The role of chloramine in media regeneration was also evaluated based upon the amount of free chlorine that was required to fully regenerate the media in an offline manner following backwash. Table 3 presents a summary of the free chlorine regeneration data.
Comparison of total Mn removal and offline chlorine regeneration needs for contactor media
| Media type . | Total Mn removed (milliequivalents) . | Total free chlorine regeneration (milliequivalents) . | Media oxidant demand met by free chlorine (%) . |
|---|---|---|---|
| 1.6 mm ES ceramic | 759 | 164 | 21.6 |
| 2.0 mm ES anthracite coal | 682 | 134 | 19.6 |
| All media | 1,441 | 298 | 20.7 |
| Media type . | Total Mn removed (milliequivalents) . | Total free chlorine regeneration (milliequivalents) . | Media oxidant demand met by free chlorine (%) . |
|---|---|---|---|
| 1.6 mm ES ceramic | 759 | 164 | 21.6 |
| 2.0 mm ES anthracite coal | 682 | 134 | 19.6 |
| All media | 1,441 | 298 | 20.7 |