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Table 5 Performance of acidogenic and methanogenic reactors (MR) with different mixing ratios

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

Parameters Reactors with different mixing ratios
HR1 HR2 HR3 HR4 HR5
Acidogenic reactor (HR)
 pH 7.47±.09 6.82±.47 6.41 ± .25 6.32 ± .16 6.00 ± .3
 ORP (mv) − 24.88 ± 4.85 11.00 ± 26.38 34.13 ± 14.55 39.00 ± 9.06 57.13 ± 16.88
 TS (%) .73 ± .41 .96 ± .11 1.35 ± .44 2.13 ± 1.91 1.53 ± .23
 VS (%) 70.71 ± 3.58 64.14 ± 2.47 64.50 ± 14.47 57.25 ± 1.48 48.75 ± 10.29
 NH3 (mg/l) 1726.25 ± 139.99 1432.50 ± 185.76 1273.75 ± 316.45 866.25 ± 301.99 488.75 ± 155.97
 TALK (g CaCO3/l) 7.95 ± 2.47 6.82 ± 2.36 6.45 ± 1.77 5.90 ± 1.37 5.39 ± .95
 TCOD (mg/l) 9986.25 ± 1071.63 10,222.5 ± 912.07 10,175.0 ± 1059.3 10,622.5 ± 1103.28 10,791.25 ± 1033.81
 VFA (g/L) 38.71 ± 9.88 44.45 ± 10.72 44.53 ± 9.31 43.55 ± 7.98 36.94 ± 12.43
  MR1 MR2 MR3 MR4 MR5
Methanogenic reactor (MR)   
 pH 8.02 ± .076 8.07 ± .06 7.98 ± .08 8.06 ± .11 7.99 ± .07
 ORP (mv) − 54.75 ± 4.062 − 57.13 ± 3.09 − 52.75 ± 4.80 − 56.88 ± 6.06 − 53.63 ± 3.89
 TS (%) .54 ± .17 .63 ± .08 1.12 ± 1.20 .78 ± .14 1.13 ± .16
 VS (%) 70.27 ± 12.51 53.21 ± 3.39 36.97 ± 13.65 34.92 ± 3.02 39.13 ± 11.26
 NH3 (mg/l) 1492.50 ± 175.15 1212.50 ± 131.99 901.25 ± 108.69 691.25 ± 129.88 402.50 ± 62.51
 TALK (g CaCO3/l) 8.61 ± 2.68 8.77 ± 2.47 8.57 ± 2.53 8.34 ± 2.764 7.94 ± 2.65
 CH4 (%) 56.64 ± 1.89 47.16 ± 3.12 59.95 ± 3.66 28.63 ± 3.76 31.81 ± 2.87
 Biogas (ml/day) 243.75 ± 35.03 342.50 ± 65.63 590.00 ± 49.86 331.25 ± 37.20 188.75 ± 45.18
 CH4 (ml/day) 138.34 ± 22.41 162.98 ± 39.46 353.86 ± 38.46 94.16 ± 11.94 59.16 ± 10.94
 TCOD (mg/l) 7212.50 ± 2028.19 6067.50 ± 2145.61 5730.00 ± 3070.31 3867.50 ± 2625.05 4227.50 ± 3373.28
 TVFA (g CH3COOH/l) 10.95 ± 6.41 11.47 ± 3.27 5.80 ± 1.37 4.91 ± 0.43 4.16 ± 0.96
 VS removed (%) 44.7 53.37 70.23 63.84 59.84
 SMY (mlCH4/g VS add) 20.30 22.84 36.53 9.00 5.37
 BY (ml Biogas/g VS add) 35.77 48.00 60.90 31.65 17.13