Cleaning And Maintenance; Cleaning Methods; 10.1.1 Cleaning By Water Circulation; 10.1.2 Chemical Cleaning - Burkert T-CUT Manuel D'utilisation

10 CLEANING AND MAINTENANCE
Fouling of the membrane surface may result in a decline in the flow rate of the permeate. In most cases, the
coatings can be removed from the membrane and the permeate flow rate can be for the most part restored.
The cleaning procedure must take into consideration the type of fouling and the resilience of the module type in
question.
The ideal cleaning method should be determined by means of pre-trials. As an alternative to commercial
cleaning agents, the pH value can also be modified during the cleaning phase with the use of lyes or
acids.
Only use the cleaning agents recommended by us in Section "12 Recommended auxiliary materials". Please
contact our technical support service before using cleaning agents not listed in these operating instructions.
Cleaning is generally conducted under the stress limits of the module. Therefore, each cleaning activity reduces
the life of the module.
10.1 Cleaning Methods
10.1.1 Cleaning by Water Circulation
→
Flush residual process solution out of the pipelines and the module by rinsing with DI water and convey out of
the system via the concentrate outlet.
→
Switch off feed pump, drain system.
→
Fill feed tank with DI water.
→
Switch valves in the system so that concentrate and permeate are fed back into the feed tank (cleaning
mode).
→
Leave water to circulate in the system for approx. 20 min. An increased cross-flow rate and temperature will
improve the cleaning effect. However, the maximum permitted values for module inlet pressure and temper-
ature must not be exceeded.
→
Drain the system.
If cleaning with water does not produce the expected results, the system can then be chemically cleaned.
10.1.2 Chemical Cleaning
The system can be chemically cleaned once a week up to once a year depending on the raw water quality.
Chemical cleaning is always implemented under cross-flow conditions.
Different chemicals, such as acids, alkalis, oxidizing agents, enzymes or surfactants, are added to the cleaning
circuit.
The option of cross-flow cleaning prevents a gradual blockage of the membrane.
18
english
Type T-CUT
CleaningandMaintenance