Normally a clarifier runs at one torque value for 90 – 98% of the time. The drive unit should be designed for this running torque and should protect from excessive loads that would require it to run above its design requirements. Optimum ratings for running, alarm, and shut-off should be specified for a clarifier drive unit based on the intended use of the clarifier.
Design of the various collection troughs have a direct bearing on both the process and the economic aspects of the water or wastewater treatment facility.
Side Water Depth (SWD) is critical when the design engineer is planning new clarification equipment or evaluating existing units. The application of the clarifier/settling tank has a lot to do with the selection of the side water depth.