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LX CEDI Modules
Page 22 IP-MAN-LX-1220-EN.pdf
· The maximum allowable LX water recovery depends on feed water concentrations of
silica and hardness, as shown in Table 5-2, below.
· 95% recovery may not be attainable below nominal product flow, because minimum
reject flow must be satisfied (see Table 5-1, above).
Table 5-2 Allowable LX Recovery (All LX Modules)
Hardness,
ppm as CaCO
3
Silica,
ppm as SiO
2
Recovery
%
≤ 0.2 ≤ 0.5 95
0.2 – 1.0 0.5 – 1.0 90
5.4.1. Example calculation of recovery
If LX30 product flow = 15 gpm and reject flow = 1.5 gpm
Then %R = (100)(Q
P
)/(Q
P
+ Q
R
) = (100)(15)/(15 + 1.5) = 90.9%
5.4.2. Example calculation of reject flow
If LX45 product flow = 5 m
3
/h and maximum allowable recovery = 90%
Then Q
R
= [(100)(Q
P
)/(%R)] - Q
P
= [(100)(5)/(90)] – 5 = 0.56 m
3
/h
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