AWWA MTC64529

This slide presentation begins by outlining background information on the Tampa Bay Seawater Desalination Project. Project history is then outlined along with deficiencies that occurred in the following processes: Pretreatment; reverse osmosis (RO); post-treatment; and, inadequate design and manufacturing. AWP RO modifications included: replace Clean-In-Place (CIP) piping with fiberglass piping; add CIP VFD, cooling water system; move Bisulfite dosing after cartridge filters; replace membranes: 3-5 configuration; add high quality permeate flow control; add valves to isolate arrays; add air vents, replace PVC permeate lines; and, modify RO materials piping, valves. Schematics are provided of the original pretreatment waste treatment system, the modified waste treatment system, and the post-treatment and transmission system. AWP Post Treatment and Transmission Modifications included: add 2 static mixers in permeate pipeline; quick lime feed system converted to hydrated lime; add VFD control lime pumps; add second lime silo; double the CO₂ feed system capacity; and, revise control system. Project challenges are listed along with all-in cost of desalination.