Optimum water network design for multipurpose batch plants with an electrodialysis central regeneration unit

This paper presents a mathematical formulation for the simultaneous optimization of the production schedule and utility consumption of a multipurpose batch plant. The amount of wastewater generated is minimized through the exploration of direct, indirect, and regeneration reuse opportunities within the plant. Water regeneration is achieved through partial purification of highly contaminated wastewater using electrodialysis (ED). A design model for the ED process is included in the formulation in order to minimize the amount energy consumed by the regenerator simultaneously with the amount of water used by batch operations. The resultant model was applied to a case study and proved to significantly decrease the freshwater usage by up to 41 %, hence increasing the overall plant profit.

[1]  Thokozani Majozi,et al.  A mathematical optimisation approach for wastewater minimisation in multipurpose batch plants: Multiple contaminants , 2009, Comput. Chem. Eng..

[2]  Rajagopalan Srinivasan,et al.  Sequential methodology for integrated optimization of energy and water use during batch process scheduling , 2011, Comput. Chem. Eng..

[3]  R. Sargent,et al.  A general algorithm for short-term scheduling of batch operations */I , 1993 .

[4]  Lazaros G. Papageorgiou,et al.  Optimal design of an electrodialysis brackish water desalination plant , 2005 .

[5]  Wu Xiao,et al.  Simultaneous optimization of batch process schedules and water-allocation network , 2009, Comput. Chem. Eng..

[6]  Hong-Joo Lee,et al.  Designing of an electrodialysis desalination plant , 2002 .

[7]  Thokozani Majozi,et al.  A robust mathematical formulation for multipurpose batch plants , 2012 .

[8]  Cheng-Liang Chen,et al.  A Mathematical Model for Water Network Synthesis Involving Mixed Batch and Continuous Units , 2013 .

[9]  Thokozani Majozi,et al.  Wastewater minimisation using central reusable water storage in batch plants , 2005, Comput. Chem. Eng..

[10]  Luis Puigjaner,et al.  Optimisation of water use in batch process industries , 1999 .

[11]  Robin Smith,et al.  Automated Design of Discontinuous Water Systems , 2004 .

[12]  Thokozani Majozi,et al.  Wastewater minimization in multipurpose batch plants with a regeneration unit: Multiple contaminants , 2011, Comput. Chem. Eng..