1. 1 Harnessing the energy of biogas Dr Leonid Itskovich Energy Manager Energy Awareness Week, Christchurch, May 2010

2. 2 Harnessing the energy of biogas 1980s: Christchurch Wastewater Treatment Plant 2007: QEII 2010: Christchurch Art Gallery 2010: WWTP Biosolids Dryer 2010: New Civic Building

3. 3 Biogas utilisation efficiency gas escaping to atmosphere flare flare heating fuel co-generation (electricity+heat) tri-generation (electricity+heat+refrigeration) tri-generation (electricity+heat+refrigeration) city-wide bio-energy system! city-wide bio-energy system!

4. 4 Digester Gas: Christchurch Wastewater Treatment Plant

5. 5 Digester Gas utilisation 730 m 3 of gas per hour 63% methane compressed gas - fuel for Council’s vehicles (1983-1994) electricity and heat generation since 1996 11,000,000 kWh per annum of electricity

6. 6 Burwood Landfill 90 hectares Up to 25 m deep Up to 264,000 tonnes of refuse per year 60% organic waste Operated 1984 – 2005

7. 7 Landfill Gas 1000 m 3 of gas per hour 50-60% methane Methane - a powerful greenhouse gas with 22 times more impact on climate change than carbon dioxide.

8. 8 Biogas and the City

9. 9

10. 10 Biogas and the City

11. 11 Directional drilling for 18-kilometre gas pipeline Burwood Landfill - QEII – WWTP – New Civic – Art Gallery

12. 12 Burwood Landfill 90 hectares Up to 25 m deep Up to 264,000 tonnes of refuse per year 60% organic waste Operated 1984 – 2005 Gas pipelineTreatment plant & flare

13. 13 Landfill gas utilisation at QEII Landfill 15 gas collection wells Flare Condensate collected & returned to landfill Gas chiller & condensate collection Cogeneration Underground gas pipeline 3.7 km Burwood Landfill QEII Fan Boiler 2 Boiler 1 Heat and electricity used in QEII sports centre Gas CollectionGas TreatmentGas TransportGas Combustion Pipeline to WWTP Pipeline

14. 14 Gas collection well-head on Burwood Landfill

15. 15 Burwood Landfill Gas Treatment Plant Chillers Flare Inward gas pipe Condensate collectors Compressors Controls Blast chiller Controls Fan

16. 16 Landfill gas boilers at QEII Sports Centre

17. 17 Landfill gas co-generation engine at QEII

18. 18 Under construction: biogas boiler for biosolids dryer at WWTP

19. 19 Under construction: Biogas and wood chip boilers for biosolids dryer at WWTP

20. 20 Absorption chiller – part of Tri-generation plant at New Civic building

21. 21 Biogas projects: benefits replaces 2.1 million litres of LPG each year (fossil fuel) replaces 16 million kWh of electricity from grid pa saves city ratepayers $3M each year in energy costs carbon credits sold to British Gas ($4M) better environment the landfill can more easily be re-vegetated because the landfill gas that damages plant roots is captured.

22. 22 Acknowledgement of expertise and assistance BECA Powell Fenwick Consultants Rockgas (Contact Energy) Energy For Industry (Meridian Energy) EECA Contractors and equipment Suppliers

23. 23 Harnessing the energy of biogas Further information: http://www.ccc.govt.nz/EnergyEfficiency/Projects/WasteToRenewableEnergy.asp http://www.energie-cites.eu/db/christchurch2_575_en.pdf http://www.energie-cites.eu/db/christchurch_113_fr.pdf Energy Awareness Week, Christchurch, May 2010