An approximate mixed integer linear programming (MILP) model for the design of water reuse/recycle networks with minimum emergy

Raymond R. Tan, Dominic Chwan Yee Foo, D. K. S. Ng, Choon Lai Chiang, S. Hul, V. Ku-Pineda

Research output: Contribution to journalArticle

Abstract

Recent trends in process engineering have placed increased emphasis on the design of inherently clean and efficient processes. For example, a wide range of pinch analysis and mathematical programming methods have been developed for designing schemes for water reuse/recycle in industrial plants for both grassroot design and plant retrofit. In the latter case, the conventional approach is to maximize water recovery and thereby minimize fresh water demand and effluent volume. However, it is possible that with such an approach the reductions in environmental impact brought about by saving water can be offset by other impacts arising from increased use of energy and materials in the plant after retrofit. This work presents a model for minimizing the total resource consumption impact of a water reuse/recycle network. The total impact is expressed in terms of emergy - a measure of cumulative solar energy inputs into a life cycle system. A simplified model is proposed that focuses on the impact contributions of water, electrical power and material for capital goods. Two case studies illustrate the approach. Results show that the network with the lowest total impact can be found by sacrificing water recovery for savings in energy and material use.

Original languageEnglish
Pages (from-to)566-574
Number of pages9
JournalAsia-Pacific Journal of Chemical Engineering
Volume2
Issue number6
DOIs
Publication statusPublished - Nov 2007

Keywords

  • Emergy
  • Life cycle
  • Mixed integer linear programming
  • Water reuse/recycle networks

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Waste Management and Disposal

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