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Chicken manure biogas

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Cyseni presentation

  1. 1. Linas Jurgutis, Alvyra Šlepetienė Institute of Agriculture, Lithuanian Research Centre for Agriculture and Forestry (LAMMC) Instituto al.1, LT-58344, Akademija, Kedainiai Distr., Lithuania BIOGAS PRODUCTION FROM CHICKEN MANURE AT DIFFERENT ORGANIC LOADING RATES ONLINE CYSENI 2021 17TH INTERNATIONAL CONFERENCE OF YOUNG SCIENTISTS ON ENERGY AND NATURAL SCIENCES ISSUES 1
  2. 2. Presentation agenda 1. What is biogas? 2. Biogas industry future trends 3. Chicken manure biogas potential 4. Full scale biogas production process analysis 5. Conclusions 2
  3. 3. Biogas is a renewable and green energy source CH4 50-70% of biogas contains energy Electricity Heat Green gas Biogas helps to mitigate dependence on fossil fuels Waste to product Anaerobic digestion process converts organic waste into green energy and organic fertilizer Renewable energy Raw materials for biogas production are renewable sources Circular economy Nature -> Goods -> Waste -> Biogas-> Organic fertilizer -> Nature Environmental friendly Treatment of biogas helps to reduce CO2 emissions 3
  4. 4. Hydrogen and biomethane set for hyper growth in EU EU will phase out natural gas by 2050 and void will be filled by hydrogen and biomethane The European Green Deal puts the EU on a path to climate neutrality by 2050, through the deep decarbonisation of all sectors of the economy The energy system is crucial to deliver on these goals: biomethane (biogas) top priority due to its OPEX 4 Source: 2020 Gas Decarbonisation Pathways study, A Gas for Climate policy paper, European commission COM (2020) 299 final 2020 2030 2040 2050 Biomethane Hydrogen Natural gas
  5. 5. Europe biogas market will demonstrate 8.3% CAGR* up to 2040 5 Source: European Biogas Association Statistical Report 2020, CE Delft, Euro gas, Gas for climate, International Energy Agency (IEA) data *Compound annual growth rate 193 375 1020 1326 2019 2030 2040 2050 Europe biogas market potential, TWh biogas
  6. 6. 30-40% Processed into biogas. Chicken manure is the promising feedstock for biogas production 20 million tons per year of chicken manure produced in the world. Ammonia Inhibition Gravel/grit High amount of impurities in the feedstock 6
  7. 7. Biogas potential analysis for chicken manure : 312 ± 23 L CH4 kg-1 VS added 7
  8. 8. Full scale biogas production process analysis for chicken manure digestion 250 m3/h CH4 production 217 days experiment duration >5 000 tons of chicken manure processed >8 000 tons of water and recirculate used >13 000 tons of digestate produced 8
  9. 9. Full scale biogas production process analysis for chicken manure digestion Periods 1 2 3 4 Experiment period Stable Imbalance Acclimatization Acclimated Experiment duration days 25 21 60 111 Biogas production m3 t VS added 504 466 486 489 Biogas composition % CH4 60 53.3 57.9 58.6 Hydraulic retention time days 42 35 34 45 Organic loading rate (OLR) kg VS m3 d 2.22 2.24 2.27 3.14 VFA g/L 3.7 7.37 (peak at 10.8) 9.13 7.86 N-NH4 g/L 3.94 4.09 5.09 5.41 pH 8.04 7.40 7.98 7.96 FAN mg/L 604 598 566 542 Temperature °C 40.3 40.4 37.4 36.1 Process efficiency % 95.08 78.15 88.64 90.02 (peak at 93%) 9
  10. 10. Biomethane production efficiency in full scale anaerobic digestion experiment 10
  11. 11. Why the continuous fermentation temperature was 40 C at the beginning and why it was reduced to 36 C later? 0 100 200 300 400 500 600 700 6.9 7 7.1 7.2 7.3 7.4 7.5 7.6 7.7 7.8 7.9 8 8.1 mg/L pH Free ammonia nitrgoen concentration in relation to pH and temperature change 41 40 39 38 35 36 11
  12. 12. Why the process efficiency at the beginning was so high? How it is related to organic loading rate? • The high initial process efficiency might be related to: • lower ammonium concentration in the fermenter • lower VFA concentration due to: • Low process inhibition phenomena • Lower organic loading rate • The lower organic loading rate serves lower amount of nitrogen and organic matter introduced into the fermentation system and so the system can handle this easier (with no inhibition effect). Slower inhibiting agent build up. • System can also handle higher OLR, however, adaptation period with steady feeding is needed. Increased OLR Increased partial inhibition Decreased process efficiency Decreased amount of biogas (power) produced Increased feeding rate 12
  13. 13. Conclusions • As the demand for renewable energy is growing, chicken manure becomes an attractive feedstock for biobased energy production. The BMP results indicate that chicken manure produces 312± 23 L CH4 kg-1 VS added and the biogas yield per quantity of wet mass depends on the volatile solids fraction in the manure biomass. • The results obtained from the full scale anaerobic digestion plant from the 217 days’ operational period of chicken manure digestion as a mono substrate indicated that there is time required for acclimatization phase of the anaerobic digestion process. • This acclimatization should be performed by continuous steady supply of chicken manure into the bioreactor while maintaining constant organic loading rate. The acclimatization phenomena can be related to ammonium concentration in the fermentation media causing partial inhibition, which is reflected in biogas volume as well as energy content reduction. However, the data analysis of anaerobic digestion performance indicates that the system is able to adapt and acclimate to increased nitrogen concentration in the media. • Once adapted, the performance of biogas plant fermenter was able to deliver 93% of chicken manure biogas potential with a OLR of 3.14 kg VS L-1d-1 and TAN concentration of 5.5 g L-1. 13
  14. 14. Thank you Linas Jurgutis +37062187244 Linas.Jurgutis@lammc.lt 14

Chicken manure biogas

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