Denver Zoo, Zero Waste Program (Biomass Gasification)

Here’s the description of the gasifier from the Rocky Mountain Chapter, ASHRAE (American Society of Heating, Refrigerating, and Air-Conditioning Engineers) 2015 conference:

Denver Zoo’s Waste to Energy Program will convert 90% of the Zoo’s waste (from trash to animal waste) to clean, sustainable energy by using a biomass gasification system. The process of becoming a zero waste facility by 2025 starts with reducing the waste stream and promoting recycling and ends with converting remaining waste to energy. The biomass gasification project will chemically convert zoo waste in a high temperature, low oxygen process into a usable combustible gas. The resulting energy generated is expected to meet 20% of the zoo’s energy needs while managing the expectations of the owner and design team.

But does the use of the gasifier really reflect zero waste principles?