Since the dawn of modern wastewater treatment design, concrete has been a widely accepted material for use in treatment tanks for applications ranging from activated sludge processes to sequencing batch reactors and oxidation ditches. Concrete has been popular because it combines economy with relative durability. For applications that require extremely large (greater than 5 mgd) tanks to be constructed on site, the pourability of concrete makes it still a preferred way to go.
But for applications of 5 mgd and below, steel construction offers significant advantages over concrete; those benefits lead to lower operating and lifetime costs, regardless of the application.
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