List the recommended design criteria for final clarifiers for an activated-sludge process with a design capacity of 20 mgd. Assuming four identical circular clarifiers, calculate the surface area, diameter, side-water depth, detention time, and weir loading based on an inboard weir channel. If the flow into each tank is 6.5 mgd (5.0 mgd plus 30% recirculation flow) and the suspended-solids concentration equals 2500 mg/l, calculate the solids loading. Is this solids loading satisfactory?
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