| Biofiltration | Media filter | Green roof | Surface sand filter | Perimeter sand filter | Underground sand filter | Enhanced sand filter | Permeable pavement w/underdrain | ||
|---|---|---|---|---|---|---|---|---|---|
| Pretreatment | |||||||||
| HYDRAULIC PROCESSES | Attenuation | X | X | ||||||
| Infiltration / Runoff reduction | |||||||||
| Evaporation | |||||||||
| Transpiration | X | ||||||||
| PHYSICAL PROCESSES | Screening | ||||||||
| Sedimentation | X | ||||||||
| Filtration | X | X | X | X | X | X | X | X | |
| Flotation / Skimming | |||||||||
| Laminar Separation | |||||||||
| Swirl concentration | |||||||||
| BIOLOGICAL PROCESSES | Plant metabolism | X | X | ||||||
| Pathogen die-off | X | X | |||||||
| Nitrification / denitrification | X | X | |||||||
| CHEMICAL PROCESSES | Precipitation | ||||||||
| Coagulation | |||||||||
| Sorption/Ion Exchange | X | X | X | X | |||||
| OTHER | Thermal / temperature | X |