Table 6.
Mean biodegradation percentages of acenaphthene and fluorene by the PAH degrading microorganisms at the Stirred Tank Bioreactor scale.
| Reactor | Initial concentration (ppm) | Residual concentration (ppm) | SD | Percentage degradation (%) |
|---|---|---|---|---|
| O (Ace + R. ornithinolytica) | 50.00 | 0.68 | 0.01 | 98.60 |
| P (Ace + S. marcescens) | 50.00 | 2.15 | 0.30 | 95.70 |
| Q (Ace + B. megaterium) | 50.00 | 4.91 | 0.90 | 90.20 |
| R (Ace + A. hydrophila) | 50.00 | 0.03 | 0.06 | 99.90 |
| S (ace + cocktail) | 50.00 | 0.15 | 0.93 | 99.60 |
| T (fluorene + R. ornithinolytica) | 50.00 | 0.02 | 0.09 | 99.90 |
| U (fluorene + S. marcescens) | 50.00 | 0.99 | 0.36 | 97.90 |
| V (fluorene + B. megaterium) | 50.00 | 0.82 | 0.23 | 98.40 |
| W (fluorene +A. hydrophila) | 50.00 | 0.24 | 0.36 | 99.50 |
| X (fluorene + cocktail) | 50.00 | 0.39 | 1.6 | 99.20 |
Key: Ace- acenaphthene, Cocktail: Raoultella ornithinolytica, Serratia marcescens, Bacillus megaterium and Aeromonas hydrophila.