| Byproduct material | P added | P added | Average P removed | Average P removed | p-value* | ||
|
| mg∙L−1 | - - - - - mg - - - - - | % | ||||
| Red mud iron filter cake | |||||||
|
| 60 | 2.4 | 2.37 | 98.7 | 0.98 | ||
|
| 90 | 3.6 | 3.55 | 98.7 | |||
|
| 120 | 4.8 | 4.74 | 98.7 | |||
|
| 150 | 6.0 | 5.82 | 96.9 | |||
|
| 200 | 8.0 | 7.73 | 96.7 | |||
|
| 250 | 10.0 | 9.53 | 95.3 | |||
|
| 325 | 13.0 | 12.07 | 92.8 | |||
|
| 425 | 17.0 | 15.08 | 88.7 | |||
|
| 500 | 20.0 | 17.15 | 85.8 | |||
|
| 1000 | 40.0 | 24.02 | 60.1 | |||
| Water treatment residual | |||||||
|
| 50 | 2.0 | 1.8 | 92.1 | 0.97 | ||
|
| 75 | 3.0 | 2.8 | 92.4 | |||
|
| 100 | 4.0 | 3.5 | 86.6 | |||
|
| 150 | 6.0 | 4.5 | 74.9 | |||
|
| 200 | 8.0 | 6.0 | 75.2 | |||
|
| 250 | 10.0 | 7.3 | 73.1 | |||
|
| 300 | 12.0 | 7.5 | 62.6 | |||
|
| 350 | 14.0 | 8.6 | 61.4 | |||