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Des Moines Metropolitan
Wastewater Reclamation Authority
3000 Vandalia Road
Des Moines, IA 50317

Primary Treatment

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Each primary is 130 feet in diameter and approximately 12 feet deep. Each holds 1.19 million gallons. Generally, a retention time of 1 to 2 hours is maintained, allowing the scum to float to the surface where it is removed by a skimmer.