Journal ArticleDOI
Biodegradability enhancement of textile dyes and textile wastewater by VUV photolysis
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In this article, photo-degradation and biodegradability have been studied for three different families of non-biodegradable textile dyes (Intracron reactive dyes, Direct dyes and Nylanthrene acid dyes) using VUV photolysis.Abstract:
Photo-degradation and biodegradability have been studied for three different families of non-biodegradable textile dyes (Intracron reactive dyes, Direct dyes and Nylanthrene acid dyes) and a textile wastewater, using VUV photolysis. Ninety percent of color removal of dye solutions and wastewater is achieved within 7 min of irradiation. Biological oxygen demand (BOD) was found to increase during discoloration process while chemical oxygen demand (COD) decreased. The biodegradability index (BOD5/COD) increases up to 0.40 for most of the dye solutions when total discoloration is obtained. It implies that VUV photolysis tends to enhance the biodegradability of dye containing solutions. Thus, this technique could be used as a pre-treatment step for conventional biological wastewater treatment.read more
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References
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Journal ArticleDOI
Treatment and Reuse of Wastewater from the Textile Wet-Processing Industry : Review of Emerging Technologies
TL;DR: The main limitation of this approach is the treatment of the concentrate stream as discussed by the authors, which is a segment of the research dealing with the separate handling of speci-c sub-streams such as dyebath effluents to which membrane -ltration is sometimes applied.
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Predicting azo dye toxicity
Mark A. Brown,Stephen C. De Vito +1 more
TL;DR: Three different mechanisms for azo dye carcinogenicity were identified, all involving metabolic activation to reactive electrophilic intermediates that covalently bind DNA.
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Use of Fenton reagent to improve organic chemical biodegradability.
TL;DR: Fenton reagent has been used to test the degradation of different organic compounds in aqueous solution and eliminates the toxic substances and increases the biodegradability of the treated water (measured as the ratio BOD5/COD).
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Integration of chemical and biological oxidation processes for water treatment: Review and recommendations
Jon P. Scott,David F. Ollis +1 more
TL;DR: The literature of studies which used a combination of chemical and biological degradation (usually oxidative) of organic contaminants in water is reviewed in this paper, where four wastewater contaminant types are identified which can benefit from combined processes: recalcitrant compounds, biodegradable wastes, inhibitory compounds and intermediate dead-end products.
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Fate of azo dyes in sludges
TL;DR: In this article, the role of vinyl sulfone and hydroxyl functional groups in the removal of Reactive Black 5 dye was investigated under both aerobic and anaerobic conditions, and the potential of the dyes to leach from sludge in landfills was also investigated using the toxicity characteristic leaching procedure.