KR101923711B1 - Filtration module for reducing fouling of membrane by rotating disk of centrifugal pump and method using the same - Google Patents
Filtration module for reducing fouling of membrane by rotating disk of centrifugal pump and method using the same Download PDFInfo
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- KR101923711B1 KR101923711B1 KR1020170047269A KR20170047269A KR101923711B1 KR 101923711 B1 KR101923711 B1 KR 101923711B1 KR 1020170047269 A KR1020170047269 A KR 1020170047269A KR 20170047269 A KR20170047269 A KR 20170047269A KR 101923711 B1 KR101923711 B1 KR 101923711B1
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- filtration module
- centrifugal pump
- membrane
- separation membrane
- rotating body
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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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- 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
- B01D65/08—Prevention of membrane fouling or of concentration polarisation
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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
- B01D2321/20—By influencing the flow
- B01D2321/2033—By influencing the flow dynamically
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- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a filtration module in which fouling of a separation membrane is reduced by a rotating body of a centrifugal pump, and a separation method using the filtration module, and more particularly to a filtration module for filtering solid matter in raw water containing solid matter, By connecting the centrifugal pump directly to the filtration module, the centrifugal pump rotates the raw water in the filtration module and solves the fouling problem of the solid material blocking the separation membrane in the separation process, thereby improving filtration performance. To a filtration module in which fouling of a separation membrane is reduced by a rotating body and a separation method using the filtration module.
The filtration module according to the present invention is a filtration module that can circulate raw water in a filtration module by only centrifugal pump without adding an additional electric motor through a centrifugal pump that can be used as an inflow pump and can effectively increase shear force on the surface of the separation membrane. In which the separation membrane is provided in front of the rotating body of the centrifugal pump as an inflow pump so that the shear force at the surface of the separation membrane is effectively improved by the rotating body and the inlet of raw water is arranged at the center of the separation membrane, So that the pressure difference between the membranes can be effectively generated. Therefore, it is possible to simultaneously achieve the circulation of the raw water and the improvement of the shearing force by using only the centrifugal pump, and the fouling of the membrane can be effectively reduced.
Description
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a filtration module in which fouling of a separation membrane is reduced by a rotating body of a centrifugal pump, and a separation method using the filtration module, and more particularly to a filtration module for filtering solid matter in raw water containing solid matter, By connecting the centrifugal pump directly to the filtration module, the centrifugal pump rotates the raw water in the filtration module and solves the fouling problem of the solid material blocking the separation membrane in the separation process, thereby improving filtration performance. To a filtration module in which fouling of a separation membrane is reduced by a rotating body and a separation method using the filtration module.
Water is an indispensable resource for all human economic, social and cultural activities. However, due to population increase, rapid increase of water consumption due to industrialization, and water pollution caused by environmental pollution, the water shortage situation is getting worse each year.
In the summer when the water temperature rises, reservoirs, lakes, fisheries, offshore waters or running water are also producing green tides or red tides. These green algae or red tide not only destroy fishes in the lake or sea farm, but also aquatic plants, causing destruction of ecological environment as well as bad odors.
In general, algae phenomenon is caused by eutrophicated lakes or floodplains (phytoplankton) in a slow stream, which are accumulated on the surface of water and change the color of the water remarkably to green. It is known that the cause of the algae phenomenon is adversely affecting aquatic plants by the toxic cyanobacteria. For example, it causes serious problems such as the effects of toxins on human body and livestock, ecological problems caused by ecosystem destruction, fish deficiency due to oxygen deficiency and various kinds of aquatic organisms.
In addition, the red tide phenomenon refers to the phenomenon that the color of the seawater changes in red color due to the proliferation of a large amount of phytoplankton. When the creature causing red tide is caused by the ciliate or diatoms classified as euglena or protozoa The red tide phenomenon has recently been shown widely in the southern coast of Korea, the west sea, and the southern coast of the East Sea, and the red tide creatures are moving from the center of the diatoms to the center of the flagellated tide, Due to this trend, red tide damage is increasing every year.
In recent years, such rust and red tide phenomenon has occurred as a characteristic of wide area, toxicity, and prolongation, and development of technology for solving this is urgently required.
Separation membrane filtration is a liquid-solid separation technique in which raw water in raw water containing solid matter is filtered by a porous separation membrane and raw water having passed through the porous separation membrane is discharged into clean treated water. The material is adhered to the surface of the separator or to the inside of the pore, thereby reducing or eliminating the size of the pore, thereby drastically lowering the solid-liquid separating ability of the separator. The most effective method among the various methods proposed to solve the problem of the separation membrane contamination by the solid material is to increase the shear stress at the surface of the membrane.
Cross-flow filtration, which is widely used, circulates the raw water to the separation membrane through the inlet pump, thereby providing the trans-membrane pressure, which is the driving force of the membrane filtration technology, and at the same time, The shear force can be increased, but the effect of reducing the membrane fouling due to this is insufficient. The shear force can be significantly increased by additionally providing a rotating body and a separate electric motor for rotating the rotating body on the surface of the separator. In this way, the fouling phenomenon, which is the accumulation of solids on the surface of the membrane, can be significantly reduced and the filtration performance can be effectively increased. However, in addition to the operation of the inlet pump, an electric motor of the rotating body must be additionally installed.
The present inventors have made intensive efforts to develop a filtration module having excellent separation membrane fouling reduction effect by a solid material. As a result, they have found that a separation membrane is provided in front of the rotating body of a centrifugal pump, so that a separate centrifugal pump, It was confirmed that the raw water can be circulated in the filtration module with the centrifugal pump alone and at the same time the shearing force on the surface of the separation membrane can be effectively increased and the fouling of the separation membrane can be effectively reduced without complicating the present invention .
It is an object of the present invention to provide a filtration module having an excellent effect of reducing separation membrane fouling by a solid material.
It is another object of the present invention to provide a method for separating solid matter of influent water using the filtration module.
In order to achieve the above object, an inflow water supply means (A) provided at a lower central portion of a filtration module; A concentrated solid material discharging means (B) provided at an upper portion of the filtration module; A filtered process water discharge means (C) provided at a lower end of the filtration module; A rotating body of a centrifugal pump including a rotating disk (10) and a rotating shaft (20); And a separation membrane (30) provided at both ends of a lower portion of the filtration module in a direction parallel to the rotary disk to filter the solid material contained in the influent water. The separation membrane (30) Can be reduced.
The present invention also provides a solid-liquid separation method using the filtration module.
The filtration module according to the present invention is a filtration module that can circulate raw water in a filtration module by only centrifugal pump without adding an additional electric motor through a centrifugal pump that can be used as an inflow pump and can effectively increase shear force on the surface of the separation membrane. In which the separation membrane is provided in front of the rotating body of the centrifugal pump as an inflow pump so that the shear force at the surface of the separation membrane is effectively improved by the rotating body and the inlet of raw water is arranged at the center of the separation membrane, So that the pressure difference between the membranes can be effectively generated. Therefore, it is possible to simultaneously achieve the circulation of the raw water and the improvement of the shearing force by using only the centrifugal pump, and the fouling of the membrane can be effectively reduced.
1 is a schematic diagram illustrating a filtration module using a rotating body of a centrifugal pump according to an embodiment of the present invention.
FIG. 2 is a graph showing a comparison of filtration speeds according to operation strengths of a centrifugal pump using a filtration module according to an embodiment of the present invention.
FIG. 3 is a graph showing a comparison of fouling resistance values according to operation intensity of a centrifugal pump using a filtration module according to an embodiment of the present invention.
The present invention can be all accomplished by the following description. It is to be understood that the following description is only illustrative of preferred embodiments of the invention, but the invention is not necessarily limited thereto. It is to be understood that the accompanying drawings are included to provide a further understanding of the invention and are not to be construed as limiting the present invention. The details of the individual components may be properly understood by reference to the following detailed description of the related description.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In general, the nomenclature used herein is well known and commonly used in the art.
In the present invention, in order to remarkably reduce the fouling phenomenon caused by the accumulation of solids on the surface of the separation membrane, it is possible to use a rotary pump and a separate electric motor for rotating the pump, The shear force at the surface of the separation membrane can be effectively increased by providing the separation membrane in front of the rotating body of the centrifugal pump so that the shear force at the surface of the separation membrane can be effectively improved by the rotating body, The raw water is effectively sucked and circulated by the rotating body so that the inter-membrane pressure difference is generated. Therefore, the circulation and the shearing force of the raw water can be simultaneously improved by only the centrifugal pump.
Accordingly, the present invention provides, in one aspect, inflow water supply means (A) provided at the lower central portion of the filtration module; A concentrated solid material discharging means (B) provided at an upper portion of the filtration module; A filtered process water discharge means (C) provided at a lower end of the filtration module; A rotating body of a centrifugal pump including a rotating disk (10) and a rotating shaft (20); And a separation membrane (30) provided at both ends of a lower portion of the filtration module in a direction parallel to the rotary disk to filter the solid material contained in the influent water. The separation membrane (30) To a filtration module.
FIG. 1 is a schematic view of a filtration module using a rotating body of a centrifugal pump according to an embodiment of the present invention. The filtration module includes an influent supply means A for introducing raw water, a solid material discharging means B for discharging concentrated solid material, And a process water discharging means (C) for discharging the filtered process water. The
More specifically, the centrifugal pump is equipped with a filtration module capable of providing a separation membrane, and the raw water is introduced from the lower center portion of the filtration module through the rotation of the rotation body, (A) (C), the filtration rate can be improved by effectively reducing the fouling through the flow of high shear force at the surface of the separation membrane formed by the rotating body.
In the present invention, the
In the present invention, the
In another aspect, the present invention relates to a solid-liquid separation method using the filtration module.
In the present invention, it is preferable that the rotating body of the centrifugal pump includes a step of circulating the influent water in the filtration module and a step of increasing the shear force on the surface of the separation membrane.
In an embodiment of the present invention, the operation intensity of the centrifugal pump can be adjusted to 0 to 100% according to the maximum power consumption of the centrifugal pump to be applied. However, if the operation strength is too weak, it takes a long time to process the influent water because the filtration speed is slow, and when the operation strength is more than a certain level, there is not much change in the fouling.
Hereinafter, the present invention will be described in more detail by way of examples. It will be apparent to those skilled in the art that these embodiments are merely illustrative of the present invention and that the technical scope of the present invention is not limited to these embodiments.
Example 1: Centrifugal pump In the driving century Comparison of Filtration Rate
In this example, the filtration rate in the steady-state was observed according to the operation intensity of the centrifugal pump based on the concentration of the microalgae cultured in the open pond (0.5 g / L), and the membrane used in the experiment was PVDF Polyvinylidene fluoride Material A microfiltration (MF) membrane with a pore size of 0.2 μm and an ultrafiltration (UF) membrane with a pore size of 150 kDa made of a PES (Polyethersulfone) material were used.
By driving the centrifugal pump, the operation intensity of the pump can be adjusted between 0 and 100%. As a result, the amount of power supplied to the centrifugal pump and the rotational speed of the centrifugal pump are changed, The circulating flow rate of raw water and the operating pressure (TMP) of the separator were changed, and the circulating flow rate and TMP of the raw water were kept the same when the operation strength was kept the same. However, if the operation intensity is at least 50%, the circulation of the raw water is started, and if the operation intensity is increased from 50% to 100%, the circulating flow of raw water is changed from 8 L / min to 17 L / min, kPa, respectively. In the microalgae filtration experiment, the operation intensity of the centrifugal pump was operated under five conditions (50%, 67%, 83%, 92%, 100%).
As a result, the circulation of the raw water started at a centrifugal pump operating intensity of 50% or more, so the membrane filtration operation also started at this time and the treated water began to come out. And, the minimum operating intensity of the filtration rate at 50% is 100 L / m 2 / h (treated per membrane 1m operating time per 21 hours flow rate) as shown in Figure 2, the filtration velocity increases as the driving strength is increased The filtration speed was improved by 650% for MF and 760% for UF when the filtration rate was 100% compared to the minimum operating filtration rate of 50%.
Example 2: Centrifugal pump In the driving century Following Foul ring Resistance value comparison
In this example, the fouling on the surface of the membrane at steady-state was evaluated quantitatively based on the concentration of microalgae cultured in open pond (0.5 g / L), and the experimental conditions were the same as in Example 1 .
As shown in FIG. 3, the fouling of the MF decreased by 48.6% and the fouling of the UF decreased by 80.8% while the driving strength increased from 50% to 83%. Also, as the rotating speed of the rotating body increases, the shear force on the surface of the separator increases, and the flow rate of the raw water circulating in the filtration module increases, and the operating pressure (TMP) of the separator increases. As the TMP increases, the filtration speed increases. As a result, the rotating speed of the rotating body increases as the operating strength increases. As a result, the shear force at the surface of the membrane is improved to reduce the fouling, and at the same time, the circulating flow rate of the raw water in the filtration module increases, Due to the two effects, it was confirmed that the filtration rate was drastically improved in the range of 50% to 83% of the driving strength.
On the other hand, there is no significant change in the fouling from 83% to 100% of the driving strength. As the TMP increases, the fouling generation rate also increases. In this section, the fouling removal rate due to the rotating body and the fouling generation rate due to the increase in TMP It seems to be similar. Therefore, it was found that the filtration rate was increased only by the TMP increase effect, and the increase rate was slower than the 50% to 83% interval, as compared with the 50% to 83% I could.
Therefore, both the MF and the UF increase as the centrifugal pump operation speed increases, that is, as the rotation speed of the centrifugal pump increases, 50% to 83% increase the TMP and improve the fouling reduction effect. From 100% to 100%, the filtration speed was improved by only increasing the TMP increase effect, and the increase of the operation strength by more than 83% was considered to be the most efficient when the operation strength of the centrifugal pump was 83% because the filtration speed improvement was insufficient.
In addition, the microalgae concentrations of raw water and treated water were measured by optical density (OD) 682nm using a UV-Vis spectrophotometer. As a result, the OD 682mn of the feed was 1.4 and the OD 682nm of the treated water was 0.2um of PVDF 0.010 for PES and 0.001 for PES 150kDa. Therefore, the removal rates of PVDF 0.2um and PES 150kDa were 99.3% and 99.9%, respectively, and it was confirmed that 99% of the microalgae contained in the raw water were removed from both membranes.
While the present invention has been particularly shown and described with reference to specific embodiments thereof, those skilled in the art will readily appreciate that many modifications are possible, will be. Accordingly, the actual scope of the present invention will be defined by the appended claims and their equivalents.
100: Filtration module
10: Rotational disk
20: Rotational shaft
30: Membrane
A: Influent supply means
B: means for discharging suspended matter
C: treated water discharge means
Claims (5)
A concentrated solid matter discharge means (B) provided on the upper part of the filtration module (100);
A filtered process water discharge means C provided at a lower end of the filtration module 100;
A rotating body of a centrifugal pump including a rotating disk (10) and a rotating shaft (20); And
And a separation membrane (30) provided at both ends of a lower portion of the filtration module in a direction parallel to the rotary disk to filter the solid material contained in the influent water,
The filtration module is directly coupled to the rotating body of the centrifugal pump,
Raw water flows into the influent water supply means A through the rotation of the centrifugal pump and the raw water is circulated in the filtration module 100 while escaping to the concentrated solid matter discharge means B, The water is discharged to the water discharging means (C)
The filtration module is capable of reducing the fouling of the separation membrane (30) by increasing the shear force by the rotating body of the centrifugal pump.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020170047269A KR101923711B1 (en) | 2017-04-12 | 2017-04-12 | Filtration module for reducing fouling of membrane by rotating disk of centrifugal pump and method using the same |
| PCT/KR2018/004299 WO2018190654A1 (en) | 2017-04-12 | 2018-04-12 | Filtering module with reduced fouling of separation membrane due to rotor of centrifugal pump, and separation method using same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020170047269A KR101923711B1 (en) | 2017-04-12 | 2017-04-12 | Filtration module for reducing fouling of membrane by rotating disk of centrifugal pump and method using the same |
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| Publication Number | Publication Date |
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| KR20180115086A KR20180115086A (en) | 2018-10-22 |
| KR101923711B1 true KR101923711B1 (en) | 2018-11-29 |
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| KR1020170047269A KR101923711B1 (en) | 2017-04-12 | 2017-04-12 | Filtration module for reducing fouling of membrane by rotating disk of centrifugal pump and method using the same |
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| WO (1) | WO2018190654A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100785815B1 (en) | 2006-11-16 | 2007-12-13 | 서울산업대학교 산학협력단 | Tubular membrane module and system equipped reciprocated and rotated suction tubing for continuous cleaning |
| JP2009148673A (en) * | 2007-12-19 | 2009-07-09 | Sekisui Chem Co Ltd | Membrane separation apparatus and desalination method |
| WO2009155234A2 (en) | 2008-06-17 | 2009-12-23 | Bio-Rad Laboratories, Inc. | Centrifugal force-based system for detection/treatment of membrane-encased structures |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4626345A (en) * | 1984-09-04 | 1986-12-02 | Lenox Institute For Research, Inc. | Apparatus for clarification of water |
| US5143630A (en) * | 1991-05-30 | 1992-09-01 | Membrex, Inc. | Rotary disc filtration device |
| KR100274536B1 (en) * | 1998-05-20 | 2000-12-15 | 한상배 | Filter apparatus and filtering methods with self priming and back fresh function |
| KR101660310B1 (en) * | 2015-02-26 | 2016-10-10 | (주)성창기공수처리공사 | Apparatus and method for filtering having spring type filter connected pump |
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2017
- 2017-04-12 KR KR1020170047269A patent/KR101923711B1/en active IP Right Grant
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2018
- 2018-04-12 WO PCT/KR2018/004299 patent/WO2018190654A1/en active Application Filing
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100785815B1 (en) | 2006-11-16 | 2007-12-13 | 서울산업대학교 산학협력단 | Tubular membrane module and system equipped reciprocated and rotated suction tubing for continuous cleaning |
| JP2009148673A (en) * | 2007-12-19 | 2009-07-09 | Sekisui Chem Co Ltd | Membrane separation apparatus and desalination method |
| WO2009155234A2 (en) | 2008-06-17 | 2009-12-23 | Bio-Rad Laboratories, Inc. | Centrifugal force-based system for detection/treatment of membrane-encased structures |
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| Publication number | Publication date |
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| KR20180115086A (en) | 2018-10-22 |
| WO2018190654A1 (en) | 2018-10-18 |
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