Pine Water Association Slow Sand/Nanofiltration Demonstration Plant: Design Report

Abstract

Introduction: The Pine Water Association presently serves approximately 130 people domestic water and irrigation water in separate systems. Their water comes from a spring but flows in a creekbed before being diverted for domestic and irrigation use. As a result during storm runoff and snowmelt the water contains some sediment. Presently there is no filtration on the system. A sedimentation chamber plus chlorination is the only water treatment. The Environmental Protection Agency (EPA) has recently instituted a new requirement that all surface treated water has to be filtered. Lois Krebs of the Pine Water Association visited the 20,000 gallons per day (GPD) Consolidated Water Utilities Pilot Nanofiltration Plan on Sept. 8, 1989. This facility is approximately the same size that is needed by the Pine Water Association. However the nanofiltration capacity will need to be doubled due to a reduction in production during colder weather. Following this visit the Pine Water Association requested the University of Arizona help with the plant and a contract was signed.