Sartorius stedim Sartocon ECO Series, Руководство пользователя

Страница: 13 / 40

13 Start up of cassettes
2.5 Determining Clean Water Flux for Filter Cassettes (CWF)
The water flux test is an easy and non-destructive test that measures the ability
of water to pass through the membrane in a specific system setup. Residuals on the
membrane surface will impact water flux rates. Determining the water flux rate
enables the user to confirm the ability of a cleaning cycle to restore filtration rate of
the system. The water flux should be trended over time and evaluated for potential
membrane and system changes.
It cannot be used to assess the removal of preservative, cleaning or process residue.
Specific analytical techniques are required to quantify residues.
Determine a clean water flux
Proceed as follows:
1. Rinse new installed cassettes to remove preservatives.
2. Post use sanitization cassettes with 1 N Sodium hydroxide and neutralize.
3. Run the clean water flux with purified water as specified in the table below.
4. Measure retentate rate and permeate rate at constant temperature (20°C).
5. Trend the clean water flux and water flux and evaluate data for potential
membrane and system changes. The clean water flux is used as the base line value.
Any changes in water quality, applied pressure, temperature and viscosity,
system design and membrane will have an effect on water flux.
In systems containing more than one Sartocon
®
ECO, the interpretation can be
simplified by establishing a baseline for a given set of devices in a given system.
Flow path restriction may not allow performing the flux test with the above-
mentioned parameters. In that case a different test pressure should be used to
perform a water flux test. Once the parameters are defined they have to remain
constant during every test to assure accuracy.
System Pressure Examples for Water Flux Determination:
Cassette Design
Feed Pressure Retentate Permeate Pressure
valve open Pressure valve open
[psi|bar|kPa] [psi|bar|kPa] [psi|bar|kPa]
Sartocon ® Slice
and Slice 200
ECO Cassette
29|2|200 7|0.5|50 0|0|0
Sartocon ® ECO
Cassette 29|2|200 7|0.5|50 0|0|0
Multiple Sartocon ® 29|2|200 10–14|0.7–1|70–100
<
7|0.5|50
ECO Cassettes
or Sartocube
®
ECO