Table 2 Physicochemical properties of raw cow dung, slurry and active sludges.

From: Microbiome signature and diversity regulates the level of energy production under anaerobic condition

Parameters

Cow dung (CD; Day-0)

Slurry (CD + seed sludge; Day-0)

Active sludge (AS; Day-35, highest CH4 concentration)

Moisture (%)

23.32

86.16

90.03

Organic carbon (%)

34.39

36.83

15.48

Total nitrogen (%)

1.82

1.96

1.22

C: N

18.9:1

18.8:1

12.7:1

Phosphorus (%)

0.249

0.461

0.070

Sulphur (%)

0.522

0.579

0.038

Zinc (mg/kg)

16.24

17.56

15.58

Copper (mg/kg)

2.88

3.59

2.13

Chromium (mg/kg)

11.97

11.33

0.23

Cadmium (mg/kg)

BDL

BDL

0.04

Lead (mg/kg)

3.44

3.26

1.06

Nickel (mg/kg)

3.28

6.70

0.34

  1. CD: raw semi-solid cow dung which was mixed with water; Slurry: mixture of CD and seed sludge from previous biogas plant; AS: slurry from the AD when the gas production rate was the highest (i.e. 74.1% CH4 concentration); and BDL: below detection limit.
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