AWWA JAW64971 Journal AWWA - Monochloramine Destruction by GAC - Effect of Activated Carbon Type and Source Water Characteristics

Journal Article by American Water Works Association, 07/01/2007

Fairey, Julian L.; Speitel, Gerald E., Jr.; Katz, Lynn E.

Full Description

Five commercially available granular activated carbons(GACs) and two background waters were used toevaluate steady-state monochloramine reduction. Operationat steady state is appealing because it eliminatesthe need to replace or regenerate the filter media. Previousstudies had found that monochloramine-GACreactions reached steady state in fixed-bed reactors butthat impractically large contact times were required toachieve low effluent concentrations at steady stateunder drinking water conditions.These experiments demonstrated that monochloraminereduction is a function of GAC type and sourcewater characteristics such as pH and the presence ofnatural organic matter. Furthermore, results indicatedthat the more recently developed GACs, when combinedwith practical contact times (5 to 8 minutes,depending on pH), could generate water of sufficientquality for use in kidney dialysis, which is currentlythe most stringent application in terms of monochloramineremoval. Monochloramine reduction withGAC could be used to facilitate trihalomethane cometabolismin drinking water filters, providing utilitieswith another tool to meet disinfection byproductregulations. Includes 17 references, tables, figures.

Product Details

Edition: Vol. 99 - No. 7 Published: 07/01/2007 Number of Pages: 11 File Size: 1 file , 390 KB