AWWA WKICO66043

This powerpoint presentation begins by providing a brief overview of the occurrence of nitrate and perchloratein California groundwater. Project objectives were to:evaluate nitrate treatment options forconversion from ISEPTM to Single Pass IonExchange at the Valley County Water DistrictArrow Lante Treatment Facility; and, provide a cost comparison of the identifiednitrate treatment options. Nitrate treatment technologies for the Valley County included: Tailored single pass ion exchange (IX);existing ISEP™ units; and,various blending/extraction options. Capital and operation and maintenance (O&M) costs to removeperchlorate and nitrate are presented, along with cost comparison, and application to other utilities with bothperchlorate and nitrate contamination. Conclusions were that: nitrate removal cannot be achieved with SinglePass IX; the resin is expected to becomesaturated within 24 hours;the use of regenerable ion exchange (e.g.,ISEPTM) for nitrate removal is a proventechnology and ISEPTM is already onsite; at Valley County, nitrate levels can be reducedto < 8 mg/L as N by treating 33% of the totalflow through the ISEPTM;five extraction/blending scenarios wereidentified, more information is needed beforeany of the scenarios can be recommended; total costs are higher for nitrate treatment viaISEP than for blending due to the O&M costs(e.g., salt purchases);however, retention of one or both ISEP systemwas recommended to provide maximum flexibility formeeting the nitrate MCL; and,if desired, alternate extraction/blending optionscould be explored in conjunction with installingsingle pass IX and bypass piping for the ISEP. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

01/01/2008

Number of Pages:

22

File Size:

1 file , 570 KB