high temp on wash

[PATheron]

Last night I adjusted the high temp on my seprotech to 108 degrees F. Once it got there I let it keep running becouse the seprotech doesnt build its own heat. I just made sure the heating element was off. I checked it at midnight and it was 10 degrees over at 120 f. Does anyone know if it hurt the nf 270s to have that happen? I dont know how it happened but it did. What do you think Jerry? All still well? Just real clean membranes now? Theron

[tuckermtn]

Theron- glad you brought up washing NF 270s. Did you just use hot water to do your wash or did you ad any soap?

thanks-

eric

[802maple]

Last night I adjusted the high temp on my seprotech to 108 degrees F. Once it got there I let it keep running becouse the seprotech doesnt build its own heat. I just made sure the heating element was off. I checked it at midnight and it was 10 degrees over at 120 f. Does anyone know if it hurt the nf 270s to have that happen? I dont know how it happened but it did. What do you think Jerry? All still well? Just real clean membranes now? Theron

I don't think you hurt them, but I wouldn't do it to often. I know you have told me several times that the seprotech will not build heat in the wash cycle, but it doesn't make sense as to why it wouldn't build heat. The other machines that warm there wash water do so only by the friction of going through the pumps and it is doing the same thing. I believe this is what happened when it warmed up on you. You have to be careful when you put that 108 degree water to your membrane as it can shock it if you don't feather it in by blending it in slowly.
Just check your perm water the next time you use it and see what if any sugar is in it. Remember to check it for passage atleast 20 minutes after start up as most membranes pass a little sugar at first.

[danno]

Theron -

I don't have a high temp shut off on my RO and have gone above recommended temps by mistake. I have not seen any ill efffects.

[PATheron]

Eric- I used soap with the wash. I suspected that those membranes were passing sugar too becouse the perm was cloudy. So the other day I went out and took a quart jar sample out of the perm tank and boiled it down to an ounce. Thats a 32 to 1 reduction and tested it at .8 at the 32 to 1 reduction. Im thinking I figured Im passing a gallon of syrup every 2500 gallons or with running that ro on half my sap 20 gallons so far. Thats what Im guessing anyway but it was just a sample dipped out of a 1500 gallon perm tank so not super scientific but should give me an idea. Theron

[maple connection]

I think the membrane should be o.k. The max wash temp is 120 degrees. They tell everyone 110 degrees max so we can figure in alittle error. If you want to know if you passing sugar and you have a microwave put alittle permeate in a glass bowl and microwave it for a minute or two. You will see the sugar crystalize on the bottom of the bowl. I use a clear glass soup bowl. I was at a membrane facility today and they told me to alway do a coustic wash at 100 to 105 degrees and a rinse at 100 degrees. The warm water will loosen the sugar in the membrane better than cold water. And the key to doing your washes is to be at 11 on the ph for coustic. If it drops during a wash add more soap. If the water turns brown dump it and start over. Wow alot of info for a friendly visit.

[danno]

Does anybody do their rinse at 100 f. I wish, How do you get your permeate warm? That would be a pretty big heating element.

[maple connection]

Danno
That is the same thing I told the guy. It is hard to get warm water in the permeate tank. I do know of a few guys that run there hot water coming off of ther piggy backs or steamaways into the permeate tank but, in my case I don't have that so (cold water it is) or alittle hot water from the house will do!! in my case my R.O. is in my garage.