Table 4 Inlet values and percentage removal (%R) of nutrients monitored on monthly basis for hydroponic treatment units (HUs) and control unit (CTRL)
Parameter | Description | Time (month) | |||||||
|---|---|---|---|---|---|---|---|---|---|
23-May-15 | 23-Jun-15 | 23-Jul-15 | 23-Aug-15 | 23-Sep-15 | 23-Oct-15 | 23-Nov-15 | |||
TKN | Inlet (in mg l−1) | 19 | 43 | 35 | 28 | 41 | 29 | 38 | |
Outlet | HUs (%R) | 72 | 79 | 80 | 59 | 72 | 70 | 54 | |
CTRL (%R) | 42 | 42 | 34 | 38 | 41 | 41 | 45 | ||
NH4+-N | Inlet (in mg l−1) | 18 | 24 | 27 | 31 | 20 | 23 | 25 | |
Outlet | HUs (%R) | 42 | 54 | 56 | 65 | 45 | 54 | 51 | |
CTRL (%R) | 22 | 25 | 33 | 26 | 20 | 13 | 32 | ||
NO3−-N | Inlet (in mg l−1) | 16 | 9.8 | 11.8 | 17 | 13 | 8.7 | 14.8 | |
Outlet | HUs (%R) | 47 | 56 | 58 | 47 | 54 | 47 | 50 | |
CTRL (%R) | 25 | 31 | 32 | 24 | 23 | 23 | 26 | ||
PO4−3-P | Inlet (in mg l−1) | 13 | 11 | 16 | 14 | 8 | 19 | 23 | |
Outlet | HUs (%R) | 59 | 56 | 63 | 70 | 57 | 51 | 53 | |
CTRL (%R) | 23 | 27 | 40 | 37 | 20 | 35 | 39 | ||