Table 3.
Comparison of different advanced oxidation approaches in terms of cost of treatment.
| Type of effluent | Treatment scheme | Total Energy required for the treatment (kWh) | Total electricity cost, Rs/L (USD/L) | Chemical cost, Rs/L (USD/L) | Treatment cost, Rs/L (USD/L) |
|---|---|---|---|---|---|
| Effluent-I | Only US (CaO:1g/L) | 2.04 | 17.875 (0.238)* | 0.005 (6.67 × 10−5) | 17.880) (0.238) |
| Only Fenton (H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L) | 0.54 | 4.756 (0.063) | 1.448 (0.019) | 6.204 (0.083) | |
| Only ozone (O3: 1 g/h) | 1.30 | 11.429 (0.152) | 0.000 (0.000) | 11.429 (0.152) | |
| US + Fenton + Lime (H2O2:15 g/L, H2O2/Fe2+:3, CaO:1g/L) | 0.47 | 4.096 (0.055) | 1.242 (0.017) | 5.338 (0.071) | |
| US + Fenton + Lime (H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L) | 0.34 | 2.961 (0.039) | 1.448 (0.019) | 4.408 (0.059) | |
| US + Fenton + Lime (H2O2:20 g/L, H2O2/Fe2+:3, CaO:1g/L) | 0.33 | 2.906 (0.039) | 1.654 (0.022) | 4.560 (0.061) | |
| US + Fenton + Lime (H2O2:22.5 g/L, H2O2/Fe2+:3, CaO:1g/L) | 0.33 | 2.888 (0.039) | 1.860 (0.025) | 4.748 (0.063) | |
| US + Fenton + Lime (H2O2:30 g/L, H2O2/Fe2+:3, CaO:1g/L) | 0.37 | 3.215 (0.043) | 2.478 (0.033) | 5.693 (0.076) | |
| US + Fenton + Lime (H2O2:17.5 g/L, H2O2/Fe2+:1, CaO:1g/L) | 0.36 | 3.140 (0.042) | 1.448 (0.019) | 4.588 (0.061) | |
| US + Fenton + Lime (H2O2:17.5 g/L, H2O2/Fe2+:2, CaO:1g/L) | 0.35 | 3.087 (0.041) | 1.448 (0.019) | 4.535 (0.060) | |
| US + Fenton + Lime (H2O2:17.5 g/L, H2O2/Fe2+:4, CaO:1g/L) | 0.35 | 3.103 (0.041) | 1.448 (0.019) | 4.551 (0.061) | |
| US + Ozone (O3: 0.5 g/h) | 4.74 | 41.598 (0.555) | 0.000 (0.000) | 41.598 (0.555) | |
| US + Ozone (O3: 1 g/h) | 3.90 | 34.219 (0.456) | 0.000 (0.000) | 34.219 (0.456) | |
| US + Ozone (O3: 2 g/h) | 4.00 | 35.086 (0.468) | 0.000 (0.000) | 35.086 (0.468) | |
| US + Ozone (O3: 3 g/h) | 4.05 | 35.522 (0.474) | 0.000 (0.000) | 35.522 (0.474) | |
| US + Fenton + O3 (H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L, O3:1g/h) | 1.04 | 9.134 (0.122) | 1.448 (0.019) | 10.582 (0.141) | |
| Effluent-II | Only US (CaO:1g/L) | 3.08 | 27.055 (0.361) | 0.005 (6.67 × 10−5) | 27.060 (0.361) |
| US + Fenton + Lime (H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L) | 0.92 | 8.041 (0.107) | 1.448 (0.019) | 9.489 (0.127) | |
| HC + Fenton + Lime (H2O2:17.5 g/L, H2O2/Fe2+:3, CaO:1g/L) | 0.05 | 0.481 (0.006) | 1.448 (0.019) | 1.929 (0.026) |
*Numbers in brackets give Cost in US Dollar using the conversion rate of 75 Rs = 1 USD.