| ASP | Activated sludge process |
| AOPs | Advanced oxidation processes |
| BET | Bioelectrochemical treatment |
| ClO2 | Chlorine dioxide |
| COD | Chemical oxygen demand |
| CWs | Constructed wetlands |
| DIET | Direct interspecies electron transfer |
| DAO | Direct anodic oxidation |
| EES | Ecologically engineered systems |
| EO | Electrochemical oxidation |
| EABs | Electrochemically active bacteria |
| EET | Extracellular electron transfer |
| HRT | Hydraulic retention time |
| H2O2 | Hydrogen peroxide |
| OH * | Hydroxyl radicals |
| OCl− | Hypochlorite |
| IAO | Indirect anodic oxidation |
| IET | Interspecies electron transfer |
| O * | Nascent oxygen |
| O3 | Ozone |
| POPs | Persistent organic pollutants |
| SBR | Sequential batch process |
| SDGs | Sustainable development goals |
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