Graphical approach to minimum flowrate targeting for partitioning water pretreatment units

Raymond R. Tan*, Denny K. S. Ng, Dominic Chwan Yee Foo

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)


Pretreatment is often necessary when the fresh water available to industrial plants is impure, and when some processes are particularly sensitive to contaminants. Partitioning processes such as membrane separation units are often used for such applications. However, the use of pretreatment units adds to capital and operating costs for a water system. Hence, it is of interest to develop design procedures to minimize the cost for such system. This work presents a graphical pinch analysis approach for targeting minimum flowrate of partitioning water pretreatment systems in single component problem. The approach determines how product and reject streams from the treatment unit can be allocated, along with bypassed freshwater, to satisfy multiple process sinks with their respective flowrate and purity requirements. Hypothetical case studies are presented to illustrate the approach, and generalized design principles based on pinch analysis heuristics are drawn from the examples.

Original languageEnglish
Pages (from-to)393-402
Number of pages10
JournalChemical Engineering Research and Design
Issue number4
Publication statusPublished - Apr 2010


  • Partitioning process
  • Pinch analysis
  • Process integration
  • Targeting
  • Water pretreatment

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Chemistry(all)


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