Table 2 Ecotechnologies for recovery and reuse of C, P and N from agricultural waste streams included in the evidence base
Category of ecotechnology | # | (%) | Category of ecotechnology | # | (%) |
|---|---|---|---|---|---|
Soil amendments | 27 | 15 | Aquaponics | 2 | 1 |
Anaerobic digestion | 23 | 13 | Constructed wetlands | 2 | 1 |
(Vermi)composting | 22 | 12 | Microbial fuel cells | 2 | 1 |
Combination | 20 | 11 | Scrubber for NH4 recovery | 2 | 1 |
Struvite precipitation | 15 | 8 | Ammonia stripping | 1 | 1 |
Crop management | 11 | 6 | Electrocoagulation | 1 | 1 |
Cover crops | 9 | 5 | Gasification | 1 | 1 |
Membrane filtration | 9 | 5 | Nanoparticles to control P leaching | 1 | 1 |
Manure treatment/management | 8 | 5 | Nutrient biofilters | 1 | 1 |
Industry systems | 5 | 3 | P removal from drainage ditches | 1 | 1 |
Pyrolysis | 5 | 3 | Source separation | 1 | 1 |
Bioreactors | 4 | 2 | Algal turf scrubber | 1 | 1 |
Microalgae cultivation | 3 | 2 | Number of studies | 177 | 100 |