ABSTRACT:

Bioremediation is an aboveground remediation technology that is commonly used worldwide for the biodegradation of petroleum contaminated soils, drill cuttings and oil sludge. Bioremediation is based on the fact that all hydrocarbons are biodegradable by nature. The project started in March, 2007 for about 12,000 tones of contaminated soil (the initial TPH concentration was ranged 48 – 55%). The contaminated soil was piled in three biopiles. Bioremediation incorporates the addition of nutrient additives that potentially enhance the rate of biodegradation of the petroleum hydrocarbons. The indigenous (existing naturally) biological activity in the soils is enhanced through aeration (tilling and/or chemical additives to provide electron acceptors, bioavailability and adjustment of pH), addition of moisture (watering), and/or the addition of surfactants, nutrients, and oxidation potential adjusters. Meanwhile, the visual improvements of biopiles constituents become evident during the bioremediation progress. This was resembled in the less viscous fluids coming out of the pile and almost vanished viscous chunks of heavy chain hydrocarbons. It is important to note that degradation is usually characterized by half life time. The half life time varied for the three biopiles from 30 to 46.2 days. Moreover the analytical results revealed TPH concentration less than 5%

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