1.1.10 Salt (Ionic) Passage; 1.1.11 Recovery; 1.1.12 Salt (Ionic) Rejection; Principles Of Operation - GE 000 gpd Operation And Maintenance Manual

C =
f
C =
p
C =
c
C =
avg

1.1.10 Salt (Ionic) Passage

Ionic Salt Passage equals the percent of dissolved salts passed through the mem-
brane element or 100% minus rejection.

1.1.11 Recovery

Recovery equals permeate rate divided by feed rate and is expressed as a per-
centage. For example, 75% recovery means that out of a given feed rate, 75% is
produced as purified water (permeate).

1.1.12 Salt (Ionic) Rejection

Ionic Salt Rejection equals the percent of dissolved salt rejected by the membrane
element, calculated from an average concentration over the membrane element.
An example of how to calculate salt rejection and recovery is below:
Given the system case in Figure 1.3:
Average Concentration (C
Feed Concentration
Permeate Concentration
Concentrate Concentration
Average Concentration in Machine
Figure 1.3

Principles of Operation

) = [(C
avg
= [(100 mg/L) + (375 mg/L)]
= 237.5 mg/L
3
) + (C )]
f c
2
2