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Table 6 Hydraulic retention time and residual gas potential of investigated AD plants

From: Digestion of bio-waste - GHG emissions and mitigation potential

Plant no. HRT in days a Relative residual gas potential in percent b Kind of fermentation c Mode of operation Separation of digestate
Minimum Maximum
1 8 11 15 Wet Multi-stage Yes
2 20 19 19 Wet Multi-stage Yes
3 17 - - Wet Single-stage No
4 25 - - Wet Multi-stage No
5 25 - - Dry Single-stage Yes
6 21 15 21 Dry Single-stage No
7 28 4 11 Dry Single-stage No
8 14 23 23 Dry Single-stage No
9 21 17 17 Dry Single-stage No
10 28 12 17 Batch Single-stage No
11 21 - - Batch Single-stage No
12 21 6 6 Batch Single-stage No
  1. aHydraulic retention time in days. bResidual gas potential of digestate according to the input material (fresh matter based). cWet = wet fermentation, dry = dry fermentation, batch = batch system (discontinuous).