Characterization of dissolved organic matter (DOM) is extremely important for water utilities in
order to minimize potential detrimental effects of disinfection byproducts formation, fouling of
membranes and biological re-growth and off-taste and odor occurring in the distribution system.
Diverse analytical methods have been developed for the characterization of DOM, mostly relying
on complex and lengthy procedures limiting real time information. In addition, most DOM
characterization methods include preparation steps, such as changes in pH, which may change the
DOM structure and conformation from its natural state. Rapid characterization of DOM and how it
evolves throughout treatment processes is needed to be able to modify treatment parameters as
needed to minimize the effects of DOM. PRAM (polarity rapid assessment method), fluorescence
EEM (excitation emission matrix) and HPLC-SEC (size exclusion chromatography) offer great
advantages for the continuous monitoring of DOM changes in treatment facilities with minimum
sample preparation steps. These techniques offer the advantage of providing information in short
periods of time. This paper assesses the changes in DOM polarity and size characteristics through
the water treatment process at the River Mountains Water Treatment Facility in Henderson, Nevada,
indicating the value of the approach. Initial data shows temporal variation in DOM polarity as well
as differences in the effects of ozone pretreatment as measured by the PRAM method. Size data
indicates minimum differences in molecular weight distributions. A pre-concentration step,
required prior to analysis of DOM size distribution, may be inhibiting the detection of differences in
molecular weight distributions. Fluorescence data show a reduction in the intensity of the fulvic
component between influent and finished waters. Includes 16 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 830 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 10 |
| Published : | 06/17/2005 |
