The Town of Smyrna, Tennessee Water Treatment Plant experienced several challenges
associated with treating water from the J. Percy Priest Reservoir, including
extended periods of diminished water quality during seasonal turnovers in the lake. During these
turnovers, elevated levels of hydrogen sulfide, carbon dioxide, iron and especially manganese
have proven problematic for the plant operators. There have been additional complaints about the elevated hardness and algae levels inherent in the reservoir. In addition to
these issues, the plant faces more stringent regulations associated with the Microbial/
Disinfection Byproduct Rules (M/DBP).
In order to provide an effective and reliable means of alleviating the current issues experienced at
the plant and meet the new drinking water standards, the Town considered adding lime softening
and microfiltration to the treatment plant unit processes. A pilot scale treatability study was
performed between July 30 and October 12, 2007 to demonstrate the ability of these unit
processes to improve water quality for the town. The results of the treatability study indicate
that lime softening and microfiltration can provide improved removal of iron, manganese,
hardness and turbidity over the existing unit processes at the water treatment plant. The testing
also demonstrated that the proposed unit processes could sustain treatment for these
contaminants for extended periods of time during mechanical failures, unlike the current process.
Finally, the testing indicated that decant from a solids holding pond could be returned to the
treatment process for reclamation, improving the water usage efficiency of the plant to levels in
excess of 99%. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.4 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 15 |
| Published : | 11/01/2009 |
