| Ecotechnology | Belgium | Canada | Finland | United States | No stated country |
|---|
| (Vermi)composting | 2 | | 1 | | 9 |
| Ammonia stripping | | | | 1 | |
| Anaerobic digestion | 2 | | | 3 | 3 |
| Aquaponics | 1 | | | | |
| Bioreactors | 1 | | 2 | |
| Combination | 1 | | 4 | 2 | 4 |
| Constructed wetlands | | | | 2 | |
| Cover crops | | 1 | | 7 | |
| Crop management | | 2 | | 2 | 1 |
| Electrocoagulation | | | | 1 | |
| Gasification | | | | | |
| Industry systems | | | | 2 | |
| Manure treatment/management | | 2 | 2 | | 1 |
| Membrane filtration | | 1 | | 4 | 1 |
| Microalgae cultivation | | | | | |
| Microbial fuel cells | | | | | |
| Nanoparticles to control P leaching | | | | 1 | 1 |
| Nutrient biofilters | | | | 1 | |
| P removal from drainage ditches | 1 | | | | |
| Pyrolysis | | | | 2 | |
| Scrubber for NH4 recovery | | | | 1 | 1 |
| Source separation | | | | 1 | 1 |
| Struvite precipitation | | 4 | 2 | 1 | |
| Soil amendments | 4 | 5 | 5 | 3 | 5 |
| Algal turf scrubber | | | | 1 | 1 |
