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Panel seawater reverse osmosis membrane boron removal rate testing method

A technology of reverse osmosis membranes and testing methods, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology, etc., can solve the deviation from the actual application conditions of seawater reverse osmosis membranes, lack of comparability of different reverse osmosis membranes, and few Pay attention to the impact of test conditions and other issues to achieve the effect of easy promotion, improved repeatability, and low cost

Inactive Publication Date: 2018-12-07
TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Panel seawater reverse osmosis membrane boron removal rate testing method
  • Panel seawater reverse osmosis membrane boron removal rate testing method
  • Panel seawater reverse osmosis membrane boron removal rate testing method

Examples

Experimental program
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Effect test

Embodiment 1

[0028] Cut a piece of membrane without obvious defects such as wrinkles and breakages from the TM800K seawater reverse osmosis membrane produced by Toray Corporation in Japan. The size of the membrane completely covers the sealing ring of the reverse osmosis membrane test pool, and the effective membrane area is 25cm 2 , Soak the diaphragm in deionized water or distilled water for 30 minutes at room temperature; use deionized water to prepare 30000mg / L sodium chloride solution in the water tank of the reverse osmosis membrane test device, and then add boric acid to make the boron concentration reach 5mg / L, the pH value of the solution was adjusted to 7.5 with sodium hydroxide; put the soaked seawater reverse osmosis membrane into the test tank, the membrane separation layer should face the water inlet side of the test tank; turn on the reverse osmosis membrane test device in turn Raw water pump and high-pressure pump, boost the inlet water pressure to 5MPa, the flow velocity o...

Embodiment 2

[0033] Cut a piece of membrane without obvious defects such as wrinkles and breakages from the TM800K seawater reverse osmosis membrane produced by Toray Corporation in Japan. The size of the membrane completely covers the sealing ring of the reverse osmosis membrane test pool, and the effective membrane area is 33cm 2, Soak the diaphragm in deionized water or distilled water for 45 minutes at room temperature; use deionized water to prepare a 32000mg / L sodium chloride solution in the water tank of the reverse osmosis membrane test device, and then add boric acid to make the boron concentration reach 6.5 mg / L, the pH value of the solution was adjusted to 8 with sodium hydroxide; put the soaked seawater reverse osmosis membrane into the test tank, the membrane separation layer should face the water inlet side of the test tank; turn on the reverse osmosis membrane test device in turn Raw water pump and high-pressure pump, boost the inlet water pressure to 5.5MPa, the flow velocit...

Embodiment 3

[0038] Cut a piece of membrane without obvious defects such as wrinkles and breakages from the TM800K seawater reverse osmosis membrane produced by Toray Corporation in Japan. The size of the membrane completely covers the sealing ring of the reverse osmosis membrane test pool, and the effective membrane area is 40cm 2 , Soak the diaphragm in deionized water or distilled water for 60 minutes at room temperature; prepare 34000mg / L sodium chloride solution with deionized water in the water tank of the reverse osmosis membrane test device, and then add boric acid to make the boron concentration reach 8mg / L, the pH value of the solution was adjusted to 8.5 with sodium hydroxide; put the soaked seawater reverse osmosis membrane into the test tank, the membrane separation layer should face the water inlet side of the test tank; turn on the reverse osmosis membrane test device in turn Raw water pump and high pressure pump, boost the inlet water pressure to 6MPa, the surface flow velo...

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Abstract

The invention belongs to the technical field of testing of reverse osmosis membrane separation performance, and discloses a panel seawater reverse osmosis membrane boron removal rate testing method. The testing method comprises the following steps: soaking a seawater reverse osmosis membrane in deionized water or distilled water at room temperature; preparing a boric acid-containing sodium chloride testing solution in a reverse osmosis membrane testing device, and regulating the pH value; after filling the reverse osmosis membrane into a testing pool, regulating the water inlet pressure, temperature, membrane surface flow velocity parameters of the testing device, respectively collecting inlet water and outflowing water of the testing device for many times and analyzing the concentration of boron element, wherein an average value is used as the finally inlet water and outlet water boron concentration; and further calculating to obtain the boron removal rate of the seawater reverse osmosis membrane. The demand and a pretreatment method of which the reverse osmosis membrane needs to meet in boron removal rate testing is clear, the testing solution concentration, pH value, inlet watertemperature, pressure and surface flow velocity are controlled and defined, and the reliability of the boron removal rate testing method and the comparability and repeatability of detection results can be improved.

Description

technical field [0001] The invention belongs to the technical field of separation performance testing of reverse osmosis membranes, and in particular relates to a method for testing the boron removal rate of flat seawater reverse osmosis membranes. technical background [0002] Seawater reverse osmosis membranes are widely used in seawater desalination, industrial wastewater treatment and other fields. The current seawater reverse osmosis membrane is mainly composed of aromatic polyamide flat membrane, which is usually composed of non-woven fabric, ultrafiltration support layer and separation layer. The main component of the separation layer is aromatic polyamide material, which is the main functional layer of the reverse osmosis membrane and plays a major role in removing anions, cations and neutral molecules in water. [0003] Boron is an essential trace element for the growth and survival of humans, animals and plants, but excessive intake of boron will cause toxicity an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/06B01D65/10
CPCB01D69/06B01D65/10
Inventor 李强于慧张梦潘献辉
Owner TIANJIN SEA WATER DESALINATION & COMPLEX UTILIZATION INST STATE OCEANOGRAPHI
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