WO2008038371A1

WO2008038371A1 - Water-treatment method and apparatus

Info

Publication number: WO2008038371A1
Application number: PCT/JP2006/319334
Authority: WO
Inventors: Toshio Ueda; Kyo Kunishio; Keizou Murakami; Hideki Iwamoto
Original assignee: Global Trust Incorporated
Priority date: 2006-09-28
Filing date: 2006-09-28
Publication date: 2008-04-03

Abstract

In a water-treatment system provided with an ozone generator, an ozone-treatment device, a filtration device and a reverse osmotic membrane, a device having a baffle plate at a definite position therein is employed as the ozone-treatment device. Seawater is flown into this ozone-treatment device to give a turbulent flow so that ozone diffuses throughout the seawater, thereby performing the ozone-treatment. After thus forming oxygen nanobubbles containing concentrated mineral ions around the flow, the seawater is passed through the filtration device and the reverse osmosis device. Then, the desalinated water is flown out from the water-treatment system. According to this method, fresh water containing a large amount of dissolved oxygen and being rich in minerals can be obtained from seawater.

Description

Specification

Water treatment method and apparatus

Technical field

[0001] The present invention relates to a water treatment method for desalinating seawater and a water treatment apparatus for carrying out the method.

Background art

[0002] Conventionally, it is known that if water to be treated is treated using ozone, contaminants such as organic substances contained in the water to be treated can be removed by the strong oxidation and sterilization action of ozone. . In this case, it is necessary to supply a large amount of high-concentration ozone gas to the water to be treated. However, because ozone is easily converted to oxygen immediately, or when applying the water to be treated, a high water pressure is applied. There is a problem that it is extremely difficult to supply a large amount of ozone gas into the water to be treated and to diffuse and mix it. Depending on the use of the water to be treated, it is usually required to treat a large amount of water to be treated in as short a time as possible. For this reason, there is a need for a water treatment method that satisfies such conditions, increases the amount of dissolved oxygen, and leaves useful components in the water to be treated.

For example, as seawater desalination treatment, as shown in FIG. 1, seawater that has been appropriately pretreated such as sterilization and disinfection is filtered through a high-pressure pump 1 and a reverse osmosis membrane (not shown). There is known a method in which the apparatus 2 provided with 2 is supplied into the apparatus 3. In this case, the water particles 4 containing minerals 4a and harmful substances 4b such as chlorine in seawater hardly pass through the reverse osmosis membrane 2, and only the water particles 5 and a part 6 of the mineral components pass through. These water particles 4 are composed of large water particles 4c and small water particles 4d together with minerals 4a and harmful substances 4b such as chlorine. In FIG. 1, 7 is a tank for concentrated salt water, 8 is a tank for storing treated water, and 9 is a container for chlorinated water for sterilizing and disinfecting water after treatment with a reverse osmosis membrane.

[0004] Further, in order to purify a large amount of water to be treated such as seawater, for example, an ozone supply device that mixes ozone gas into the water to be treated (for example, see Patent Document 1) and this device are used. A water treatment method (for example, see Patent Document 2) has been proposed. However, in this prior art, water treatment is performed using a specific ozone supply device provided with a magnetic treatment unit, and the solution in the treated water is dissolved. The purpose is to reduce the amount of oxygen present.

[0005] However, water with a high amount of dissolved oxygen has the advantage of providing vitality to the human body as well as living organisms living in the water and quickly recovering from fatigue. In addition, such water with a high amount of dissolved oxygen also has the merit of providing vitality to the soil and helping plant growth. However, a water treatment method for easily obtaining fresh water with a large amount of dissolved oxygen from seawater has not been known so far.

[0006] Furthermore, as a method for generating nanobubbles, it has been proposed to decompose and gasify a part of water by electrolysis or to generate nanobubbles by applying ultrasonic waves in water (for example, And Patent Document 3). However, it is difficult to efficiently process a large amount of seawater in a short time.

Patent Document 1: Japanese Patent Laid-Open No. 63-200891 (Claims etc.)

Patent Document 1: Japanese Patent Publication No. 3-72359 (Claims)

Patent Document 3: Japanese Patent Application Laid-Open No. 2003-334548 (Claims)

Disclosure of the invention

Problems to be solved by the invention

[0007] An object of the present invention is to solve the above-mentioned problems of the prior art, and a large amount of seawater is desalinated in a short time so that the amount of dissolved oxygen is large and the mineral components in seawater are large. An object is to provide a compact water treatment method and apparatus for obtaining remaining fresh water.

Means for solving the problem

[0008] If the water treatment method for obtaining fresh water having a large amount of dissolved oxygen from seawater and the water treatment apparatus therefor are developed, the present inventors can use the obtained fresh water in various industrial fields. Various studies have been repeated from the idea that it is meaningful. As a result, the inventors have realized that the purpose can be achieved by ozone treatment of seawater to form oxygen nanobubbles, and the present invention has been completed.

[0009] A first water treatment method of the present invention is a water treatment system comprising at least one ozone generator, at least one ozone treatment device, at least one filtration device, and a device comprising a reverse osmosis membrane. In the water treatment method for supplying seawater to desalination, the ozone treatment device is a cylindrical body having a cylindrical central portion and frustoconical end portions. Seawater is supplied from the truncated portion, and the ozone-treated seawater is discharged from the other truncated portion to the filtration device. In addition to supplying turbulent flow, ozone generated by the ozone generator is injected into the seawater. For example, ozone is introduced into the seawater from an upstream position inside the ozone treatment apparatus or from an upstream position outside the treatment apparatus. The ozone treatment is performed by injecting the ozone into the turbulent seawater and diffusing it throughout the ozone treatment equipment. After the oxygen bubbles generated from the injected ozone are nanobubbled, It is characterized by being passed through a filtration device and a reverse osmosis membrane to be desalinated and discharged outside the water treatment system.

[0010] The ozone treatment apparatus further includes at least one baffle plate at a predetermined position inside the ozone treatment apparatus, and the seawater supplied into the ozone treatment apparatus is further collided with the top plate and turbulent. It is characterized by ozone treatment, which is made to flow and diffuse as ozone is more rapidly involved in seawater.

[0011] The baffle plate is configured to have at least an upper surface configured in a slope shape from the upstream side to the downstream side, and to have a cross section that tapers from the upstream side to the downstream side. It is characterized by that. This baffle plate preferably has a tongue shape.

[0012] It is characterized in that it is passed through the reverse osmosis membrane to desalinate mainly by removing sodium salt and impurities in seawater.

[0013] In the seawater treated in the ozone treatment apparatus, nanobubbles in which mineral components in seawater are concentrated are generated around the produced oxygen nanobubbles, and the treated seawater is allowed to pass through a reverse osmosis membrane. In this case, the nanobubbles are passed through a reverse osmosis membrane together with water particles to increase the amount of dissolved oxygen in the treated seawater, and the mineral component remains in the treated water.

[0014] Seawater that has been treated with the reverse osmosis membrane and contains mainly sodium chloride and impurities that have not passed through the reverse osmosis membrane and that has an increased amount of dissolved oxygen is removed from the water treatment system as concentrated seawater. It is characterized by letting it flow out.

[0015] A second water treatment method of the present invention includes first and second ozone generation devices, first and second ozone treatment devices, first and second filtration devices, and a reverse osmosis membrane. In a water treatment method for supplying seawater to a water treatment system comprising an apparatus and desalinating the water, the first ozone As a treatment device, it is a cylindrical body consisting of a cylindrical central part and both ends of a frustoconical shape. Seawater is supplied from one of the truncated parts, and ozone-treated seawater is supplied from the other truncated part. A device that is configured to flow out to a first filtration device composed of an inorganic filtration device, and that further includes at least one screen plate at a predetermined position in the ozone treatment device is used. Seawater is supplied into the treatment device to make it turbulent, and ozone generated by the first ozone generator is injected into the seawater, for example, from the upstream position in the first ozone treatment device or the treatment device. Ozone is injected into seawater from the upstream position outside, and this ozone is entrained in turbulent seawater and diffused throughout the ozone treatment equipment, and ozone treatment is performed. Generated from the injected ozone Oxygen bubbling In the same way, the second ozone generator and the second ozone treatment device having the same configuration as the first ozone generation device and the first ozone treatment device are passed through the first filtration device. After the ozone treatment, it is passed through a second filtration device composed of an activated carbon filtration device, then passed through a reverse osmosis membrane, desalinated, and discharged out of the water treatment system. In this case, organic substances and inorganic substances in seawater are mainly removed by the first filtration apparatus, and remaining acidic and acidic substances and organic substances are mainly removed by adsorption by the second filtration apparatus.

[0016] In the second water treatment method, the baffle plate has at least an upper surface configured in a slope shape from the upstream side to the downstream side, and has a cross section that tapers from the upstream side to the downstream side. For example, having a mouth-like shape, passing through a reverse osmosis membrane to remove mainly sodium salt and impurities in seawater, and desalination, In the seawater treated in the first and second ozone treatment devices, nanobubbles are generated in which mineral components in seawater are concentrated around the produced oxygen nanobubbles, and the treated seawater is treated with a reverse osmosis membrane. When passing, the nanobubbles pass through the reverse osmosis membrane together with water particles to increase the amount of dissolved oxygen in the treated seawater, and to leave the mineral component in the treated water. The seawater containing mainly sodium chloride and impurities that have not passed through the reverse osmosis membrane and increased in the amount of dissolved oxygen is discharged out of the water treatment system as concentrated seawater. This is the same as the one water treatment method.

[0017] The water treatment device of the present invention includes an ozone generator, an ozone treatment device, a filtration device, and a reverse immersion. In addition to a water treatment device that desalinates seawater, which is a device force provided with a permeable membrane, the ozone treatment device is a cylindrical body having a cylindrical central portion and both end portions of a truncated cone shape, It is configured to supply seawater from one of the truncated portions, and to flow out the ozone-treated seawater from the other truncated portion to the filtration device, and a baffle plate at a predetermined position in the ozone treatment device. At least one apparatus, which is supplied into the ozone treatment apparatus, and in the ozone-treated seawater, mineral components in the seawater are concentrated around the oxygen nanobubbles! It is comprised so that it may be comprised. This baffle is as described above.

The invention's effect

[0018] According to the water treatment method of the present invention, a large amount of seawater can be desalinated in a short time to obtain fresh water having a large amount of dissolved oxygen and a large amount of mineral components in the seawater. Play.

BEST MODE FOR CARRYING OUT THE INVENTION

[0019] In the seawater to be treated in the present invention, various impurities, for example, insoluble substances such as dust and other suspended particles, microorganisms such as nocteria, colloidal substances, and dissolved substances are dissolved. Organic substances such as proteins and gases such as carbon dioxide are included as sex substances. If the seawater is desalinated and these impurities can be selected and removed as appropriate, water covering 70% of the surface of the earth, especially seawater, can be effectively used as drinking water, industrial water, agricultural water, etc.

[0020] According to the water treatment method of the present invention, seawater is first ozone-treated by passing through an ozone treatment apparatus. As described above, this ozone treatment apparatus is configured such that the central portion has a cylindrical shape, both end portions thereof have a truncated cone shape, and the diameter of the bottom surface of the cone shape is the same as the diameter of the cylinder. It is a cylindrical device. This truncation partial force seawater can be supplied, and the seawater treated from the other truncation part can be discharged to the next step. Since the bottoms of the truncated cone-shaped parts at both ends are connected to the cylindrical part, the seawater to be treated is supplied with a narrow inlet force at one of the truncated parts and processed through a cylindrical part wider than the inlet, Narrow outlet force at the other truncated part Flows to the next process. Seawater is the inner wall of the truncated cone at both ends in such an ozone treatment device. In the vicinity, a vortex is wound, creating a violent turbulent state. Therefore, when the ozone generated by the ozone generator is continuously injected into the ozone processor at a high concentration in a critical state, the ozone is immediately diffused throughout the ozone processor and the ozone treatment can be performed. In the process of converting the ozone diffused into the seawater into supersaturated oxygen, water molecules break down, so-called superoxide (HO) is a hydroxy free radical (OH

2

Lea radical) is generated. At this time, normal oxygen microbubbles are crushed into nanobubbles, and ions such as mineral components in seawater are concentrated and collected around the oxygen nanobubbles. In other words, the nanobubbles referred to in the present invention are ultrafine bubbles having a diameter of about 0.3 to 1. Onm, and ions such as mineral components in seawater are concentrated and gathered around these bubbles. Forms the outer shell of the bubble. This nanobubble is stable for a long time. This is thought to be due to the so-called salting-out phenomenon. In this case, the amount of dissolved oxygen in the treated seawater increases. The particle size of the nanobubbles can be measured using a known particle counter, for example, a particle counter described in JP-A-2003-334548.

[0021] By the way, ozone injected into the ozone treatment apparatus is composed of HO composed of superoxide-on (O— or •• —) according to the following chemical formula, and paraffin into which hydrogen atoms are incorporated.

2 2 2

It is thought to generate superoxide such as H 2 O and OH free radicals.

2 ^Λ

The

[0022] [Chemical 1]

0 3

丄

I 4 e

2 H ₂ 0

†

H ○ ₂ →→ HO

[0023] According to the present invention, as the ozone treatment apparatus, it is preferable to use an apparatus in which at least one baffle plate having a specific shape is arranged at a predetermined position. For example, the baffle plate has at least an upper surface configured in a slope shape from the upstream side to the downstream side with respect to the supplied seawater, and preferably has an upper surface and a lower surface configured in such a slope shape. Have That is, it is configured to have a cross section that tapers from the upstream side to the downstream side. For example, a baffle plate having a tongue shape is preferable. With this configuration, when seawater is flowed into the ozone treatment apparatus and the ozone supplied from the ozone generator is injected into the seawater, the ozone is violently diffused so as to be caught in the seawater. Can be performed efficiently. The ozone inlet may be provided as upstream as possible in the ozone treatment apparatus, and is preferably provided in the vicinity of the seawater supply port of the ozone treatment apparatus. Alternatively, it may be provided outside the ozone treatment apparatus and in the vicinity of the upstream side of the seawater supply port.

[0024] It is also preferable that the baffle plate is arranged in the vicinity of the seawater supply port of the ozone treatment apparatus, for example, by arranging a plurality of the above-mentioned bevel-shaped ones in a ring shape.

[0025] In the above case, as in the case of the vicinity of the inner wall of the frustoconical portion at both ends, the seawater flowing in the ozonizer is also present on the surface of the baffle plate, particularly on the vicinity of the sloped portion of It collides with a predetermined part of the baffle plate, becomes a violent turbulent state, and flows to the downstream side of the baffle plate in a whirling manner. When ozone is injected into seawater in such a state, ozone immediately diffuses in a turbulent state throughout the ozone treatment apparatus according to the flow of seawater. Forcibly, efficient ozone treatment can be performed. For this reason, in the process of converting ozone in seawater into supersaturated oxygen, the HO and OH gases that have the superoxide ion power described above are used.

2 Large amounts of free radicals are generated compared to the case without baffles. At this time, normal oxygen bubbles are crushed into nanobubbles, and ions such as mineral components in seawater are concentrated around the nanobubbles, and a large amount of such oxygen nanobubbles are generated. The amount of dissolved oxygen in the treated seawater increases.

[0026] By subjecting seawater to ozone treatment as described above, oxidative sterilization, decolorization, deodorization, and the like are performed. In this case, sterilization of nocteria and other microorganisms and degradation of proteins and other organic substances are also performed. In the water treatment system, it is preferable to arrange a plurality of such ozone treatment apparatuses and repeatedly purify seawater with ozone. Then, seawater is filtered in various filtration processes during a plurality of ozone treatment processes. In this case, it is preferable to use an inorganic filter or an activated carbon filter. Such a filtration device removes inorganic substances present in seawater, adsorbs and removes acidic and organic substances and reverse osmosis membranes disposed downstream of the water treatment system. It also plays a role of protection. After passing through this filtration step, the seawater may pass through, for example, an ultraviolet irradiation device to sterilize bacteria and decompose organic matter. At this stage, the treated seawater has already been desalinated at a high level. In the case of the present invention, there are no particular restrictions on the inorganic filter, but for example, a sand filter, a crusher filter, a ceramic filter, or a filter of any mixture of sand, sand, and ceramics can be used. Mention may be made of filtration devices.

[0027] According to the present invention, treated seawater that has been subjected to ozone treatment and filtration treatment is passed through an apparatus provided with a reverse osmosis membrane. In the case of a normal reverse osmosis membrane, almost no mineral components pass through, and chlorination of drinking water hardly causes any mineral components that have passed through to remain in the drinking water. However, in the reverse osmosis membrane treatment after the ozone treatment of the present invention, unlike the normal reverse osmosis membrane, the reverse osmosis membrane has a small diameter (about 0.3 to 1. Onm) as described above. Can be passed along with water particles, so the obtained fresh water becomes water with a lot of mineral components. The reverse osmosis membrane used in the present invention can pass oxygen nanobubbles because the membrane has an eye of about 1 to 2 nm. In addition, high-concentration ozone gas is injected into the ozone treatment device, and ozone is diffused and dispersed in a large amount in seawater for seawater treatment, resulting in an increase in the amount of dissolved oxygen in fresh water. In addition, salt and sodium components in seawater are treated with reverse osmosis membranes and can be discharged as high dissolved oxygen (for example, about 36. OmgZD concentrated seawater. From this concentrated saltwater, a known saltwater separation system can be used. The salt can be separated.

[0028] Hereinafter, an example of the water treatment method according to the present invention will be specifically described with reference to FIGS.

[0029] Referring to the water treatment system schematically shown in Fig. 2, the water treatment method of the present invention takes, for example, seawater 21 into a seawater tank 22 and ozone as described above. A large amount of ozone pumped into the treatment device 23 and injected into the ozone treatment device 24 is injected into the ozone treatment device, and the seawater is treated with ozone, and then various filtration devices 25 and reverse osmosis membranes (Fig. (Not shown) is used to filter impurities and discharge as sterile water.

[0030] In the ozone treatment device 23 at the front stage of the water treatment system, the high concentration generated in the ozone generator 24 The ozone gas is injected into the seawater, and as described above, the seawater is subjected to oxidative sterilization, decolorization, and deodorization treatment with ozone to achieve the desired effect. For example, after treatment with ultraviolet rays, treatment with a precision filter can be performed as desired to remove impurities of 1 μm or less in the treated water, or to kill bacteria produced when sterilized and decomposed with ultraviolet irradiation equipment. It is also possible to remove all or organic residue.

[0031] Next, with regard to the ozone treatment apparatus and baffle used in the present invention, refer to FIG. 3, FIG. 4 (a) and (b), and FIG. 5 (a) and (b) as embodiments thereof. To explain.

FIG. 3 shows an ozone treatment apparatus provided with a baffle plate. The ozone treatment device 31 is a cylindrical body composed of a cylindrical portion 31a and truncated cone portions 31b and 31c. One truncated cone portion 31b is connected to a seawater tank (not shown), The other truncated cone portion 31c is connected to a filtering device (not shown). The baffle plate 32 is provided at a predetermined position inside the ozone treatment device 31, and generates ozone so as to inject the ozone generated by the ozone generator 33 against a predetermined portion of the baffle plate. A device and a baffle are arranged. As a result, ozone diffuses efficiently in the turbulent flowing seawater. The ozone injection nozzle may be provided at a predetermined position of the cylindrical portion 31a on the upstream side. The ozone injection nozzle may be provided in the vicinity of the truncated portion of the truncated cone portion 31b as long as ozone is efficiently injected into seawater, or may be provided separately.

Next, a description will be given with reference to FIG. 4 showing an example of an ozone treatment apparatus provided with another baffle having a shape different from that in FIG. FIG. 4 (a) is a side cross-sectional view of an ozone treatment apparatus 41 composed of a cylindrical portion 41a and frustoconical portions 41b and 41c, and FIG. 4 (b) is a plan view thereof. The baffle plate 42 is configured in a bell shape, and the upper surface portion and the lower surface portion thereof are formed in a slope shape so that the tip portion 42a becomes V and becomes narrower.

[0034] It is preferable that the rear end portion 42b of the baffle plate 42 is formed in a slope shape so that seawater collides and becomes turbulent. This baffle plate 42 is fixed to the cylindrical portion 4 la of the ozone treatment device 41. Although there is no particular limitation on the fixing method, for example, as shown in FIG. 4, an ozone injection nozzle 43a of an ozone generator 43 may be used. That is, the baffle plate 42 can be fixed by opening the counter holes 42c and 42d and fitting the ozone injection nozzle 43a there. In FIG. 4, the ozone injection nozzle 43a is provided at a predetermined position of the cylindrical portion 41a and on the upstream side, but is provided in the vicinity of the truncated portion of the truncated cone portion 41b. It's okay. At least one ozone injection port 43b is provided at a portion of the ozone injection nozzle 43a that protrudes into the ozone treatment device 41. The inlet 43b may be a shower nozzle with an appropriate number of holes. Ozone is configured to be injected into seawater from this inlet 43b.

[0036] FIG. 4 shows an example in which one ozone inlet 43b is provided above and below the baffle plate 42. However, even if one inlet is provided at a predetermined position, three or more ozone inlets 43b are provided. It may be provided. In this case, an ozone generator may be provided depending on the number of inlets, or it may be branched from one ozone generator and connected to each inlet.

[0037] Sarako will be described with reference to FIG. 5 showing an example of an ozone treatment apparatus provided with a plurality of other baffles different in shape from FIG. FIG. 5 (a) is a side sectional view of an ozone generator 51 composed of a cylindrical portion 51a and truncated cone portions 51b and 51c, and FIG. 5 (b) is a plan view thereof. The baffle plates 52 are each configured in a velvet shape similar to FIG. In the figure, 52a is a front end portion 52a of the baffle plate 52, 52b is a rear end portion of the baffle plate, 53 is an ozone generator, and 54 is a fixing means for the baffle plate. In Fig. 5, the force for arranging 6 baffles is as appropriate as the number of baffles. Ozone is injected through an ozone injection nozzle of an ozone generator 53 provided near the entrance of the ozone treatment apparatus.

[0038] In the water treatment method of the present invention, the seawater taken into the seawater tank is treated in the ozone treatment apparatus described above, and then passed through various filtration devices. Next, the filtered treated water is supplied into a treatment device 62 provided with a reverse osmosis membrane 61 as shown in FIG. 6 for further treatment. In this case, ionized mineral components 63a and the like are present in a large amount around the oxygen nanobubbles 63 in the seawater treated by the ozone treatment apparatus. Therefore, when the treated seawater passes through the reverse osmosis membrane 61, the nanobubbles 63 in which the mineral component ions 63a are concentrated around and pass through the reverse osmosis membrane together with the water particles, into the treated water. A large amount of mineral components are present. Also, water particles in which mineral components 64a in seawater, harmful substances 64b such as chlorine, and sodium 64c gather together with water particles 64d. Since 64 is larger in size than the membrane, it does not permeate the reverse osmosis membrane and has a high dissolved oxygen content (approximately 36. OmgZD concentrated brine is discharged. In Fig. 6, 65 represents the treated water. The tank is a tank for concentrated salt water, and the salt water can be separated from the concentrated salt water by a known salt water separation system as described above.

[0039] The above phenomenon easily occurs because a reverse osmosis membrane having a membrane size of about 1 to 2 nm is used in the present invention. In the case of tap water, a cluster of water usually has 11 to 13 units as one unit, which itself passes through a reverse osmosis membrane. However, when such a cluster contains chlorine atoms, sodium atoms, and salt particles, the state of the state 0, the salt water is larger than that of the reverse osmosis membrane (greater than 2 nm). Therefore, it cannot pass. In the present invention, nano-sized bubbles (oxygen nano-bubbles generated by the acid of ozone) move in the sea water without being broken by metal ions that are minerals in the sea water. In this case, the mineral ions are attracted around oxygen, and the oxygen molecules are attracted by water molecules. The average size of this cluster is 1. Onm or less. Since it is smaller than the membrane used, most of it passes through the reverse osmosis membrane unlike salt water.

[0040] The oxygen nanobubbles obtained as described above exist in a stable state. This is because, as described above, ions such as minerals in seawater concentrate around the bubbles, creating an electrostatic repulsive force, making it difficult for the nanobubbles to disappear. The concentrated ions function as an outer shell that encloses the nanobubbles.

With reference to FIG. 7, an embodiment relating to the water treatment method of the present invention will be briefly described.

Seawater is taken into a seawater tank, treated in sequence by a treatment system consisting of an ozone treatment device, a filtration device and a reverse osmosis membrane having the above-mentioned structure connected to this tank, and then discharged to the treated water tank. . An ozone generator is connected to this ozone treatment device. Each of these components is connected by a pipe line. If desired, the seawater after being treated in each step can be returned to any component in the middle of the treatment system and reprocessed there. You may comprise so that components may be connected. Further, it is preferable that a pump is connected to an arbitrary pipe line, and an appropriate water pressure is applied to the entire treatment system so that the treated water flows uniformly. In the present invention, if two or more of these ozone treatment apparatuses are used, Zon treatment is effective.

The filtration device shown in FIG. 7 preferably uses a combination of the above-described inorganic filtration device and activated carbon filtration device. As the activated carbon filter, for example, coconut shell, coal, and petroleum filter means are used in appropriate combination. Remove inorganic and organic precipitates from seawater with an inorganic filter! ヽ Adsorb and remove oxidizing substances and organics with an activated carbon filter to facilitate reverse osmosis membrane treatment and supply a large amount of seawater. Even if it is processed, the components of the processing system are not clogged and the processing efficiency is not lowered. Further, an ultraviolet irradiation device (not shown) may be provided to decompose organic substances in seawater and sterilize bacteria.

[0043] By using a reverse osmosis membrane, salt (salt sodium salt) in seawater can be removed and a desalination treatment can be performed. This reverse osmosis membrane can use an appropriate number of multiple reverse osmosis membranes as a unit, and if the number of units is increased or decreased appropriately according to the amount of seawater treated, ヽ

FIG. 8 shows another embodiment relating to the water treatment method of the present invention. Seawater was taken into a seawater tank and equipped with a first ozone treatment device, a first filtration device, a second ozone treatment device, a second filtration device, and a reverse osmosis membrane having the above structure connected to the seawater tank. After being processed sequentially by the processing system that is the equipment power, it is discharged to the treated water tank. A first ozone generator is connected to the first ozone processor, and a second ozone generator is connected to the second ozone processor. Each of these components is connected by a pipeline, and as described above, seawater after being processed in each step can be returned to any component in the middle of the processing system and processed again as desired. Arbitrary components may be connected as described above. It is preferable to provide a pump as described above and apply an appropriate water pressure to the entire treatment system so that the treated water flows uniformly. Although two ozone treatment apparatuses have been described here, three or more ozone treatment apparatuses may be used.

[0045] The first filtration device is composed of an inorganic filtration device such as the above-mentioned sand filtration device, the second filtration device is composed of the above-mentioned activated carbon filtration device, and the role thereof is as described above. The reverse osmosis membrane has the function as described above. Dissolved oxygen is high (approx. 36. OmgZD concentrated seawater power is discharged from equipment equipped with reverse osmosis membranes. Salt can also be obtained from this concentrated brine by processing as described above. [0046] Next, the water treatment method of the present invention is carried out according to the water treatment system of Fig. 8, and the treated water obtained by treating seawater with 30 to 100 tonnes Z 曰, the seawater used for this treatment, The results of analyzing the amount of dissolved oxygen, mineral components, etc. will be described for tap water, treated water obtained by conventional water treatment, and commercially available mineral water (Ebian (registered trademark)).

[0047] Regarding the amount of dissolved oxygen, the oxygen concentration (PPm (mgZU)) of the sample was measured using a dissolved oxygen meter (DOL-40) manufactured by Electrochemical Measurement Co., Ltd.

[0048] The mineral component was measured according to a known inorganic ion analysis method.

[0049] Table 1 shows the measurement results regarding the amount of dissolved oxygen and the amount of mineral components.

(table 1)

(Ii) The ones marked with * in the treated water of the present invention are collected from: Seawater of Shigese, Koto-ku, Tokyo 4—〗 5, and others are collected from: Ariake-gun, Amakusa-gun, Kumamoto Prefecture Machikami 3S Ura 2 5 2 9-3 seawater>

[0050] From Table 1, it is clear that the amount of dissolved oxygen in the treated water obtained according to the water treatment method of the present invention is much higher than that of the conventional water treatment method. . Industrial applicability

[0051] According to the present invention, seawater desalination is industrially compacted by subjecting seawater to ozone treatment using a specific ozone treatment device and then passing it through a filtration device and a reverse osmosis membrane. Since it can be performed and fresh water having a high dissolved oxygen content and a high amount of mineral components can be obtained, the present invention is applicable to fields such as drinking water, industrial water, industrial water, and fish farming.

[0052] Concentrated salt water obtained as a by-product also has a high dissolved oxygen content and mineral content, and thus can be used in the fields of dried fish production, fish freshness maintenance, and aquaculture. Furthermore, since it can be separated as salt with a high mineral content using a known salt water separation system, it can also be applied to the salt industry.

Brief Description of Drawings

FIG. 1 is a schematic cross-sectional side view of an apparatus provided with a reverse osmosis membrane for explaining the action of a reverse osmosis membrane in the prior art.

FIG. 2 is a schematic configuration diagram for explaining a water treatment method according to the present invention.

FIG. 3 is a schematic side sectional view showing a structure of an embodiment of an ozone treatment apparatus used in the present invention.

[FIG. 4] A schematic side sectional view (a) and a plan view (b) showing the structure of another embodiment of an ozone treatment apparatus used in the present invention.

FIG. 5 is a schematic side sectional view (a) and a plan view (b) showing the structure of still another embodiment of the ozone treatment apparatus used in the present invention.

FIG. 6 is a schematic sectional side view of an apparatus provided with a reverse osmosis membrane for explaining the action of the reverse osmosis membrane in the present invention.

FIG. 7 is a block diagram of an embodiment of a water treatment method according to the present invention.

FIG. 8 is a block diagram of another embodiment of the water treatment method according to the present invention.

Explanation of symbols

[0054] 1 High-pressure pump 2 Reverse osmosis membrane

3 Ozone treatment equipment 4 Water particles

4a Mineral ingredients 4b Chlorine and other harmful substances

4c large water particles 4d small water particles

5 Water particles 6 Some mineral components

7 Tank for concentrated salt water 8 Tank for water after treatment

21 Seawater 22 Seawater tank Ozone treatment device 24 Ozone generator Filtration device 31 Ozone treatment device a Cylindrical part 31b ゝ 31c frustoconical part Baffle plate 33 Ozone generator, 51 Ozone treatment device 41a, 51a Cylindrical part b ゝ 41c, 51b ゝ 51c Conical part

52 baffle plate 42a, 52a baffle tip end b, 52b baffle plate rear end portion 42c, 42d stop hole, 53 ozone generator 54 fixing means

a Ozone injection nozzle 43b Ozone injection port

Reverse osmosis membrane 62 Ozone treatment device Nano bubble 63a Mineral component

b Water particles 64a Mineral component

b Hazardous substance 64c Sodium

d Water particles 65 Tank for water after treatment Concentrated salt water tank

Claims

The scope of the claims

[1] Water treatment for supplying seawater to a water treatment system comprising at least one ozone generator, at least one ozone treatment device, at least one filtration device, and a device equipped with a reverse osmosis membrane for desalination In the method, the ozone treatment device is a cylindrical body composed of a cylindrical central portion and both end portions of a truncated cone shape, supplying seawater from one truncated portion, and the other truncated partial force ozone Using a device configured to flow the treated seawater into the filtration device, the seawater is supplied into the ozone treatment device to create turbulence, and the ozone generated by the ozone generator is The ozone treatment is performed by injecting the ozone into the turbulent sea water and diffusing it throughout the ozone treatment equipment!オゾン, injected ozone force A water treatment method characterized in that the generated oxygen bubbles are nanobubbled and then passed through a filtration device and a reverse osmosis membrane to desalinate and flow out of the water treatment system.

[2] Using the ozone treatment device provided with at least one baffle plate at a predetermined position inside the ozone treatment device, the seawater supplied into the ozone treatment device is further caused to collide with the plate and the plate. The water treatment method according to claim 1, wherein the ozone treatment is performed by flowing and diffusing ozone in seawater.

[3] The baffle plate is configured to have at least an upper surface in which the upstream force is sloped toward the downstream side, and has a cross section that tapers from the upstream side to the downstream side. The water treatment method according to claim 2, wherein the water treatment method is performed.

[4] The water treatment method according to [2] or [3], wherein the baffle plate has a tongue shape.

[5] The water treatment method according to any one of [1] to [4], wherein the water is passed through the reverse osmosis membrane and desalinated by mainly removing sodium chloride and impurities in seawater.

[6] In the seawater treated in the ozone treatment apparatus, nanobubbles in which mineral components in seawater are concentrated are formed around the produced oxygen nanobubbles, and the treated seawater is passed through the reverse osmosis membrane. In this case, the nanobubbles are allowed to pass through a reverse osmosis membrane together with water particles to increase the amount of dissolved oxygen in the treated seawater, and the mineral component remains in the treated water. The water treatment method in any one of.

[7] Seawater that has been treated with the reverse osmosis membrane and contains mainly sodium chloride and impurities and has increased the amount of dissolved oxygen that has not passed through the reverse osmosis membrane and concentrated seawater outside the water treatment system The water treatment method according to claim 1, wherein the water treatment method is carried out.

[8] Supply seawater to a water treatment system comprising a first and second ozone generator, a first and second ozone treatment device, a first and second filtration device, and a device having a reverse osmosis membrane. In the water treatment method for desalination, the first ozone treatment device is a cylindrical body composed of a cylindrical central portion and both ends of a truncated cone shape, supplying seawater from one truncated portion, and The ozonated seawater from the other truncated portion is configured to flow out to the first filtration device comprising an inorganic filtration device, and at least one baffle plate is provided at a predetermined position in the ozone treatment device. First, seawater is supplied into the first ozone treatment device to make it turbulent, and the ozone generated by the first ozone generator is injected into the seawater. Like ozone Ozone treatment is performed by diffusing the entire device, and the injected ozone force is converted into nanobubbles, then passed through the first filtration device, and then the first ozone generator and the first ozone treatment device Using a second ozone generator and a second ozone treatment device having the same structure, after ozone treatment in the same manner, it is passed through a second filtration device comprising an activated carbon filtration device, and then passed through a reverse osmosis membrane for desalination. Water treatment method characterized by causing the water to flow out of the water treatment system.

[9] The baffle plate is configured to have at least an upper surface in which the upstream force is sloped toward the downstream side, and has a cross section that tapers from the upstream side to the downstream side. The water treatment method according to claim 8, wherein the water treatment method is performed.

[10] The water treatment method according to [8] or [9], wherein the baffle plate has a tongue shape.

[11] The water treatment method according to any one of [8] to [10], wherein the water is passed through the reverse osmosis membrane and desalinated by removing mainly sodium chloride salt and impurities in seawater.

[12] In the seawater treated in the first and second ozone treatment apparatuses, nanobubbles in which mineral components in the seawater are concentrated are produced around the produced oxygen nanobubbles. When passing through the reverse osmosis membrane, these nanobubbles together with water particles are reverse osmosis membrane The water treatment method according to any one of claims 8 to 11, wherein the dissolved oxygen amount in the treated seawater is increased, and the mineral component remains in the treated water.

[13] Seawater that has been treated with the reverse osmosis membrane and contains mainly sodium chloride and impurities and has increased the amount of dissolved oxygen that has not passed through the reverse osmosis membrane and concentrated water outside the water treatment system The water treatment method according to claim 8, wherein the water treatment method is carried out.

[14] In a water treatment apparatus for desalinating seawater comprising an ozone generator, an ozone treatment apparatus, a filtration apparatus, and a reverse osmosis membrane, the ozone treatment apparatus has a cylindrical central portion and a truncated cone shape. And is configured to supply seawater from one truncated portion and to discharge the ozone-treated seawater from the other truncated portion to a filtration device. A device having at least one baffle plate at a predetermined position in the ozone treatment device, wherein the mineral components in the seawater around the oxygen nanobubbles are supplied into the ozone treatment device and subjected to the ozone treatment. A water treatment apparatus characterized in that it is configured to generate concentrated nanobubbles.

[15] The baffle plate is configured to have at least a top surface configured in a slope shape toward the downstream side on the upstream side, and to have a cross section that tapers from the upstream side to the downstream side. 15. The water treatment apparatus according to claim 14, wherein

16. The water treatment device according to claim 14 or 15, wherein the baffle plate has a tongue shape.