1. Nov. 2007 1 CO-DIGESTION Oosterhof Holman Milieutechniek B.V. Kievitsweg 13 NL-9843 HA, Grijpskerk The Netherlands. Tel.:(+31)(0)594 – 280 123 Fax: (+31)(0)594 – 212 883 E-mail:info@oosterhof-holman.nl

2. Nov. 2007 2 Oosterhof Holman 2007 Oosterhof Holman Beheer bv

3. Nov. 2007 3 Oosterhof Holman in the Netherlands Grijpskerk Groningen Kootstertille Giekerk Harlingen Arnhem AMSTERDAM

4. Nov. 2007 4 Principle Co-digester Biogas CHP Engine Manure Energy crops compost biogas

5. Nov. 2007 5 Rules of Thumb 1 m³ pig manure (PM) produces about 30 m³ of biogas 1 ton of corn produces about 180 m³ of biogas Mixture: about 2 to 1 (2 ton PM/1 ton Corn), total dry matter content must be smaller than 20%. 1 m³ biogas generates about 1.8 kW of electricity. Typical investment (Netherlands) : –190 kWe installation: € 0,6 million –1000 kWe installation: € 2.5 million

6. Nov. 2007 6 Co-digestion in the Netherlands Operational: 60 installations (25 built by Oosterhof Holman) Max. Potential: 1000 installations, 300-500 MW installed electrical power. Depends on electricity price, or possible gate fee for raw materials.

7. Nov. 2007 7 The Installation Storage of raw materials Dry Matter Feeding System 1 or more digesters 1 or more second stage digesters 1 or more CHP Plants Transformerstation Heating system Process Control Sytem

8. Nov. 2007 8 Storage of raw materials

9. Nov. 2007 9 Dry Matter Feeding System Screw Systems

10. Nov. 2007 10 Dry Matter Feeding System Trioliet Walking Floor

11. Nov. 2007 11 Digesters

12. Nov. 2007 12 Second stage Digesters

13. Nov. 2007 13 Combined Heat & Power Plants

14. Nov. 2007 14 Heating System

15. Nov. 2007 15 Typical Examples Donderen, the Netherlands

16. Nov. 2007 16 Typical Examples Jelsum, the Netherlands

17. Nov. 2007 17 Typical Examples Winsum, the Netherlands

18. Nov. 2007 18 Typical Examples Haulerwijk, the Netherlands

19. Nov. 2007 19 Optional Drying of the digestate –Compost (dry matter) –Fertilizer replacement (liquids) Green Gas production –Mixing into natural gas grid –As vehicle fuel