Method for repairing and modifying waste reverse osmosis membrane
A reverse osmosis membrane and modification technology, which is applied in the direction of reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., can solve the problems that waste reverse osmosis membranes cannot be modified and restored, and achieve the promotion of recycling, interception The effect of performance recovery
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[0014] Example 1
[0015] The present invention provides a secondary modification method for waste reverse osmosis membranes used in industrial wastewater treatment, which is characterized in that it comprises the following specific steps:
[0016] (1) Degradable polyamide reverse osmosis membrane: Collect the waste reverse osmosis membrane used after industrial wastewater treatment, put the membrane into a beaker containing 3000ppm and pH 10.0 sodium hypochlorite solution, let it stand and soak, and degrade it for 7 hours in the dark. Then rinse the degradation membrane with distilled water repeatedly to remove residual solution on the membrane surface until the cleaning solution is neutral.
[0017] (2) Tannic acid physical coating repair: soak the degradable film into a tannic acid phosphate buffer coating solution with a certain concentration and pH, and the active layer of the degradable film faces downwards, so that the coating solution is in contact with the active layer of th...
Example Embodiment
[0022] Example 2
[0023] The preparation method is the same as that of Example 1, except that the concentration of the tannic acid coating solution is 3000 ppm, the pH is 2.5, and the soaking time is 40 minutes.
[0024] Further, it is characterized in that the coating time of the mixed solution of glutaraldehyde and hydrochloric acid is 6 min.
[0025] Further, it is characterized in that the cross-linking heat treatment temperature is 70° C., and the treatment time is 90 min.
Example Embodiment
[0026] Example 3
[0027] The preparation method is the same as that of Example 1, except that the concentration of the tannic acid coating solution is 1000 ppm, the pH is 4.5, and the soaking time is 80 min.
[0028] Further, it is characterized in that the coating time of the mixed solution of glutaraldehyde and hydrochloric acid is 10 minutes.
[0029] Further, it is characterized in that the cross-linking heat treatment temperature is 40° C., and the treatment time is 80 min.
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