Wastewater minimisation using central reusable water storage in batch plants

This paper presents a continuous-time mathematical formulation for freshwater and wastewater minimisation in multipurpose batch plants with and without a central reusable water storage facility. The minimisation of wastewater is achieved through the exploitation of recycle and reuse opportunities. A superstructure that entails all the possible recycle and reuse possibilities is used as the basis for the formulation. Initially, the formulation is based on a predefined schedule characterized by a priori specification of starting or finishing times. The formulation is then extended to embed wastewater minimisation within an established scheduling framework in which starting and finishing times become o o r y w g p ©