Rolling method of new reverse osmosis membrane element composed of multi-layer water inlet channel cloth and its composition

A technology of water inlet flow channel and reverse osmosis membrane, which is applied in reverse osmosis, semipermeable membrane separation, chemical instruments and methods, etc., and can solve the problem of decreased desalination rate index of membrane elements, attenuation of flux index of membrane elements, and easy deposition of impurities on the membrane. on-chip issues

Active Publication Date: 2020-10-30
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, reverse osmosis membrane elements are usually composed of the following functional materials: inlet water channel cloth, product water flow channel cloth, reverse osmosis membrane, central tube and sealant. Fold the size of the diaphragm (stack the single-layer water inlet channel cloth into the diaphragm), and then place the single-layer water production cloth according to the specified position, and then use the sealing glue to connect the folded diaphragm to the water collection pipe In addition, the three ends are sealed to form a membrane bag for collecting produced water. At this time, the rolling operation of one membrane element is completed. The above-mentioned method of rolling has the advantage that the production process is mature and stable, and the disadvantage is that the water inlet channel used by a single membrane element The fabric has high hardness, and the desalination layer of the polyamide diaphragm is extremely fragile. The inlet channel cloth is easy to damage the desalination layer during the rolling process, resulting in a decrease in the desalination rate index of the membrane element. Secondly, the membrane rolled by a single-layer inlet channel cloth Due to the single layer of the element, the degree of turbulence in the water intake is not enough during use, and the impurities in the water are easy to deposit on the membrane, and the anti-fouling performance is insufficient. After long-term operation, the flux index of the membrane element is likely to decay

Method used

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  • Rolling method of new reverse osmosis membrane element composed of multi-layer water inlet channel cloth and its composition
  • Rolling method of new reverse osmosis membrane element composed of multi-layer water inlet channel cloth and its composition
  • Rolling method of new reverse osmosis membrane element composed of multi-layer water inlet channel cloth and its composition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] Taking the batch rolling of 8040 membrane elements as an example, the above invention is further explained. A batch of 8040 membrane elements is rolled with a single-layer water inlet runner cloth (normal process) in batches. At the same time, the value of N is calculated according to the formula, and N layers are used in batches. A batch of 8040 membrane elements were rolled with water inlet channel cloth, and other parameters including the diaphragm were all the same. Combined with the above analysis, check the rolling process and the performance test on the system after rolling. This embodiment includes the membrane element rolling part and the performance testing part, specifically including the following steps:

[0052] Implementation steps

[0053] (1) Determination of N (number of layers)

[0054]First, confirm that the model of the membrane element to be rolled is 8040, and confirm the corresponding material parameters, including: 8040 membrane element inlet r...

Embodiment 2

[0081] Taking batch rolling of 4021 membrane elements as an example, the above invention will be further elaborated. A batch of 4021 membrane elements will be rolled with a single layer of water inlet runner cloth (normal process) in batches, and the value of N will be calculated according to the formula, and N layers will be used in batches. A batch of 4021 membrane elements are rolled with water inlet channel cloth, and other parameters including the diaphragm are all the same. Combined with the above analysis, check the rolling process and the performance test on the system after rolling. This embodiment includes the membrane element rolling part and the performance testing part, specifically including the following steps:

[0082] Implementation steps

[0083] (1) Determination of N (number of layers)

[0084] First, confirm that the model of the membrane element to be rolled is 4021, and confirm the corresponding material parameters, including: 4021 membrane element inl...

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Abstract

The invention discloses multilayer water inlet runner cloth and a rolling method of a novel reverse osmosis membrane element composed of the multilayer water inlet runner cloth. The water inlet runnercloth is formed by stacking multiple layers of single-layer water inlet runner cloth from top to down in sequence; adjacent stacked pieces of single-layer water inlet runner cloth are fixedly connected with each other through uniformly distributed points; a membrane rolling machine is used for respectively placing a prepared membrane, the water inlet runner cloth and water production runner clothaccording to specified positions, and then the other three ends, connected with a water collection pipe, and the folded membrane are sealed with a sealant to form a membrane bag for collecting produced water, namely the membrane element is rolled. The membrane rolling method disclosed by the invention can effectively increase the desalinization rate of the membrane element and suppress attenuation of the flux of the membrane element, so that the fouling resistance of the membrane element is enhanced, procedures of a traditional membrane rolling process are maintained, and the finished productratio is high; under the same conditions, the performance of the membrane element rolled by the multilayer water inlet runner cloth disclosed by the invention is higher than that of a membrane element rolled by a traditional single-layer water inlet runner cloth.

Description

technical field technical field [0001] The invention belongs to the technical field of reverse osmosis membrane element rolling, and in particular relates to a rolling method of a novel reverse osmosis membrane element composed of a multi-layer water inlet channel cloth and the composition thereof. Background technique [0002] As the core component of water treatment, the reverse osmosis membrane element is the key to realize the deep filtration in the field of water treatment. Its two most important performance indicators are desalination rate and water flux. Due to its high technological content, the reverse osmosis membrane is mature The process system and stable quality assurance have been unanimously affirmed inside and outside the industry. [0003] At present, reverse osmosis membrane elements are usually composed of the following functional materials: inlet water channel cloth, product water flow channel cloth, reverse osmosis membrane, central tube and sealant. ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): B01D61/02B01D61/08B01D63/06C02F1/44
CPCB01D61/025B01D61/08B01D63/061B01D63/065B01D2313/08C02F1/441
Inventor王双蔡相宇李泽东殷苗苗
OwnerTIANJIN UNIV