JP2009241042A - Method and apparatus for refreshing membrane for preparing ballast water - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for refreshing membrane for preparing ballast water capable of decreasing a quantity of consuming hydrogen peroxide by immersing the membrane in a low-concentrated hydrogen peroxide aqueous solution for a long time during a cruising period, and a method and an apparatus for refreshing membrane for preparing ballast water capable of decreasing a quantity of consuming hydrogen peroxide by setting a chemical concentration depending on a cruising period. <P>SOLUTION: The method of preparing ship ballast water by subjecting sea water to membrane filtration with a filtrating membrane 113 to separate and generate the ship ballast water includes keeping the filtrating membrane 113 immersed in a low-concentrated hydrogen peroxide aqueous solution having a concentration ranging from 0.2 to 0.5% when washing for 24 hours. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for regenerating a membrane for producing ballast water, and more specifically, a hydrogen peroxide solution concentration can be defined according to the number of days of navigation of a ship, and immersion treatment is performed using a low concentration hydrogen peroxide solution. The present invention relates to a method and an apparatus for regenerating a membrane for producing ballast water that can reduce the amount of hydrogen peroxide used.

  A cargo ship that transports crude oil or the like is provided with a ballast tank in order to maintain the stability of the hull during navigation. Usually, when crude oil or the like is not loaded, the inside of the ballast tank is filled with ballast water, and when the crude oil or the like is loaded, the ballast water is discharged to adjust the buoyancy of the hull and stabilize the hull. As described above, the ballast water is water necessary for the safe navigation of the ship, and the seawater of the port that performs cargo handling is usually used. The amount is said to exceed 10 billion tons per year worldwide.

  By the way, the ballast water contains microorganisms and eggs of small and large organisms that inhabit the port where the water was taken. It will be. Therefore, the destruction of ecosystems, such as the replacement of existing species with species that did not originally live in the sea, has become serious.

  Against this backdrop, the diplomatic meeting of the International Maritime Organization (IMO) adopted the obligation to take periodic inspections related to ballast water treatment equipment, etc., and is applied to construction ships from 2009 onwards.

In addition, the emission standard (G8) stipulated in the D-2 regulation of the Convention for the Regulation and Management of Ship Ballast Water and Sediment (hereinafter referred to as the Convention) is 10 / ml for plankton with a size of 10-50 μm. 10 / m ³ for plankton with a size of 50 μm or more; 250 cfu / 100 ml for Escherichia coli with a size of 0.5-3 μm; 1 cfu / 100 ml for Vibrio cholerae with a size of 0.5-3 μm; 0.5-3 μm Enterococci of 100 cfu / 100 ml.

  In addition, the Ballast Water Management System Approval Procedure (G9), which uses active substances adopted on July 22, 2005, describes the purpose of the active substances and one or more in relation to ship safety, human health and water environment. The applicability of a formulation containing any active substance and its application in a ballast water management system shall be determined. And in this G9, active substances are defined as substances or organisms containing viruses or fungi that have general or specific action against harmful aquatic organisms and pathogens, and we are going to require toxicity tests as verification .

  From the above background, very strict sterilization or sterilization is required to satisfy the requirements of G8 and G9.

  Conventionally, as a technique for sterilizing and sterilizing ballast water, a technique described in Patent Document 1 is known as a chemical technique using ozone.

  Patent Document 1 proposes a technique for injecting ozone into ballast water in combination with steam injection, and further sterilizing ozone while reducing the amount of ozone used by promoting the generation of hydroxy radicals by microbubbles. .

  However, there is a limit to the reduction in the amount of ozone used, and research for adopting film treatment is rapidly progressing (Patent Document 2).

  Seawater contains many organism-derived gel-like substances and substances that easily clog membranes, so long-term operation can be achieved when membrane treatment is performed with ballast water using membrane modules. In addition, membrane cleaning is important.

Patent Document 3 discloses a technique using an enzyme in membrane cleaning, and Patent Document 4 discloses a combined technique of an enzyme and an oxidizing agent. Patent Document 5 discloses a technique using ethylenediaminetetraacetic acid tetrasodium tetrahydrate in membrane cleaning.
JP 2004-160437 A JP 2003-154360 A JP 2007-160242 A Japanese Patent Laid-Open No. 3-133947 JP 11-319518 A

  The above G9 requirement is severe, and even when the membrane is backwashed, if the wastewater is dumped into the sea, certain standards must be met, and sterilization is required for that purpose.

  The inventors of the present invention attempted to clean the membrane using a chemical solution, and first examined the selection of the chemical solution. As the chemical solution, sodium hypochlorite can generally be used, but its persistence, the membrane In view of the ease of separation and decomposition of deposits and organic matter, handling and safety, it was found that hydrogen peroxide solution was superior.

  The higher the concentration of the hydrogen peroxide solution, the better the cleaning effect of the membrane to be cleaned and the permeation performance of the membrane recovers faster, but if the concentration is high, it will not be used for cleaning and will naturally decompose. Since the amount of hydrogen oxide also increases, the amount of hydrogen peroxide used is increased correspondingly, resulting in a high cost.

  Therefore, as a result of intensive studies on the method of reducing the amount of hydrogen peroxide used, the present inventors have focused on the fact that a ship loaded with ballast water does not require the operation of a membrane treatment facility during the navigation period. It was found that the membrane could be cleaned over time during the voyage.

  In addition, since the voyage is various from short distance to long distance, paying attention to the difference in the time available for chemical cleaning, it was found that the amount of drug used can be reduced if the chemical concentration can be set according to the navigation period.

  Accordingly, an object of the present invention is to provide a method and an apparatus for regenerating a film for producing ballast water that can reduce the amount of hydrogen peroxide used by dipping treatment with a low concentration of hydrogen peroxide solution over time during the navigation period. There is.

  Another object of the present invention is to provide a method and an apparatus for regenerating a membrane for ballast water production that sets the concentration of a chemical solution according to a navigation period and reduces the amount of the drug used.

  Furthermore, the other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

(Claim 1)
In the ship ballast water production method of separating and producing ship ballast water by membrane filtering seawater through a filter membrane,
When the filtration membrane is washed, the filtration membrane is immersed in a low-concentration hydrogen peroxide solution in the range of 0.2 to 0.5% for 24 hours or more, and regeneration of the membrane for producing ballast water Method.

(Claim 2)
The method for regenerating a membrane for producing ballast water according to claim 1, wherein the concentration of the hydrogen peroxide solution is set in the range of 0.2 to 0.5% according to the number of days of navigation of the ship.

(Claim 3)
The method for regenerating a membrane for ballast water production according to claim 1 or 2, wherein the immersion treatment is performed in a membrane filtration apparatus or in a separately provided immersion tank while the ship is sailing.

(Claim 4)
4. The method for regenerating a membrane for producing ballast water according to claim 1, wherein the low-concentration hydrogen peroxide solution in the range of 0.2 to 0.5% is produced during navigation of the ship.

(Claim 5)
A filtration membrane device for ship ballast water having a raw water chamber for introducing seawater, a filtration membrane for membrane filtration, and a treatment chamber for storing ship ballast treatment water filtered and separated by the filtration membrane; Consisting of equipment,
The filtration membrane regenerating liquid production apparatus includes a regenerating liquid tank containing hydrogen peroxide water in a range of 0.2 to 0.5%,
Regeneration of a film for producing ballast water, characterized by comprising means for setting a hydrogen peroxide tank concentration according to the number of days of navigation of the ship, and means for creating hydrogen peroxide water having the set concentration apparatus.

(Claim 6)
The filtration membrane device partitions a tank into a raw water chamber and a treated water chamber by a partition plate, and covers the outer periphery of the porous cylindrical support body having an opening on the processing chamber side in the raw water chamber. A large number of filter cylinders are formed, and seawater that has entered the raw water chamber flows upward in the raw water chamber, and is filtered by the membrane and rises in the filter cylinder as treated water. 6. The apparatus for regenerating a membrane for producing ballast water according to claim 5, wherein the apparatus has a structure for collecting water indoors.

  ADVANTAGE OF THE INVENTION According to this invention, the reproduction | regeneration method and apparatus of the film | membrane for ballast water manufacture which can reduce the usage-amount of hydrogen peroxide can be provided by carrying out immersion treatment during a navigation period with the low concentration hydrogen peroxide solution over time. .

  In addition, according to the present invention, it is possible to provide a method and an apparatus for regenerating a membrane for producing ballast water, in which the concentration of a chemical solution is set in accordance with a navigation period to reduce the amount of medicine used.

  The method for regenerating a membrane for producing ballast water according to the present invention is applied to a method for producing ship ballast water in which seawater is subjected to membrane filtration through a filtration membrane to separate and produce ship ballast water.

  In the present invention, the ballast water is transferred to the ballast tank by subjecting seawater to membrane treatment, and plays a role of ensuring a balance in navigation of the ship. When seawater is membrane-filtered, zooplankton, phytoplankton, microorganisms, elements such as Si, Al, and Fe in the seawater, inorganic substances such as oxides and chlorides, other suspended substances (SS), gel-like substances Etc. are separated and removed.

  Ballast filtration membranes filter the seawater from the membrane, transfer it to a ballast tank, fill it, and then wash it with chemicals, specifically with hydrogen peroxide during the navigation of the ship, to remove gel-like substances attached to the membrane. Remove and play.

  A feature of the present invention is that when the filtration membrane is washed, the filtration membrane is immersed in a low concentration hydrogen peroxide solution in the range of 0.2 to 0.5% for 48 hours or more.

  The voyage of a ship is various from a short distance to a long distance.

  For example, at short distances such as between Busan Port and Hakata Port, the navigation time is less than one day, and at long distances, the navigation period is as long as one month. Therefore, when the navigation period is long, there is no problem even if the immersion time is increased.

  As can be seen from the experimental results described later, even if the hydrogen peroxide solution concentration is as low as 0.2%, if the immersion treatment is performed for 24 hours or more, the permeability of the membrane is restored to that of a new product.

[Experimental example]
A backwash cartridge filter (BW-40BN-IS, manufactured by Yuasa Membrane System Co., Ltd.) of a ship ballast water treatment apparatus that has been subjected to ballast water filtration and has reduced water permeability was disassembled, and a membrane element was taken out.

  This membrane element was punched into a diameter of 47 mm to prepare a test sample.

  Using hydrogen peroxide water adjusted to 0.2%, 0.5%, and 1.0% as a cleaning solution, the samples were immersed at 25 ° C. for 4 hours, 24 hours, 48 hours, and 72 hours, respectively.

Diluted water and filtered seawater were used for dilution of the hydrogen peroxide solution, and the chemical solution was used at ² L / m ^{2 with} respect to the membrane area.

  The results are shown in Table 1 and FIG.

The evaluation of water permeation performance is the time (sec / 100 ml · 13.8 cm ² at 50) required for 100 ml of water to permeate through a membrane having an area of 13.8 cm ² under a pressure of 50.7 kPa (gauge pressure). .7 kPa).

The water permeation performance of the sample before chemical cleaning was 245.4 sec / 100 ml · 13.8 cm ² at 50.7 kPa, but when diluted with distilled water, it was 0.2% for 48 hours, 0.5% and 1. At 0%, it was less than 20 sec / 100 ml · 13.8 cm ² at 50.7 kPa after 24 hours. Even when filtered seawater was used, it was less than 20 sec / 100 ml · 13.8 cm ² at 50.7 kPa after 24 hours at 0.2% and 0.5% and 24 hours at 1.0%.

Since the permeability of the new membrane is 10 to 20 sec / 100 ml · 13.8 cm ² at 50.7 kPa, it is found that a sufficient membrane regeneration effect can be obtained by immersion treatment for 24 hours or more, preferably 48 hours or more. It was.

  In the present invention, if a dipping time of 24 hours or longer, preferably 48 hours or longer is provided, a sufficient film regeneration effect can be obtained even at 0.2% to 0.5%. Therefore, 24 hours, preferably 48 hours or longer. When immersion time can be provided, the hydrogen peroxide concentration is 0.2% to 0.5%, and more preferably 0.2 to 0.3%. If the hydrogen peroxide concentration is lower than 0.2%, the hydrogen peroxide is consumed while the cleaning is insufficient, so that even if immersed for a long time, the cleaning effect cannot be obtained. The upper limit of the immersion time is 72 hours. Even if immersed more than this, the cleaning effect does not increase.

  The filtration membrane to be cleaned may be a microfiltration membrane or an ultrafiltration membrane, but a microfiltration membrane having an opening of 0.4 to 0.9 μm is preferable in producing ballast water.

  In the case of the microfiltration membrane, the form of the membrane may be any, and there are a spiral, a flat membrane, a cylindrical membrane, etc. Among them, the cylindrical membrane described later is preferable.

  The low-concentration hydrogen peroxide solution in the range of 0.2 to 0.5% departs from a ship with a high-concentration hydrogen peroxide solution in advance and is manufactured while the ship is sailing. Diluted hydrogen peroxide water includes filtered seawater, clean water, fresh water or distilled water, but clean water other than seawater, fresh water or distilled water is preferred because of its high cleaning effect.

  Water other than sea water, fresh water or distilled water means fresh water, fresh water or distilled water that does not contain sea water. Water is fresh water that can be used as drinking water, typically tap water or well water. is there. Fresh water is generally river water or lake water that does not contain seawater, and water that can be drunk by flocculation or sterilization is used. Distilled water is fresh water from which salts have been removed, and can be used when it can be easily obtained on land. Above all, clean water is more preferable because of its availability. These water supplies are loaded on the ship at the time of departure.

  Moreover, since these clean water etc. cannot be obtained at sea, it is preferable to collect the hydrogen peroxide solution used for washing | cleaning, without throwing it away, and to add and recycle the insufficient hydrogen peroxide solution.

  Next, a membrane regenerating apparatus for producing ballast water according to the present invention will be described with reference to the drawings.

  FIG. 2 is a schematic view showing an example of a membrane regenerating apparatus for producing ballast water.

  The membrane regenerating apparatus for producing ballast water in FIG. 2 comprises a filtration membrane apparatus and a filtration membrane regenerating liquid producing apparatus capable of recovering and reusing hydrogen peroxide water used for washing. Reference numeral 1 denotes a filtration membrane device, and 2 denotes a filtration membrane regenerating liquid production device.

  The filtration membrane device 1 includes a filtration tank 100, and the filtration tank 100 is preferably formed in a cylindrical bowl shape.

  The filtration tank 100 is partitioned by a partition plate 101 into a raw water chamber 102 into which seawater is introduced and a treated water chamber 103 into which treated water after being filtered is collected.

  A supply port 104 is provided at the side of the raw water chamber 102, and a treated water discharge port 105 is provided at the upper portion of the treated water chamber 103.

  A seawater supply pipe 106 is connected to the supply port 104. 106 A is an on-off valve provided in the seawater supply pipe 106.

  A treated water discharge pipe 107 is connected to the treated water discharge port 105, and the treated water discharge pipe 107 is provided with an on-off valve 107A.

  The treated water discharge port 105 is connected to a hydrogen peroxide solution supply pipe 108 for cleaning the hydrogen peroxide solution of the filtration membrane, and the hydrogen peroxide solution supply pipe 108 is provided with an on-off valve 108A. Yes.

  A washing drain discharge port 109 is provided at the bottom of the raw water chamber 102. A cleaning drainage discharge pipe 110 is connected to the cleaning drainage discharge port 109, and the cleaning drainage discharge pipe 110 is provided with an on-off valve 110A.

  111 is a filter cylinder suspended, for example, on the partition plate 101. The filter cylinder 111 is composed of a porous cylindrical support 112 and a filter membrane 113 formed in a bag shape on the outer periphery of the support 112. The upper part of the filtration cylinder 111 has an upper opening 114 that opens toward the treated water chamber 103 so that the treated water can be sent to the treated water chamber 103.

  The support body 112 has a resin cylindrical shape having an upper opening 114. For example, a support made of polyethylene can be used.

  The surface of the support 112 may be formed in a mesh shape or may be formed in a porous shape. The opening ratio on the surface of the support 112 is preferably in the range of 40% to 70%, more preferably in the range of 45% to 65%, and still more preferably in the range of 50% to 65%.

  A microfiltration membrane, an ultrafiltration membrane, or the like can be used as the filtration membrane 113, but a microfiltration membrane is preferable. The microfiltration membrane that can be preferably used in the present invention can be obtained as a commercial product, for example, “Yumicron membrane filter” manufactured by Yuasa Membrane System Co., Ltd. can be used.

  In this aspect, a plurality of filter tubes 111, 111,... Are arranged in a suspended shape in the raw water chamber 102, but the number is not necessarily limited.

  In such a membrane filtration device, during the treatment of seawater, seawater is introduced into the raw water chamber 102 from the supply pipe 106 via the supply port 104, flows upward in the raw water chamber 102, and passes through the filtration membrane 113. Filtered. The treated water filtered by the filtration membrane 113 proceeds further upward in the filter cylinder 111, is collected in the treated water chamber 103, and is discharged from the discharge port 105 through the discharge pipe 107.

  If the raw water treatment with the filtration membrane 113 is continued in this manner, the filtration membrane 113 is gradually clogged, and thus the filtration membrane 113 needs to be washed with hydrogen peroxide.

  As the hydrogen peroxide solution for membrane cleaning, the hydrogen peroxide solution manufactured by the filtration membrane regenerating liquid manufacturing apparatus 2 is used.

The filtration membrane regenerating liquid production apparatus 2 includes a regenerating liquid tank 200, and reduces the amount of hydrogen peroxide to be supplied to the filtration membrane apparatus 1 (for example, 3 m ³ ) and hydrogen peroxide in order to discard the regenerating liquid. Considering the amount of sodium sulfite added (for example, 0.5 m ³ ) as a reducing agent for reducing the hydrogen oxide concentration to zero, it is designed to be, for example, 3.5 m ³ .

  When there are one or more filtration membrane devices 1, it is preferable to wash one by one in order. In order to be able to wash a plurality of filtration membrane devices at the same time, the capacity of the regenerating liquid tank can be increased as required.

  The material of the tank 200 is not particularly limited as long as it has corrosion resistance. For example, polyethylene resin, vinyl chloride resin, rubber lining, etc. are used.

  The tank 200 is provided with a stirrer 201 and a hydrogen peroxide concentration measuring device 202 for measuring the hydrogen peroxide concentration.

  The aspect in which the hydrogen peroxide concentration measuring apparatus 202 can measure the hydrogen peroxide concentration in seawater is preferable. For example, a “hydrogen peroxide concentration meter” manufactured by Hokuto Denko Co., Ltd. can be used. As the membrane regenerating solution, clean water or the like is used as a dilute solution of hydrogen peroxide solution, but seawater in the filtration tank 100 of the filtration membrane device is contaminated while circulating between the filtration membrane device 1 and the tank 200. Gradually, the seawater concentration increases in the water. Therefore, a hydrogen peroxide concentration measuring device that can measure the concentration even in the presence of seawater is required.

  A water supply pipe 203 is connected to the tank 200 and is added to dilute the hydrogen peroxide solution to obtain a hydrogen peroxide solution having a predetermined concentration.

  204 is a hydrogen peroxide tank, 205 is a stirrer, and 206 is a water supply pipe. In the hydrogen peroxide solution tank 204, the hydrogen peroxide concentration is adjusted to a predetermined value by the clean water. Reference numeral 207 denotes a hydrogen peroxide solution pump, which supplies hydrogen peroxide solution to the tank 200. The concentration of the hydrogen peroxide solution at this time is preferably in the range of 0.2 to 0.5%.

In tank 200, to produce a 0.5% aqueous hydrogen peroxide 3m ³ mixes the clean water 2.96M ³ and 35% aqueous hydrogen peroxide 0.04 m ^3.

  208 is a sodium sulfite tank, 209 is a stirrer, 210 is a sodium sulfite pump, and 211 is a water supply pipe. This sodium sulfite is a reducing agent when the regenerated solution is discarded. If hydrogen peroxide remains in the regenerated solution, it is against G9 regulations and cannot be discarded as it is. In the present invention, hydrogen peroxide is reduced using sodium sulfite to confirm that the hydrogen peroxide concentration has become zero, and then discarded. The reducing agent is not limited to sodium sulfite and may be decomposed by a catalyst.

  The 0.5% hydrogen peroxide solution produced above is pumped by the pump 212 and sent to the treated water chamber 103 of the filtration tank 101 through the supply pipe 108. The filtration tank 101 is filled with hydrogen peroxide, and the filtration membrane is washed. The organic matter adhering to the filtration membrane is decomposed and removed by the cleaning, and returned to the tank 200 through the pipe 110 as a cleaning waste liquid. A filter 213 is installed in the pipe 110 to remove impurities in the cleaning waste liquid. If the filter 213 is clogged, it is washed or replaced as appropriate.

  In the present invention, the amount of consumed hydrogen peroxide solution is obtained from the value measured by the concentration meter 202 that measures the concentration of hydrogen peroxide solution in the regeneration solution in the regeneration solution tank 200. Then, hydrogen peroxide water corresponding to the consumed amount is supplied to the regenerated liquid tank 200.

  This regenerated solution is contaminated with seawater in the process of circulating between the tank 200 and the filtration tank 100, but the amount thereof is small, so that it hardly inhibits the dissolution of hydrogen peroxide in the diluted solution. Further, in the above circulation process, hydrogen peroxide is consumed, so the dilution water is replenished very little. Therefore, the membrane regenerating liquid can be produced by using a small amount of clean water or the like, and the membrane can be cleaned.

  Next, a preferred embodiment of the hydrogen peroxide concentration measuring apparatus 202 used in the filtration membrane regenerating liquid manufacturing apparatus will be described with reference to FIG.

  The regenerated liquid sample in the tank 200 is introduced from the sample inlet into the apparatus 202 by a pump (P4). Usually, in order to confirm that the concentration of hydrogen peroxide is a predetermined concentration, the regenerated solution sample is sent to the high concentration hydrogen peroxide concentration measuring tank 202A. The measurement tank 202A is provided with a polaro-type electrode. A flow meter 202B is provided in the middle of the piping to the measurement tank 202A, and the operation of the pump (P4) is controlled so that the flow rate becomes constant. Two electrodes of a comparison electrode and a measurement electrode are set in the measurement tank 202A. A potential difference is generated between the two electrodes in proportion to the hydrogen peroxide concentration.

  This potential difference is amplified by the transmitter 202C and further converted into a current value by the distributor 202D to obtain a measured value.

  The high concentration hydrogen peroxide concentration measuring tank 202A is used for producing a membrane cleaning regenerating solution.

  On the other hand, when discarding the regenerated solution, the low concentration hydrogen peroxide concentration measuring tank 202E is used. It is measured by the low concentration hydrogen peroxide concentration measuring tank 202E to check whether the hydrogen peroxide concentration has become zero.

  When using one measuring tank, do not use the other measuring tank.

  In this embodiment, it is preferable that the regenerated solution sample is continuously introduced into the analyzer and the concentration measurement value is continuously obtained.

  The measured value is sent to the controller 202F and used as various control signals. In the illustrated example, control of the hydrogen peroxide pump, control of the sulfite pump, and the like are performed.

  The standard solution is used for calibration. Calibration fluid is sent to the measuring tank only during calibration.

  FIG. 4 is a flowchart showing the operation procedure of the apparatus for regenerating a membrane for producing ballast water in the present invention in the apparatus of FIG.

  First, the immersion time is determined from the number of days of navigation (I).

  The immersion time can be obtained by changing the number of days of voyage to time when there is one filtration membrane device 1 that requires cleaning.

If there are two or more units that need cleaning,
Immersion time = days of voyage x 24 / (base number of filtration device / base number of filtration device that can be washed per wash)
Can be calculated with

  Next, the hydrogen peroxide concentration is determined by comparing the immersion time with a table such as FIG. 4 (II).

  A necessary amount of hydrogen peroxide solution is added to the regenerated liquid tank 200 from the hydrogen peroxide solution tank 204 to produce hydrogen peroxide solution having the determined concentration (III).

  The produced hydrogen peroxide solution is introduced into the filtration membrane device 1 and immersion treatment is performed (IV).

  After the determined soaking time has elapsed, the hydrogen peroxide solution is recovered (V).

  The concentration of the collected hydrogen peroxide solution is measured by the hydrogen peroxide concentration measuring device 202, and another filtration membrane device is washed again or discarded.

Comparison test result of cleaning effect by hydrogen peroxide solution Schematic showing an example of a membrane regenerator for ballast water production The figure which shows the preferable aspect of the hydrogen peroxide concentration measuring apparatus used for the manufacturing apparatus of filtration membrane reproduction | regeneration liquid. The flowchart which shows the operation | movement procedure of the reproduction | regeneration apparatus of the film | membrane for ballast water manufacture in this invention Example of a table for determining immersion time

Explanation of symbols

1: Filtration membrane apparatus 100: Filtration tank 101: Partition plate 102: Raw water chamber 103: Treated water chamber 104: Supply port 105: Treated water discharge port 106: Seawater supply pipe 106A: Open / close valve 107: Treated water discharge pipe 107A: Open / close Valve 108: Hydrogen peroxide water supply pipe 108A: On-off valve 109: Washing drain discharge port 110: Washing drain discharge pipe 110A: On-off valve 111: Filter cylinder 112: Support body 113: Filtration membrane 114: Upper opening 2: Filtration membrane regeneration Liquid manufacturing apparatus 200: Regeneration liquid tank 201: Stirrer 202: Hydrogen peroxide concentration measuring apparatus 202A: High concentration hydrogen peroxide concentration measuring tank 202B: Flow meter 202C: Transmitter 202D: Distributor 202E: Low concentration hydrogen peroxide concentration measuring tank 202F : Controller 203: Water supply pipe 204: Hydrogen peroxide tank 205: Stirrer 06: water supply pipe 207: hydrogen peroxide water pump 208: sodium sulfite tank 209: stirrer 210: sodium sulfite Pump 211: water supply pipe 212: Pump 213: Filter

Claims (6)

In the ship ballast water production method of separating and producing ship ballast water by membrane filtering seawater through a filter membrane,
When the filtration membrane is washed, the filtration membrane is immersed in a low-concentration hydrogen peroxide solution in the range of 0.2 to 0.5% for 24 hours or more, and regeneration of the membrane for producing ballast water Method.   The method for regenerating a membrane for producing ballast water according to claim 1, wherein the concentration of the hydrogen peroxide solution is set in the range of 0.2 to 0.5% according to the number of days of navigation of the ship.   The method for regenerating a membrane for ballast water production according to claim 1 or 2, wherein the immersion treatment is performed in a membrane filtration apparatus or in a separately provided immersion tank while the ship is sailing.   4. The method for regenerating a membrane for producing ballast water according to claim 1, wherein the low-concentration hydrogen peroxide solution in the range of 0.2 to 0.5% is produced during navigation of the ship. A filtration membrane device for ship ballast water having a raw water chamber for introducing seawater, a filtration membrane for membrane filtration, and a treatment chamber for storing ship ballast treatment water filtered and separated by the filtration membrane; Consisting of equipment,
The filtration membrane regenerating liquid production apparatus includes a regenerating liquid tank containing hydrogen peroxide water in a range of 0.2 to 0.5%,
Regeneration of a film for producing ballast water, characterized by comprising means for setting a hydrogen peroxide tank concentration according to the number of days of navigation of the ship, and means for creating hydrogen peroxide water having the set concentration apparatus.   The filtration membrane device partitions a tank into a raw water chamber and a treated water chamber by a partition plate, and covers the outer periphery of the porous cylindrical support body having an opening on the processing chamber side in the raw water chamber. A large number of filter cylinders are formed, and seawater that has entered the raw water chamber flows upward in the raw water chamber, and is filtered by the membrane and rises in the filter cylinder as treated water. 6. The apparatus for regenerating a membrane for producing ballast water according to claim 5, wherein the apparatus has a structure for collecting water indoors.

Images