KR20010001446A - Cork medium for supporting microorganisms thereon useful in removing odor and organic volatile compounds, and preparation thereof - Google Patents

Cork medium for supporting microorganisms thereon useful in removing odor and organic volatile compounds, and preparation thereof Download PDF

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Publication number
KR20010001446A
KR20010001446A KR1019990020668A KR19990020668A KR20010001446A KR 20010001446 A KR20010001446 A KR 20010001446A KR 1019990020668 A KR1019990020668 A KR 1019990020668A KR 19990020668 A KR19990020668 A KR 19990020668A KR 20010001446 A KR20010001446 A KR 20010001446A
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South Korea
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cork
carrier
present
microorganisms
useful
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KR1019990020668A
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Korean (ko)
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KR100329832B1 (en
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권성현
권대용
성준용
조경이
윤운영
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신현주
엘지엔지니어링 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
    • B01D53/34—Chemical or biological purification of waste gases
    • B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
    • B01D53/84—Biological processes
    • B01D53/85—Biological processes with gas-solid contact
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61L—METHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS OR SURGICAL ARTICLES
    • A61L9/00—Disinfection, sterilisation or deodorisation of air
    • A61L9/01—Deodorant compositions
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2257/00—Components to be removed
    • B01D2257/70—Organic compounds not provided for in groups B01D2257/00 - B01D2257/602
    • B01D2257/708—Volatile organic compounds V.O.C.'s
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/02—Odour removal or prevention of malodour

Abstract

PURPOSE: A method for preparing a cork carrier and the cork carrier prepared by the method are provided, which cork carrier is for dipping microbes useful for removing unpleasant odor and organic volatile compounds. CONSTITUTION: The method comprises the steps of crashing natural cork; injecting the solution containing nutritive components for microbes into the crashed one; stirring the mixture of the solution and the crashed cork to distribute the nutritive components; drying the cork at 50-60 deg.C; pressing the dried one; and cutting the pressed one in the size of a diameter 2-10 mm. Preferably the pH of the solution containing nutritive components is 4.2-5.

Description

악취 및 유기 휘발성 화합물 제거에 유용한 미생물 담지용 코르크 담체 및 그의 제조방법{CORK MEDIUM FOR SUPPORTING MICROORGANISMS THEREON USEFUL IN REMOVING ODOR AND ORGANIC VOLATILE COMPOUNDS, AND PREPARATION THEREOF}Cork support for microorganisms useful for removing odors and organic volatile compounds, and a method for producing the same.

본 발명은 수질, 대기 또는 토양 중의 악취 및 휘발성 유기 화합물의 제거에 유용한 미생물 담지용 코르크 담체 및 그의 제조방법에 관한 것으로, 보다 상세하게는 분쇄한 코르크에 영양분 함유 용액을 주입한 후 압축가공하여 코르크의 표면적을 증대시킨 다음 적절한 크기로 절단함으로써 제조되는 미생물 담지용 코르크 담체에 관한 것이다.The present invention relates to a microorganism supporting cork carrier useful for the removal of odors and volatile organic compounds in water quality, air or soil, and more particularly, to a cork which is compressed and processed by injecting a nutrient-containing solution into the ground cork. The present invention relates to a microorganism supporting cork carrier prepared by increasing the surface area of the substrate and then cutting it to an appropriate size.

최근 악취 및 유기 휘발성 화합물(VOC: volatile organic compound)에 대한 법 규제의 강화로 인해 오염 물질 배출시설에 의무적으로 그의 처리시설을 부착하도록 되어 있으며, 현재 이용되고 있는 처리기술로는 주로 소각로와 촉매산화법, 활성탄 흡착법, 흡수법 등과 같은 기타 물리화학적 처리법이 있다. 그러나 이들 방법은 시설비가 많이 들고 운전비용 또한 높아 경제적으로 비효율적이고 대부분의 배출시설에 적합하지 않은 것으로 평가되고 있다.Due to the recent tightening of regulations on volatile organic compounds (VOCs), mandatory attachment of their treatment facilities to pollutant discharge facilities is currently incinerator and catalytic oxidation. And other physicochemical treatments such as activated carbon adsorption and absorption. However, these methods are considered to be economically inefficient and unsuitable for most emission facilities because they are expensive and have high operating costs.

이러한 종래 기술의 단점을 보안하기 위해 개발된 기술이 미생물을 이용한 처리 기술인데, 이 기술은 대부분의 악취 및 저농도의 VOC 처리에 매우 적합하다. 미생물 공정의 핵심 기술은 여과 담체에 있는데, 국내에서는 아직 적절한 미생물 공정이 초기 단계에 있어 나무껍질이나 토양 등을 담체로 사용하고 있으며, 이러한 처리 방법은 처리 효율이 낮고 시스템의 부피가 매우 커지는 단점이 있다.The technology developed to secure the disadvantages of the prior art is a treatment technology using a microorganism, which is very suitable for the treatment of most odor and low concentration of VOC. The core technology of the microbial process is in the filter carrier. In Korea, the proper microbial process is still in the early stages, and the bark or soil is used as the carrier. This treatment method has the disadvantage of low processing efficiency and very large system volume. have.

또한, 현재 유럽이나 미국에서 생물학적 공정을 위해 사용되고 있는 담체로는 제올라이트나 활성탄을 많이 쓰고 있으나, 이들 담체는 오래 사용하면 pH가 낮아져 자주 교체해야 하는 단점이 있다. 또한, 기존의 시스템은 처리 가스가 상대 습도가 낮아 반응기 내에서 분해활성화가 낮아 처리효율이 떨어지는 문제점도 가지고 있다.In addition, as a carrier currently used for biological processes in Europe or the United States, zeolite or activated carbon is used a lot, but these carriers have a disadvantage of frequent replacement due to low pH. In addition, the existing system also has a problem that the processing gas is low relative humidity, low decomposition activation in the reactor, the treatment efficiency is lowered.

따라서, 악취 및 VOC 처리를 위한 미생물 공정에 유용하게 사용할 수 있는 경제적이고 고효율적인 여과 담체의 개발이 절실히 요망되고 있다.Therefore, there is an urgent need for the development of an economical and highly efficient filtration carrier that can be usefully used in microbial processes for odor and VOC treatment.

따라서, 본 발명의 목적은, 상술한 종래의 문제점을 해결하여, 기존에 이용되고 있는 여과 담체보다 처리 효율이 높아 처리 시스템의 부피와 시설 설치비 및 운전비를 크게 줄일 수 있는 여과 담체를 제공하는데 있다.Accordingly, an object of the present invention is to solve the above-mentioned problems and to provide a filtration carrier which can significantly reduce the volume, facility installation cost, and operation cost of the treatment system due to higher treatment efficiency than conventionally used filtration carriers.

도 1은 본 발명에 따른 미생물 담지 코르크 담체를 60일 동안 BTX 처리에 사용한 후의 담체 표면에 대한 SEM(주사전자현미경) 사진이다.1 is a SEM (scanning electron microscope) photograph of the surface of the carrier after using the microorganism-supported cork carrier according to the present invention for 60 days BTX treatment.

상기 목적을 달성하기 위해, 본 발명에서는 분쇄된 코르크에 미생물에 대한 영양분을 함유하는 용액을 주입하고, 영양분이 분배된 코르크를 건조하고, 건조된 코르크를 압축가공한 후 절단하는 것을 포함하는, 악취 및 휘발성 유기 화합물의 제거에 유용한 미생물 담지용 담체의 제조방법을 제공한다.In order to achieve the above object, the present invention injects a solution containing nutrients for microorganisms into the crushed cork, drying the nutrient-distributed cork, compressing the dried cork and then cutting, malodor And it provides a method for producing a carrier for supporting microorganisms useful for the removal of volatile organic compounds.

또한, 본 발명에서는 상기 본 발명의 방법에 따라 제조된, 미생물 담지용 코르크 담체를 제공한다.In addition, the present invention provides a cork carrier for supporting microorganisms prepared according to the method of the present invention.

이하 본 발명을 보다 상세히 설명한다.Hereinafter, the present invention will be described in more detail.

본 발명의 코르크 담체는 기존의 담체로 사용되던 활성탄에 비해 밀도가 1/8배이고 표면적이 8배인 다공성 경량 담체로서, 미생물 담지시 수질, 대기 또는 토양 중의 악취 및 휘발성 유기 화합물을 제거하는데 유용하게 사용될 수 있다.Cork carrier of the present invention is a porous lightweight carrier having a density of 1/8 times and 8 times the surface area compared to the activated carbon used as a conventional carrier, and is useful for removing odors and volatile organic compounds in water, air, or soil when supporting microorganisms. Can be.

본 발명의 코르크 담체는 다음과 같이하여 제조할 수 있다.Cork carrier of the present invention can be prepared as follows.

우선, 천연 코르크를 적절한 크기로 분쇄한 다음, 분쇄된 코르크에 미생물이 증식하는데 바람직한 영양분 용액을 주입하며, 영양분의 주입은 영양분 용액과 코르크 분쇄물을 혼합교반하여 코르크 분쇄물에 영양분이 고루 분배되도록 함으로써 달성할 수 있다.First, the natural cork is ground to an appropriate size, and then the crushed cork is infused with a nutrient solution suitable for microorganisms to grow. This can be achieved by.

상기 영양분 용액은, 물에 미생물 증식에 적절한 농도의 미네랄 영양 성분을 필수적으로 포함하여 담체에 담지되는 미생물의 활성도를 높히고 난분해성 물질을 쉽게 제거할 수 있게 한다. 본 발명에 사용할 수 있는 미네랄 영양분 물질의 예로는 KH2PO4, K2HPO4, KNO3, NaCl, MgSO4, CaCl2, FeCl2, 및 기타 미량 원소 화합물, 예를 들면 H3BO3, MnCl2, CoCl2, ZnCl2, NiCl2, CuCl2, NaMoO4등이 있다. 이들 영양분 물질은 담지되는 미생물에 따라 적절한 농도로 조합하여 사용할 수 있다.The nutrient solution essentially contains mineral nutrients at a concentration suitable for microbial growth in water to increase the activity of the microorganisms supported on the carrier and to easily remove hardly decomposable substances. Examples of mineral nutrient materials that can be used in the present invention include KH 2 PO 4 , K 2 HPO 4 , KNO 3 , NaCl, MgSO 4 , CaCl 2 , FeCl 2 , and other trace element compounds such as H 3 BO 3 , MnCl 2 , CoCl 2 , ZnCl 2 , NiCl 2 , CuCl 2 , NaMoO 4, and the like. These nutrient substances may be used in combination at appropriate concentrations depending on the microorganisms to be supported.

본 발명에 따르면, 영양분 용액의 pH는 4.2 내지 5 범위로 조정하는 것이 바람직하며, pH의 조정은 산 또는 알칼리를 사용하여 수행할 수 있다.According to the present invention, the pH of the nutrient solution is preferably adjusted in the range of 4.2 to 5, and the pH can be adjusted using an acid or an alkali.

영양분이 코르크에 적절히 분배된 다음, 코르크를 50 내지 60 ℃의 온도에서 건조하고, 건조된 코르크를 압축가공한 후 직경 2 내지 10 mm의 크기로 절단하여, 본 발명의 코르크 담체를 제조할 수 있다.Nutrients are properly distributed in the cork, and then the cork is dried at a temperature of 50 to 60 ℃, the dried cork is compressed and cut into a size of 2 to 10 mm in diameter to prepare a cork carrier of the present invention. .

본 발명의 코르크 담체는 코르크를 주요 매질로 사용하므로 미생물이 성장할 수 있는 최적의 조건을 제공하여 미생물 적응도(acclimation)가 빠를 뿐 아니라 미생물 대사 작용에 의하여 발생하는 산에 대해 내산성이 강해 빈번한 교체가 필요없어 (교체주기가 대략 5 내지 8년 정도) 매우 경제적이다.Cork carrier of the present invention uses the cork as the main medium to provide the optimum conditions for the growth of microorganisms not only fast acclimation of microorganisms but also strong acid resistance to acid generated by microbial metabolism, frequent replacement It is not economical (about 5-8 years of replacement cycles) and very economical.

대기, 수질 또는 토양 중의 악취 또는 VOC의 제거를 위해 본 발명의 코르크 담체에 담지되는 미생물은, 당해 분야에서 그러한 용도에 사용할 수 있는 것으로 공지된 모든 미생물을 사용할 수 있다.Microorganisms carried on the cork carrier of the present invention for the removal of odors or VOCs in the air, water or soil can use any microorganism known in the art that can be used for such use.

본 발명의 코르크 담체를 사용하여 처리할 수 있는 악취 또는 VOC의 대표적인 예로는 벤젠, 톨루엔, 자일렌 등과 같은 방향족 성분과 이소프로필 알콜과 같은 알콜 성분, 황 화합물, 질소 화합물 등이 있으며, 이들에 대한 본 발명 코르크 담체의 처리 효율은 대략 85% 이상으로 매우 높다.Representative examples of malodors or VOCs that can be treated using the cork carrier of the present invention include aromatic components such as benzene, toluene, xylene, and alcohol components such as isopropyl alcohol, sulfur compounds, nitrogen compounds, and the like. The treatment efficiency of the cork carrier of the present invention is very high, approximately 85% or more.

본 발명의 코르크 담체는 수질, 대기 또는 토양 처리 공정의 적절한 위치에서 이용할 수 있으며, 예를 들면 하수 처리장, 산업체 폐수처리장, VOC 배출 시설, 축산 분뇨 처리시설, 쓰레기 배립지역, 음식물 퇴비화 시설, 각종 산업체 환기 시설, 토양오염 처리공정에 유용하게 적용할 수 있다. 본 발명의 코르크 담체는 상용화된 세라믹 담체의 60 내지 30 %의 가격으로 제조가 가능하며 통기성, 내구성, 내산성, 보습성 등이 탁월하다. 또한, 본 발명의 코르크 담체는 경량 바이오 필터 시스템을 구현하여, 기존의 구조물에 추가 설치하는 경우 실내외 어디에 설치하더라도 구조물 부하에 큰 영향을 미치지 않아 시공이 용이하다.The cork carrier of the present invention can be used at a suitable location of water quality, air or soil treatment process, for example, sewage treatment plant, industrial wastewater treatment plant, VOC discharge facility, livestock manure treatment facility, waste disposal area, food composting facility, various industries It can be usefully applied to ventilation facilities and soil pollution treatment processes. Cork carrier of the present invention can be produced at a price of 60 to 30% of commercially available ceramic carriers and excellent in breathability, durability, acid resistance, moisture retention, and the like. In addition, the cork carrier of the present invention implements a lightweight biofilter system, and when additionally installed in an existing structure, the cork carrier may be easily installed because it does not significantly affect the structure load even when installed indoors or outdoors.

이하 본 발명을 실시예에 의해 설명하며, 본 발명이 이에 국한되는 것은 아니다.Hereinafter, the present invention will be described by way of examples, but the present invention is not limited thereto.

실시예 1: 미생물이 담지된 코르크 담체의 제조Example 1 Preparation of Cork Carrier Supported by Microorganisms

물에 KH2PO41.0 내지 1.3 g/L, K2HPO41.0 내지 1.5 g/L, KNO31.0 내지 1.5 g/L, NaCl 0.2 내지 0.5 g/L, MgSO40.02 내지 0.05 g/L, CaCl20.02 내지 0.05 g/L 및 기타 미량 원소 화합물로서 FeCl24H2O 1.5 g/L, H3BO30.06 g/L, MnCl24H2O0.1 g/L, CoCl26H2O 0.12 g/L, ZnCl20.07 g/L, NiCl26H2O 0.025 g/L, CuCl22H2O 0.015 g/L, NaMoO42H2O 0.025 g/L 및 EDTA 약 26 g/L가 용해되어 있고 pH가 4.2로 조정된 수용액을, 적절한 크기로 분쇄된 천연 코르크에 상기 수용액과 상기 코르크 분쇄물의 중량비 1:2의 비율로 혼합하여 교반하였다. 생성된 코르크 혼합액을 50 내지 60 ℃의 온도에서 건조하고, 건조된 코르크 분쇄물을 압축가공한 후 직경 2 내지 10 mm의 크기로 절단하여, 본 발명의 코르크 담체를 제조하였다.KH 2 PO 4 1.0 to 1.3 g / L, K 2 HPO 4 1.0 to 1.5 g / L, KNO 3 1.0 to 1.5 g / L, NaCl 0.2 to 0.5 g / L, MgSO 4 0.02 to 0.05 g / L, CaCl 2 0.02 to 0.05 g / L and other trace element compounds FeCl 2 4H 2 O 1.5 g / L, H 3 BO 3 0.06 g / L, MnCl 2 4H 2 O0.1 g / L, CoCl 2 6H 2 O 0.12 0.07 g / L g / L, ZnCl 2 , 0.025 g / L NiCl 2 6H 2 O, 0.015 g / L CuCl 2 2H 2 O, 0.025 g / L NaMoO 4 2H 2 O and about 26 g / L EDTA The aqueous solution whose pH was adjusted to 4.2 was mixed and mixed with natural cork ground to an appropriate size in a ratio of 1: 2 by weight ratio of the aqueous solution and the cork grind. The resulting cork mixture was dried at a temperature of 50 to 60 ° C., and the dried cork pulverized compact was cut to a size of 2 to 10 mm in diameter to prepare a cork carrier of the present invention.

상기 코르크 담체에 하수 슬러지를 1 L/m3의 양으로 흡착시켜 슬러지에 존재하는 혼합 미생물이 담지된 코르크 담체를 수득하였다.Sewage sludge was adsorbed to the cork carrier in an amount of 1 L / m 3 to obtain a cork carrier carrying mixed microorganisms present in the sludge.

실시예 2: BTX 제거 시험Example 2: BTX Removal Test

상기 실시예 1에서와 같이 제조된 미생물 담지된 코르크 담체의 BTX(벤젠, 톨루엔 및 자일렌)에 대한 제거 효율을 선행 기술에 따른 제올라이트 및 활성탄과 비교하기 위해, BTX를 150 ppmv 함유하는 수용액을 2.5 내지 10 L/분의 유속으로 각 담체에 60일 동안 통과시킴으로써 처리(온도 26 ℃ 및 pH 7)하여 60일 후의 제거능(elimination capacity) 및 제거 효율(removal efficiency)을 측정하였으며, 그 결과를 하기 표 1에 나타내었다.In order to compare the removal efficiency of BTX (benzene, toluene and xylene) of the microorganism-supported cork carrier prepared as in Example 1 with the zeolite and activated carbon according to the prior art, an aqueous solution containing 150 ppmv of BTX was added. 60 days after the treatment (temperature 26 ℃ and pH 7) by passing through each carrier at a flow rate of 10 L / min to determine the elimination capacity (removal capacity) and removal efficiency (removal efficiency) after 60 days, the results are shown in the following table 1 is shown.

표 1에서 알 수 있듯이, 본 발명의 코르크 담체를 사용하면 선행 기술의 제올라이트 또는 활성탄 담체에 비해 BTX 처리 효율이 약 20% 이상 높으며, 제거능 또한 현저히 높아, 적은 양으로도 많은 오염 물질을 처리할 수 있다.As can be seen from Table 1, when the cork carrier of the present invention is used, the BTX treatment efficiency is about 20% or more higher than that of the zeolite or activated carbon carrier of the prior art, and the removal ability is also significantly high. have.

또한, 상기 60일 동안의 BTX 처리에 사용한 후 코르크 담체의 표면을 SEM(주사전자현미경)으로 분석하였으며, 그 결과를 도 1에 나타내었다. 도 1을 참조하면, 미생물이 담지된 코르크 표면에 BTX에 순양된 많은 미생물이 성장해 있는 것을 알 수 있다.In addition, after using the BTX treatment for 60 days, the surface of the cork carrier was analyzed by SEM (scanning electron microscope), and the results are shown in FIG. Referring to FIG. 1, it can be seen that many microorganisms cultivated in BTX are grown on the cork surface on which microorganisms are supported.

실시예 3: 알콜 제거 시험Example 3: Alcohol Removal Test

상기 실시예 1에서와 같이 제조된 본 발명의 여과 담체의 알콜에 대한 제거 효율을 선행 기술에 따른 제올라이트 및 활성탄과 비교하기 위해, 이소프로필 알콜(IPA)을 50 ppmv 함유하는 수용액을 10 L/분의 유속으로 각 담체에 60일 동안 통과시켜 처리(온도 26 ℃ 및 pH 7)하였으며, 60일 후의 제거 효율(removal efficiency)을 측정하였다. 측정 결과를 하기 표 2에 나타내었다.In order to compare the removal efficiency of the filter carrier of the present invention prepared as in Example 1 with the zeolite and activated carbon according to the prior art, an aqueous solution containing 50 ppmv of isopropyl alcohol (IPA) was 10 L / min. The carriers were treated by passing through each carrier for 60 days at a flow rate of (26 ° C. and pH 7), and the removal efficiency after 60 days was measured. The measurement results are shown in Table 2 below.

표 2로부터, 본 발명의 코르크 담체는 선행 기술의 제올라이트 또는 활성탄 담체 보다 현저히 높은 IPA 제거효율을 가짐을 알 수 있다.Table 2 shows that the cork carrier of the present invention has a significantly higher IPA removal efficiency than the zeolite or activated carbon carriers of the prior art.

본 발명에 따른 코르크 담체는 미생물 담지시 악취 및 VOC의 제거에 매우 높은 제거 효율과 제거능으로 사용할 수 있어, 폐기물 처리 시스템의 부피와 시설 설치비 및 운전비를 크게 줄일 수 있다.Cork carrier according to the present invention can be used with very high removal efficiency and removal ability to remove odors and VOCs when supporting microorganisms, it is possible to significantly reduce the volume and installation cost and operating cost of the waste disposal system.

Claims (5)

분쇄된 코르크에 미생물에 대한 영양분을 함유하는 용액을 주입하고, 영양분이 분배된 코르크를 건조하고, 건조된 코르크를 압축가공한 후 절단하는 것을 포함하는, 미생물 담지용 코르크 담체의 제조방법.Injecting a solution containing nutrients for microorganisms in the crushed cork, drying the nutrient-distributed cork, compressing the dried cork, and then cutting the cork carrier for supporting microorganisms. 제 1 항에 있어서,The method of claim 1, 영양분 용액이 pH 4.2 내지 5로 조정된 것임을 특징으로 하는 방법.Wherein the nutrient solution is adjusted to pH 4.2-5. 제 1 항에 있어서,The method of claim 1, 코르크의 건조를 50 내지 60 ℃에서 수행하는 것을 특징으로 하는 방법.Drying of the cork is carried out at 50 to 60 ℃. 제 1 항에 있어서,The method of claim 1, 직경 2 내지 10 mm의 크기로 절단되는 것을 특징으로 하는 방법.Method to be cut to a size of 2 to 10 mm in diameter. 제 1 항 내지 제 4 항 중의 어느 한 항의 방법에 의해 제조된 미생물 담지용 코르크 담체.The microorganism supporting cork carrier manufactured by the method of any one of Claims 1-4.
KR1019990020668A 1999-06-04 1999-06-04 Method of removing odor and organic volatile compounds using cork medium KR100329832B1 (en)

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