KR20200003088A - Wastewater Treatment System and Ship - Google Patents

Abstract

A wastewater treatment system according to one embodiment of the present invention is a wastewater treatment system for purifying a washing liquid discharged from a scrubber, the holding tank having a tank body temporarily holding the washing liquid discharged from the scrubber, and a washing liquid supplied from the holding tank. And a wastewater treatment unit for purifying the wastewater, wherein the discharge per unit time of the washing liquid discharged from the scrubber is the maximum discharge in a predetermined period, and the supply amount of the washing liquid per unit time of the washing liquid supplied from the holding tank to the wastewater treatment unit is determined by It is controlled to be less than the maximum emissions.

Description

Wastewater Treatment System and Ship

The present invention relates to wastewater treatment systems and vessels.

In order for a ship to navigate the Emission Control Area (ECA) set by the International Maritime Organization (IMO), it is necessary to specify the amount of NOx emitted from the engine. It is necessary to reduce until. As a technique for reducing NOx, there is an exhaust gas recirculation (EGR) technique in which exhaust gas is returned to an engine. However, since a large marine engine uses heavy oil as fuel, the exhaust gas (EGR gas) refluxed to the engine contains a large amount of suspended particulate matter which adversely affects the engine such as carbon. Therefore, the scrubber which wash | cleans EGR gas with a washing | cleaning liquid is provided in the EGR unit of the engine system for large ships.

The cleaning liquid used in the scrubber is discharged to the sea, but since the cleaning liquid contains a lot of particles such as soot (solid particles such as soot) (hereinafter referred to as "polluted particles"), it cannot be discharged to the sea as it is. . Therefore, the washing | cleaning liquid used by the scrubber is sent to a wastewater treatment system, and it discharges to sea after the purification process which isolates and removes a contaminant particle from the wastewater treatment part comprised by the centrifuge etc. (refer patent document 1).

Japanese Patent Laid-Open No. 2013-255876

By the way, since the wastewater treatment part of the wastewater treatment system requires the ability to continuously purify the cleaning liquid discharged from the scrubber, the wastewater treatment part tends to be enlarged and complicated. Therefore, an object of the present invention is to provide a wastewater treatment system and a ship which can be miniaturized or simplified.

A wastewater treatment system of one embodiment of the present invention is a wastewater treatment system for purifying a washing liquid discharged from a scrubber, the holding tank having a tank body temporarily holding the washing liquid discharged from the scrubber, and supplied from the holding tank. A wastewater treatment unit for purifying the cleaned cleaning liquid, wherein the discharge per unit time of the cleaning liquid discharged from the scrubber is a maximum discharge in a predetermined period, and the supply amount of the cleaning liquid per unit time of the cleaning liquid supplied from the holding tank to the wastewater treatment unit is all It is controlled to be less than the maximum discharge of the scrubber over a period of time.

According to this structure, since the holding tank functions as a buffer and the supply amount of the cleaning liquid supplied to the wastewater treatment unit can be leveled, the wastewater treatment unit does not need a processing capacity that can correspond to the maximum discharge amount of the scrubber. As a result, the wastewater treatment unit can be miniaturized or simplified.

In the wastewater treatment system, the holding tank is provided at a portion having a low concentration of contaminated particles, among a portion having a high concentration of contaminating particles and a portion having a low concentration of contaminating particles generated by temporarily holding the cleaning liquid. You may be comprised so that a suitable washing | cleaning liquid may be supplied to the said wastewater processing part preferentially.

According to this structure, since the washing | cleaning liquid with low density | concentration of contaminant particle is preferentially supplied to a wastewater treatment part, the load of the purification process in a wastewater treatment part can be reduced.

In the wastewater treatment system, the tank main body may have an outlet through which the cleaning liquid supplied to the wastewater treatment unit flows out, and the outlet may be located below the tank body.

The contaminated particles include floating particles which float in the cleaning liquid, in addition to the settled particles that settle in the cleaning liquid. In addition, the ratio of these settled particles and floating particles differs depending on the fuel used and the like. Then, when most of the contaminated particles contained in the cleaning liquid are floating particles, the holding liquid is temporarily suspended in the holding tank, and the concentration of the contaminating particles increases near the liquid level of the cleaning liquid, and the concentration of the contaminating particles decreases in other parts. . In this case, if the outlet port is located below the tank main body as described above, the washing liquid corresponding to the low concentration of the contaminant particles can be preferentially supplied to the wastewater treatment unit. As a result, the load of the purification process in the wastewater treatment unit can be reduced.

In the wastewater treatment system, the holding tank has a floating member floating on the liquid level of the cleaning liquid held by the tank body, and a suction port for feeding the cleaning liquid held by the tank body, wherein the cleaning liquid sucked from the suction port is A suction pipe supplied to the wastewater treatment unit may be provided, and the suction pipe may be attached to the floating member, and the suction port may be displaced according to the displacement of the floating member.

According to this configuration, since the suction port of the suction pipe is displaced following the level of the cleaning liquid, the cleaning liquid can be continuously supplied to the wastewater treatment unit even if the level of the cleaning liquid in the holding tank changes.

In the wastewater treatment system, the suction port may be located at a position corresponding to the lower surface of the floating member.

According to this configuration, since the suction port sucks the cleaning liquid near the liquid level of the cleaning liquid, when most of the contaminant particles included in the cleaning liquid are precipitated particles, the cleaning liquid corresponding to the low concentration of the contaminated particles is preferentially supplied to the wastewater treatment unit. Can be.

In the wastewater treatment system, the suction port may be located at a position away from the floating member by a predetermined distance.

According to this constitution, even when a large amount of settling particles and floating particles are included in the cleaning liquid, the suction port can suck the cleaning liquid away from the settling particles and the floating particles. That is, even when a large amount of settling particles and floating particles are included in the cleaning liquid, the cleaning liquid corresponding to the low concentration of the contaminating particles can be preferentially supplied to the wastewater treatment unit.

In the wastewater treatment system, the floating member may be a plate-shaped member that covers the liquid level of the cleaning liquid held by the tank body, and may be configured to maintain an angle with respect to the tank body.

According to this structure, even when the whole holding tank shakes, for example, fluctuation | variation of the washing | cleaning liquid with respect to a tank main body can be suppressed, and the internal flow of a washing | cleaning liquid can be suppressed. Therefore, it is possible to prevent the contaminant particles once separated from the cleaning liquid from being dispersed in the cleaning liquid again by shaking the holding tank. As a result, the amount of contaminant particles contained in the cleaning liquid supplied to the wastewater treatment unit can be suppressed, and the load of the purification process in the wastewater treatment unit can be reduced.

In the wastewater treatment system, the holding tank has a first partition plate for partitioning the inside of the tank body, and the first partition plate includes an inflow area in which an inlet through which the cleaning liquid discharged from the scrubber flows is installed, and the An outflow region provided with an outlet for outflow of the cleaning liquid supplied to the wastewater treatment unit may be partitioned, and a cleaning liquid may be flowed between the inflow region and the outflow region, and the floating member may be provided in the outflow region.

When the washing | cleaning liquid discharged from a scrubber flows into a holding tank, dissolved gas will generate | occur | produce in a washing | cleaning liquid by pressure reduction, and the bubble contained in a washing | cleaning liquid will expand | swell. On the other hand, according to the said structure, dissolved gas and air which comprise a bubble do not enter in the outflow area | region in which the floating member was installed. Therefore, the base layer can be prevented from being formed between the floating member and the cleaning liquid, and as a result, the effect of suppressing the internal flow of the cleaning liquid by the floating member can be maintained.

In the wastewater treatment system, the holding tank partitions the inside of the tank body and has a plurality of second partition plates that partition each region, and the cleaning liquid may be circulated between the regions.

According to this structure, since the inside of a tank main body is divided into several small area | regions, even if the whole holding tank shakes, the internal flow of a washing | cleaning liquid can be suppressed. Thereby, the quantity of the contaminant contained in the washing | cleaning liquid supplied to a wastewater treatment part can be suppressed, and the load of the purification process in a wastewater treatment part can be reduced.

The ship of one embodiment of the present invention includes the wastewater treatment system.

According to this configuration, since the wastewater treatment system is provided, the wastewater treatment unit can be miniaturized or simplified.

In the ship, a part of the tank body may be formed by a part of the hull.

According to this structure, since a part of tank body is formed by a part of hull, manufacturing cost of a tank main body can be reduced and the internal space of a ship body can be utilized effectively.

In the ship, the holding tank may be located at the bottom of the ship.

According to this structure, the space which is difficult to use in the vicinity of a ship bottom divided by the curved ship bottom can be used effectively.

In the ship, the holding tank may be provided in a steering chamber or a deck.

Here, since the steering gear chamber is located above the key, sufficient space cannot be secured, and thus it cannot be effectively used in many cases. Therefore, dead space can be effectively utilized by providing a holding tank with a high degree of freedom in shape in the steering chamber. In addition, by providing the holding tank to the deck, the work of discharging the contaminated particles remaining in the holding tank can be easily performed.

In the vessel, the exhaust gas cleaned by the scrubber is an EGR gas refluxed to the engine, and the predetermined period during which the discharge per unit time of the cleaning liquid discharged from the scrubber becomes the maximum discharge is a period in which the EGR rate is equal to or greater than a predetermined value. good.

According to this structure, the discharge per unit time of the cleaning liquid discharged from the scrubber becomes the maximum discharge in the period in which the EGR rate becomes more than a predetermined value, while the discharge per unit time of the cleaning liquid discharged from the scrubber decreases in other periods. Therefore, the supply amount of the washing | cleaning liquid supplied to a wastewater treatment part can be leveled, and also the size of a wastewater treatment part can be reduced or simplified.

In the said ship, when the said ship navigates in ECA, you may control so that the said EGR rate may become more than predetermined value.

When a ship sails in and out of ECA, it can reduce the washing | cleaning liquid in the holding tank collected when the ship sailed in ECA by performing a purification process when a ship sails out of ECA. Therefore, according to the above structure, the wastewater treatment unit can be miniaturized or simplified.

As described above, according to the wastewater treatment system and the vessel, the wastewater treatment unit can be miniaturized or simplified.

1 is a schematic diagram of a ship according to a first embodiment.
2 is a schematic diagram of a wastewater treatment system according to a first embodiment.
3 is a schematic diagram of a wastewater treatment system according to a second embodiment.
4 is a schematic diagram of a wastewater treatment system according to a third embodiment.
5 is a schematic diagram of a wastewater treatment system according to a fourth embodiment.
6 is a schematic diagram of a wastewater treatment system according to a fifth embodiment.

 (First embodiment)

First, with reference to FIG. 1 and FIG. 2, the wastewater treatment system 100 which concerns on 1st Embodiment is demonstrated. In addition, below, the same code | symbol is attached | subjected to the same or corresponding component, and the overlapping description is abbreviate | omitted.

<Ship>

First, the ship 101 in which the wastewater treatment system 100 is mounted is demonstrated. 1 is a schematic diagram of a vessel 101. As shown in FIG. 1, the vessel 101 includes an engine system 110 and a wastewater treatment system 100.

The engine system 110 includes an engine 111 for rotating the screw 103 provided in the hull 102 as a two-stroke diesel engine, a scavenging flow passage 112 for supplying the gas to the engine 111, and an engine ( An exhaust passage 113 for discharging the exhaust gas discharged from the ship 111, a supercharger 114 for boosting new air collected by the exhaust gas and driven by the energy of the exhaust gas, and an exhaust passage 113. The EGR unit 115 which extracts exhaust gas and supplies it to the scavenging flow path 112 as EGR gas is provided.

In the engine system 110 of the present embodiment, the oxygen concentration of the scavenging gas supplied to the engine 111 is reduced by mixing the fresh air and the EGR gas into the scavenging gas by the EGR unit 115. Thereby, the combustion temperature in the engine 111 falls and the generation amount of NOx which arises in the engine 111 can be suppressed. In addition, the ratio (EGR rate) of the EGR gas with respect to the whole scavenging gas changes with the area | region which the ship 101 sails.

The EGR unit 115 includes an EGR flow path 116 connecting the exhaust flow path 113 and the scavenging flow path 112, a scrubber 117 provided in the EGR flow path 116 to clean the EGR gas using a cleaning liquid; The EGR gas cooler 118 that cools the EGR gas, the EGR water mist catcher 119 that collects the condensed water generated by the EGR gas cooler 118, and the EGR gas are boosted and supplied to the scavenging flow path 112. The EGR blower 120 is provided. In addition, the EGR rate of the scavenging gas can be controlled by the EGR blower 120.

As described above, the scrubber 117 of the EGR unit 115 cleans the EGR gas (that is, the exhaust gas). The cleaning liquid used in the scrubber 117 is discharged into the sea, but since the cleaning liquid contains a lot of particles such as dust (polluted particles), it cannot be discharged to the sea as it is. Therefore, the washing | cleaning liquid discharged from the scrubber 117 is discharged to the sea after the purification process which isolate | separates and removes a contaminant particle from the wastewater treatment system 100. Hereinafter, the wastewater treatment system 100 will be described.

Wastewater Treatment System

Next, the wastewater treatment system 100 will be described. The wastewater treatment system 100 includes a holding tank 10 that temporarily holds the washing liquid discharged from the scrubber 117, a wastewater treatment unit 20 for purifying the washing liquid, and a wastewater treatment unit 20 in the holding tank 10. ), A supply pump 30 for supplying the cleaning liquid.

Here, the discharge per unit time (hereinafter, simply referred to as "discharge amount") of the washing liquid discharged from the scrubber 117 fluctuates depending on the operating condition of the scrubber 117. Specifically, since the flow rate of the EGR gas becomes maximum when the EGR ratio is maximum, the discharge amount from the scrubber 117 is the maximum discharge amount at this time.

On the other hand, the supply amount per unit time of the cleaning liquid supplied from the holding tank 10 to the wastewater treatment unit 20 (hereinafter, simply referred to as "supply amount") is controlled to be less than the maximum discharge amount of the scrubber 117 over the entire period. have. This control is performed by the feed pump 30. However, a control valve may be provided between the holding tank 10 and the wastewater treatment unit 20, and the control may be performed by the control valve. In addition, sludge generated in the wastewater treatment unit 20 (contaminated by contaminating particles) is discharged to the holding tank 10 through a pipe (not shown) by performing the purification treatment.

As described above, the supply amount of the washing liquid supplied to the wastewater treatment unit 20 can be made smaller than the maximum discharge amount of the scrubber 117 because the holding tank 10 serves as a buffer. Thereby, since the supply amount of the washing | cleaning liquid supplied to the wastewater treatment part 20 can be leveled, the wastewater treatment part 20 does not need to have the processing capability which can respond to the maximum discharge amount of the scrubber 117. As shown in FIG. Furthermore, in this embodiment, since the washing | cleaning liquid is temporarily hold | maintained in the holding tank 10, the washing | cleaning liquid and contaminant particle from which a specific gravity differs are separated between them. Therefore, contaminant particles contained in the cleaning liquid supplied to the wastewater treatment unit 20 can be reduced, and the load of the purification treatment in the wastewater treatment unit 20 can be reduced. As a result, the wastewater treatment unit 20 can be miniaturized or simplified.

In addition, although the centrifugal separator was conventionally employ | adopted as the wastewater treatment part 20, the membrane processing apparatus (filter) which does not require a power source is employ | adopted in this embodiment instead of the centrifugal separator. That is, in this embodiment, the wastewater treatment part 20 has been simplified. In addition, although the centrifuge may be employ | adopted as the wastewater treatment part 20, in this case, the wastewater treatment part 20 can be miniaturized by employ | adopting a thing with a lower processing capability compared with the conventional centrifugal separator.

<Holding tank>

Next, the structure of the holding tank 10 is demonstrated in detail. 2 is a schematic diagram of a wastewater treatment system 100. As shown in FIG. 2, the holding tank 10 of this embodiment has the tank main body 11, the floating member 12, and the suction pipe 13. As shown in FIG.

The tank main body 11 is a part which holds a washing | cleaning liquid. A part of the tank main body 11 is formed by a part of the hull 102. Specifically, the bottom of the tank main body 10 is formed at the bottom of the hull 102. The bottom of the ship body 102 has a curved shape which is convex downward when seen from the cross section perpendicular | vertical to the front-back direction. The tank main body 11 is formed using the ship bottom of such a shape. Therefore, according to this embodiment, the space near a ship bottom which has a distorted shape can be utilized effectively.

In addition, the tank main body 11 has an inlet port 14 formed in the side wall portion and into which the cleaning liquid discharged from the scrubber 117 flows, and an outlet port through which the cleaning liquid formed in the side wall portion and supplied to the wastewater treatment unit 20 flows out. And an air hole 16 formed in the ceiling and passing through the ship. Moreover, since the inside of the scrubber 117 is high pressure, when the washing | cleaning liquid of the scrubber 117 flows into the tank main body 11, and a pressure will fall, dissolved gas will arise in a washing | cleaning liquid, and the bubble contained in a washing liquid will expand | expand. The air constituting the generated dissolved gas and bubbles is discharged out of the ship through the air port 16.

The floating member 12 is a member having a specific gravity smaller than that of the cleaning liquid and floating on the liquid level of the cleaning liquid held by the tank main body 11. Since the floating member 12 floats on the liquid level of the cleaning liquid, even if the amount of the cleaning liquid changes and the liquid surface is displaced up and down, the floating member 12 is displaced up and down following it.

The suction pipe 13 is flexible, and the proximal end is attached to the outlet 15 of the tank main body 11, and the distal end is attached to the floating member 12. The suction pipe 13 has a suction port 17 at its tip, and the suction port 17 sucks the cleaning liquid held by the tank body 11. The washing liquid sucked from the suction pipe 17 is supplied to the wastewater treatment unit 20 through the outlet 15 and the supply pump 30.

In addition, in this embodiment, the suction port 17 is located in the position corresponding to the lower surface of the floating member 12. As shown in FIG. Therefore, the suction port 17 is always located near the liquid level of the cleaning liquid. As a result, the suction port 17 can always suck the cleaning liquid regardless of the level of the cleaning liquid, and can supply the sucked cleaning liquid to the wastewater treatment unit 20.

Here, the contaminated particles contained in the cleaning liquid are divided into sedimented particles 151 having a specific gravity higher than that of the cleaning liquid, and floating particles 152 having a smaller specific gravity than the cleaning liquid (see FIG. 3 and the like). The settling particles 151 settle in the cleaning liquid, and the floating particles 152 float in the cleaning liquid. That is, the holding tank 10 temporarily holds the cleaning liquid, so that the inside of the cleaning liquid is divided into a portion having a high concentration of contaminated particles and a portion having a low concentration of contaminating particles. In addition, the ratio of the sedimentation particle | grains 151 and the floating particle | grains 152 differs with the fuel used etc. which are used by the engine 11.

In this embodiment, it is assumed that most of the contaminant particles contained in the cleaning liquid are precipitated particles 151. That is, in this embodiment, the lower part of the washing | cleaning liquid which the holding tank 10 hold | maintains becomes a part with a high density | concentration of contaminant particle, and the parts other than the lower part of a washing | cleaning liquid become a part with low concentration of contaminating particle. Then, in this embodiment, since the suction port 17 is always located near the liquid level of the cleaning liquid, the cleaning liquid corresponding to the portion having a low concentration of contaminant particles is preferentially supplied to the wastewater treatment unit 20. Therefore, contaminant particles contained in the cleaning liquid supplied to the wastewater treatment unit 20 can be reduced, and the load of the purification process by the wastewater treatment unit 20 can be reduced.

<Application Example>

Next, operation examples of the wastewater treatment system 100 and the vessel 101 according to the present embodiment will be described. In this case, the vessel 101 departs from the first port in the ECA (air pollutant emission control area), passes through the ocean outside the ECA, and enters the second port in the ECA. In addition, when the ship 101 leaves the 1st port, the holding tank 10 shall be empty. In addition, this ECA is set in a coastal area close to the land, and is a sea area with a strict emission control of pollutants including NOx.

First, since the ship 101 sails in the ECA for a while after leaving the first port, the EGR is performed to reduce the NOx discharged from the engine 111. Therefore, the discharge amount of the cleaning liquid discharged from the scrubber 117 is large, and the discharge amount is the maximum discharge amount.

The washing liquid discharged from the scrubber 117 flows into the holding tank 10, and the holding tank 10 holds the washing liquid. On the other hand, although the cleaning liquid is supplied to the wastewater treatment unit 20 through the holding tank 10 to perform the purification process, the supply amount to the wastewater treatment unit 20 is less than the maximum discharge amount of the scrubber 117. Therefore, in the period during which the vessel 101 is sailing in the ECA, the amount of the washing liquid held by the holding tank 10 gradually increases.

Thereafter, the ship 101 leaves the ECA and navigates outside the ECA. Outside the ECA, since the NOx emission regulation is relatively generous, the EGR is stopped when the vessel 101 sails out of the ECA (at this time, the EGR rate is 0%). Therefore, the cleaning liquid is not discharged from the scrubber 117. On the other hand, the cleaning liquid is continuously supplied to the wastewater treatment unit 20. As a result, the amount of the washing liquid held by the holding tank 10 gradually decreases. And when the washing | cleaning liquid withholded by the holding tank 10 becomes below a fixed amount, supply of the washing | cleaning liquid to the wastewater treatment part 20 is stopped. At this time, the sludge discharged from the contaminated particles (sedimentation particles 151) and the wastewater treatment unit 20 remains in the holding tank 10.

The vessel 101 then enters the ECA again towards the second port. At this time, EGR is resumed and NOx emissions are suppressed. Therefore, the discharge amount of the cleaning liquid discharged from the scrubber 117 again becomes the maximum discharge amount. On the other hand, the wastewater treatment unit 20 is supplied with the cleaning liquid from the holding tank 10 to resume the purification process. However, the supply amount of the cleaning liquid to the wastewater treatment unit 20 is smaller than the maximum discharge amount of the scrubber 117. Therefore, the amount of the washing liquid held by the holding tank 10 increases again.

Thereafter, the vessel 101 enters the second port. Even after the vessel 101 enters the second port, the washing liquid is supplied from the holding tank 10 to the wastewater treatment unit 20, and the washing liquid subjected to the washing treatment is discharged to the sea. After the amount of the washing liquid held by the holding tank 10 becomes less than or equal to a predetermined amount, the holding tank 10 is unloaded by sucking the settling particles 151 and the sludge remaining in the holding tank 10 with a hose. Empty (10).

The above is the operation example of the wastewater treatment system 100 and the ship 101 which concern on this embodiment. However, the wastewater treatment system 100 and the vessel 101 may perform operations other than this. For example, in the above operation example, the cleaning solution was supplied to the wastewater treatment unit 20 while the vessel 101 sailed in the ECA after leaving the first port, but the vessel 101 sailed in the ECA. The cleaning liquid may be supplied to the wastewater treatment unit 20 after the ship 101 exits the ECA without supplying the cleaning liquid to the wastewater treatment unit 20 during this time. In this case, since the period for which the cleaning liquid is held in the holding tank 10 becomes long, more contaminant particles can be separated from the cleaning liquid. As a result, the amount of contaminant particles contained in the cleaning liquid supplied to the wastewater treatment unit 20 can be reduced, and the load of the purification process by the wastewater treatment unit 20 can be reduced.

In the above operation example, the EGR was stopped when the vessel 100 sailed out of the ECA, but when the vessel 101 sailed out of the ECA, the EGR was lowered at a lower EGR rate than when the vessel 101 sailed inside the ECA. May be performed. Even in this case, it is possible to reduce the washing liquid held by the holding tank 10 in the period in which the vessel 101 sails out of the ECA.

 (2nd embodiment)

Next, the wastewater treatment system 200 according to the second embodiment will be described. 3 is a schematic diagram of a wastewater treatment system 200 according to a second embodiment. As shown in FIG. 3, since the holding tank 10 does not have the floating member 12 and the suction pipe 13 (refer FIG. 2), the wastewater treatment system 200 which concerns on 2nd Embodiment is a 1st thing. The configuration differs from the wastewater treatment system 100 according to the first embodiment.

In the wastewater treatment system 200 according to the present embodiment, the outlet 15 is located below the tank main body 11, and the washing liquid held by the holding tank 10 flows directly through the outlet 15. The wastewater treatment unit 20 is supplied to the wastewater treatment unit 20. According to the holding tank 10 of this embodiment, a structure is simple compared with the holding tank 10 of 1st Embodiment, and a washing | cleaning liquid flows out from the lower part of the tank main body 11, and to the wastewater treatment part 20 is carried out. Since it is supplied, most of the contaminant particles are effective in the case of floating particles 152.

That is, when most of the contaminated particles included in the cleaning liquid are floating particles 152, the upper portion of the cleaning liquid becomes a portion having a high concentration of contaminated particles, and the portion other than the upper portion of the cleaning liquid is a portion having a low concentration of contaminating particles. In this regard, according to the present embodiment, the washing liquid corresponding to the portion having a low concentration of contaminated particles is preferentially supplied to the wastewater treatment unit 20, so that the load of the purification treatment by the wastewater treatment unit 20 can be reduced. In addition, the lower part of the tank main body 11 in which the outlet port 15 is located means the part located in the lowest part when the tank main body 11 is divided into three at equal intervals in an up-down direction, for example.

 (Third embodiment)

Next, a wastewater treatment system 300 according to the third embodiment will be described. 4 is a schematic diagram of a wastewater treatment system 300 according to a third embodiment. As shown in FIG. 4, in the wastewater treatment system 300 according to the third embodiment, the configuration of the floating member 12 of the holding tank 10 is that of the wastewater treatment system 100 according to the first embodiment. different.

The floating member 12 of this embodiment is a plate-shaped member, and is extended in the whole inside of the holding tank 10. As shown in FIG. In addition, in the horizontal section, the outer circumference of the floating member 12 coincides with the inner circumference of the side wall portion of the holding tank 10, and the floating member 12 covers the entire liquid level of the cleaning liquid held by the holding tank 10. have. Furthermore, the thickness of the floating member 12 is thick, and has a thickness dimension that cannot be tilted in the tank body 11. That is, the floating member 12 is comprised so that it can move along the side wall part, maintaining the state perpendicular | vertical to the side wall part of the tank main body 11.

Therefore, when the ship 101 oscillates and the holding tank 10 inclines, the floating member 12 also inclines, and the liquid level of the washing | cleaning liquid in the holding tank 10 also inclines not horizontal. Therefore, even if the holding tank 10 is inclined, the liquid level of the cleaning liquid does not change with respect to the holding tank 10. Furthermore, since the floating member 12 covers the liquid level of the cleaning liquid, the liquid surface of the cleaning liquid does not wave. As a result, according to this embodiment, the internal flow of a washing | cleaning liquid can be suppressed and it can suppress that the contaminant particle isolate | separated from the washing | cleaning liquid disperse | distributes again to a washing | cleaning liquid.

However, when the cleaning liquid discharged from the scrubber 117 flows into the tank main body 11, dissolved gas is generated and bubbles are expanded. Thus, when the liquid surface of the cleaning liquid is covered with the floating member 12, the dissolved gas and bubbles are formed. There is a fear that air is collected between the cleaning liquid and the floating member 12 and a space is generated (base layer is formed). In this case, the effect of suppressing the internal flow of the cleaning liquid by the floating member 12 cannot be maintained.

Therefore, in this embodiment, the shear tank 40 in which the inside is open | released to the atmosphere between the scrubber 117 and the holding tank 10, ie, upstream of the holding tank 10, is provided. As a result, the washing liquid discharged from the scrubber 117 is decompressed and degassed in the shear tank 40, and the dissolved tank does not generate dissolved gas and bubbles are not expanded in the holding tank 10. A base layer is not formed between 12 and a washing | cleaning liquid. Therefore, the effect of suppressing the internal flow of the cleaning liquid by the floating member 12 is maintained.

Further, in the present embodiment, the suction port 17 is located at a position away from the floating member 12 by a predetermined distance. According to this configuration, even when a large amount of settling particles 151 and floating particles 152 are included in the cleaning liquid, the suction pipe 17 can suck the cleaning liquid while avoiding the settling particles 151 and the floating particles 152. In other words, the cleaning liquid corresponding to the low concentration of the contaminated particles can be preferentially sucked out. Therefore, according to the above configuration, the amount of the sedimentation particles 151 and the floating particles 152 included in the cleaning liquid supplied to the wastewater treatment unit 20 can be reduced, and the load of the purification treatment in the wastewater treatment unit 20 can be reduced. Can be.

In addition, in this embodiment, the holding tank 10 supports the floating member 12 at a predetermined height position so that the suction port 17 does not contact the bottom of the tank main body 11 when the level of the cleaning liquid is low. The stopper 18 is provided.

In addition, in this embodiment, although the angle of the floating member 12 with respect to the tank main body 11 is maintained by making the thickness of the floating member 12 thick, you may employ | adopt another structure. For example, a rail extending in the vertical direction is provided in the tank body 11, and the floating member 12 moves along the rail, so that the angle of the floating member 12 with respect to the tank main body 11 is maintained. You may employ | adopt the structure which makes it possible.

 (4th Embodiment)

Next, the wastewater treatment system 400 according to the fourth embodiment will be described. 5 is a schematic diagram of a wastewater treatment system 400 according to a fourth embodiment. As shown in FIG. 5, in the wastewater treatment system 400 which concerns on 4th embodiment, since the holding tank 10 is equipped with the 1st partition plate 51, the wastewater treatment system which concerns on 3rd embodiment The configuration is different from 300.

The 1st partition plate 51 is a plate-shaped member which partitions the inside of the holding tank 10, and is located in the inside of the holding tank 10. As shown in FIG. In FIG. 5, the first partition plate 51 extends from the side wall portion just in front of the ground of the tank body 11 to the side wall portion in the ground, and the lower end of the first partition plate 51 is the tank body. It is located above the bottom of 11, and the upper end of the 1st partition plate 51 is located below the ceiling of the tank main body 11. As shown in FIG. That is, the lower end of the 1st partition plate 51 and the bottom part of the tank main body 11 are separated, and the upper end of the 1st partition plate 51 and the ceiling part of the tank main body 11 are separated.

Moreover, the inflow area 61 in which the inflow port 14 was provided is partitioned by the 1st partition plate 51 and the tank main body 11, and the outflow area 62 in which the outflow port 15 was provided is provided. It is partitioned. In addition, in this embodiment, the air port 16 is provided in the inflow area 61. As shown in FIG.

In addition, as mentioned above, since the lower end of the 1st partition plate 51 and the bottom part of the tank main body 11 are separated, the upper end of the 1st partition plate 51 and the ceiling part of the tank main body 11 are separated, The inflow area 61 and the outflow area 62 communicate with each other. Therefore, the cleaning liquid can flow between the inflow area 61 and the outflow area 62 between the lower end of the 1st partition plate 51 and the bottom part of the tank main body 11. In addition, air can flow between the inflow area 61 and the outflow area 62 between the upper end of the 1st partition plate 51 and the ceiling part of the tank main body 11.

Furthermore, in this embodiment, the floating member 12 is provided only in the outflow area 62, and the floating member 12 and the outflow area 62 match in the horizontal cross section, and the thickness of the floating member 12 is It has a thickness dimension that cannot be tilted in the tank main body 11. Thereby, the internal flow of the washing | cleaning liquid of the outflow area 62 is suppressed, and the quantity of the contaminant particle contained in the washing | cleaning liquid supplied to the wastewater treatment part 20 can be suppressed.

In addition, in this embodiment, the washing | cleaning liquid which flowed in inflow port 14 is made to reduce pressure and degassing in inflow area 61. As a result, the generation of the dissolved gas and the expansion of the bubbles due to the decompression of the cleaning liquid occur in the inflow region 61, and in the outflow region 62, no base layer is formed between the floating member 12 and the cleaning liquid. . As a result, the effect of suppressing the internal flow of the cleaning liquid by the floating member 12 is not impeded. In other words, the wastewater treatment system 300 according to the third embodiment includes the shear tank 40 (see FIG. 4), whereas the wastewater treatment system 400 according to the present embodiment includes the shear tank 40. Can be omitted.

 (5th Embodiment)

Next, a wastewater treatment system 500 according to a fifth embodiment will be described. 6 is a schematic diagram of a wastewater treatment system 500 according to a fifth embodiment. As shown in FIG. 6, in the wastewater treatment system 500 according to the fifth embodiment, the wastewater treatment system 100 according to the first embodiment has a plurality of second partition plates 52. The configuration is different.

The 2nd partition plate 52 is a plate-shaped member which partitions the inside of the holding tank 10, and is located in the inside of the holding tank 10. As shown in FIG. In FIG. 6, the second partition plate 52 extends from the side wall portion just in front of the ground of the tank body 11 to the side wall portion in the ground. Although the lower end of the 2nd partition plate 52 is in contact with the bottom part of the tank main body 11, the distribution hole 53 is formed in the lower part. In addition, an upper end of the second partition plate 52 is located below the ceiling of the tank body 11.

The inflow area 61 provided with the inflow port 14 is partitioned by the said 2nd partition plate 52 and the tank main body 11, and the outflow area 62 provided with the outflow port 15 is partitioned. . Furthermore, each intermediate region 63 is partitioned by two second partition plates 52 adjacent to each other. In the present embodiment, the air port 16 is provided in the inflow area 61.

Furthermore, between the inflow area 61 and the intermediate area 63, between each intermediate area 63, and between the intermediate area 63 and the outflow area 62, a flow hole 53 formed in the second partition plate 52. Cleaning fluid can be distributed through). In addition, between the inflow region 61 and the intermediate region 63, between each intermediate region 63, and between the intermediate region 63 and the outflow region 62, the upper end of the second partition plate 52 and the tank body ( 11) Air can be distributed between the ceilings.

Furthermore, the floating member 12 is located in the outflow area 62, and the suction pipe 13 is attached to this floating member 12. In addition, the washing liquid introduced from the inlet 14 is decompressed and degassed in the inlet region 61.

As described above, according to the wastewater treatment system 500 according to the present embodiment, since the inside of the holding tank 10 is partitioned into a plurality of small areas, even if the vessel 101 is swung, the inside of the holding tank 10 may be reduced. The internal flow of the cleaning liquid can be suppressed. As a result, contaminant particles separated from the cleaning liquid can be suppressed from being dispersed again into the cleaning liquid.

 (Other variations)

As mentioned above, although the wastewater treatment system 100,200,300,400,500 and the ship 101 which concern on embodiment were demonstrated, the wastewater treatment apparatus and ship which concern on this invention are not limited to said structure. For example, although the case where the holding tank 10 is located in the bottom of the ship 101 was demonstrated, the holding tank 10 may be provided in the steering chamber 104, and the deck 105 (FIG. 1). Reference).

Here, since the steering gear chamber 104 located above the key 106 cannot secure enough space, it becomes a dead space in many cases. Therefore, when the holding tank 10 is provided in the steering chamber 104, the dead space can be effectively used. In addition, when the holding tank 10 is installed in the deck 105, the operation of discharging the contaminated particles (sludge) collected in the holding tank 10 can be performed relatively easily.

In addition, in the above-mentioned embodiment, although the scrubber 117 which comprises a part of EGR unit 115 is comprised by the single body, the scrubber 117 is integrated with the EGR gas cooler 118 etc., for example. It may be formed as.

Furthermore, in the above-described embodiment, the exhaust gas cleaned by the scrubber 117 is an EGR gas, but the exhaust gas cleaned by the scrubber 117 is the exhaust gas discharged from the engine system 110, that is, the supercharger in the example of FIG. 1. The exhaust gas which passes through 114 and is discharged from the ship may be used.

10: hold tank
11: tank body
12: floating member
13: suction line
14: inlet
15: outlet
17: inlet
20: wastewater treatment unit
51: first partition plate
52: second partition plate
61: inflow zone
62: outlet area
63: middle region
100, 200, 300, 400, 500: wastewater treatment system
101: ship
102: hull
104: steering wheel
105: Deck
110: engine system
111: engine
117: scrubber

Claims (15)

A wastewater treatment system for purifying cleaning liquid discharged from a scrubber,
A holding tank having a tank body for temporarily holding a washing liquid discharged from the scrubber;
A wastewater treatment unit for purifying the cleaning liquid supplied from the holding tank;
The discharge per unit time of the cleaning liquid discharged from the scrubber is the maximum discharge in a predetermined period,
A wastewater treatment system, wherein the supply amount per unit time of the cleaning liquid supplied from the holding tank to the wastewater treatment unit is controlled to be less than the maximum discharge amount of the scrubber over all periods.
The method of claim 1,
By temporarily holding the cleaning liquid, the holding tank preferentially selects a cleaning liquid corresponding to a portion having a low concentration of contaminated particles, among a portion having a high concentration of contaminating particles and a portion having a low concentration of contaminating particles, generated in the cleaning liquid. And a wastewater treatment system, configured to supply the wastewater treatment unit.
The method of claim 2,
The tank main body has an outlet through which the cleaning liquid supplied to the wastewater treatment unit flows out,
The said outlet is a wastewater treatment system located in the lower part of the said tank main body.
The method of claim 2,
The holding tank is
A floating member floating on the liquid level of the cleaning liquid held by the tank body;
It has a suction port which injects the washing | cleaning liquid which the said tank main body holds, and the suction pipe which supplies the washing | cleaning liquid suctioned at the said suction opening to the said wastewater treatment part,
And the suction pipe is mounted to the floating member, and the suction port is displaced according to the displacement of the floating member.
The method of claim 4, wherein
And the suction port is located at a position corresponding to the bottom surface of the floating member.
The method of claim 4, wherein
And the suction port is located at a position away from the floating member by a predetermined distance.
The method according to any one of claims 4 to 6,
The said floating member is a plate-shaped member which covers the liquid surface of the washing | cleaning liquid which the said tank main body holds, and is comprised so that the angle with respect to the said tank main body may be maintained.
The method of claim 7, wherein
The holding tank is
Having a first partition plate for partitioning the inside of the tank body,
The first partition plate partitions an inflow region provided with an inflow port through which the cleaning liquid discharged from the scrubber flows in, and an outflow region provided with an outlet port through which the cleaning liquid supplied to the wastewater treatment unit flows out,
The cleaning liquid can be flowed between the inflow region and the outflow region,
The flotation member is installed in the outflow area.
The method according to any one of claims 1 to 6,
The said holding tank partitions the inside of the said tank main body, and has a some 2nd partition plate which partitions each area | region, The wastewater treatment system in which the washing | cleaning liquid can flow between each said area | region.
Ship having a wastewater treatment system according to any one of claims 1 to 9.
The method of claim 10,
A part of said tank body is comprised by a part of hull.
The method of claim 11,
The holding tank is located at the bottom of the ship.
The method of claim 10,
The holding tank is a ship, which is provided in the steering wheel or in the deck.
The method according to any one of claims 10 to 13,
The exhaust gas cleaned by the scrubber is an EGR gas refluxed to the engine,
The said predetermined period during which the discharge | emission per unit time of the cleaning liquid discharged | emitted from the said scrubber becomes maximum discharge | emission is a period in which EGR rate becomes more than a predetermined value.
The method of claim 14,
And controlling the EGR rate to be equal to or greater than a predetermined value when the ship navigates in the ECA.

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