SELECTED PROCESSES FOR REMOVING NOM - AN OVERVIEW

As a result of the anticipated Disinfectants/Disinfection By-product R ule, there has been increasing emphasis by the water industry on the r emoval of natural organic matter (NOM) from raw-water supplies. Three important NOM removal options are coagulation, granular activated carb on (GAC) adsorption, and membrane filtration. Of these three processes , coagulation is the most widely used in the water industry. But when coagulation cannot remove adequate concentrations of NOM so that disin fection by-products can be controlled, other treatment technologies su ch as GAC and nanofiltration may need to be used. Various aspects of e ach of these technologies are discussed.