3M MEMBRANA Liqui-Cel, Инструкция по уборке

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12
Liqui-Cel
®
Membrane Contactors Cleaning Guidelines
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Table 5: Severe Fouling Procedure
Step Description / Flow Schematic Chemical Solution Time
1
Water flush/Once-through Filtered (10 micron) water 5 min
2
Wet-Out Membrane
Pressurize shell side up to the
max allowable operating
pressure for the contactor and
let liquid come out of lumen
ports Isopropanol (IPA) or 2-Propanol 15 min
– 2 hrs.
4
Alkaline wash / recirculate
2-5% w/w. caustic (NaOH or KOH) solution using filtered (10 micron)
water. Suggested temperature 86 ºF to 122 ºF (30 ºC to 50 ºC)
1 to 4 hrs.
5
Drain contactor
6
Acid rinse / recirculated
5% w/w citric, or 3% Nitric or phosphoric, or 3% hydrochloric or a
combination of 3% Nitric and 3% phosphoric acid solution or 3%
Nitric and 3% HCL using filtered (10 micron) water at ambient temp.
1 to 2 hrs.
7
Drain contactor
8
Water flush/Once-through 20 to 30 min
9
Drying
Inert gas is preferred. Clean, dry, oil free air can also be used. Do
not exceed 122 ºF (50 ºC) gas temperature when using air to dry
the contactors
See section VIII
10
Membrane Integrity Test See section IX
* Note that the air temperature should not exceed 30 ºC (86
º
F) in normal operations. Higher temperatures are only
recommended for short cleaning/drying cycles.
Illustration 1: Flow Schematic for Normal Biological Soil Removal
F
P
=
=
=
Flow Indicator
Pressure Gauge
Valve
P
Drain
P
Recirculation
Once-
through
Drain
F
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Filtered (10 micron) water
– ambient temperature. Flush until pH in
= pH out.
Once-through