• Advanced Composite Materials
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• 제17권3호
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• pp.235-246
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• 2008

This paper is concerned with geotextiles bonded chemically with geogrid to form a geocomposite. Geotextiles, thermally bonded and non-woven, play an important role as a separator. Also, this study investigates the resistance to the application environment of geotextile composites. Here, numerous tests have been performed and it was revealed from experimental results that thermally bonded geotextile in geosynthetic composites showed superior characteristics to that manufactured from needle punched non-woven method in terms of tensile strength, tensile strain and high separation performance. It was noted from experiments that the geotextile prepared for separation purpose and manufactured in a thermal bonding method showed relatively low permittivity so that it could be used as a smooth separator. In addition, PVA geotextile/HDPE geomembrane composites were designed and manufactured to investigate the waste landfill related properties. Numerous experiments have been performed and experimental results were summarized to evaluate practical applicability of PVA geotextile/HDPE geomembrane composites. Among the properties of proposed geomembrane composites, evaluation has been focused on the investigation of mechanical properties, AOS (apparent opening size), permittivity and ultraviolet stability.

• 한국토양비료학회지
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• 제14권2호
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• pp.83-87
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• 1981

산업폐물 비료자원(肥料資源)으로의 활용성(活用性)을 검토(檢討)하기 위(爲)하여 11업종(業種) 75개(個)공장(工場)의 폐기물을 수집분석(蒐集分析)한 결과(結果) 주당(酒精) 제지(製紙) 식품(食品) 및 섬유산업폐기물은 유기물질(有機物質) 및 비료(肥料) 성분(成分)을 많이 함유(含有)하고 중금속함량(重金屬含量)이 적어 비료자원(肥料資源)으로 유망시(有望視)되었다.

• 한국섬유공학회:학술대회논문집
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• 한국섬유공학회 2003년도 The Korea-Japan Joint Symposium
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• pp.85-86
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• 2003

Shrink-proofing processing of wool fabrics is practically carried out by means of oxidation of wool with choline and/or covering of wool surface with resins. But, these are not necessarily environmentally friendly process causing a waste fluid containing organic chlorine compounds. Development of alternative method using more environmentally friendly process is desired. In this study, utilization of titanium oxide, TiO$_2$, photocatalytic reaction for the shrink-proofing of wool has been examined. It was found that the treatment of wool by TiO$_2$ photocatalytic reaction gave good shrink-proofing characteristics to wool fabrics.

• 한국염색가공학회지
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• 제13권5호
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• pp.306-311
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• 2001

Natural colorants haute attracted much attention all over the world because of their non-hazardous nature. The world is becoming increasingly aware of environmental Issues, such as ozone layer depletion, water pollution and waste disposal problems. The use of synthetic dyestuffs for their synthesis and application in the dyeing industries has been criticized due to introduction of contaminants into the environment. This has led to the desire to turn to the traditional, and more natural way of life. In this study, the colorants of extract of Ginkgo biloba bark were analysed and their dyeing properties on silk, wool and cotton were studied. It was found that uv-visible absorption spectra of extract of Ginkgo biloba bark showed two strong absorption Peaks in the range of 240 ∼400 In. From the result of IR spectra, the major ingredient of extract of Gikgo biloba bark seems to be the flavon which is one of the flavonoid derivatives. Silk, wool, and cotton dyed with the extract of Ginkgo biloba bark showed a reddish yellow color. Their color differences were increased drastically with repetition of dyeing by three times.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 1995년도 춘계학술발표회 초록집
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• pp.60-68
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• 1995

This work wes performed to investigate the photocatalytic decolorization of waste water from textile industries. Methyl orange was used as a target dye with suspended Hombikat TiO$_2$ photocatalyst with a recirculating annular photoreactor. 1 wt % Pt-doped Hombikat thin film tubular reactor with parabolic reflector also wes usedin this experiment. The pH effect and flow rate effect on photobleaching of 0.012 g/l methyl orange solution, AtpH=3 Colour of methyl orange was completely bleached in 30 min with a 20 W UV lamp.

• Korean Chemical Engineering Research
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• 제55권6호
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• pp.837-845
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• 2017

D염색공단의 폴리에스테르 알카리 감량폐수 및 호발폐수가 혼합된 실제 종합염색폐수를 처리하기 위하여 D염색공단의 종합폐수처리장 반송슬러지를 고정한 폐타이어담체를 충전한 재순환 유동상 바이오필터와 소성된 $TiO_2$ 코팅-glass bead를 광촉매담체로 적용한 UV/광촉매반응기를 결합한 재순환 통합시스템을 구축하여 운전하였다. 그 결과로서 재순환 통합시스템의 총 $COD_{cr}$ 제거율과 총 색도 제거율 추이는 각각 약 81% 및 55% 정도를 유지하였다. 이러한 재순환 통합시스템의 총 $COD_{cr}$ 및 총 색도 제거율의 제고효과는 각각 최대 약 7% 및 3%로 평가되었다. 재순환 통합시스템의 유동상 바이오필터 및 광촉매반응공정은 총 제거율에 대한 상대기여도로서 각각 총 $COD_{cr}$ 제거율의 약 94% 및 6%를 처리하고, 총 색도 제거율의 약 86% 및 14%를 처리하였다. 이와 같이 재순환 통합시스템의 광촉매반응공정에서는 총 제거율에 대한 색도 제거율의 상대기여도가 $COD_{cr}$ 제거율의 상대기여도보다 약 2.4배 정도 컸다. 따라서 본 연구의 재순환 통합시스템에서 광촉매반응공정은 $COD_{cr}$ 제거보다 아조결합과 같이 염료에서 색을 나타내는 화학결합을 깨는 역할에 더욱 효율성이 있었다. 또한 본 연구의 재순환 통합시스템에서 각 단위공정들의 $COD_{cr}$ 및 색도 제거율이, 재순환 통합시스템의 총 $COD_{cr}$ 및 색도 제거율에 미치는 영향에 대한 모델식과 대수적 상관관계를 구하고 분석하였다.

• 한국의류산업학회지
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• 제4권1호
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• pp.79-85
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• 2002

To develope natural dyeing materials from the unused plant materials, we had several dyeing experiments to investigate the optimum conditions of dyeing fabrics with the waste grape juice. Dyeing experiments were done under different dyeing conditions of dyeing time, dyeing temperature, pH and concentration of dyebath and mordants which were treated after dyeing. Experimental fabrics were silk, cotton, ramie and hemp. Color difference(${\Delta}E$) and Munsell's HV/C of the dyed fabrics and color fastness of silk dyed fabrics to dry cleaning, washing, rubbing, perspiration and light were measured. The color differences of dyed experimental fabrics were very slightly increased with dyeing time and the color of dyed silk was light purple and the cotton, ramie and hemp was light red purple. The color differences of dyed experimental fabrics were decreased and the color became lighter with dyeing temperature increased. The color differences of dyed experimental fabrics were decreased and the color changed from light purple to blue with the pH of dyebath increased. The color differences of dyed experimental fabrics were slightly increased with the concentration of dyebath increased. The color of dyed fabric changed with the mordant treatment and were different among the experimental fabrics. On the whole, blue tone increased with the Al and Fe mordant and green tone increased with the Cu mordant. The color fastness of dyed silk fabrics to light, washing (change) and perspiration (change) was bad and color fastness to dry cleaning and rubbing were good.

• 한국의류산업학회지
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• 제23권3호
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• pp.406-414
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• 2021

This study aimed to evaluate the inhalation resistance(IR) and fiber structure of disposable masks when exposed to repeated heating and ultraviolet(UV) sterilization. The experiments consisted of a lab-scale and a field test. For the lab-scale test, KF94 and N95 masks were selected and a trial was composed of three repetitions of an 80-min sterilization. For the field test, a subject participated over four days, of which a KF94 was worn without sterilization, and the same trial was conducted during the next four days with daily sterilization. The results showed that the IR of the KF94 mask(9.5 Pa) gradually increased according to the sterilization up to the second repetition(15.6 Pa) but decreased at the third treatment(9.7 Pa). However, the N95 mask did not showany tendency of IR during the repetitions. Microscope photos showed several warped or blackened fibers in the stiffener layer after the repeated sterilization. After wearing a KF94 mask for four consecutive days, its IR decreased until the three days but increased the fourth day, whereas another KF94 mask with sterilization showed an increase in IR for the four days. In the microscope-photos after the consecutive four days, outside fibers and stiffener layers were warped or became less dense. In summary, the IR of the KF94 mask slightly increased through the three~four rounds of heating and UV sterilizations, but the fiber structures were not significantly deformed by the repeated sterilization. To reduce discarded mask waste, the repeated sterilization of masks can be recommended.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2003년도 가을 학술논문집
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• pp.101-104
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• 2003

저준위 방사성액체폐기물 처리방법으로 에너지 소모가 적은 경제적이고 효율적인 처리방법을 제시하기 위하여 면 과 Polyester 가 함유된 합성섬유를 증발매체로 하여 자연기상 상태의 건조한 공기를 유입하여 방사성 액체폐기물과 접촉시켜 증발하는 연구를 하였다. 본 연구에서는 자연상태의 공기를 강제 유입시켜 액체의 증발현상, 증발매체표면에서의 물질전달 등 이론을 토대로 방사성액체폐기물을 처리하는 연구를 수행하였다. 실험은 방사성폐액을 직접 사용하였으며, 증발에 영향을 미치는 변수에 따라 증발 단위 면적당 방사성 폐액의 증발량측정 및 제염계수를 조사하였다. 증발효과는 유입공기의 습도가 낮고 공기의 유속과 공급액의 유량이 증가하고 폐액의 온도가 높아질수록 증발량이 증가하였다. 실험결과 습도는 70% 이하, 공급폐액의 유량이 $3.4{\ell}/hr\cdotm^2$ 이상, 공기유속은 1.14~l.47 m/sec 범위가 조업조건이며, 이때 제염계수는 $5.1{\times}10^3$, 배출공기의 방사능 농도는 $4.7{\times}10^{-13}{\mu}Ci/\textrm{m}{\ell}{\cdot}air$로 측정되었다. 공급유량이 $4.6{\ell}/hr\cdotm^2$와 공기유속이 1.47 m/sec일때 최대 증발조건으로 확인되었으며 대기의 온.습도 및 풍속에 따른 실험을 통하여 달톤형의 증발식 Air factor $[\textit{Eh}=(0.018 + 0.0141\textitv) {\delta}textitH]$를 도출하였다.

• KSBB Journal
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• 제8권2호
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• pp.150-155
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• 1993

난분해성인 색소를 대사분해할 수 있는 미생물을 분리하여, 색소분해의 최적조건을 조사하였다. 미생물은 폐수처리공장의 폭기조에서 채취한 폐수로부터 agar media에서 순수분리하였다. 이 균주들을 glu­c cose, peptone, $Na_2HPO_45, KCI, MgSO_4, KH_2PO_4, NaCI, CaCI_2$와 dye(azo계, reactive red계 ) lOppm 을 함유한 액체 배지에서 dye의 분해력이 강하였으 며, 이때의 최적 pH는 중성 또는 약알칼리성이고, 최적 온도는 $30^{\circ}C$ 전후이다. 이 조건에서 10ppm의 m mono-azo(Lot No. 180), di-azo(Lot No. 138), re­a active red(Lot No.2)는 약 2일에 거의 분해되었고, di-azo(Lot No. 151), reactive red(Lot No. 34, L Lot No. 00166)는 약 5일에 거의 분해되었고, 최적 배지조건하에서 산소의 영향은 D.O를 50%로 유지 시켰을 경우보다 혐기성 배양의 경우가 reactive d dye(Lot No.2)의 분해도가 훨씬 높았다.