AWWA ACE58293

Natural organic matter (NOM) has been shown to form undesirable disinfection byproducts(DBPs). Since the US Environmental Protection Agency (USEPA) promulgated the Stage 1 disinfection byproducts rule(Stage 1 DBPR) in 1998, the removal of NOM, as a DBP precursor, has been regulatedby enhanced coagulation. The MIEX¿ DOC resin targets the removal of anionicconstituents of NOM by exchanging the sites between anionic functional groups (e.g.,carboxylic acids) and chloride ion (Cl-). This research has focused on characterization ofMIEX adsorption of NOM isolates and bulk NOM from natural waters. An enhancedcoagulation matrix (source waters with varying total organic carbon (TOC) and alkalinity) was used as aframework for identifying and selecting natural waters from around the U.S. In all cases,based on XAD 8/4 resin fractionation of raw and MIEX treated waters, effectiveremovals of hydrophobic, transphilic, and hydrophilic NOM acids were observed. Theremovals of transphilic and hydrophilic (low molecular weight) acids are noteworthy,given the ineffectiveness of coagulation in removing these polar NOM fractions. Includes 4 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

06/15/2003

Number of Pages:

11

File Size:

1 file , 970 KB