Author/Authors :
-، - نويسنده Biotechnology Group, Faculty of Engineering, University of Isfahan, P.O. Box 81744, Isfahan, IR Iran Salehizadeh, Hossein , -، - نويسنده Chemical Engineering Group, Faculty of Engineering, University of Isfahan, P.O. Box 81744, Isfahan, IR Iran Mousavi, Marzieh , -، - نويسنده Chemical Engineering Group, Faculty of Engineering, University of Isfahan, P.O. Box 81744, Isfahan, IR Iran Hatamipour, Sadegh , -، - نويسنده Department of Biology, Faculty of Science, University of Isfahan, P.O. Box 81746, Isfahan, IR Iran Kermanshahi, Kasra
Abstract :
An isolate from polluted soil identified as Aspergillus sp. MS-100 was able to consume vanadium oxide octaethyl porphyrin as a model for protoporphyrins in crude oil. The isolate degrades about 55% of vanadium oxide octaethyl porphyrin (VOOEP) under optimum conditions during 7 days. The release of more than 0.96 mgl-1 of free vanadium into the aqueous phase was confirmed using atomic absorption. By using the Taguchi experimental design method, the optimum values of pH, temperature and initial concentration of VOOEP were determined as 5.5, 30ºC, and 20 mg/l, respectively. The reduction of VOOEP in the culture medium was accelerated by Ag+ and inhibited by Zn2+ and EDTA. The Sn2+ and Pb2+ ions showed a stimulatory effect at 0.1 mM and an inhibitory effect at 1 mM.
