• 한국환경과학회지
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• 제15권7호
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• pp.659-667
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• 2006

This research aims at applicability of adsorption process in order to satisfy the restricted Effluent Quality Standards for dyeing wastewater. The dyeing wastewater treated by biological process with carrier imbedded microorganisms was directly applied to the activated carbon adsorption in Process A, The dyeing wastewater treated by Fenton oxidation for the effluent of biological process was applied to the adsorption in Process B. It was found that the optimum conditions of adsorption with granular activated carbon are $20^{\circ}C$ and 120 minutes for the batch experiment. Langmuir equation was fitted better than Freundlich equation to the experimental data. The breakthrough time of adsorption column was determined by color rather than $COD_{Mn}$ for both Process A and Process B. The results revealed that the breakthrough time of adsorption for two processes was extended by the treatment of Fenton oxidation for dyeing wastewater treated by biological treatment than the direct application of dyeing wastewater treated by the biological treatment. Adsorption process can be applied in order to meet the restricted Effluent Quality Standards for dyeing wastewater.

• 한국물환경학회지
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• 제23권3호
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• pp.303-308
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• 2007

Three types dyeing wastewater (dark, medium, light color) discharged from cotton textile dyeing with reactive dye was collected at each step of process. Each process dying wastewater was analyzed and treated by ionized gas. The analysis focused on $COD_{Cr}$, SS and color. Bleaching & scouring process wastewater has the highest $COD_{Cr}$ value in the three type dyeing wastewater. SS shows the highest value at dyeing process wastewater in dark and medium color but light color has at finishing process wastewater. The result of process wastewater treatment by ionized gas was that the ionized gas was effective in $COD_{Cr}$ removing of bleaching & scouring process and finishing process wastewater but was not good at dyeing process wastewater. From that result it is estimated that the ionized gas could not work in opening the aromatic ring and react only in aliphatic component of the molecule. Because the surfactants contained in bleaching & scouring process and finishing process wastewater have only one aromatic ring in its molecular structure, in contrast with the reactive dye compounds consist of aromatic rings great part of its molecular structure. The color almost removed in 1.5 hrs reaction time but $COD_{Cr}$ removal effiency was only 30.7% through 3hrs in 1500 mL of total dyeing wastewater treated by 10 L/min ionized gas.

• 한국염색가공학회지
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• 제10권4호
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• pp.45-52
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• 1998

Reuse of wastewater become an important consideration to solve the environmental pollution problems in recent industriallzation and urbanization. Especially, he characteristic of dyeing process is subject to use much water and thus has serious problems for removal of color and organic pollutants in their wastewater. This report is divided into two main parts ： The purpose of the first part was to determine if alkaline wastewater discharged from textile dyeing operation factory could be flocculated directly by Fenton oxidation method. This study was conducted to investigate Fenton reagent dose and reaction condition of Fenton method as pretreatment for dyeing wastewater in K dyeing industry were investigated. In the second part of this research, to treat dyeing wastewater it was found that the most effective way is to use ultrafiltation and reverse osmosis at the conditions of the pH 7.0~8.0 and operating pressure of $2.5~35kg_f/cm^2$. This paper is mainly dealt with the application on reuse system of dyeing wastewater treatment using ultrafiltration and reverse osmosis membranes. The results showed that dyeing wastewater could be reused by chemical, filter and membrane sequential treatment process.

• 상하수도학회지
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• 제18권6호
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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.

• 환경위생공학
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• 제18권4호
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• pp.45-51
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• 2003

This study was conducted to remove the color in dyeing wastewater by ozone oxidation process, and the results were summarized as follows ; The 18.3％ of BOD and 56.3％ TOC were removed as decreasing with pH 1 in dyeing wastewater, containing the polyester reducing process. It showed that terephthalic acid was precipitated at low pH. The color of dyeing wastewater was removed by the first order reaction, and the reaction rate constants at pH 3, 7, 12 were investigated $0.234{\;}min^{-1},{\;}0.215{\;}min^{-1}{\;}and{\;}0.201{\;}min^{-1}$ respectively. It showed that color was more effectively removed with direct reaction of ozone than radical reaction(non-direct reaction). As increasing of the water temperature, the reaction rate constants were increased slightly. It indicated that activity of ozone was improved at high water temperature.

• 한국생물공학회:학술대회논문집
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• 한국생물공학회 2001년도 추계학술발표대회
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• pp.505-508
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• 2001

An microorganism able to degrade ethylene glycol(EG) was developed. Using this microorganism, biological treatment of ethylene glycol was studied in Erlenmeyer flasks and a laboratory scale stirred loop bioreactor. The removal efficiencies of ethylene glycol from synthetic wastewater were 91.6% ${\sim}$ 97.7% at $30^{\circ}C$ ${\sim}$ $40^{\circ}C$, and 96.3% ${\sim}$ 97.9% at initial pH 9 ${\sim}$ 11 respectively. Also the removal efficiencies of ethylene glycol were found to be more then 92% at initial ethylene glycol concentration of 300mg/L ${\sim}$ I400mg/L. In treatment of weight loss treatment wastewater using Erlenmeyer flasks, the removal efficiencies of ethylene glycol were 79.6%. 82.5%. 77.6%. and 71.3% at initial pH 9. 10. 11. and 12.4 after 11 days of reaction. Moreover in treatment of complex dyeing process wastewater. the residual ethylene glycol was not detected at the initial pH 10.0 and pH 11.3 after 4 days of reaction. When stirred loop bioreactor was used for removing ethylene glycol, the residual ethylene glycol was not detected after 108 hrs and 60 hrs of reaction in batch treatment of weight loss treatment wastewater and complex dyeing process wastewater.

• 에너지공학
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• 제10권3호
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• pp.195-205
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• 2001

염색가공공정은 에너지 다소비형이며, 염색조업을 수행하는 과정에서 약 4$0^{\circ}C$ 정도의 열원폐수를 다량으로 방출하고 있지만 이를 회수할 수 있는 기술개발이 이루어지지 않아서 아직 미활용되고 있다. 본 연구에서는 이와 같은 열원폐수의 열을 회수하여 이용할 수 있는 방안을 마련하기 위하여 먼저 염색공정의 특성을 고찰하고. 직물별, 공정별 에너지원단위를 조사한 결과 상대적으로 에너지원같위가 높은 T/C, T/R 교직물 업체나 폴리에스테르 염색업체에서 폐수열을 회수하여 이용하기에 적합한 것을 알 수 있다. 그리고 염색업체별, 계절별 폐수의 배출량과 온도를 조사한 결과 각 업체당 평균 폐수배출량은 20,470톤/월이고, 평균폐수온도는 41.$0^{\circ}C$로 나타났다 또한, 배관 침적, 폐쇄 등으로 폐열회수시스템의 안정적 운전이나 열교환기의 성능에 악영향을 끼칠 수 있는 SS의 경우 폴리에스테르 염색폐수가 가장 낮아 폴리에스테르 염색폐수가 폐열회수에 가장 유리할 것으로 판단되었다. 염색공장에서 기존에 사용하고 있는 시스템과 폐수열이용 시스템의 에너지단가를 비교해보면 폐열회수시스템에서 압축식 열펌프를 적용하면 에너지단가는 22.50원이 되어 매우 경제적이며, 증기생산을 위한 보일러 연료로 LNG를 사용하는 업체에 압축식 폐열회수시스템을 적용할 경우가 투자비 회수기간이 2.09년으로 경제성이 매우 우수한 것으로 나타나 열펌프시스템의 적용기술을 보급할 수 있는 기반을 마련하였다.

• 청정기술
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• 제24권1호
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• pp.1-8
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• 2018

환경 오염에 대한 사회적 요구가 증가하고 염색 공정 폐수 배출에 대한 규제가 강화되면서 기존 수계 염색에서 발생하는 다량의 폐수와 에너지 낭비를 근본적으로 해결하기 위한 대안으로 초임계 염색 공정이 주목 받고 있다. 초임계 염색 공정에서는 기존 수계 염색에서 염색 용매인 물 대신 이산화탄소만을 사용하기 때문에 발생하는 폐수가 전혀 없고 미 고착 염료와 이산화탄소를 재사용 할 수 있다는 점에서 친환경적이다. 또한 염색 이후 추가적인 건조공정 없이 건조된 섬유를 얻을 수 있어 에너지 소비를 줄일 수 있다. 본 논문에서는 먼저 초임계 염색 공정의 발전배경과 현재 우리나라에서의 연구를 정리하였으며 초임계 염색의 원리와 기존 수계염색과의 장단점을 비교 설명하였다. 원리를 보다 자세히 설명하기 위해 초임계 이산화탄소와 염료 사이의 용해도를 비롯해 초임계 이산화탄소와 섬유에서 염료의 분배계수 및 물질전달 연구를 정리하였고, 현재 연구의 한계점과 연구방향을 제시하였다. 또한 초임계 염색 설비 내에서의 염료의 동적거동에 대하여 토의하였으며 전 세계적으로 개발된 초임계 염색 설비를 정리하였다. 마지막으로 현재 초임계 염색 공정의 최적화와 폴리에스터를 제외한 다른 합성섬유와 천연섬유에 적용하기 위해 필요한 연구개발 방향을 제시하였다.

• Environmental Engineering Research
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• 제22권3호
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• pp.312-319
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• 2017

The treatment of dyeing wastewater is not easy because dyes are mainly aromatic, heterocyclic compounds. The most effective technologies and methods to treat dyeing wastewater are costly and involve materials that are difficult to regenerate after use. Therefore, it is necessary to develop cost-effective, eco-friendly technologies to treat dyeing wastewater. The aim of this study was to investigate the removal of sulfur blue 11 (CI 53235) anionic dye using methyl esterified sericite (ME-sericite) adsorbents in an aqueous solution. The results are discussed in terms of the ME-sericite particle size, temperature, pH value and initial sorption rate according to the initial sulfur blue concentration. In addition, we analyzed the adsorption kinetics using a Pseudo-second-order model with the desorption and reusability. The methyl esterification caused a considerable increase in the specific surface area from 4.45 to $17.62m^2/g$. The ME-sericite adsorbents successfully removed > 98% of the sulfur dye in the aqueous solution. For the adsorption of 1 mg of sulfur dye, approximately 4.6 to 6.6 g/L ME-sericite were required. The desorption process was carried out by mixing a NaOH eluent to desorb 90.56% of the sulfur dye with 2 h of contact time. Thus, the ME-sericite is a promising adsorbent to treat dyeing wastewater due to its low dose requirement, high removal efficiency and inexpensive material.

• Korean Membrane Journal
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• 제7권1호
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• pp.58-66
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• 2005

Nanofiltration (NF) of a dyeing wastewater was carried out using polyamide NF-membranes. Before applying the wastewater to the membrane process, it was pretreated with various chemical coagulants such as alum, ferric chloride and HOC-100A. In order to see the effect of the pretreatment of the wastewater using chemical coagulants on the membrane separation process, the optimum conditions for the coagulation and sedimentation process using the chemical coagulants were sought. By the pretreatment, despite the different coagulants used, the chemical oxygen demand (COD) and UV-absorbance of the wastewater were lowered by more than $70\%$. The pretreated wastewater was then applied to the membrane process. The effect of the coagulants used for the pretreatment on the membrane fouling was studied. From this study, it was found that the HOC-100A was the best out of the coagulants used far the removal of the materials that could cause membrane fouling.