Where FFw,SKj is freshwater to sink ’j’ flowrate,
FSRi,SKj is source ’i’ to sink ’j’ flowrate,
FSKj is the sink ’j’ flowrate, CSRi is
the concentration of contaminant in source ’i’, CFw is
the concentration of contaminant in freshwater, and ZSKjis the concentration of contaminant in sink ’j’.
Figure 2a-b show examples of feasible source mixing. As long as the
final cumulative load of the source Composite Curve (CC) touches or is
below the endpoint (final cumulative load) of the sink CC, the maximum
quality limit of the sink is still fulfilled (Eq 2). This is in-line
with the concept of stream mixing. A dirtier source (higher gradient
line) can be mixed with a cleaner source (lower gradient line) to fulfil
the concentration or quality limit of the sink demand- Figure 2a. The
cumulative load of sources is located below a load of sink CC means that
the total allocated source streams have a lower concentration than the
maximum limit of sink’s concentration- Figure 2b. Figure 2c is the
example of infeasible source mixing as the cumulative load of the
sources is above the sink’s requirement. In this scenario, more
freshwater is needed by shifting the source CC to the right.