μ (d-1) Td (d) DR12 mgl-1d-1 DR21 mgl-1d-1 PD12 (%) PD21 (%)
FSAE40 0.17 4.08 177.42 53.18 78 95
USAE40 0.13 5.33 75.23 40.28 66 93
FSW-20-50 0.14 4.95 207.14 59.89 79 96
USW-20-50 0.13 5.33 74.37 48.89 62 92
μ- specific growth rate; Td - doubling time; DR12- Degradation rate between day 0 and day 12; DR21- degradation rate between day 12 and day 21; PD12- percentage of oil degraded in the first 12 day; PD21- overall percentage of oil degraded during 21 day incubation.
Table 1: Kinetics of Degradation of used and fresh Engine oils by Pseudomonas aeruginosa LP 5.