Storage of UF Membrane Module (Manual)

May 28, 2021

                                   



Follow the instruction below when you store the modules.
 
  • Be sure to wear protective gloves to avoid injury of hands by packing box of the modules.
 

1.    Storage of New Membrane Modules


Keep the modules in the original packing in a dark and cool place (0 to 40 degree
 C). Avoid direct sunlight and moisture.
 

2.    Storage of Membrane Modules after use


(1)    Short term, or temporary, shutdown or storage
In the case of the suspension of operation for less than four days, stop the feed water and keep modules full of water.  Keep the modules at 0 to 40 degree C.
If the suspension lasts for four days to less than eight days, fill the module with the chemical described in Table 1.  Use filtrate quality water.  Keep the modules at 0 to 40 degree C.

Table 1  Conditions for storing membrane modules for less than eight days
Maximum Storage Period Chemical Concentration of the Chemical
7 days Sodium hypochlorite 20 mg/L as chlorine
 
(2)    Long term storage
First carry out a chemical cleaning with sodium hypochlorite.  Fill the module with the chemical described in Table 2.  Use filtrate quality water.  Follow the instructions shown in Table 2.
Keep the modules sealed with the aqueous chemical solution shown in Table 1 or Table 2.  If removing modules from the system, seal them and store out of direct sunlight.  Keep the modules at 0 to 40 degree C.

Table 2  Conditions for storing membrane modules for more than seven days
Storage Period Preservative Chemical Concentration of the Chemical
More than 7 days Sodium bisulfite 1,000 mg/L
 
  • Rinse the module thoroughly with clean water after the chemical cleaning with sodium hypochlorite, and fill the module with sodium bisulfite solution.  Toxic chlorine gas is generated in the case of mixing sodium hypochlorite with sodium bisulfite without first flushing with water.



3.    Replace Preservative Chemical


Check the pH value of sodium bisulfite solution as the preservative and replace the chemical if the pH is below three (3.0).  Sodium bisulfite solution with a pH of 3 - 6 is active for the preservation.  Sodium bisulfite reacts with oxygen and forms sulfuric acid which results in a lower pH.
                                   

[Notice]
Unauthorized use or reproduction of this manual is forbidden.

This Instruction Manual does not intend to guarantee the results of application of the information provided herein or the safety and the compatibility of this product.
Before using this product, the user is asked to check for its safety and compatibility with the intended purpose.
The content of this Instruction Manual is subject to revision from time to time. 
Unauthorized use or reproduction of this manual is forbidden.

[Remarks]
This content is extracted from “TORAY Pressurized PVDF Hollow Fiber Membrane Module Instruction Manual”. Please refer to other contents stated in manuals.  
TORAY MEMBRANE MANUALS