AWWA ACE65167

The City of Scottsdale's Chaparral Water Treatment Plant recently began operationtreating Salt River Project water using an innovative integrated process consisting ofcoagulation for arsenic removal, direct filtration through submerged ultrafiltrationmembranes, and granular activated carbon (GAC) contactors for removal of total organic carbon (TOC) and taste and odor causingcompounds. Ancillary processes include plate settlers for wash water recovery andcentrifuges for solids removal. The unique process for this new 30 mgd facility wasdeveloped through six months of pilot-scale operations which competitively evaluatedfour membrane systems as well as ozone and two different types of GAC. Membraneprocesses were preferred due to the very small site and the highly variable water qualitydelivered to the plant. The entire facility, including the 5.5 MG buried reservoir, sits ononly 11 acres and is constructed to minimize neighborhood impact.Substantial challenges existed for the design and construction of the facilities. In additionto a very small, irregularly shaped site, the issues of adjacent neighbors needed to beaddressed, views of Camelback Mountain needed to be maintained, the park facilitiesneeded to be upgraded, significant variations in turbidity and arsenic needed to becontrolled, and disinfection byproduct (DBP) formation needed to be reduced in the system. Clearly, an advancedtreatment system to treat multiple challenges was required.

Product Details

Edition:

Vol. - No.

Published:

06/01/2007

Number of Pages:

5

File Size:

1 file