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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

Pending Publication Date: 2020-07-24
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem that the waste reverse osmosis membrane used for industrial treatment cannot be modified to restore its filtration and retention in the background technology, the present invention proposes a method for repairing and modifying the waste reverse osmosis membrane. The repair and modification method provided by the present invention The industrial waste reverse osmosis membrane is reprocessed by a unique method, and the filtration and retention of the modified reverse osmosis membrane are restored; the use cost of the reverse osmosis membrane in industrial wastewater treatment is greatly reduced; the waste membrane module is reduced. The destruction of the environment; the discarded reverse osmosis membrane has greater value after reuse, and this invention promotes the recycling of resources

Method used

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Examples

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Embodiment 1

[0015] The invention provides a method for secondary modification of a waste reverse osmosis membrane used for industrial wastewater treatment, which is characterized in that it comprises the following specific steps:

[0016] (1) Degradation of polyamide reverse osmosis membrane: Collect the waste reverse osmosis membrane used after industrial wastewater treatment, put the membrane into a beaker filled with 3000ppm and pH 10.0 sodium hypochlorite solution, let it stand for soaking, and degrade it in the dark for 7h. Then rinse the degraded membrane repeatedly with distilled water to remove the residual solution on the surface of the membrane until the cleaning solution is neutral.

[0017] (2) Tannic acid physical coating repair: Soak the degraded film into a tannic acid phosphate buffer coating solution with a certain concentration and pH, with the active layer of the degraded film facing down, so that the coating solution is in single-sided contact with the active layer of t...

Embodiment 2

[0023] The preparation method is the same as that in 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 minutes.

[0025] Further, it is characterized in that the cross-linking heat treatment temperature is 70° C., and the treatment time is 90 minutes.

Embodiment 3

[0027] The preparation method is consistent with that of Example 1, except that the concentration of the tannic acid coating liquid 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 minutes.

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Abstract

The invention discloses a method for repairing and modifying a waste reverse osmosis membrane. The method comprises the following specific steps: (1) degrading a surface polyamide separation layer ofthe waste reverse osmosis membrane by adopting sodium hypochlorite; (2) physically coating the surface of the membrane with tannic acid; and (3) carrying out chemical crosslinking by using glutaraldehyde to obtain the repaired and modified reverse osmosis membrane. The method is beneficial to promotion of resource recycling.

Description

technical field [0001] The invention relates to the technical field of reverse osmosis membrane treatment, in particular to a method for repairing and modifying waste reverse osmosis membranes. Background technique [0002] Reverse osmosis (RO) membrane is an artificial semipermeable membrane with certain characteristics made of simulated biological semipermeable membrane, and is the core component of reverse osmosis technology. Due to its good separation performance, thin thickness and high pressure resistance, it has been widely used in the fields of seawater desalination, desalination, wastewater treatment and concentration separation, and has been widely used in electric power, food and beverage, pharmaceutical, chemical, petroleum and other industries. The application has created huge economic benefits for the society. However, the problems of membrane fouling and membrane chlorination are the important reasons leading to the decline of separation performance and short...

Claims

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Application Information

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IPC IPC(8): B01D65/10B01D61/02C02F1/44
CPCB01D65/108
Inventor 叶卉张玉忠王丰恺操程杨国栋李泓
Owner TIANJIN POLYTECHNIC UNIV
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