Ro connections

[cat tech]

Many of the drawings that I see for multi membrane set up ro units have the out put from one canister to the inlet to the next housings . I’m wondering what’s the plus and negatives of series or parallel connections?? This is going be my first ro set up and I’m almost certain that my 3 -400 gpd set is going be undersized. I’ll be looking at how to remove as much water as possible from a bulk tank and not as much worried about getting crazy high sugar %.


Thank you everyone as always for your advice

[amasonry]

cat tech
"I’ll be looking at how to remove as much water as possible from a bulk tank and not as much worried about getting crazy high sugar %."

as you remove the water the sugar content will rise. parallel connections will remove say half the water in one pass taking 2% to 4%. but to get more water out you would have to run the concentrate again. membranes in a series, each membrane takes out more water. so in one pass, you could take three-quarters of the water out. making your 2% to 6-8%. just an example

[DRoseum]

amasonry is correct. Remember also that volumetric flow rate of the concentrate and permeate are each half of the input. That said, if you do a series set up, you do not need all the same gpd ratings. You can effectively cut those in half for each additional membrane. So 400 --> 200 --> 100.

Conversely, if you were to run 2 of the 400 gpd membranes in parallel, combine their outputs into your 3rd membrane you would be fully utilizing each of their 400 gpd flow ratings. This is known as a 2 stage set up and it's very effective.

RO_Membrane_One_Two_Stage.jpg

[cat tech]

That’s a great suggestion d. Roseum, 2 membranes in parallel feeding my last membrane in series . Sound like a perfect way to get the best out of the equipment I have on hand .

Thank you