Recycle and Reuse Water Networks

This chapter describes a mathematical mode and its application to simultaneously optimize direct recycle-reuse networks together with wastewater treatment processes to satisfy environmental constraints. A disjunctive programming formulation is implemented to optimize the recycling/reusing of process streams to units and to optimize the performance of wastewater treatment units. The approach incorporates property-based constraints such as toxicity, ThOD, pH, color, and odor. The disjunctive programming is reformulated as a MINLP model that is used to minimize the total annual cost of the system, which includes the cost for the fresh sources, the piping cost for the process integration, and the waste stream treatment cost. An example problem is used to show the application of the proposed model