Biodegradation of Used Motor Oil in Soil Using Organic Waste Amendments

Table 2

Biodegradation rates of hydrocarbon in used lubricating-oil-contaminated soil.

Treatment	Biodegradation constant (𝑘) day^−1
Soil + 5% oil + BS	0.4010^b
Soil + 5% oil + BSG	0.4361^b
Soil + 5% oil + SMC	0.3100^b
Soil + 5% oil	0.1886^a
Autoclaved soil + 5% oil	0.0079^a
Soil + 15% oil + BS	0.0556^b
Soil + 15% oil + BSG	0.0479^a
Soil + 15% oil + SMC	0.0216^b
Soil + 15% oil	0.0092^a
Autoclaved soil + 15% oil	0.0033^a

Values followed by letter b indicate significant difference at 𝑃<0.05 level, while values followed by “a” are not different significantly at 𝑃<0.05 level.