rev.1.1 Page 10-19
x100%
FlowOutlet Electrode+Blee
eConcentrat +Product Dilute
FlowProduct Dilute
=Recovery
Therefore,
FlowProduct Dilute - FlowOutlet Electode100x
Recovery
FlowProduct Dilute
= Flow Bleed eConcentrat −
Example
For a system with <0.1 ppm of hardness in the feed water, 25 gpm Dilute Product flow and
0.5 gpm Electrode Outlet flow, what is the minimum Bleed flow rate?
Concentrate Bleed Flow =
25
95
x100
−−05 25.
Therefore the minimum Concentrate Bleed Flow = 0.8 gpm
The Concentrate Bleed is usually higher quality than the RO feed water, so it is usually
recycled to the RO inlet. This improves the overall E-Cell System™ recovery to about 98%.
10.1.4 Electrode Stream
Range 0.25-0.40 gpm (60-90 l/h)
The Electrode stream flows over the electrodes. This stream cools the electrodes and
removes any gases produced in the chambers. Due to the presence of H
2
, O
2
and possibly
Cl
2
gas in this stream, it must be sent to a vented drain.
Some of the Cl
2
gas will dissolve into the solution. The presence of oxidants, combined with
the venting requirements and the small flow rate, lead to this stream flowing to drain in most
installations, rather than being recovered.
The Electrode stream is supplied from the Concentrate stream.
10.2 OPERATING PRESSURES
The Concentrate stream must always operate at a lower pressure than the Dilute stream to
maintain high product water quality.
The Concentrate inlet must be at least 5 psi (0.3 bar) less than the Dilute inlet pressure. The
Concentrate outlet must be at least 5 psi (0.3 bar) less than the Dilute outlet pressure.
The Concentrate Inlet valve controls the inlet pressure difference. Closing the valve
decreases the Concentrate Inlet pressure and thereby increases the pressure difference
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