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Committee approves replacement plan for ozone destruction units; forwards purchase to council
Summary
The committee voted to forward a recommendation to city council to replace ozone destruction blowers at the Nolan plant; staff said the units are at end of life, vendors are limited, and the purchase will exceed the department's sole-source threshold and therefore needs council approval.
Scott Murphy of InfoMark told the Utilities Committee on May 13 that the existing ozone destruction blowers at the Nolan wastewater plant have reached the end of their service lives and are undersized for peak hydraulic pulses.
"Our units that exist out there are rated to remove 45 CFM...The actual requirement now, based on the calculation, is more than 1 of the ones that's 655 CFM," Murphy said, describing peak demands that occur only at certain times. He said vendors for the larger units are rare and staff received one responsive bid that sized two units at 350 CFM each to meet the 655 CFM peak requirement.
Why it matters: ozone is used as a disinfection and polishing step at the Nolan plant. Murphy said the equipment is power- and oxygen-intensive and that the media in the destruction units must be kept warm and dry to function. He noted ongoing operating costs such as liquid oxygen purchases and power usage.
The committee voted to forward the purchase to the Fayetteville City Council for approval. A member moved to forward the item; another member seconded and the committee chair called the vote. The presenter said the purchase price is about $44,000 and will be under $50,000 but above the city's sole-source threshold of $35,000, which is why council approval is required.
Discussion and follow-up: staff said replacement media is long-lived if temperature and dryness are maintained and that primary replaceable parts are regenerative fans with typical service lives of about five years. Murphy said staff will proceed with the procurement and take the required competitive/sole-source documentation to council.
