This paper presents the results of an extended series of pilot testing designed to use existing
and novel methods to control bromate formation at the Colored Water Treatment Facility (CWTF). Based on previous work
performed by other water utilities, information in the scientific literature, and some earlier
pilot testing performed by McGuire Environmental Consultants, Inc. (MEC) on a similar raw
water quality, a pilot plant was designed and constructed at the CWTF. The goal of the pilot
testing was to simultaneously produce treated water that would meet Mesa's color target of 7 to
8 color units (PCU) and the Stage 1 Disinfectant/Disinfection Byproduct (D/DBP) Rule
Maximum Contaminant Level (MCL) of 10 mg/L.
The pilot plant was used to test various combinations of allowable drinking water treatment
chemicals and their effect on bromate formation for the challenging raw water quality found
at the CWTF. When it became clear that the target water quality could not be reliably
achieved using chemical pretreatment alone, an additional treatment process (MIEX, or
Magnetic Ion EXchange) was tested. MIEX treatment had been previously shown to be
highly effective at color removal, and it was hypothesized that increased color removal
would result in lower ozone doses and reductions in bromate formation. Finally, when this
configuration was found to be insufficient for meeting both color and bromate targets, the
order of treatment was switched, and the MIEX treatment process was used as a polishing
step to remove color that was not previously removed by ozone treatment. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 20 |
| Published : | 11/15/2004 |
