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Des Moines Metropolitan
Wastewater Reclamation Authority
3000 Vandalia Road
Des Moines, IA 50317
515-323-8000

Preliminary Treatment

Back to Plant Processes

The flow enters the plant and pass through five bar screens. As the sewage passes through the bar screen, large items (i.e. rags, sticks, paper, etc.) are caught. These bars are mechanically cleaned and the debris is carried up to the first floor. The screenings can be diverted to either a conveyor or a dumpster.  After screening, the influent wastewater enters a wet well. Here, six centrifugal pumps, each driven by a 700 horsepower motor, lift the sewage 54 feet into a channel and a parshall flume where the flow is measured. Four of these pumps are variable speed, two are constant speed. Each is capable of pumping 38,192 gpm.