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Experimental-based Study of Justicia carnea and Moringa oleifera Extract on Crude oil Remediation of Contaminated Loamy Soil

Ukpaka C. P., Obuge. A. M., Amadi S. A., Puyate Y. T.

Abstract


This study was carried out to investigate the comparison of the performance of Justicia carnea and Moringa oleifera plants extract treated with direct sunlight and the absence of sunlight on the bioremediation process of crude oil contaminated loamy soil. Total petroleum hydrocarbon degraded,total microbial count, pH, amount of nitrogen, phosphate, and potassium, soil total organic carbon, total soil organic matter were examined. Twenty one (21) batch reactors were used for this research with each reactor containing 1kg of loamy soil samples contaminated with 100ml of crude oil and treated with plants extracts of 20g, 40g, 60g, 80g, 100g of Justicia carnea and Moringa oleifera plant extract sundried( JPEL,MPEL), and room dried(JPED, MPED), to each of the soil samples. The physiochemical properties of the soil sample used before and after were determined at the beginning and end of 84 days of the experiment. These physiochemical properties were electrical conductivity (EC), moisture content (MC), soil total organic carbon (STOC), soil total organic matter (STOM), total nitrogen (TN) and phosphorus (P) in the soils increased. However, EC, MC, STOC, STOM, TN and P declined significantly with time after exposure to the treatment, while pH trend towards neutrality after the treatment. The rate of biodegradation of TPH was investigated for every 14 days interval for 84 days, the results obtained shows a high performance of all the plants extracts on all the soils samples in this order JPED> JPEL, MPED > MPEL though with relatively high close degradation potentials. The data obtained from the experiment show a high viability of the plants extracts in the biodegradation process.


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