FUW TRENDS IN SCIENCE & TECHNOLOGY JOURNAL
(A Peer Review Journal)
e–ISSN: 2408–5162; p–ISSN: 2048–5170
keywords: Alternaria alternate, bioremediation, hexavalent chromium, wastewater
Heavy metalpollution of the environment has become a global catastrophe that requires imminent attention. Several cleaning techniques including bioremediation with the use of bacteria and fungi have proven to be effective.In this study,the potential of Alternaria alternata isolated from sorghum grain in bioremediation of waste water contaminated with hexavalent chromium ion was assayed by determining its chromium uptake, mycelia growth, glucose uptake and effect of pH in medium with different concentrations of potassium heptadichromate (VII) ion (K2Cr2O7). The maximum average mycelia growth of 2.48 cm was achieved at 0.05 g/100mL concentration of K2Cr2O7, however, growth was inhibited at higher concentrations of 0.25 g/100mL as indicated by a decrease in average mycelia growth to 1.48cm. A decrease in glucose concentration was also observed as K2Cr2O7 concentration decreasedwith maximum decreaseobserved at 0.05 g/100mL after 9 days. The pH of the media containing varying concentrations of K2Cr2O7 (0.05-0.25 g/100mL) changed from basic to acidic as the organism grow. At low concentration of 0.05 g/100mL of K2Cr2O7, media pH changed from 9.09-5.03 and 8.60-6.65 at high concentration of 0.25g. Alternaria alternata species have shown to be important fungi with promising potentials of bioremediating wastewatercontaminated with hexavalent chromium ion.
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