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Table 4 Physico-chemical characteristics of the raw materials

From: From anaerobic to aerobic treatment: upcycling of digestate as a moisturizing agent for in-vessel composting process

Parameters

Units

FW

WS

Mc

D

pH

–

4.22

–

7.80

7.49

Conductivity (EC)

(mS/cm)

5.71

–

3.29

–

Moisture content (MC)

% of FM

77.40

6.50

53.30

96.7

Total solids (TS)

% of FM

22.60

93.50

46.70

3.30

Carbon (C)

% of FM

47.7

47.63

22.50

37.60

Nitrogen (N)

% of FM

2.60

0.61

1.60

2.90

C:N ratio

 

18.35

78.08

14.06

12.97

Phosphors (P)

% of TS

0.48

0.06

0.52

3.02

Potassium (K)

% of TS

0.91

1.74

1.12

4.16

Magnesium (Mg)

% of TS

0.09

0.25

1.22

2.33

Lead (Pb)

mg/kg TS

0.91

0.21

20.63

38.86

Copper (Cu)

mg/kg TS

6.82

1.78

23.30

165.64

Zinc (Zn)

mg/kg TS

16.33

16.6

143

8.08

Nickel (Ni)

mg/kg TS

0.95

5.78

9.34

0.32

Cadmium (Cd)

mg/kg TS

0.07

0.08

0.26

1.40

Arsenic (As)

mg/kg TS

0.57

0.07

3.10

0.02

Mercury (Hg)

mg/kg TS

 < 0.01

 < 0.01

0.02

0.05

  1. FM fresh matter, TS total solids