RO System with Concentrate Recycle

In order to increase the total recovery and lower the overall rejection, we design RO systems with Double and triple stages where concentrate generated from one stage is feed again to reduce the total overall recovery.

A concentrate recycle setup can be utilized where a portion of the concentrate stream is fed back to the feed water to the first stage to help increase the system recovery.

Single Pass RO vs Double Pass RO

Think of a pass as a stand alone RO system. With this in mind, 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.