Abstract
In larger sewage plants, motor-regulated overflow weirs are sometimes used to achieve a uniform flow distribution into the secondary settling tanks, backed up by simultaneous control of the immersion depth of the upstream aerating units. It is demonstrated that, if these overflow weirs are arranged in series on one side of the feed channel, they are unable, with a fixed setting, to ensure equal flow distribution when there is a variable inflow. If flowmeters are mounted in the discharge pipes, with feedback controls to the motor-regulated weirs, it is then possible to achieve equal flow distribution.
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