AWWA ACE62951

This slide presentation outlines research on pretreatment with magnetic ion exchange resin to reduce total organic carbon (TOC), disinfection byproduct (DBP) precursors, and residuals production. Goals of new treatmentstrategies for Canyon Road included: improve TOC and DBP precursor removal;improve turbidity applied to filters; flexibility to respond to challenging conditions; and,reduce or limit operational complexity. Turbidity implications duringMay/June snowmelt runoff are outlined and include: MIEX alone;contact clarifier (coarse media,upflow filter) and dissolved air flotation (DAF);plate settler without MIEX; and,plate settler with MIEX. Turbidity and filter headloss (36 min. floc., plate settler, and filter skid) in September 2005 is outlined and included:without MIEX - turbidity - with and without non-ionic poly, andfilter headloss; and, with MIEX - turbidity - with and without non-ionic poly, andfilter headloss. Organic contaminants were evaluated for: color; DBP precursor removal; and,molecular weight scan. Research on residuals included: impact of lower alum dose with MIEX; and, brine from MIEX. Outline summary includes: alum with versus without MIEX indicatedsettled turbidity lower with MIEX, and without MIEX could not reduce 5-day DBP SDS <64/48,but could with MIEX + alum;goals were achieved with MIEX at 4 to 6 timeslower alum dose than without MIEX;lower alum dose means less challenge to clarifiersand filters, and less residuals handling; and,MIEX adds new residuals stream (brine waste).Other observations included:36 minutes flocculation needed without MIEX (24 with MIEX);alum + LT22s worked with and without MIEXwhen no MIEX, non-ionic also needed, but with MIEX, non-ionic produced unacceptably high filterheadloss (at doses tested). Includes figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2006

Number of Pages:

59

File Size:

1 file , 850 KB