AWWA ACE61823

City of Wetaskiwin (Alberta, Canada, population 11,200) obtains its water supply from Coal Lake, ahyper-eutrophic water body. Coal Lake contains high levels of microcystin, a harmful toxinreleased by cyanobacteria (0.07 to 14.8 µg/L) and high dissolved organic levels (as high as 49mg/L). The treatment plant is continuously challenged by zooplankton, especially Copepodnauplii. In recognition of the algal concerns and the need to address more stringent particulateremoval standards in the future, the City of Wetaskiwin embarked on a proactive program toidentify plant improvement requirements. Dissolved Air Flotation (DAF) and membranetechnologies were selected as candidate processes for further piloting. The DAF process workedwell in this application and performed significantly better than the existing Pulsator clarifiers forlate-season (Fall) algae removal. However, the DAF did not perform significantly better than theexisting Pulsator clarifiers in the removal of color, turbidity, organic material and early-season(Spring) algae. Membrane filtration was extremely effective in removal of turbidity, particlecounts, algae and zooplankton. This paper reviews the water treatment upgrade programundertaken, and how the study findings were used to chart an upgrade path that addressesWetaskiwin's water quality and production needs. Includes 4 references, tables, figures.

Product Details

Edition:

Vol. - No.

Published:

06/17/2005

Number of Pages:

15

File Size:

1 file , 1.3 MB