| NH3 | Ammonia |
| BNR | Biological Nutrient Removal |
| CaO | Calcium oxide (Quick Lime) |
| Ca(OH)2 | Calcium Hydroxide (Hydrated Lime) |
| CIEP | Chief Inspectorate of Environmental Protection |
| H2S | Hydrogen Sulphide |
| HI | Risk Assessment |
| LTEL (NDS in Poland) | Long-Term Exposure Limit |
| MBR | Membrane Bioreactor |
| MBBR | Moving Bed Biofilm Reactor |
| PAH | Polycyclic Aromatic Hydrocarbons |
| PCB | Polychlorinated Biphenyls |
| PIEP | Provincial Inspectorate of Environmental Protection |
| STEL (NDSCh in Poland) | Short-Term Exposure Limit |
| WWTP | Wastewater Treatment Plant |
| VOCs | Volatile Organic Compounds |
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