Figure 7: Source and sink CC for SK1 (a) Follow the source ranking order
(b) Further freshwater reduction
The design methodology is repeated for SK3, and the Composite Curves are
stacked above SK1. Figure 8a first presents the source and sink CCs
before identifying the freshwater target for SK3. It is worth to be
noted that contaminant ’B’ is not constraining for SK3 if the sources
are arranged with ascending order of contaminant ’A’. After shifting the
source CC to the right, the Pinch occurs at the sink’s main limiting
contaminant ’A’, see Figure 8b. As the Pinch occurs at the main limiting
contaminant, there is no room to further reduce the freshwater target.
In this case, the total freshwater target for both SK1 and SK3 is 16.675
+ 13.258 = 29.933 t/h.