Researchers have recommended application of ozonation and
biofiltration to aid coagulation in removing disinfection byproduct
(DBP) precursors, but data on the efficacy of such
combined processes have been limited. This study was conducted
to investigate the effectiveness of combined processes, and
variations on them, using a raw water with high alkalinity and
low total organic carbon (TOC).
The authors evaluated nine treatment simulations, all incorporating
coagulation, ozonation, and biofiltration in the treatment
train. Variations in the treatment trains studied included the point
of ozonation with respect to coagulation, the ozone dosage
required for various disinfection objectives, the pH of coagulation,
ozonation, and biofiltration, and the type of biofiltration media.
According to the data, the combination of ozonation, coagulation,
and biofiltration proved successful in significantly reducing trihalomethane
and haloacetic acid formation potential. The point of
ozonation did not affect the overall treatment of water with low
TOC and high alkalinity. In addition, study results supported previous
work by showing the correlation between the reduction of DBP
formation potential and the reduction of ultraviolet absorbance.
These findings should help water utilities better understand
how ozonation and biofiltration can be coupled with coagulation
to comply with requirements of the Disinfectants/Disinfection Byproducts Rule. In addition to yielding a significant quantity of data,
the work also provided a protocol for future research with similar
objectives. This study is the first part of a larger project examining
the effectiveness of coagulation, ozonation, and biofiltration using
waters with different water quality characteristics. Includes 32 references, tables, figures.
| Edition : | Vol. 94 - No. 12 |
| File Size : | 1
file
, 380 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 15 |
| Published : | 12/01/2002 |
