Table 1. The market prices of the various chemicals and cost analysis of various chemicals used as magnesium sources.
| Chemicals | Marketprice | Costs for using differentmagnesium reagents($ kg–1 struvite) |
|||
|---|---|---|---|---|---|
| ($ kg−1) | Mg metal | MgOa | MgCl2b | MgSO4b | |
| Mg metal (99.9%) | 2.1 | 0.25 | — | — | — |
| MgO (95%) | 0.12 | — | 0.05 | — | — |
| MgCl2·6H2O | 0.12 | — | — | 0.12 | — |
| MgSO4·7H2O | 0.13 | — | — | — | 0.17 |
| NaOH | 0.46 | — | — | 0.11 | 0.11 |
| Total | — | 0.25 | 0.05 | 0.23 | 0.28 |
aDosing MgO at a Mg:P molar ratio of 2.5:1.
bDosing MgCl2/MgSO4 at a Mg:P molar ratio of 1.2:1, pH = 9.