Table 2.
Effect of CH existing forms and pH on lignin removal in CH treatment process.
| CH Dosage (%) | pH | a Lignin Removal Using CH in Solid and Liquid Forms (%) | b Lignin Removal Using CH in Liquid Form (%) |
|---|---|---|---|
| 0.2 | 6.6 | 6.7 | 3.1 |
| 0.4 | 9.0 | 24.0 | 5.0 |
| 0.6 | 10.0 | 34.3 | 9.2 |
| 0.8 | 11.0 | 37.1 | 9.8 |
| 1.2 | 11.5 | 38.0 | 10.1 |
| 2.0 | 12.0 | 38.6 | 10.2 |
Note: a means that CH powder was added into PHL to remove lignin by the formation of lignin-calcium absorption and lignin-calcium complexes. b means that the dissolved CH solution were added into PHL to remove lignin by the formation of lignin-calcium complexes at the same treating pH of CH treatment.