The system will be fully operational in October 2014.
Kruger, a subsidiary of Veolia Water Solutions & Technologies, was awarded a contract by the city of Lake Oswego, Ore., the managing partner for Lake Oswego-Tigard Water Supply Partnership. The partnership, formed in 2008 between the cities of Lake Oswego and Tigard, has embarked on a $250 million program to upgrade, upsize, and modernize Lake Oswego’s water supply system to meet the current and future water supply needs of these two Oregon communities.
A key program element is a 38 million gal per day (mgd) water treatment plant expansion in which a 2 x 20 mgd Actiflo system is to be installed. Actiflo is a high rate ballasted clarification process utilized to provide drinking water treatment. This installation features the first full-scale sludge waste volume reduction system or high concentration sludge (HCS) system in the U.S.
The HCS system features two individual concrete process trains capable of producing a total of 40 mgd of water. The effluent turbidity is guaranteed at or below 2 NTU while treating influent turbidities as high as 100 NTU. Each Actiflo train operates with a HCS system that provides greater than 50% sludge waste volume reduction. This substantial waste reduction allows for capital cost savings by reducing the amount of downstream residuals handling equipment. It also generates overall plant operating cost savings that will provide a relatively rapid return on investment for the owners.
This new installation will be fully operational in October 2014.