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881.
Ashutosh Kumar Verma Chandralata Raghukumar Pankaj Verma Yogesh S. Shouche Chandrakant Govind Naik 《Biodegradation》2010,21(2):217-233
Textile dye effluents pose environmental hazards because of color and toxicity. Bioremediation of these has been widely attempted.
However, their widely differing characteristics and high salt contents have required application of different microorganisms
and high dilutions. We report here decolorization and detoxification of two raw textile effluents, with extreme variations
in their pH and dye composition, used at 20–90% concentrations by each of the four marine-derived fungi. Textile effluent
A (TEA) contained an azo dye and had a pH of 8.9 and textile effluent B (TEB) with a pH of 2.5 contained a mixture of eight
reactive dyes. The fungi isolated from mangroves and identified by 18S and ITS sequencing corresponded to two ascomycetes
and two basidiomycetes. Each of these fungi decolorized TEA by 30–60% and TEB by 33–80% used at 20–90% concentrations and
salinity of 15 ppt within 6 days. This was accompanied by two to threefold reduction in toxicity as measured by LC50 values against Artemia larvae and 70–80% reduction in chemical oxygen demand and total phenolics. Mass spectrometric scan
of effluents after fungal treatment revealed degradation of most of the components. The ascomycetes appeared to remove color
primarily by adsorption, whereas laccase played a major role in decolorization by basidiomycetes. A process consisting of
a combination of sorption by fungal biomass of an ascomycete and biodegradation by laccase from a basidiomycete was used in
two separate steps or simultaneously for bioremediation of these two effluents. 相似文献
882.
Peristylus sahanii (Orchidaceae), a new species from Jharkhand state (Chotanagpur plateau), India is described and illustrated. 相似文献
883.