JP4433553B2 - Cleaning method for spiral membrane module - Google Patents

Cleaning method for spiral membrane module Download PDF

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Publication number
JP4433553B2
JP4433553B2 JP2000076632A JP2000076632A JP4433553B2 JP 4433553 B2 JP4433553 B2 JP 4433553B2 JP 2000076632 A JP2000076632 A JP 2000076632A JP 2000076632 A JP2000076632 A JP 2000076632A JP 4433553 B2 JP4433553 B2 JP 4433553B2
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Japan
Prior art keywords
membrane module
container
water
cleaning
membrane
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JP2000076632A
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Japanese (ja)
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JP2001259384A (en
Inventor
辰郎 中司
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栗田工業株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for efficiently washing a spiral membrane module used in a membrane separation device such as a microfiltration device, an ultrafiltration device, or a reverse osmosis membrane separation device.
[0002]
[Prior art]
As a membrane module loaded in a membrane separation device such as a microfiltration device, an ultrafiltration device, or a reverse osmosis membrane separation device, there is a spiral membrane module in which a separation membrane is wound around the outer periphery of a water collecting pipe.
[0003]
FIG. 2 is a partially exploded perspective view showing an example of the structure of the spiral membrane module.
[0004]
A plurality of bag-like separation membranes 2 on the outer periphery of the water collecting pipe 1 are wound through a mesh spacer 3.
[0005]
The water collecting pipe 1 is provided with a slit-like opening that communicates the inside and outside of the pipe. The separation membrane 2 has a bag shape, and the central portion surrounds the water collecting pipe 1. A channel material 4 made of mesh spacers or the like is inserted into the bag-shaped separation membrane 2, and the inside of the bag-shaped separation membrane (bag-shaped membrane) 2 is a permeate channel.
[0006]
A top ring 6 and an end ring 7 are provided at both ends of the wound body 5 of the bag-like film 2, and a brine seal 8 is provided around the outer periphery thereof.
[0007]
The raw water flows into the raw water flow path between the bag-like membranes 2 from the front end face of the wound body 5, flows as it is in the longitudinal direction of the wound body 5, and flows out as concentrated water from the rear end face of the wound body 5. . While flowing through this raw water flow path, water permeates the bag-like membrane 2 and enters the inside thereof, flows into the water collecting pipe 1 and is taken out of the module from the rear end side of the water collecting pipe 1.
[0008]
Conventionally, when contaminants such as slime and scale adhere to the membrane surface of such a spiral membrane module, and the membrane separation performance deteriorates, the spiral membrane module remains in the membrane module while being loaded in the membrane separator. the irrigant solution is circulated by washing, thereby achieving recovery of membrane performance.
[0009]
[Problems to be solved by the invention]
However, the conventional membrane module cleaning method in which the membrane module is washed while being loaded in the membrane separation apparatus has a drawback that a good cleaning effect cannot be obtained and the membrane performance cannot be sufficiently recovered. Also, many cleaning agents fluid volume needed, on the washing costly, is disadvantageous in terms of cleaning waste water treatment.
[0010]
The present invention solves the above conventional problems, provides a method for cleaning a spiral membrane module capable of effectively recover efficiently cleaned and membrane performance with less irrigant fluid volume spiral membrane module For the purpose.
[0011]
[Means for Solving the Problems]
The method of cleaning spiral membrane module of the present invention, after the vertically accommodate spiral wound membrane module for cleaning upwardly in the container, as one of at least a quarter of the membrane module is immersed, the irrigant fluid the implanting the bottom of the vessel and then the step of infiltrating the cleaning agent solution by introducing pressurized air from the bottom of the vessel to the film surface the whole area of the membrane module, the water and air thereafter for rinsing the bottom of the container And introducing the fluid mixture from the upper part of the membrane module.
[0012]
According to the cleaning method of the spiral membrane module according the present invention, after supplying a small amount of cleaning agent solution at the bottom of the container, by introducing a mixed fluid of air and water at the bottom of the container, the cleaning agent liquid it is possible to spread the entire membrane module can be cleaned the entire membrane module with a small amount of cleaning agent solution.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of a method for cleaning a spiral membrane module of the present invention will be described below in detail with reference to the drawings.
[0014]
FIG. 1 is a system diagram of a cleaning apparatus used in a method for cleaning a spiral membrane module according to an embodiment. The spiral membrane module 30 is accommodated in an upward cylindrical container 20 and the membrane module 30 is cleaned. I am doing so.
[0015]
The bottom portion of the cylindrical container 20 is closed with a bottom lid-shaped bottom seat 21. A fluid receiving chamber 22 made of a recess is provided at the center of the bottom seat 21, and inflow ports 23 and 24 are provided in the radial direction of the cylindrical container 20 so as to communicate with the fluid receiving chamber 22.
[0016]
The inlet 23, the cleaning agent liquid of the washing agent solution tank 10, the valve 11, while being capable introduced through the pipe 12, the pipe 13 having a valve 14, through the pipe 12 pressure 3 Compressed air of about ˜4 kg / cm 2 can be introduced.
[0017]
Rinsing water (such as pure water) can be introduced into the inflow port 24 via a pipe 25 with a valve 26.
[0018]
The bottom seat 21 is provided with a stepped portion 27, and the vicinity of the outer peripheral edge of the end face of the spiral membrane module 30 is seated on the stepped portion 27 via a ring-shaped rubber packing 28.
[0019]
A plurality of spokes 40 are installed on the upper portion of the container 20 in the radial direction. The spoke 40 is detachable from the container 20.
[0020]
A nut 41 is fixed to the centripetal end of the spoke 40. A screw rod 42 is screwed to the nut 41 so as to be capable of screwing up and down, and the membrane module 30 can be pressed downward by a pressing member 44 at the lower end of the rod 42. A handle 43 is attached to the top of the rod 42.
[0021]
A water receiving tray 50 having an outwardly expanding diameter is provided at the upper part of the container 20, and water overflowing the upper end of the container 20 flows into the tray 50 and is discharged from a drain outlet 51 to a drain pipe 52. It is possible to discharge through. In addition, even if the part from the connection part with the tray 50 of the container 20 to the connection part with the bottom seat 21 is a cylinder which has a continuous wall, a pipe or a rod may be arrange | positioned at intervals at the cylinder shape. Good. In the latter case, the upper part of the membrane module 30 may be sealed with rubber packing (not shown).
[0022]
Next, an example of a procedure for cleaning the membrane module 30 using this cleaning apparatus will be described.
[0023]
First, as shown in the figure, after the membrane module 30 is accommodated in the container 20, the spoke 40 is installed on the upper end of the container 20, and the rod 42 is turned to press the membrane module 30 from above.
[0024]
Then, opening the valve 11 to introduce the cleaning agent solution in the tank 10 into the container 20. Introduction amount of the cleaning agent solution is about 1/4 or more from the bottom side of the membrane module 30 (e.g., about 1 / 4-1 / 3) to the extent of immersion. Then, close the valve 11, opening the valve 14 in place, the compressed air is introduced into the container 20, bubbling irrigant solution. Thus, the cleaning agent liquid is a gas-liquid mixed phase liquid, standing riser to the top of the container 20, the whole of the membrane module 30 is in contact with the cleaning agent liquid of the gas-liquid mixed phase, the film surface is washed extensively, with The kimono is peeled off.
[0025]
Incidentally, when the cleaning agent liquid bubbling may be performed permeate side of the pressurization and depressurization of the membrane module via the water collecting pipe. Alternatively, water may be pressed into the permeate side to narrow the gap in the flow path on the raw water side, or the water may be drained and decompressed to increase the gap on the raw water side.
[0026]
An antifoaming agent may be added to the liquid overflowing into the tray 50 from the upper end of the container 20 to defoam. The tray 50 may be covered with vinyl or the like to prevent droplets from scattering.
[0027]
After a predetermined time (for example, 3 to 5 minutes) has elapsed, or after this bubbling is repeated a plurality of times as necessary, the valve 14 is closed, the valve 26 is opened, and water is introduced into the container 20. The amount of water introduced at this time is set to the extent that the rising velocity is the same as the water flow rate of the membrane module 30 in the actual apparatus. This water is introduced for about 1 to 5 minutes.
[0028]
Next, with the valve 26 open, the valve 14 is opened and the inside of the container 20 is bubbled. Thereby, the foreign material peeled off from the membrane module is swept away. The amount of air at the time of bubbling is such that the rising flow rate of the gas-liquid mixed phase flow is equal to or more than the amount of water flow in the actual apparatus, preferably 2 to 3 times. This bubbling is repeated a plurality of times as necessary. Then, the quality of water flowing out from the upper portion of the container 20 (for example, pH and dirt condition) is checked, and if the water quality is satisfactory, the cleaning is finished.
[0029]
Then, the valve 14 is opened to supply air, and the remaining water in the container 20 is discharged. Thereafter, the membrane module 30 is removed from the container 20.
[0030]
【Example】
Hereinafter, the present invention will be described more specifically with reference to examples.
[0031]
Example 1
In the apparatus of FIG. 1, as the cleaning agent liquid, surfactants 5% sodium hydroxide aqueous solution of pH12 containing 0.5% hydrazine was used.
[0032]
The inner diameter (diameter) of the bottom seat 21 is 21 cm, the container height is 142 cm, the outer diameter of the membrane module is 20 cm, and the length is 102 cm. This membrane module is an RO membrane module.
[0033]
As shown in FIG. 1, the membrane module was set in a cleaning device and then cleaned according to the following procedure.
(1) valve 11 is opened, and introducing the cleaning agent liquid 5L in the container 20.
(2) Open the valve 14, introduce 3 to 4 kg / cm 2 of air into the container 20, and bubble for about 3 minutes.
(3) Close the valve 14, open the valve 26 instead, and introduce 52 L of water in 2 minutes. The ascending flow rate is 26 L / min.
(4) With the valve 26 open, open the valve 14 for 5 minutes and bubble. The rising velocity of the gas-liquid mixed phase flow was 15 L / min.
(5) Check the water quality and finish cleaning. After the valve 26 is closed and the valve 14 is opened and the remaining water is discharged, the membrane module 30 is taken out.
[0034]
In the above-described process for about 20 minutes, the following cleaning effect could be obtained. That is, the inlet pressure of the membrane module, that was 21.5 kg / cm 2 was reduced to 9.1 kg / cm 2. Moreover, what was 19.6 kg / cm < 2 > exit pressure fell to 7.9 kg / cm < 2 >. Processing the amount of water, what was 0.81m 3 / Hr was recovered to 1.71m 3 / Hr.
[0035]
【The invention's effect】
As described above, according to the cleaning method of the spiral wound membrane module of the present invention, it is possible to effectively recover efficiently cleaned and membrane performance with less irrigant fluid volume spiral membrane module.
[0036]
According to the present invention, the contaminant at the time of membrane module cleaning can be discharged out of the system transient expression; save membrane module irrigant solution is possible (for example, saving water 100~150L.); Pressure The membrane module can be easily washed without being set in a container;
[Brief description of the drawings]
FIG. 1 is a system diagram of a cleaning apparatus used in a method for cleaning a spiral membrane module according to an embodiment of the present invention.
FIG. 2 is a partially exploded perspective view showing a structure of a general spiral membrane module.
[Explanation of symbols]
10 irrigant liquid tank 20 container 22 fluid receiving chamber 30 spiral membrane module 42 screw rod 43 the handle 44 pressing member 50 water receiving tray

Claims (2)

  1. After storing the spiral membrane module to be cleaned vertically in an upward facing container,
    As one of the at least a quarter of the membrane module is immersed, implanting irrigant fluid from the lower portion of the vessel,
    A step of infiltrating the cleaning agent solution by introducing pressurized air from the bottom of the vessel to the film surface the whole area of the membrane modules then
    And a step of introducing a mixed fluid of water and air for rinsing from the lower part of the container and discharging from the upper part of the membrane module.
  2. According to claim 1, comprising the steps of infiltrating the cleaning agent solution by introducing pressurized air from the lower portion of the container to the film surface the whole area of the membrane module, a mixed fluid of water and air for rinsing the bottom of the container A method for cleaning a spiral membrane module comprising the step of introducing only rinsing water from the lower part of a container between the step of introducing and discharging from the upper part of the membrane module.
JP2000076632A 2000-03-17 2000-03-17 Cleaning method for spiral membrane module Active JP4433553B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2000076632A JP4433553B2 (en) 2000-03-17 2000-03-17 Cleaning method for spiral membrane module

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2000076632A JP4433553B2 (en) 2000-03-17 2000-03-17 Cleaning method for spiral membrane module

Publications (2)

Publication Number Publication Date
JP2001259384A JP2001259384A (en) 2001-09-25
JP4433553B2 true JP4433553B2 (en) 2010-03-17

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Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NZ568167A (en) * 2005-12-09 2010-04-30 Siemens Water Tech Corp Reduced backwash volume process
JP4765874B2 (en) * 2006-09-28 2011-09-07 栗田工業株式会社 Membrane module cleaning method
JP4953806B2 (en) * 2006-12-28 2012-06-13 株式会社クラレ Filtration device
JP2011036752A (en) * 2009-08-07 2011-02-24 Panasonic Electric Works Co Ltd Reverse osmosis membrane module and water purification system incorporating the same therein
JP6140689B2 (en) * 2011-05-16 2017-05-31 アドヴァンスド ハイドロ インコーポレイテッドAdvanced Hydro Inc. Improved membrane with polydopamine coating
JP2016083641A (en) * 2014-10-29 2016-05-19 株式会社日立製作所 Reverse osmosis treatment device and method of washing reverse osmosis membrane
CN105692875B (en) * 2016-03-16 2018-05-18 东北农业大学 A kind of fouling membrane vibration control apparatus during rolling low pressure film process algae-containing water and the method using device control fouling membrane

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