This paper briefly describes the construction of the City of Winnipeg ultraviolet
light (UV) reactor installation, and discusses the onsite validation activities and
performance testing ¿¿¿¿¿¿¿¿ the first time this has been carried out in Canada on a full-scale
operational installation.
The City of Winnipeg completed the
installation of a UV disinfection system at
its Deacon Booster Pumping Station in
December 2004. The currently unfiltered
raw water is chlorinated at the Shoal Lake
headworks before it flows to the Deacon
Reservoir. The water is chlorinated twice
more, and fluoride and orthophosphate
are added before the water is delivered to
customers. A new water treatment plant
(WTP), currently under design, will
minimize potential health risks, meet
consumer expectations, and comply with
increasingly stringent water quality
regulations. The UV facility has been installed ahead of construction of the new WTP to
minimize the risk posed by Cryptosporidium.
The UV facility was designed to meet current (unfiltered) and future (filtered) water quality
(i.e., UV transmittance [UVT]) and flow rates. The Calgon-supplied system consists of six
Sentinel 48-inch UV reactors and related control systems. Nine 21.6-kW lamps are provided
in each reactor in clusters of 3lamps each. Each reactor's capacity ranges from 82 MLD at the
unfiltered design UVT of 75 percent to 120 MLD at the filtered design UVT of 90 percent.
These capacities are based on a minimum UV dosage of 28 mJ/cm<sup>2</sup>, with a safety factor of
0.7 to allow for lamp ageing and some lamp fouling.
The onsite performance validation testing revealed that the UVT of the raw water was about
78 percent. The challenge microorganism was MS2 phage, and the UVT adjusting chemical
was Super Hume™ (potassium humate salts). The validation testing was completed
successfully on February 8, 2005, and the UV facility was recommended for acceptance by the
City. Includes tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.1 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 12 |
| Published : | 11/01/2005 |
