - →} N 2 O + H 2 O

N ₂ O + 2H ⁺ + 2e ^- & gt ^; N ₂ + H ₂ O

In addition, the manufactured odor removing medium can attain a high removal efficiency even if a malodor having a relative humidity of 98% or more is introduced, because it can maintain a high water content due to the composition of the media composed of a cellulose support . The high moisture content thus formed also forms the growth conditions for nitrifying and denitrifying microorganisms. If the relative humidity of the incoming odor is low, water sprinklers should be installed on the top of the reactor to maintain sufficient moisture.

In addition, the added micro nutrient salts can increase microbial growth efficiency as a nutrient for allowing microorganisms to grow in the medium.

In addition, a small amount of manganese oxide added removes hydrogen sulfide by chemical reaction.

In order to investigate the treatment efficiency of the malodor removal media, the following experiment was conducted.

A maltose having a composition ratio of 20 to 25 W% of cellulose, 40 to 60 W% of calcium carbonate, 5 to 10 W% of magnesium carbonate and 10 to 32 W% of iron hydroxide, 0.1 to 3 W% of manganese oxide and 0.5 to 1 W% of nutrients, The removal medium was filled in the reaction tower.

At this time, the size of the reaction tank is 800mm * 1000mmH, and odor containing hydrogen sulfide and ammonia is introduced by the blower. A perforated plate was installed at the bottom so that the odor was uniformly distributed, and the air passing through the media was discharged through the upper outflow pipe. To investigate the odor removal efficiency, the concentrations of hydrogen sulfide and ammonia in the inlet and outlet of the reaction tower were measured and compared.

FIG. 2 is a bar graph showing the treatment efficiency of the sulfur compound through the experimental apparatus of FIG. 1, and FIG. 3 is a bar graph showing the treatment efficiency of the nitrogen compound (ammonia) through the experimental apparatus of FIG.

As shown in Fig. 2, in the first measurement, hydrogen sulfide of the influent odor was 85, and hydrogen sulfide 0.02 was measured in the exhaust odor passed through the malodor removing medium of the present invention. In the second measurement, the hydrogen sulfide of the incoming odor was measured to be 55, and the hydrogen sulfide of the discharged odor to be 0.06, and in the third measurement, the hydrogen sulfide of the incoming odor was 36 and the hydrogen sulfide of the exhaust odor was 0.05. As described above, the malodor removing medium of the present invention was confirmed to exhibit high hydrogen sulfide treatment efficiency as seen from a plurality of experimental values.

In addition, as shown in FIG. 3, in the first measurement, the ammonia of the incoming odor is 3, the ammonia of the exhaust odor is 0.1, the ammonia of the incoming odor is 5, the ammonia of the exhaust odor is 0.18 in the second measurement, Ammonia in the incoming odor was measured to be 2.5, and ammonia in the exhaust odor was measured to be 0.05. As described above, the malodor removing medium of the present invention was confirmed to exhibit high ammonia treatment efficiency as seen from a plurality of experimental values.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It will be understood by those skilled in the art that many changes and modifications of the present invention can be made without departing from the spirit and scope of the appended claims. Accordingly, all such appropriate modifications and changes, and equivalents thereof, should be regarded as within the scope of the present invention.

Claims

A medium containing 20 to 25% by weight of cellulose, 40 to 60% by weight of calcium carbonate, 5 to 10% by weight of magnesium carbonate and 10 to 32% by weight of iron oxide, 0.1 to 3% by weight of manganese oxide, 0.5 to 1 wt% of nutrients are mixed and molded into a pellet form, followed by drying.

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