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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).