Water scarcity, rising energy costs, and stricter regulations
on
disposal of industrial effluents have forced a focus on the water
usage in process plants. In this context, the development of methodologies
to analyze the possibility of water reuse in industrial processes,
considering the presence of multiple contaminants, has became an important
issue for process engineers. There are a great variety of methods
to deal with this problem, and they can be divided in two groups:
algorithmic methods and mathematical programming methods. The problem
with multiple contaminants becomes more complex, and the available
algorithmic procedures are sometimes cumbersome; the methodologies
based on mathematical programming present complex formulation and
solving algorithms. This paper presents an extension of the algorithmic
procedure water source diagram (WSD) to multiple contaminant processes.
The proposed extended WSD procedure synthesizes water mass exchange
networks for multiple contaminant processes, focusing on water reuse.
It also targets the minimum water consumption and simultaneously makes
the synthesis of the corresponding water network. The proposed procedure
was applied in different examples used in the literature by others
authors when discussing their proposals. Confrontation of results
shows that the methodology here proposed has very good performance.
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