Table 1 Life cycle inventory of a hydroponic system operating for 30 days.
From: Spatial heterogeneity in the properties of hydroponic wheat fodder and its sustainability
Items | YP, kg kg−1 | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
3 | 4 | 5 | 6 | 7 | ||||||
Total | Per FU | Total | Per FU | Total | Per FU | Total | Per FU | Total | Per FU | |
Tap water | ||||||||||
Seed soaking, m3 | 1.20 | 0.084 | 1.2 | 0.063 | 1.2 | 0.050 | 1.2 | 0.042 | 1.2 | 0.036 |
Irrigation, m3 | 144.0 | 10.1 | 144.0 | 7.6 | 144.0 | 6.1 | 144.0 | 5.0 | 144.0 | 4.3 |
Electricity | ||||||||||
Heating, kWh | 1416.0 | 99.2 | 1416.0 | 74.4 | 1416.0 | 59.5 | 1416.0 | 49.6 | 1416.0 | 42.5 |
Lighting, kWh | 2160.0 | 151.4 | 2160.0 | 113.5 | 2160.0 | 90.8 | 2160.0 | 75.7 | 2160.0 | 64.9 |
Air movement, kWh | 54.0 | 3.8 | 54.0 | 2.8 | 54.0 | 2.3 | 54.0 | 1.9 | 54.0 | 1.6 |
Dehumidifier, kWh | 144.0 | 10.1 | 144.0 | 7.6 | 144.0 | 6.1 | 144.0 | 5.0 | 144.0 | 4.3 |
Irrigation, kWh | 8.4 | 0.6 | 8.4 | 0.4 | 8.4 | 0.4 | 8.4 | 0.3 | 8.4 | 0.3 |
Raw materials | ||||||||||
Wheat seeds, kg | 4756.04 | 333.33 | 4756.04 | 250.00 | 4756.04 | 200.00 | 4756.04 | 166.67 | 4756.04 | 142.86 |
Sodium hypochlorite, kg | 49.98 | 3.50 | 49.98 | 2.627 | 49.98 | 2.102 | 49.98 | 1.751 | 49.98 | 1.501 |
Transportation | ||||||||||
Seeds, km | 1.2 | 0.084 | 1.2 | 0.063 | 1.2 | 0.050 | 1.2 | 0.042 | 1.2 | 0.036 |
Constructiona | ||||||||||
Growth stands | ||||||||||
Aluminum, kg | 1.64 | 0.11 | 1.64 | 0.09 | 1.64 | 0.07 | 1.64 | 0.06 | 1.64 | 0.05 |
PVC, kg | 19.56 | 1.37 | 19.56 | 1.03 | 19.56 | 0.82 | 19.56 | 0.69 | 19.56 | 0.59 |
Lighting | ||||||||||
Aluminum cast alloy, kg | 0.1233 | 0.0086 | 0.1233 | 0.0065 | 0.1233 | 0.0052 | 0.1233 | 0.0043 | 0.1233 | 0.0037 |
Steel, kg | 0.00263 | 0.000184 | 0.00263 | 0.000138 | 0.00263 | 0.000111 | 0.00263 | 9.22E−05 | 0.00263 | 7.90E−05 |
Copper, kg | 0.00025 | 0.0000173 | 0.00025 | 1.296E−05 | 0.00025 | 1.04E−05 | 0.00025 | 8.64E−06 | 0.00025 | 7.41E−06 |
PVC, kg | 0.00953 | 0.000668 | 0.00953 | 0.000501 | 0.00953 | 0.000401 | 0.00953 | 0.000334 | 0.00953 | 0.000286 |
Glass, kg | 0.00945 | 0.000662 | 0.00945 | 0.000497 | 0.00945 | 0.000397 | 0.00945 | 0.000331 | 0.00945 | 0.000284 |
Irrigation | ||||||||||
PVC, kg | 0.274 | 0.0192 | 0.274 | 0.0144 | 0.274 | 0.0115 | 0.274 | 0.0096 | 0.274 | 0.0082 |
Cast iron, kg | 0.123 | 0.00864 | 0.123 | 0.00648 | 0.123 | 0.00518 | 0.123 | 0.00432 | 0.123 | 0.00370 |
El. Motor 2.4 kW, piece | 0.0164 | 0.00115 | 0.0164 | 0.00086 | 0.0164 | 0.00069 | 0.0164 | 0.00058 | 0.0164 | 0.00049 |
Outputs | ||||||||||
HWF, t | 14.27 | 19.02 | 23.78 | 28.54 | 33.29 | |||||
