Co-Digestion of Biodiesel Waste at El Paso’s Haskell Street WWTP Client: El Paso Water Utilities Location: El Paso, TX With a local biodiesel company hauling its liquid waste 200 miles away for disposal, Hazen and Sawyer assisted El Paso Water Utilities (EPWU) in evaluating the benet of leveraging the excess anaerobic digester capacity at the Haskell Street WWTP for co-digestion of the biodiesel waste. Based on the quantities available, Hazen partnered with Georgia Institute of Technology to perform bench-scale digestibility testing to help ensure stable digester operation at the design loading rates and conrm digester gas production of the biodiesel waste.Haskell Street WTTP’s excess digester capacity can save over $500,000 year in purchased power by codigesting biodiesel wastes. Benc

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