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City of Boulder, Colorado, Tetra Tech and CGRS partner on wastewater biogas project

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The City of Boulder, Colorado, US, has partnered with Tetra Tech and CGRS on a wastewater biogas project.

Construction on the biogas use enhancement project is almost halfway complete at the city’s Water Resource Recovery Facility (WRRF). Biogas produced from wastewater digesters will be converted into renewable natural gas (RNG) for vehicle fuel and will be delivered to community partners for use after injection into the Public Service Company of Colorado pipeline.

The city partnered with Pasadena, California-based Tetra Tech and Fort Collins, Colorado-based CGRS to design and build the biogas-to-RNG conditioning system, which will replace the WRRF’s co-generation system that is at the end of its service life.

Tetra Tech is providing engineering, procurement and construction services and CGRS is serving as a general contractor and design-build partner, overseeing and performing the majority of on-site construction work.

Western Disposal has agreed to purchase the RNG to fuel some of its vehicle fleet – around 31 trucks. The project will also enable the city to take advantage of revenues available to renewable fuel producers under the Environmental Protection Agency’s Renewable Fuel Standard (RFS), which will drive a projected return on investment in the next 10-15 years.

Chris Douville, wastewater treatment manager for the City of Boulder, said: “The biogas use enhancement project is the next logical step toward making WRRF more environmentally sustainable as well as economically viable.

“We’re pleased to realise the positive impact on the community’s climate goals through production and use of RNG as a vehicle fuel, as well as the city’s financial ability to support other renewable energy and sustainability projects in the future through the sale of RNG.”

“CGRS is excited to lend its design-build experience in RNG facilities to Tetra Tech and the City of Boulder on this innovative project,” commented CGRS project manager Greg Steed, PE. “Not only will this project reduce another Front Range community’s environmental footprint, but it will also enhance services to Boulder residents, and we are honoured to be a part of it.”