WRA along with partners at CDM Smith Inc. were recognized with an Engineering Excellence Award for their work on the RNG Pipeline Injection project.
The Des Moines WRA was recognized with the Grand Conceptor Award at the 2022 Engineering Excellence Awards by ACEC Missouri. The award recognizes WRA's work with CDM Smith Inc. to utilize one of the largest co-digestion programs in the country to improve performance of its digesters, reduce maintenance costs and install a biogas treatment system that converts biogas into renewable natural gas (RNG).
CDM Smith led the design of a biogas conditioning and injection system to convert about 2,250 scfm of biogas produced at the facility into a high-quality biomethane product that is injected into the MidAmerican Energy Company’s local natural gas pipeline. Net revenue generated by this arrangement is approximately $3.5M annually, resulting in a 4.5-year payback period. This project demonstrates how the recovery of a waste resource—such as biogas from the WRF—is environmentally resilient, economical for its ratepayers, and supports the sustainability initiatives and financial goals set by the WRA.