African Journal of
Biotechnology

  • Abbreviation: Afr. J. Biotechnol.
  • Language: English
  • ISSN: 1684-5315
  • DOI: 10.5897/AJB
  • Start Year: 2002
  • Published Articles: 12227

Full Length Research Paper

Decolorization efficiency of Funalia trogii under static condition: Effect of C: N ratios

M. Ali Mazmanci* and Ali Unyayar
Department of Environmental Engineering, Faculty of Engineering, Mersin University, Ciftlikkoy Campus, 33343 Mersin, Turkey
Email: [email protected], [email protected]

  •  Accepted: 18 August 2010
  •  Published: 27 September 2010

Abstract

Effects of physical conditions (pH and temperature), carbon and nitrogen source on decolorization of Reactive black 5 (RB5) by Funalia trogii were investigated under the static condition. Optimization of temperature and pH were also examined. Moreover, two different carbon sources (sucrose and starch), four different nitrogen sources and also four different C:N ratios (0.9, 3.0, 6.0, 18.0) were studied. Decolorization was expressed by mg dye / g dry mycelium weight. Optimal pH and temperature were found to be 4.78 and 30ºC, respectively. Decolorization efficiency increased with decreasing C:N ratio in starch-NH4H2PO4, starch-urea, sucrose-NH4H2PO4 and sucrose-urea containing media. Maximum decolorization was found as 9.61 and 7.77 mg dye/g dry mycelium weight in media containing no extra carbon and nitrogen sources. Kinetic studies were also carried out. The Lineweaver-Burk plot gave a Km of 406.66 mg/L and Vmax of 196.07 mg/L day for the diazo dye Reactive Black 5 decolorization by F. trogii under static condition.

 

Key words: Funalia trogii, decolorization, reactive black 5, static condition.