• Advances in environmental research
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• 제3권4호
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• pp.293-306
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• 2014

The present study primarily focuses on the evaluation of the comparative effect of chemical coagulation and ultrasonication for elimination of aromatic amines (AAs) present in anaerobically pretreated textile wastewater containing different types of dyes including azo dyes. Color and COD reduction was also monitored at the optimized conditions. The production of AAs was measured spectrophotometrically in the form of total aromatic amines (TAAs) and also verified with high performance liquid chromatography (HPLC) selectively. A composite coagulant, magnesium chloride (MC) aided with aluminium chlorohydrate (ACH) in an equal ratio (MC + ACH) was utilized during the coagulation process, which yielded 31% of TAAs removal along with 85% of color and 52% of COD reduction. At optimized power (200 W) and sonication time (5 h), an appreciable TAAs degradation efficiency (85%) was observed along with 51% color reduction and 62% COD removal using ultrasonication. The chromatographic data indicate that sulphanilic acid and benzidine types of aromatic amines were produced after the reductive cleavage of utilized textile dyes, which were effectively mineralized after ultrasonication. The degradation followed the first order kinetics with a correlation coefficient ($R^2$) of 0.89 and a first-order kinetic constant (k) of $0.0073min^{-1}$.

• 자원리싸이클링
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• 제21권2호
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• pp.9-16
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• 2012

본 총설은 수 처리용으로 이용되는 여러 가지 종류의 농업부산물과 염료를 종합평가한 것이다. 염료로 인한 수질오염은 심각한 환경문제를 유발하고 있으나 적절한 기술과 장치는 물론, 수 처리제가 고가로 공급되어 수질관리에 어려움을 겪고 있다. 그에 따른 대체제로 최근에 농업부산물을 이용한 저가흡착제 개발에 높은 관심을 보이고 있는 가운데, 각종 농업부산물의 흡착기능을 조사하였다. 또한 활성탄을 대체할 만한 저가이면서 환경친화적인 염료폐수처리제 개발과 그 효용성을 연구하여 활성탄과 같은 흡착제의 대체가능성을 평가하였다.

• 한국염색가공학회지
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• 제14권2호
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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.

• KSBB Journal
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• 제15권1호
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• pp.66-71
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• 2000

Geotrichum candidum (KCTC 6195)를 이용하여 색도제거를 위한 최적조건은 초기 pH 6, $30^{\circ}C$, glucose 농도 30 g/L이었으며 빛은 세포성장과 색도제거에 영향을 주지 않았다. 한편, 세포성장과 색도제거를 위해서는 세포의 성장원(glucose)이 필수적이었다. 염료의 종류에 따라 색도제거량과 속도는 차이가 있지만 분산염료, 산성염료, 반응염료에 대해 색도제거가 고체배치와 액체배치에서 가능했으며 Acid goange 10 염료의 경우 배양 후 120 시간 후에는 초기 100 ppm에서 91%로, 초기 500ppm에서 84%까지 색도제거되는 것을 알 수 있었다. 색도제거에서 Acid red 1: 19.8%, Acid red 88, 73%, Acid orange 10; 12.1%, Reactive blue 19; 14.6%가 흡착으로 제거되었다. 이로서 효소에 의한 색도제거뿐만 아니라 흡착에 의해 색도제거됨을 알 수 있었다. 2일간 배양하고 glucose를 첨가하여 1일간 추가 배양한 경우 97%까지 색도제거 되었다.

• Carbon letters
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• 제8권1호
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• pp.1-5
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• 2007

The use of low cost and ecofriendly adsorbent has been investigated as an alternative to the current expensive method of removing dyes from wastewater. Cow dung cakes were collected from the nearby village which was burnt in a muffle furnace at $500^{\circ}C$ to obtain the required ash. This paper deals with the removal of Reactive Blue 221, Acidoll Yellow 2GNL and Olive BGL which are mainly used in textile industry, from aqueous solution by cow dung ash without any pretreatment. The adsorption was achieved under different pH, adsorbate concentration and the applicability of Langmuir and Freundlich isotherms were examined.

• 한국염색가공학회지
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• 제17권2호
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• pp.31-39
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• 2005

This study was conducted to remove the dyes in dye wastewater by the chemical precipitation or biological treatment which are one of the main pollutants in dye wastewater. In order to remove the disperse dyes effectively in aqueous solution by chemical precipitation process, coagulation and flocculation tests 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(DB79), and we could get the best result for the removal of disperse dye(DB56) in the aspects of TOC removal efficiency and sludge yield. When the Ferrous sulfate dosage was 800mg/l, the sludge settling velocity was very fast$(SV_{30}=4\%)$, and the color was effectively removed in the disperse dye(DB79) solution. Although the color removal was ineffective when the Alum was used as a coagulant, the sludge yield decreased in comparison with the Ferrous sulfate or the Ferric sulfate being used in the disperse dye(DB56) solution. In order to decolorize disperse dye(DR17) by using biological treatment process, a strain which has potential ability to degrade disperse dyes was isolated from natural system. The optimal culture conditions of temperature and pH were found to be $40^{\circ}C\;and\;8.5\~9$, respectively. When yeast extract was mixed with polypeptone at the mixing ratio of 1:1 as a nitrogen source, decolorization efficiency was highest$(93\%)$ among the nitrogen sources. The strain screened was excellent to adjust to pH, and it seems to have ability to control pH needed to growth. The optimal culture conditions in concentration of $MgSO_{4.}\cdot7H_2O\;and\;KH_2PO_4$ were $0.1\%(w/v)\;and\;0.2\%(w/v)$, respectively. Strains degrading and decolorizing reactive dyes, RB198 and RR141 which were isolated from water system, are named RBK1 and RRK. And the cell growth characteristics of RBK1 and RRK were investigated. The optimal culture conditions of temperature and pH were found to be 30t' and 7.0, respectively. Optimum nitrogen source was peptone, and it was found that decolorization efficiencies by strains RBK1 and RRK, were $85\%\;and\;62\%$, respectively, with introduction of 4,000mg/l of peptone. In the case of RBK1, color removal efficiencies were very high below 400mg/l. Decolorization efficiency was over $90\%$ at 20hours of culture time. The Color degradation ability of RRK was lower than that of RBK1.

• Carbon letters
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• 제11권3호
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• pp.169-175
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• 2010

The study describes the results of batch experiments on the removal of Reactive Yellow 15 (RY15) and Reactive Black 5 (RB5) from synthetic textile wastewater onto Activated Carbon from Walnut shell (ACW). The experimental data were analyzed by the Langmuir, Freundlish, Temkin and Dubinin-Radushkevich (D-R) models of adsorption. The experiments were carried out as function of initial concentrations, pH, temperature (303-333), adsorbent dose and kinetics. The surface area and pore volumes of adsorbent were measured by BET and BJH methods. The findings confirm the surface area (BET) is 248.99 $m^2/g$. The data fitted well with the Temkin and D-R isotherms for RY15 and RB5, respectively. The most favorable adsorption occurred in acidic pH. Pseudo-second order kinetic model were best in agreement with adsorption of RY15 and RB5 on ACW. The results indicate that walnut shell could be an alternative to more costly adsorbent currently being used for dyes removal.

• 한국염색가공학회지
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• 제12권1호
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• pp.25-31
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• 2000

In order to decolorize disperse dyes by using biological treatment process, a strain which has potential ability to degrade disperse dyes was isolated from natural system. To increase the removal efficiency of decolorization in the aqueous solutions, the optimal condition of decolorization by this strain was investigated, and continuous plant test was also developed. The optimal culture conditions of temperature and pH were found to be 4$0^{\circ}C$ and 8.5~9, respectively. When yeast extract was mixed with polypeptone at the mixing ratio of 1:1 as a nitrogen source, decolorization efficiency was highest(93%) among the nitrogen sources. The strain to be screened was excellent to adjust to pH, and it seems to be have ability to control pH needed to growth. The optimal culture conditions in concentration of $MgSO_4\cdot{7H}_2O$ and $KH_2PO_4$ were 0.1%(w/v) and 0.2%(w/v). The result of continuous plant process using wastewater was as following : $COD_{Mn}$ removal efficiency was over than 50%, and this strain was very excellent in decolorization-efficiency for the wastewater of Taegu dyeing complex.

• Journal of Industrial and Engineering Chemistry
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• 제67권
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• pp.187-198
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• 2018

Clay based coating with zwitterionic functionality is used to remove cationic and anionic dyes. Adsorbent coating was prepared by the mixing of bentonite clay, acrylic polymer (AP) and polyethylene-diamine (EPI-DMA). Characterization was performed using SEM-EDX, XRF, X-ray mapping and FTIR analyses. The adsorption capacity of ZACC was found to be increased from 59.35 to 255.99 mg/g and from 45.84 to 70.09 mg/g for BG and AR1 dyes, respectively using initial concentration (50-200 ppm). Significant adsorption capacity along with mechanical and chemical stability formulates ZACC as an excellent composite coating for treatment of anionic and cationic dyes from industrial wastewater.

• KSBB Journal
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• 제14권1호
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• pp.31-35
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• 1999

Penicillium janthinellum의 생균체와 변형 균체를 사용한 azo와 reactive계 염료의 생흡착에 대한 연구가 수행되었다. 반응액의 pH가 초기 흡착율과 탈색에 영향을 주어, 최적 pH는 3.0이었으며, 최적 온도는 $40^{\circ}C$이었다. Reactive계 염료인 Apollocion Red 7EB와 Apollfix Red SF-3B와 Apollocion Red HE-3B는 각각 초기 흡착율이 0.06, 0.086, 0.07mg/g.mm이었다. Azo와 reactive 계 염료들을 함유한 혼합염료도Pen janthinellum 균체에 흡착되어 0.084mg/g.min의 초기 흡착율을 보였다. Detergent 첨가시 탈색 백분율과 초기 흡착율은 대조군의 경우보다 낮았다. 또한 이온의 첨가는 염료의 흡착율에 영향을 미치지 않았다 Pen janthinellum의 변형 균체도 염료의 흡착율을 보였고, Apollocion Red 7EB의 흡착에 있어 이온교환수지보다 월등한 흡착능을 보였다.