Comprehensive Optimization for Multi-contaminant Wastewater Process Integration Networks

A convex mathematical programming model for the optimization of recycle/reuse water networks is presented in this chapter. The main configurations of interest, including segregation, mixing, recycling, bypass, and stream treatment, which are required to meet process and environmental restrictions, are included in the generic superstructure that forms the basis of the model. The concept behind the model formulation is to treat the individual flowrates as optimization variables and consider component balances. The bilinear terms that arise when the compositions and total flowrates are considered as optimization variables are avoided in this formulation. The objective function is to minimize the annual total cost, which includes the expenditures of the treatment unit, the pipeline, and fresh water. The proposed paradigm is demonstrated to be applicable by solving four illustrative problems.