Journal
ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY
Volume 150, Issue -, Pages 232-239Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ecoenv.2017.12.043
Keywords
Acid Red 3R; Trichoderma tomentosum; Response surface methodology; Biodegradation; Phytotoxicity
Categories
Funding
- Natural Science Foundation of Tianjin [16JCYBJC23800]
- Training Program of Innovation and Entrepreneurship for Undergraduates [201710058089]
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A fast-growing fungus with remarkable ability to degrade several azo dyes under non-sterile conditions was isolated and identified. This fungus was identified as Trichoderma tomentosum. Textile effluent of ten-fold dilution could be decolorized by 94.9% within 72 h before optimization. Acid Red 3 R model wastewater with a concentration of 85.5 mg L-1 could be decolorized by 99.2% within the same time after optimization. High-level of manganese peroxidase and low-level of lignin peroxidase activities were detected during the process of decolorization from the culture supernatant, indicating the possible involvement of two enzymes in azo dye decolorization. No aromatic amine products were detected from the degradation products of Acid Red 3 R by gas chromatography-mass spectrometry (GC/MS) analysis, indicating the possible involvement of a special symmetrical oxidative degradation pathway. Phytotoxicity assay confirmed the lower toxicity toward the test plant seeds of the degradation products when compared to the original dye.
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