Case Study: New Tennessee Waste-To-Energy Plant

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Courtesy of PHG Energy, LLC

Clean Conversion Infrastructure Addition To Give Lebanon Renewable Energy

PHG Energy will provide the vibrant and growing Middle Tennessee city of Lebanon with a new method of sustainable waste disposal and renewable energy production when this system is completed in 2016. Commercial wood waste that was previously dumped into in area landfills, hundreds of tons of scrap tires, and local municipal sewer sludge will be blended to provide feedstock for the clean gasification process. Synthetic gas produced will fuel a generator to provide on-site renewable power to the wastewater treatment plant’s operations.

Projected Benefits:

  • 5,000,000 pounds (2,500 tons) of carbon emissions kept out of the air each year, which equates to the CO2 produced annually to provide electricity to 312 homes, or the annual Greenhouse Gas Emissions from over 450 passenger vehicles.
  • Over 16,000,000 pounds (8,000 tons) of material diverted from landfills each year.
  • System will create beneficial use of over 800,000 pounds (400 tons) of scrap tires each year.
  • Deployment will help both the city and local industries move to zero landfill goals.
  • Will produce 36,000 MW-hrs of power over 20 years (enough for 350 average homes).

The System Details:

  • 64-ton/day capacity throughput PHG Energy downdraft gasifier is the core technology
  • Wood and tires are cut to 1” to 3” size; sludge is blended with wood before gasification
  • 30% moisture content of total blend is target.
  • Syngas produced (92% by volume input) is combusted in industrial thermal oxidizer (an emissions control device).
  • Thermal energy is transferred to heat oil fluid, and hot oil drives an 400 Kw Organic Rankine Cycle generator.
  • 8% of input results in biochar which is 70%carbon and recyclable.
  • All feedstock is locally sourced and prepped by a specialty contractor.
  • Footprint of gasification plant is less than one acre.
  • Commissioning in 3rd quarter of 2016.

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