Request for Proposal: Primary Digester Mixing System and Cover Replacement Project

The City’s primary digester mixing systems are currently inoperable and the covers have reached the end of their useful life.

The proposed project will include the cover replacement and mixing system improvements of primary digesters 1, 2, and 3. The existing floating covers are to be replaced with a short skirt fixed steel cover and geomembrane seal. Mixing is to be accomplished utilizing high flow, moderate velocity, external, non-clog centrifugal pumps with liquid surface turbulence.