Centrifugal solid-liquid separation device and water treatment device using same

Abstract

When a plurality of cyclones are used as a separation device of a water treatment device, there have been as many lower liquid containers as the number of cyclones, resulting in high cost. Provided is a centrifugal solid-liquid separation device including: a plurality of cyclones respectively having at least a liquid inlet, a liquid outlet, and a lower liquid port; and a lower liquid container communicating with the respective lower liquid ports of the plurality of cyclones via pipes, arranged below the plurality of cyclones, and having a drain hole in its bottom side. The lower liquid container includes a space forming portion above lower opening ends of the pipes. Also provided is a water treatment device using this centrifugal solid-liquid separation device.

Claims

1. A centrifugal solid-liquid separation device comprising: a plurality of cyclones, each cyclone of the plurality of cyclones having at least a liquid inlet, a liquid outlet, and a lower liquid port; and a lower liquid container that communicates with the lower liquid ports of each of the plurality of cyclones, wherein the lower liquid container is provided with an air space above communication opening ends of the respective lower liquid ports of the plurality of cyclones, a liquid level in the lower liquid container extending to the communication opening ends, and the air space extending from the communication opening ends to a top portion of the lower liquid container.

2. The centrifugal solid-liquid separation device according to claim 1, wherein the communication opening ends comprise the respective lower liquid ports.

3. The centrifugal solid-liquid separation device according to claim 1, wherein the lower liquid container has a drain hole, and the centrifugal solid-liquid separation device further comprises: a communication member, one end of the communication member is connected to the drain hole; and a storage container, the other end of the communication member is connected to the storage container.

4. A water treatment device comprising: a water intake pipe connected to a water intake port; an inactivation device with a water inlet connected to the water intake pipe; a pipe connected to a water outlet of the inactivation device and divided into a plurality of pipes; and the centrifugal solid-liquid separation device according to claim 3, in which each liquid inlet is connected with one of the plurality of pipes.

5. A water treatment device comprising: a water intake pipe connected to a water intake port; the centrifugal solid-liquid separation device according to claim 1, in which each liquid inlet is connected to the water intake pipe; and an inactivation device with a water inlet connected to the liquid outlets of the plurality of cyclones of the centrifugal solid-liquid separation device.

6. A water treatment device comprising: a water intake pipe that is connected to a water intake port; a first centrifugal solid-liquid separation device according to claim 1, in which each liquid inlet is connected to the water intake pipe; an inactivation device with a water inlet connected to the liquid outlets of the plurality of cyclones of the first centrifugal solid-liquid separation device; and a second centrifugal solid-liquid separation device comprising: a plurality of cyclones, each cyclone of the plurality of cyclones of the second centrifugal solid-liquid separation device having at least a liquid inlet, a liquid outlet, and a lower liquid port; and a lower liquid container that communicates with the lower liquid ports of each of the plurality of cyclones of the second centrifugal solid-liquid separation device, wherein the lower liquid container is provided with an air space above communication opening ends of the respective lower liquid ports of the plurality of cyclones of the second centrifugal solid-liquid separation device, a liquid level in the lower liquid container extending to the communication opening ends, and the air space extending from the communication opening ends to a top portion of the lower liquid container, and wherein the lower liquid container has a drain hole, and the second centrifugal solid-liquid separation device further comprises: a communication member, one end of the communication member is connected to the drain hole; and a storage container, the other end of the communication member is connected to the storage container, wherein each liquid inlet of the plurality of cyclones of the second centrifugal solid-liquid separation device is connected to the water outlet of the inactivation device.

7. The water treatment device according to claim 4, wherein the inactivation device comprises, between the water inlet and the water outlet: opposed electrodes; and a power supply that applies a voltage between the opposed electrodes to pass an electric current between the opposed electrodes.

8. The water treatment device according to claim 5, wherein the inactivation device comprises, between the water inlet and the water outlet: opposed electrodes; and a power supply that applies a voltage between the opposed electrodes to pass an electric current between the opposed electrodes.

9. The water treatment device according to claim 6, wherein the inactivation device comprises, between the water inlet and the water outlet: opposed electrodes; and a power supply that applies a voltage between the opposed electrodes to pass an electric current between the opposed electrodes.

Description

BRIEF DESCRIPTION OF DRAWINGS

(1) FIG. 1 is a diagram showing a configuration of a water treatment device according to the present invention;

(2) FIG. 2 is a diagram showing in (a) and (b) only cyclones and a lower liquid container;

(3) FIG. 3 is a diagram showing another embodiment of the present invention; FIG. 4 is a diagram showing another relationship between the cyclones and the lower liquid container;

(4) FIG. 5 is a diagram showing an embodiment in which the cyclones and an inactivation device are combined in different order;

(5) FIG. 6 is a diagram showing an embodiment in which additional cyclones are provided after the cyclones and the inactivation device in the treatment process;

(6) FIG. 7 is a diagram showing a configuration of a conventional example of a water treatment device; and

(7) FIG. 8 is a diagram showing a configuration of a more detailed conventional example of the water treatment device.

DESCRIPTION OF EMBODIMENTS

(8) A centrifugal solid-liquid separation device according to the present invention and a water treatment device using the same will be described below with reference to the drawings. The following embodiments are mere exemplary embodiments of the present invention, and the present invention is not limited to the following description. Modifications may be made to the following embodiments without departing from the gist of the present invention. As employed herein, liquid to be treated includes seawater, fresh water, and a mixture of seawater and fresh water. The liquid to be treated may contain aquatic organisms and the like. A liquid obtained in a last treatment process by the water treatment device according to the present invention will be referred to as a treated liquid. The treated liquid is the liquid to be treated on which a treatment for killing aquatic organisms has been performed and a treatment for separating aquatic organisms and the like has been performed.

(9) (Embodiment 1)

(10) FIG. 1 shows a configuration of a water treatment device 1 according to the present embodiment. The water treatment device 1 includes an inactivation device 10 and a centrifugal solid-liquid separation device 20. A water inlet 12a of a main body 12 of the inactivation device 10 is connected to a water intake pipe 11a extending from a water intake port 11 of the hull. A water intake pump 11b is arranged in the water intake pipe 11a. A pipe 13 is connected to a water outlet 12b of the main body 12.

(11) The centrifugal solid-liquid separation device 20 includes a plurality of cyclones 21 and 22 and a lower liquid container 24. The centrifugal solid-liquid separation device 20 may also include a valve 25 arranged under the lower liquid container 24, a storage container 26, a flushing pump 27, and a drain pipe 28. The number of cyclones is not limited in particular as long as it is two or more. A case with two cyclones will be described here. A process of separating aquatic organisms and the like from the liquid to be treated by the centrifugal solid-liquid separation device 20 will be referred to as separation treatment.

(12) As the inactivation device 10, a kind of a device capable of applying a voltage between opposed electrodes 14a and 14b with a power supply 14v is arranged. Unlike the case of using a disinfectant, this reduces time and labor for maintenance. The inactivation device 10 itself can also be reduced in size. The pipe 13 connected to the water outlet 12b of the inactivation device 10 branches off on the way toward liquid inlets 21a and 22a of the cyclones 21 and 22 of the centrifugal solid-liquid separation device 20. A process of killing aquatic organisms and the like by the inactivation device 10 will be referred to as killing treatment.

(13) Lower liquid ports 21c and 22c of the cyclones 21 and 22 communicate with the lower liquid container 24 via pipes 21d and 22d. No valve is arranged in the pipes 21d and 22d. Liquid outlets 21b and 22b of the cyclones 21 and 22 are respectively connected with pipes 21e and 22e at one end thereof. The other ends of the pipes 21e and 22e are connected to a treated liquid storage tank 30. The treated liquid storage tank 30 may be a ballast tank or other equipment.

(14) The lower liquid container 24 has a drain hole 24e on its drain side. An openable and closable air vent 24r may be arranged in an upper part. Communication open ends 21do and 22do of the pipes 21d and 22d in the lower liquid container 24 are located below a ceiling 24t of the lower liquid container 24.

(15) One of features in the centrifugal solid-liquid separation device 20 according to the present embodiment is that an air space 24s is secured in the lower liquid container 24 common to the plurality of cyclones 21 and 22 from the ceiling 24t of the lower liquid container 24 down to the communication opening ends 21do and 22do of the pipes 21d and 22d.

(16) The drain hole 24e is connected with a communication member 24p. The communication member 24p is connected to the storage container 26. The communication member 24p is provided with the valve 25.

(17) The storage container 26 takes in aquatic organisms and the like precipitated in the lower liquid container 24 to discharge the same. A pipe-like container can be suitably used when the aquatic organisms and the like are to be discharged by flushing water. The shape of the storage container 26 is not limited in particular as long as the precipitated aquatic organisms and the like can be stored. The storage container 26A may be provided with a neutralization device 29.

(18) When the inactivation device 10 is the kind of the device using the opposed electrodes 14a and 14b, the liquid to be treated after passing through the inactivation device 10 contains hypochlorous acid. The neutralization device 29 is provided to neutralize the hypochlorous acid before the liquid to be treated in the storage container 26 is discharged. Specifically, a device for injecting sodium thiosulfate into the storage container 26 can be suitably used.

(19) The flushing pump 27 may be connected to the storage container 26 in the upstream side. The purpose is to discharge the liquid to be treated in the storage container 26 by flushing water. The drain pipe 28 is connected to the storage container 26 in the downstream side. A downstream end 28b of the drain pipe 28 is a drain port open to outside the ship.

(20) Next, an operation of the water treatment device 1 according to the present embodiment will be described. Here, a description will be given by taking a case in which the water treatment device 1 stores the treated liquid in the treated liquid storage tank 30 for example. When the treated liquid is stored in the treated liquid storage tank 30, the liquid to be treated is taken in through the water intake port 11 formed in the outer surface of the hull via the water intake pump 11b. The liquid to be treated taken in is passed through the water intake pipe 11a to enter the inactivation device 10. The valve 25 of the communication member 24p connected to the drain hole 24e of the lower liquid container 24 is closed. The air vent 24r may usually be closed.

(21) In the inactivation device 10, a voltage is applied between the opposed electrodes 14a and 14b to pass an electric current. The liquid to be treated is electrolyzed between the opposed electrodes 14a and 14b. Accordingly, the anode generates chlorine gas, which is dissolved to produce hypochlorous acid. The organisms can be killed with the hypochlorous acid.

(22) The liquid to be treated coming out of the water outlet 12b of the inactivation device 10 is passed through the pipe 13 and injected into the cyclones 21 and 22 through the liquid inlets 21a and 22a.

(23) The lower liquid ports 21c and 22c of the cyclones 21 and 22 directly communicate with the lower liquid container 24. The liquid to be treated thus falls into the lower liquid container 24. After the water level L of the lower liquid container 24 rises and the water level L reaches the communication opening ends 21do and 22do of the pipes 21d and 22d of the cyclones 21 and 22, the water level L does not rise any further. That is, the interior of the lower liquid container 24 is divided into a space for the liquid to treated up to the communication opening ends 21do and 22do and the air space 24s from the communication opening ends 21do and 22do to the ceiling 24t.

(24) The liquid to be treated flows continuously into the cyclones 21 and 22 through the liquid inlets 21a and 22a, and The cyclones 21 and 22 are thus filled with the liquid to be treated which is discharged through the liquid outlets 21b and 22b as a treated liquid. At this time, the liquid to be treated swirls along the inclined inner surfaces 21i and 22i in the cyclones 21 and 22. The aquatic organisms and the like having such specific gravities as to be pressed against the inclined inner surfaces 21i and 22i by the centrifugal force of swirl move downward while swirling along the inner surfaces 21i and 22i, pass through the lower liquid ports 21c and 22c and the pipes 21d and 22d, and fall into the lower liquid container 24. Capability of the cyclones 21 and 22 for separation with respect to magnitude of the specific gravity may be referred to as the sizing characteristics of the cyclones.

(25) The aquatic organisms and the like may include organisms and bacteria to be regulated by the Ballast Water Convention, and may include dead bodies thereof.

(26) The treated liquid itself is discharged out of the cyclones 21 and 22 through the liquid outlets 21b and 22b and stored in the treated liquid storage tank 30.

(27) FIG. 2(a) shows only the cyclones 21 and 22 and the lower liquid container 24. Suppose that there is a difference in pressure between the lower liquid ports 21c and 22c of the cyclones 21 and 22, and that pressure P22 at the lower liquid port 22c is higher than pressure P21 at the lower liquid port 21c. Then, the water level L in the lower liquid container 24 is raised. In FIG. 2, the water level after being raised is represented by L1. In spite of the above, the liquid to be treated in the lower liquid container 24 does not flow back into the cyclone 21. The reason is that the air space 24s in the lower liquid container 24 decreases in volume to absorb the increase of the pressure P22 at the lower liquid port 22c.

(28) In contrast, suppose that as shown in FIG. 2(b), the entire lower liquid container 24 is filled with the liquid to be treated without the air space 24s. FIG. 2(b) shows that the water level L has been raised to the ceiling 24t. Such a situation can occur when the communication opening ends 21do and 22do of the pipes 21d and 22d from the cyclones 21 and 22 are flush with the surface of the ceiling 24t (see FIG. 1) of the lower liquid container 24. In such a case, the liquid to be treated in the lower liquid container 24 flows back into the cyclone 21 when the pressure P22 at the lower liquid port 22c of the cyclone 22 is higher than the pressure P21 at the lower liquid port 21c of the cyclone 21.

(29) When the cyclones 21 and 22 are used as separation means, backflow through the lower liquid port 21c or the lower liquid port 22c means that the liquid to be treated flowing in through the liquid inlets 21a and 22a is simply discharged through the liquid outlet 21b or 22b as a treated liquid. In other words, the liquid to be treated from which aquatic organisms and the like are not separated (not having undergone separation treatment) is conveyed to the treated liquid storage tank 30 as a treated liquid.

(30) The liquid to be treated flowing into the cyclones 21 and 22 has passed through the inactivation device 10, and most of the aquatic organisms and the like are considered to be dead. However, aquatic organisms and the like as large as can be visually observed may be surviving. Consequently, if the liquid to be treated not having undergone separation treatment is stored in the treated liquid storage tank 30 as a treated liquid, the aquatic organisms may proliferate in the treated liquid storage tank 30 while the liquid to be treated is transported as ballast water. Discharging such liquid at the next port of call can cause environment pollution.

(31) In contrast, the air space 24s in the lower liquid container 24 shown in FIGS. 1 and 2(a) prevents the backflow into the cyclones 21 and 22 due to a difference in pressure between the lower liquid ports 21c and 22c of the cyclones 21 and 22. In other words, when the lower liquid container 24 is commonly used for the plurality of cyclones 21 and 22, to secure the air space 24s in the lower liquid container 24 enables an anti-backflow function to prevent the backflow into the cyclones 21 and 22.

(32) The aquatic organisms and the like stored in the lower liquid container 24 are discharged through the drain hole 24e under the lower liquid container 24 to the storage container 26 at regular intervals. Discharge above is performed by opening the valve 25 arranged on the communication member 24p. When the valve 25 is opened, the aquatic organisms and the like in the lower liquid container 24 are discharged into the storage container 26. After the contents of the lower liquid container 24 are discharged, the valve 25 is closed.

(33) After the valve 25 is closed, the flushing pump 27 upstream of the storage container 26 is operated. The flushing pump 27 pumps up the liquid to be treated outside the ship and passes the liquid as flushing water through the storage container 26 toward a downstream direction at high pressure. As a result, the aquatic organisms and the like in the storage container 26 are discharged through the drain pipe 28 to outside the ship through the downstream end 28b. The flushing pump 27 may be omitted since the aquatic organisms and the like in the storage container 26 can be discharged out of the ship without using the flushing pump 27.

(34) Installation of the storage container 26 enables the effect that the hypochlorous acid generated in the inactivation device 10 can be neutralized and the aquatic organisms and the like can be collected and returned to the water. Before discharge of contents of the storage container 26, a neutralizing agent can be applied from the neutralization device 29 to neutralize the hypochlorous acid. Although not shown in the diagrams, the neutralization device 29 and the like may also be provided a after the treated liquid storage tank 30 in a treatment process.

(35) FIG. 3 shows another embodiment of the centrifugal solid-liquid separation device 20 according to the present embodiment. The communication opening ends 21do and 22do of the pipes 21d and 22d in the lower tank container 24 are arranged to be flush with the ceiling 24t in the lower liquid container 24. However, the lower liquid container 24 is provided with space forming portions 24x on positions other than those where the pipes 21d and 22d are connected and in areas higher than the communication opening ends 21do and 22do.

(36) As shown in FIG. 3, when the liquid to be treated is stored in this lower liquid container 24, the liquid to be treated accumulates up to the ceiling 24t of the lower liquid container 24. However, the liquid to be treated will not accumulate further. The lower liquid container 24 thus can be configured to have an air space or air spaces 24s in the area higher than the communication opening ends 21do and 22do of the pipes 21d and 22d.

(37) Refer to FIG. 1 again. The space forming portions 24x shown in FIG. 3 can be formed with the communication opening ends 21do and 22do of the pipes 21d and 22d from the cyclones 21 and 22 and the lower liquid container 24, even when the lower liquid container 24 is not made in such a special shape as that of the lower liquid container 24 of FIG. 3.

(38) In other words, when the lower liquid container 24 is configured to be air-tight and the lower communication opening ends 21do and 22do of the pipes 21d and 22d are located below the ceiling 24t of the lower liquid container 24, the air space 24s from the ceiling 24t to the communication opening ends 21do and 22do can be deemed as a space forming portion 24x. That is, the lower liquid container 24 has a space forming portion or portions 24x in the area higher than the communication opening ends 21do and 22do of the pipes 21d and 22d from the cyclones 21 and 22.

(39) Communication between the lower liquid container 24 and the cyclones 21 and 22 does not necessarily require the pipes 21d and 22d. FIG. 4 shows a case in which the lower ports 21c and 22c of the cyclones 21 and 22 are directly provided in the lower liquid container 24. In such a case, the lower liquid ports 21c and 22c can be deemed as the communication opening ends 21do and 22do (see FIG. 3). As in FIG. 4, when the lower liquid ports 21c and 22c of the cyclones 21 and 22 serve as the communication opening ends 21do and 22do, height of the centrifugal solid-liquid separation device 20 can be suppressed as much as a length of the pipes 21d and 22d.

(40) As described above, despite the lower liquid container 24 common to the plurality of cyclones 21 and 22, the water treatment device 1 according to the present embodiment can prevent backflow of separated water into the respective cyclones, with a simple structure and a reduced number of components. In addition, since the storage container 26 is provided on the drain side of the lower liquid container 24, the hypochlorous acid generated in the inactivation device 10 can be neutralized for discharge.

(41) (Embodiment 2)

(42) FIG. 5 shows a configuration of a water treatment device 2 according to the present embodiment. A description of the same reference signs as those of embodiment 1 will be omitted. In the present embodiment, the water treatment device 2 includes a centrifugal solid-liquid separation device 20b and the inactivation device 10. Differences from Embodiment 1 lie in that the inactivation device 10 is arranged after the centrifugal solid-liquid separation device 20b in the treatment process, and that the centrifugal solid-liquid separation device 20b includes only the cyclones 21 and 22 and the lower liquid container 24 without the storage container 26.

(43) In the water treatment device 2 according to the present embodiment, relatively large aquatic organisms and the like in the liquid to be treated taken in through the water intake port 11 are initially separated before small aquatic organisms and the like are killed by the inactivation device 10. In such a case, the water drained from the centrifugal solid-liquid separation device 20b can be simply returned to the water without the addition of a neutralizing agent or the like, because nothing has been added to the liquid to be treated taken in.

(44) This further simplifies the members and saves a required space as compared to the case of Embodiment 1.

(45) As per FIG. 5, the water treatment device 2 includes the centrifugal solid-liquid separation device 20b and the inactivation device 10. The treated liquid storage tank 30 may also be included. The water intake pipe 11a is extended from the water intake port 11 formed in a surface of the hull. The water intake pipe 11a branches off and communicates with the liquid inlets 21a and 22a of the cyclones 21 and 22. The water intake pump 11b is arranged in the water intake pipe 11a.

(46) The lower liquid ports 21c and 22c of the cyclones 21 and 22 communicate with the lower liquid container 24. The drain hole 24e of the lower liquid container 24 is connected to the drain pipe 28. The downstream end 28b of the drain pipe 28 is a drain port.

(47) The liquid outlets 21b and 22b of the cyclones 21 and 22 communicate with the water inlet 12a of the inactivation device 10 via the pipes 21e and 22e. The water outlet 12b of the inactivation device 10 communicates with the treated liquid storage tank 30 via the pipe 13.

(48) Operation of the water treatment device 2 having the configuration will be described. The liquid to be treated is taken in through the water intake port 11 and conveyed to the cyclones 21 and 22. The cyclones 21 and 22 separate the aquatic organisms and the like depending on a predetermined specific gravity. More specifically, aquatic organisms and the like having the determined specific gravity or more fall into the lower liquid container 24. The liquid to be treated containing aquatic organisms and like having the determined specific gravity or less is conveyed from the liquid outlets 21b and 22b to the inactivation device 10.

(49) The aquatic organisms and the like in the lower liquid container 24 are returned through the drain port 28b to the water area. The aquatic organisms and the like to be returned to the water area at this time are ones existing in the liquid to be treated taken in from that place. The liquid to be treated to be returned to the water along with the aquatic organisms and the like has not passed through the inactivation device 10. Accordingly, even when the liquid is directly returned from the lower liquid container 24 to the water area, the environment not affected. Thus, both the storage container 26 and the neutralization device 29 can be omitted.

(50) In the inactivation device 10, the aquatic organisms and the like in the liquid to be treated are killed by hypochlorous acid generated between the opposed electrodes 14a and 14b. The liquid to be treated with the aquatic organisms and the like having been killed is stored in the treated liquid storage tank 30 as a treated liquid.

(51) As described above, the water treatment device 2 according to the present embodiment can be constituted only with the centrifugal solid-liquid separation device 20b having no storage container 26, the inactivation device 10 and the treated liquid storage tank 30. This allows a simpler configuration than that of the water treatment device 1 of Embodiment 1.

(52) (Embodiment 3)

(53) FIG. 6 shows a configuration of a water treatment device 3 according to the present embodiment. A description of the same reference signs as those of embodiment 1 will be omitted. In the present embodiment, the water treatment device 3 includes a centrifugal solid-liquid separation device 20b, the inactivation device 10, and a centrifugal solid-liquid separation device 40. Here, an initial centrifugal solid-liquid separation device 20b may be referred to as a first centrifugal solid-liquid separation device 20b, a next centrifugal solid-liquid separation device 40 maybe referred to as a second centrifugal solid-liquid separation device 40.

(54) The first centrifugal solid-liquid separation device 20b is the same as the centrifugal solid-liquid separation device 20b according to Embodiment 2. The second centrifugal solid-liquid separation device 40 is the same as the centrifugal solid-liquid separation device 20 according to Embodiment 1, but with different reference signs.

(55) The water treatment device 3 initially separates relatively large aquatic organisms and the like in the liquid to be treated taken in, kills aquatic organisms and the like in the inactivation device 10, and then further separates the aquatic organisms and the like. In the second centrifugal solid-liquid separation device 40, the hypochlorous acid generated by the inactivation device 10 is agitated in cyclones 41 and 42 to be diffused throughout the liquid to be treated so that the aquatic organisms and the like can be more reliably killed.

(56) A storage container 46 of the second centrifugal solid-liquid separation device 40 is provided with a neutralization device 49 to neutralize and discharge the hypochlorous acid generated by the inactivation device 10.

(57) A configuration as well as an operation of the water treatment device 3 will be described below. The liquid to be treated taken in through the water intake port 11 is passed through the water intake pipe 11a and put in the cyclones 21 and 22 of the first centrifugal solid-liquid separation device through the liquid inlets 21a and 22a. Aquatic organisms and the like having predetermined specific gravities are separated according to the sizing characteristics of the cyclones 21 and 22, and precipitate in the lower liquid container 24. The aquatic organisms and the like in the lower liquid container 24 are discharged through the drain port 28b via the drain pipe 28.

(58) Meanwhile, the liquid to be treated discharged through the liquid outlets 21b and 22b of the cyclones 21 and 22 is directed to the water inlet 12a of the inactivation device 10. The inactivation device 10 applies a voltage between the opposed electrodes 14a and 14b to pass an electric current and thereby generate hypochlorous acid. The liquid to be treated is passed through a space between the opposed electrodes 14a and 14b and exposed to the hypochlorous acid. Aquatic organisms and the like in the liquid to be treated are killed by the hypochlorous acid.

(59) The liquid to be treated discharged from the water outlet 12b of the inactivation device 10 is directed to liquid inlets 41a and 42a of the cyclones 41 and 42 of the second centrifugal solid-liquid separation device 40. The liquid to be treated is strongly agitated in the cyclones 41 and 42, and the aquatic organisms and the like in the liquid to be treated are more reliably exposed to the hypochlorous acid and killed.

(60) Aquatic organisms and the like (mostly dead bodies of the aquatic organisms and the like) separated again according to the sizing characteristics of the cyclones 41 and 42 fall into a lower liquid container 44. The aquatic organism and the like in the lower liquid container 44 are collected in the storage container 46. An air vent 44r may be used in collecting the aquatic organisms and the like in the storage container 46. The hypochlorous acid in the liquid to be treated is neutralized by the neutralization device 49 arranged on the storage container 46. The aquatic organisms and the like in the storage container 46 are discharged out of the ship through a drain port 48b along with the liquid to be treated. The flushing pump 47 may be used for discharge.

(61) The liquid to be treated discharged through the liquid outlets 41b and 42b of the cyclones 41 and 42 is conveyed to the treated liquid storage tank 30 as a treated liquid.

INDUSTRIAL APPLICABILITY

(62) The water treatment device according to the present invention can be suitably used in taking ballast water into the hull. The centrifugal solid-liquid separation device according to the present invention can be widely used as a means for separating the liquid phase.

REFERENCE SIGNS LIST

(63) 1, 2, 3 water treatment device

(64) 10 inactivation device

(65) 11 water intake port

(66) 11a water intake pipe

(67) 11b water intake pump

(68) 12 main body

(69) 12a water inlet

(70) 12b water outlet

(71) 13 pipe

(72) 14a, 14b opposed electrode

(73) 14v power supply

(74) 20 centrifugal solid-liquid separation device

(75) 40 second centrifugal solid-liquid separation device

(76) 20b (first) centrifugal solid-liquid separation device

(77) 21i, 22i inner surface

(78) 21c, 22c lower liquid port

(79) 21d, 22d pipe

(80) 21e, 22e pipe

(81) 21do, 22do communication opening end

(82) 21, 22 cyclone

(83) 21a, 22a liquid inlet

(84) 21b, 21b liquid outlet

(85) P21 pressure at the lower liquid port 21c

(86) P22 pressure at the lower liquid port 22c

(87) 24 lower liquid container

(88) 24e drain hole

(89) 24t ceiling

(90) 24s air space

(91) 24x space forming portion

(92) 24p communication member

(93) 24r air vent

(94) 25 valve

(95) 26 storage container

(96) 27 flushing pump

(97) 28 drain pipe

(98) 28b downstream end (drain port)

(99) 29 neutralization device

(100) 30 treated liquid storage tank

(101) 41, 42 cyclone

(102) 41a, 42a liquid inlet

(103) 41b, 42b liquid outlet

(104) 44 lower liquid container

(105) 44r air vent

(106) 46 storage container

(107) 47 flushing pump

(108) 49 neutralization device

(109) 48b drain port

(110) 100 water treatment device

(111) 101 seawater intake line

(112) 102 rough filtration device

(113) 103 pump

(114) 104 disinfectant supply device

(115) 105 retention tank

(116) 106 treated water conveyance line

(117) 107 ballast tank

(118) 200 centrifugal solid-liquid separation device

(119) 202, 204 cyclone

(120) 202a, 204a liquid inlet

(121) 202b, 204b liquid outlet

(122) 202c, 204c lower liquid port

(123) 202i inner surface

(124) 206, 208 lower liquid container

(125) 210, 212 valve

(126) 216 flushing pump

(127) 218 drain pipe

(128) 220 discharge port

(129) 240 treated liquid storage tank

(130) 214 storage container

(131) 230 inactivation device

(132) 232 water intake pump