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Table 2 Substrate composition and operational parameters of the full-scale processes included in the study

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

Substrate composition

(% of ingoing volume)

OLR

(ton VS/m3·day)

HRT

(days)

T

(°C)

Sampling points

FW1

Food waste (60%), slaughterhouse waste (25%), industrial waste (15%)

   

Substrate mixture

4.2

35

42

Digester

 

20

41

Post-digester

FW2

Food waste, vegetables, moulded food packages, slaughterhouse waste, food industry waste, pig manure, grease separator sludge1

   

Substrate mixture

3.0

25–35

37

Digester

 

5

37

Post-digester

FW3

Organic fraction of municipal household waste (100%)

   

Substrate mixture

3.8

27

38

Digester

 

7

36

Post-digester

FW-TD

Organic fraction of municipal household waste (98%), garden waste (2%)

   

Substrate mixture

4.7

27

55

Digester

AW1

Starch slurry (80%), cereals (18%), forage and corn silage (2%)

   

Starch slurry

   

Cereals

   

Corn silage

5.8

55

38

Digester

 

40

38

Post-digester

AW2

Crop silage (46%), corn silage (26%), sugar beets (16%), cereals (12%)

   

Substrate mixture

3.1

40

38

Digester

 

45

38

Post-digester

AWM

Pig manure (52%), grease sludge (16%), cow manure (12%), agricultural residues (12%), chicken manure (3%), deep litter (3%), slaughterhouse waste (2%)

   

Manure slurry + grease

   

Remaining fractions (see left)

3.4

55

38

Digester A

3.4

55

38

Digester B

WWTP1

Primary and activated sewage sludge (98%), grease separator sludge (2%)

   

Substrate mixture

2.5

20

38

Digester

WWTP2-A

WWTP2-B

Different substrate fractions for digester A and B, see below:

   

Primary sludge

   

Activated sewage sludge

   

Grease separator sludge

Primary (80%) and activated (20%) sewage sludge

1.5

17

37

Digester A

Primary (80%) and activated (12%) sewage sludge, grease separator sludge (8%)

1.8

15

37

Digester B

  1. 1 Volume fractions of the substrate were not provided by the biogas plant
  2. Several plants received a combination of substrates and were designated as FW/AW/WWTP relative to the main substrate fraction. FW food waste, FW-TD thermophilic dry digestion of food waste, AW plant-based agricultural waste, AWM agricultural waste + manure, WWTP wastewater treatment plant, OLR organic loading rate (ton VS/m3 day), HRT hydraulic retention time (days), T temperature (°C)
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Biotechnology for Biofuels and Bioproducts

ISSN: 2731-3654

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