Biodegradation of azo dyes by the yeast Candida zeylanoides in batch aerated cultures

• Published in: Chemosphere (Oxford) Vol. 38; no. 11; pp. 2455 - 2460
• Main Authors: Martins, M.A.M., Cardoso, M.H., Queiroz, M.J., Ramalho, M.T., Campus, A.M.O.
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01-05-1999; Elsevier
• Subjects: Applied sciences; azo compounds; Azo Compounds - chemistry; Azo Compounds - metabolism; biodegradation; Biodegradation, Environmental; Biological and medical sciences; Biological treatment of waters; Biotechnology; Candida - growth & development; Candida - metabolism; Candida zeylanoides; Coloring Agents - chemistry; Coloring Agents - metabolism; Culture Media; cultured cells; decolorization; dyes; Environment and pollution; Exact sciences and technology; Fundamental and applied biological sciences. Psychology; Hydrogen-Ion Concentration; Industrial applications and implications. Economical aspects; Industrial wastewaters; Kinetics; Pollution; Wastewaters; Water treatment and pollution; Candida zeylanoides; Chemical industry; Discoloration; Aerobiosis; Process control; Biological purification; Fungi; Bioreactor; Batchwise; Industrial waste water; Azo dye; pH; Fungi Imperfecti; Waste water purification; Performance; Thallophyta
• ISSN: 0045-6535; 1879-1298
• DOI: 10.1016/S0045-6535(98)00448-2

A number of simple azo dyes was degraded in liquid aerated batch cultures by a strain of the yeast
Candida zeylanoides. The standard decolorization medium contained glucose as a carbon and energy source, and its pH was either controlled to 5.0–5.2, or allowed to decrease to 3.2-2.8, in the course of microorganism growth. The extent of colour removal in the culture medium was assessed through the decrease in dye absorbance of the supernatants. The extent of colour removal ranged from 44 to 90%, after 7 days, for 5 out of 6 dyes studied in shaked cultures, without pH control, and from 46 to 67%, after 22 hours, for 6 out of 8 dyes in batch experiments, at controlled pH.