brief description of two-phase systems case study bioferm
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Two phase anaerobic digestion
Bernd Linke Leibniz-Institute for Agricultural Engineering www.atb-potsdam.de
Brief description of two-phase systems
Case study BioFerm/ Vissmann Group
Batch operation experiments
Continuously operation experiments
Advantages of Two-phase systems
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Brief description of two phase systems
Anaerobic Digestion (AD) for structural biomass, Percolation of biomass (solid phase) by means of a liquid phase with low parasitic energy consumption due to the lack of moving parts
Process A (batch): Mixing of digested material (inoculum) with feed, percolation for 20 – 40 days, Process B (batch): Percolation of feed without inoculum for 20 – 40 days, degradation of VFA in a methane reactor Process C (continuously): Percolation in a floating bed digester, (Biomass lift up), degradation of VFA in a methane reactor at high OLR
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Percolate
Percolate tank
Biogas
Gate for filling and withdraw
Insulated Digester wall
Pump pit
Biomass
Sloped floor with water heating
Two phase, one step, Bioferm/Vissmann Group Biomass with inoculum (Process A)
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Two phase, one step, Bekon Technology Biomass with inoculum (Process A)
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Two phase, one step, Loock Biogas systems Biomass with inoculum (Process A)
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Two phase, two steps, Gicon Technology Biomass without inoculum (Process B)
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Case study BioFerm/ Vissmann Group (A)
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Parameter Data Farm data 5 ha cropland, 125 ha grassland, 70 sheep, 12 cows
Substrate feed
1034 t/a, 52% grass silage, 31% fresh grass, 14% cattle manure, 3% hay, % fresh mass (FM)
TS = 37% FM, VS = 33% FM, NH4-N = 1kgt-1, Ntot = 9.9 kgt-1
Digester 2 digester each 408 m3, 1 percolation tank 12 m3
Digester operation
Residence time 18 days, proportion of digestate in the mixture 39% FM, T = 48°C, pH = 7.6, OLR = 1.9 kgVSm-3d-1. Ac = 1.7 kgt-1
Case study BioFerm/ Vissmann Group (A)
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Parameter Data Digester performance
VS-biogas/methane yield y = 309/155 m3t-1 (54.3% CH4) biogas/methane productivity R = 0.57/0.29 m3m-3d-1
Digestate quality
TS = 23.6% FM, VS =1 5.7% FM, NH4-N = 1.2 kgt-1, Ntot = 7.2 kgt-1
Residual methane yield (20°C, 60 days) 5.4 m3t-1 FM
Biogas utilisation
CHP (46 kWel.); 364 KWhel/day, current sale in power grid, 1368 KWhth/week heat utilisation, replacement of fossil fuels
Case study BioFerm/ Vissmann Group (A)
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Festbettreaktor
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Solid State Digester
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FA
CHP Anaerobic Filter
Solid digestate
B
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VFA
Two phase, two steps, Experimental plant
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Two phase, two steps, Lab-scale
peristaltic pumps Fixed film digester (FFD 50L)
Solid state digester (SSD 50L)
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Methane yield as function of inoculum proportion (whole crop silage)
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Continuously fed 540 L Floating Bed Digester (FBD)
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1
2
3
a
c
b
d
e
a substrate input b percolation liquid c solid digestate d liquid digestate e biogas
1 Floating Bed Digester FBD 2 peristaltic pump 3 wet gas meter
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Continuously fed Floating Bed Digester (FBD, 55L) coupled with 40 L Anaerobic Filter (AF 40L)
1
2 4
3
5
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a
c
b
d
e f
g a substrate input b percolation liquid c digested material d influent AF e effluent AF f biogas from FBD g biogas from AF
1 Floating Bed Digester FBD 2 Anaerobic Filter AF 3 peristaltic pump FBD 4 peristaltic pump AF 5 wet gas meter FBD 6 wet gas meter AF
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Analysis of Feed-Gras Silage
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Feed pH TS VS Raw Fibre Sugar Ntot
- % FM % TS % TS % TS % FM
Grassilage 1a* 5.1 55.6 92.4 35.2 2.0 1.25
Grassilage 1b* 5.2 53.0 93.7 32.2 9.8 1.12
Gassilage 2** 4.2 36.0 90.9 30.0 3.1 1.08
* Feed used for FBD (540 L) trials * Feed used for FBD (55L) with AF (40L) trials
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Results from 540 L Floating Bed Digester (FBD)
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Results from Floating Bed Digester (FBD, 55L) coupled with 40 L Anaerobic Filter (AF 40L)
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Treatment of process liquor for VFA degradation
High performance digesters with biomass retention for degradation of VFA and soluble organic compounds inhibition at low pH-value
Anaerobic filter digester Fluidized bed digester UASB digester
Removal of Ammonia inhibition at high pH-value
Desorption (stripping) of NH3 by means of air, steam at low pressure Precipitation of NH4 by adding of MgCl2 and H3PO4 MgNH4PO4 (Struvit)
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Draft of a FBD
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Thank you
for your attention!