The Central Arizona Project (CAP) is required to provide potable water at its eight
pumping plants which are part of the CAP canal system to comply with state and federal
Occupational 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 treatment
system at the remote pumping plants to treat raw Colorado River water to potable
standards, and connect to each plant's existing, though non-potable, domestic water
system. 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 Water
Treatment Rules (SWTR), which require turbidity levels to be 0.3 NTU or less in 95
percent 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 used
package ultrafiltration systems, each with a target production rate of 50 gpm, were
compared for potential use in the CAP pumping plants. These systems included the GE
HomeSpring, the Siemens Memcor XP, and the WesTech AltaPac.
Each system uses chlorine tolerant hollow fiber membranes and is operated in an
outside-in mode with a flux range from 22 to 40 gfd. However, each ultrafiltration system has specific
components and unique operating characteristics. The primary difference between the
systems is the backwash/chemical cleaning mode. Site visits to three facilities, which
have been treating surface water with each ultrafiltration system, were conducted to
compile performance and operational experience of each facility/ultrafiltration system. Includes table, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 940 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 7 |
| Published : | 11/01/2009 |
