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Table 3

Biogas and digestate properties of the digesters during ACoD II

R1R2R3R4R5R6
Biogas yield (LB KgVS−1) 
 Average 419 ± 59 427 ± 56 443 ± 85 490 ± 105 435 ± 77 403 ± 106 
 Q25 375.7 382.2 372.3 403.9 392.0 389.2 
 Q50* 415.7 445.5 447.7 447.6 439.8 414.7 
 Q75 442.1 495.8 468.3 490.7 495.6 509.7 
Biogas productivity (LB LR−1 d−1) 
 Average 0.85 ± 0.15 0.86 ± 0.17 0.91 ± 0.20 1.01 ± 0.24 0.89 ± 0.18 0.85 ± 0.22 
 Q25 0.755 0.789 0.786 0.891 0.759 0.746 
 Q50* 0.842 0.888 0.946 0.992 0.908 0.841 
 Q75 0.901 0.958 1.06 1.16 1.004 1.008 
 CH4 content (%) 64 ± 12 77 ± 6 63 ± 6 70 ± 1 64 ± 12 71 ± 22 
Digestate 
 TCOD (mg L−1) 55,240 ± 4,204 45,850 ± 3,270 48,460 ± 3,991 47,230 ± 2,448 43,920 ± 2,191 45,780 ± 926 
 SCOD (mg L−1) 3,202 ± 492 2,968 ± 239 3,494 ± 692 3,966 ± 1,663 2,858 ± 976 4,156 ± 525 
 TAN (mg L−1) 2,526 ± 231 2,559 ± 125 2,609 ± 204 2,822 ± 119 3,218 ± 230 3,603 ± 295 
 VFA (mgAC L−1) 778 ± 322 610 ± 106 817 ± 279 801 ± 113 866 ± 99 2,346 ± 819 
 pH 7.8 ± 0.2 7.8 ± 0.1 7.8 ± 0.1 7.7 ± 0.1 7.7 ± 0.1 7.7 ± 0.1 
 TAC (mg L−1) 7,467 ± 353 7,720 ± 387 8,080 ± 493 8,867 ± 846 10,293 ± 661 11,427 ± 886 
 NTK (mg L−1) 4,035 n.d n.d 4,430 n.d 8,300 
 P total (mg L−1) 618 n.d n.d 458 n.d 678 
R1R2R3R4R5R6
Biogas yield (LB KgVS−1) 
 Average 419 ± 59 427 ± 56 443 ± 85 490 ± 105 435 ± 77 403 ± 106 
 Q25 375.7 382.2 372.3 403.9 392.0 389.2 
 Q50* 415.7 445.5 447.7 447.6 439.8 414.7 
 Q75 442.1 495.8 468.3 490.7 495.6 509.7 
Biogas productivity (LB LR−1 d−1) 
 Average 0.85 ± 0.15 0.86 ± 0.17 0.91 ± 0.20 1.01 ± 0.24 0.89 ± 0.18 0.85 ± 0.22 
 Q25 0.755 0.789 0.786 0.891 0.759 0.746 
 Q50* 0.842 0.888 0.946 0.992 0.908 0.841 
 Q75 0.901 0.958 1.06 1.16 1.004 1.008 
 CH4 content (%) 64 ± 12 77 ± 6 63 ± 6 70 ± 1 64 ± 12 71 ± 22 
Digestate 
 TCOD (mg L−1) 55,240 ± 4,204 45,850 ± 3,270 48,460 ± 3,991 47,230 ± 2,448 43,920 ± 2,191 45,780 ± 926 
 SCOD (mg L−1) 3,202 ± 492 2,968 ± 239 3,494 ± 692 3,966 ± 1,663 2,858 ± 976 4,156 ± 525 
 TAN (mg L−1) 2,526 ± 231 2,559 ± 125 2,609 ± 204 2,822 ± 119 3,218 ± 230 3,603 ± 295 
 VFA (mgAC L−1) 778 ± 322 610 ± 106 817 ± 279 801 ± 113 866 ± 99 2,346 ± 819 
 pH 7.8 ± 0.2 7.8 ± 0.1 7.8 ± 0.1 7.7 ± 0.1 7.7 ± 0.1 7.7 ± 0.1 
 TAC (mg L−1) 7,467 ± 353 7,720 ± 387 8,080 ± 493 8,867 ± 846 10,293 ± 661 11,427 ± 886 
 NTK (mg L−1) 4,035 n.d n.d 4,430 n.d 8,300 
 P total (mg L−1) 618 n.d n.d 458 n.d 678 

n.d, not determined.

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