The comparative study of RENA, Mycoremediation and combination of the two techniques were carried out to determine their ability in the degradation of selected heavy metals (Cadmium, Chromium, Nickel, lead, Zinc, Manganese and Iron) in a Crude oil impacted soil. Three different plots for each technique and control were each spiked with 7.5 Litres of Bonny Light crude Soil Samples were taken at 0-15cm and 15-30cm depths for each of the techniques and control at 0, 4, 8, 12, 16 and 20 weekly intervals for heavy metal analyses. Results indicated that in the plots treated with RENA, Mycoremediation and combination of the two techniques, Lead (Pb) concentration was degraded by 55.9%,65.8%,85.1% respectively compared with control plots that gave 23.7% reduction of Pb. The percentage degradation of Manganese by RENA, Mycoremediation and Myco/RENA was 57.3, 64.3, 83.1 respectively while control plots recorded 26.1% Mn degradation. Concentration of Ni was reduced by 57.8% by RENA, 64.2%, by Mycoremediation and 85.6% by the combination of the two techniques (Myco/RENA) while in the control plots Ni was reduced by 27.89%. Concentration of Cd was reduced by 56.7% 65.6%, 88.7% by RENA, Mycoremediation and Myco/RENA respectively. The control plots recorded 26.1% Cd degradation. This was similar trend observed for other heavy metals studied. Thus the combination of the two techniques (Myco/RENA technique) gave a promising result in the degradation of all the heavy metals studied in Crude Oil Impacted soil.
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