Surface Loading Rate Surface Settling Rate and Surface Overflow Rate

The surface loading rate is the number of gallons of wastewater passing over 1 ft2 of tank per day. This can be used to compare actual conditions with design. Plant designs generally use a surface loading rate of 300 to 1200 gpd ft2. Other terms used synonymously with surface loading rate are surface settling rate and surface overflow rate. Surface Settling Rate (gpd ft2) -Flow (gpd)-2 (13.1) Problem A settling tank is 120 ft in diameter, and flow to the unit is 4.5 MGD. What is the surface...