AWWA WQTC59006

The results obtained during this study reinforced the potential of ozonation/biofiltration tocontrol organics, ozone byproducts (OBP) and chlorinated disinfection byproducts(DBP) formation precursors. A total of six halaoacetic acids (HAA6) and total trihalomethanes(TTHM) measured in the filters were in compliance with Stage 1 of theDisinfection Byproduct Rule. Most substrates were removed within 3 minutes of emptybed contact time (EBCT) and, in general, additional contact times contribute very little toenhance biofilter performance. Dissolved organic carbon (DOC) was removed up to30% and high removal of ozone byproducts was obtained in all filters (i.e., 65 to 84%),regardless of temperature regime. Implementation of second-stage ozonation resulted insignificant ozone savings while maintaining similar CT credit and biofilter performancethan first-stage biofiltration. Optimization of ozone oxidation placement in the treatmenttrain resulted in a reduction of 20% in applied ozone. Biomass and microbial activitymeasurements correlated well with filter performance. Filters operated at coldtemperatures performed as well as the ambient filters, after proper acclimation. Includes 10 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/02/2003

Number of Pages:

9

File Size:

1 file , 280 KB