CN1817424A - Improvement of reverse osmose membrane selective separation - Google Patents
Improvement of reverse osmose membrane selective separation Download PDFInfo
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- CN1817424A CN1817424A CN 200610023316 CN200610023316A CN1817424A CN 1817424 A CN1817424 A CN 1817424A CN 200610023316 CN200610023316 CN 200610023316 CN 200610023316 A CN200610023316 A CN 200610023316A CN 1817424 A CN1817424 A CN 1817424A
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Abstract
A process for improving the selective separation performance of reverse osmosis membrane includes such steps as immersing it in the aqueous solution of sodium hypochlorite or hydroxy peroxide at 15-35 deg.C for 3-12 hr, and washing with deionized water.
Description
Technical field
The present invention relates to improve reverse osmosis membrane and select processing method separatory.
Background technology
In recent years, along with being suitable for the directly continuous minimizing of the freshwater resources of use of productive life, pollute in addition and increase the weight of year by year, make that the phenomenon of human lack of water is more serious, people have to turn to underground high salinity bitter even immense seawater with target, the a large amount of salinities that wherein contain are removed, make it change into the fresh water that the mankind can directly use.Only with regard to desalinization, the desalinization amount of whole world every day has reached 3,200 ten thousand tons, and annual speed with 10～30% is increasing.Desalination technology has become one of effective measures that solve water shortage problem.
At present, reverse osmosis has become one of main method of desalinization.Counter-infiltration is to order about down at certain pressure, and high salinity bitter or seawater see through the method that reverse osmosis membrane obtains fresh water.This method uses field extensive, no matter is that seawater or high salinity bitter can both use, in recent years because reverse osmosis technology small investment, energy consume the processing that plurality of advantages such as low, that construction period is lacked is widely used in high salinity bitter or seawater.
When existing polyamide reverse osmose membrane was handled NaCl concentration and is the salt solution of 300-40000mg/L under the operating condition of routine, it took off NaCl and leads greater than 90%.But handling NaCl concentration under the operating condition of routine is 50-250g/L, SO
4 2-Concentration is the mixed salt of 5-60g/L, and it takes off NaCl and leads greater than 8%, and under normal operating condition, the concentration of processed salt solution is high more, and osmotic pressure is just big more, and the minimum or salt solution of existing reverse osmosis membrane circulation can't see through existing reverse osmosis membrane.Simultaneously, see through contained NaCl and SO in the salt solution of reverse osmosis membrane
4 2-The flow of amount and the salt solution that sees through reverse osmosis membrane very big relation is arranged.
Though, occurred this year variously of the improved method of reverse osmosis membrane, still abundant inadequately, handle under the operating condition of routine that to contain NaCl concentration be 50-250g/L, SO
4 2-When concentration is the salt solution of 5-60g/L, can not reaches and take off NaCl and lead, take off SO less than 8%
4 2-Rate is greater than 95% requirement.
Therefore, this area still needs exploitation raising reverse osmosis membrane to select processing method separatory.
Summary of the invention
The object of the invention is to provide the raising reverse osmosis membrane to select processing method separatory.
Therefore, the invention provides the raising reverse osmosis membrane and select processing method separatory, it comprises the steps:
(1) flood reverse osmosis membrane with maceration extract, described maceration extract is that aqueous sodium hypochlorite solution or the concentration of 500-5000mg/L is the aqueous hydrogen peroxide solution of 500-5000mg/L; The temperature of described dipping is 15-35 ℃; Described dip time is 3-12h;
(2) with the reverse osmosis membrane of washed with de-ionized water through step (1) dipping.
The specific embodiment is as follows: the invention provides the raising reverse osmosis membrane and select the step that processing method separatory comprises provides clorox or aqueous hydrogen peroxide solution, the concentration of described aqueous sodium hypochlorite solution is 500-5000mg/L, is preferably 1000-3000mg/L; The concentration of described aqueous hydrogen peroxide solution is 500-5000mg/L, is preferably 1000-2000mg/L.
The method that is used to prepare described aqueous sodium hypochlorite solution or aqueous hydrogen peroxide solution is the method for this area routine.
The present invention also comprises and will flood the step of reverse osmosis membrane with the described aqueous solution, thereby changes the interlinkage degree of described reverse osmosis membrane.Selection crown_interception by means of reverse osmosis membrane makes reverse osmosis membrane under the ordering about of osmotic pressure, and the separating substances that will separate in the processed salt solution is provided may.
And the change of reverse osmosis membrane degree of cross linking size is except relevant with the concentration of maceration extract, also with relevant from extraneous institute applied pressure when the temperature of time of dipping, dipping, the dipping.
The time of dipping of the present invention is 3-12h, is preferably 4-8h; The temperature of described dipping is 15-35 ℃, is preferably 25-33 ℃; From extraneous institute applied pressure is 200-350psi, is preferably 200-300psi.
Reverse osmosis membrane of the present invention is a polyamide reverse osmose membrane, and for example, in an embodiment of the present invention, it is the BW30 polyamide reverse osmose membrane that described reverse osmosis membrane adopts Dow company model.
Reverse osmosis membrane of the present invention is at flat membrane stage or is assembled into component states and carries out impregnation process.In an embodiment of the present invention, described reverse osmosis membrane is to be assembled into component states to carry out impregnation process.
Described assembly is a rolled membrane module.For example, in an embodiment of the present invention, described reverse osmosis membrane is that the model that adopts Dow company to produce is BW30,4040 rolled membrane modules.
The inventive method also comprises the reverse osmosis membrane of employing washed with de-ionized water behind dipping.The mode that is adopted during cleaning is a principle with the reverse osmosis membrane that does not destroy behind dipping, for example adopts the mitigation mode to clean.
The standard of described deionized water has no particular limits, and can be the deionized water standard of this area routine.
The temperature of described deionized water is generally 15-32 ℃.
Method technology of the present invention is simple, easy to operate, and the scope of application is wide, and manufacturing cost and use cost is low.Reverse osmosis membrane behind the inventive method dipping uses it to take off NaCl for a long time and leads and can keep almost constant, particularly under the 300-370psi operating pressure, under 28-32 ℃, handles that to contain NaCl concentration be 50-250g/L, SO
4 2-Concentration is 5-60g/L, when pH is the salt solution of 7-11, takes off NaCl and leads less than 8%, takes off SO
4 2-Rate is greater than 95%; Under the 150-300psi operating pressure, under 25-32 ℃, handling NaCl concentration is 250-2000mg/L, and pH is the NaCl solution of 6-10, and it takes off that NaCl leads is 90-94%.
After reverse osmosis membrane behind method of the present invention dipping uses, can adopt conventional cleaning method to clean earlier, adopt method impregnation process provided by the present invention again, can effectively improve and use the NaCl that takes off of back reverse osmosis membrane to lead and take off SO
4 2-Rate.
Further specify the present invention below in conjunction with embodiment.
Specific embodiment
Pressure described in the embodiment is absolute pressure, except as otherwise noted.SO among the embodiment
4 2-Derive from Na
2SO
4
Embodiment 1
With Dow company model is that BW30 reverse osmosis turbine film concentration of treatment is 500mg/L, and pH is 6.7 NaCl solution, and under the 280psi operating pressure, under 25 ℃, it takes off that NaCl leads is 99%; But adopt another described reverse osmosis membrane, under the 310psi operating pressure, under 29 ℃, handling NaCl concentration is 60g/L, SO
4 2-Concentration is 40g/L, and pH is 7.2 mixed salt, and it takes off SO
4 2-Rate is 83%.
Above-mentioned original BW30 reverse osmosis membrane is placed on the dull and stereotyped test machine, use 1800mg/L, temperature is that 30 ℃ liquor natrii hypochloritis is flooded 9h, from extraneous institute applied pressure is 250psi, relax rinsing with 20 ℃ deionized waters, under the 325psi operating pressure, under 29 ℃, with NaCl concentration is 200g/L, SO
4 2-Concentration is 20g/L, and pH is that 8.0 mixed salt is estimated its performance, and it takes off NaCl and leads 3.2%, takes off SO
4 2-Rate is 95.7%; Under the 225psi operating pressure, under 29 ℃, be 500mg/L with NaCl concentration, pH is its performance of salt water quality evaluation of 6.7, it takes off NaCl and leads 93.8%.
Embodiment 2-7
Change the concentration of the maceration extract liquor natrii hypochloritis among the embodiment 1, the time of dipping, the temperature of maceration extract, from extraneous institute applied pressure, other are identical with embodiment 1 during dipping, the reverse osmosis membrane after obtaining improveing.Under different test conditions, adopt the pH difference, form difference salt water quality evaluation its performance different with concentration, it takes off NaCl and leads and take off SO
4 2-Rate sees Table 1.
Table 1
| Embodiment | Treatment fluid | The concentration of NaClO (mg/L) | The time (h) of dipping | Take off NaCl and lead (%) | Take off SO 4 2-Rate (%) | The condition of impregnation process | Test condition |
| 2 | NaCl concentration is 150g/L, SO 4 2-Concentration is 10g/L, and the pH value is 10.2 mixed-salt aqueous solution | 500 | 12 | 0.25 | 97.7 | 30 ℃ of temperature, pressure 220 psi | 30 ℃ of temperature, pressure 370psi |
| NaCl concentration is 500mg/L, and the pH value is 7.7 NaCl solution | 500 | 12 | 93.2 | --- | 30 ℃ of temperature, pressure 220psi | ||
| 3 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, and the pH value is 11 mixed-salt aqueous solution | 1500 | 9 | 0.2 | 98.1 | 25 ℃ of temperature, pressure 200 psi | 28 ℃ of temperature, pressure 370psi |
| NaCl concentration is 500mg/L, and the pH value is 7.5 NaCl solution | 1500 | 9 | 93.3 | --- | 30 ℃ of temperature, pressure 300psi | ||
| 4 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, and the pH value is 7.2 mixed-salt aqueous solution | 3000 | 8 | 1.2 | 96.0 | 25 ℃ of temperature, pressure 280 psi | 30 ℃ of temperature, pressure 330psi |
| NaCl concentration is 1500mg/L, and the pH value is 6.3 NaCl solution | 3000 | 8 | 93.3 | --- | 27 ℃ of temperature, pressure 225psi | ||
| 5 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, and the pH value is 9.5 mixed-salt aqueous solution | 2000 | 9 | 2.4 | 95.7 | 25 ℃ of temperature, pressure 250 psi | 32 ℃ of temperature, pressure 300psi |
| NaCl concentration is 250mg/L, and the pH value is 9.7 NaCl solution | 2000 | 9 | 94.0 | --- | 25 ℃ of temperature, pressure 300psi | ||
| 6 | NaCl concentration is 100g/L, SO 4 2-Concentration is 45g/L, and the pH value is 7.1 mixed-salt aqueous solution | 5000 | 3 | 5.5 | 95.1 | 33 ℃ of temperature, pressure 350 psi | 31 ℃ of temperature, pressure 300psi |
| NaCl concentration is 1500mg/L, and the pH value is 9.5 NaCl solution | 5000 | 3 | 91.1 | --- | 32 ℃ of temperature, pressure 150psi | ||
| 7 | NaCl concentration is 250g/L, SO 4 2-Concentration is 57g/L, and the pH value is 7.7 mixed-salt aqueous solution | 2500 | 4 | 7.6 | 96.7 | 20 ℃ of temperature, pressure 200 psi, | 28 ℃ of temperature, pressure 330psi |
| NaCl concentration is 250mg/L, and the pH value is 6.5 NaCl solution | 2500 | 4 | 91.1 | --- | 26 ℃ of temperature, pressure 225psi |
Indicate: "---" expression nothing or not test.
Embodiment 8
The model of producing with Dow company is that XLE reverse osmosis turbine film processing NaCl concentration is 1000mg/L, pH is 6.8 NaCl solution, under the 280psi operating pressure, under 25 ℃, it takes off that NaCl leads is 98%, but adopts another described reverse osmosis membrane, under the 330psi operating pressure, under 28 ℃, handling NaCl concentration is 150g/L, SO
4 2-Concentration is 40g/L, and pH is 7.3 mixed salt, and it takes off SO
4 2-Rate is 60%.
Above-mentioned original XLE reverse osmosis membrane is placed on the dull and stereotyped test machine, use 2300mg/L, temperature is that 25 ℃ liquor natrii hypochloritis is flooded 10h, from extraneous institute applied pressure is 250psi, relax rinsing repeatedly with 30 ℃ deionized waters, under the 350psi operating pressure, under 28 ℃, with NaCl concentration is 200g/L, SO
4 2-Concentration is 20g/L, and pH is that 8.6 mixed salt is estimated its performance, and it takes off NaCl and leads 2.1%, takes off SO
4 2-Rate is 96.4%; Under the 250psi operating pressure, under 29 ℃, be 500mg/L with NaCl concentration, pH is its performance of salt water quality evaluation of 6.8, it takes off NaCl and leads 93.4%.
Embodiment 9-16
Change the concentration of the maceration extract liquor natrii hypochloritis among the embodiment 9, the time of dipping, the temperature of maceration extract, from extraneous institute applied pressure, other are identical with embodiment 9 during dipping, the reverse osmosis membrane after obtaining improveing.Under different test conditions, adopt the pH difference, form difference salt water quality evaluation its performance different with concentration, it takes off NaCl and leads and take off SO
4 2-Rate sees Table 2.
From table 2 as seen, among the embodiment 11, described reverse osmosis membrane is 2300mg/L in concentration, temperature is that 50 ℃ liquor natrii hypochloritis is flooded 7h, from extraneous institute applied pressure is 280psi because the temperature of described maceration extract is too high, partial destruction the interlinkage degree of described reverse osmosis membrane, so when the solution described in the employing table was estimated its performance, it took off SO
4 2-Rate is less than 95%.Change described dipping temperature into 25 ℃, other conditions are identical with embodiment 11, flood described reverse osmosis membrane, when the solution described in the employing table is estimated its performance, and requirement according to the invention, embodiment 12 in specifically seeing Table.
And among the embodiment 15, described reverse osmosis membrane is 2500mg/L in concentration, and temperature is that 31 ℃ liquor natrii hypochloritis is flooded 16h, because long soaking time, partial destruction the interlinkage degree of described reverse osmosis membrane, so when the dense mixed-salt aqueous solution described in the employing table was estimated its performance, it took off SO
4 2-Rate only is 31.7%.The change dip time is 6h, and other conditions are identical with embodiment 15, flood described reverse osmosis membrane, when the solution described in the employing table is estimated its performance, and requirement according to the invention, embodiment 16 in specifically seeing Table.
Table 2
| Embodiment | Treatment fluid | The concentration of NaClO (mg/L) | The time (h) of dipping | Take off NaCl and lead (%) | Take off SO 4 2-Rate (%) | The condition of impregnation process | Test condition |
| 9 | NaCl concentration is 100g/L, SO 4 2-Concentration is 10g/L, and the pH value is 10.2 mixed-salt aqueous solution | 500 | 12 | 1.6 | 96.8 | 30 ℃ of temperature, pressure 200psi | 29 ℃ of temperature, pressure 330psi |
| NaCl concentration is 1500mg/L, and the pH value is 6.7 NaCl solution | 500 | 12 | 93.2 | --- | 27 ℃ of temperature, pressure 150psi | ||
| 10 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, and the pH value is 11 mixed-salt aqueous solution | 1500 | 9 | 7.1 | 97.1 | 25 ℃ of temperature, pressure 280psi | 28 ℃ of temperature, pressure 370psi |
| NaCl concentration is 500mg/L, and the pH value is 9.5 NaCl solution | 1500 | 9 | 97.9 | --- | 26 ℃ of temperature, pressure 300psi | ||
| 11 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, and the pH value is 7.2 mixed-salt aqueous solution | 3000 | 7 | 0.0 | 89.4 | 50 ℃ of temperature, pressure 280psi | 32 ℃ of temperature, pressure 370psi |
| NaCl concentration is 500mg/L, and the pH value is 7.5 NaCl solution | 3000 | 7 | 78.6 | --- | 29 ℃ of temperature, pressure 225psi | ||
| 12 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, and the pH value is 7.2 mixed-salt aqueous solution | 3000 | 7 | 0.9 | 95.3 | 25 ℃ of temperature, pressure 280psi | 32 ℃ of temperature, pressure 370psi |
| NaCl concentration is 500mg/L, and the pH value is 7.5 NaCl solution | 3000 | 7 | 94.0 | --- | 29 ℃ of temperature, pressure 225psi | ||
| 13 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, and the pH value is 9.2 mixed-salt aqueous solution | 2000 | 9 | 4.9 | 95.7 | 25 ℃ of temperature, pressure | 28 ℃ of temperature, pressure 300psi |
| NaCl concentration is 250mg/L, and the pH value is 10 NaCl solution | 2000 | 9 | 93.2 | --- | 225psi | 28 ℃ of temperature, pressure 300psi | |
| 14 | NaCl concentration is 100g/L, SO 4 2-Concentration is 45g/L, and the pH value is 7.2 mixed-salt aqueous solution | 5000 | 3 | 3.2 | 95.7 | 18 ℃ of temperature, pressure 300psi | 29 ℃ of temperature, pressure 370psi |
| NaCl concentration is 2000mg/L, and the pH value is 8.7 NaCl solution | 5000 | 3 | 90.8 | --- | 32 ℃ of temperature, pressure 150psi | ||
| 15 | NaCl concentration is 250g/L, SO 4 2-Concentration is 57g/L, and the pH value is 9.7 mixed-salt aqueous solution | 2500 | 16 | 0.0 | 31.7 | 31 ℃ of temperature, pressure 250psi | 28 ℃ of temperature, pressure 300psi |
| NaCl concentration is 500mg/L, and the pH value is 9.7 NaCl solution | 2500 | 16 | 78.6 | --- | 32 ℃ of temperature, pressure 300psi | ||
| 16 | NaCl concentration is 250g/L, SO 4 2-Concentration is 57g/L, and the pH value is 9.7 mixed-salt aqueous solution | 2500 | 6 | 0.3 | 95.6 | 31 ℃ of temperature, pressure 250psi | 28 ℃ of temperature, pressure 300psi |
| NaCl concentration is 500mg/L, and the pH value is 9.7 NaCl solution | 2500 | 6 | 93.3 | --- | 25 ℃ of temperature, pressure 300psi |
Indicate: "---" expression nothing or not survey.
Embodiment 17
The model of producing with Dow company is that XLE counter-infiltration rolled membrane module processing NaCl concentration is 1000mg/L, the pH value is 6.5 NaCl solution, under the 280psi operating pressure, under 25 ℃, it takes off that NaCl leads is 98%, but adopt another described reverse osmosis membrane, handling NaCl concentration under the identical operations condition is 150g/L, SO
4 2-Concentration is 40g/L, and pH is 9.2 mixed salt, and it takes off SO
4 2-Rate only is 50%.
Above-mentioned original XLE reverse osmosis membrane is placed on the dull and stereotyped test machine, use 3500mg/L, temperature is 28 ℃ hydrogenperoxide steam generator dipping 6.5h, institute's applied pressure is 225psi, relax rinsing with 20 ℃ deionized water afterwards, under the 350psi operating pressure, under 29 ℃, with NaCl concentration is 200g/L, SO
4 2-Concentration is 20g/L, and pH is that 7.1 mixed salt is estimated its performance, and it takes off NaCl and leads 3.2%, takes off SO
4 2-Rate is 96.6%; Under the 150psi operating pressure, under 29 ℃, be 500mg/L with NaCl concentration, pH is its performance of salt water quality evaluation of 6.3, it takes off NaCl and leads 93.5%.
Embodiment 18-26
Change the concentration of the maceration extract hydrogenperoxide steam generator among the embodiment 17, the temperature of maceration extract, during dipping from extraneous institute applied pressure, other are identical with embodiment 17, reverse osmosis membrane after obtaining improveing, under different test conditions, adopt the pH difference, form difference salt water quality evaluation its performance different with concentration, it takes off NaCl and leads and take off SO
4 2-Rate sees Table 3.
From table 3 as seen, among the embodiment 20, described reverse osmosis membrane is 3000mg/L in concentration, temperature is that 25 ℃ liquor natrii hypochloritis is flooded 14h, from extraneous institute applied pressure is 300psi and since the dipping overlong time, partial destruction the interlinkage degree of described reverse osmosis membrane, so when the solution described in the employing table was estimated its performance, it took off SO
4 2-Rate is 88.9%.Only the time with dipping changes 6.5h into, and other conditions are identical with embodiment 20, flood described reverse osmosis membrane, when the solution described in the employing table is estimated its performance, and requirement according to the invention, embodiment 21 in specifically seeing Table.
Table 3
| Embodiment | Treatment fluid | H 2O 2Concentration (mg/L) | The time (h) of dipping | Take off NaCl and lead (%) | Take off SO 4 2-Rate (%) | The condition of dipping | Test condition |
| 18 | NaCl concentration is 100g/L, SO 4 2-Concentration is 30 g/L, the mixed-salt aqueous solution of pH value 9.0 | 1500 | 10 | 2.2 | 95.6 | 27 ℃ of temperature, pressure 250 psi | 30 ℃ of temperature, pressure 320psi |
| NaCl concentration is 500mg/L, and the pH value is 7.5 NaCl solution | 1500 | 10 | 93.2 | --- | 29 ℃ of temperature, pressure 225psi | ||
| 19 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20 g/L, the mixed-salt aqueous solution of pH value 10.5 | 2000 | 9 | 0.4 | 97.2 | 25 ℃ of temperature, pressure 220 psi | 28 ℃ of temperature, pressure 360psi |
| NaCl concentration is 1000mg/L, and the pH value is 9 NaCl solution | 2000 | 9 | 92.0 | --- | 25 ℃ of temperature, pressure 250psi | ||
| 20 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20 g/L, the mixed-salt aqueous solution of pH value 10.5 | 3000 | 14 | 0.7 | 88.9 | 25 ℃ of temperature, pressure 300 psi | 29 ℃ of temperature, pressure 370psi |
| NaCl concentration is 1500mg/L, and the pH value is 8.0 NaCl solution | 3000 | 14 | 87.6 | --- | 26 ℃ of temperature, pressure 300psi | ||
| 21 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20 g/L, the mixed-salt aqueous solution of pH value 10.5 | 3000 | 6.5 | 0.52 | 96.3 | 25 ℃ of temperature, pressure 300 psi | 29 ℃ of temperature, pressure 370psi |
| NaCl concentration is 1500mg/L, and the pH value is 8.0 NaCl solution | 3000 | 6.5 | 92.1 | --- | 26 ℃ of temperature, pressure 300psi | ||
| 22 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20 g/L, the mixed-salt aqueous solution of pH value 11 | 1000 | 12 | 0.1 | 98.0 | 32 ℃ of temperature are pressed | 30 ℃ of temperature, pressure 370psi |
| NaCl concentration is 500mg/L, and the pH value is 9.0 NaCl solution | 1000 | 12 | 92.2 | --- | Power 250 psi | 27 ℃ of temperature, pressure 300psi | |
| 23 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20 g/L, the mixed-salt aqueous solution of pH value 8.0 | 3500 | 4 | 6.5 | 95.2 | 32 ℃ of temperature, pressure 270 psi | 28 ℃ of temperature, pressure 300psi |
| NaCl concentration is 1000mg/L, and the pH value is 8.5 NaCl solution | 3500 | 4 | 92.8 | --- | 27 ℃ of temperature, pressure 225psi | ||
| 24 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20 g/L, the mixed-salt aqueous solution of pH value 9.5 | 2000 | 10 | 3.2 | 95.3 | 25 ℃ of temperature, pressure 250 psi | 32 ℃ of temperature, pressure 340psi |
| NaCl concentration is 2000mg/L, and the pH value is 6.7 NaCl solution | 2000 | 10 | 93.2 | --- | 28 ℃ of temperature, pressure 300psi | ||
| 25 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20 g/L, the mixed-salt aqueous solution of pH value 10.3 | 1600 | 12 | 7.8 | 96.9 | 30 ℃ of temperature, pressure 280 psi | 26 ℃ of temperature, pressure 350psi |
| NaCl concentration is 1500mg/L, and the pH value is 8.2 NaCl solution | 1600 | 12 | 93.6 | --- | 27 ℃ of temperature, pressure 225psi | ||
| 26 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20 g/L, the mixed-salt aqueous solution of pH value 10.5 | 4700 | 5 | 0.2 | 95.3 | 25 ℃ of temperature, pressure 225 psi | 30 ℃ of temperature, pressure 370psi |
| NaCl concentration is 250mg/L, and the pH value is 10 NaCl solution | 4700 | 5 | 90.1 | --- | 26 ℃ of temperature, pressure 150psi |
Indicate: "---" expression nothing or not survey.
Embodiment 27
The model of producing with Dow company is BW30, it is 1000mg/L that 4040 coiled reverse osmosis membrane assemblies are handled NaCl concentration, the pH value is 7.2 NaCl solution, under the 280psi operating pressure, under 25 ℃, it takes off that NaCl leads is 99%, but adopt another described reverse osmosis membrane assembly, under the 350psi operating pressure, under 27 ℃, handling NaCl concentration is 200g/L, SO
4 2-Concentration is 50g/L, and pH is 7.5 mixed salt, and it takes off SO
4 2-Rate only is 45%.
With above-mentioned original BW30,4040 coiled reverse osmosis membrane assemblies are placed on the dull and stereotyped test machine, use 2500mg/L, temperature is that 25 ℃ liquor natrii hypochloritis is flooded 7.5h, and institute's applied pressure is 225psi, relaxes rinsing with 23 ℃ deionized water afterwards, under the 350psi operating pressure, under 28 ℃, be 200g/L with NaCl concentration, SO
4 2-Concentration is 20g/L, and pH is that 8.2 mixed salt is estimated its performance, and it takes off NaCl and leads 2.1%, takes off SO
4 2-Rate is 95.7%; Under the 150psi operating pressure, under 26 ℃, be 500mg/L with NaCl concentration, pH is its performance of salt water quality evaluation of 6.7, it takes off NaCl and leads 92.5%.
Embodiment 28-32
Change the time of the dipping of reverse osmosis membrane assembly described in the embodiment 27 among the embodiment 28-32, other are identical with embodiment 27, the reverse osmosis membrane assembly after obtaining improveing.With embodiment 27 identical operations conditions under estimate its performance, it takes off NaCl and leads and take off SO
4 2-Rate sees Table 4.
From table 4 as seen, among the embodiment 28, described reverse osmosis membrane assembly dip time in described oxidizing agent solution is respectively 1h, because the time of flooding in described oxidizing agent solution is not enough, do not reach the needed interlinkage degree of reverse osmosis membrane in the described assembly, so with the mixed salt described in the table when estimating its performance, take off NaCl and lead and take off SO
4 2-Rate does not all reach requirement of the present invention.
The time that described assembly floods in described oxidizing agent solution is controlled in the 3-12h, adopts described high concentration salt solution and its performance of low concentration of salt water quality evaluation, can both reach requirement of the present invention.
The described technical staff in this area by any modification or the change that logic analysis, reasoning or limited test are made, is conspicuous on the technical solution of the present invention basis, is included within protection scope of the present invention.
Table 4
| Embodiment | Treatment fluid | The time (h) of dipping | Take off NaCl and lead (%) | Take off SO 4 2-Rate (%) |
| 28 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, the mixed salt of pH value 7.1 | 1 | 9.6 | 32.9 |
| NaCl concentration is 500mg/L, and the pH value is 6.7 NaCl solution | 1 | 99.05 | --- | |
| 29 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, the mixed salt of pH value 7.1 | 3 | 2.6 | 95.1 |
| NaCl concentration is 500mg/L, and the pH value is 6.7 NaCl solution | 3 | 93.9 | --- | |
| 30 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, the mixed salt of pH value 7.1 | 5 | 2.4 | 95.6 |
| NaCl concentration is 500mg/L, and the pH value is 6.7 NaCl solution | 5 | 92.71 | --- | |
| 31 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, the mixed salt of pH value 7.1 | 8 | 1.9 | 95.8 |
| NaCl concentration is 500mg/L, and the pH value is 6.7 NaCl solution | 8 | 92.60 | --- | |
| 32 | NaCl concentration is 200g/L, SO 4 2-Concentration is 20g/L, the mixed salt of pH value 7.1 | 12 | 1.0 | 95.1 |
| NaCl concentration is 500mg/L, and the pH value is 6.7 NaCl solution | 12 | 91.6 | --- |
Indicate: "---" expression nothing or not survey.
Claims (11)
1. improve reverse osmosis membrane and select processing method separatory, this method comprises:
(1) flood reverse osmosis membrane with maceration extract, described maceration extract is that aqueous sodium hypochlorite solution or the concentration of 500-5000mg/L is the aqueous hydrogen peroxide solution of 500-5000mg/L; The temperature of described dipping is 15-35 ℃; The time of described dipping is 3-12h;
(2) with the reverse osmosis membrane of washed with de-ionized water through step (1) dipping.
2. the method for claim 1 is characterized in that described maceration extract is the aqueous sodium hypochlorite solution of 1000-3000mg/L.
3. the method for claim 1 is characterized in that described maceration extract is the aqueous hydrogen peroxide solution of 1000-2000mg/L.
4. the method for claim 1 is characterized in that described dipping is to carry out under 200-350psi.
5. method as claimed in claim 4 is characterized in that described dipping is to carry out under 200-300psi.
6. the method for claim 1, the temperature that it is characterized in that described dipping is 25-33 ℃.
7. as each described method of claim 1～6, it is characterized in that described dip time is 4-8h.
8. the method for claim 1 is characterized in that described reverse osmosis membrane is a polyamide reverse osmose membrane.
9. method as claimed in claim 8 is characterized in that described polyamide reverse osmose membrane is to flood at flat membrane stage or after being assembled into component states.
10. method as claimed in claim 9 is characterized in that described polyamide reverse osmose membrane is to flood after being assembled into component states.
11. method as claimed in claim 10 is characterized in that described assembly is a rolled membrane module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200610023316 CN1817424A (en) | 2006-01-13 | 2006-01-13 | Improvement of reverse osmose membrane selective separation |
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| CN 200610023316 CN1817424A (en) | 2006-01-13 | 2006-01-13 | Improvement of reverse osmose membrane selective separation |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102512982A (en) * | 2012-01-11 | 2012-06-27 | 浙江理工大学 | Antibacterial oxidation-resistant composite reverse osmosis membrane |
| CN102974221A (en) * | 2012-12-04 | 2013-03-20 | 贵阳时代沃顿科技有限公司 | Method for controlling surface potential of reverse osmosis membrane |
-
2006
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102512982A (en) * | 2012-01-11 | 2012-06-27 | 浙江理工大学 | Antibacterial oxidation-resistant composite reverse osmosis membrane |
| CN102974221A (en) * | 2012-12-04 | 2013-03-20 | 贵阳时代沃顿科技有限公司 | Method for controlling surface potential of reverse osmosis membrane |
| CN102974221B (en) * | 2012-12-04 | 2015-05-20 | 贵阳时代沃顿科技有限公司 | Method for controlling surface potential of reverse osmosis membrane |
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