Effect of Dyebath Additives on Decolorization Efficiency in the Ozonation of Dyehouse Effluent |
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| Authors: | M. Mahbubul Hassan Christopher J. Hawkyard |
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| Affiliation: | 1. Now at Venture Business Laboratory, Yamagata University , 4-3-16 Jonan, Yonezawa-shi, 992–8510, Japan E-mail: mhassan@yz.yamagata-u.ac.jp;2. Department of Textiles , UMIST , P.O. Box 88, Sackville Street, Manchester, M60 1QD, United Kingdom |
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| Abstract: | It is necessary to study the effect of dyebath additives on decolorization efficiency in order to optimize ozone-based decolorization processes as the consumption of ozone can be reduced through selecting ozone favorable additives. The effect of 5 dyebath additives viz. electrolytes (sodium chloride and sodium sulfate), chelating agent (ethylene diamine tetra acetic acid or EDTA), reducing agent (sodium dithionite), optical brightener (Uvitex BHT), and dispersing agent (Zetex DNVL) was investigated. All of the additives showed synergistic effect as addition of sodium chloride, sodium dithionite and Zetex DN-VL markedly improved decolorization efficiency, but EDTA and optical brightener showed negative effect. Sodium sulfate did not show any positive or negative effect on decolorization efficiency. |
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| Keywords: | Ozone Dyehouse Effluent Textile Wastewater Decolorization Dyebath Additives Sodium Chloride Sodium Sulfate Chelating Agent Reducing Agent Optical Brightener Dispersing Agent |
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