The Des Moines Metropolitan Wastewater Reclamation Authority (WRA) treats 63,000,000 gallons of wastewater and produces 1,400 MMBtu per day of biogas. The excess gas was flared. WRA wanted to upgrade the biogas for pipeline injection to renewable natural gas (RNG) and to use resulting revenue through the sale of natural gas and energy credits to offset capital and operating costs at the facility.
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