CN108786474B - Water treatment system - Google Patents
Water treatment system Download PDFInfo
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- CN108786474B CN108786474B CN201710282327.6A CN201710282327A CN108786474B CN 108786474 B CN108786474 B CN 108786474B CN 201710282327 A CN201710282327 A CN 201710282327A CN 108786474 B CN108786474 B CN 108786474B
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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
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/18—Use of gases
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- Hydrology & Water Resources (AREA)
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- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a water treatment system which comprises a membrane component and a flushing component, wherein the membrane component is used for performing membrane filtration treatment on water to be treated, and the flushing component is coupled with the membrane component and is used for performing periodic air flushing and water flushing on the membrane surface of the membrane component through hot water and water respectively. Through the mode, the embodiment provided by the invention can delay the biotype pollution of the membrane in the membrane module.
Description
Technical Field
The invention relates to the field of water treatment, in particular to a water treatment system.
Background
The water treatment is to take physical, chemical, biological and other measures to make the water quality reach a certain use standard. The current common method is a physical method, and comprises the steps of removing impurities in water by using filter materials with different pore sizes and using an adsorption or blocking mode, so as to obtain cleaner water.
In recent years, membrane separation technology has been widely used in the field of water treatment due to its advantages of being novel, efficient, and broad-spectrum.
The inventor of the invention finds out in the long-term research process that the filtering membrane adopted in the membrane separation technology is easy to be polluted in the water treatment process, especially biological pollution, which directly causes irreversible damage to the filtering membrane and increases the operation cost of the system.
Disclosure of Invention
The invention mainly solves the technical problem of providing a water treatment system which can delay the biological pollution of a membrane.
In order to solve the technical problems, the invention adopts a technical scheme that: there is provided a water treatment system including a membrane module for performing a membrane filtration treatment on water to be treated, the water treatment system further including: and the flushing component is coupled with the membrane component and is used for periodically flushing the membrane surface of the membrane component with air and water through hot water and water respectively.
The invention has the beneficial effects that: different from the prior art, the water treatment system provided by the invention comprises a flushing component coupled with a membrane component, wherein the flushing component can perform periodic air flushing and water flushing on the membrane surface of the membrane component through hot water and water; on one hand, the invention uses hot air to carry out air blast on the surface of the membrane, so that the microbial activity on the surface of the membrane can be greatly reduced, the binding force between the microbes and the membrane is reduced, and the microbes deposited on the surface of the membrane are reduced, thereby delaying the biotype pollution of the membrane; on the other hand, the membrane surface is flushed by water in the invention, so that the pollutants on the membrane surface are in a suspended state, and the microorganisms deposited on the membrane surface are reduced, thereby delaying the biological pollution of the membrane.
Drawings
FIG. 1 is a schematic view of a water treatment system according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1, fig. 1 is a schematic structural diagram of an embodiment of a water treatment system according to the present invention, the water treatment system includes:
the membrane module 10: used for carrying out membrane filtration treatment on water to be treated; in one embodiment, a filtering membrane (not shown), such as a nanofiltration membrane, is horizontally disposed at the lower end of the membrane module 10, the water to be treated is located above the filtering membrane, and the relatively clean water filtered by the filtering membrane is discharged from below the filtering membrane, in other embodiments, the position and the type of the filtering membrane in the membrane module 10 may be other.
A flushing component 12 coupled with the membrane component 10 for periodically flushing the membrane surface of the membrane component 10 with hot water and water, respectively; specifically, the flushing assembly 12 includes:
the multifunctional storage tank body 120 is arranged at a position higher than the membrane module 10 in the vertical direction, and comprises a tank main body 1200 and a sealing cover 1202 movably and hermetically arranged on the tank main body 1200, and the multifunctional storage tank body 120 is used for respectively containing hot air and water to be treated at different time periods; specifically, since the sealing cover 1202 is movable, air and water to be treated can enter the tank main body 1200 from the sealing cover 1202 during different periods of time; when the multi-functional reservoir body 120 contains water to be treated, the water to be treated may spontaneously flow toward the membrane module 10 under the influence of its gravity, since its vertical position is higher than the membrane module 10.
A piston assembly 122 including a piston 1220 and a piston pipe 1222, the piston assembly 122 being disposed at the same level as the membrane module 10 and coupled with the membrane module 10 and the multi-functional reservoir body 120, respectively, for providing power to enable the hot air and/or the water to be treated in the multi-functional reservoir body 120 to perform air-washing and/or water-washing on the membrane surface of the membrane module 10 at a predetermined period; in one embodiment, the piston 1220 is hollow, such as with a hole in the middle, so that the piston 1220 does not obstruct the flow of hot air or water to be treated when the hot air or water is present in the piston tube 1222.
A first conduit 124 disposed between the multi-function reservoir body 120 and the piston assembly 122 to connect the multi-function reservoir body 120 and the piston assembly 122; specifically, the first pipe 124 includes a first sub-pipe 124a and a second sub-pipe 124B, the first sub-pipe 124a and the second sub-pipe 124B are respectively disposed between the multifunctional reservoir body 120 and the piston assembly 122 in bilateral symmetry so as to symmetrically connect the multifunctional reservoir body 120 and the piston assembly 122, and the first sub-pipe 124a and the second sub-pipe 124B are respectively provided with a first valve a and a second valve B at one end close to the multifunctional reservoir body 120; in one embodiment, the first/second sub-conduits 124 a/124 b are coupled to the bottom of the multi-function reservoir body 120 at one end and to the piston conduit 1222 at the other end, thereby enabling connection of the multi-function reservoir body 120 to the piston assembly 122, in other embodiments, in other ways.
A second pipe 126 disposed between the piston assembly 122 and the diaphragm assembly 10 to connect the piston assembly 122 and the diaphragm assembly 10; specifically, the second pipe 126 includes a third sub-pipe 126a and a fourth sub-pipe 126b, the third sub-pipe 126a and the fourth sub-pipe 126b are respectively disposed between the piston assembly 122 and the membrane assembly 10 in a left-right symmetrical manner to symmetrically connect the piston assembly 122 and the membrane assembly 10, and the third sub-pipe 126a and the fourth sub-pipe 126b are respectively provided with a third valve C and a fourth valve D at one end near the membrane assembly 10; in one embodiment, one end of the third/fourth sub-pipe 126 a/126 b is coupled to one side of the diaphragm assembly 10, and the other end is coupled to the piston pipe 1222, so as to connect the diaphragm assembly 10 to the piston assembly 122, in other embodiments, in other manners.
In other embodiments, when the multi-functional reservoir body 120 is filled with hot air, in order to control the temperature of the hot air, the above-mentioned flushing assembly 12 further includes: a temperature control device 128, wherein the temperature control device 128 comprises a temperature detecting element 1280, a heating element 1282 and a control element 1284, one end of the temperature detecting element 1280 and one end of the heating element 1282 are located inside the multifunctional reservoir body 120 and close to the first pipe 124, and the other end of the temperature detecting element 1280 and the other end of the heating element 1282 are connected with the control element 1284; in one embodiment, the control element 1284 controls the temperature of the hot air inside the multi-functional reservoir body 120 to be 45-50 ℃, such as 45 ℃, 48 ℃, 50 ℃, etc., and in other embodiments, other temperature ranges are possible; to control the temperature more accurately, the temperature detecting element 1280 and the heating element 1282 should be as close to the first sub-pipe 124a or the second sub-pipe 124b as possible, because the temperature of the hot air flowing out from the first sub-pipe 124a or the second sub-pipe 124b can be controlled more precisely.
In other embodiments, in order to increase the automation level of the water treatment system, the flushing assembly 12 further comprises an air compressor 121 and a time control switch 123; wherein, the air compressor 121 is connected to the piston assembly 122 for continuously providing power to the piston assembly 122, and in an application scenario, the air compressor 121 is coupled to one end of the piston 1220 of the piston assembly 122 for providing power to the piston 1220; the time control switch 123 is connected to the air compressor 121 and is used for periodically setting the movement of the piston 1220, that is, the time control switch 123 controls the working frequency of the air compressor 121 and further controls the movement speed of the piston 1220, thereby improving the automation level of the water treatment system.
In other embodiments, in order to monitor the filtering performance of the filtering membrane in the membrane module 10, the water treatment system further includes an electronic balance 14, where the electronic balance 14 is connected to the membrane module 10 and is used for monitoring the weight change of the water filtered by the membrane module 10, so as to monitor the filtering performance of the membrane; in an application scenario, the electronic balance 14 is disposed at a water outlet of the membrane module 10, and can reflect the current membrane flux of the filtering membrane in the membrane module 10 by detecting the mass of the outlet water within a certain time; specifically, assuming that the effective area of the filtering membrane is a and the sampling period time is T, the electronic balance 14 refers to the mass M of the filtered relatively clean fresh water during the sampling period T, and the membrane flux J of the current filtering membrane can be obtained by using the formula J ═ M/(T × a × ρ) (where ρ is the density of water), and the membrane flux J is proportional to the mass M, so that the membrane flux condition of the current filtering membrane can be monitored by monitoring the mass M of the water through the electronic balance 14.
With continuing reference to fig. 1, the operation of the water treatment system will be further described with reference to specific application scenarios.
Assuming a total filtration cycle time T1, e.g., 2h, 3h, etc., the operation of the water treatment system includes the following steps:
A. hot air blast process:
(a) the first valve a, the second valve B, the third valve C and the fourth valve D are closed, the sealing cover 1202 of the multifunctional storage tank body 120 is moved and then sealed, and at this time, the multifunctional storage tank body 120 is filled with air;
(b) the temperature control device 128 is operated to maintain the temperature of the heated air in the multi-functional reservoir body 120 at 47 ± 1 ℃, and in other embodiments, the temperature of the heated air may be controlled to be other temperatures;
(c) the third valve C and the fourth valve D are opened, and one of the first valve a and the second valve B is opened and the other is closed, in one embodiment, if the temperature control device 128 is arranged near the first valve a, the first valve a is opened and the second valve B is closed, and if the temperature control device 128 is arranged near the second valve B, the second valve B is opened and the first valve a is closed, so that the temperature control of the flowing hot air is more accurate; the air pressure inside the multifunctional storage tank body 120 is higher than the external atmospheric pressure due to the temperature rise, and when the valve is opened, the hot air inside the multifunctional storage tank body flows from the place with high atmospheric pressure to the place with relatively low atmospheric pressure until the atmospheric pressures on the two sides are equal; when the first valve a is opened and the second valve B is closed, the hot air in the multifunctional storage tank body 120 enters the membrane module 10 through the first sub-pipeline 124a, the piston pipeline 1222 and the third sub-pipeline 126a or the fourth sub-pipeline 126B, and the membrane surface of the filtering membrane is subjected to hot air flushing; when the first valve a is closed and the second valve B is opened, the hot air in the multifunctional storage tank body 120 enters the membrane module 10 through the second sub-pipeline 124B, the piston pipeline 1222 and the third sub-pipeline 126a or the fourth sub-pipeline 126B, and the membrane surface of the filtering membrane is subjected to hot air blast; the hot air impact on the surface of the filtering membrane can greatly reduce the activity of microorganisms on the surface of the membrane, reduce the binding force between the microorganisms and the membrane, and reduce the microorganisms deposited on the surface of the membrane, thereby delaying the biotype pollution of the membrane;
B. the water to be treated enters the process:
the first valve a, the second valve B, the third valve C and the fourth valve D are closed, the sealing cap 1202 of the multifunctional storage tank body 120 is moved, after the water to be treated with a predetermined volume is introduced into the multifunctional storage tank body 120, the multifunctional storage tank body 120 is sealed, and at this time, the water to be treated is contained in the multifunctional storage tank body 120;
C. a first filtration process:
the piston 1220 is located at the rightmost end of the piston pipeline 1222, the first valve a and the fourth valve D are opened, the second valve B and the third valve C are closed, the water to be treated in the multifunctional storage tank body 120 flows into the membrane module 10 through the first sub-pipeline 124a, the piston pipeline 1222 and the fourth sub-pipeline 126B under the action of gravity, the membrane module 10 filters the water to be treated, and at this time, the liquid in the membrane module 10 flows in the direction from the fourth valve D to the third valve C;
D. a first water flushing process:
the first valve a and the fourth valve D are continuously opened, the second valve B and the third valve C are continuously closed, the piston 1220 moves from the rightmost end of the piston pipeline 1222 to the leftmost end of the piston pipeline 1222, the water to be treated in the membrane module 10 overcomes the gravity to do work under the suction effect of the piston 1220, and flows into the multifunctional reservoir body 120 through the fourth sub-pipeline 126B, the piston pipeline 1222 and the first sub-pipeline 124a, so as to flush the membrane surface of the membrane module 10, and at this time, the liquid in the membrane module 10 flows in the direction from the third valve C to the fourth valve D, which is opposite to the flow direction of the first filtering process in the step C;
E. and (3) a second filtering process:
the piston 1220 is located at the leftmost end of the piston pipeline 1222, the first valve a and the fourth valve D are closed, the second valve B and the third valve C are opened, the water to be treated in the multifunctional reservoir body 120 flows into the membrane module 10 through the second sub-pipeline 124B, the piston pipeline 1222 and the third sub-pipeline 126a under the action of potential energy, the membrane module 10 filters the water to be treated, and at this time, the liquid flow in the membrane module 10 is in the direction from the third valve C to the fourth valve D;
F. and a second water flushing process:
the first valve a and the fourth valve D are continuously closed, the second valve B and the third valve C are continuously opened, the piston 1220 moves from the leftmost end of the piston pipeline 1222 to the rightmost end of the piston pipeline 1222, the water to be treated in the membrane module 10 overcomes potential energy under the suction action of the piston 1220, flows into the multifunctional reservoir body 120 through the third sub-pipeline 126a, the piston pipeline 1222 and the second sub-pipeline 124B, and further performs water flushing on the membrane surface of the membrane module 10, and at this time, the liquid in the membrane module 10 flows to the direction from the fourth valve D to the third valve C, which is opposite to the second filtering process;
G. repeating the C, D, E, F process until the whole filtering period is finished; through the process of inserting water flushing in the filtering process, pollutants on the surface of the membrane can be in a suspended state, so that microorganisms deposited on the surface of the membrane are reduced, and the biotype pollution of the membrane is delayed; in other embodiments, after a filtration cycle is completed or after the current membrane flux of the filtration membrane measured by electronic balance 14 drops beyond a threshold value, the filtration membrane in membrane module 10 can be removed and cleaned with distilled water and chemical solution.
In another embodiment, before the step C, a preset process is further included, and the time control switch 123 controls the operating frequency of the air compressor 121, and further controls the moving speed of the piston 1220, so that the time of the first filtering process and the second filtering process is a first time, and the time of the first water flushing process and the second water flushing process is a second time, wherein the sum of the first time and the second time is 30-180 seconds, such as 30, 80, 100, 150, 180 seconds, and the second time is 1-7 seconds; such as 1, 5, 7 seconds, etc.
In another embodiment, in step C, i.e. the first filtering process, the piston 1220 may be further located at the leftmost end of the piston pipe 1222, and the processing sequence in the processing process is as follows: A-B-E-F-C-D-G.
In summary, unlike the state of the art, the present invention provides a water treatment system comprising a flushing assembly coupled to a membrane module, the flushing assembly being capable of performing periodic air and water flushing of a membrane surface of the membrane module by means of hot water and water; on one hand, the invention uses hot air to carry out air blast on the surface of the membrane, so that the microbial activity on the surface of the membrane can be greatly reduced, the binding force between the microbes and the membrane is reduced, and the microbes deposited on the surface of the membrane are reduced, thereby delaying the biotype pollution of the membrane; on the other hand, the membrane surface is flushed by water in the invention, so that the pollutants on the membrane surface are in a suspended state, and the microorganisms deposited on the membrane surface are reduced, thereby delaying the biological pollution of the membrane.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. A water treatment system comprising a membrane module for performing a membrane filtration process on water to be treated, the water treatment system further comprising a flush assembly coupled to the membrane module, the flush assembly comprising:
the multifunctional storage tank body is arranged at a position higher than the membrane component in the vertical direction, and comprises a tank main body and a sealing cover movably and hermetically arranged on the tank main body, and the multifunctional storage tank body is used for respectively containing hot air and the water to be treated at different time periods;
the piston assembly comprises a piston and a piston pipeline, the piston assembly is arranged at the position on the same horizontal plane with the membrane assembly and is respectively coupled with the membrane assembly and the multifunctional storage tank body, and the piston is made of hollow materials;
a first conduit disposed between the multi-functional accumulator body and the piston assembly to connect the multi-functional accumulator body and the piston assembly;
a second conduit disposed between the piston assembly and the diaphragm assembly to connect the piston assembly and the diaphragm assembly;
the piston can reciprocate periodically to change the flow direction of the hot air and/or the water to be treated in a driving mode, so that the hot air and/or the water to be treated can carry out air flushing and/or water flushing on the membrane surface of the membrane module at a preset period.
2. The water treatment system of claim 1, wherein the first conduit comprises a first sub-conduit and a second sub-conduit, the first sub-conduit and the second sub-conduit are respectively symmetrically disposed between the multi-functional reservoir body and the piston assembly to symmetrically connect the multi-functional reservoir body and the piston assembly, the first sub-conduit and the second sub-conduit are respectively provided with a first valve and a second valve at an end adjacent to the multi-functional reservoir body;
the second pipeline comprises a third sub-pipeline and a fourth sub-pipeline, the third sub-pipeline and the fourth sub-pipeline are respectively arranged between the piston assembly and the membrane assembly in a bilateral symmetry mode to symmetrically connect the piston assembly and the membrane assembly, and a third valve and a fourth valve are respectively arranged at one end, close to the membrane assembly, of the third sub-pipeline and one end, close to the membrane assembly, of the fourth sub-pipeline.
3. The water treatment system of claim 1, wherein the flush assembly further comprises:
the temperature control device comprises a temperature detection element, a heating element and a control element, wherein the temperature detection element and one end of the heating element are located inside the multifunctional storage tank body and close to the first pipeline, and the other end of the temperature detection element and the other end of the heating element are connected with the control element.
4. The water treatment system of claim 1, further comprising:
and the electronic balance is connected with the membrane component and is used for monitoring the weight change of the water filtered by the membrane component so as to monitor the filtering performance of the membrane.
5. The water treatment system of claim 1, wherein the flush assembly further comprises:
and the air compressor is connected with the piston assembly and used for continuously providing power for the piston assembly.
6. The water treatment system of claim 5 wherein the flushing assembly further comprises a time controlled switch connected to the air compressor for periodically setting the piston movement.
7. The water treatment system of claim 2, wherein when the multi-functional reservoir body contains hot air, one of the first valve and the second valve is closed, and the third valve and the fourth valve are opened, the hot air in the multi-functional reservoir body enters the membrane module through the first sub-pipe, the piston pipe, the third sub-pipe and the fourth sub-pipe, or the hot air in the multi-functional reservoir body enters the membrane module through the second sub-pipe, the piston pipe, the third sub-pipe and the fourth sub-pipe, thereby air-flushing the membrane surface of the filtering membrane.
8. The water treatment system of claim 7, wherein when the multi-functional reservoir body contains the water to be treated, a cycle is completed through a first filtering process, a first water flushing process, a second filtering process, and a second water flushing process, and the cycle is repeated until a filtering period is completed; wherein the content of the first and second substances,
in the first filtering process, the piston is positioned at the rightmost end of the piston pipeline, the first valve and the fourth valve are opened, the second valve and the third valve are closed, the water to be treated in the multifunctional reservoir body flows into the membrane module through the first sub-pipeline, the piston pipeline and the fourth sub-pipeline, and the membrane module filters the water to be treated;
in the first water flushing process, the first valve and the fourth valve are continuously opened, the second valve and the third valve are continuously closed, the piston moves from the rightmost end of the piston pipeline to the leftmost end of the piston pipeline, the water to be treated in the membrane module flows into the multifunctional storage tank body through the fourth sub-pipeline, the piston pipeline and the first sub-pipeline, and then the membrane surface of the membrane module is flushed with water;
in the second filtering process, the piston is positioned at the leftmost end of the piston pipeline, the first valve and the fourth valve are closed, the second valve and the third valve are opened, the water to be treated in the multifunctional storage tank body flows into the membrane module through the second sub-pipeline, the piston pipeline and the third sub-pipeline, and the membrane module filters the water to be treated;
in the second water flushing process, the first valve and the fourth valve are continuously closed, the second valve and the third valve are continuously opened, the piston moves from the leftmost end of the piston pipeline to the rightmost end of the piston pipeline, the water to be treated in the membrane module flows into the multifunctional storage tank body through the third sub-pipeline, the piston pipeline and the second sub-pipeline, and then the membrane surface of the membrane module is flushed with water.
9. The water treatment system of claim 8, wherein the first and second filtering processes are performed for a first time and the first and second water flush processes are performed for a second time, wherein the sum of the first and second times is 30-180 seconds and the second time is 1-7 seconds.
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| CN201710282327.6A CN108786474B (en) | 2017-04-26 | 2017-04-26 | Water treatment system |
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| US10646828B2 (en) * | 2014-05-08 | 2020-05-12 | Georgia Tech Research Corporation | Cyclic filtration system |
| CN106379963A (en) * | 2016-11-14 | 2017-02-08 | 河南锦源环保科技有限公司 | Air-liquid resonant filtering device with tubular membrane and using method of air-liquid resonant filtering device |
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| US6485649B1 (en) * | 1997-11-12 | 2002-11-26 | Steris Europe, Inc. | Method and device for the production of pure water |
| CN202237816U (en) * | 2011-08-18 | 2012-05-30 | 郑州银科尔科技有限公司 | Efficient self-cleaning membrane separation and purification device |
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