• Title, Summary, Keyword: color removal

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Video Haze Removal Method in HLS Color Space (HLS 색상 공간에서 동영상의 안개제거 기법)

  • An, Jae Won;Ko, Yun-Ho
    • Journal of Korea Multimedia Society
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    • v.20 no.1
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    • pp.32-42
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    • 2017
  • This paper proposes a new haze removal method for moving image sequence. Since the conventional dark channel prior haze removal method adjusts each color component separately in RGB color space, there can be severe color distortion in the haze removed output image. In order to resolve this problem, this paper proposes a new haze removal scheme that adjusts luminance and saturation components in HLS color space while retaining hue component. Also the conventional dark channel prior haze removal method is developed to obtain best haze removal performance for a single image. Therefore, if it is applied to a moving image sequence, the estimated parameter values change rapidly and the haze removed output image sequence shows unnatural glitter defects. To overcome this problem, a new parameter estimation method using Kalman filter is proposed for moving image sequence. Experimental results demonstrate that the haze removal performance of the proposed method is better than that of the conventional dark channel prior method.

Electrochemical Oxidation of Textile Wastewater by Ru$O_{2}$/Ti Anode (Ru$O_{2}$/Ti 전극에 의한 염색폐수의 전기화학적 산화처리)

  • 김탁현;박철환;배우근;신응배;김상용
    • Textile Science and Engineering
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    • v.38 no.7
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    • pp.366-372
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    • 2001
  • The characteristics of electrochemical oxidation of textile wastewater by RuO$_2$/Ti electrode were studied. Operation parameters such as current density, electrolyte concentration, organics concentration in solution, types of electrolyte, and material of anode were selected and their effects on COD removal, color removal, and current efficiency(EOI) were investigated. COD removal showed a first-order reaction kineties. COD and color removal of textile wastewater were proportional to current density and electrolyte concentration, respectively, but disproportional to organics concentration. Especially, COD removal color removal, and current efficiency were highly improved by appling electrolytes containing Cl$^{[-10]}$ ions such as NaCl and KCl. In addition, RuO$_2$/Ti anode was relatively more effective than Pt/Ti anode for COD removal, color removal, and current efficiency.

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Isolation and Charaterization of Dye-Degrading Microorganisms for Treatment of Chromaticity Contained in Industrial Dyeing Wastewater (염색공단폐수의 색도처리를 위한 염료분해 균주의 분리와 특성)

  • Kim, Jung Tae;Park, Guen Tae;Lee, Geon;Kang, Kyeong Hwan;Kim, Joong Kyun;Lee, Sang Joon
    • Journal of Environmental Science International
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    • v.23 no.1
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    • pp.129-142
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    • 2014
  • To treat chromaticity contained in effluents of dyeing wastewater efficiently, potent dye-degrading microorganisms were isolated from influent water, aeration- tank sludge, recycle water and settling-tank sludge located in leather and dyeing treatment plant. Six potent strains were finally isolated and identified as Comamonas testosteroni, Methylobacteriaceae bacterium, Stenotrophomonas sp., Kluyveromyces fragilis, Ascomycetes sp. and Basidiomycetes sp. When Basidiomycetes sp. was inoculated into ME medium containing basal mixed-dyes, 93% of color was removed after 8 days incubation. In the same experiment, the 1:1 mixed culture of Basidiomycetes sp. and photosynthetic bacterium exhibited 88% of color removal; however, it showed better color removal for single-color dyes. The aeration-tank and settling-tank samples revealed higher color removal (95-96%) for black dyes. The settling-tank sample also revealed higher color removal on basal mixed-dyes, which resulted in 90% color removal after 6-h incubation. From the above results, it is expected to achieve a higher color removal using the mixed microorganisms that were isolated from aeration-tank and settling-tank samples.

Eveluation of Comparable Removal Efficiency of Organics and Color for the Dyeing Wastewater by Fenton Oxidation and Ozonation (펜톤산화와 오존산화 조합에 따른 염색폐수의 유기물질 및 색도 처리효율 비교 평가에 관한 연구)

  • Kim, Sun Hee;Lee, Sang Ho
    • Journal of Korean Society of Water and Wastewater
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    • v.18 no.6
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    • pp.778-784
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    • 2004
  • Dyeing wastewater contains recalcitrant organics which can not be easily treated by conventional biological treatment. Therefore it has to be treated by other advanced oxidation process in order to remove COD and Color more efficiently. Fenton oxidation process is one of the most commonly applied processes in removal of COD and color for the dyeing wastewater. However it increase the treatment cost and the production of sludge by the use of the excessive chemical reagent. Ozonation is not suitable in Single treatment process because it is not effective in organics removal compared with Color removal. The purpose of this research in order to evaluate the comparable removal efficiency of COD and color by the combination of advanced oxidation processes for the dyeing wastewater. The sequential treatment processes of Fenton process and ozonation was more effective to remove organics and color than ozonation and Fenton process. The result of Fenton process for the pretreatment presented as the 81% removal of organics whereas ozonation process for the pretreatent presented as the 22.1% removal of organics. The removal of colour was higher as 81.3% for the ozonation as the pretreatment than 77.7% for the Fenton process as the pretreatment.

Chemical Precipitation Treatment for the Disperse Dyes Removal (분산성 염료의 제거를 위한 응집처리)

  • 한명호;박종득;허만우
    • Textile Coloration and Finishing
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    • v.14 no.2
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    • pp.40-50
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    • 2002
  • In order to remove the pollutants effectively in the dye wastewater by chemical precipitation process, coagulation arid flocculation test were carried out using several coagulants on various reaction conditions. It was found that the Ferrous sulfate was the most effective coagulant for the removal of disperse dye(B79), and we could get the best result lot the removal of disperse dye(B56) in the aspects of TOC removal efficiency and sludge field. When the Ferrous sulfate dosage was $800mg/\ell$, the sludge settling velocity was very fast>, and the color was effectively removed in the disperse dye(B79) solution. Although the color removal was ineffective when the Alum was used as a coagulant, the sludge field was decreased in comparison with the Ferrous sulfate or the Ferric sulfate was used in the disperse dye(B56) solution. The general color removal effect for the disperse dye(B56 and B79) solutions, the Ferric sulfate was more proper coagulant than the Alum. It was showed that TOC removal was improved 5% and over by the addition of Calcium hydroxide, and $30mg/\ell$ of sludge yield was decreased(B79). When Alum or Ferric sulfate was used as a coagulant, pH condition for most effective color removal was 5 in B56 solution. In case of Ferrous sulfate as a coagulant, most effective pH condition for color removal was 9. When Ferric sulfate or Ferrous sulfate was used as a coagulant, pH condition for most effective color removal was 9 in B79 solution.

A Study on Color Treatment of Dyeing Wastewater with Bittern+Iron(II) chloride (간수+염화일철을 이용한 염색폐수 색도처리에 관한 연구)

  • 김만구;서명포
    • Textile Coloration and Finishing
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    • v.12 no.3
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    • pp.218-223
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    • 2000
  • Color removal of dyeing wastewater is becoming more important due to intensive limitation on color unit of effluent water, so this study was to investigate an efficient color removal of dyeing wastewater. We found that bittern+iron chloride(II) inorganic coagulant developed by Kabool research center is much higher than any other inorganic coagulants for color removal. Optimum pH of this coagulant was 10.5 and removed more than 90% for color removal efficiency. The results showed that COD and color unit of effluent water was average 60mg/L and 200~250 units when continuous activated sludge test after coagulation with this coagulant has done. From the results of the experiments, the application of bittern+iron chloride(II) inorganic coagulant can save the operating cost of wastewater treatment plants.

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Biological Treatment of Textile Wastewater by Anaerobic-Aerobic Reactor System (Pilot 혐기-호기 공정을 이용한 염색폐수의 생물학적 처리)

  • 박영식;안갑환
    • Journal of Environmental Health Sciences
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    • v.27 no.3
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    • pp.11-20
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    • 2001
  • An anaerobic sludge-aerobic fixed-bed biofilm(packed with ceramic support carrier of 1 inch size) reactor system was built up to treat textile wastewater. The efficiency of reactor system was examined by determining the effects of textile wastewater ratio(from 25% to 100% at HRT 24 h). The influent range of SCOD concentration and color were 1,036~1,357 mg/L, and 1,487~1,853 degree, respectively. When textile wastewater ratio was 100% and hydraulic retention time was 24 hours, SCOD removal efficiency by the anaerobic stage were 39.2% 100% and hydraulic retention time was 24 hours, SCOD removal efficiency by the anaerobic stage were 39.2% and the removal efficiency of the whole system were 75.8%. Color removal efficiency by the anaerobic stage were 45.4%(soluble color), and the removal efficiency of the whole system were 70.2%. In the A/A reactor system, the aerobic stage played an important role in removing both color and COD as well as anaerobic stage.

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Characteristics of Color and COD Removal of Dyeing Wastewater Using Electrolytically Produced NaOCl Solution (I) (전기분해에 의해 제조된 NaOCl을 이용한 염색폐수의 처리 특성(I))

  • Yoon, Yong-Soo;Ha, Beom-Yong;Thanh Huy, Ngo Van
    • Textile Science and Engineering
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    • v.42 no.5
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    • pp.316-322
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    • 2005
  • This study was carried out to investigate the feasibility of using electrolytically generated NaOCl solution for treatment of wastewater containing an acid dye(C.I. Acid Red 114). The NaOCl was produced by the electrolysis of aqueous NaCl solution. In order to asses the treatment characteristics, we evaluated the effect of pH and mixing ratio of the NaOCl solution to colored wastewater on the color and chemical oxygen demand$(COD_{Mn})$ removal. The optimum conditions for the dye and $COD_{Mn}$ removal were determined to be pH 5.0 and mixing ratio of 1 :9, at which more than $88\%$ color and $87\%$ $COD_{Mn}$ were removed within 10 min reaction time. Reaction rate constants for the 300 and 500mg/l of artificially prepared dyeing wastewater were estimated as 0.1764 and $0.1737 min^{-1}$ for color removal and 0.1197 and $0.1436 min^{-1}$ for $COD_{Mn}$ removal, respectively.

Characteristics of treatment by Electrolysis with a change of electrodes in sanitary landfill leachate (전기분해법에서의 전극변화에 따른 위생매립장 침출수의 처리특성)

  • Huh, Mock;Kim, Byung-Hyun;Kim, Gwang-Jin
    • Journal of the Korea Organic Resources Recycling Association
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    • v.10 no.1
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    • pp.68-74
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    • 2002
  • This study was performed to examine the availability of electrolysis for removal of remaining biologically refractoty humus and residual color of leachate which is biologically pretreated in domestic waste matter sanitary landfill by recycling to landfill. The obtained results were as follows; 1) The electrolysis of leachate through covered bed represented that the removal efficiency of CODcr and color range from 70~80%, in color removal the only electrolysis for a treatment of leachate meet the critia of effluent. 2) The highest removal efficiency was represented in pH 7~8. 3) At anode used Al, Fe, Stainless the removal efficiency of CODcr and color was high in order of Fe, Al, stainless, in considering the settled ability of reaction product in economic or after electro coagulation the removal efficiency was highest when anode was the Fe electrode. 4) In this study conditions for removed both CODcr and Color ar the same time represented thar anode was used Fe, electrode-distance was 2cm and reaction time was 40min in 8volts.

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A Study on the Removal of Refractory Organic Matter in Leachate sampled at Kimpo Landfill by means of Fenton Oxidation Process (Fenton 산화를 이용한 김포매립지 침출수내 난분해성)

  • 정동환;조일형;김익수;한인규;정문호
    • Journal of Environmental Health Sciences
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    • v.26 no.4
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    • pp.49-57
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    • 2000
  • This study was carried out to find the optimal condition to treat refractory organic matter which can’t treat clearly with biological treatment and to find the optimal division dosage and division dose timing in the modification of Fenton oxidation which is used resolve the problem that hydrogen peroxide is too expensive. The results are following; 1. The highest TOC removal efficiency was 41% and color removal efficiency was 64% when the dilution magnitude of leachate is fold. This suggests that dilution is efficiency when high concentration of leachate is treated. 2. The removal efficiency of TOC and color increased up to the molar ratio between ferrate and hydrogen peroxide was 1:1. However above that ratio, removal efficiency hardly increased. The highest removal efficiency of TOC and color were 38% and 71% when the mole ratio of ferrate to hydrogen peroxide was 1.5:1. 3. When the mole ratio between ferrate and hydrogen peroxide was fixed, the removal efficiency of TOC and color increased as the dosage of hydrogen peroxide increased. 4. pH of samples were adjusted at pH 3, 5, 7, 9, 11. After oxidation reaction, pH of samples were dropped to 2.59, 2.54, 5.34, 6.36 and 9.68. The highest color removal efficiency was 75.7% when initial pH was at pH 7. 5. The removal of TOC and color was ended within 10. min. and the removal efficiency increased logarithmically within 10min. However after 10 min., the removal efficiency of hardly increased. 6. The color removal efficiency was higher with modification of fentone oxidation than that with fentone oxidation by 5%. Optimal division dosage ratio was 1:1 and optimal dose timing ratio was 2:1. However the TOC removal efficiency was not higher with modification of Fenton oxidation than that with Fenton oxidation.7. The CO $D_{Mn}$ /BO $D_{5}$ Ratio decreased with the time went by. It meant bioresolution increased as time went by. However, after 15 min., the CO $D_{Mn}$ /BO $D_{5}$ Ratio did not decrease any more. 8. In the case of $H_2O$$_2$ Divisiom Dose experiment, the increase of bioresolution was highest at the $H_2O$$_2$ Division dosage Ratio of 3:7.3:7.

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