| Season | Date | COD | TC | TN | |||||||||
| Day 0 (mg/L) | Day 14 (mg/L) | Removal rate (%) | Average removal rate (%) | Day 0 (mg/L) | Day 14 (mg/L) | Removal rate (%) | Average removal rate (%) | Day 0 (mg/L) | Day 14 (mg/L) | Removal rate (%) | Average removal rate (%) | ||
| Spring | April 16 | 3.4 | 3.4 | 0.0 | 7.5 | 3.5 | 3.5 | 0.0 | 0.7 | 0.1 | 0.1 | 0.0 | 18.0 |
| May 1 | 3.2 | 3.2 | 0.0 | 3.5 | 3.5 | 0.0 | 0.3 | 0.2 | 34.4 | ||||
| May 16 | 4.0 | 3.1 | 22.5 | 4.9 | 4.8 | 2.0 | 0.4 | 0.3 | 37.5 | ||||
| Summer | June 1 | 3.8 | 3.2 | 15.8 | 24.6 | 5.9 | 4.3 | 27.1 | 20.5 | 0.3 | 0.3 | 0.0 | 28.0 |
| June 16 | 5.0 | 3.0 | 40.0 | 5.7 | 4.1 | 28.1 | 0.8 | 0.1 | 81.8 | ||||
| July 1 | 8.1 | 7.1 | 12.4 | 5.6 | 5.2 | 7.1 | 0.4 | 0.4 | 0.0 | ||||
| July 16 | 8.0 | 5.8 | 27.5 | 6.2 | 5.7 | 8.1 | 0.6 | 0.3 | 49.2 | ||||
| August 1 | 6.1 | 5.2 | 14.8 | 5.4 | 4.7 | 13.0 | 0.6 | 0.6 | 0.0 | ||||
| August 16 | 8.1 | 5.1 | 37.0 | 6.8 | 4.1 | 39.7 | 0.5 | 0.3 | 37.0 | ||||
| Autumn | September 1 | 6.6 | 5.1 | 22.7 | 23.0 | 5.0 | 4.7 | 6.0 | 18.6 | 0.3 | 0.3 | 0.0 | 12.8 |
| September 16 | 13.4 | 10.4 | 22.4 | 7.1 | 5.6 | 21.1 | 0.7 | 0.6 | 6.2 | ||||
| October 1 | 8.5 | 6.0 | 29.4 | 5.5 | 4.5 | 18.2 | 0.8 | 0.4 | 54.4 | ||||
| October 16 | 6.5 | 4.8 | 26.2 | 5.2 | 3.6 | 30.8 | 0.3 | 0.3 | 16.1 | ||||
| November 1 | 6.7 | 4.9 | 26.9 | 4.7 | 3.4 | 27.7 | 0.3 | 0.3 | 0.0 | ||||
| November 16 | 4.3 | 4.3 | 0.0 | 3.8 | 3.5 | 7.9 | 0.5 | 0.5 | 0.0 | ||||
| Winter | December 1 | 2.8 | 1.9 | 33.2 | 21.7 | 3.3 | 1.9 | 42.4 | 17.8 | 0.4 | 0.2 | 47.5 | 21.5 |
| December 16 | 2.0 | 2.0 | 0.0 | 2.1 | 2.1 | 0.0 | 0.3 | 0.3 | 0.0 | ||||
| January 16 | 3.7 | 2.0 | 46.0 | 2.8 | 2.2 | 21.4 | 0.3 | 0.2 | 40.7 | ||||
| February 1 | 3.3 | 3.3 | 0.0 | 2.6 | 2.3 | 11.5 | 0.3 | 0.2 | 19.2 | ||||
| February 16 | 4.4 | 3.1 | 29.6 | 2.9 | 2.5 | 13.8 | 0.3 | 0.3 | 0.0 | ||||
| Average | 19.2 | 14.4 | 20.1 | ||||||||||