Abstract
The potential of Pleurotus eryngii was studied fordecolorization ability of different types of textile dyes whichwere screened on liquid medium. During decolorization study onseven textile dyes, it was found that P. eryngii had the mostefficient decolorization on reactive Blue 21 with decolorizationpercentage (98.4%). On the other hand, the immobilized P.eryngii on wheat straw, rice straw, sugar cane waste and wheatbran had biodegradation ability of Blue 21 dye. Theimmobilization of fungus on sugar cane waste gave moreefficient decolorization of Blue 21 with decolorizationpercentage (83.5%). Also it was found that the decolorizationpercentage in case of free P. eryngii was (50.8%). The fungushas the ability to produce lignin-degrading enzymes as laccase,Mn peroxidase, peroxidase and catechol oxidase enzymes.Immobilized P. eryngii on sugar cane waste exhibited the abilityto treat industrial textile effluent, 85 to 90% reductions of variousnutrients including biological oxygen demand (BOD) andchemical oxygen demand COD were achieved and color removalreached to 96%. So, it was suggested that the immobilized P.eryngii might be applicable to textile effluent system. It wasfound that the reuse of the treated textile effluent withimmobilized P. eryngii on sugar cane waste for irrigation of Basilplant and good result similar to that obtained by tap water.
Highlights
Major classes of synthetic dyes, including azo, anthraquinone and triarylmethane dyes, are toxic or even carcinogenic compounds with long turn over times (Hartman et al 1978)
Dye decolorization activity of Pleurotus eryngii was screened for seven dyes with the final dye concentration of 50 mg l-1
Fig (1) show the efficiency of P. eryngii to decolorize different kinds of dyes: reactive Blue 21, reactive Yellow 160, reactive Orange 122, direct Congo red, direct Yellow 5G, acid Methyl orange and acid Eriochrome black T and the ability to decolorize textile dyes were screened on liquid medium
Summary
Major classes of synthetic dyes, including azo, anthraquinone and triarylmethane dyes, are toxic or even carcinogenic compounds with long turn over times (Hartman et al 1978). Azo dyes are the most important group of synthetic colorants. Dye-containing effluents represent enormos problem because of their high chemical oxygen demand (COD) and biological oxygen demand (BOD), suspended solids and the content of toxic compounds which consider agreat problems in ecosystem with releasing in the environment, they often exhibit toxic effects on different organisms. Important pollutants in textile effluents are mainly recalcitrant organics, colors, toxicants and inhibitory compounds, surfactants, chlorinated compounds and salts (Sen and Demirer, 2003). Textile wastewater containing dyes must be treated before discharging into the environment (Tantak and Chaudhari, 2006)
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