Abstract
The aim of this study was to investigate the potentials of composted animal waste in biodegradation of hydrocarbon in a cost-effective, efficient, and environmental-friendly manner. The contaminated soil sample was collected from Ojoo area in Ibadan, Oyo state, Nigeria. Two different types of compost – sheep-waste-sawdust (SPW-SD) and goat-waste-sawdust (GTW-SD) were applied to a soil at a rate (0 g, 750 g, 450 g). The result depicted that the contaminated soil experienced an enhanced natural bioremediation due to the applied bioremediation agents and the contaminated soil treated with SPW-SD gave best results. Samples remediated with SPW-SD and GTW-SD showed a Total Petroleum Hydrocarbon (TPH) removal efficiency of 55.4% and 7.9% respectively. Analysis showed that oil type, compost rate and period of application influenced the bioremediation process. From the results, composted organic waste application is a good and efficient way of remediating hydrocarbon impacted soil.
Highlights
Petroleum exploration and production has adversely affected the means of livelihood of most people in oil producing communities especially by degrading their farmlands
The pH value before remediation ranges from 6.1 to 6.8 and from 6.4 to 6.8 for samples treated with SPW-SD compost and GTW-SD compost respectively
The overall effect of the compost technology applied to the samples resulted in an average pH value increase of 7.58% for samples treated with GTW-SD compost while the one treated with SPW-SD compost had an average pH vlaue increase of 20.19%
Summary
Petroleum exploration and production has adversely affected the means of livelihood of most people in oil producing communities especially by degrading their farmlands. Human activites and/or natural occurrences has resulted to the release of petroleum hydrocarbon and its allied products into the environment This spillage of oil mostly occur during oil exploration, transportation, and at storage facilities [2]. The dependant on diesel for powering of vehicles and generators can lead to spillage in the environment during transportation, cleaning of tanks and leakages from storage tank [1, 3]. All these form of spillages lead to contamination of natural environment and degradation of the land around contaminated area. Contamination due to oil is known to alter the physical, chemical and biological properties of a soil [4, 5]
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