Presentation delivered at Renewable Energy Association Bioenergy Conference - 8th October 2009

1. Industrial digestion & MBT-AD Integration with Gas Engines Renewable Energy Association Bioenergy Conference 8 th October 2009 Alex Marshall

2. Graveyard slot!

4. Locations 9 Territories Globally

5. Timeline

6. Clarke Energy MW Installed Bioenergy

7. MBT-AD and industrial digestion comparison Landfill, RDF To land Digestate utilisation Intensive Light Mechanical pre-treatment Highly varied Packaging, sand Contaminants Mixed wastes Food waste, biowaste, slurries, energy crops Input Gate fee, energy, sale of recyclables Gate fee, energy Revenue MBT-AD Industrial AD Factor

8. Food Waste & Co-Fermentation Source: Haase Midlum, Sibstin plants

9. MBT – AD Source: Haase Goettingen MBT facility

10. Gas contaminant comparison *Volatile organic silicon compounds Possible Yes Mixed waste No Yes Food No Yes Maize Yes Yes Sewage Yes Yes Landfill VOSCs* Hydrogen sulphide Biogas type

12. H 2 S Reduction - Air dosing Biological desulphurisation – the H 2 S will be converted into sulphur Source: MT Energie

15. GE Jenbacher gas module Heat recovery -heat exchanger Engine Engine control panel Generator

16. Energy balance HE 1 - Mixture intercooler HE 2 - Oil exchange heater HE 3 - Engine jacket water heat exchanger HE 4 - Exhaust gas heat exchanger

17. Typical engine integration

18. Heat limits & hazards Acid dew point 220 50 Exhaust gas Condensation 80 55 Intercooler Viscosity 90 70 Lube oil Overheating 95 57 Jacket water Danger Max. ( o C) Min. ( o C) Heat source

19. Engine integration Evaluate Evaluate Residential/ Industrial heating Heat sink Yes No Reduce weight Increase CV Digestate drying Evaluate Yes Pathogen kill Pasteurising Evaluate Yes Encourage microbial action Digester heating Exhaust gas Jacket water Purpose Heat use

20. Engine integration Exhaust heat Jacket water, oil heat & intercooler ~400 º C 90 º C Drier 2-300 º C Air Heat exchanger Pasteuriser External heat sink Digester District heating Industry

21. Pasteurisation unit integration Pasteurisation Inflow from buffer tank Outflow to digesters Heating water from CHP Fill 70 O C 1hr Purge

22. Biogas utilisation – GHG Savings Source: Optimierungen fur einen nachhaltigen ausbau der biogaserzeugung und nutzung in Deutschland (Ifeu et al . 2008)