Global optimization of wastewater integration networks for processes with multiple contaminants
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AbstractA formulation for the global optimization of recycle and reuse mass integration networks is presented. In addition to direct recycle, the model includes adding inplant interceptors and terminal treatment systems. The model also considers wastewater streams with multiple contaminants. Because of the nonlinear and nonconvex nature of the optimization model, a twotier approach is proposed along with a simplifying superstructure. First, a presynthesis problem is solved to identify the performance and cost of interceptors with specific tasks. Next, a representation that avoids the mixing of different streams in the treatment system is formulated. As a result, linear relationships on the mass balances are obtained, which implies that the model can be solved for global optimality. An application to a real case study of a refinery system is carried out. When compared to the original system and to the results provided by an integration based on a simple direct recycle strategy, the results show that significant reductions in fresh sources consumption and waste generated can be achieved with the application of the proposed integration framework. 2011 American Institute of Chemical Engineers Environ Prog, 2011
