|
Total Petroleum Hydrocarbon (TPH) Remaining |
Group/ Treatment |
C (mg/kg) |
C + E5 (mg/kg) |
C + E10 (mg/kg) |
C+E20 (mg/kg) |
Day 0 |
15056.86 ± 92.11 |
15056.86 ± 92.11 |
15056.86 ± 92.11 |
15056.86 ± 92.11 |
Day 14 |
12275.36 ± 28.03 |
13167.91 ±108.82 |
9237.21 ± 65.49 |
11031.86 ± 31.94 |
Day 28 |
7590.88 ± 1050.4 |
7241.36 ± 86.3 |
6554.89 ± 61.11 |
4162.53. ± 54.49 |
|
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 2: Effect of earthworms’ numbers on TPH degradation in crude oil contaminated soil. |