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Staff outlines Hazen alternatives and wide cost range for treatment-plant expansion; board cautions pending TDEC sign-off
Summary
Hazen presented six alternatives for the treatment-plant expansion, with staff favoring conversion to plug flow or an oxidation ditch with biological phosphorus removal; estimates are planning-level (class 5) with a wide +/- range and an example Phase 1 planning cost cited at $80 million. Hazen expects to submit a TDEC permit application in about 12 months, though board members urged caution until formal approvals arrive.
Staff updated the board on alternatives analysis completed by Hazen for a planned expansion of the Stone River water-treatment facility. Speaker 2 summarized six technology pathways: oxidation ditch with chemical phosphorus removal; oxidation ditch with biological phosphorus removal; oxidation ditch plus hydrocyclones; conversion to plug flow; plug flow with densification; and a mobile organic biofilm option.
Speaker 2 said the analysis applied weighted criteria—reliability, flexibility,…
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