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Figure 6 Predicted evolution of conversion factor X, total microbial biomass, and cell density with different maximum microbial densities at the water-oil interface and with different mean oil droplet size.

Here we compare three cases with the maximum microbial densities of 1, 5, and 10 cell/μm2 and with the initial concentrations of oil degrading microbes and oil droplets of 2.73 × 103 cells/ml and 0.4 mg/L, respectively.

In these cases, the maximum microbial density at the interface can be higher than 1 cell/μm2.

In this section we assess the effect of maximum microbial density at the water-oil interface.

The total amount of acting bacteria is then the available water-oil interface area times the maximum microbial density.

Another interesting observation is that initial bulk microbial concentration and maximum microbial density on water-oil interface have relatively smaller effects compared to dissolved oil.

This indicates that once the maximum microbial density is reached at the surface (Figure 6A3), further increasing the density will not make a difference.

As a result, the increase in maximum microbial density does not make a difference in biomass growth rates and in biodegradation rates.

For all previous cases we assumed the maximum microbial density to be 1 cell/μm2 using the average diameter of bacterial cell of 1 μm.

With the mean diameter of 100 μm, the biodegradation rate increases with increasing the maximum microbial density at the water-oil interface.

However, if the amount of water-oil interface area is relatively small and limits the biomass growth, the maximum microbial density makes a large difference (Figure 6A3).