CN111495194B - Repair method for root damage of membrane filaments of hollow fiber curtain type membrane component - Google Patents
Repair method for root damage of membrane filaments of hollow fiber curtain type membrane component Download PDFInfo
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- CN111495194B CN111495194B CN202010327338.3A CN202010327338A CN111495194B CN 111495194 B CN111495194 B CN 111495194B CN 202010327338 A CN202010327338 A CN 202010327338A CN 111495194 B CN111495194 B CN 111495194B
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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
- B01D65/106—Repairing membrane apparatus or modules
- B01D65/108—Repairing membranes
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The invention provides a method for repairing the damaged root of a membrane filament of a hollow fiber curtain type membrane component, which comprises the following steps: and (3) using an adhesive treatment solution to perform infiltration treatment on the root of the membrane wire of the hollow fiber curtain type membrane assembly, and then curing the adhesive. The repairing method specifically comprises the following steps: cleaning the hollow fiber curtain type membrane module, and then blowing; preparing an adhesive treatment liquid; soaking the root of the membrane filament of the hollow fiber curtain type membrane component by using an adhesive treatment solution; and (5) airing the hollow fiber curtain type membrane assembly to cure the adhesive. According to the repairing method, under the condition that the original structure of the membrane component is not changed, the damaged position of the root of the membrane component is repaired by using the adhesive treatment liquid, the treatment effect is obvious, the problems of poor on-line medicine washing effect, high effluent turbidity and the like caused by damage of the membrane layer can be solved, membrane pollution is slowed down to a certain degree, the service life of the membrane component is prolonged, the influence on membrane flux is small, the shaking amount is not changed, a new swinging point is not formed, the cost is low, and the treatment efficiency is high.
Description
Technical Field
The invention belongs to the technical field of repair of hollow fiber membrane components, and particularly relates to a repair method for root damage of membrane filaments of a hollow fiber curtain type membrane component.
Background
A Membrane Bioreactor (MBR) process is a novel water treatment technology organically combining a membrane separation technology and a traditional biological treatment technology of sewage and wastewater, a curtain type microfiltration or ultrafiltration membrane component is directly added into an activated sludge tank to replace a secondary sedimentation tank for sludge-water separation, and the MBR process has the advantages of large regulation and control space of technical conditions such as sludge age and sludge concentration, high effluent water quality standard, good stability, small floor area, small residual sludge amount, compact structure and the like. Under the global trend of sewage resource utilization, the MBR process has received much attention from all countries in the world. However, various problems generated in the operation, cleaning and disassembly processes of the MBR are key factors for restricting the application of the MBR process.
In the process of engineering operation, the conventional MBR curtain type membrane module usually adopts an aeration mode to relieve the deposition of pollutants on the surface of the membrane and improve the treatment efficiency. However, at the same time, the floating of the mud causes serious winding and aggregation of hair fibers at the upper end of the curtain film, and further, abrasion between the film filaments and the accumulated objects is increased, thereby causing a problem of film layer damage. On the other hand, root glue-climbing problems of different degrees exist in the manufacturing process of the membrane component, and membrane filaments are easy to frequently bend at the junction in the aeration swing process to cause membrane layer damage. In addition, the possibility of scratching the surface of the film layer is increased due to excessive sundries in the film pool caused by poor management, and even the film layer falls off due to the action of external force. These problems will directly lead to two aspects of impact: 1) The medicament is seriously lost during on-line medicament washing, the medicament washing effect is poor, the pollution speed of the membrane component is increased, and the operation and washing cost is increased; 2) The quality of the effluent water is deteriorated, and the turbidity is improved.
In order to solve the problem of membrane silk rete breakage, the prior art scheme mainly uses "the source to administer" as the main, when the membrane module preparation promptly, alleviates the swing range of root zone membrane silk to the mode that increases the root backplate, or uses the silicon rubber hose to make the beam forming and then protect root membrane silk as the unit, reduces the emergence of the damaged condition. However, in the actual operation process, the protection in the forms still inevitably causes the damage problem of the root membrane filaments, and the protection effect is not obvious. The inventor adopts direct injecting glue mode to restore the damaged membrane silk in root in the exploration process of earlier stage, includes: manufacturing a cavity; injecting glue; curing the glue; and removing the cavity, namely manufacturing a cavity with better peripheral sealing property at the upper end of the diaphragm capsule, then directly injecting glue into the cavity, and encapsulating the damaged area after the glue is cured. The method can solve the problem of film damage, but has a plurality of defects: a. large membrane area loss: after the damaged area is filled with glue in a glue injection mode, hairs, fibers, sludge and the like can be deposited again at the position above the glue injection position in the operation process of the membrane assembly, and the covered area has no water production function any more. b. Shake amount reduction of the curtain-type membrane module having a rod: the membrane assembly needs to be vertically placed in the treatment process and then operates, membrane filaments are vertically gathered at the lower end under the action of gravity and are fixed by potting and glue injection, so that the effective length of the membrane filaments is reduced, and the shaking amount is reduced; c. new breakage points are generated: a new swing point is generated at the interface position of glue injection, and the root membrane silk film layer is still damaged again after long-term operation. d. Low treatment efficiency (long cycle), high cost, easy hole blockage and large area loss. Therefore, a repair method for the damaged root of the membrane filament of the hollow fiber curtain type membrane component, which has the advantages of small influence on the membrane flux, no change of the shaking amount, no formation of a new swing point, low cost, high treatment efficiency and obvious treatment effect, is urgently needed at present.
Disclosure of Invention
The invention solves the technical problem of providing a repair method for root damage of membrane filaments of a hollow fiber curtain type membrane component, which repairs the root damage position of the membrane component by using an adhesive treatment solution under the condition of not changing the original structure of the membrane component, has obvious treatment effect, can solve the problems of poor on-line medicinal washing effect, high effluent turbidity and the like caused by membrane layer damage, can slow down membrane pollution to a certain degree, prolongs the service life of the membrane component, has little influence on membrane flux, does not form new swinging points, has low cost and high treatment efficiency.
In order to solve the above problems, the present invention provides a method for repairing a damaged root of a membrane filament of a hollow fiber curtain type membrane module, comprising: and (3) using an adhesive treatment solution to perform infiltration treatment on the root of the membrane wire of the hollow fiber curtain-type membrane assembly, and then curing the adhesive to finish repairing the damaged root of the membrane wire of the hollow fiber curtain-type membrane assembly.
The membrane filament roots of the hollow fiber curtain type membrane component are soaked by the adhesive treatment solution, so that the damaged membrane layer in the root region of the membrane component and the exposed hook braided rope caused by long-term engineering operation can be blocked by the adhesive, the membrane filament strength in the region is enhanced, and the aims of improving the online medicinal washing effect, reducing the effluent turbidity, slowing down the membrane pollution rate and prolonging the service life of the membrane component are fulfilled. In addition, the process can recover redundant treatment liquid on the premise of meeting the requirement of infiltration plugging, and can greatly save the cost.
Preferably, the repairing method specifically comprises the following steps:
a. cleaning the hollow fiber curtain type membrane module, and then blowing;
b. preparing an adhesive treatment liquid;
c. using the adhesive treatment liquid to perform infiltration treatment on the root of the membrane filament of the swept hollow fiber curtain type membrane assembly;
d. and airing the soaked hollow fiber curtain type membrane assembly, and curing the adhesive to repair the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly.
Preferably, the adhesive treatment liquid comprises an adhesive and a diluent, and the mass ratio of the adhesive to the diluent is (0.5-10): 1. the adhesive is mixed with the diluent, and the fluidity and the wettability of the adhesive are better due to the existence of the diluent.
Preferably, the adhesive is an oily adhesive, and the diluent is an oily solvent; or the adhesive is an aqueous adhesive, and the diluent is an aqueous solvent. The oily adhesive and the oily solvent are mixed, the aqueous adhesive and the aqueous solvent are mixed, the compatibility of the adhesive and the solvent is ensured, and different types of adhesives can be mixed and matched for use on the basis of the oily adhesive or the aqueous adhesive. And two or more treatment liquids with different attributes can be configured for sequential use on the basis of ensuring that the requirements of hardness and strength performance are met.
Preferably, the adhesive is one or a mixture of several of polyurethane adhesive, acrylic resin adhesive, silicone rubber adhesive and epoxy resin adhesive.
The diluent is preferably a solvent or solubilizer which has good wettability with the membrane silk material, and is preferably one or a mixture of more of dichloromethane, acetone, ethyl acetate, dimethyl carbonate, dibasic ester, dioctyl adipate, D40 solvent oil, dimethylacetamide and gamma-butyrolactone.
Preferably, the water content of the hollow fiber curtain membrane module after purging in the step a is not more than 5%. Too high water content of the membrane filaments can affect the curing effect of the resin adhesive and further affect the repairing effect, so that strict water content of the membrane assembly is a key factor for success or failure of repairing.
Preferably, step b is specifically: preparing an adhesive treatment solution from the adhesive and the diluent according to the mass ratio, and fully and uniformly stirring.
Preferably, the length of the treated area is 5% -20% of the length of the membrane filaments of the hollow fiber curtain membrane module during the soaking treatment.
Further, the length of the area of the infiltration treatment is determined according to the damage condition of the membrane layer of the membrane at the root of the membrane component, preferably, the upper end treatment length of the membrane wire of the hollow fiber curtain type membrane component is 3-15cm during the infiltration treatment, and further preferably, the upper end treatment length of the membrane wire of the hollow fiber curtain type membrane component is 6-10cm; the lower end treatment length of the membrane filaments of the hollow fiber curtain type membrane component is 3-8cm; further preferably, the lower end treatment length of the membrane filaments of the hollow fiber curtain membrane module is 4-6cm.
The soaking treatment can adopt any mode which can enable the resin adhesive to be uniformly attached to the film filaments and block the hook braided rope and can enable the film filaments not to be adhered, and preferably, the soaking treatment adopts one or more of soaking, spraying and brushing.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the repair method for the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly, under the condition that the original structure of the membrane assembly is not changed, the adhesive treatment liquid is used for soaking the root of the membrane filament of the hollow fiber curtain type membrane assembly, the damaged membrane layer and the exposed crocheted rope in the root area of the membrane assembly, which are caused by long-term engineering operation, can be blocked by the adhesive, the resins on the surfaces of the damaged membrane layer and the crocheted rope are completely cured, and the membrane filament is not adhered, so that the strength of the membrane filament in the area is enhanced, and the purposes of improving the online medicinal washing effect, reducing the effluent turbidity, slowing down the membrane pollution rate and prolonging the service life of the membrane assembly are achieved;
2. compared with a repair mode of direct glue injection, the repair method of the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly has the advantages of small influence on membrane flux, no formation of a new swing point, low cost, high treatment efficiency, obvious treatment effect and the like;
3. according to the repair method for the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly, the damaged membrane layer and the exposed hook braided rope are plugged by the adhesive in an infiltration mode, redundant treatment liquid can be recovered on the premise of meeting infiltration plugging, and the cost can be greatly saved.
Drawings
FIG. 1 is a scanning electron microscope image of a hollow fiber curtain membrane module before repair treatment where the root of the membrane filament is broken;
FIG. 2 is a scanning electron micrograph of the film filament crochet galloon strands of the hollow fiber curtain membrane module prior to the repair process;
FIG. 3 is a scanning electron microscope image of a damaged root of a membrane filament after being repaired by the method for repairing a damaged root of a membrane filament of a hollow fiber curtain type membrane module according to embodiment 1;
FIG. 4 is a scanning electron microscope image of a crochet rope of membrane filaments after being repaired by the repair method for root damage of membrane filaments of the hollow fiber curtain type membrane module described in this example 1;
FIG. 5 is a scanning electron microscope image of the inner wall of a crocheted rope repaired by the repair method for root damage of hollow fiber curtain type membrane module membrane filaments described in this example 1;
FIG. 6 is an operation diagram of repairing a root damage of a membrane thread by the direct injection method of comparative example 1.
Detailed Description
The technical solutions of the present invention will be described clearly and completely below with reference to embodiments of the present invention, and it should be apparent that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The method for repairing the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly in the embodiment specifically comprises the following steps:
a. taking out the hollow fiber curtain type membrane assembly from the assembly device, cleaning, and performing a rapid purging process after cleaning, wherein the water content is controlled to be less than or equal to 5%;
b. mixing the oil-based polyurethane resin adhesive with solvent butyrolactone according to the mass ratio of 2;
c. soaking the root of the membrane filament of the blown hollow fiber curtain type membrane assembly by using the adhesive treatment liquid, wherein the treatment length of the root of the upper end of the membrane filament is 8cm, and the treatment length of the root of the lower end of the membrane filament is 5cm;
d. placing the soaked hollow fiber curtain type membrane assembly in a well-ventilated place for airing, volatilizing a solvent in the adhesive treatment solution, and finishing the repair of the damaged root of the membrane wire of the hollow fiber curtain type membrane assembly after the adhesive is cured.
Fig. 1 and fig. 2 are scanning electron microscope images of a damaged part of a film filament root and a hook braid of a hollow fiber curtain-type film assembly before repair treatment, fig. 3 and fig. 4 are scanning electron microscope images of a damaged part of a film filament root and a hook braid after repair by the repair method for a damaged part of a film filament root of a hollow fiber curtain-type film assembly according to the present embodiment, and fig. 5 is a scanning electron microscope image of an inner wall of a hook braid after repair by the repair method for a damaged part of a film filament root of a hollow fiber curtain-type film assembly according to the present embodiment. It can be seen from the figure that after the repairing method is adopted for repairing, the damaged film layer on the film yarn and the exposed crocheted rope can be blocked by the adhesive, the adhesive on the surface layers of the damaged film layer and the crocheted rope after treatment is completely cured, and the film yarn is not adhered.
Example 2
The method for repairing the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly in the embodiment specifically comprises the following steps:
a. taking out the hollow fiber curtain type membrane assembly from the assembly device, cleaning, and performing a rapid purging process after cleaning, wherein the water content is controlled to be less than or equal to 5%;
b. mixing an oily acrylic resin adhesive with ethyl acetate and dichloromethane serving as solvents according to a mass ratio of 1;
c. spraying the root of the membrane filament of the blown hollow fiber curtain type membrane assembly by using the adhesive treatment liquid, wherein the treatment length of the root at the upper end of the membrane filament is 6cm, and the treatment length of the root at the lower end of the membrane filament is 4cm;
d. placing the soaked hollow fiber curtain type membrane assembly in a well-ventilated place for airing, volatilizing a solvent in the adhesive treatment solution, and finishing the repair of the damaged root of the membrane wire of the hollow fiber curtain type membrane assembly after the adhesive is cured.
The condition of a scanning electron microscope image of the surface of a repaired membrane filament of the hollow fiber curtain type membrane assembly after the repair method for the root damage of the membrane filament is similar to that of the repair method for the root damage of the membrane filament in the embodiment 1, the damaged membrane layer and the exposed crocheted rope on the membrane filament are blocked by the adhesive, the adhesive on the surface layers of the treated damaged membrane layer and the crocheted rope is completely cured, and the membrane filaments are not adhered.
Example 3
The method for repairing the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly in the embodiment specifically comprises the following steps:
a. taking out the hollow fiber curtain type membrane assembly from the assembly device for cleaning, and performing a rapid purging process after cleaning, wherein the water content is controlled to be less than or equal to 5%;
b. mixing an aqueous epoxy resin adhesive with a solvent acetone according to a mass ratio of 10;
c. brushing the root of the membrane wire of the swept hollow fiber curtain type membrane assembly by using the adhesive treatment liquid, wherein the treatment length of the root of the upper end of the membrane wire is 10cm, and the treatment length of the root of the lower end of the membrane wire is 6cm;
d. placing the soaked hollow fiber curtain type membrane assembly in a well-ventilated place for airing, volatilizing a solvent in the adhesive treatment solution, and finishing the repair of the damaged root of the membrane wire of the hollow fiber curtain type membrane assembly after the adhesive is cured.
The scanning electron microscope image of the surface of the membrane filament after the repair method for repairing the root damage of the membrane filament of the hollow fiber curtain type membrane assembly is similar to that of the embodiment 1, the damaged membrane layer and the exposed crocheted rope on the membrane filament are blocked by the adhesive, the adhesive on the surface layers of the damaged membrane layer and the exposed crocheted rope after treatment is completely cured, and the membrane filament is not adhered.
Comparative example 1
The repair method for the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly in the comparative example is a direct glue injection mode adopted by the inventor in the earlier stage, and as shown in fig. 6, the method specifically comprises the following steps: the first step is as follows: a cavity with sealed periphery is manufactured above a diaphragm capsule of the hollow fiber curtain type membrane component; the second step: directly injecting glue into the cavity; the third step: curing the injected glue; the fourth step: the mold cavity is removed.
The direct glue injection method can solve the problem of damaged membrane yarns, but the inventor finds that the membrane yarns repaired by the method have the following problems in the process of continuously using the membrane yarns repaired by the method: the membrane module can deposit hair, fiber, sludge and the like again at the position above the glue injection in the operation process, and the covered area of the membrane module has no water production function any more; for the rod curtain type membrane assembly, the membrane assembly needs to be vertically placed and processed in the processing process, and the membrane filaments are vertically gathered at the lower end due to the action of gravity; a new swing point is generated at the interface position of the glue injection, and the root membrane silk film layer is still damaged again after long-term operation; low treatment efficiency (long period), high cost and easy hole blockage, thereby causing large area loss.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications derived therefrom are intended to be within the scope of the invention.
Claims (2)
1. A method for repairing the damaged root of a membrane filament of a hollow fiber curtain type membrane component is characterized by comprising the following steps:
a. cleaning a hollow fiber curtain type membrane assembly, then purging, and enabling the water content of the hollow fiber curtain type membrane assembly to be not more than 5% after purging;
b. preparing an adhesive treatment liquid;
c. using the adhesive treatment liquid to perform infiltration treatment on the roots of the membrane filaments of the swept hollow fiber curtain-type membrane assembly, wherein the length of a treated area is 5% -20% of the length of the membrane filaments of the hollow fiber curtain-type membrane assembly; the upper end treatment length of the membrane filaments of the hollow fiber curtain type membrane component is 3-15cm, and the lower end treatment length of the membrane filaments of the hollow fiber curtain type membrane component is 3-8cm;
d. airing the immersed hollow fiber curtain type membrane assembly to cure the adhesive, and completing repair of the damaged root of the membrane filament of the hollow fiber curtain type membrane assembly;
the adhesive treating fluid comprises an adhesive and a diluent, wherein the mass ratio of the adhesive to the diluent is (0.5-10): 1; the adhesive is one or a mixture of more of polyurethane adhesive, acrylic resin adhesive, silicon rubber adhesive and epoxy resin adhesive; the diluent is one or a mixture of more of dichloromethane, acetone, ethyl acetate, dimethyl carbonate, dibasic ester, dioctyl adipate, D40 solvent oil, dimethylacetamide and gamma-butyrolactone.
2. The method for repairing the damaged root of the membrane filament of the hollow fiber curtain type membrane component according to claim 1, wherein: the specific method of the infiltration treatment is one or the combination of a plurality of soaking, spraying and brushing.
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| CN104888607A (en) * | 2015-06-15 | 2015-09-09 | 江苏鸿典投资股份有限公司 | Flat-plat membrane module and casting method thereof |
| CN206064177U (en) * | 2016-08-31 | 2017-04-05 | 北京碧水源膜科技有限公司 | A kind of U-shaped hollow fiber curtain type membrane component |
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| IL105875A (en) * | 1993-06-01 | 1998-04-05 | Aga Ab | Selective clogging of failed fibers |
| WO2006037234A1 (en) * | 2004-10-07 | 2006-04-13 | Zenon Environmental Inc. | Method of locating and repairing damaged hollow fiber modules and header assembly |
| CN100441277C (en) * | 2005-11-07 | 2008-12-10 | 中国科学院生态环境研究中心 | Curtain type hollow fiber membrane yarn end fastening technique |
| WO2014018031A1 (en) * | 2012-07-25 | 2014-01-30 | Empire Technology Development Llc | Graphene membrane repair |
| CN102897896B (en) * | 2012-09-29 | 2014-02-26 | 北京碧水源膜科技有限公司 | Tubular membrane bioreactor |
| CN106512740A (en) * | 2016-12-09 | 2017-03-22 | 天津碧水源膜材料有限公司 | Adhesive sealing method and packaging device for hollow fiber curtain type membrane element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104888607A (en) * | 2015-06-15 | 2015-09-09 | 江苏鸿典投资股份有限公司 | Flat-plat membrane module and casting method thereof |
| CN206064177U (en) * | 2016-08-31 | 2017-04-05 | 北京碧水源膜科技有限公司 | A kind of U-shaped hollow fiber curtain type membrane component |
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