CS | T20 | T40 | P value | |
---|---|---|---|---|
Ammonia nitrogen (mg/L) | 0.57 ± 0.11b | 0.46 ± 0.08a | 0.54 ± 0.12b | 0.005 |
Nitrite nitrogen (mg/L) | 0.42 ± 0.06b | 0.30 ± 0.07a | 0.35 ± 0.08a | 0.001 |
Nitrate nitrogen (mg/L) | 39.2 ± 6.1 | 44.0 ± 3.1 | 38.7 ± 4.3 | 0.089 |
Total suspended solid (mg/L) | 2.12 ± 0.19b | 1.31 ± 0.25a | 1.34 ± 0.05a | 0.036 |
Total residual oxidant (mg/L) | NAa | 0.12 ± 0.09a | 0.25 ± 0.12b | 0.000 |