thread136-211270
The fluid dynamics in a membrane module using feed spacers is very complicated. It is important to understand how the feed spacer is used. A misconception is that a feed spacer is a turbulence promotor. Without a feed spacer, the spiral membrane would not be able to operate, it...
thread136-184002
A very simple way to control the production of a membrane and will work very well in a ceramic membrane system is to use a positive replacement pump as discharge mechanism in your membrane system. Just set your desired rotations of the lobe pump, giving you the desired permeate...
Pore fouling is a direct result of a too low crossflow velocity. When the crossflow velocity is too low, macro-molucules have a tendency to be forced into the pores. If the delta PTM get higher, the crossflow velocity needs to be increased to prevent this action. This is why in MF there needs to...
Hey ports394 and herve
Depending on the type of membrane that you are using, a higher delta PTM can give either more or less permeate. In MF the max delta P I would stay under is 0.5-1.0 bar, in UF 1 - 10 bar and in RO it is really not very relevant.
In MF the crossflow should be very high...
Hello madchemist11.
The RO of milk is a common application, and has been applied for many years in the dairy industry. One needs to use the appropriate system design as well as the right sanitary membrane design.
Please bear in mind that the membranes need to be cleaned every 10 hours, and...
Constant pressure in membrane technology is a complicated matter.
Even when you use a back pressure on the membrane, the pressure differential over the concentrate will still create a pressure difference at various places in the membrane module, hence there is no constant transmembrane pressure...
