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    Calculation of settling tank size

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    6.10) A final settling tank for a 2-million-gallon-per-day (2mgd) activated-sludge treatment plant it to be designed to have an average overflow rate of 800 g/day-ft^2. the tank needs to have a minimum detention time of 2.0 hr and to allow proper settling it must be at least 11 ft deep. If the tank is circular, what should its diameter and depth be?

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    Solution Preview

    Detention time is the volume of the cylinder divided by the outflow. The surface overflow rate is the influent flow divided by surface area. So you have two equations:
    t = V/Q
    Q = ...

    Solution Summary

    The solution determines the size needed for settling tank given flow rate and detention time.