Synthesis of water-using network with central reusable storage in batch processes

With predefined schedule, this paper presents a mathematical formulation for synthesis of water-using networks in batch plants with a central reservoir for targeting freshwater consumption. A superstructure that considers all water reuse/recycle possibilities is presented for modeling the time-dependent water-using network. The proposed superstructure-based representation for synthesis of batch water-using networks is formulated as a nonlinear program (NLP), if used water can be reused and recycled, and a mixed-integer nonlinear program (MINLP), when water recycle is prohibited. Typical representative examples are supplied to demonstrate the good expectation of proposed superstructure-based NLP and MINLP formulations. Supported by the results, the network superstructure and its design scheme can effectively accomplish the goal of unraveling design problem of the water-using network with central reservoir(s) in batch plants.