AWWA ACE58196

AWWA ACE58196 Effects of Empty Bed Contact Time and Temperature on the Removal of Haloacetic Acids Using Biologically Active Carbon
Conference Proceeding by American Water Works Association, 06/15/2003

Wu, Hongwei; Xie, Yuefeng F.

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This laboratory scale study investigated effects of empty bed contact time (EBCT) and watertemperature on the removal of haloacetic acids (HAAs) in biologically active carbon (BAC)columns. EBCT and water temperature significantly affected the HAA removal in BAC columns.Increasing EBCT and water temperature increased the HAA removal. At 4C, the averageremoval efficiency for six HAAs was 28% at an EBCT of 5 minutes. By increasing the EBCT to10, 15, and 20 minutes, the average removal efficiencies increased to 55%, 69%, and 89%,respectively. At 10C, the average removal of six HAAs was 65%, 94%, 98%, and 99% forEBCTs of 5, 10, 15, and 20 minutes, respectively. When temperature increased to 20 and 30C,a nearly complete removal of HAAs in BAC columns even with an EBCT of 5 minutes wasobtained. Further increasing EBCT had little benefit on HAA removal. Kinetic models on HAAremoval at various EBCTs and temperatures were also explored. Includes 11 references, tables, figures.