AWWA MTC69693

The Town of Smyrna, Tennessee Water Treatment Plant experienced several challengesassociated with treating water from the J. Percy Priest Reservoir, including extended periods of diminished water quality during seasonal turnovers in the lake. During theseturnovers, elevated levels of hydrogen sulfide, carbon dioxide, iron and especially manganesehave proven problematic for the plant operators. There have been additional complaints about the elevated hardness and algae levels inherent in the reservoir. In addition tothese 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 atthe plant and meet the new drinking water standards, the Town considered adding lime softeningand microfiltration to the treatment plant unit processes. A pilot scale treatability study wasperformed between July 30 and October 12, 2007 to demonstrate the ability of these unitprocesses to improve water quality for the town. The results of the treatability study indicatethat 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 testingalso demonstrated that the proposed unit processes could sustain treatment for thesecontaminants 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 thetreatment process for reclamation, improving the water usage efficiency of the plant to levels inexcess of 99%. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2009

Number of Pages:

15

File Size:

1 file , 1.4 MB