Case Study Supply and Installation of Clean Tech provided by Greentec Ave., Vancouver

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1 Case Study Supply and Installation of Clean Tech provided by Greentec Ave., Vancouver Project Size: Project Site: Homes: GHG reduction over lifecycle: Material Recovery per year: Composting: Other Benefits Supply Organic Waste input processed: Feedstock: Technology: ~2.0 MW combined heat and power British Columbia up to 900 lower mainland homes supplied with clean energy 250,000 metric tones of CO2 diverts over 200,000 tones of reusable materials from landing in the landfill produces top quality compost New Green Jobs, Back-up Power for Peak 27,000 to 40,000 tons per year Yard Debris and Food Scraps High Solid Anaerobic Digestion (HSAD) Technology

2 Technology and Scope of Supply Function of a Tank-mounted Double Membrane Gasholder and for the construction of modern anaerobic digester The outer membrane is the protection layer and is under constant air pressure, which is necessary for the statics of the gasholder. The outer membrane has an integrated inspection window through which you can check the processes inside at any time. The useful storage is the inner membrane. This membrane moves up and down with the volume of the biogas. The connection of those two membranes to the tank will be achieved by using a clamping ring.

3 Each gasholder is customized according to project specifications (e.g. wind load, operating pressure, etc.). The membrane is fabricated of PVC coated polyester of which both sides are treated with a finisher and softener, UV- protection, fungicide, and flame retardant. For protections against chemical compounds in the gas (e.g. methane, hydrogen sulfite, carbon monoxide etc.) the inner and bottom membrane are treated with a special coating. A safety valve against overpressure is also included in the delivery. The air blower provides the necessary pressure between the two membranes, which allows the outer membrane to withstand external forces like snow and wind loads and also creates counter pressure for the gas system. A separate air hose connects the air blower with the gasholder. A second valve, the pressure-regulating valve, protects the gasholder against overpressure from the air blower. This valve constantly checks the air pressure (operating pressure) and closes automatically in case of a power loss. The filling level sensor monitors the biogas storage volume. This controls the supply of biogas to the engine generator and regulates optimal utilization of the available storage volume (e.g. gas engine: start at 90% filling level, stop at 10% filling level).

4 A complete unit, except tank, consisting of: Scope of supply 1. External- and internal membrane 2. Belt support construction inclusive fastening material 3. Middle mast plate 4. Middle mast 5. Air support blower 6. Air-hose inclusive accessories 7. Overpressure safety valve 8. Vacuum safety valve 9. Anchoring 10. Accessories for the anchoring 11. Sealing strips 12. Gas production connection and gas withdrawal connection - provided by end-user 13. Pressure regulating valve 14. Non return valve 15. Top dome 16. Inspection window 17. Filling height measurement 18. Operations and Maintenance Manuals 19. Shop drawings

5 Benefits of Technology Technical: Every Double Membrane Gasholder is tailored and calculated to customer s specific requirements Membranes are specifically developed for the storage of renewable natural gas Hydraulic safety valves are maintenance free Only high quality stainless steel parts are used Quick installation and low maintenance The biogas storage system exceeds international standards of municipal and industrial wastewater projects and provides high resistance vs. wind and snow loads Economical: Efficiency in engine generator operation Supply energy on-demand Shift power production to peak pricing periods Balance fluctuations in biogas production Improve plant efficiencies Reduce operation and maintenance costs Reduced project costs

6 Installation To maintain the warranty, we recommend that the installation on project site be done with a specialist from Greentec Ave. The installation process took 3 days. For the installation Greentec Ave. provided on site helpers, equipment and electricians. A crane for lifting the membranes onto the tanks, and a truck were also provided. Picture: Installation steps

7 Results Picture: Installation Team Picture: After Installation by Greentec Ave.

8 About Greentec Ave., Vancouver Greentec Ave. supplied and installed customized double membrane gasholders to the project. The double membrane gas storage systems were successfully installed on Aug 7th, 2012.Both installed gas storage systems operate at highest performance and achieved a total of >30,000 operating hours since. Compared to other digester rooftop-mounting systems (steel, glass, aluminum), the air-pressured double membrane concept proofed to be most economical and became the leading safety standard in modern digester construction, providing cost savings in millions of $ to communities and governments. Projects like these are proof of Greentec Ave s capability to identify, evaluate, customize, transfer, manage, install, service and distribute reliable and effective high quality clean technologies with substantial benefits to Canadian end-user, seeking highest performance, durability and safety. Building a stronger and more powerful green economy in Canada is our mission and we congratulate all involved project participants and collaborators in this project to their success and outstanding achievements. For more information, please contact: info@greentechavenue.com