| Taxonomic group | Reactor A | Reactor B | Reactor C | Reactor D | Original sediment |
| Acinetobacter | 4 | 1 | 2 | 1 | 14 |
| Aminobacterium | 13 | 11 | 0 | 2 | 5 |
| Anaerobaculum | 3 | 2 | 0 | 11 | 0 |
| Anaerolinea | 14 | 3 | 1 | 1 | 20 |
| Anaeromyxobacter | 16 | 3 | 79 | 10 | 13 |
| Aquicella | 1 | 1 | 0 | 0 | 78 |
| Azoarcus | 13 | 10 | 9 | 14 | 0 |
| Bellilinea | 87 | 66 | 10 | 43 | 1 |
| Blastopirellula | 52 | 30 | 11 | 7 | 56 |
| BRC1_genera_incertae_sedis | 4 | 8 | 0 | 0 | 7 |
| Caldilinea | 9 | 4 | 0 | 3 | 16 |
| Caloramator | 7 | 0 | 0 | 23 | 2 |
| Castellaniella | 1 | 16 | 10 | 0 | 0 |
| Comamonas | 5 | 0 | 8 | 0 | 0 |
| Dechloromonas | 5 | 0 | 0 | 0 | 11 |
| Desulfobacca | 5 | 4 | 1 | 2 | 0 |
| Desulfobacterium | 7 | 0 | 4 | 0 | 0 |
| Desulfobulbus | 14 | 145 | 18 | 96 | 4 |
| Desulfomonile | 0 | 7 | 3 | 2 | 4 |
| Desulforhabdus | 2 | 0 | 2 | 4 | 3 |
| Desulfuromonas | 1 | 43 | 0 | 13 | 1 |
| Devosia | 1 | 16 | 6 | 4 | 1 |
| Enhygromyxa | 1 | 0 | 0 | 0 | 10 |
| Escherichia/Shigella | 24 | 15 | 2 | 2 | 43 |
| Fluviicola | 0 | 0 | 0 | 0 | 17 |
| Gemmatimonas | 0 | 0 | 0 | 1 | 34 |
| Geobacter | 513 | 2307 | 3131 | 1762 | 10 |
| Geotoga | 28 | 1 | 0 | 738 | 4 |
| Gp16 | 60 | 18 | 1 | 11 | 63 |
| Gp17 | 31 | 5 | 3 | 0 | 91 |
| Gp18 | 81 | 13 | 3 | 6 | 20 |
| Gp21 | 7 | 1 | 2 | 3 | 0 |
| Gp23 | 22 | 1 | 2 | 2 | 3 |
| Gp25 | 3 | 2 | 0 | 1 | 4 |