MF/UF membrane filtration and constant flux
MF/UF membrane filtration and constant flux
(OP)
I have designed the small module of MF hollow fibre membranes to test the mixture of pretreated protein solutions. The aim is just to see how quickly those membranes are fouled, however, my design for constant flux filtration is not quite right. I'm using low flow FMI pump, and pressure affects the flow a lot.
I'm thinking to doing backpressure to compensate, but I'd like to know has anyone had better idea for my set up?
I'm thinking to doing backpressure to compensate, but I'd like to know has anyone had better idea for my set up?





RE: MF/UF membrane filtration and constant flux
RE: MF/UF membrane filtration and constant flux
As I have mentioned, I think my set up is not quite right. I collected the permeate volume every 24 hours, and then I calculated the flux based on the cumulative filtration time. I also recorded the initial flux at the very beginning of the run. I always found that as feed pressure increases within 24 hours, there's a decline in flux. Flux values are more or less the same after 24 hours. Would you have any idea for my set up to be improved?
RE: MF/UF membrane filtration and constant flux
RE: MF/UF membrane filtration and constant flux
RE: MF/UF membrane filtration and constant flux
I guess if you are monitoring fouling, your dependant should be flux?
RE: MF/UF membrane filtration and constant flux
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.
If the crossflow velocity is not enough different fouling will happen in the membrane which will than affect the separation and flux and so on, I guess one can understand the escalation. To obtain a real constant delta P transmembrane is a complicated process.
I have calculated the capacity improvements and they are substantial.
It requires however a new approach to the membrane module designs. This will come at an additional cost and not all membrane configurations can be used for this type of approach. What applications are you thinking off?
RE: MF/UF membrane filtration and constant flux
RE: MF/UF membrane filtration and constant flux