Biogas from beet pulp Energy production and Greenhouse Gas Reduction
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1 Biogas from beet pulp Energy production and Greenhouse Gas Reduction Sven G. Sommer, Thomas Astrup, Alessio Boldrin, Sander Bruun, Lars S. Jensen, Søren O. Petersen, Lone Abildgaard, Jin M. Triolo
2 Objective Develop model integrating value chain and biogas and environmental models. OBJECTIVE AND RESULT Result Decision support for biogas plant management and regional/national decision making.
3 Conceptual model of biogas production and greenhouse gas emission
4 Process Description Biogas production of sugar beet in Energy production and Greenhouse Gas Reduction Harvest in October o Beet top for animal feed o Beet root for bigas production Harvest Dry Cleaning in the field o Removing soil, sand, stones, etc. Cleaning Ensilage for 8 months o Whole beet root, fermentation o Covered Co digestion with cattle manure 1200m3, 6ton/day, 37 C, HRT 20days Cattle manure Ensilage Biogas production PVC roof (avoid dilution), until field application Post storage Applied in October or April Field
5 System Analysis Flow chart of Reference Scenario Sugar beet in field m 1 g x 1 top g x 1 root g x 1 soil g Top harvested m 2 g Unit 1. Harvest x 2 H2O g x 2 DM g Root harvested m 3 g x 3 root g x 3 soil g Soil m 4 g Unit 2. Cleaning Washed root m 5 g x 5 H2O g x 5 DM g x 5 ash g x 5 VS g Emission m 6 g Unit 3. Storage x 6 CO2 g x 6 CH4 g Gas m 13 g Fertilizer m 14 g x 13 CH4 g x 13 CO2 g x 13 NH3 g Unit 6. After storage x 14 H2O g x 14 DM g x 14 ash g x 14 VS g Digestate m 12 g x 12 H2O g x 12 DM g x 12 ash g x 12 VS g Biogas (emitted) m 11 g x 11 CH4 g x 11 CO2 g x 11 NH3 g x 10 H2O g Biogas (obtained) m 10 g Gas m 15 g m 15 N2O g m 15 CO2 g m 15 NH3 g Unit 5. Anaerobic digestion x 10 CH4 g x 10 CO2 g x 10 NH3 g x 10 H2O g Mixed substrate m 9 g x 9 H2O g x 9 DM g x 9 ash g x 9 VS g Silage m 7 g x 7 H2O g x 7 DM g x 7 VS g x 7 ash g Unit 4. Mixing Cattle slurry m8 g x 8 H2O g x 8 DM g x 8 VS g x 8 ash g Unit 7 Field 7 process units and sub systems with a total of 15 process streams
6 Process unit 1. Harvest 1 Sugar beet in field 1000g 706.9root g 37.5 soil g Top Removed 255.6g 2 Unit 1. Harvest H2O g 34.2 DM g Root harvested 744.4g 706.9root g 37.5soil g 3 Top for animal feed Root for biogas production Soil : 22% of beet s dry matter VSED Carbohydrate g Composition of root +soil (stream 3) Dry matter 192.0g VS 152.7g VSED 138.3g VSED Lipid 0.8g Total 744.4g Water 552.4g Ash 39.3g VSND 14.4g VSED Protein 7.8g
7 Process unit 2. Cleaning 4 Root harvested 744.4g 706.9root g 37.5 soil g Soil Removed 35.3g 5 Unit 2. Cleaning 4.5 H2O g 30.8 DM g Root cleaned 709.1g g H2O g DM 8.5 g ash g ash 6 Cleaned root AgroTech (Jørgen Pedersen) o o Soil residue 3.4% (dry cleaning) 2.1% (wet washing) VS Composition of cleaned root (Stream 6) VSD Lipid 0.8 Sucrose 101.2g VS 152.7g VSD 138.3g VSND 14.4g VSD Carbohydrate 129.8g VSD protein 7.8g Cellulose 6.5g Hemicelluloe 6.5g Pectins 15.6g
8 Process unit 3. Ensilage GHG emission o CH4 emission during first period ( 2 3 weeks) VS change o German study (Weißbach et al., 2009) :16% o Our study : 27.4(2.0%) BMP change o o Increasing of BMP per VS Slight decreasing of BMP per total wet weight TBMP of sucrose and ethanol TBMP per kg VS o German study (Weißbach et al., 2011) Beet type BMP (L/kg VS) BMP (L per kg fresh beet) Fresh beet SIlage o Our study Beet type BMP (L/kg VS) BMP (L per kg fresh beet) Fresh beet Silage Before Ensilage After ensilage CH 4 NL kg VS 1 CO 2 NL kg VS 1 g g Sucrose Ethanol
9 Process unit 3. Ensilage Mass balance flow chart of Ensilage 7 Root cleaned 709.1g g H2O g DM 8.5 g ash g VS Gas emission 23.5g 8 Unit 3. Ensilage 0.9 CH4 g (2.5% of BMP) 22.6 CO2 g Well fermented root silage Silage g g H2O g DM 8.5 g ash g VS 9 VS destruction : Great dependency of ensilage duration Fraction (%) Before ensilage Up to 6 months More than 6 months Sucrose Glucose Ethanol Hexoses Pentose Pectins Total Methane potential less affected due to alcoholisation of carbohydrate CO2 gas emission from fermentation (CO2 neutral) Lack of data for modelling AgroTech (Jørgen Pedersen)
10 Process unit 5. Biogas production 3% of total biogas VS destruction Beet Manure Input VS g Removed VS g Methane production rate and cumulative yield Remaining VS g VS destruction% Beet 92% of BMP removed Cattle manure 85% of BMP removed No linear relation between BMP and VS destruction Due to different digestibility
11 Overview of model ( 1000 g of beet g cattle manure) Basis unit (g) 80% (w.w) = X4 silage 20% (w.w) Unit 7 not completed
12 Scaling up model (Annual beet harvested ton per ha) Scaling o Changing values of all amounts or flow rates by proportional amount. o Compositions remain unchanged. Scale factor = Desired basis / Reference basis 123ton ha 1 yr g = = ( ton ha 1 yr 1 g 1 ) Basis of reference model (1000g beet) X (S.F)0.123 ( ton ha 1 yr 1 g 1 ) S.F multiplying flow rate of all the stream (not fraction) Basis of up scaled model = ( ton ha 1 yr 1 )
13 Energy production Basic Model (beet 1000g +2742g cattle manure ) Biogas CH4: 60.5g (84.7L) CO2: 125.1g(63.7L) Total: 185.6g(148.4L) Energy 3.4MJ Upscaled Model (beet harvested ton ha 1 yr 1 + cattle manure) Biogas CH4: 8.4.Mg (11780 m3) CO2: 17.4Mg (8855 m3) Total: 25.4Mg (20634m3) 43m3/ton Energy MJul 941MJ/ton Electricity 0.95Kwh Electricity 131Mwh (261Kwh/ton)
14 GHG emission using biogas technology ( Reference Model ) With Biogas production (Beet + manure) SGS1 SGS CH4 : 4.177g (0.88g ensilage, 1.87g biogas plant emission, 1.42g after storage) CO2 : 7.289g GHG as CO2 eq. : g Without biogas production (manure) CH4 : 4.183g, CO2 : 7.3g, GHG as CO2 eq. : 111.9g No GHG reduction, may be due to : GHG emission from beet silage included CH4 emission from ensilage Emission from a biogas plant
15 Slide 14 SGS1 SGS2 Include (Beet and slurry) Sven G. Sommer; include (Slurry) Sven G. Sommer;
16 Improvement of current method to determine GHG emission during storage of digestate IPCC (2006) methodology CH4 [kg] = VS [kg] * BMP[m 3 CH4 per kg VS ]*MCF*0.67 [kg CH4 per m 3 CH4] (IPCC choose to use BMP of fresh slurry from animal house) 1.07 CH4 [kg]/ [kg] = ((0.27VS [kg] *0.224[m 3 CH4 per kg VS](BMP of fresh slurry) * 0.67[kg CH4 per m 3 CH4] * 0.1(MCF))/2.7kg Method used for our study Afterbiogas production the BMP of the digestate is quite lower than BMP of fresh slurry. BMP of digestate is applied. Reduced BMP must be applied! 0.25 CH4 [kg]/ [kg] = ((0.27VS [kg] *0.051[m 3 CH4 per kg VS](BMP of fresh slurry) * 0.67[kg CH4 per m 3 CH4] * 0.1(MCF))/2.7kg Risk of over estimation of GHG emission using IPCC current protocol in biogas scenario Our experiments on BMP of digestate from full scale biogas plant (7samples) ( (±0.19) m 3 CH4 per kg VS)
17 Conclusion and Perspective New knowledge need BMP of biomass for digester not linear related to VS End user need Outcome of the decision support tool? Information for the model in general available by the end user? Demand to the analytical tool Which characteristics Cost (investment & running cost)
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