Amaranth decoloration by Trametes versicolor in a rotating biological contacting reactor
- 11 April 2006
- journal article
- Published by Oxford University Press (OUP) in Journal of Industrial Microbiology & Biotechnology
- Vol. 33 (9), 791-795
- https://doi.org/10.1007/s10295-006-0117-0
Abstract
Sequential batch and continuous operation of a rotating biological contacting (RBC) reactor and the effects of dissolved oxygen on the decoloration of amaranth by Trametes versicolor were evaluated. Amaranth belongs to the group of azo dyes which are potential carcinogens and/or mutagens that can be transformed into toxic aryl amines under anaerobic conditions. Cultivation of T. versicolor in a stirred tank reactor was found to be unsuitable for amaranth decoloration due to significant biomass fouling and increase in medium viscosity. Assuming that decoloration follows first-order kinetics, amaranth was decolorized more rapidly when T. versicolor was immobilized on jute twine in a RBC reactor operated either in a sequential batch (k=0.25 h–1) or in a continuous (0.051 h−1) mode compared to a stirred tank reactor (0.015 h−1). Oxygen was found to be essential for decoloration with the highest decoloration rates occurring at oxygen saturation. Although longer retention times resulted in more decoloration when the RBC was operated in the continuous mode (about 33% amaranth decoloration), sequential batch operation gave better results (>95%) under similar nutrient conditions. Our data indicate that the fastest decoloration should occur in the RBC using nitrogen-free Kirk’s medium with 1 g/l glucose in sequential batch operation at rotational speeds and/or aeration rates which maintain oxygen saturation in the liquid phase.Keywords
This publication has 17 references indexed in Scilit:
- Evaluation of support materials for the surface immobilization and decoloration of amaranth by Trametes versicolorApplied Microbiology and Biotechnology, 2002
- Increased production of laccase by the wood-degrading basidiomycete Trametes pubescensEnzyme and Microbial Technology, 2002
- Biological decolorization of textile dyestuff containing wastewater by Coriolus versicolor in a rotating biological contactorEnzyme and Microbial Technology, 2002
- Decolorization of bleach plant effluent by mucoralean and white-rot fungi in a rotating biological contactor reactorJournal of Bioscience and Bioengineering, 2001
- Decolorization of Bleach Plant Effluent by Mucoralean and White-Rot Fungi in a Rotating Biological Contactor Reactor.Journal of Bioscience and Bioengineering, 2001
- Biodegradation of trichloroethylene in a rotating biological contactorWater Research, 2000
- Effects of glucose and NH4+ concentrations on sequential dye decoloration by Trametes versicolorEnzyme and Microbial Technology, 1999
- Characterization of Ankara meat packing plant wastewater and treatment with a rotating biological contactorInternational Journal of Environmental Studies, 1993
- A continuous biological process to decolorize bleach plant effluentsBiotechnology Advances, 1984
- Purification and properties of pyranose oxidase from Coriolus versicolor.Agricultural and Biological Chemistry, 1984