Table 4 Ionic composition of feed and draw solutions
| Â | NH4 (mg/l) | NO3 (mg/l) | PO4 (mg/l) | SO4 (mg/l) | K (mg/l) | Ca (mg/l) | Mg (mg/l) | Na (mg/l) | Cl (mg/l) | TDS (ppm) | Osmotic Pressure (bar) |
|---|---|---|---|---|---|---|---|---|---|---|---|
DSinitial (Part B of the hydroponic nutrient solution) | 225 | 2940 | 1815 | Below detectable limit | 6510 | Below detectable limit | Below detectable limit | 180 | 270 | 10,125 | 5.1 |
DSfinal | 255 | 1395 | 1395 | Below detectable limit | 3690 | Below detectable limit | Below detectable limit | 450 | 675 | 6465 | 3.58 |
FSinitial | 160 | 70 | 90 | Below detectable limit | 60 | Below detectable limit | Below detectable limit | 800 | 1320 | 2410 | 1.76 |
FSfinal | 170 | 380 | 400 | Below detectable limit | 590 | Below detectable limit | Below detectable limit | 600 | 970 | 2710 | 1.77 |