# The flocculation process in one treatment train at a surface water treatment plant is to be...

The flocculation process in one treatment train at a surface water treatment plant is to be designed to treat a flow rate of 12 ML/d with a hydraulic detention time of 30 minutes. The flocculation basin should be divided into 4 equally sized stages with successively lower velocity gradients in each stage (that is, tapered flocculation). The velocity gradients in stages 1, 2, 3, and 4 should be 80, 65, 50, and 35 s−1, respectively. The water temperature is 15°C.

(1) Calculate the volume of the flocculation basin, the volume of each stage, and the power required for the flocculator in each stage.

(2) Determine the length, width, and depth of the stage, the diameter of the impeller using a 3-bladed hydrofoil, and the rotational speed.

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