Questions regarding secondary reverse osmosis
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Why is concentrated water still produced after the fresh water from primary reverse osmosis goes through secondary reverse osmosis? Logically, in first-stage reverse osmosis, only water molecules that can pass through the membrane are retained, so why is there still concentrated water produced in the second stage?
The reverse osmosis membrane is related to pressure
First-stage reverse osmosis is also divided into stage 1 and stage 2; the feed water for stage 2 is the concentrated water from stage 1, following the same principle. I’m also a beginner; I hope the expert can provide a detailed explanation.
Isn’t the principle of secondary reverse osmosis the same as that of primary reverse osmosis? It’s just that the concentrated water from stage 1 cannot be recycled, but that from stage 2 can still be reused