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Testing method for de-boron rate of coiled brackish water reverse osmosis membrane element

A reverse osmosis membrane and testing method technology, applied in the direction of reverse osmosis, semi-permeable membrane separation, chemical instruments and methods, etc., can solve the problem of deviation from the actual application conditions of brackish water reverse osmosis membrane elements, and the lack of reliability of the boron removal rate test method Sexuality and scientificity, test results do not match the actual application performance, etc., to achieve the effect of easy promotion, low cost and strong practicability

Inactive Publication Date: 2018-12-04
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, so far, although researchers have a certain understanding of the test method for boron removal rate of reverse osmosis membrane elements in brackish water, they have paid little attention to the influence of test conditions on the test results, and even some existing test methods have seriously deviated from bitter salt water. The actual application conditions of salt water reverse osmosis membrane elements cause the test results to be inconsistent with the actual application performance
There are few reports on the correlation between boron removal rate of brackish water reverse osmosis membrane elements and test conditions, and there is currently no systematic research and report on the influence of test conditions on the boron removal rate of brackish water reverse osmosis membrane elements
This has resulted in the lack of reliability and scientificity of the current test method for the boron removal rate of reverse osmosis membrane elements in brackish water, as well as the lack of comparability among different reverse osmosis membrane elements

Method used

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  • Testing method for de-boron rate of coiled brackish water reverse osmosis membrane element
  • Testing method for de-boron rate of coiled brackish water reverse osmosis membrane element
  • Testing method for de-boron rate of coiled brackish water reverse osmosis membrane element

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Rinse the BW30-8040 brackish water reverse osmosis membrane element produced by Dow Company of the United States with deionized water or distilled water with a flow rate of 5L / h for 5 minutes at room temperature; use it in the water tank of the reverse osmosis membrane element permeability test device Prepare 1500mg / L sodium chloride solution with deionized water, then add boric acid to make the boron concentration reach 2mg / L, adjust the pH value of the solution to 6.5 with sodium hydroxide; put the washed brackish water reverse osmosis membrane element into the membrane shell In the middle, the concentrated water regulating valve is fully open, turn on the water supply pump, make the system run at low pressure for 3 minutes, and discharge the air in the system; turn on the energy recovery of the test device in turn, and the high pressure pump to boost the inlet water pressure to 1.5MPa, The recovery rate is 14%, the temperature of the test solution is adjusted to 24 ° ...

Embodiment 2

[0031]Rinse the BW30-8040 brackish water reverse osmosis membrane element produced by American Dow Company with deionized water or distilled water with a flow rate of 6.5L / h for 7.5 minutes at room temperature; put it in the water tank of the reverse osmosis membrane element permeability test device Prepare 1750mg / L sodium chloride solution with deionized water, then add boric acid to make the boron concentration reach 2.5mg / L, adjust the pH value of the solution to 7 with sodium hydroxide; put the brackish water reverse osmosis membrane element after washing into In the membrane shell, the concentrated water regulating valve is fully open, and the water supply pump is turned on to make the system run at low pressure for 4 minutes to discharge the air in the system; turn on the energy recovery of the test device in turn, and the high pressure pump to boost the inlet water pressure to 2MPa , the recovery rate is 15%, the temperature of the test solution is adjusted to 25°C, and ...

Embodiment 3

[0036] Rinse the BW30-8040 brackish water reverse osmosis membrane element produced by Dow Company of the United States with deionized water or distilled water with a flow rate of 8L / h for 10 minutes at room temperature; use it in the water tank of the reverse osmosis membrane element permeability test device Prepare 2000mg / L sodium chloride solution with deionized water, then add boric acid to make the boron concentration reach 3mg / L, adjust the pH value of the solution to 7.5 with sodium hydroxide; put the washed brackish water reverse osmosis membrane element into the membrane shell In the middle, the concentrated water regulating valve is fully open, and the water supply pump is turned on to make the system run at low pressure for 5 minutes, and the air in the system is discharged; the energy recovery of the test device is turned on in turn, and the high-pressure pump boosts the inlet water pressure to 2.5MPa. The recovery rate is 16%, the temperature of the test solution i...

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Abstract

The invention belongs to the technical field of reverse osmosis membrane separation performance testing, and discloses a testing method for the de-boron rate of a coiled brackish water reverse osmosismembrane element. The brackish water reverse osmosis membrane element is swashed with deionized water or distilled water, then a boric acid test solution containing sodium chloride is prepared in a water tank of a reverse osmosis membrane element permeability testing device, and the pH value is adjusted; after the reverse osmosis membrane element is loaded into a membrane shell, the inlet water pressure, temperature and recovery rate are adjusted, prepressing is performed for a certain period of time under the conditions, inlet water and produced water of the testing device are respectively collected for multiple times and the concentrations of boron elements are analyzed, then the average value is used as the final boron concentration of the inlet water and the produced water, and the de-boron rate of the coiled brackish water reverse osmosis membrane element is calculated. The requirements needing to be met by the reverse osmosis membrane element and the pretreatment method during de-boron rate testing are definite, the concentration of the testing solution, the pH value, the inlet water temperature, the pressure and the recovery rate are controlled and defined, and the reliability of the testing method and the comparability and repeatability of the test results are improved.

Description

technical field [0001] The invention belongs to the technical field of reverse osmosis membrane separation performance testing, and in particular relates to a method for testing the boron removal rate of roll-type brackish water reverse osmosis membrane elements. technical background [0002] Brackish water reverse osmosis membrane elements are widely used in brackish water desalination, industrial wastewater treatment and other fields. The current reverse osmosis membrane elements for brackish water are mainly coiled aromatic polyamide membrane elements, which are rolled from reverse osmosis membranes, usually consisting of reverse osmosis membranes, central tubes, inlet water separators, and concentrated water separators. and end plates. The reverse osmosis membrane is the main functional part of the coiled membrane element, which plays a major role in removing anions, cations and neutral molecules in water. [0003] Boron is an essential trace element for the growth and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D61/02B01D65/10C02F1/44C02F103/08
CPCB01D61/025B01D65/10C02F1/441C02F2103/08C02F2209/02C02F2209/03C02F2209/06
Inventor 于慧张梦李强宋杰潘献辉
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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