Table 3 Physicochemical analysis of wastewater during HRT.
From: Domestic wastewater treatment by Pistia stratiotes in constructed wetland
Parameters | Initial levels | HRT (days) | Units | ||
|---|---|---|---|---|---|
10 | 20 | 30 | |||
Color | Grey Black | – | – | Colorless | NA |
Odor | Offensive | – | – | Odorless | NA |
pH* | 6.7 | 6.9 | 7.15 | 7.5 | – |
TDS | 1200 | 800 | 455 | 200 | mg/L |
TSS | 850 | 500 | 305 | 150 | mg/L |
Chloride | 200 | 155 | 95 | 50 | mg/L |
Sulfate | 1000 | 667 | 300 | 227 | mg/L |
Total O&G | 98 | 50 | 33 | 25 | mg/L |
BOD | 195 | 130 | 72 | 36 | mg/L |
COD | 225 | 150 | 83 | 41 | mg/L |
Ammonia | 8.4 | 5.5 | 2.8 | 1.35 | mg/L |
