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Biogas production from sugar beet silage Jin Mi Triolo University of Southern Denmark.

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Presentation on theme: "Biogas production from sugar beet silage Jin Mi Triolo University of Southern Denmark."— Presentation transcript:

1 Biogas production from sugar beet silage Jin Mi Triolo University of Southern Denmark

2 Why sugar beet silage? Dedicate energy crop for biogas production: prohibited until 2011 New regulation since 2012: up to 25% of dedicate energy crop allowed as co- feedstock (at least 75% must be animal manure) Sugar beet : Highest dry matter yield per. ha : Easily degradable, high methane potential : Ensilaging produce alcohols and organic acids (quick biogas production)

3 Influence of ensilage

4 Ensilage effect of beets pulps DM DM loss VS VS lossVS Total VFA Total Alcohol pH BMP g kg-1% % (%)% of VS NL CH4 kg VS-1) CH4 NL kg -1 Fresh silage194,6 153,4 78,80,460,004,5342,152,5 Silage 1146,724,6109,828,4174,98,484,603,6490,353,8 Silage 2157,619,0116,823,8474,18,634,503,6499,858,4 Silage 3163,516,0121,121,0574,16,014,663,6456,355,3 Silage 4173,710,8114,225,5265,86,784,953,6478,054,6 Silage 5135,530,4106,030,9078,28,774,843,7493,952,3

5 Further Study 1 Grøngas A/S (Hjørring) Long term monitering of beet ensilage (Harvested in Nov Ensilaging until December 2014) (6 silos with different scenarios) o GHG emission o Biogas potentials o Optimising high rate biogas production o Organic composition

6 Further study 2 1 Spring barley straw 2 Spring barley straw in the swath, 21/10 3 Spring barley straw + aftermath, fresh 4 Spring barley straw + aftermath, ensiled 5 Grass seed straw, fresh 6 Grass seed straw, silage 7 Grass seed straw, silage grass juice 8 Grass seed aftermath, fresh 9 Grass seed after forage ensiled 10 Maise silage

7 Further study 3 Beet top Straw with 30% water Roerod knust Beet top and straw with different mixing ratios Beet top + Straw0100 Beet top + Straw7525 Beet top + Straw8020 Beet top + Straw8515 Beet top + Straw9010 Beet top + Straw1000 Grøngas A/S (Hjørring)

8 Examples of concept model work Biogas production of sugar beet in Energy production and Greenhouse Gas Reduction Field Post -storage Biogas production Ensilage Cleaning Harvest Harvest in October o Beet top for animal feed o Beet root for bigas production Dry Cleaning in the field o Removing soil, sand, stones, etc. 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 PVC roof (avoid dilution), until field application Applied in October or April

9 Unit 1. Harvest Sugar beet in field Top harvested m 2 g x 3 root g x 2 DM g Root harvested m 3 g x 2 H 2 O g x 3 soil g Unit 2. Cleaning Washed root m 5 g Soil m 4 g x 8 H 2 O g x 8 DM g x 8 VS g x 8 ash g Unit 3. Storage Unit 4. Mixing Emission m 6 g x 6 CO 2 g x 6 CH 4 g Silage m 7 g x 7 H 2 O g x 7 DM g x 7 VS g x 7 ash g Unit 7 Field x 1 root g x 1 soil g x 1 top g m1gm1g Cattle slurry m 8 g Unit 6. After-storage Gas m 13 g x 13 CO2 g x 13 CH4 g x 13 NH3 g Unit 5. Anaerobic digestion Biogas (obtained) m 10 g x 10 CO 2 g x 10 CH 4 g x 10 NH 3 g Digestate m 12 g x 12 H2O g x 12 ash g x 12 VS g x 12 DM g x 9 H2O g x 9 ash g x 9 VS g x 9 DM g Mixed substrate m 9 g Biogas (emitted) m 11 g x 11 CO2 g x 11 CH4 g x 11 NH3 g Fertilizer m 14 g x 14 H2O g x 14 ash g x 14 VS g x 14 DM g Gas m 15 g m 15 CO2 g m 15 N2O g m 15 NH3 g x 10 H 2 O g x 5 H2O g x 5 ash g x 5 VS g x 5 DM g Flow chart of Reference Scenario 7 process units and sub-systems with a total of 15 process streams Model 1 (Basis unit :1000g beet) Model 2 (Basis unit : ton/ha)

10 Process unit 1. Harvest Unit 1. Harvest Sugar beet in field Top Removed root g 34.2 DM g H 2 O g 37.5 soil g 706.9root g 37.5 soil g g 1000 g Root harvested g Total 744.4g Dry matter 192.0g VS 152.7g VSND 14.4g VSED 138.3g VSED Carbohydrate g VSED Lipid 0.8g VSED Protein 7.8g Ash 39.3g Water 552.4g Composition of root +soil (stream 3) Top for animal feed Root for biogas production Soil : 22% of beet’s dry matter 1 2 3

11 Process unit 2. Cleaning Unit 2. Cleaning Root harvested Soil Removed g H2O 30.8 DM g 4.5 H 2 O g g DM 706.9root g 37.5 soil g g g Root cleaned 35.3 g VS 152.7g VSD 138.3g VSD Carbohydrate 129.8g Sucrose 101.2g Cellulose 6.5g Hemicelluloe 6.5g Pectins 15.6g VSD Lipid 0.8 VSD protein 7.8g VSND 14.4g VS Composition of cleaned root (Stream 6) Soil residue o 3.4% (dry cleaning) o 2.1% (wet washing) g ash g ash AgroTech (Jørgen Pedersen) Cleaned root

12 Process unit 3. Ensilage VS and BMP loss during ensilage GHG o CO 2 emission through ensilage : 12.7 L /kg beet o CH 4 emission during first period ( 2-3 weeks) : 1.24 L/kg beet 2.5% (Agrotech) o German study (Weißbach et al., 2011) o Our study o High BMP of alcohol

13 Process unit 3. Ensilage Unit 3. Ensilage Gas emission g H2O 22.6 CO 2 g 0.9 CH 4 g g DM g Silage 23.5 g VS loss until the end of March under careful storage o 16% g ash g VS AgroTech (Jørgen Pedersen) Root silage g H2O g DM g Root cleaned 8.5 g ash g VS Changes of Carbohydrate during ensilage Fraction : Weißbach et al., 2009

14 Process unit 5. Biogas production Methane production rate and cumulative yield Beet Cattle manure 3% of total biogas 92% of BMP removed 85% of BMP removed VS destruction

15 Overview of model 1( 1000 g of beet + cattle manure) Process unit (g)

16 Model for beet production per ha (139 ton/ha) (+381 ton cattle manure)

17 Energy production Model 1 (1000g)Model 2(ton /ha) CH4: 60.5g (84.7L) CO2: 125.1g(63.7L) Total: 185.6g(148.4L) Biogas 3.4MJ Energy 0.95Kwh Electricity CH4: 8.4.Mg (11780 m3) CO2: 17.4Mg (8855 m3) Total: 25.4Mg (20634m3) 43m3/ton Biogas MJul 941MJ/ton Energy 131Mwh (261Kwh/ton) Electricity

18 GHG emission using biogas technology ( Model 1) CH 4 : 4.177g (0.88g ensilage, 1.87g biogas plant emission, 1.42g after-storage) CO 2 : 28.9g (mainly from ensilage ) GHG as CO 2 eq. : g With Biogas production CH 4 : 4.183g, CO 2 : 7.3g, GHG as CO 2 eq. : 111.9g Without biogas production GHG emission from beet silage included High CO 2 emission from ensilage CH 4 emission from ensilage Emission from a biogas plant No GHG reduction, may be due to


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