CN108939938A - A kind of plate seawater reverse osmosis membrane boron-removing rate test method - Google Patents
A kind of plate seawater reverse osmosis membrane boron-removing rate test method Download PDFInfo
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- CN108939938A CN108939938A CN201810841164.5A CN201810841164A CN108939938A CN 108939938 A CN108939938 A CN 108939938A CN 201810841164 A CN201810841164 A CN 201810841164A CN 108939938 A CN108939938 A CN 108939938A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/10—Testing of membranes or membrane apparatus; Detecting or repairing leaks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/06—Flat membranes
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Abstract
The invention belongs to reverse osmosis membrane separation technical field of performance test, disclose a kind of plate seawater reverse osmosis membrane boron-removing rate test method, at room temperature impregnate sea-water reverse osmose diaphragm in deionized water or distilled water；The sodium chloride test fluid containing boric acid is prepared in reverse osmosis membrane test device water tank again, and adjusts pH value；After reverse osmosis membrane is packed into test pond, adjust test device intake pressure, temperature, film surface flow parameters, precompressed is after a certain period of time under this condition again, test device water inlet is collected respectively and is produced water repeatedly and is analyzed boron element concentration, average value is as final water inlet and produces water boron concentration, and then calculates and obtain seawater reverse osmosis membrane boron-removing rate.The present invention specifies the requirement that reverse osmosis membrane should meet when carrying out boron-removing rate test, preprocess method, it proposes that test fluid concentration, pH value, inflow temperature, pressure and surface velocity are controlled and defined, improves the reliability of boron-removing rate test method and the comparativity of testing result and repeatability.
Description
Technical field
The invention belongs to reverse osmosis membrane separation technical field of performance test, specifically, are related to for testing plate sea
The method of water reverse osmosis membrane boron-removing rate.
Technical background
Seawater reverse osmosis membrane is widely used in the fields such as sea water desalination, Industrial Wastewater Treatment.Current seawater reverse osmosis membrane
Based on aromatic polyamides plate membrane, usually it is made of non-woven fabrics, ultrafiltration supporting layer and separating layer.Separating layer main ingredient is virtue
Fragrant polyamide material is the major function layer of reverse osmosis membrane, is played a major role to zwitterion, neutral molecule in removing water.
Boron is that the mankind, animal and plant growth are survived essential microelement, then can be right but take in excessively high boron element
Life entity generates toxicity and a series of adverse effects.For example, boron element should be maintained at 0.75- in soil for wheat growth
Phenomena such as between 1.0mg/L, excessively high boron content will prevent root cell division and lignin deposition, and leaf is caused to turn yellow, fall leaves；
In addition, animal experiments show that the excessively high food of intake boron will cause human and animal in cardiovascular, nervous system and digestion for a long time
Disease occurs for system.Therefore from the angle for ensureing life and health, it is most important to control boron content in water quality.The World Health Organization
(WHO) provide that boron content should be no more than 2.4mg/L in water quality；Countries in the world and linked groups also define water according to itself national conditions
Boron content in matter, as 1mg/L is not to be exceeded in boron content in European Union and Britain's regulation water quality；There is not boron content in u s. state
With requirement (Minnesota State 0.6mg/L, Florey Dazhou City 0.63mg/L, California 1mg/L), provide in Drinking Water in China standard
Boron content should be no more than 0.5mg/L.
Reverse osmosis membrane boron-removing rate is membrane material to Boron In Seawater content usually in 5mg/L or so, Membrane seawater desalination industry
One of the important indicator that research and development institution, manufacturing enterprise and film user pay special attention to.Accurate test reverse osmosis membrane boron-removing rate for
It fully understands that reverse osmosis membrane boron removal property development is horizontal, promotes the innovation of reverse osmosis membrane production technology, ensures Seawater Desalination Project matter
Amount and drinking water safety are of great significance.Current boron-removing rate mainly passes through reverse osmosis membrane separation performance testing device and is examined
It surveys, separate mode is cross-flow, shown in device flow chart 1.Seawater reverse osmosis membrane piece is packed into reverse osmosis membrane test first when test
Certain density boracic test fluid is prepared in pond 1 in water tank 6, is successively opened raw water pump 7 and high-pressure pump 9, is utilized high pressure valve 3
The pressure that inlet gage 2 is adjusted with high-pressure pump 7 controls flow of inlet water using flowmeter 5, and buffer container 4 is for keeping system
Pressure is stablized, and filter 8 carries out boron-removing rate test after test condition to be achieved for removing potential pollutant in water tank 6.
Scientific accurately boron-removing rate measurement and influence of the comprehensive understanding test condition to reverse osmosis membrane boron removal performance are very
Important, this is advantageously used for the science and reliability that improve test result, while being also accurate more different reverse osmosis membranes
Boron-removing rate provides important evidence.In addition, accurately test reverse osmosis membrane boron-removing rate facilitates Seawater Desalination Project designer's root
Suitable membrane component is selected according to design requirement, improves construction quality.However, although researcher is to seawater reverse osmosis membrane so far
Boron-removing rate test method has certain understanding, but seldom influence of the concern test condition to testing result, even some existing
There is the formulation substantial deviation of the test method practical application operating condition of seawater reverse osmosis membrane, causes test result and practical application
It can not be inconsistent.Be rarely reported and be related to the correlation of seawater reverse osmosis membrane boron-removing rate with test condition, and it is current also not about
The system research and report that test condition influences seawater reverse osmosis membrane boron-removing rate.It is de- which results in current seawater reverse osmosis membranes
Boron rate test method lacks and lacks comparativity between certain reliability and science, and different reverse osmosis membranes.
Summary of the invention
The technical problem to be solved by the present invention is to determine the test condition of seawater reverse osmosis membrane boron-removing rate detection, i.e. test-strips
Influence of the part to reverse osmosis membrane boron removal performance, including sample pretreatment, test fluid composition, pH value, intake pressure, inflow temperature,
With film surface flow velocity etc., a kind of comprehensive plate seawater reverse osmosis membrane boron-removing rate test method of system, sample pretreatment letter are provided
Single, strong operability, improves the reliability of boron-removing rate test method, the comparativity of repeatability and testing result.
In order to solve the above-mentioned technical problem, the present invention is achieved by technical solution below:
A kind of plate seawater reverse osmosis membrane boron-removing rate test method, this method follow the steps below:
(1) preprocessing process: taking a piece of sea-water reverse osmose diaphragm, is at room temperature put into the sea-water reverse osmose diaphragm
Impregnated in ionized water or distilled water 30-60 minutes it is spare；
(2) it prepares test fluid: preparing 30000-34000mg/L with deionized water in the water tank of reverse osmosis membrane test device
Sodium chloride solution, then boric acid is added thereto, so that boron element concentration is reached 5-8mg/L；Solution ph is adjusted to 7.5-8.5；
(3) boron-removing rate is tested: test carries out in the reverse osmosis membrane test device, by the seawater reverse osmosis after immersion
Permeable membrane piece is fitted into the test pond of the reverse osmosis membrane test device, successively opens the raw water pump and height of reverse osmosis membrane test device
Intake pressure is boosted to 5-6MPa, 0.85-1.00m/s of membrane surface flow velocity by press pump, and test fluid temperature is adjusted to 24-26 DEG C,
Sampling test is carried out after running 30-60 minutes under the above conditions: repeatedly being collected test device water inlet respectively and is produced water, uses atom
Emission spectrometer (ICP) or Atomic Absorption Spectrometer test water inlet and the boron element concentration for producing water；After being completed, slowly adjust
Shut-off valve makes pressure reduction to 0.1MPa hereinafter, successively closing high-pressure pump and raw water pump；
(4) data processing: taking arithmetic average as final water inlet boron concentration boron concentration in multiple water inlet water sample, will be multiple
Producing boron concentration in water water sample takes arithmetic average to produce water boron concentration as final, de- with following formula calculate flat board seawater reverse osmosis membrane
Boron rate:
R in formulaBIndicate boron-removing rate；CpIt indicates final and produces water boron concentration (mg/L)；CfIndicate final water inlet boron concentration (mg/
L)。
Further, the diaphragm size of sea-water reverse osmose diaphragm described in step (1), which should meet, is completely covered the reverse osmosis
The requirement of test pond sealing ring in permeable membrane test device.
Further, solution ph is adjusted with sodium hydroxide in step (2).
Further, the sea-water reverse osmose diaphragm in test pond in reverse osmosis membrane test device described in step (3)
Effective membrane area should be 25-40cm2。
Further, test device water inlet and production water are collected three times altogether in step (3), primary every 10-15 minutes.
The beneficial effects of the present invention are:
(1) present invention specifies that plate seawater is anti-in the case where fully considering reverse osmosis membrane sea water desalination actual condition
The preprocess method of permeable membrane boron-removing rate test process is proposed to test fluid composition, pH value, intake pressure, inflow temperature and film
The test conditions such as surface velocity are controlled and are defined, and the comprehensive plate seawater reverse osmosis membrane boron-removing rate test side of system is established
Method fills up the blank that test condition influences flat plate reverse osmosis film boron removal performance.
(2) since sample pretreatment process of the invention uses deionized water or distilled water immersion, process is simple, cost
Low, strong operability is easy to spread.
(3) commercial seawater reverse osmosis membrane is mostly plate membrane at present, and it is anti-that test method of the invention is exactly directed to plate seawater
What permeable membrane proposed, therefore, boron-removing rate detection technique of the invention is practical, has important promotional value.
(4) present invention considers influence of the test condition to boron removal result comprehensively during the test, can be more accurate
Understand the boron removal performance of plate seawater reverse osmosis membrane, to judge and compare the boron-removing rate of seawater reverse osmosis membrane, improves boron removal
The reliability of rate test method and the repeatability of testing result.
Detailed description of the invention
Fig. 1 is the device flow chart of reverse osmosis membrane separation performance testing device.
1- reverse osmosis membrane test pond, 2- pressure gauge, 3- high pressure valve, 4- buffer container, 5- flowmeter, 6- water tank, 7- are former
Water pump, 8- filter, 9- high-pressure pump.
Specific embodiment
Below by specific embodiment, the present invention is described in further detail, and following embodiment can make this profession
The present invention, but do not limit the invention in any way is more completely understood in technical staff.Plate seawater in following embodiment is anti-
Permeable membrane is commercialization diaphragm, specially the TM800K type seawater reverse osmosis membrane of toray company production.
Embodiment 1
A piece of non-wrinkle, damaged etc. obvious lack is cut from the TM800K type seawater reverse osmosis membrane that toray company produces
Reverse osmosis membrane test pond sealing ring is completely covered in sunken diaphragm, diaphragm size, and effective membrane area is 25cm2, at room temperature by film
Piece be put into deionized water or distilled water impregnate 30 minutes it is spare；It is prepared in reverse osmosis membrane test device water tank with deionized water
30000mg/L sodium chloride solution, adding boric acid makes boron element concentration reach 5mg/L, and solution ph is adjusted to sodium hydroxide
7.5；Seawater reverse osmosis membrane piece after immersion is fitted into test pond, diaphragm separating layer should be towards the influent side of test pond；Successively
The raw water pump and high-pressure pump for opening reverse osmosis membrane test device, boost to 5MPa, membrane surface flow velocity 0.85m/ for intake pressure
S, test fluid temperature are adjusted to 24 DEG C, carry out sampling test after running 30 minutes under the above conditions: collecting one every 10 minutes
Secondary test device water inlet and production water are collected three times altogether, and the boron element for testing water inlet and production water with Atomic Emission Spectrometer AES (ICP) is dense
Degree；The boron concentration in water sample that will intake three times takes arithmetic average as final water inlet boron concentration, will produce boron concentration in water water sample three times
Arithmetic average is taken to produce water boron concentration as final, with following formula calculate flat board seawater reverse osmosis membrane boron-removing rate:
R in formulaBIndicate boron-removing rate；CpIt indicates final and produces water boron concentration (mg/L)；CfIndicate final water inlet boron concentration (mg/
L)。
Final gained boron-removing rate is 95.4%.
Embodiment 2
A piece of non-wrinkle, damaged etc. obvious lack is cut from the TM800K type seawater reverse osmosis membrane that toray company produces
Reverse osmosis membrane test pond sealing ring is completely covered in sunken diaphragm, diaphragm size, and effective membrane area is 33cm2, at room temperature by film
Piece be put into deionized water or distilled water impregnate 45 minutes it is spare；It is prepared in reverse osmosis membrane test device water tank with deionized water
32000mg/L sodium chloride solution, adding boric acid makes boron element concentration reach 6.5mg/L, and solution ph is adjusted with sodium hydroxide
To 8；Seawater reverse osmosis membrane piece after immersion is fitted into test pond, diaphragm separating layer should be towards the influent side of test pond；Successively
The raw water pump and high-pressure pump for opening reverse osmosis membrane test device, boost to 5.5MPa, membrane surface flow velocity for intake pressure
0.93m/s, test fluid temperature are adjusted to 25 DEG C, carry out sampling test after running 45 minutes under the above conditions: every 15 minutes
It collects a test device water inlet and produces water, collect altogether three times, test water inlet with Atomic Emission Spectrometer AES (ICP) and produce the boron of water
Concentration of element；The boron concentration in water sample that will intake three times takes arithmetic average as final water inlet boron concentration, will produce three times in water water sample
Boron concentration takes arithmetic average to produce water boron concentration as final, with following formula calculate flat board seawater reverse osmosis membrane boron-removing rate:
R in formulaBIndicate boron-removing rate；CpIt indicates final and produces water boron concentration (mg/L)；CfIndicate final water inlet boron concentration (mg/
L)。
Final gained boron-removing rate is 96.0%.
Embodiment 3
A piece of non-wrinkle, damaged etc. obvious lack is cut from the TM800K type seawater reverse osmosis membrane that toray company produces
Reverse osmosis membrane test pond sealing ring is completely covered in sunken diaphragm, diaphragm size, and effective membrane area is 40cm2, at room temperature by film
Piece be put into deionized water or distilled water impregnate 60 minutes it is spare；It is prepared in reverse osmosis membrane test device water tank with deionized water
34000mg/L sodium chloride solution, adding boric acid makes boron element concentration reach 8mg/L, and solution ph is adjusted to sodium hydroxide
8.5；Seawater reverse osmosis membrane piece after immersion is fitted into test pond, diaphragm separating layer should be towards the influent side of test pond；Successively
The raw water pump and high-pressure pump for opening reverse osmosis membrane test device, boost to 6MPa, membrane surface flow velocity 1m/s for intake pressure, survey
Test solution temperature is adjusted to 26 DEG C, runs carry out sampling test after sixty minutes under the above conditions: primary survey was collected every 10 minutes
Trial assembly sets into water and produces water, is collected three times altogether, tests water inlet with Atomic Emission Spectrometer AES (ICP) and produce the boron element concentration of water；
The boron concentration in water sample that will intake three times takes arithmetic average as final water inlet boron concentration, will produce boron concentration in water water sample three times and take calculation
Art averagely produces water boron concentration as final, with following formula calculate flat board seawater reverse osmosis membrane boron-removing rate:
R in formulaBIndicate boron-removing rate；CpIt indicates final and produces water boron concentration (mg/L)；CfIndicate final water inlet boron concentration (mg/
L)。
Final gained boron-removing rate is 95.8%.
The boron-removing rate test result of above-mentioned reverse osmosis membrane is consistent with its operation result in practical sea water desalination application,
This illustrates that seawater reverse osmosis membrane boron-removing rate test method of the invention is mutually agreed with practical application operating condition, is able to reflect seawater reverse osmosis
The practical boron removal performance of permeable membrane.In addition, can effectively remove the dirt of film surface absorption after pre-processing to seawater reverse osmosis membrane
Contaminate object, it is even more important that so that the structure of seawater reverse osmosis membrane is reached balance and stability in water, to make its boron removal performance rear
It keeps stablizing in sequence test.Meanwhile the test conditions such as test fluid concentration, pH value, inflow temperature, pressure and surface velocity being carried out
Clear and control, enhances the repeatability of result, reduces test error, so that being comparable between test result.
Although the preferred embodiment of the present invention is described above in conjunction with attached drawing, the invention is not limited to upper
The specific embodiment stated, the above mentioned embodiment is only schematical, be not it is restrictive, this field it is common
Technical staff under the inspiration of the present invention, can be with when not departing from invention objective and scope of the claimed protection
The specific transformation of many forms is made, within these are all belonged to the scope of protection of the present invention.
Claims (5)
1. a kind of plate seawater reverse osmosis membrane boron-removing rate test method, which is characterized in that this method follows the steps below:
(1) preprocessing process: taking a piece of sea-water reverse osmose diaphragm, and the sea-water reverse osmose diaphragm is put into deionization at room temperature
Impregnated in water or distilled water 30-60 minutes it is spare；
(2) it prepares test fluid: preparing 30000-34000mg/L chlorinations with deionized water in the water tank of reverse osmosis membrane test device
Sodium solution, then boric acid is added thereto, so that boron element concentration is reached 5-8mg/L；Solution ph is adjusted to 7.5-8.5；
(3) boron-removing rate is tested: test carries out in the reverse osmosis membrane test device, by the seawater reverse osmosis membrane after immersion
Piece is fitted into the test pond of the reverse osmosis membrane test device, successively opens the raw water pump and high pressure of reverse osmosis membrane test device
Intake pressure is boosted to 5-6MPa, 0.85-1.00m/s of membrane surface flow velocity by pump, and test fluid temperature is adjusted to 24-26 DEG C,
Sampling test is carried out after running 30-60 minutes under above-mentioned condition: repeatedly being collected test device water inlet respectively and is produced water, is sent out with atom
Penetrate spectrometer or Atomic Absorption Spectrometer test water inlet and the boron element concentration for producing water；After being completed, slow adjustable cut-off valve
Make pressure reduction to 0.1MPa hereinafter, successively closing high-pressure pump and raw water pump；
(4) it data processing: takes arithmetic average as final water inlet boron concentration boron concentration in multiple water inlet water sample, will repeatedly produce water
Boron concentration takes arithmetic average to produce water boron concentration as final in water sample, with following formula calculate flat board seawater reverse osmosis membrane boron removal
Rate:
R in formulaBIndicate boron-removing rate；CpIt indicates final and produces water boron concentration (mg/L)；CfIndicate final water inlet boron concentration (mg/L).
2. a kind of plate seawater reverse osmosis membrane boron-removing rate test method according to claim 1, which is characterized in that step
(1) diaphragm size of sea-water reverse osmose diaphragm described in should meet that test pond in the reverse osmosis membrane test device is completely covered is close
The requirement of seal.
3. a kind of plate seawater reverse osmosis membrane boron-removing rate test method according to claim 1, which is characterized in that step
(2) solution ph is adjusted with sodium hydroxide in.
4. a kind of plate seawater reverse osmosis membrane boron-removing rate test method according to claim 1, which is characterized in that step
(3) effective membrane area of the sea-water reverse osmose diaphragm should be 25- in test pond in reverse osmosis membrane test device described in
40cm2。
5. a kind of plate seawater reverse osmosis membrane boron-removing rate test method according to claim 1, which is characterized in that step
(3) test device water inlet and production water are collected three times altogether in, primary every 10-15 minutes.
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| CN201810841164.5A CN108939938A (en) | 2018-07-27 | 2018-07-27 | A kind of plate seawater reverse osmosis membrane boron-removing rate test method |
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| CN201810841164.5A CN108939938A (en) | 2018-07-27 | 2018-07-27 | A kind of plate seawater reverse osmosis membrane boron-removing rate test method |
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Application publication date: 20181207 |