Bench‐scale evaluation of GAC for NOM control

Abstract

Although these authors confirm that the RSSCT is able to predict the breakthrough behavior of full‐scale activated carbon columns, they emphasize the importance of obtaining a representative batch water sample for the RSSCT.The Information Collection Rule (ICR) will require that some utilities perform disinfection by‐product (DBP) precursor removal studies. The rapid small‐scale column test (RSSCT), a bench‐scale granular activated carbon (GAC) test designed to reduce time and costs associated with field‐scale studies, has been proposed as an alternative to evaluate GAC performance for the ICR. RSSCT scaling equations maintain similitude with full‐scale GAC systems, and therefore the RSSCT directly assesses the concentration breakthrough in a full‐scale GAC column. A review of past studies shows that the RSSCT has successfully predicted field‐scale performance for the control of natural organic matter and DBP precursors. The results of a current study emphasize the importance of obtaining a representative batch water sample for the RSSCT. A cost analysis based on using GAC to satisfy stage 1 and stage 2 requirements of the Disinfectants/Disinfection Byproducts Rule suggests that minimizing empty bed contact time will reduce capital costs associated with GAC contactors.