Full Description

The Central Arizona Project (CAP) is required to provide potable water at its eightpumping plants which are part of the CAP canal system to comply with state and federalOccupational Safety and Health (OSHA) requirements for plant personnel and visitor use.These plants are too remote to economically connect to a public water system. CAP decided to install a small package treatmentsystem at the remote pumping plants to treat raw Colorado River water to potablestandards, and connect to each plant's existing, though non-potable, domestic watersystem. Water treatment objectives consisted of the following: particulate(turbidity) removal; pathogen removal/inactivation; and, disinfection byproduct (DBP)control. Potable water turbidity standards have been established by the Surface WaterTreatment Rules (SWTR), which require turbidity levels to be 0.3 NTU or less in 95percent of all samples, with a maximum limit of 1.0 NTU in any sample. After considering three treatment technologies (pressurized granular media filters,cartridge filters, and ultrafiltration membranes), ultrafiltration technology was selected. Three commonly usedpackage ultrafiltration systems, each with a target production rate of 50 gpm, werecompared for potential use in the CAP pumping plants. These systems included the GEHomeSpring, the Siemens Memcor XP, and the WesTech AltaPac.Each system uses chlorine tolerant hollow fiber membranes and is operated in anoutside-in mode with a flux range from 22 to 40 gfd. However, each ultrafiltration system has specificcomponents and unique operating characteristics. The primary difference between thesystems is the backwash/chemical cleaning mode. Site visits to three facilities, whichhave been treating surface water with each ultrafiltration system, were conducted tocompile performance and operational experience of each facility/ultrafiltration system. Includes table, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 7File Size: 1 file , 940 KB