Table 5.
Hydrocarbon removal efficiency of HDB8, HDB9, and HDB18 with NH4NO3 at different C : N ratios: 70 : 1, 60 : 1, 50 : 1, and 40 : 1. Results are averages of 3 culture replicates and 3 separate GC analyses.
| C/N | C/N 70/1 | C/N 60/1 | C/N 50/1 | C/N 40/1 |
|---|---|---|---|---|
| HDB8 | ||||
| Total hydrocarbons removal (%) | 11 ± 2.6 | 30 ± 1.4 | 16 ± 2.5 | 20 ± 3.4 |
| LMW hydrocarbons (%) | 20 ± 3.4 | 39 ± 4.5 | 15 ± 2.2 | 20 ± 3.3 |
| MMW hydrocarbons (%) | 12 ± 3.1 | 29 ± 2.9 | 19 ± 3.7 | 20 ± 2.9 |
| HMW hydrocarbons (%) | 7 ± 2.2 | 24 ± 4.1 | 15 ± 2.2 | 20 ± 1.9 |
| HDB9 | ||||
| Total hydrocarbons removal (%) | 10 ± 1.6 | 21 ± 0.7 | 10 ± 1.2 | 38 ± 2.9 |
| LMW hydrocarbons (%) | 2 ± 0.9 | 35 ± 4.1 | 0 ± 0.5 | 45 ± 3.3 |
| MMW hydrocarbons (%) | 21 ± 2.5 | 21 ± 3.7 | 28 ± 3.4 | 37 ± 4.2 |
| HMW hydrocarbons (%) | 6 ± 1.7 | 6 ± 2.5 | 2 ± 1.2 | 32 ± 2.2 |
| HDB18 | ||||
| Total hydrocarbons removal (%) | 11 ± 2.1 | 10 ± 2.9 | 8 ± 1.7 | 13 ± 2.1 |
| LMW hydrocarbons (%) | 0 ± 0.5 | 16 ± 3.0 | 4 ± 0.8 | 23 ± 1.7 |
| MMW hydrocarbons (%) | 29 ± 3.1 | 14 ± 1 | 1 ± 0.5 | 16 ± 1.7 |
| HMW hydrocarbons (%) | 6 ± 2.1 | 4 ± 0.6 | 19 ± 2.1 | 7 ± 1.7 |
LMW: low molecular weight; MMW: medium molecular weight; HMW: high molecular weight.