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Spring Hill staff outline corrective plan for wastewater plant nitrogen and digester issues; technical fixes likely to be expensive
Summary
Staff reported improved nitrogen readings and recommended next steps after TN‑POP technical assistance, but said the converted digester is likely the bottleneck that will require design and capital work.
City staff told the Board of Mayor and Aldermen on Aug. 18 that operational changes and a state‑run optimization program (TN‑POP) have driven down nitrogen levels at the Spring Hill Water Reclamation Plant, but that solids handling and a converted digester will likely require major capital fixes.
Staff recapped a multi‑year sequence of problems and repairs: in 2023 new oxidation ditches were brought online and later required liners and other fixes; digester pumps failed in late 2023 and required extended repairs; the city later rented a belt press to remove excess sludge and has continued operational work. Jessica (wastewater staff) said the plant has seen a marked improvement in weekly nitrogen measurements: the last 12 weekly samples reported in the meeting…
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