Determine the surface area required for the gravity thickeners of Problem 20-10 if 710 m...

Determine the surface area required for the gravity thickeners of Problem 20-10 if 710 m³/d of primary sludge is mixed with the WAS to form a sludge having 2% solids. The final sludge is to have a solids concentration of 5%. The batch settling curve for mixed WAS and PS in Figure P-20-10 is assumed to apply. Because of the additional sludge, assume five thickeners will be used. Use a spreadsheet program you have written to plot the data and fit the tangent line.