SPIRAL MEMBRANES REVERSE OSMOSIS
SPIRAL MEMBRANES REVERSE OSMOSIS
(OP)
Hi...
I am starting to work using R.O. Spiral membranes, I would like to understand when manufacturer provide information as 80 mil, 43 mil...what is exactly part of the membrane use to have this kind of measurement?
If I am intending to calculate filtration area have I to consider this number?
Please, feel free to comments and advise....
Thanks in advance,
Araujo
I am starting to work using R.O. Spiral membranes, I would like to understand when manufacturer provide information as 80 mil, 43 mil...what is exactly part of the membrane use to have this kind of measurement?
If I am intending to calculate filtration area have I to consider this number?
Please, feel free to comments and advise....
Thanks in advance,
Araujo





RE: SPIRAL MEMBRANES REVERSE OSMOSIS
ChemE, M.E. EIT
"The only constant in life is change." -Bruce Lee
RE: SPIRAL MEMBRANES REVERSE OSMOSIS
Thank you...I am gonna try this way.....
Sorry, I have a question about spiral membranes..usually
this is the layer configuration....Membrane/Feed Spacer/Membrane and between this some kind of plastic mesh...I saw a scheme in website Osmonics..
When I am using a Membrane 43 mil versus 80 mil..is it correct to predict 80 mil will show better flow performance?
According to your helpful information, it is possible to have a 43 mil and 80 mil with the same filtration area. is this measurements regarding to feed spacer? is this can be parallel or diamond? am I on the right way..
As I told before, I am a begginer...feel free to advise..
Araujo
RE: SPIRAL MEMBRANES REVERSE OSMOSIS
The thickness of the feed spacer, while important, is not the parameter of primary concern in designing an RO system. The thinner feed spacers allow the manufacturers to put more membrane area within the fixed 2.5, 4 or 8 inch standard cartridge diameters. Generally, the cartridges are 40" long though 1 manufacturer makes 60" long cartridges. This one also makes 17" dia X 60 long cartridges for very large systems.
The problem you encounter with thinner feed spacers is the feed must be very, very clean to minimize fouling of the feed spacer.
The more important parameter to look at is the membrane flux rate.
Hope this helps.
RE: SPIRAL MEMBRANES REVERSE OSMOSIS
a) Membrane Sheet/Feed Spacer Sheet/Membrane Sheet using epoxi glue...ok? Feed spacer in spiral wound stays betwen two membrane sheets, this Feed Spacer can be paralell or diamond, corrugated..ok? I do not understand, what is nomenclature for that "plastic" screen among layers?
I am a little bit confuse about these details....
Maybe I am complicating simple things...in Perry book I saw as 1 stack...for example: 1 membrane sheet==corrugated feed spacer===1 membrane sheet...usually only 3 sheets?
b) As you told....if I am using the same cartridge size...and if I am intending to compare filtration area 43 x 80 mil..it is expected a difference.
RE: SPIRAL MEMBRANES REVERSE OSMOSIS
ChemE, M.E. EIT
"The only constant in life is change." -Bruce Lee
RE: SPIRAL MEMBRANES REVERSE OSMOSIS
Only to be short...what is the sequence starck in a R.O. membrane...?
membrane...feed spacer....membrane??
In RO membranes there are, membrane; feed spacer; membrane; and mesh spacer?
Araujo
RE: SPIRAL MEMBRANES REVERSE OSMOSIS
Maybe this is not what you mean...
Salute,
fd74