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 treatment
strategies 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 during
May/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, and
filter headloss; and, with MIEX -
turbidity - with and without non-ionic poly, and
filter 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 indicated
settled 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 times
lower alum dose than without MIEX;
lower alum dose means less challenge to clarifiers
and 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 MIEX
when no MIEX, non-ionic also needed, but with MIEX, non-ionic produced unacceptably high filter
headloss (at doses tested). Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 850 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 59 |
| Published : | 06/01/2006 |
