| A2O |
Anaerobic-anoxic-aerobic plant |
| AB |
A-stage (carbon removal) B-stage (nitrogen removal) plant |
| ACP |
Amorphous calcium phosphate |
| AHO |
Carbon adsorption heterotroph organism |
| ALK |
Alkalinity |
| AMETO |
Acidoclastic methanogen |
| AMX |
Anammox organism |
| AOB |
Aerobic ammonia oxidizer |
| AOP |
Advanced oxidation process |
| AS |
Activated sludge |
| ASM |
Activated sludge model |
| ASRO |
Acidoclastic sulfate-reducing organism |
| AUR |
Ammonia uptake rate |
| BAF |
Biological aerated filter |
| BNR |
Biological nutrient removal plant |
| BOD |
Biological oxygen demand |
| BSH |
Brushite |
| CASTO |
Carbon storing organism |
| CHP |
Combined heat and power plant |
| COD |
Chemical oxygen demand |
| CSTR |
Completely stired tank reactor |
| CVAR |
Calculated variable |
| DAF |
Dissolved air flotation |
| DM |
Dry matter |
| DO |
Dissolved oxygen |
| GAO |
Glycogen accumulating organism |
| GLY |
Glycogen |
| HAO |
Hydrous aluminium oxide |
| HFO |
Hydrous ferric oxide |
| HMETO |
Hydrogenotrophic methanogen |
| HPO |
High purity oxygen |
| HRT |
Hydraulic retention time |
| HSRO |
Hydrogenotrophic sulfate-reducing organism |
| IS |
Ionic strength |
| MABR |
Membrane aerated biofilm reactor |
| MBBR |
Moving bed biofilm reactor |
| MBR |
Membrane biofilm reactor |
| MEOL |
Methanol |
| MEOLO |
Anoxic methanol utilizer |
| MLE |
Modified Ludzack-Ettinger plant |
| MLSS |
Mixed liquor suspended solids |
| N2UR |
Nitrite uptake rate |
| N3UR |
Nitrate uptake rate |
| NITO |
Aerobic nitrifying organism |
| NOB |
Nitrite oxidize |
| NTP |
Normal temperature pression conditions (20 °C, 1 atm) |
| NUR |
Nitrate uptake rate |
| OHO |
Ordinary heterotrophic organism |
| ORP |
Oxydo reduction potential |
| OTE |
Oxygen transfer efficiency |
| OTR |
Oxygen transfer rate |
| OUR |
Oxygen uptake rate |
| PAO |
Phosphorus accumulating organism |
| PFR |
Plug-flow reactor |
| PHA |
Polyhydroxyalkanoates |
| PID |
Proportional–integral–derivative controller |
| PP |
Polyphosphate |
| PRR |
Phosphorus release rate |
| PUR |
Phosphorus uptake rate |
| rbCOD |
Readily biodegradable COD |
| RO |
Reverse osmosis |
| SBR |
Sequenced batch reactor |
| SCCOD |
Filtered chemical oxygen demand |
| SCOD |
Filtered flocculated chemical oxygen demand |
| SOO |
Sulfur-oxidizing organism |
| SOTE |
Standard oxygen transfer efficiency |
| SOTR |
Standard oxygen transfer rate |
| SRT |
Sludge retention time |
| SSOTE |
Specific standard oxygen transfer efficiency |
| STP |
Standard temperature pression conditions (0 °C, 1 atm) |
| STR |
Struvite |
| SV |
State variable |
| THP |
Thermal hydrolysis process |
| TKN |
Total Kjeldahl nitrogen |
| TN |
Total nitrogen |
| TOC |
Total organic carbon |
| TP |
Total phosphorus |
| TSS |
Total suspended solids |
| UASB |
Upflow anaerobic sludge blanket |
| VFA |
Volatile fatty acid |
| Vivi |
Vivianite |
| VS |
Volatile solids |
| VSR |
Volatile solids reduction |
| VSS |
Volatile suspended solids |
| WAS |
Waste activated sludge |
