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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