Decolorization of CI Reactive Blue 222 by immobilized basidiomycetes in response to different carbon and nitrogen inputs

ABSTRACT Reactive dyes are found in the final effluents of the textile industry and cannot be removed by conventional treatment processes. The use of basidiomycetes appears to be an effective strategy to degrade dye molecules. In this paper, the parameters that favor decolorization of diazo dye were assessed using basidiomycetes immobilized in Luffa cylindrica. Different concentrations of saccharose and urea were assessed, in addition to the introduction of an enriched synthetic effluent. Results showed that the best decolorization occurred at the highest concentration of saccharose and the lowest of urea. It was observed a high biosorptive capacity of the solid support, which decreased when the effluent was enriched with saccharose and urea due to consequent increase in microbial activity. Using the enriched effluent, Pleurotus ostreatus decolorized about 70% within 48 hours, and Trametes villosa decolorized 58% after 240 hours. Peniophora cinerea did not respond to the conditions tested.

摘要：活性染料广泛存在于纺织工业最终出水中，且无法通过常规处理工艺去除。利用担子菌（basidiomycetes）降解染料分子是一种颇具潜力的有效策略。本文以固定于丝瓜络（Luffa cylindrica）上的担子菌为实验材料，评估了可提升双偶氮染料脱色效果的各项参数。实验考察了不同浓度的蔗糖（saccharose）与尿素（urea），并引入富集型合成废水开展测试。结果显示，当蔗糖浓度处于最高水平、尿素浓度最低时，脱色效果最优。研究观察到该固体载体具备较高的生物吸附容量，但当废水中因蔗糖与尿素浓度升高导致微生物活性增强时，其吸附容量会出现下降。采用富集型合成废水时，糙皮侧耳（Pleurotus ostreatus）可在48小时内实现约70%的脱色率，绒毛栓菌（Trametes villosa）在240小时后可实现58%的脱色率，而灰纹革菌（Peniophora cinerea）对本次测试的条件无响应。