AWWA ACE61641

The objectives of this project were to compare the performance of various anti-scalants for the treatment of brackish groundwater at Alameda County Water District's Newark Desalination Facility (NDF), and to evaluate membrane performance with regard to scale formation without the addition of sulfuric acid to the reverse osmosis (RO) feed water at the NDF. Testing was conducted using a custom made RO pilot unit designed to carry out two separate tests simultaneously by utilizing a two-train parallel arrangement. The two identical pilot trains and the main plant received raw water with identical characteristics. Each train is equipped with dedicated antiscalant and acid metering pumps. The two stage array with ESPA1 membranes in stage one and ESPA2 membranes in stage two replicates the two-stage array currently in use at the full-scale NDF.