influence of physico-chemical parameters on
degradation of lubricating oil
With the exception of B. mycoides which showed highest
degradation (33.33%) at 35oC, all the other isolates as
well as the mixed culture exhibited highest degradation at
32oC (Figure 5). The degradation potential of S. marcescens
and the mixed culture dropped with an increase in
nutrient concentration up until phosphate (4 ppm)/ nitrate
(50 ppm) and thereafter increased with an increase in
phosphate/nitrate concentration (Figure 6). B. mycoides
exhibited an increase in degradation which dropped
slightly with further increase in nutrient concentration.
The degradation potential of P. fluorescens increased
with increase in nutrients.