TABLE 1.
Summary of experimental conditions during five PPTs performed to evaluate methanogenesis in a PHC-contaminated aquifer
| Test | Substrate injected | Substrate concentration, C0 (mM) | Br− injection concentration (mM) | Injection volume (liters) | Injection duration (h) | Initial incubation perioda (h) | Total extracted volume (liters) | Total test duration (h) |
|---|---|---|---|---|---|---|---|---|
| PPTac | Acetate | 2.11 | 0.53 | 1,000 | 1.9 | 20.4 | 1,000 | 70.8 |
| PPTfo | Formate | 2.05 | 0.59 | 500 | 0.7 | 2.3 | 1,000 | 6.9 |
| PPTH2 | H2 | 0.61 | 0.50 | 500 | 0.9 | 1.8 | 750 | 5.4 |
| PPTme | Methanol | 1.99 | 0.43 | 500 | 0.8 | 2.3 | 750 | 27.0 |
| PPTBESb | H2 | 0.39 | 0.47 | 500 | 0.6 | 2.0 | 750 | 4.2 |
a
Initial incubation period is defined as the time between the end of injection and the beginning of extraction.
b
In PPTBES, BES as a specific inhibitor of methanogenesis was added at a concentration of 2.15 mM.