Table 1.
Ca2+ leaching in the different groups at 5 min and 1 h.
| 5 min |
1 h |
||||||
|---|---|---|---|---|---|---|---|
| pH | NH4+ (mg/L) | Ca2+@@@@(mg/L) | Improved folds vs. control group of 0 mg/L NH4+ at pH 7.0 | pH | NH4+ (mg/L) | Ca2+@@@@(mg/L) | Improved folds vs. control group of 0 mg/L NH4+ at pH 7.0 |
| 5.0 | 0 | 78.0 | 321% | 5.0 | 0 | 80.1 | 305% |
| 5.0 | 300 | 103.8 | 427% | 5.0 | 300 | 96.9 | 369% |
| 5.0 | 600 | 117.3 | 483% | 5.0 | 600 | 110.0 | 419% |
| 5.0 | 900 | 127.3 | 524% | 5.0 | 900 | 106.2 | 405% |
| 6.0 | 0 | 25.5 | 105% | 6.0 | 0 | 25.5 | 97% |
| 6.0 | 300 | 43.6 | 180% | 6.0 | 300 | 41.4 | 158% |
| 6.0 | 600 | 58.3 | 240% | 6.0 | 600 | 53.3 | 203% |
| 6.0 | 900 | 62.6 | 258% | 6.0 | 900 | 54.0 | 206% |
| 7.0 | 0 | 24.3 | 100% | 7.0 | 0 | 26.2 | 100% |
| 7.0 | 300 | 36.5 | 150% | 7.0 | 300 | 34.0 | 129% |
| 7.0 | 600 | 52.4 | 216% | 7.0 | 600 | 44.3 | 169% |
| 7.0 | 900 | 57.1 | 235% | 7.0 | 900 | 47.3 | 180% |