Many of the hydrocarbons are resistant to degradation in the natural environment. The overall degradation rate of hydrocarbons biodegradation in soils is strictly limited by a variety of parameters Rockne et.al 2002. Two of the most important soil factors that affect hydrocarbons degradation are soil pH and available nutrients. The results of the present study reveal considerable effects of soil pH and addition of nutrients (in the form of N-P-K fertilizer) on the hydrocarbons degradation of crude oil contaminated soil.
The results obtained from the detailed remediation studies carried out with soil spiked with different amounts of crude oil under different pH values are presented in Table 3, Table 4 and Table 5. The results estimate the loss of TPH from the crude oil contaminated soil samples for each treatment options employed to study the effect of pH on remediation.