Understanding the difference between passes
and stages in a Reverse Osmosis (RO) system
The terms stage and pass are often
mistaken for the same thing in an RO system and can be confusing terminology
for an RO operator. It is important to understand the differnce between a 1 and
2 stage RO and a 1 and 2 pass RO.
DIFFERENCE BETWEEN A 1 AND 2 STAGE RO SYSTEM
In a one stage RO system, the feed
water enters the RO system as one stream and exits the RO as either concentrate
or permeate water.
In a two-stage system the concentrate
(or reject) from the first stage then becomes the feed water to the second
stage. The permeate water is collected from the first stage is combined with
permeate water from the second stage. Additional stages increase the recovery
from the system.
Ro Membrane One Two Stage
ARRAY
In a Reverse Osmosis System an array
describes the physical arrangement of the pressure vessels in a 2 stage system.
Pressure vessels contain RO membranes (usually from 1 to 6 RO membranes are in
a pressure vessel). Each stage can have a certain amount of pressure vessels
with RO membranes. The reject of each stage then becomes the feed stream for
the next successive stage. The 2 stage RO system displayed on the previous page
is a 2:1 array which means that the concentrate (or reject) of the first 2 RO
vessels is fed to the next 1 vessel.
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RO Water Purifier Sales and Service.
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