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Arizona waste treatment plant gets biomethane upgrade

Pima County signs contract with Anaergia to use the biogas from wastewater as a renewable fuel source.

Anaergia Inc. and its project partner Grannus Biogas, LLC, have signed a contract with the Pima County Regional Wastewater Reclamation Department in Arizona to design-build-finance-own-operate large-scale biomethane upgrading facility. The new plant will create biomethane — which is compositionally similar to natural gas — with the goal of displacing non-renewable fossil fuels.

According to Jackson Jenkins, director of Pima County Regional Wastewater Reclamation Department, the new biomethane plant will help the country better meet the needs of its residents. “We are very pleased Anaergia will provide Pima County with the best technological solutions available globally, that are both economically and environmentally responsible,” he said.
Pima County Regional Wastewater Reclamation Department operates nine wastewater treatment facilities in Pima County, which generate biosolids that can be used to create biogas. The majority of biosolids generated at these wastewater plants are transferred to a centralized wastewater biosolids handling and treatment facility located at the Tres Rios Water Reclamation Facility just outside of Tucson, Arizona, in the Town of Marana. At that facility, biosolids are processed in anaerobic digesters, producing a continuous supply of digester gas which is currently flared.
Pima County’s primary project goal is to utilize its biogas in an environmentally sustainable manner that generates revenue and can offset wastewater treatment costs. This design-build-finance-own-operate plant will allow the Pima County Regional Wastewater Reclamation Department to focus on its core business of wastewater treatment plant operations and regulatory compliance. At the same time, it will create a long-term partnership with Anaergia/Grannus Biogas, to not only deliver and operate the biogas upgrading facility, but to market and sell the commercial biomethane product as well.

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