KR20180137806A - Water treatment system - Google Patents

Abstract

According to one embodiment of the present invention, provided is a contaminated water treatment system. According to one embodiment of the present invention, the contaminated water treatment system comprises: a washing water discharge pipe for discharging washing water in contact with an exhaust gas in a scrubber, a first cooling unit connected with the washing water discharge pipe and performing heat exchange with the seawater to cool the washing water to precipitate sulfate, a filter unit connected to the washing water discharge pipe at a rear end of the first cooling unit, for separating the precipitated sulfate, and a storage tank connected to the washing water discharge pipe at a rear end of the filter unit, for storing washing water containing nitric acid or nitrate.

Description

[0001] Water treatment system [0002]

The present invention relates to a polluted water treatment system, and more particularly, to a polluted water treatment system capable of treating clean water contaminated with exhaust gas.

Generally, various engines installed on a ship generate power by burning fuel, and the exhaust gas generated in the combustion process of the fuel is harmful substances such as nitrogen oxides (NOx), sulfur oxides (SOx) and fine dusts (PM) . In particular, the emission of nitrogen oxides and sulfur oxides in the exhaust gas has been increasingly recognized by the International Maritime Organization (IMO), an affiliate of the United Nations, ) Are the representative air pollutants subject to emission regulation. In the case of nitrogen oxides, emissions are regulated to 3.4 g / kwh or less in 2016, which is the time when Tier III is in effect. In the case of sulfur oxides, emissions from sulfur dioxide emission control (SECA) Is regulated. Accordingly, various apparatuses and methods for treating the exhaust gas of ships have been introduced. In the case of sulfur oxides, a method of removing the sulfur oxides by a wet scrubber is generally used. When the exhaust gas is oxidized in advance by using hydrogen peroxide, ozone, ultraviolet rays or the like and then brought into gas-liquid contact with the washing water, sulfur oxides and nitrogen oxides are simultaneously reduced .

On the other hand, when the sulfur oxides and the nitrogen oxides are oxidized and dissolved in the washing water, sulfate and nitrates are produced. Since nitrate is subject to regulation on the amount that can be discharged to the sea, clean water containing nitrate of a certain concentration or higher can not be discharged. However, since various engines installed on the ship continuously burn the fuel to generate necessary power and accordingly, the sulfate and nitrate are continuously generated in the process of exhaust gas discharged, a plurality of tanks for storing the fuel must be provided do. Therefore, the cost for installing and maintaining the tank is increased, and a large space is required for arranging a plurality of tanks, thereby reducing the space utilization in the ship.

Korean Patent No. 10-0135417 1998. 01. 13.

An object of the present invention is to provide a contaminated water treatment system capable of treating clean water contaminated by the purification of exhaust gas.

The technical objects of the present invention are not limited to the technical matters mentioned above, and other technical subjects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the present invention, there is provided a contaminated water treatment system including a scrubbing water discharge pipe for discharging scrubbing water in contact with exhaust gas in a scrubber, A filter unit connected to the washing water discharge pipe at the rear end of the first cooling unit and separating the precipitated sulfate from the washing unit; And a storage tank connected to the water discharge pipe for storing the washing water containing nitric acid or nitrate.

The contaminated water treatment system further includes a separation unit interposed between the first cooling unit and the filter unit and separating the washing water containing the precipitated sulfate and the washing water not containing the precipitated sulfate .

The contaminated water treatment system may further include a second cooling unit that is supplied from the separation unit, and that cleanse water not containing the precipitated sulfate is heat-exchanged with the refrigerant to perform secondary cooling to precipitate the sulfate.

The second cooling unit may cool the washing water not containing the precipitated sulfate at 0 to 5 ° C.

The separation unit may include a stirring device.

The contaminated water treatment system may further include a filtering unit connected to the washing water discharge pipe at a front end of the first cooling unit and separating the solid particles contained in the washing water.

The contaminated water treatment system may further include a liquid catalyst separation unit interposed between the filtration unit and the first cooling unit and separating the liquid catalyst contained in the cleaning water.

The liquid catalyst separation unit may circulate the liquid catalyst to the scrubber.

According to the present invention, the sulfate contained in the washing water contaminated by the purification of the exhaust gas is precipitated and separated from the washing water, whereby only the washing water containing nitric acid or nitrate salt can be extracted and stored in the tank. Thus, the size and number of tanks can be reduced, as compared to storing sulphate and nitrate salts, thereby reducing the cost of installing and maintaining the tanks. In addition, the space for arranging the tanks can be reduced, and the space utilization in the ship can be increased.

1 is a block diagram schematically illustrating a contaminated water treatment system according to an embodiment of the present invention.
2 is a graph showing the precipitation distribution of the sulfate according to the temperature when the second cooling unit cools the washing water.
3 is an operational view of the contaminated water treatment system of FIG.

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention, and the manner of achieving them, will be apparent from and elucidated with reference to the embodiments described hereinafter in conjunction with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout the specification.

Hereinafter, a polluted water treatment system according to an embodiment of the present invention will be described in detail with reference to FIG.

The polluted water treatment system according to the embodiment of the present invention is an apparatus for treating the clean water contaminated by the purification of exhaust gas, and can mainly treat contaminated clean water mounted on a ship.

The contaminated water treatment system can extract only the cleansing water containing nitric acid or nitrate and store it in the tank by separating and separating the sulfate contained in the cleansing water contaminated by the purification of the exhaust gas from the cleansing water. Thus, the size and number of tanks can be reduced rather than the way of storing the sulphate and nitrate salts, thereby reducing the cost of installing and maintaining the tanks. In addition, the space for arranging the tanks can be reduced, and the space utilization in the ship can be increased.

Hereinafter, the contaminated water treatment system 1 will be described in detail with reference to Figs. 1 and 2. Fig.

Fig. 1 is a block diagram schematically showing a contaminated water treatment system according to an embodiment of the present invention, and Fig. 2 is a graph showing a precipitation distribution of sulfate according to temperature when the second cooling unit cools the wash water.

The contaminated water treatment system 1 according to the present invention includes a washing water discharge pipe 10, a first cooling unit 20 and a filter unit 30, and a storage tank 40.

The cleaning water discharge pipe 10 is a pipe for discharging cleaning water in contact with the exhaust gas in the scrubber 100. One end of the cleaning water discharge pipe 10 is connected to the scrubber 100 and the other end thereof is connected to a storage tank 40 to be described later.

The scrubber 100 is a device for spraying the cleaning water supplied through the cleaning water supply pipe 120 to the exhaust gas supplied through the exhaust gas pipe 110 to bring the exhaust gas into contact with the cleaning water in a gas-liquid contact, have.

The exhaust gas pipe 110 is a pipe that provides a passage through which exhaust gas moves from a combustion engine (not shown). The exhaust gas pipe 110 is directly connected to the exhaust pipe of the combustion engine and becomes a passage through which hot exhaust gas is moved, It is possible to utilize most of the exhaust heat and to pass through the remaining waste gas. Here, the combustion engine refers to an apparatus that generates various kinds of power required for a ship by burning fuel, and may be formed of, for example, a main engine, a generator, or the like. The exhaust gas pipe 110 may be connected to exhaust pipes of a plurality of combustion engines, and a plurality of combustion engines may selectively operate. Such a combustion engine usually generates fossil fuel to generate power, and thus generates exhaust gas resulting from combustion of fossil fuel. The generated exhaust gas contains a large amount of nitrogen oxides, sulfur oxides, organic substances and fine dusts, and is supplied to the scrubber 100 through an exhaust gas pipe 110 connected to one side of the combustion engine. The exhaust gas pipe 110 is disposed at the lower portion of the scrubber 100 at the end located inside the scrubber 100, and is branched into a plurality of portions to inject the exhaust gas.

The cleansing water supply pipe 120 may supply at least one of seawater or fresh water or mixed water of seawater and fresh water to the scrubber 100 by selectively supplying seawater and fresh water. The cleaning water supply pipe 120 is disposed at an upper portion of the scrubber 100 at an end portion located inside the scrubber 100 and is branched into a plurality of portions to spray the cleaning water in a particulate form. That is, the cleansing water supply pipe 120 disposed at the upper portion of the scrubber 100 sprays the cleansing water toward the lower portion of the scrubber 100 where the exhaust gas pipe 110 is located. Therefore, the cleaning water can effectively contact the exhaust gas flowing through the exhaust gas pipe 110 disposed under the scrubber 100.

As the exhaust gas and the washing water come into vapor-liquid contact within the scrubber 100, contaminants such as nitrogen oxides, sulfur oxides, organic substances and fine dusts contained in the exhaust gas can be removed, and nitrogen oxides, sulfur oxides, And exhaust gas from which pollutants such as fine dust are removed can be discharged to the outside through a separate discharge pipe 130. [ Since the exhaust gas discharged through the discharge pipe 130 is in a state in which contaminants such as nitrogen oxides, sulfur oxides, organic substances, and fine dusts are removed, the exhaust gas can be discharged to the atmosphere in accordance with the exhaust standards.

Cleaning water containing nitrogen oxides, sulfur oxides, organic substances, fine particles, etc. is discharged to the outside of the scrubber 100 through the cleaning water discharge pipe 10 in contact with the exhaust gas containing the pollutant. At this time, the cleaning water can dissolve nitrogen oxides and sulfur oxides, and can form strongly acidic nitric acid and sulfuric acid.

On the other hand, the exhaust gas supplied through the exhaust gas pipe 110 is oxidized and purified first, and then supplied to the scrubber 100 to be purified secondarily. Examples of the method for oxidizing the exhaust gas include a method of oxidizing by pulsed corona discharge, a method of oxidizing by irradiating ultraviolet rays, a method of oxidizing by spraying an oxidizing agent, and the like. When the exhaust gas is oxidized, the nitrogen monoxide contained in the exhaust gas is oxidized to nitrogen dioxide. Since the nitrogen dioxide is easily dissolved in water as compared with the nitrogen monoxide, it can be easily dissolved in the washing water in the scrubber 100 and removed. For example, in the case of oxidizing the exhaust gas by pulsed corona discharge, when the corona discharge is caused by the pulse high voltage, the exhaust gas becomes a plasma state and oxidizing radicals such as ozone and O 2 and OH are generated to oxidize nitrogen oxides or sulfur oxides . Further, when the exhaust gas is oxidized by injecting the oxidizing agent, the liquid oxidizing agent may be made into fine particles, dropletized or vaporized by using a nozzle, an ultrasonic vibrator, a spray, a heating plate or the like to effectively contact the exhaust gas with the oxidizing agent.

The oxidized exhaust gas may be injected into the scrubber 100 before the liquid catalyst is supplied. Since the artificially oxidized exhaust gas is easily reduced to its original state, the liquid catalyst can be injected to keep the exhaust gas in the oxidized state. When the exhaust gas is reduced again, the exhaust gas is not easily dissolved in the washing water in the scrubber 100, so that the exhaust gas must be introduced into the scrubber 100 in an oxidized state. The liquid catalyst is a liquid organic catalyst (LOC) contained in oil such as petroleum or diesel. The weight ratio of water to LOC can be 30 to 70: 70 to 30. By injecting the liquid catalyst into the oxidized exhaust gas, the exhaust gas can be supplied to the scrubber 100 without being reduced again, while maintaining the oxidation state. However, the liquid catalyst is not limited to being injected into the exhaust gas before the scrubber 100 is supplied. For example, the liquid catalyst may be injected into the exhaust gas inside the scrubber 100.

The washing water discharged to the outside of the scrubber 100 through the washing water discharge pipe 10 passes through the filtering unit 70. At this time, at least one pump is provided on the washing water discharge pipe 10 between the scrubber 100 and the filtration unit 70 to pressurize the washing water.

The filtration unit 70 is an apparatus for separating the solid phase particles contained in the washing water and can be connected to the washing water discharge pipe 10 at the front end of the first cooling unit 20 to be described later. The solid phase particles contained in the washing water have sticky properties because of their high viscosity due to organic substances and liquid catalysts. Therefore, when the solid phase particles are not separately removed, they flow together with the rinse water and accumulate inside the rinse water discharge pipe 10 and various devices, which may cause clogging or corrosion of the pipe and corrosion or breakdown of the device . To prevent this, the filtration unit 70 separates the solid particles contained in the washing water, and separates the solid particles using, for example, a filter, a centrifuge, or a gravity separator. When the filtration unit 70 separates the solid particles using a filter, the solid particles can be filtered in the form of a cake.

The washing water in which the solid phase particles have been separated in the filtration section 70 passes through the liquid phase catalyst separation unit 80.

The liquid catalyst separation unit 80 separates the liquid catalyst contained in the washing water and can be interposed between the filtration unit 70 and the first cooling unit 20. [ The liquid catalyst separation unit 80 can separate the liquid catalyst using the difference in specific gravity between the washing water and the liquid catalyst. That is, the liquid catalyst separation unit 80 separates the liquid catalyst contained in the washing water by the gravity separation method. As described above, the liquid catalyst contains oil and has a specific gravity of about 0.85, which is smaller than that of the washing water. Therefore, when the washing water containing the liquid catalyst is supplied to the liquid catalyst separating unit 80, the washing water having a relatively large specific gravity is disposed below the liquid catalyst separating unit 80, and the liquid catalyst having a small specific gravity, And is disposed on the upper side of the separation unit 80 so that the washing water and the liquid catalyst can be completely separated from each other. However, the liquid catalyst separation unit 80 is not limited to separating the liquid catalyst by the gravity separation method, and may be modified in various ways to separate the liquid catalyst contained in the washing water. The liquid catalyst separated from the liquid catalyst separation unit 80 can be circulated to the exhaust gas pipe 110 at the front end of the scrubber 100 or the scrubber 100 and reused.

The cleansing water from which the liquid catalyst is removed in the liquid catalyst separation unit 80 is supplied to the first cooling unit 20.

The first cooling unit 20 can be connected to the washing water discharge pipe 10 at the rear end of the filtration unit 70 by firstly cooling the washing water to precipitate sulfate. The first cooling unit 20 can cool the washing water to about 20 캜 by heat-exchanging the washing water with seawater flowing from the outside. The seawater introduced into the scrubber 100 from the outside and supplied to the scrubber 100 for the use of the washing water is about 20 ° C. The washing water discharged from the scrubber 100 after gas-liquid contact with the exhaust gas at a high temperature is about 50 to 55 ° C. The first cooling unit 20 heat exchanges seawater of about 20 ° C from the outside with wash water of about 50 to 55 ° C to cool the wash water to about 20 ° C and to cool the wash water to about 20 ° C , Some of the sulfate dissolved in the washing water in a liquid state may be precipitated in a solid state. That is, when a relatively large change in solubility is caused by a temperature, the sulfate is partially precipitated in a solid state when the washing water is cooled, and the nitrate having a relatively small change in solubility with temperature is in a liquid state even when the washing water is cooled . By allowing the first cooling unit 20 to naturally cool the washing water through heat exchange between the washing water and the seawater, it is possible to precipitate the sulfate while reducing the cost required for cooling the washing water.

The washing water having passed through the first cooling unit (20) is supplied to the filter unit (30).

The filter unit 30 separates the precipitated sulfate from the washing water and can be connected to the washing water discharge pipe 10 at the rear end of the first cooling unit 20. The filter unit 30 can be formed, for example, as a phase separator to separate the solid sulphate and discharge the separated sulphate to the sea. Since the sulfate is highly soluble in water and no other regulation is fermented, it can be discharged at sea as it is. Particularly, since the solid phase particles and the liquid catalyst included in the washing water are previously removed from the filtration unit 70 and the liquid catalyst separation unit 80, the sulfate separated from the filter unit 30 contains almost no impurities It can be a pure state. However, the filter unit 30 is not limited to being formed as a phase separator, and can be modified into various structures capable of separating the precipitated sulfate from the washing water. For example, the filter unit 30 may be formed of any one of a filter, a centrifuge, and a gravity separator, such as the filtration unit 70. In addition, the present invention is not limited to separating only the sulfate from the filter unit 30, for example, nitrate which is partially precipitated in the solid state in the first cooling unit 20 may be separated as well.

The rinse water from which the sulfate is removed in the filter unit 30 is stored in the storage tank 40.

The storage tank 40 may be connected to the rinse water discharge pipe 10 at the rear end of the filter unit 30 by storing rinse water containing nitrate or nitrate in a liquid state in the solid state. That is, in the storage tank 40, wash water in which nitrate or nitrate in a liquid state is concentrated to a high concentration is stored. Most of the sulfate is removed and only the cleansing water containing nitric acid or nitrate is stored in the storage tank 40 so that the size and number of tanks required can be reduced compared with the case of storing cleansing water containing both sulfate and nitrate, The cost for installing and maintaining the tank can be reduced. In addition, the space for arranging the tanks can be reduced, and the space utilization in the ship can be increased.

The washing water stored in the storage tank 40 can be supplied to a separate treatment facility and processed when the ship reaches the port or the like. For example, nitrate contained in rinse water can be used as a material for fertilizer used in agriculture. As described above, the washing water stored in the storage tank 40 has a high utilization value as a fertilizer material because nitric acid or nitrate is concentrated to a high concentration. In addition, the stored wash water may be diluted with seawater or fresh water on pollution and discharged in a state containing nitrate below the regulated concentration.

On the other hand, a separation unit 50 may be interposed between the first cooling unit 20 and the filter unit 30.

The separation unit 50 separates the washing water having passed through the first cooling unit 20 into washing water containing sulfate and washing water not containing sulfate, and may be formed, for example, as a phase separator. The separation unit 50 may supply the rinse water containing the sulfate to the filter unit 30 and the rinse water not containing the sulfate to the second cooling unit 60.

The second cooling unit 60 cools the washing water not containing the sulphate supplied from the separation unit 50 to secondarily cool the sulphate to precipitate the sulfate. The second cooling unit 60 separates the sulphate from the separation unit 50 through the first pipe 62 And can be connected to the cooler 61 through the second pipe 63. That is, the second cooling unit 60 cools the cleansing water not containing sulfate, which is supplied through the first pipe 62, with the refrigerant circulating through the cooler 61 and the second cooling unit 60 Sulfate is precipitated. At this time, the second cooling unit 60 can cool the washing water not containing sulfate to 0 to 5 占 폚.

More specifically, referring to FIG. 2, about 30% of the sulfate dissolved in the washing water is precipitated at about 20 ° C, and more than 95% is precipitated at 5 ° C. That is, when the washing water is cooled to 20 캜 through the heat exchange with the seawater in the first cooling unit 20, approximately 30% of the sulfate dissolved in the washing water is precipitated. In the second cooling unit 60, , When the washing water is cooled to 0 to 5 ° C, more than 95% of the sulphate dissolved in the washing water is precipitated. At this time, about 10% of the nitrate dissolved in the washing water can be precipitated. In other words, the rinse water cooled to 0-5 ° C contains solid sulphate (95% or more), solid nitrate (about 10%), sulfuric acid or liquid sulphate (less than 5%), Liquid nitrate (about 90%) may be included.

The precipitated sulfate and nitrate are supplied to the separation unit 50 again through the first pipe 62 in the state of being contained in the washing water and the separation unit 50 separates the washing water passing through the second cooling unit 60 The washing water containing solid state sulfate and nitrate is separated into washing water not containing sulfate and nitrate in solid state. At this time, the rinse water containing the solid state sulfate and the nitrate is supplied to the filter unit 30, and the rinse water not containing the solid state sulfate and the nitrate can be supplied again to the second cooling unit 60 . In other words, the separation unit 50 mixes the washing water having passed through the first cooling unit 20 and the second cooling unit 60, and mixes the washing water not containing the solid state sulfate and the nitrate and the washing water containing the solid state sulfate and nitrate To the washing water containing the washing water. The separation unit 50 mixes the washing water that has passed through the first cooling unit 20 with the washing water that has passed through the second cooling unit 60 so that the water contained in the washing water that has passed through the first cooling unit 20 A part of sulfuric acid or a sulfate in a liquid state and a nitrate in a nitric acid or a liquid state may be further precipitated. The separating unit 50 may be provided with an agitating device as required. At least one pump is installed on the first pipe 62 circulating the separating unit 50 and the second cooling unit 60, The water can be pressurized. When the separating unit 50 is provided with the stirring device, the mixing of the washing water that has passed through the first cooling unit 20 and the washing water that has passed through the second cooling unit 20 can be performed more smoothly. Further, the filter unit 30 can separate the precipitated sulfate and nitrate and discharge them to the sea. As described above, since only about 10% of the nitrate is precipitated, it can be discharged to the sea in compliance with the regulation standard.

Hereinafter, with reference to FIG. 3, the operation process of the contaminated water treatment system 1 will be described in more detail.

3 is an operational view of the contaminated water treatment system of FIG.

The contaminated water treatment system 1 according to the present invention can extract only the cleansing water containing nitric acid or nitrate salt and store it in the tank by separating the sulfate contained in the cleansing water contaminated by the purification of the exhaust gas from the cleansing water . Thus, the size and number of conventional tanks that store sulphate and nitrate salts can be reduced, thereby reducing the cost of installing and maintaining the tanks. In addition, the space for arranging the tanks can be reduced, and the space utilization in the ship can be increased.

The exhaust gas and the washing water are respectively supplied to the scrubber 100 through the exhaust gas pipe 110 and the washing water supply pipe 120. The scrubber 100 contacts the exhaust gas and the washing water in a gas- , Sulfur oxides, organic substances, and fine dusts. At this time, the exhaust gas may be supplied to the scrubber 100 in a state in which the liquid catalyst is injected after being oxidized. The exhaust gas from which the nitrogen oxides, the sulfur oxides, the organic substances, and the fine dust are removed is discharged to the atmosphere through the discharge pipe 130, and the rinse water containing nitrogen oxides, sulfur oxides, organic substances, (10) to the outside of the scrubber (100).

The washing water discharged to the outside of the scrubber 100 through the washing water discharge pipe 10 is supplied to the filtration unit 70 to remove the solid phase particles and the washing water from which the solid phase particles have been removed by the filtration unit 70, Unit 80 to remove the liquid catalyst. The liquid catalyst separated from the washing water can be supplied to the exhaust gas pipe 110 in the scrubber 100 or the exhaust gas pipe 110 before the scrubber 100 through another pipe to be reused.

The cleansing water from which the liquid catalyst is removed in the liquid catalyst separation unit 80 is firstly cooled through heat exchange with seawater in the first cooling unit 20. At this time, % Can be precipitated in a solid state. The precipitated sulfate is contained in the washing water and supplied to the separation unit 50. The separation unit 50 separates the washing water containing the sulfate in the solid state and the washing water not containing the sulfate in the solid state to supply the washing water containing the sulfate in the solid state to the filter unit 30, Cleaning water containing no sulfate is supplied to the second cooling unit (60).

The second cooling unit 60 secondarily cools the washing water not containing the sulfate in the solid state through heat exchange with the refrigerant to further precipitate the sulfate, wherein the washing water can be cooled to 0 to 5 ° C . By cooling the wash water to 0 to 5 캜, 95% or more of the sulfate dissolved in the liquid state in the washing water precipitates in a solid state, and 10% of the nitrate dissolved in the liquid state can be precipitated in a solid state. The precipitated sulfate and nitrate are contained in the washing water and supplied to the separation unit 50 again. The separation unit 50 mixes the washing water having passed through the first cooling unit 20 and the second cooling unit 60 to supply the washing water containing the solid state sulfate and the nitrate to the filter unit 30 .

The filter unit 30 separates the sulfate and nitrate in the solid state from the washing water and discharges the water to the sea, and the washing water containing no solid sulfate and nitrate, that is, a small amount of sulfuric acid or liquid sulfate, The washing water containing nitric acid or a liquid nitrate is supplied to the storage tank 40. As described above, about 95% or more of the sulfate dissolved in the washing water in the liquid state is precipitated in a solid state and discharged to the sea. Therefore, nitrate or nitrate in the liquid state is concentrated in the storage tank 40 Can be stored. The stored high concentration of nitrate is discharged to the sea in a state where it is treated in the storage tank 40, a port or the like, mixed with the washing water on the pollution, and diluted.

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, You will understand. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

1: contaminated water treatment system 10: rinse water discharge pipe
20: first cooling unit 30: filter unit
40: Storage tank 50: Separation unit
60: second cooling unit 61: cooler
62: first pipe 63: second pipe
70: filtration unit 80: liquid phase catalyst separation unit
100: scrubber 110: exhaust gas pipe
120: cleaning water supply pipe 130: discharge pipe

Claims (8)

A rinse water discharge pipe for discharging rinse water in contact with the exhaust gas in the scrubber;
A first cooling unit connected to the washing water discharge pipe and performing heat exchange with seawater to primarily cool the washing water to precipitate sulfate;
A filter unit connected to the washing water discharge pipe at a downstream end of the first cooling unit and separating the precipitated sulfate; And
And a storage tank connected to the rinse water discharge pipe at a rear end of the filter unit and storing the rinse water containing nitric acid or nitrate. The method according to claim 1, further comprising a separation unit interposed between the first cooling unit and the filter unit, the separation unit separating the washing water containing the precipitated sulfate and the washing water not containing the precipitated sulfate, Water treatment system. 3. The contaminated water treatment system according to claim 2, further comprising a second cooling unit supplied from the separation unit, the second cooling unit performing heat exchange with the coolant not containing the precipitated sulfate and performing a second cooling to precipitate the sulfate. The contaminated water treatment system according to claim 3, wherein the second cooling unit cools the washing water not containing the precipitated sulfate to 0 to 5 캜. The contaminated water treatment system according to claim 2, wherein the separation unit includes an agitation device. The contaminated water treatment system according to claim 1, further comprising a filtering part connected to the washing water discharge pipe at a front end of the first cooling unit and separating the solid particles contained in the washing water. The contaminated water treatment system according to claim 6, further comprising a liquid catalyst separation unit interposed between the filtration unit and the first cooling unit, for separating the liquid catalyst contained in the cleaning water. The contaminated water treatment system according to claim 7, wherein the liquid catalyst separation unit circulates the liquid catalyst to the scrubber.

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