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Harnessing the energy of biogas

Harnessing the energy of biogas. Dr Leonid Itskovich Energy Manager. Energy Awareness Week, Christchurch, May 2010. Harnessing the energy of biogas. 1980s: Christchurch Wastewater Treatment Plant 2007: QEII 2010: Christchurch Art Gallery 2010: WWTP Biosolids Dryer

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Harnessing the energy of biogas

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

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

  4. Digester Gas: Christchurch Wastewater Treatment Plant

  5. Digester Gas utilisation • 730 m3 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. 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. Landfill Gas • 1000 m3 of gas per hour • 50-60% methane • Methane - a powerful greenhouse gas with 22 times more impact on climate change than carbon dioxide.

  8. Biogas and the City

  9. Biogas and the City

  10. Biogas and the City

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

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

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

  14. Gas collection well-head on Burwood Landfill

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

  16. Landfill gas boilers at QEII Sports Centre

  17. Landfill gas co-generation engine at QEII

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

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

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

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

  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

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