Table 3.
Removal efficiency of COD corresponding to operation parameters.
| pH | 2 | 2.5 | 3 | 3.5 | 4 | 4.5 |
| COD removal efficiency (%) | 46.31 | 49.61 | 54.62 | 44.01 | 41.82 | 36.58 |
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| Reaction time (min) | 30 | 45 | 60 | 90 | 120 | |
| COD removal efficiency (%) | 49.83 | 52.84 | 55.01 | 60.7 | 62.24 | |
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| Settling time (min) | 30 | 45 | 60 | 90 | 120 | |
| COD removal efficiency (%) | 56.06 | 60.08 | 61.19 | 61.37 | 61.74 | |
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| Ratio H2O2/Fe2+ | 1 : 1 | 2 : 1 | 3 : 1 | 4 : 1 | 5 : 1 | |
| COD removal efficiency (%) | 61.01 | 64.35 | 74.27 | 88.08 | 92.18 | |
Note. (i) After each orientation experiment, an optimal parameter was selected applying for the next experiments. (ii) Ratio H2O2/Fe2+ 1 : 1 = 1.5 : 1.5 (g/L).