Polycyclic Aromatic Hydrocarbon (PAH) Remaining Group/ Treatment C (ppm) C+A (ppm) C+A+E5 (ppm) C+A+E10 (ppm) C+A+E20 (ppm) Day 0 2462.88 ± 30.61 2462.88 ± 30.61 2462.88 ± 30.61 2462.88 ± 30.61 2462.88 ± 30.61 Day 14 2339.86 ± 312.96 1398.48 ± 30.38 636.25 ± 25.92 397.28 ± 27.52 406.37 ± 23.78 Day 28 2106.56 ± 308.04 1275.99 ± 21.82 375.12 ± 25.87 142.37 ± 22.95 137.92 ± 26.73

Key: C = Contaminated soil (control) C + A = Contaminated soil + brewery mash C + A + E5 = Contaminated soil + brewery mash + 5 earthworms C + A + E10= Contaminated soil+ brewery mash+ 10 earthworms C + A + E20 = Contaminated soil + brewery mash + 20 earthworm

Table 5: Effect of earthworm’s numbers on PAHs degradation in crude oil contaminated soil amended with brewery mash.