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Wastewater administrator outlines Class A power project: new digesters, methane recovery and $200M+ cost estimate
Summary
Mark Heinser presented a multiyear Class A power project for the wastewater plant, proposing IFAS upgrades, four new anaerobic digesters, methane-to-electric generators and a biosolids dryer; preliminary cost ranges were $70–80M for liquid-process and $130–150M for biosolids processing, with phased deployment and energy-recovery goals.
Mark Heinser, administrator of the wastewater department, briefed the council on a multiyear Class A power project at the wastewater plant that would replace aging systems, broaden digestion capacity and capture methane for on‑site electricity generation.
Heinser began by reviewing a 2013 consent decree with the EPA and Tennessee: over the last 13 years the city pursued collection-system rehabilitation, pump‑station work and tank construction to address chronic overflows and is now on track to finish stipulated projects about six months early. He said the result has been elimination of chronic overflows and a 90–95% reduction in overall overflows.
At the plant, Heinser proposed decommissioning a 45‑year‑old cryogenic oxygen plant that costs roughly $1 million a year to run, and retrofitting aeration…
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