Sand filtration vs. membrane filtration is not necessarily an ?out with the old and in with the new?. Comparing a unique combination of the oldest and the newest filtration technologies operated side by side and discovering that employing two very different treatment processes is actually advantageous, not a burden. At the North Clackamas County...

n 1999 North Clackamas went on line with 10 MGD slow sand filtration. In 2005 10 MGD of submerged membrane filtration was added to increase capacity and to help when high raw turbidity occurs. This presentation will cover how the two very different processes compliment each others strengths and weaknesses....