Specifications include, but are not limited to: The DAF Building at Marshalltown’s Water Pollution Control Plant (WPCP) houses two (2) dissolved air floatation (DAF) units for thickening of waste activated sludge (WAS) ahead of digestion. This project includes the replacement of Marshalltown's Water Pollution Control Plants the DAFs with two (2) new rotary drum thickener (RDT) units. One RDT will primarily be used for WAS thickening and the other RDT unit will serve as the standby WAS thickening unit and for thickening of digested sludge from 2.5% up to 7% solids. The polymer system, thickened sludge pumps, supporting electrical equipment, and HVAC equipment will be replaced with the project.The project also includes in-kind replacement of the Digester Transfer Pump for conveyance of digested sludge to the Thickened Sludge RDT.
