Precautions Must Be Taken in UF Membrane Package, Transportation & Storage

Package & Transportation

• All outside-in membrane elements shall be packed separately. Membrane elements are packaged with a plastic film bag and then are placed in a solid board carton with shockproof and fixing measure after sealing. Violent impact and throw shall be avoided during loading and unloading;
• During the transportation, membrane elements shall be laid flat on the transport carrier with a maximum of 4 stacked layers. At the same time, they shall be protected from the sun and rain to prevent exposure and freezing;
• When leaving the factory, 1% sodium bisulfite solution shall be added to the membrane elements as storage solution.

Storage

• Unused new membrane element can be kept in the storage bag;
• UF membrane elements shall be placed in a dry, ventilated place with a temperature range of 5 °C to 40 °C, away from fire and heat sources and away from direct sunlight;
• Membrane elements are not allowed to be placed in a frozen environment;
• When placed or stored, the wet membranes are treated with an antimicrobial agent to prevent bacteria growing inside. UF membranes are resistant to general purpose biocides and antimicrobials;
• When the membrane requires a short term storage, use permeate (2.0 ppm active chlorine can be added) to flush the membrane for 30 to 60 minutes everyday to restrain bacterial growth;
• When the membrane requires a long term storage, the membrane elements must be thoroughly cleaned before sterilization. 1% sodium bisulfite solution is adopted for sterilization;
• When the membrane elements in the UF system are out-of-service for a short period (2–3 days), run the system for 30 to 60 minutes everyday to prevent bacterial contamination;
• When the membrane elements in the UF system are out-of-service for a long period (7 days and above), the membrane elements shall be thoroughly cleaned and then preservative is injected into the membrane elements. Check the pH value of the preservative every month.