This paper focuses on water treatment plant design, specifically how innovative process and
hydraulic design translates into real world conditions at operating facilities. Data
presented here compares original design values with field measurements and operational
data. Treatment performance of the new facility is quantified and compared to the
original plant.
The new 150-million-gallon-per-day (mgd) Scott Candler Water Treatment Plant
(SCWTP), located in the Atlanta metropolitan area, is one of the largest and most
sophisticated facilities in the southeastern United States. The new plant replaced the
original 128-mgd conventional surface water treatment plant, first built in 1942 and
expanded eight times afterward.
During planning and preliminary design, DeKalb County staff recognized the need for
additional treatment barriers and reduced disinfection byproduct (DBP) concentrations.
To accomplish these goals, a combination of advanced treatment techniques and proven
technology were selected including high-rate sedimentation, ozonation, and deep-bed
biological filtration. The new facility was designed to achieve current and future
regulatory requirements, and to meet high standards for reliability and risk-based
redundancies.
Since full scale production began in July 2007, the SCWTP has been meeting or
exceeding treatment and process goals set during design phase. Settled water turbidities
have been reduced. TOC removal within the treatment process has increased. DBP
levels in the distribution system have been reduced.
In addition to notable process design for the new plant, the hydraulic design includes
several unique features. The intermediate ozone facility includes six contactors, three on
either side of a central gallery, with each side having a tapered inlet channel to aid in
flow distribution. The contactors are also equipped with an innovative design feature to
turn inlet flow downward toward the ozone diffusers located at the bottom of the first
cell. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 2.4 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 12 |
| Published : | 11/01/2008 |
