| Polycyclic Aromatic Hydrocarbon (PAH) Remaining |
| Group/Treatment |
C (ppm) |
C + E5 (ppm) |
C+E10 (ppm) |
C+E20 (ppm) |
| Day 0 |
2462.88 ± 30.61 |
2462.88 ± 30.61 |
2462.88 ± 30.61 |
2462.88 ± 30.61 |
| Day 14 |
2339.86 ± 31.95 |
1241.88 ± 22.30 |
1370.98 ± 24.06 |
1076.40 ± 23.42 |
| Day 28 |
2106.56 ± 31.04 |
1077.60 ± 21.22 |
1160.78 ± 25.87 |
942.32 ± 22.50 |
|
Key:
C = Contaminated soil (control)
C + E5 = Contaminated soil incubated with 5 earthworms
C + E10 = Contaminated soil incubated with 10 earthworms
C + E20 = Contaminated soil incubated with 20 earthworms |
| Table 4: Effect of earthworm’s numbers on PAHs degradation in crude oil contaminated soil. |
