A graphical method was applied to cost minimization in the waste stabilization pond subject to area, depth and efficiency constraints. The solution have the values of area, cost and depth at optimality. The paper also compared the optimal solutions for both plug-flow and completely-mixed flow models. Although the optimal depths for the design data considered was the same for the two models, the plug-flow model cost only one-fifth of that of completely-mixed flow model. The area occupied by the latter was found to be four times larger.
Water Air and Soil Pollution 09/1991; 59(3):299-309. DOI:10.1007/BF00211838