KR101776045B1 - A gas vent system for the ballast water treatment system and a apparatus comprising them - Google Patents

A gas vent system for the ballast water treatment system and a apparatus comprising them Download PDF

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Publication number
KR101776045B1
KR101776045B1 KR1020150157562A KR20150157562A KR101776045B1 KR 101776045 B1 KR101776045 B1 KR 101776045B1 KR 1020150157562 A KR1020150157562 A KR 1020150157562A KR 20150157562 A KR20150157562 A KR 20150157562A KR 101776045 B1 KR101776045 B1 KR 101776045B1
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South Korea
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gas
electrolytic
discharge
fluid
ballast water
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KR1020150157562A
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Korean (ko)
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KR20170054874A (en
Inventor
지석준
김영구
조인태
김창국
이준호
이성민
문성진
김민정
이준태
이광섭
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한라아이엠에스 주식회사
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63J—AUXILIARIES ON VESSELS
    • B63J4/00—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for
    • B63J4/002—Arrangements of installations for treating ballast water, waste water, sewage, sludge, or refuse, or for preventing environmental pollution not otherwise provided for for treating ballast water
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B13/00—Conduits for emptying or ballasting; Self-bailing equipment; Scuppers
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/008—Originating from marine vessels, ships and boats, e.g. bilge water or ballast water

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Ocean & Marine Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Combustion & Propulsion (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Toxicology (AREA)
  • General Chemical & Material Sciences (AREA)
  • Electrochemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)

Abstract

The present invention relates to an electrolytic cell comprising a gas discharging unit configured to discharge inflowing gas to the outside of a ship, a plurality of electrolytic cells and a gas discharging unit so as to allow gas generated in a plurality of electrolytic cells, To a gas discharge system for a ballast water treatment apparatus comprising a plurality of gas passages connected to the ballast water treatment apparatus and a ballast water treatment apparatus including the same.
The gas discharge system for a ballast water treatment apparatus according to the present invention and the ballast water treatment apparatus including the discharge gas discharge apparatus for the ballast water treatment apparatus according to the present invention are each provided with a discharge passage for discharging gas to the rear of each electrolytic cell, There is an effect that the efficiency can be increased.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a gas discharge system for a ballast water treatment apparatus, and a ballast water treatment apparatus including the gas discharge system.

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas discharge system for a ballast water treatment apparatus and a ballast water treatment apparatus including the same, and more particularly to a gas discharge system for efficiently discharging gas generated during ballast water treatment of a ship and a ballast water treatment apparatus .

In general, ships use ballast tanks for the stability and efficiency of propulsion when they are not loaded with cargo. In order to reduce the center of gravity of the ship due to loading and unloading of cargo, To control the flow of ballast water.

Recently, ballast water has been used as a medium for propagating organisms or pathogens in a specific sea area to other seas, and it has become necessary to sterilize ballast water.

Methods of cleaning and sterilizing ballast water have been developed in a variety of ways. Among these methods, sodium hypochlorite is produced by electrolysis of seawater, and the ballast water is treated by using the sodium hypochlorite. As a method for directly electrolyzing the incoming ballast water, Electrolytic methods and indirect electrolysis methods for electrolyzing a part of ballast water have been utilized.

However, when such an electrolysis method is used, gas is generated as a by-product generated by the electrolysis of seawater, and since such gas can not be discharged quickly, the contact area between the electrode and the ballast water is reduced, There was a problem.

US Patent No. 7,244,348

An object of the present invention is to provide a gas discharge system for a ballast water treatment apparatus and a ballast water treatment apparatus including the same, which solves the problem that electrolysis efficiency is reduced due to insufficient gas discharge in a conventional ballast water treatment apparatus.

As a means for solving the above-mentioned problems, there is provided a gas discharge apparatus comprising a gas discharge unit configured to discharge an introduced gas to the outside of a ship, a plurality of electrolytic cells and a gas A gas discharge system for a ballast water treatment apparatus comprising a plurality of gas passages each connecting the discharge portion can be provided.

In this case, the plurality of gas passages may be connected to the upper side of the plurality of electrolytic cells, and the inner diameter of the gas passageway connected to the electrolytic cell located on the rear side of the fluid flow path is connected to the electrolytic cell located in front of the fluid flow path. As shown in FIG.

And at least one of the plurality of gas passages may be connected to the second half of the fluid flow path in each electrolytic cell.

Further, at least one of the plurality of gas passages may be configured to include a fluid movement path extending a predetermined distance upward from a portion connected to each electrolytic bath.

On the other hand, the gas discharging portion includes a gas-liquid separator configured to separate the introduced gas and liquid and discharge them through different paths, and a discharge pipe connected to the gas-liquid separator and forming a moving path through which the separated gas is discharged to the outside of the vessel .

In addition, a ballast pump configured to receive fluid outside the vessel, a ballast tank in fluid communication with the ballast pump and configured to receive the withdrawn fluid, a plurality of electrolyzers configured to produce a sterilizing agent from the brine and supply it to the ballast tank A gas discharge unit configured to discharge gas produced by electrolysis in a plurality of electrolytic cells to the outside of the vessel, and a gas passage connecting the plurality of electrolytic baths and the gas discharge unit, respectively.

Wherein the main piping further comprises a main piping branching from the main piping and forming a path in fluid communication between the ballast pump and the ballast tanks, wherein the plurality of electrolytic tanks are provided on the side stream piping, And the gas passage may be connected to the upper portion of the second half of the fluid flow path of the electrolyzer, respectively.

And the plurality of gas passages may be configured such that the inner diameter of the gas passage connected to the electrolytic cell located behind the fluid flow path is larger than the inner diameter of the gas passage connected to the electrolytic cell located forward of the fluid flow path.

The electrolytic cell includes a shape in which the cross-sectional area in the transverse direction decreases toward the upper side so that the gas can be collected upward in the electrolytic cell. The gas passage is connected to the upper end of the electrolytic cell to discharge the gas collected in the electrolytic bath, And a fluid movement path extending upward by a predetermined distance after being connected.

The gas discharge system for a ballast water treatment apparatus according to the present invention and the ballast water treatment apparatus including the discharge gas discharge apparatus for the ballast water treatment apparatus according to the present invention are each provided with a discharge passage for discharging gas to the rear of each electrolytic cell, There is an effect that the efficiency can be increased.

1 is a conceptual diagram of ballast water treatment apparatus.
Fig. 2 is a conceptual diagram of the ballast water treatment apparatus during de-ballasting.
3 is a view showing an electrolytic bath and a gas discharge system.
Fig. 4 is a view showing the flow of the fluid in the plurality of electrolytic baths of Fig. 3; Fig.
5 is a cross-sectional view of Fig.

Hereinafter, a gas discharge system for a ballast water treatment apparatus and a ballast water treatment apparatus including the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the embodiments, the names of the respective components may be referred to as other names in the art. However, if there is a functional similarity and an equivalence thereof, the modified structure can be regarded as an equivalent structure. In addition, reference numerals added to respective components are described for convenience of explanation. However, the contents of the drawings in the drawings in which these symbols are described do not limit the respective components to the ranges within the drawings. Likewise, even if the embodiment in which the structure on the drawing is partially modified is employed, it can be regarded as an equivalent structure if there is functional similarity and uniformity. Further, in view of the level of ordinary skill in the art, if it is recognized as a component to be included, a description thereof will be omitted.

FIG. 1 is a conceptual view of ballast water treatment apparatus, and FIG. 2 is a conceptual diagram of de-ballasting of the ballast water treatment apparatus.

As shown, the ballast water treatment apparatus includes a ballast pump 10, a pretreatment unit 20, a main pipe 30, a side stream pipe 31, an electrolytic cell 40, a gas discharge system 100, A tank 50, a sensor 60, and a neutralization system 70. The ballast water treatment apparatus is provided on the ship for physically or chemically treating the ballast water treatment apparatus accommodated in the ballast tank (50) of the ship.

Hereinafter, the operation of the ballasting component will be described with reference to FIG.

The ballast pump 10 supplies water to be contained in the ballast tank 50 from the outside of the ship. At this time, the water flowing into the inside of the ship may be seawater when the ship is operated from the sea, or may be the nose when operating from the river.

The ballast tank 50 is a space for receiving the ballast water introduced into the ship, and may be provided in various numbers depending on the type of the ship, and may be provided at various positions.

The main piping 30 is a path for moving the ballast water introduced into the ship by the ballast pump 10 to the ballast tank 50. And the ballast water is moved to the plurality of ballast tanks 50 through the main pipe 30.

Meanwhile, since the ballast pump 10, the ballast tank 50, and the main pipe 30 described above are widely practiced in existing ships, the detailed description of the construction will be omitted.

The pretreatment unit 20 is configured to primarily purify the brine introduced into the ship. Filter, and can be configured to physically process it. At this time, the filter is configured to be backwashable and can be continuously operated.

The electrolytic bath 40 is supplied with electric power to electrolyze the brine, and various materials including sodium hypochlorite, which is a sterilizing agent, are generated from the brine. The electrolytic bath 40 may be composed of a plurality of electrolytic baths depending on the configuration of the system, and may be provided in the side stream piping 31 side in series or in parallel.

The gas (g) exhaust system 100 is configured to exhaust the gas (g) containing hydrogen generated from the electrolytic bath 40. The gas (g) exhaust system 100 is configured to discharge the gas g generated from the electrolytic bath 40 and the gas g contained in the brine that has passed through the electrolytic bath 40. Such a gas (g) exhaust system 100 will be described in detail later.

The sensor 60 is used to measure the concentration of the sterilizing agent produced in the electrolytic bath 40 during ballasting and to adjust the concentration to a suitable concentration in the ballast tank 50 so that it can be sterilized. The concentration of the sterilizing agent may be measured in the side stream piping 31 after passing through the electrolytic bath 40 or the concentration of the sterilizing agent may be measured at a point after the side stream piping 31 and the main piping 30 are joined .

Hereinafter, the operation of the components at the time of de-ballasting will be described with reference to FIG.

D-ballasting refers to the process of discharging the ballast water contained in the ballast tank 50 to the outside of the hull. In the case of D-Ballasting, the ballast pump (10) used in ballasting is used, but the ballast water flow is changed and discharged to the outside of the hull. At this time, the flow path can be changed by controlling a plurality of valves or pumps.

On the other hand, in the case of D-Ballasting, it may happen that the ballast water needs to be discharged at a certain concentration or less according to the standard applied in the area where the ballast water is discharged.

Since the sodium hypochlorite is toxic as a disinfectant, the neutralization system 70 is configured to neutralize and discharge the sodium hypochlorite. The neutralization system 70 may comprise a neutralizer tank, a neutralizer feed pump, and a valve. The concentration of sodium hypochlorite is measured from the sensor 60 and the pump and the valve are controlled so as to be discharged to a predetermined concentration or lower in the ballast water so that the neutralizing agent is injected into the ballast water during the de-ballasting.

The sensor 60 described above can be configured to measure the concentration of bactericide at the time of de-ballasting. The neutralization system 70 may be configured to control the amount of neutralizing agent input using the measured value from the sensor 60. Such a sensor 60 may comprise an electrical and chemical sensor 60.

FIG. 3 is a view showing the electrolytic bath 40 and the gas (g) discharge system of FIGS. 1 and 2, and FIG. 4 is a view showing the flow of the fluid in the plurality of electrolytic baths 40 of FIG.

As shown, the gas exhaust system according to the present invention includes a gas passage 110, a gas-liquid separator 120, a blower (not shown), a gas sensor (not shown), a gas separation chamber 140, And the like.

The gas passage (110) is configured to discharge the gas (g) generated in the electrolytic bath (40). The gas passageway (110) is constituted by a channel through which the fluid flows. Further, since a trace amount of salt water can also flow together with the gas (g) in the inside, it can be composed of a corrosion-resistant material.

One end of the gas passage 110 is connected to each of the electrolytic baths 40 in such a manner that gas (g) generated in each electrolytic bath 40 can be discharged.

Specifically, one end of the gas passage 110 may be connected to the upper side of the electrolytic bath 40 so that the gas g can be separated from the liquid in the electrolytic bath 40 and discharged smoothly. And a channel extending upward from the one end of the gas passage 110 for a predetermined distance. This is for re-flowing the liquid scattered along with the gas (g) into the electrolytic bath (40) through the gas passageway (110). The scattered liquid may vertically rise through the gas passage 110 and then be lowered by gravity, or may flocculate on the wall surface and re-introduced into the electrolytic bath 40, thereby reducing the amount of the liquid flowing out. At this time, the length of the vertical risen at a predetermined distance may be determined in consideration of the installation space inside the ship, the connection relation with the gas-liquid separator 120 to be described later, and the like. However, apart from this, an air-vent having a function of discharging only gas while preventing the vertical rise of the scattered liquid may be provided.

Thereafter, the gas passageway (110) extends to the other end side, and the passages extending from the respective electrolytic baths (40) are combined to form a single flow path. The end of the gas passage 110, which is joined to one flow path, can be in fluid communication with the discharge pipe 130.

The discharge pipe 130 is a path through which the gas g moves and is configured to discharge the gas g separated from the gas-liquid separator 120 and the gas introduced from the gas passage 110 to the outside of the hull.

One end of the discharge pipe 130 is connected to the upper side of the gas-liquid separator 120, and the other end is connected to the outside of the hull. The discharge pipe 130 is configured to communicate with the gas passage 110 to discharge the gas introduced from the gas passage 110 to the outside of the ship.

 The blower (not shown) is configured such that the gas g separated from the gas-liquid separator 120 is diluted with the gas and discharged to the outside of the vessel through the discharge pipe 130. Is a configuration for preventing the hydrogen contained in the gas (g) from exploding.

A gas sensor (not shown) is configured to measure the concentration of hydrogen on the path after the gas separation chamber 140 at the discharge line. Meanwhile, in order to prevent the explosion, the hydrogen concentration is configured to be discharged to a predetermined level or less, and an extra blower is stand-by in case of an emergency.

The gas-liquid separator 120 separates the liquid and the gas introduced into the gas-liquid separator 120 and transfers the liquid to the main pipe 30. The gas is discharged through the discharge pipe 130 to be diluted with the external air, Lt; / RTI > The seawater having passed through the electrolytic bath 40 flows into the gas-liquid separator 120 through the outflow path 32 and the outflow path 32 can be connected to the upper side of the gas-liquid separator 120.

The other end of the gas passage 110 is directly connected to the discharge pipe 130 so that the fluid passing through the gas passage 110 passes only through the gas separation chamber 140. However, The other end of the gas passage 110 is connected to the gas-liquid separator 120 so that the fluid passes through both the gas-liquid separator 120 and the gas-separating chamber 140.

At this time, the gas separation chamber 140 is configured to separate the liquid from the gas (g) that has passed through the gas-liquid separator 120. That is, even a gas separated by the gas-liquid separator 120 may contain a small amount of liquid, and may be provided on the path of the discharge pipe 130 for separating it again. The gas separation chamber 140 is provided with a space in which the liquid and the gas can be separated by the density difference. At this time, the separated seawater may flow into the seesream pipe 31 or directly into the main pipe 30.

The efficiency of the electrolytic bath 40 is determined by the contact area between the electrode 41 and the fluid in the electrolytic bath 40. In this case, It is greatly affected. Therefore, the gas passage 110 is configured to immediately discharge the gas g so that the gas g generated by the electrolysis reduces the contact area of the electrode 41 and the fluid so that the efficiency of the electrolytic bath 40 Can be prevented from being reduced.

Referring to FIG. 4, the fluid flow of two electrolytic cells 40 connected in series is shown. 4 (a) corresponds to the first electrolytic bath 40, and Fig. 4 (b) corresponds to the second electrolytic bath 40. Fig.

The electrolytic bath 40 passing first through the fluid flow path of the brine is the first electrolytic bath 40 and the electrolytic bath 40 passing through the electrolytic bath 40 becomes the second electrolytic bath 40.

The gas passages (110) are connected to the second half of the fluid path in each electrolytic bath (40). 4, the salt water introduced into the first electrolytic bath 40 and the second electrolytic bath 40 is electrolyzed through the electrode 41 and is moved in the right direction, . At this time, the brine is continuously flown into the electrolytic bath 40, and flow in the right direction occurs in the electrolytic bath 40, and the gas g generated at this time rises while moving in the flow direction. That is, the gas g generated by the electrolysis is collected in the latter half of the fluid flow path. In order to facilitate the discharge of the gas g, the gas passage 110 is connected to the rear half of the fluid passage in the electrolytic bath 40 Respectively.

The gas passage 110 is formed such that the inner diameter of the gas passage 110 connected to the electrolytic bath 40 located on the rear side of the fluid flow path is larger than the inner diameter of the gas passage 110 connected to the electrolytic bath 40, . The inner diameter of the first gas passage 110 connected to the first electrolytic bath 40 may be smaller than the inner diameter of the second gas passage 110 connected to the second electrolytic bath 40.

A part of the gas g generated after the electrolysis in the first electrolytic bath 40 is introduced into the second electrolytic bath 40 together with the brine and the electrolytic water generated in the second electrolytic bath 40 And the inner diameter is configured to be relatively large so that the gas (g) can be discharged together.

However, the case where the number of the electrolytic baths 40 is two has been described as an example, but the present invention can be extended even when the number of the electrolytic baths 40 is more than two. For example, in the case of two or more, two electrolytic baths 40 connected in parallel and one electrolytic bath 40 connected in series, that is, three electrolytic baths 40 or four electrolytic baths 40, May be configured in various combinations including two connected electrolytic baths (40).

5 is a cross-sectional view taken along line A-A of Fig. As shown in the drawing, the electrolytic bath 40 having two shapes in cross section is provided, and the structure can be configured such that the area decreases toward the upper side so that gas can be collected on the upper side. As shown in FIG. 5 (a), it may be formed in a circular shape as a whole, and it may have a polygonal shape as shown in FIG.

The gas passage 110 may be provided on the uppermost part of the collecting part in the electrolytic bath 40 to facilitate the discharge of the collected gas g.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, . It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10: Ballast pump 20: Pretreatment unit
30: main piping 31: side stream piping
32: Spillway 40: Electrolyzer
41: Electrode 50: Ballast tank
60: Sensor 70: Neutralization system
100: Gas discharge system
110: Gas cylinder
120: gas-liquid separator
130: discharge pipe
140: gas separation chamber
g: gas

Claims (11)

A gas discharge unit configured to discharge the introduced gas to the outside of the vessel; And
And a plurality of gas passages connecting the one end of the rear half of the plurality of electrolytic cells and the gas discharging unit to each other so that a fluid containing gas generated in a plurality of electrolytic cells that electrolyze the salt water to generate a sterilizing agent can move to the gas discharging unit In addition,
Wherein the gas passage is connected to the gas discharge portion by a path independent of an outflow route from which the brine is discharged from the electrolytic bath. The method according to claim 1,
And the plurality of gas passages are connected to the upper side of the plurality of electrolytic cells, respectively. 3. The method of claim 2,
The plurality of electrolytic cells include two electrolytic cells connected to each other in series,
Wherein the plurality of gas passages are formed such that an inner diameter of a gas passage connected to the electrolytic cell located behind the fluid flow path of the two electrolytic cells is larger than an inner diameter of a gas passage connected to an electrolytic cell located in front of the fluid flow path, A gas discharge system for a ballast water treatment system. delete 3. The method of claim 2,
Wherein at least one of the plurality of gas passages includes a fluid movement path extended upward from a portion connected to each electrolytic cell by a predetermined distance. 3. The method of claim 2,
The gas outlet
A gas-liquid separator configured to separate a gas and a liquid from the introduced fluid and discharge them through different paths; And
And a discharge pipe connected to the gas-liquid separator, the discharge pipe forming a movement path through which the separated gas is discharged to the outside of the vessel. The method according to claim 6,
The gas outlet
An outflow channel through which the brine flows out from the electrolytic bath, and a fluid connected to the gas channel,
Separating the gas and the liquid from the introduced fluid,
Wherein the separated gas and the separated liquid are discharged through different paths. A ballast pump configured to receive fluid outside the vessel;
A ballast tank in fluid communication with the ballast pump and configured to receive the withdrawn fluid;
A plurality of electrolytic baths configured to electrolyze salt water to produce a sterilizing agent;
A gas discharge unit configured to discharge gas generated by electrolysis in the plurality of electrolytic cells to the outside of the vessel;
An outflow passage configured to allow the brine discharged from the electrolytic bath to move; And
And a gas passage connecting the one end of the second half of the plurality of electrolytic cells to the gas discharge portion, wherein the gas passage is formed of a path independent of the outflow route. 9. The method of claim 8,
A main pipe forming a path in fluid communication between the ballast pump and the ballast tank;
Further comprising a side stream piping branched from the main piping,
Wherein the plurality of electrolytic baths are connected on the side stream piping,
And the gas passage is connected to the upper portion of the second half of the fluid flow path of the electrolytic cell. 10. The method of claim 9,
The plurality of electrolytic cells include two electrolytic cells connected to each other in series,
Wherein the plurality of gas passages
Wherein an inner diameter of a gas passage connected to an electrolytic cell located behind a fluid flow path of the two electrolytic cells is larger than an inner diameter of a gas passage connected to an electrolytic cell located forward of the fluid flow path. 10. The method of claim 9,
The electrolytic bath comprises:
And a shape in which the cross-sectional area in the transverse direction decreases as the gas is collected in the electrolytic bath to the upper side,
In the gas passage,
Wherein the electrolytic cell is connected to an upper end of the electrolytic cell to discharge the gas collected in the electrolytic cell,
And a fluid movement path extending upward by a predetermined distance after being connected to the electrolytic cell.
KR1020150157562A 2015-11-10 2015-11-10 A gas vent system for the ballast water treatment system and a apparatus comprising them KR101776045B1 (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101287570B1 (en) * 2013-05-27 2013-07-19 한라아이엠에스 주식회사 Electrolytic cell apparatus for ship ballast water treatment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101287570B1 (en) * 2013-05-27 2013-07-19 한라아이엠에스 주식회사 Electrolytic cell apparatus for ship ballast water treatment

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