Table 3.
Effect of Drs assumptions on simulated current output and substrate utilization. For each Drs assumption case, total current, acetate flux, and acetate concentration are given. Total current (A/m2) is based on conducted electron transfer from the entire biofilm. Acetate flux (mmol/cm2 day) is a measure of the average flux at the top of the biofilm in the 2 mm × 2 mm surface area NMR measurement voxel. Acetate concentration is given for the acetate available at the bottom of the biofilm in the same NMR measurement voxel. These three measurements were chosen to exemplify the effects of different Drs assumptions.
| De Assumption | Total Current (A/m2) |
Top of Biofilm Acetate Flux (mmol/cm2 day) |
Bottom of Biofilm Acetate Concentration (mM) |
|---|---|---|---|
| Non-variable density | |||
| Constant Drs | 2.65 | 0.28 | 1.55 |
| Linearly Decreasing Drs | 3.12 | 0.30 | 2.33 |
| Empirical Profile Drs | 2.88 | 0.29 | 1.18 |
| With variable density | |||
| Constant Drs | 2.65 | 0.28 | 1.55 |
| Linearly Decreasing Drs | 2.54 | 0.24 | 0.05 |
| Empirical Profile Drs | 2.53 | 0.25 | 0.21 |