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Table 1 Process performance parameters of digesters and post-digesters at full-scale biogas plants at the time of sampling

From: Identifying targets for increased biogas production through chemical and organic matter characterization of digestate from full-scale biogas plants: what remains and why?

Plant Sample point TS (%) VS (% of TS) VS red. (%) pH NH4+-N (g/kg) NH3-N (g/kg) VFA (mg/L)
FW1 D 5.3 73.6 70 7.8 3.4 0.34 80
PD 4.3 71.5 77 7.8 3.6 0.35 40
FW2 D 3.9 66.7 48 7.9 3.6 0.31 1360
PD 3.8 65.5 50 7.9 3.8 0.35 190
FW3 D 4.1 69.6 75 7.5 2.4 0.10 40
PD 3.8 67.9 77 7.7 2.5 0.13 20
FW-TD D 11.6 66.6 65 7.8 3.8 0.74 8450
AW1 D 10 88.2 67 7.6 2.4 0.12 150
PD 7.2 86.0 78 7.5 2.3 0.08 60
AW2 D 8.6 81.8 66 7.3 3.3 0.09 320
PD 6.3 77.3 77 7.8 2.4 0.20 2
AWM-A
AWM-B
D 7.3 74.1 62 7.9 2.0 0.18 370
D 7.4 74.2 62 7.8 3.4 0.26 420
WWTP1 D 3.2 66.5 55 7.9 1.4 0.15 20
WWTP2-A
WWTP2-B
D 1.6 64.5 63 7.2 0.8 0.02 20
D 1.7 65.7 61 7.4 0.9 0.02 40
  1. FW food waste, TD thermophilic dry digestion, AW plant-based agricultural waste, AWM agricultural waste + manure, WWTP wastewater treatment plant, TS total solids, VS volatile solids, VS red VS reduction, VFA total concentration of volatile fatty acids, D main digester, PD post-digester