Five commercially available granular activated carbons
(GACs) and two background waters were used to
evaluate steady-state monochloramine reduction. Operation
at steady state is appealing because it eliminates
the need to replace or regenerate the filter media. Previous
studies had found that monochloramine-GAC
reactions reached steady state in fixed-bed reactors but
that impractically large contact times were required to
achieve low effluent concentrations at steady state
under drinking water conditions.
These experiments demonstrated that monochloramine
reduction is a function of GAC type and source
water characteristics such as pH and the presence of
natural organic matter. Furthermore, results indicated
that the more recently developed GACs, when combined
with practical contact times (5 to 8 minutes,
depending on pH), could generate water of sufficient
quality for use in kidney dialysis, which is currently
the most stringent application in terms of monochloramine
removal. Monochloramine reduction with
GAC could be used to facilitate trihalomethane cometabolism
in drinking water filters, providing utilities
with another tool to meet disinfection byproduct
regulations. Includes 17 references, tables, figures.
| Edition : | Vol. 99 - No. 7 |
| File Size : | 1
file
, 390 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 11 |
| Published : | 07/01/2007 |
