CN102295323A - Water processing method - Google Patents
Water processing method Download PDFInfo
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- CN102295323A CN102295323A CN2011101618440A CN201110161844A CN102295323A CN 102295323 A CN102295323 A CN 102295323A CN 2011101618440 A CN2011101618440 A CN 2011101618440A CN 201110161844 A CN201110161844 A CN 201110161844A CN 102295323 A CN102295323 A CN 102295323A
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- backwash
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Abstract
The invention discloses a water processing method and is characterized in that an elastic hollow fiber film with a pressure responsive function is adopted in the invention to process water and a technological process of using at external normal pressure and backwashing at internal high pressure is adopted with the high pressure being 0.1MPa-0.4MPa. Without new design of a membrane module, the water processing method provided by the invention can be used to greatly improve the physical cleaning effect based on the prior art, reduce the frequency of chemical cleaning and effectively reduce the production cost, and has obvious industrial enforcement feasibility.
Description
Technical field
The present invention relates to water technology, be specially a kind of method of utilizing the spring function hollow-fibre membrane to carry out water treatment.
Background technology
In recent years, development along with membrane technique, have high-elastic, high-strength, heat-resisting, wear-resisting, chemical-resistant resistance, molecule can design, and the polyurethane material of advantages such as shape memory has attracted a lot of system film experts' parent to rely, but because the polyurethane material compact structure, be difficult to pore-forming, in the ultra filtration process, use seldom.The applicant once was system film body material with urethane, by melt-spinning-stretching method, utilize the interface hole creating technology, made polyurethane series hollow-fibre membrane (referring to " a kind of hollow-fibre membrane and manufacture method thereof " [200810053896.4] and " a kind of polyurethane comixing hollow-fibre membrane and manufacture method thereof " [ZL200610013868.0]) with pressure-responsive function.This hollow-fibre membrane has pressure-responsive, under pressurized conditions, film radially can increase considerably (referring to Fig. 1, d
N, 0＜d
N, 1, d
W, 0＜d
W, 1), axially also elongation simultaneously (referring to Fig. 1, L '
0＜L '
1), microvoid structure (size and porosity) can take place to change significantly.Film outer surface porosity, aperture are suitable for external pressure use, interior pressure backwash process all less than internal surface simultaneously.
On the other hand, in existing ultra filtration technology application process, the film pollution can cause flux to descend significantly, influences the use properties of film, has limited further expanding of application of membrane greatly.The method of recovery flux commonly used is to clean and matting is removed attached to the film surface or is embedded in the pollutent of fenestra inside by physics.Physics cleans can control online carrying out automatically, convenient and swift, the effective minimizing work of operating process expenditure, but for existing membrane process, can not efficiently remove pollutent by the physics cleaning, in follow-up filtration procedure, existing pollutent can promote deposition, the fouling of new pollutent, forms physics and cleans the pollution layer that is difficult to remove.In order to remove this pollution, need carry out matting.Matting need be selected suitable clean-out system according to the character of type, pollution level and the film of pollutent itself, and inappropriate clean-out system might reduce the use properties of film significantly, shortens membrane lifetime.Matting needs to stop production fully, and needs the professional to carry out, if matting is frequent, then can shorten film work-ing life, reduces production efficiency, increases production cost.If can improve efficient and effect that physics cleans, just can effectively prevent the deposition of film surface contaminant, reduce pollutent and the enrichment between the contaminant deposition, fouling in the stoste, reduce the number of times of matting, effectively enhance productivity.But for mould material (cellulose acetate, polyvinylidene difluoride (PVDF), polypropylene, polysulfones etc.) commonly used now, its microvoid structure (aperture and porosity) is relatively stable, the effect of cleaning the removal pollutent by physics is relatively poor, directly or indirectly increased the number of times of matting, reduce production efficiency, increased cost.
Summary of the invention
At the deficiencies in the prior art, the technical problem that quasi-solution of the present invention is determined is that a kind of water treatment method is provided.This method can efficiently be removed pollutent for physics cleaning simply, effectively reduces the number of times of matting, prolongs the work-ing life of film, reduces cost.
The technical scheme that the present invention solve the technical problem is: design a kind of water treatment method, it is characterized in that this method adopts the elastic hollow tunica fibrosa with pressure-responsive function to come treating water, and the outer normal pressure of employing uses, the technological process of inner high voltage backwash, and described high pressure is 0.1MPa-0.4MPa.
Compared with prior art, the present invention utilizes the characteristic of spring function hollow-fibre membrane, adopt the processing method treating water of outer normal pressure use, inner high voltage backwash, new design component, on the prior art basis, can improve the effect that physics cleans significantly, reduce the matting number of times, effectively reduce production costs, have tangible industrial implementation feasibility.
Description of drawings
Fig. 1 is macroscopical form synoptic diagram of film in the water treatment procedure of the present invention;
Fig. 2 is external pressure use synoptic diagram in the water treatment procedure of the present invention;
Fig. 3 presses the backwash process synoptic diagram in the water treatment procedure of the present invention;
Fig. 4 is the photo figure of the preceding membrane module of backwash in the water treatment procedure of the present invention;
Fig. 5 for backwash in the water treatment procedure of the present invention after the photo figure of membrane module.
Embodiment
Further specify the present invention below in conjunction with embodiment and accompanying drawing,
A kind of water treatment method (abbreviation method of the present invention's design, referring to Fig. 1-5), it is characterized in that this method adopts the elastic hollow tunica fibrosa with pressure-responsive function to come treating water, and adopt the technological process of outer normal pressure use, inner high voltage backwash, described high pressure is 0.1-0.4MPa.
The inventive method is the improvement that existing film is used for water technology.The working conditions that the conventional now mould material (cellulose acetate, polyvinylidene difluoride (PVDF), polypropylene, polysulfones etc.) that uses is suitable for is used as external pressure and (is taken in mode microfiltration process working pressure for container and generally all be lower than 0.2MPa; And drill traverse there is not the mode membrane module to take the mode of suction filtration, and pressure is generally less than and equals 0.06MPa), interior pressure backwash, backwash process pressure is provided with and generally equals or the pressure when using a little more than external pressure.Because existing membrane pore structure is stable, outer normal pressure used in the present invention uses, the method for inner high voltage backwash can be impelled membrane pore structure generation non-reversible deformation, the filtering accuracy when influence is normally used as if existing process is adopted.And elastic hollow tunica fibrosa used in the present invention has pressure-responsive, and itself has snappiness, is easy to reply and reply the precision height for deformation.(pressure is set in 0.1-0.4MPa to improve backwash pressure, according to working method and be filtered the liquid particular case and decide) can increase hole dimension, porosity, make backwash current increase on the unit surface, effectively remove pollutent, reduce the number of times of matting, prolong the work-ing life of film, reduce production costs; And pressure reduces, and when external pressure used, membrane pore structure returned back to original size, guarantees filter effect.Used elastic hollow tunica fibrosa of the present invention and pressure-responsive characteristic manner thereof are applicable to applicant's patent formerly " a kind of polyurethane comixing hollow-fibre membrane and manufacture method thereof " [ZL200610013868.0].In other words, this formerly the technology contents of patent disclosure be considered as being quoted open by the present invention.
The system film body material of spring function hollow-fibre membrane of the present invention is that polyurethane elastomer or filtering function layer are polyurethane elastomer, and feature is: under the certain pressure condition, film radially can increase considerably (referring to Fig. 1 (a) and (b), d
N, 0＜d
N, 1, d
W, 0＜d
W, 1d
N, 0-film internal diameter when not using, d
N, 1Film internal diameter during-backwash, d
W, 0--film external diameter when not using, d
W, 1Film external diameter during-backwash), axially also extend simultaneously (referring to Fig. 1 (a) and (b), L '
0＜L '
1L '
0--film length when not using, L '
1Film length during-backwash), microvoid structure (size and porosity) can take place to change significantly, and the porosity of film outer surface, aperture be all less than its internal surface simultaneously, thereby be suitable for outer normal pressure use, inner high voltage backwash process.
The inventive method is utilized the characteristic of described spring function hollow-fibre membrane, adopts the processing method treating water of outer normal pressure use, inner high voltage backwash.The inventive method is applicable to that container is taken in mode and drill traverse there is not mode, and the normal pressure during described outer normal pressure uses is meant: under the normal condition, adopt wirking pressure when external pressure uses hollow-fibre membrane; High pressure in the described inner high voltage backwash generally is at 0.1-0.4MPa, guarantees promptly under this pressure that the aperture of film can take place to change significantly, simultaneously film is not caused damage again, guarantee backwash after, membrane pore structure (aperture and porosity) returns back to original state.The concrete using method of the present invention is that (but the membrane module housing that requires container to take in mode guarantees its ultimate compression strength to the existing membrane module of utilization, groove immersion assembly pouring type is same as the prior art), press filtration obtains filtered solution outside normal condition, unavoidably can form cake layer on the film surface at filtration procedure; Suppose that membrane pore structure is trapezoidal, ignore the influence of tortuosity, described spring function hollow-fibre membrane can form cake layer (referring to Fig. 2) in the external pressure use.The interior pressure backwash process and the known using method of described spring function hollow-fibre membrane are similar, but pressure is higher than conventional applying pressure, is 0.1MPa-0.4MPa.Between this pressure zone, can guarantee membrane pore structure generation efficient deformation, and film not caused physical damnification.In the high pressure backwash process, when ambient pressure is applied to the film inwall, because urethane has snappiness, membrane pore structure swells, more conventional film unit surface backwash current under uniform pressure increase, and can effectively remove adhering to of pollutent, reduce pollutent and enrichment between the contaminant deposition, fouling in the stoste, improve the efficient that physics cleans, reduce the number of times of matting.Same hypothesis membrane pore structure is trapezoidal, ignores the influence of tortuosity, and described spring function hollow-fibre membrane is in interior pressure backwash process, and membrane pore structure swells, and the backwash water intensity of flow increases in the unit surface, can effectively improve backwash efficiency (referring to Fig. 3).
Below provide specific embodiments of the invention, with further specific descriptions the present invention, but claim protection domain of the present invention is not subjected to the restriction of specific embodiment.
(size distribution is between 1-30 μ m to utilize inorganic powder, wherein 87.16% hole concentrates between the 4-25 μ m) be dispersed in the water and form suspension liquid as being filtered stoste, (pore size distribution is between 0.08-0.28 μ m to investigate polyurethane series elastic hollow tunica fibrosa, wherein 76.36% hole concentrates between the 0.18-0.22 μ m) under outside casing spare, use, after the backwash, flux is replied situation under the inside casing spare.
Test condition is as follows:
Polyurethane series elastic hollow tunica fibrosa is poured into U type drill traverse do not have the mode membrane module, take the suction filtration mode to carry out outer press filtration, assembly inner membrance area is about 8.64 * 10
-2m
2
Being filtered original liquid concentration is 5 ‰;
Test process is:
(1) pure water flux of test hollow-fibre membrane, test pressure is 0.05MPa, the test duration is 30min, the external pressure test, the pure water flux that obtains film is 70.32L/ (m
2H);
(2) suspension liquid for preparing is filtered, the test duration is 30min, after treating to form obvious cake layer in film surface and the housing, carries out backwash with pure water;
(3) backwash is carried out under 0.1MPa, and the backwash time is 5min;
(4) after the backwash, the pure water flux of test membrane once more, condition is with (1), and the pure water flux that obtains film is 68.93L/ (m
2H); Flux is replied up to 98.02%.
Embodiment 2
The suspension liquid that utilization is made into inorganic powder among the embodiment 1, concentration are 0.5 ‰, investigate the cutoff performance with the elastic hollow tunica fibrosa of being mentioned among the embodiment 1.
Test process is as follows:
Polyurethane series elastic hollow tunica fibrosa is poured into U type assembly, adopt the container mode of taking in to carry out outer press filtration, assembly inner membrance area is about 8.64 * 10
-2m
2Test pressure is 0.1MPa, and the test duration is 120min, on average gets a filtered solution every 20min and tests its turbidity, compares with the stoste turbidity.Continuously tested 120min, average flux is 69.68L/ (m
2H), the stoste turbidity is 32.1ntu, and filtered solution turbidity average out to 0.154.(in " drinking water sanitary standard " that the National Standards Commission that on July 1st, 2007 came into effect far below country and the Ministry of Health unite issue) about tap water turbidity standard (1ntu).Clearance rate is removed effective up to 99.52%.
Embodiment 3
The suspension liquid that utilization is made into inorganic powder among the embodiment 1, concentration are 2 ‰, investigate the response rate with tubular fibre membrane flux after the cutoff performance of the elastic hollow tunica fibrosa of being mentioned among the embodiment 1 and the backwash.
Test process is as follows:
Polyurethane series elastic hollow tunica fibrosa is poured into U type assembly, adopt the container mode of taking in to carry out outer press filtration, assembly inner membrance area is about 8.64 * 10
-2m
2
Test pressure is 0.1MPa, and the test duration is 140min, on average gets a filtered solution every 20min and tests its turbidity, compares with the stoste turbidity.
(1) use pure water, under inside casing spare, the initial transmembrane pressure that records film is 0.06MPa.
(2) external pressure condition, the test duration is 30min, and test pressure is 0.1MPa, and the pure water flux that obtains film is 94.29L/ (m
2H);
(3) suspension liquid for preparing is carried out continuous filtration, it is to be measured on average to get filtered solution 50ml every 20min, and the test duration is 140min (the test flux keeps the constant time), and the filtered solution average turbidity is 0.1751ntu, the stoste turbidity is 273ntu, and clearance rate is 99.94%.
(4) use the pure water backwash, pressure is 0.1MPa, and the backwash time, transmembrane pressure returned back to 0.06MPa when being about 10min.
(5) to record pure water flux be 87.98L/ (m to condition with (2)
2H), the flux response rate is 93.31%.
Embodiment 4
The suspension liquid that utilization is made into inorganic powder among the embodiment 1, concentration are 5 ‰, investigate the response rate with tubular fibre membrane flux after the cutoff performance of the elastic hollow tunica fibrosa of being mentioned among the embodiment 1 and the backwash.
Test process is as follows:
Polyurethane series elastic hollow tunica fibrosa is poured into U type assembly, adopt the container mode of taking in to carry out outer press filtration, assembly inner membrance area is about 8.64 * 10
-2m
2
Test pressure is 0.05MPa, and the test duration is 140min, on average every flux of 10min test, gets a filtered solution every 20min and tests its turbidity, compares with the stoste turbidity.
(1) use pure water, under inside casing spare, the initial transmembrane pressure that records film is 0.06MPa.
(2) external pressure condition, the test duration is 30min, and test pressure is 0.05MPa, and the pure water flux that obtains film is 73.24L/ (m
2H);
(3) suspension liquid for preparing is carried out continuous filtration, it is to be measured to get filtered solution 50ml every 20min, and the test duration is 140min (the test flux keeps the constant time), and the filtered solution average turbidity is 0.1463ntu, and the stoste turbidity is 274ntu, and clearance rate is 99.95%.Fig. 4 has provided preceding this membrane module photo of backwash, has wherein formed a large amount of cake layers as can be seen.
(4) use the filtered solution backwash, pressure is 0.25MPa, and the backwash time, transmembrane pressure returned back to 0.06MPa when being about 3min.Fig. 5 has provided assembly photo after the backwash.
(5) test pure water flux, method is with (2), and obtaining pure water flux is 69.38L/ (m
2H), the flux response rate is 94.73%.
Claims (1)
1. a water treatment method is characterized in that this method adopts the elastic hollow tunica fibrosa with pressure-responsive function to come treating water, and adopts the technological process of outer normal pressure use, inner high voltage backwash, and described high pressure is 0.1MPa-0.4MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110161844 CN102295323B (en) | 2011-06-16 | 2011-06-16 | Water processing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110161844 CN102295323B (en) | 2011-06-16 | 2011-06-16 | Water processing method |
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|---|---|
| CN102295323A true CN102295323A (en) | 2011-12-28 |
| CN102295323B CN102295323B (en) | 2013-06-05 |
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ID=45356033
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110161844 Expired - Fee Related CN102295323B (en) | 2011-06-16 | 2011-06-16 | Water processing method |
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|---|---|
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111499069A (en) * | 2020-04-28 | 2020-08-07 | 江苏永葆环保科技有限公司 | Comprehensive treatment system and treatment method for waste cutting fluid |
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| CN1159769A (en) * | 1994-09-09 | 1997-09-17 | 梅姆泰克美国有限公司 | Cleaning of hollow fibre membranes |
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| CN101406812A (en) * | 2008-11-04 | 2009-04-15 | 东华大学 | Method for producing thermoplastic polyurethane elastomer/polyvinylidene fluoride blended hollow fiber film |
| CN101439269A (en) * | 2008-12-04 | 2009-05-27 | 南昌航空大学 | Method for preparing thermoplastic polyurethane elastic hollow fiber membrane |
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2011
- 2011-06-16 CN CN 201110161844 patent/CN102295323B/en not_active Expired - Fee Related
Patent Citations (8)
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| CN1159769A (en) * | 1994-09-09 | 1997-09-17 | 梅姆泰克美国有限公司 | Cleaning of hollow fibre membranes |
| JP3704544B2 (en) * | 1994-09-09 | 2005-10-12 | ユー・エス・フィルター・ウェイストウォーター・グループ・インコーポレイテッド | Cleaning of hollow fiber membranes |
| WO2003059495A1 (en) * | 2002-01-09 | 2003-07-24 | Hydranautics | Methods for improving filtration performance of hollow fiber membranes |
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| CN101406812A (en) * | 2008-11-04 | 2009-04-15 | 东华大学 | Method for producing thermoplastic polyurethane elastomer/polyvinylidene fluoride blended hollow fiber film |
| CN101439269A (en) * | 2008-12-04 | 2009-05-27 | 南昌航空大学 | Method for preparing thermoplastic polyurethane elastic hollow fiber membrane |
| CN102019150A (en) * | 2010-12-21 | 2011-04-20 | 惠州七芯膜净化环保有限公司 | Polyether sulfone-polyurethane blend hollow fiber membrane and preparation method thereof |
Non-Patent Citations (2)
| Title |
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| 曾振辉等: "聚醚型/聚酯型聚氨酯与聚醚砜共混膜的性能研究", 《福州大学学报（自然科学版）》 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111499069A (en) * | 2020-04-28 | 2020-08-07 | 江苏永葆环保科技有限公司 | Comprehensive treatment system and treatment method for waste cutting fluid |
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