Table 2.
Initial and residual contents of total aliphatic hydrocarbons (TAHs), unidentified hydrocarbons, alkanes (∑nC8–nC22 and ∑nC23–nC35) and polycyclic aromatic hydrocarbons (∑PAHs), unidentified PAHs, and distinguished PAH groups. The data are presented as the mean values ± SD (n = 4).
| Hydrocarbons | Content ± SD (mg/kg d.w. soil) | ||||
|---|---|---|---|---|---|
| Initial (0 Day) |
After 60 Days | ||||
| Control | BS | BA-C1 | BA-C2 | ||
| Total aliphatic hydrocarbons (TAHs) | 17757.2 ± 1175.2 AB | 17467.2 ± 1049.5 CD | 11372.0 ± 699.8 E | 5290.9 ± 297.7 ACF | 2310.3 ± 126.2 BDEF |
| Unidentified aliphatic hydrocarbons | 5496.6 ± 304.5 | 5512.6 ± 286.0 | 3779.2 ± 245.4 | 1647.5 ± 108.2 | 707.3 ± 49.9 |
| ∑nC8–nC22 | 9324.1 ± 655.3 GH | 8983.8 ± 564.1 IJ | 5274.2 ± 316.9 K | 2254.5 ± 109.6 GIL | 861.2 ± 39.3 HJKL |
| ∑nC23–nC35 | 2936.5 ± 215.4 M | 2917.0 ± 199.4 N | 2283.7 ± 137.5 O | 1388.9 ± 79.9 | 741.8 ± 37.0 MNO |
| ∑PAHs | 2777.5 ± 211.2 a | 2785.6 ± 162.4 b | 2120.8 ± 118.6 c | 988.7 ± 54.3 | 411.6 ± 21.9 abc |
| Unidentified PAHs | 455.8 ± 32.7 | 483.2 ± 24.1 | 387.2 ± 19.8 | 229.4 ± 11.9 | 99.7 ± 4.5 |
| ∑Two- and three-ring PAHs | 1459.5 ± 207.6 de | 1413.2 ± 182.9 fg | 1000.0 ± 129.6 h | 329.6 ± 41.3 df | 112.0 ± 14.7 egh |
| ∑Four- and five- ring PAHs | 829.1 ± 79.0 i | 856.4 ± 86.5 j | 701.95 ± 62.0 k | 401.7 ± 26.6 | 177.4 ± 6.6 ijk |
| ∑Six-ring PAHs | 32.2 ± 3.9 | 32.8 ± 3.3 | 31.7 ± 3.3 | 28.1 ± 2.5 | 22.5 ± 1.4 |
Control: untreated microcosms, BS: biostimulated microcosms, BA-C1 and BA-C2: microcosms bioaugmented with the bacterial community C1 and the mixed culture C2, respectively. Letters (A–O and a–k) indicate the statistically significant differences between treatments.