In the practice, a material balance will be carried out in a water purification equipment that
operates on the principle of reverse osmosis.
Prepare 10 L of a 500 ppm NaCl solution.
Place the solution in the container and turn on the pump to pass the solution through the
membrane. Allow the solution to run through the rejection until the system is "washed" and the
concentration is the same as the feed.
Maintain a constant pressure drop of 40 psia by closing the rejection flow valve (Take care at all
times that this pressure does not change).
Take a 10 mL sample of permeate and measure the time it takes to fill this sample.
Repeat the same process 15 more times.
Wash the system with distilled water, disconnecting the pump suction hose and placing it in a
container with distilled water. Wait for the rejection outlet conductivity to be the same as for
distilled water.
Reconnect the hose to the brine system.
Perform another run of 15 samples, but now at 60 psia.
Results to report
RESULTS TO REPORT
➤ Concentrations of the samples (WITH THE CONDUCTIVITY)
> Osmotic pressure (USE APPLEGATE EQUATION)
> Membrane permeance (Aw) in kg/s*m2*atm
Excel data and small word document with discussion of results and graphs
Notes:
APPLEGATE equation to find osmotic pressure (pi)
T-(K)
como un soluto separado)
x=1.127
suma demolaridades del soluto iónico o no iónico/ada ion funge
Para el del
Napl
propiedad do in membrana
JA-AF) diferencias de ancentracion
Ppdad de la membran
permen de la me
For NaCl use coefficient 2 for APPLEGATE (number of lons)
Example:
This is how to obtain the osmotic pressure for concentration fraction of 0.058 and 0.0005 assuming
that molar weight of salt is 58.5
Fig: 1