Table 3 Elemental composition of sewage sludge hydrochars and activated carbons

From: Sewage sludge hydrochar characterization and valorization via hydrothermal processing for 3D printing

Composition

H250

H300

H320

AC250

AC300

AC320

C

56.92

67.7

72.14

53.52

55.32

60.47

N

4.18

4.3

3.61

2.79

1.45

2.37

O

29.26

21.74

18.85

30.11

30.45

26.84

Al

1.47

0.42

0.58

2.54

2.5

2.03

Si

2.49

1.54

2.16

3.63

3.05

2.3

P

2.19

1.91

1.15

3.64

3.27

2.67

Ca

1.3

0.98

0.66

1.84

2.09

1.73

Fe

2.21

1.42

0.85

1.92

1.88

1.59

  1. In general, relative carbon content decreased with thermal activation while relative content of various heteroatoms increased, the opposite effect of what is usually observed with thermal activation of biomass-based hydrochars.
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