Reverse Osmosis stage vs pass
The term “stage” and “pass” are often wrongly confused as the same thing. It is important to understand the difference between a 1 and 2 stage RO and 1 and 2 pass RO.
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.
Figure 12 – 1 stage RO system
In a two-stage RO system, the concentrate from the first stage becomes the feed water to the second stage. The permeate water that is collected from the first stage is combined with the permeate from the second stages. Additional stages increase the recovery of the system.
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Figure 13 – 2 stage RO system
A “pass” shall be seen as a stand alone RO system . The difference between a single pass RO system and a double pass RO system is that with a double pass RO, the permeate from the first pass becomes the feed water to the second pass (or second RO) which ends up producing a much higher quality permeate because it has essentially gone through two RO systems.
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Figure 14 – single pass RO
Lenntech will design the full Reverse osmosis water treatment plant according to your feed water quality and product requirements. Passes and Stages will be applied when needed.
Lenntech provides sustainable and complete solutions with RO technology, integrating it with the pre-treatment and post treatment necessary.
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