AWWA ACE69121

This powerpoint presentation begins by providing a brief overview of the project objectives that include the following: work performed for PRASA to evaluate alternative water supplies; feasibility study for a reverse osmosis water treatment plant using brackish water discharged from Cano Tiburones near City of Arecibo; feasibility study for a reverse osmosis water treatment plant using brackish groundwater from South Coast Aquifer near City of Salinas. Treatment processes are presented that were selected to provide adequate pretreatment for RO. Conclusions on the Arecibo RO WTP indicate the following: it is feasible and can be implemented; suitable WTP sites are available; finished water tie-in points are available; permittable concentrate disposal points are available - may be time-consuming; raw water supplies are likely adequate - further proof is needed; costs are relatively high, but not unreasonable and should decrease on a per gallon capacity basis with further project development. Presentation conclusions for the Salinas RO WTP include the following: it is feasible and can be implemented; suitable WTP sites are available; finished water tie-in points are available; permittable concentrate disposal points are available - may be time-consuming; raw water supplies are likely adequate - further proof is needed; and, costs are relatively high, but not unreasonable and should decrease on a per gallon capacity basis with further project development. Includes tables, figures.