Formation of disinfection byproducts (DBPs) is a major concern
for drinking water utilities. The addition of ozone can
help minimize trihalomethane (THM) formation, but ozonation
converts nonbiodegradable organic matter to biodegradable
organic carbon, resulting in the formation of biodegradable
organic matter and the potential for bacterial regrowth in the
distribution system.
Ozonation in drinking water treatment is typically used in
combination with biofiltration. Yavich and Masten proposed and
investigated a different approach, ozonation in combination
with biological fluidized-bed treatment (FBT). This study was
conducted using a continuously operated ozonation-FBT system
with no pretreatment. Biofiltration and bench-scale ozonation
systems were also used to compare the biodegradation efficiency
of FBT and investigate the effect of ozonation on
biodegradation efficiency. Results indicated that the combined
ozonation-FBT process was effective in removing THM precursors
and reducing turbidity. According to preliminary cost estimates,
ozonation-FBT may be a practical and cost-effective
alternative to conventional coagulation processes that require
additional steps to control DBPs.
For small water providers, the process represents a new option
for reducing DBP and regrowth potential. Because of the system's
small footprint and lack of sludge production, the ozonation-FBT
process is also applicable for larger utilities with limited space for
retrofitting or expansion. Includes 42 references, tables, figures.
| Edition : | Vol. 95 - No. 4 |
| File Size : | 1
file
, 280 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 13 |
| Published : | 04/01/2003 |
