KR20160015023A - Chemical- and water-saving CIP(cleaning-in-place) technique for membrane - Google Patents

Chemical- and water-saving CIP(cleaning-in-place) technique for membrane Download PDF

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Publication number
KR20160015023A
KR20160015023A KR1020140097385A KR20140097385A KR20160015023A KR 20160015023 A KR20160015023 A KR 20160015023A KR 1020140097385 A KR1020140097385 A KR 1020140097385A KR 20140097385 A KR20140097385 A KR 20140097385A KR 20160015023 A KR20160015023 A KR 20160015023A
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South Korea
Prior art keywords
separation membrane
cleaning
cleaning agent
agent
membrane
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KR1020140097385A
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Korean (ko)
Inventor
이태우
이정철
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주식회사 한화건설
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Priority to KR1020140097385A priority Critical patent/KR20160015023A/en
Publication of KR20160015023A publication Critical patent/KR20160015023A/en

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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
    • 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
    • B01D65/06—Membrane cleaning or sterilisation ; Membrane regeneration with special washing compositions
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a separation membrane used in an immersion or pressure separation membrane process, and more particularly, to a separation membrane cleaning method for cleaning a separation membrane with a small amount of a cleaning agent.

Description

[0002] Chemical-and water-saving CIP (cleaning-in-place)

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cleaning a separation membrane used in an immersion or pressure separation membrane process, and more particularly, to a separation membrane cleaning method for cleaning a separation membrane with a small amount of a cleaning agent.

As a result, various pollutants accumulate on the surface of the membrane, and as the filtration time is continued, various particles such as organic matters, polymers, and colloids, which are filtered by the separation membrane, are gradually concentrated on the surface of the separation membrane, And strong affinity to the surface of the separator are adsorbed on the surface of the separator, the performance of the separator is clogged by the chemical reaction and the performance of the separator is deteriorated. In severe cases, the deterioration of the separator itself occurs.

Therefore, filtration using a separation membrane necessarily requires a cleaning operation to restore the performance of the membrane, and physical cleaning and chemical cleaning are methods of cleaning the membrane. First, in the case of physical cleaning, it is a process of removing material adhering to a membrane by physical action of using water temperature and pressure, such as reverse cleaning, or rocking the membrane such as air cleaning, and the solidified contaminant can be removed However, a substance which is not removed even if physical cleaning is repeated over time is cleaned by using a chemical cleaning.

Fig. 1 is an embodiment for cleaning a conventional separation membrane. In the case of the conventional separation membrane cleaning method, the separation membrane is immersed for a long time and the cleaning is performed by using the oxidizing power of the chemical agent. More specifically, as shown in FIG. 1, in the conventional chemical cleaning, water is filled in the membrane filtration tank 11 provided with the separation membrane 12, and a certain amount of cleaning agent is supplied to the separation membrane 12 The separation membrane 12 is poured into the membrane filtration tank 11 so as to fill the inside of the membrane filtration tank 11 with a predetermined concentration of chemicals to cause a chemical reaction on the surface of the separation membrane 12 to be cleaned. That is, in the case of the conventional method for separating membrane for chemical formula separation, since a large amount of medicines or water is necessarily filled in the membrane filtration tank, the separating membrane 12 is completely immersed in the medicament or water and then washed. In addition, there is a problem that a process for treating a large amount of washing chemicals used for washing the separation membrane 12 is required.

Korean Patent Registration No. 10-1240258 ("Apparatus and Method for Restoring Water in the System in a Submerged Membrane Filtration System ", 2013.02.28.) For a method for cleaning a membrane using a conventional method.

Korean Patent No. 10-1240258, "Apparatus and method for recovering water in a system for immersion membrane filtration water purification system ", 2013.02.28.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a separation membrane cleaning method capable of easily cleaning a separation membrane using a small amount of a medicine.

The present invention is characterized in that a chamber 100 in which a separation membrane 200 is provided and in which a cleansing action of the separation membrane 200 occurs is provided with an acidic chemical tank 410 and an oxidant tank A cleaning agent supply pipe 300 connected to the fixing member 20 provided at the upper end of the separation membrane 200 and injecting the cleaning agent into each of the separation membranes 200; And a discharge pipe (500) communicating with the lower side of the chamber (100), the separation chamber cleaning method comprising: a chamber emptying step (S10) of emptying the chamber (100) (S20) of injecting the cleaning agent into the separation membrane (200) by the cleaning agent injection pipe (300) after step (S10); and injecting the cleaning agent into the separation membrane (S30) in which the separation membrane (200) is cleaned; And a discharging step S40 of discharging the cleaning agent used for cleaning the separation membrane 200 after the dormanting step S30. The cleaning agent applying step S20 and the dormant step S30 are repeatedly performed Conduct.

Meanwhile, the separation membrane cleaning method may include repeating steps (S20) and (S30) of applying the cleaning agent to one component of the acidic chemical agent or the oxidizing agent to complete the cleaning, The injecting step S20 and the dormant step S30 are repeatedly performed.

Meanwhile, in the step S20 of injecting the cleaning agent, 0.6 to 1.0 L of the cleaning agent is injected per m 2 of the separation membrane 200.

On the other hand, the cleaning agent may be one kind of acidic chemicals and / or oxidizing agents, or a mixture of plural kinds of acidic chemicals and / or oxidizing agents.

The separating membrane cleaning method of the present invention is a method in which the cleaning agent is directly supplied to the separation membrane in a state in which the separation membrane is exposed to the air while completely blanketing the chamber having the separation membrane to remove the waste matter generated on the separation membrane surface, The separation membrane can be more easily cleaned without being disturbed by the water pressure.

In addition, the separation membrane cleaning method of the present invention repeatedly performs a process of cleaning the separation membrane by supplying a predetermined cleaning agent according to the area of the separation membrane, thereby repeatedly cleaning the separation membrane with a clean cleaning agent to increase the cleaning efficiency, There is an advantage that the separation membrane can be easily cleaned by using a cleaning agent in an amount significantly smaller than the amount of the cleaning agent used in the method.

1 shows a conventional separation membrane cleaning apparatus
2 is a flowchart of the separation membrane cleaning method of the present invention
3 is a schematic view of a separation membrane cleaning method according to the present invention,
4 is a partial enlarged view of the separator of the present invention
5 is a schematic view after the implementation of the separation membrane cleaning method of the present invention
6 is a graph showing the results of experiments of the separation membrane cleaning method of the present invention

Hereinafter, the technical idea of the present invention will be described more specifically with reference to the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are included to provide a further understanding of the technical concept of the present invention, are incorporated in and constitute a part of the specification, and are not intended to limit the scope of the present invention.

FIG. 2 is a flow chart of the separation membrane cleaning method of the present invention, FIG. 3 is a schematic view before the separation membrane cleaning method of the present invention is carried out, FIG. 4 is a partial enlarged view of the separation membrane of the present invention, Fig.

As shown in FIG. 3, the separation membrane cleaning method of the present invention can be applied to all the purification apparatuses provided with the separation membrane 200 to perform the filtration action. Among them, the separation membrane 200 is provided, 200 are connected to the acidic chemical tank 410 and the oxidant tank 420 formed on the outer side of the chamber 100 and the other side is fixed to the upper end of the separation membrane 200, A separator cleaning apparatus 300 including a cleaning agent supply pipe 300 connected to the member 20 to inject cleaning chemicals into the separation membrane 200 and a discharge pipe 500 communicated with the lower side of the chamber 100, The separation membrane is cleaned.

The cleaning agent tank 400 is composed of an acidic chemical tank 410 and an oxidant tank 420. The respective tanks are connected to the cleaning agent inlet pipe 300 by respective pipes, And a pump 320 is provided on the cleaning agent supply pipe 300 to supply the cleaning agent smoothly and smoothly to the user. .

In the case where the acidic chemical tank 410 and the oxidant tank 420 are each loaded with one kind of medicament, when a plurality of medicines are mixed and used for cleaning the separation membrane 200, a plurality of medicines Or a plurality of tanks may be provided depending on the type of medicament and the respective tanks may be connected to the cleaning agent supply pipe 300 through respective pipes to selectively supply the medicines.

The separation membrane 200 has a plurality of through holes 10 formed in the separation membrane 200 in the form of a separation membrane that is generally used for purified water, A plurality of holes are formed in the fixing member 20 having a hollow interior at the upper end thereof, and each of the separation membranes is coupled to the holes, and the cleaning agent is injected into the separation membrane through the holes. Also, the lower end of the separation membrane 200 is joined by the fixing member 20. The fixing member 20 uniformly distributes and injects cleansing chemicals injected through the cleansing drug inlet pipe 300 into the respective separation membranes 200.

In the separation membrane cleaning method of the present invention, first, the chamber emptying step (S10) for emptying the chamber 100 is performed first. As shown in FIG. 3, the chamber evacuation step S10 discharges all the water and the like, which are introduced into the chamber 100, so that the entire separation membrane 200 is exposed to the atmosphere. In the separation membrane cleaning method of the present invention, the separation membrane is cleaned using the principle of back wash to discharge the cleaning agent from the inside to the outside of the separation membrane through the through hole 10, The cleaning agent is discharged from the inside to the outside and cleaned. Therefore, as described above, the separation membrane cleaning method of the present invention performs cleaning of the separation membrane 200 in a state where water or medicine is not used, unlike the cleaning method. Therefore, when separation occurs on the surface of the separation membrane 200, There is no material to pressurize the surface of the separation membrane 200, so that organic matter, waste materials and the like can be easily separated from the surface of the separation membrane 200, thereby improving cleaning efficiency.

Thereafter, the step of injecting cleaning chemicals (S20) is performed. The cleaning agent dosing step S20 includes an acidic chemical adding step and an oxidizing agent adding step and opens the valve of the pipe connected to one of the acid chemical tank 410 or the oxidizing agent tank 420, So that the acidic chemical agent or the oxidizing agent is injected onto the separation membrane 200 through the cleaning agent injection pipe 300.

Alternatively, when it is necessary to inject a plurality of kinds of medicines simultaneously according to the property of the separation membrane 200, a mixing transfer valve 310 is provided on the cleaning agent injection pipe 300, and the transfer valve 310 is closed And the valves formed in the acidic chemical tank 410 and / or the oxidant tank 420 on which the chemicals to be mixed are loaded are all opened and the piping between the mixed transfer valve 310 and the cleaning agent tank 400 And the transfer valve 310 may be opened to inject the drug into the separation membrane 200. [

As shown in FIG. 4, the cleaning agent injected through the cleaning agent inlet pipe 300 is injected into each of the separation membranes 200, and the cleaning agent injected through the through holes 10 is injected to the outside . The waste collected in the separation membrane 200 is peeled off by the pressure of the cleaning agent discharged through the through hole 10 and the cleaning agent discharged to the outside flows down along the separation membrane 200, And cleaning is carried out.

Therefore, in the separation membrane cleaning method of the present invention, the separation membrane 200 needs to be cleaned by repeatedly applying a certain amount of cleaning agent enough to wet the entire separation membrane 200. In this case, The amount of the chemical to be injected into the separation membrane 200 at one time is the highest in the cleaning efficiency when 0.6 L to 1.0 L is injected per unit area (m 2). Therefore, The amount of the drug to be injected may vary depending on the concentration of the drug or the degree of contamination of the separation membrane 200. Therefore, it is preferable to calculate the optimum amount considering the various parameters so that the washing efficiency of the separation membrane 200 is highest and the amount of economical efficiency is input.

Next, a resting step S30 is performed. In the dormant step S30, the cleaning agent discharged through the through hole 10 is firstly peeled off from the surface of the separation membrane 200 by pressure, and then peeled off by pressure and chemical reaction are performed , Various wastes are peeled off from the surface of the separation membrane 200, and the separation membrane 200 is cleaned by decomposition of organic matter and the like. At this time, the longer the dwell step (S30), the longer the cleaning time and the better the cleaning efficiency. However, in the separation membrane cleaning method of the present invention, a small amount of cleaning agent is injected into the separation membrane (200) The chemical reaction on the surface of the separation membrane 200 can not be easily performed because the surface of the separation membrane 200 is dry. Therefore, the dormant step S30 is performed for a time period of about 7 minutes to 15 minutes, so that the separation membrane 200 is not dried and the cleaning action can be easily performed. However, have.

Next, the discharge step S40 is performed. 4, when the separation membrane 200 is cleaned by the above-described process, the cleaning agent and waste materials used for cleaning the separation membrane 200 are discharged to the chamber 100, At this time, the discharge valve 510 is opened to discharge the cleaning agent to the outside of the chamber 100 through the discharge pipe 500 to complete the cleaning of the separation membrane 200. At this time, the discharged cleaning chemicals may be collected in a certain tank, or may be supplied to the cleaning chemical tank 400 after being treated by using a certain treatment facility so that the discharged cleaning chemicals can be reused.

Meanwhile, the separation membrane cleaning method of the present invention is repeatedly carried out in the step of injecting the cleaning agent (S20) and the dormant step (S30) until the separation of the waste material and the decomposition of the organic material are no longer carried out, The number of repetitions of the cleaning agent injecting step (S20) and the dormant step (S30) is set to an optimal condition according to the experiment.

Further, in the separation membrane cleaning method of the present invention, the steps of injecting the cleaning agent (S20) and the dormant step (S30) are repeatedly performed on one chemical agent so that the waste matter and organic matter are no longer decomposed, And the above process is repeated by injecting the medicine. That is, in the case where the separation membrane is cleaned by injecting the acidic chemical first, the process of repeating the process of repeatedly injecting the acidic chemical and stopping it is completely completed, and then the process of feeding the oxidizer and stopping the operation is repeated Thereby cleaning the separation membrane.

Meanwhile, in the separation membrane cleaning method of the present invention, when the separation membrane 200 is exposed to the oxidizer for a long time, the separation membrane 200 may be damaged. Therefore, the total amount of the introduction and downtime using the oxidizer should not exceed 6 hours.

6 (a) is a table showing experimental conditions and results, and FIG. 6 (b) is a graph showing the results of experiments on the experimental condition at 25 degrees Celsius FIG. 3 is a graph showing the trans-membrane pressure (TMP) of the separated membrane according to the passage of time.

6 (a), the experiment is performed by limiting the cleaning agent used for washing the separation membrane to sulfuric acid, citric acid, and sodium chloride. However, the present invention is not limited to the type, material, It may be selected from a variety of acidic chemicals or oxidants which are conventionally used for cleaning the separator, depending on various variables, and is not limited to the cleaning agent used in the present experiment .

In this experiment, the separation membrane was cleaned by injecting chemicals having a concentration similar to that of the chemical used in the separation membrane using the conventional immersion method. As shown in FIG. 6 (a), only acidic chemicals having a concentration of 1000 ppm were injected in case 1, 1000 ppm of acidic chemicals and oxidant were added in case 2, and in case 3, acidic chemicals and oxidant And the separation membrane was cleaned. At this time, in this experiment, an amount corresponding to about 1/6 to 1/3 of the amount of the drug used in the conventional immersion method was injected to wash the membrane.

As shown in FIG. 6 (b), when comparing the initial TMP of the separation membrane after cleaning with the rising speed of TMP with time, when the conventional immersion method was used and the experiment was conducted according to the separation membrane cleaning method of the present invention It can be seen that all of them show a similar increase. Therefore, the separation membrane cleaning method of the present invention can achieve a similar cleaning effect in comparison with the conventional immersion method, even if only a small amount of acid chemical agent is injected. In the case of cleaning the separation membrane using an acidic agent and an oxidizing agent, It is possible to obtain a cleaning effect higher than that of the cleaning solution. Also, when the same acidic chemicals and oxidizing agents are used simultaneously, it can be seen that a higher cleaning effect is obtained when a higher concentration of the chemicals is used.

Meanwhile, in the present invention, the acidic chemical and the oxidant are injected for 30 seconds and the process of stopping for 7 minutes is repeated 6 times to exhibit a cleaning effect similar to the conventional immersion method and the separation membrane is cleaned. However, The amount of the cleaning agent, the concentration, the resting time, the number of repetitions, and the like can be appropriately determined and used according to the use conditions and the degree of contamination of the cleaning agent 200.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

10: Through the hole
11: membrane filtration tank 12: membrane
20: Fixing member
100: chamber 200: separator
300: Cleaning agent injection pipe
310: Mixed feed valve 320: Pump
410: acidic chemical tank 420: oxidant tank
400: cleaning chemical tank
500: discharge pipe 510: discharge valve
S10 to S40: Sequence of separation membrane cleaning method of the present invention

Claims (4)

And an acidic chemical tank 410 and an oxidant tank 420 formed on the outer side of the chamber 100 and having one side connected to the separator 200, A cleaning agent supply pipe 300 connected to the fixing member 20 provided at the upper end of the separation membrane 200 and injecting the cleaning agent into each of the separation membranes 200; And a discharge pipe (500) formed in communication with the lower side of the chamber (100), the separation membrane cleaning method comprising:
A chamber emptying step (S10) of emptying the interior of the chamber (100);
(S20) of injecting a cleaning agent into the separation membrane (200) by the cleaning agent introduction pipe (300) after the chamber evacuation step (S10);
A resting step (S30) in which the injected cleaning agent causes a chemical reaction on the separation membrane (200) and the separation membrane (200) is cleaned; And
A discharging step S40 of discharging the cleaning agent used for cleaning the separation membrane 200 after the dormant step S30;
(S20) and a dormant step (S30) repeatedly.
The method according to claim 1,
In the separation membrane cleaning method,
(S20) and a resting step (S30) are repeatedly performed on one component of the cleaning agent, the acidic agent or the oxidizing agent, (S30) repeatedly.
The method according to claim 1,
The cleaning agent injecting step (S20)
Wherein the cleaning agent is injected at a rate of 0.6 to 1.0 L per m 2 of the separation membrane (200).
The method according to claim 1,
The cleaning agent,
A separation membrane cleaning method comprising using one kind of acidic chemical and / or oxidizing agent, or using a mixture of plural kinds of acidic chemical and / or oxidizing agent.
KR1020140097385A 2014-07-30 2014-07-30 Chemical- and water-saving CIP(cleaning-in-place) technique for membrane KR20160015023A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101240258B1 (en) 2012-04-26 2013-03-07 주식회사 한화건설 Methods and apparatus of chemical water recycling during in-situ clean in place for submerged membrane system in drinking water treatment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101240258B1 (en) 2012-04-26 2013-03-07 주식회사 한화건설 Methods and apparatus of chemical water recycling during in-situ clean in place for submerged membrane system in drinking water treatment

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