AWWA ACE54468

This study examined ozonation and filtration conditions to address taste and odor episodes experienced by the Town of Gilbert, Arizona, water treatment plant. The study also aimed to improve compliance with increasingly stringent regulations. During the study, the main raw water odor-causing compound was methylisoborneol, which is associated with a musty odor. Ozone alone could not reduce all odors under all conditions to acceptable levels. Of the biologically active filters tested, granular activated carbon (GAC) filtration had the best performance for eliminating taste and odors. In order to limit bromate formation to less than 5 ug/L, Cryptosporidium ozone disinfection was limited to 1-log inactivation. Under all conditions investigated, ozonation resulted in significant reductions in trihalomethanes compared to conventional treatment. The biologically active filters provided increased removal of organics and disinfection byproduct precursors. Biological GAC filtration provided the best performance in terms of turbidity removal and disinfection byproduct precursor removal. At the conclusion of the study, it was recommended to include ozonation and GAC filtration facilities in Gilbert's full-scale treatment plant. Includes 8 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

06/01/2001

Number of Pages:

17

File Size:

1 file , 1.2 MB