Comparative Study of Rena and Mycoremediation Techniques in Reduction of Heavy Metals in Crude Oil Impacted Soil

Abstract

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.

Towards enhancing sustainable reuse of pre-treated drill cuttings for construction purposes by near-infrared analysis: A review

“…At the laboratory level, composting with farmyard manure and poultry droppings, bioaugmentation using two strains of bacteria (Pseudomonas aeruginosa and Bacillus subtilis), and mycoremediation using white-rot fungus (Pleurotus ostreatus) have been applied in the bioremediation of drill cuttings . However, it has been suggested that field-scale treatment of drill cuttings by RENA whether in biopiles or windrows has the potential to pollute local groundwater sources and faces limited land availability challenges because of large-space requirement Maduekwe et al, 2016). Similarly, bioaugmentation has been reported to have huge field-scale adaptability challenges (KMC Oiltools, 2005), which include: (1) overarching issue of the ability of the laboratory-prepared microbes to adapt to field conditions; (2) requirement of large volume of biopreparation of microbial consortium for use in the field; and (3) associated huge financial burden.…”