Journal Article10.1080/10643380091184237
Decolorization of Wastewater
1K
TL;DR: In this article, the background information of dye molecules and dye waste characteristics are described and the methods for color measurements and standards are discussed, and different techniques including almost all the known physical, chemical and biological techniques are described for decolorization.
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Abstract: The public demand for color-free waste discharge to receiving waters and tougher color standards have made decolorization of a variety of industrial wastes a top priority. Unfortunately, with the complicated color-causing compounds, the decolorization of these wastes is a difficult and challenging task. This article first describes the background information of dye molecules and dye waste characteristics. The methods for color measurements and standards are then discussed. Different techniques including almost all the known physical, chemical and biological techniques are described for decolorization. Each process alone may not be able to meet the requirements. A combination of these processes, for example, chemical-biological, biological-chemical, chemical-physical, chemical-chemical, etc. is often used. The formation of intermediates during the decolorization process is emphasized. These byproducts may be more toxic than the parent compounds. Thus, the extent of the mineralization in waste decolorizatio...
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TL;DR: In this article, simulated dye wastewater, separately prepared with disperse, reactive, direct, acid and basic dyes, were decolorized with a hydrogen peroxide-ferrous ion system, known as Fenton's reagent.
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TL;DR: In this paper, the results confirmed that dyestuffs are most unlikely to show any significant biodegradation in such tests and that substantial colour removal was observed which may be attributed to the elimination of the dyes by adsorption.
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The removal of colour from effluent using various adsorbents—III. Silica: Rate processes
TL;DR: In this article, the rate of adsorption of Astrazone Blue, a basic dye, on Sorbsil Silica has been studied, where particle size, initial dye concentration, agitation and dye solution temperature were all considered.
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Environmental Photochemistry on Semiconductor Surfaces: Photosensitized Degradation of a Textile Azo Dye, Acid Orange 7, on TiO2 Particles Using Visible Light
TL;DR: In this article, the degradation of a textile azo dye, acid orange 7, has been carried out on TiO2 particles using visible light using diffuse reflectance absorption and FTIR techniques.
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