ABSTRACT
This research evaluated the biocatalytic remediation of heavy metal on crude oil polluted soil by fruit garbage enzymes (GE). The heavy metals evaluated were Cr, Pb, Ni, Hg, and Cd. The crude oil polluted were divided into 6 groups. Group 1 and 2 served as control and untreated soil respectively. Group 3 was treated with 30% of GE from organic wastes. Group 4 was treated with 50% of GE from plantain and banana wastes. Group 5 was treated with 70% of GE from plantain, watermelon, pineapple and banana wastes. Group 6 was treated with 100% of GE from plantain, watermelon, pineapple, and banana. Group 3, 4, 5, and 6 were treated with GE. The Hg concentration (95.03±0.02%) in group 6 after treatment with 100% of GE were significantly higher than those of group 2 (9.55±0.03%). The Cr concentration in group 6 (68.06±0.02%) after treatment with 100% of GE were higher than those of group 2 (12.04±0.04 %). The Cd concentration in group 6 (81.06±0.04%) after treatment with 100% of GE were higher than those of group 2 (17.33±0.02%). The Pb concentration in group 6 (50.63±0.03%) after treatment with 100% of GE were higher than those of group 2 (3.46±0.03%). The Ni concentration in group 6 (51.82±0.02%) after treatment with 100% of GE were higher than those of group 2 (36.02±0.02%). GE demonstrated biocatalytic remediation of heavy metals on crude oil polluted soil, hence might possibly be an alternative tool for the bioremediation.
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