| AD | Anaerobic digestion |
| ADM1 | Anaerobic digestion model no. 1 |
| ADM1-SO | Anaerobic digestion model no 1: sulfur oxidation |
| COD | Chemical oxygen demand |
| DO | Dissolved oxygen |
| HRT | Hydraulic retention time |
| IWA | International water association |
| ORP | Oxidation-reduction potential |
| ppm | Parts per million |
| SOB | Sulfur oxidizing bacteria |
| TS | Total solids |
| UASB | Upflow anaerobic sludge blanket |
| VFA | Volatile fatty acid |
| VS | Volatile solids |
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