assessment of petroleum sludge pollution risk on some characteristics of active carbon-treated soil

The objective of this study was to investigate the effect of various active carbon weights (100 and 150 g)and sizes (0.3, 1.5 and 4 mm) on the remediation of soil hydrocarbon pollution and monitor the negative impacts of petroleum hydrocarbons on parameters such as c/n, electrical conductivity (ec) and hydrophobicity of aggregates in petroleum polluted soil. this pilot study was conducted over 60 days as a split-plot in time experiment based on a completely randomized design with three replicates and included seven treatments (w100s0.3, w100s1.5, w100s4, w150s0.3, w150s1.5, w150s4, c), in which w and s indicated active carbon weight (g) and size (mm), respectively. the results showed that the application of active carbon at smaller sizes resulted in a significant decrease in the concentrations of c, n, c/n, ph, and total petroleum hydrocarbons )tph(.. active carbon treatment with 150 g weight and 0.3 mm size was the most effective treatment in tph biodegradation, reduction of organic carbon content and c/n ratio in the polluted soil. also, this treatment decreased aggregate hydrophobicity and dispersible clay percentage by tph degradation.