Table 7 Environmental impact assessment of chromium recovery from leather tanning residues using various impact categories associated with the ReCiPe method (FU = 1 kg of chromium recovered).
Impact category | Unit | Total | Sodium hydroxide | Tap water | Energy production from biogas |
|---|---|---|---|---|---|
Climate change Human Health | DALY | 2.43E-06 | 2.35E-06 | 2.11E-08 | 5.37E-08 |
Ozone depletion | DALY | 3.16E-09 | 3.15E-09 | 2.88E-12 | 1.95E-12 |
Human toxicity | DALY | 5.95E-07 | 5.76E-07 | 7.81E-09 | 1.06E-08 |
Photochemical oxidant formation | DALY | 2.35E-10 | 2.14E-10 | 1.95E-12 | 1.93E-11 |
Particulate matter formation | DALY | 1.25E-06 | 1.18E-06 | 9.01E-09 | 5.59E-08 |
Ionizing radiation | DALY | 3.79E-09 | 3.68E-09 | 9.06E-11 | 2.18E-11 |
Climate change Ecosystems | species.yr | 1.37E-08 | 1.33E-08 | 1.19E-10 | 3.04E-10 |
Terrestrial acidification | species.yr | 5.44E-11 | 4.93E-11 | 3.83E-13 | 4.73E-12 |
Freshwater eutrophication | species.yr | 3.73E-11 | 3.65E-11 | 4.97E-13 | 3.60E-13 |
Terrestrial ecotoxicity | species.yr | 2.86E-11 | 2.80E-11 | 2.96E-13 | 3.18E-13 |
Freshwater ecotoxicity | species.yr | 5.32E-11 | 5.15E-11 | 3.75E-13 | 1.33E-12 |
Marine ecotoxicity | species.yr | 9.89E-12 | 9.58E-12 | 7.18E-14 | 2.44E-13 |
Agricultural land occupation | species.yr | 1.05E-09 | 1.03E-09 | 1.09E-11 | 1.11E-11 |
Urban land occupation | species.yr | 5.63E-10 | 5.54E-10 | 4.29E-12 | 4.63E-12 |
Natural land transformation | species.yr | 4.94E-10 | 4.84E-10 | 3.27E-12 | 5.91E-12 |
Metal depletion | $ | 1.03E-02 | 9.49E-03 | 1.94E-04 | 5.94E-04 |
Fossil depletion | $ | 7.39E-02 | 7.27E-02 | 6.71E-04 | 5.42E-04 |
