Table 2 Physical–chemical characteristics of sewage sludge (SS) and sewage sludge biochars (SSB) produced at 350 (SSB350), 450 (SSB450) and 600 (SSB600).

From: Induced changes of pyrolysis temperature on the physicochemical traits of sewage sludge and on the potential ecological risks

Biochar characteristic

SS

SSB350°

SSB450°

SSB600°

pHH2O (1:10)

4.5 ± 0.1

4.8 ± 0.0

5.7 ± 0.1

5.8 ± 0.0

pHKCl (1:10)

4.2 ± 0.1

4.4 ± 0.0

5.3 ± 0.0

5.4 ± 0.0

EC dSm−1

4.0 ± 0.0

2.2 ± 0.0

1.6 ± 0.0

1.5 ± 0.3

CEC cmolc kg−1

6.0 ± 0.1

6.3 ± 0.1

6.4 ± 0.0

6.0 ± 0.1

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