ENHANCED BIOREMEDIATION AND VEGETATION REGENERATION PERFORMANCE OF CRUDE OIL POLLUTED SOIL .........

The capacity of oil palm bunch ash and sawdust amendments to increase bioremediation of crude oil polluted soil was tested to identify the capabilities of the test materials to enhance degradation of the hydrocarbon content of crude oil polluted soil. In each of the five buckets labelled CT, NA, BS1, BS2, and BS3, one thousand five hundred gramme (1500 g) of soil was deposited. CT (the control) received no treatment, but the other buckets were each treated with crude oil at a pollution level of 6.7 percent (v/w). After pollution, NA did not introduce any amendment material. BS1 and BS2 were amended with 200 g each of oil palm bunch ash and sawdust, whereas BS3 was adjusted with a mixture of 200 g oil palm bunch ash and 200 g sawdust. In BS1, BS2, and BS3, soil pH increased from 8.70.04 to 10.50.06, 5.30.01 to 8.50.04, and 5.60.18 to 11.50.15, respectively. In BS1 and BS2, the percentage total petroleum hydrocarbon content reduced by 65 percent, whereas in BS3 it decreased by 52 percent. Total nitrogen increased from 0.660.1 to 0.690.0 percent in BS1, remained unchanged in BS2, and decreased from 0.40.0 to 0.20.0 percent in BS3, while average phosphorus increased from 0.40.0 to 23.04.2 mgkg-1, 0.30.0 to 1.80.4 mgkg-1, and from 0.21.0 mgkg-1 to 52.64.6 mgkg-1, respectively, in BS1, BS2, and BS3. Plant regeneration occurred in CT, NA, and BS2, but not in BS1 or BS3. Oil palm bunch ash restricted vegetation renewal, however the amendment materials improved bioremediation of crude oil polluted soil.

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