Red Creek-Quote:
Originally Posted by RedMapleCreek
So you used two of these if I am reading your post correct. One telling you flow into the micron filter and one to slow the permeate flow instead of the brass needle valve.
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Red Creek-Quote:
Originally Posted by RedMapleCreek
So you used two of these if I am reading your post correct. One telling you flow into the micron filter and one to slow the permeate flow instead of the brass needle valve.
No, the RO always has the controlling needle valve on the concentrate stream, not the permeate stream. I put a pressure gage upstream of the 5 micron filter to see what the typical operating pressure was when the system was running at 50% water removal (it runs between 80 and 90 psi). I put a flow meter on the permeate output line with its needle valve wide open (simply to measure permeate flow). I put the other flow meter on the concentrate output line with its needle valve adjusted to build pressure and force water thru the RO membranes (this needle valve replaced the one that came with the RO Bucket). You can then adjust that needle valve to get a balanced flow between concentrate and permeate, thereby removing 50 percent of the water. This type of flow meter is calibrated for water (specific gravity of 1.0), and the concentrate will have a slightly higher s.g.. Therefor to achieve equal flow the concentrate meter reading needs to be slightly higher than the permeate meter reading since the higher density fluid will lift the indicator weight higher for a given flow.Quote:
Originally Posted by Greenthumb
I got a RO bucket this year as will and like it. I added a second membrane to pull more water out. Still learning but I think I was pulling 5 gallons out in 50 minutes.
Looks like RedMapleCreek and I had the same though process - I too have an RB-15 and added the same flow meters and what a difference in helping you fine tune. The unit works (probably quite well if you have low sugar) but I needed to modify it heavily for our application. Our sugar averages around 3.4 and at times is over 4 -- for most thats what they are seeing after they've already been through their Hobby RO once. I was quickly fouling the membranes due to not enough flow/pressure. There was very little permeate flow and closing down the needle valve to make more restriction did create more permeate initially, but the lower flow quickly fouled the membranes, lowering the concentrate flow to the point it wasn't worth it. I moved the membranes from parallel into series and added an additional 35PSI of head pressure pre-5 Micron filter, and the boost pump after, adding another 70psi (Did it this way because the pre-filter housing is only rated at 70PSI). Pre modifications, I was processing at about 2.3GPH 50/50 (Sugar from 3.4 to 6.8, 1.15GPH permeate /1.15GPH concentrate). Post modifications I am up around 8.5GPH 50/50. Also, previously I tried warming the sap to 50 degrees to try and increase the flow, which did help to an extent (too warm also appears to foul the membranes quicker, partially because warm sap can start generating bacteria), but with the sap now warmed up, boiling post RO was necessary. Post modifications I am running 36 degree sap, which is preferred because I can store the concentrate longer before needing to boil.Quote:
Originally Posted by RedMapleCreek
Thank for the reply and modification ideas. I guess what im looking to do is take our 1.85% ( yearly average) to 6-8% in a single pass. That way I could boil as I RO. Maybe I should look into a home biuld instead of thd RO bucket, maybe I need a 4x40 that then the concentrate runs into a 2.5x21 to get to the 6-8% in a single pass.Quote:
Originally Posted by Msboucha
You could start with the kit, but you would need to modify it in my experience. I can't say for sure, but based on what I am now able to do with my sugar levels, I would say moving the membranes into series (less GPH processed, but higher end sugar), adding an inline recirculation (concentrate is piped back to the pump with a flow restrictor), adding additional pressure ahead of the booster, adding a pressure gauge and some in-line flow meters for better visuals on your flow, you could probably get you close to what you are looking for. I don't doubt some of the flow claims for the bucket, I know others on here are getting good flow "out of the box", but when you start pushing higher sugar levels, more flow/pressure is definitely needed to not only prevent membrane fouling but to make it time efficient. Running off-grid, I couldn't afford to continue processing at a rate of 2.3GPH and leave it overnight like lots of people do, I'd chew through my battery storage, and since it could dip into freezing overnight, I needed to be able to get it back home. If you have the luxury of 110v power, you could get a large pump and really drive the flow, I just needed to stay in 24VDC and this fit the bill.Quote:
Originally Posted by Jolly Acres Farm
Do you flush the membranes after a run? What do you do between runs, let sap sit in the ro?
Go to 1st post on this, there is a link with basic operation
Jolly Acres,
I looked at the RO Bucket deal, but decided to build my own following Hodor's plan. (https://sites.google.com/site/mattat...osmosis-system)
Couldn't be happier with the results. Spent about $350. in various parts....a few hours to put together.....and the outcome is spectacular for my low budget operation.
I routinely run 1.9-2.0% sap through, and in one pass bring it to 8-8-1/2% !! When brand new with the four 150 R.O. filters, I saw 9% on a single pass.
Highly recommend you look at this based on your stated goal above.
I wanted to let you know that I ordered the RB 15 assembled bucket a couple weeks ago and was pleasantly surprised when I saw that it is plumbed in series and not parallel!
Furthermore, he’s contemplating further improvements for those of us who have a higher sugar content to start with.
I’m getting excited!