AWWA ACE70797

This powerpoint presentation begins by providing a brief overview of a pilot study of a desalination study at Santa Cruz, California, from March 2008 through April 2009.Pilot-scale facilities treated up to 50 gpm anddemonstrated technology to meet regulatorydrinking water standards,establish optimal design and operatingparameters, andcompare pretreatment and reverse osmosis (RO) alternatives. The pilot plant process diagram of 4pretreatment trains and 4 RO trains is presented, along with RO systems, single stage configuration, two-stage LPRO/SWRO, projected energy usebefore testing, water quality results - chloride, boron and bromide, relevant regulatory standards, impact on usefor irrigation, and example of boron toxicity - mild andadvanced necrosis. Conclusions indicate that: single stage ISD: achieves best balance of waterquality and energy use (at 45-50% recovery);two-pass system: recommended to reduce impacton TTHM formation with free chlorine;two-stage LPRO/SWROdoes not achieve boron regulation or bromide goal,provides lower energy use at high recovery (55 %), andmay be feasible for lower boron source water(e.g., to reduce size of intake and pretreatment). Includes figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

28

File Size:

1 file , 3.7 MB