Table 5 Effect of the pyrolysis temperature on contamination factor (Cf), potential ecological risk coefficient (Er) and potential ecological risk Index (PERI) of the sewage sludge (SS) and sewage sludge biochar produced at 350 (SSB350), 450 (SSB450) and 600 (SSB600).
Sample | Cf | Er | PERI | ||||||
|---|---|---|---|---|---|---|---|---|---|
Cd | Cu | Zn | Pb | Cd | Cu | Zn | Pb | ||
SS | 1.39 ± 0,07 | 0.03 ± 0.01 | 1.01 ± 0.10 | 0.00 ± 0.00 | 41.65 ± 2.01 | 0.15 ± 0.01 | 1.01 ± 0.10 | 0.00 ± 0.00 | 42.81 ± 2.08 |
SSB350 | 1.22 ± 0.11 | 0.00 ± 0.00 | 0.21 ± 0.01 | 0.00 ± 0.00 | 36.57 ± 3.17 | 0.02 ± 0.00 | 0.21 ± 0.01 | 0.00 ± 0.00 | 36.80 ± 3.16 |
SSB450 | 3.64 ± 0.53 | 0.02 ± 0.00 | 0.12 ± 0.01 | 0.00 ± 0.00 | 109.28 ± 15.89 | 0.10 ± 0.01 | 0.12 ± 0.01 | 0.00 ± 0.00 | 109.50 ± 15.89 |
SSB600 | 0.00 ± 0.00 | 0.02 ± 0.00 | 0.10 ± 0.01 | 0.06 ± 0.01 | 0.00 ± 0.00 | 0.10 ± 0.00 | 0.10 ± 0.01 | 0.29 ± 0.04 | 0.51 ± 0.04 |
