The best available technologies for controlling disinfection by-products are enhanced coagulation/softening and granular activated carbon (GAC) adsorption for precursor removal. Little information is available on the GAC adsorption capacities for haloacetic acids (HAAs), and HAA removal in GAC filters has been incorrectly attributed to physical adsorption. In this research, laboratory and field studies systematically investigated the physical adsorption characteristics of HAAs onto GAC. Results indicated that HAA breakthrough can be observed within a short period of time (e.g., one to several months). In addition, HAA removal was observed after GAG saturation. The study concluded that GAG adsorption plays only a minor role in the beginning of the carbon filter run for HAA removal, and that HAA removal in aged GAG filters may be attributable to biodegradation. To better control HAAs in finished water, water providers should promote biological activity inside the filter rather than change the carbon frequently.
|Original language||English (US)|
|Journal||Journal of the American Water Works Association|
|State||Published - Jun 2006|
All Science Journal Classification (ASJC) codes
- Water Science and Technology
- Civil and Structural Engineering