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Table 2 Characterization of feedstocks and the inoculum (Mean ± SD)

From: Effect of carbon-rich-waste addition as co-substrate on the performance and stability of anaerobic digestion of abattoir wastewater without agitation

Parameter

Liquid feedstock before and after mixing

Raw solid feedstock

R1 (100%AWW)

R2 (75%AWW:25%FVW)

R3 (50%AWW:50%FVW)

R4 (25%AWW:75%FVW)

R5 (100%FVW)

Inoculum

Parameter

FVSW

TS (%)

.86 ± .04

1.01 ± .08

1.44 ± .17

1.71 ± .05

1.87 ± .18

1.86 ± .048

TS (%)

91.13 ± .23

VS (%)

78.38 ± 1.13

70.68 ± 1.52

68.15 ± .91

62.26 ± 1.63

59.25 ± 3.15

69.39 ± 1.07

VS (%)

80.40 ± .08

FS (%)

21.62 ± 1.13

29.32 ± 1.52

31.85 ± .91

37.74 ± 1.63

40.75 ± 3.15

30.61 ± 1.07

Ash (%)

19.60 ± .08

pH

6.33 ± .00

6.50 ± .00

6.61 ± .00

6.85 ± .00

6.39 ± .00

7.74 ± .00

MC (%)

8.87 ± .23

ORP (mv)

41.00 ± .00

32.00 ± .00

25.00 ± .00

11.00 ± .00

37.00 ± .00

−47.00 ± .00

ASL (%)

1.75 ± .22

EC (mS)

8.30 ± .00

8.75 ± .00

8.17 ± .00

7.61 ± .00

7.28 ± .00

4.89 ± .00

AIL (g/l)

.02 ± .00

TN (mg/l)

912.50 ± 17.68

825.00 ± .00

662.50 ± 17.68

625  ± 35.36

612.50 ± 17.68

Fat (%)

1.65 ± .29

TP (mg/l)

125.25 ± .35

310.00 ± .00

391.67 ± 11.79

446.67 ± 70.71

651.67 ± 2.35

TC (ppm)

863.99 ± 44.89

COD (mg/l)

13,510.00 ± .00

14,530.00 ± .00

14,950.00 ± .00

15,160  ± .00

17,800.00 ± .00

Protein (%)

13.62 ± .76

C:N ratio (COD/TN)

14.81 ± .28

17.61 ± .00

22.58 ± .60

24.30 ± 1.38

29.08 ± .84

Extractives (%)

12.20 ± 3.00

FOG (g/l)*

1.825

Hemi-cellulose (%)

0.64 ± .00

C (%)

32.09 ± .39

H (%)

2.18 ± .12

N (%)

1.09 ± .05

       

C:N ratio

29.44 ± .64

  1. *Mulu and Ayenew 2015