AWWA ACE68917

This powerpoint presentation begins by providing a brief overview of a 1.5 mgd submerged ultrafiltration (UF) membrane facility in Puerto Rico. Its source water is Lagos Guajataca, PREPA impoundment. The finished water often exceeds secondary drinking water standard (SDWS) for manganese (Mn) of 0.05 milligrams per liter (mg/L). The objective was to: characterize raw water; evaluate alternative treatment processes for Mn; select recommended treatment process; and, prepare preliminary capital costs. Raw and finished water characterization is presented, along with current treatment processes, manganese reduction / removal treatment alternatives, recommended treatment method, and capital cost estimate. Other recommendations include the following: institute coagulant addition (PACl or ACH) with rapid mix device; add self-cleaning strainer for raw water; and, determine adequacy of membrane integrity test apparatus. Includes tables.