Bigger Savings from Biogas


  • Jennifer Whitaker, Robert Wichser, and Thomas Frederick - Rivanna Water and Sewer Authority
  • Joe Rohrbacher, Bryan Lisk, Christopher Szoch, and C. Michael Bullard - Hazen and Sawyer

During the design of modifications to provide additional nutrient removal at its 57,000-m3/d (15-mgd) Moores Creek Wastewater Treatment Plant to achieve Virginia’s nutrient wasteload allocations, the Rivanna Water and Sewer Authority realized that it would need to make additional improvements to its aeration and digestion facilities.

The facility’s anaerobic digesters were heated by waste heat from the gas engines used to power the aeration blowers. Digester heating needs at times would govern blower operation, adversely affecting nutrient removal performance. Seeking to maintain its nutrient removal capability, as well as the practice of beneficially using biogas generated onsite, RWSA began evaluating option for optimizing the digester heating process.

The results of this evaluation have enabled RWSA to achieve significant energy savings, reduce greenhouse gas emissions, and improve treatment performance at its Moores Creek WWTP…

Read the full WE&T article.

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Horizons Fall 2017 (pdf)

Horizons showcases significant water, wastewater, reuse, and stormwater projects and innovations that help our clients to achieve their goals, and can help you achieve yours. Articles are written by top engineers and process group leaders, demonstrating and explaining the beneficial application of a variety of technologies and tools.

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