JP2003285058A - Salt-containing water desalination system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a system capable of desalting salt-containing water without exerting a bad influence on the surrounding water area. <P>SOLUTION: The seawater desalination system 100 is composed of an intake pump 111 for taking in seawater 1, an insoluble material remover 120 for removing insoluble materials from the intake seawater 1, an desalination device 130 for obtaining clean water 3 and concentrated water 4 by the permeation of the seawater 1 through a reverse osmosis membrane (RO membrane) 132, a sewage treatment device 140 for purifying used sewage 5, and a concentrated water treatment device 150 for mixing the concentrated water 4 and purified water 6 from the sewage treatment device 140 to obtain adjusted water 8 having a salt concentration almost equal to that of the seawater 1. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a salt-containing water desalination system for desalination of salt-containing water, and particularly when applied to seawater desalination in a long-distance large passenger ship or a resort hotel on a remote island. It is valid.

[0002]

2. Description of the Related Art In large ships such as tanker ships and container ships that travel long distances, water used by passengers is stored in tanks, used sewage is purified and reused as clean water. ing. On the other hand, in a long-distance large passenger ship such as a luxury passenger ship on which passengers board, using sewage-purified water as drinking water may cause passengers to dislike it. It is equipped with a seawater desalination system that desalinates seawater for use as clean water.

[0003]

In the seawater desalination system as described above, concentrated salt water having a high salt concentration (about 1.5 to 2.5 times that of seawater) produced as a byproduct during seawater desalination is used. Must be discharged into the sea. However, if the concentrated water having a high salt concentration is returned as it is, the salt concentration in the surrounding sea area may change, which may cause an environmental problem.

Such a problem is not limited to a long-distance large cruise ship such as a luxury cruise ship on which passengers board, but for example,
This is the same as above when it is a place where it is difficult to secure clean water and the environmental conservation standards are strict, such as a resort hotel constructed on a remote island. Further, not only seawater but also water containing salt may cause the same problem as described above.

In view of the above, an object of the present invention is to provide a salt-containing water desalination system capable of desalinating salt-containing water without adversely affecting the surrounding water area.

[0006]

A salt-containing water desalination system according to the first aspect of the present invention for solving the above-mentioned problems comprises an intake means for taking salt-containing water, and the salt-containing water taken up. Desalination means for obtaining clean water and concentrated water by permeating the reverse osmosis membrane with a high-pressure pump, sewage treatment means for purifying used sewage, and adjustment of salt concentration approximately equal to the salt concentration of the salt-containing water. Concentrated water treatment means for mixing and adjusting the concentrated water and purified water from the sewage treatment means so as to obtain water is provided.

In the salt-containing water desalination system according to the second invention, in the first invention, the sewage treatment means is adjusted so that the value of the pollution factor of the sewage is substantially equal to that of the salt-containing water. It is characterized by doing.

The salt-containing water desalination system according to the third aspect of the present invention is the salt-containing water desalination system according to the first or second aspect, further comprising an insoluble matter removing means for removing insoluble matter from the salt-containing water that has been taken. The concentrated water treatment means mixes and adjusts the insoluble matter with the adjusted water so as to have a concentration substantially equal to the insoluble matter concentration of the salt-containing water.

The salt-containing water desalination system according to a fourth aspect of the present invention is the salt-containing water desalination system according to the third aspect, wherein the insoluble matter removing means incinerates the insoluble matter removed from the salt-containing water to reduce the volume. It is characterized in that it is provided with a capacity-imparting means.

A salt-containing water desalination system according to a fifth aspect of the invention is the salt-containing water desalination system according to any one of the first to fourth aspects, wherein at least a part of the purified water from the sewage treatment means is combined with the salt-containing water. It is characterized in that it is provided with a resending means for sending the desalination means to the high-pressure pump.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of a salt-containing water desalination system according to the present invention will be described with reference to the drawings, but the present invention is not limited to the following embodiments.

[First Embodiment] A first embodiment in which the salt-containing water desalination system according to the present invention is applied to a seawater desalination system will be described with reference to FIG. Figure 1
FIG. 1 is a schematic configuration diagram of a seawater desalination system.

As shown in FIG. 1, a seawater desalination system 100 according to the present embodiment includes an intake pump 111 which is an intake means for taking in seawater 1 and an insoluble material for removing insoluble matter 2 from the taken seawater 1. An insoluble matter removing device 120 which is a substance removing device, and a desalination device which is a desalination device which obtains clean water 3 and concentrated water 4 by permeating the seawater 1 to a reverse osmosis membrane (RO membrane) 132 by a high pressure pump 131. 130 and a sewage treatment device 1 which is a sewage treatment means for purifying the used sewage 5.
40 and concentrated water as a concentrated water treatment means for mixing and adjusting the concentrated water 4 and the purified water 6 from the sewage treatment device 140 so as to obtain the adjusted water 8 having a salt concentration substantially equal to the salt concentration of the seawater 1. And a processing device 150.

The insoluble matter removing device 120 comprises a filter 121 which is a filtering means for filtering the taken seawater 1, and an insoluble matter storage tank 122 for storing the filtered insoluble matter 2.

The desalination apparatus 130 is a high-pressure pump 131, the RO membrane 132, a clean water storage tank 133 for storing the clean water 3, and a water supply means for supplying the clean water 3 to the facility 10. A water supply pump 134 and a concentrated water storage tank 135 that stores the concentrated water 4 are provided.

The sewage treatment equipment 140 is used in the equipment 10
From the sewage storage tank 141 for storing the sewage 5 from the sewage, a sewage feed pump 142 which is a sewage feed means for sending the sewage 5 in the sewage tank 141, and a purification means for purifying the sewage 5 from the sewage feed pump 142 A purifying device 143 which is
Purified water storage tank 144 for storing purified water 6 and sewage 5
And a solid content storage tank 145 for storing the solid content 7 generated by the purification process.

The concentrated water treatment device 150 includes a stirring blade 15
1a and an adjusting tank 15 for adjusting the concentrated water 4 in the concentrated water storage tank 135 of the desalination apparatus 130.
1 and a purified water feed pump 152 for feeding the purified water 6 in the purified water storage tank 144 of the sewage treatment apparatus 140 into the adjusting tank 151. A purified water feed pump 153 that is a supply means, and a seawater salt concentration measuring device 154 that is a seawater salt concentration measuring means such as an electric conductivity meter that is provided in the vicinity of the intake port of the water intake pump 111 to measure salt concentration. A concentrated water salt concentration measuring instrument 155, which is a concentrated water concentration measuring means such as an electric conductivity meter attached to the concentrated water storage tank 135 of the desalination apparatus 130 and measuring the salt concentration of the concentrated water 4; The adjusting tank 151
Signals from the adjusted water salt concentration measuring device 156, which is a adjusted water salt concentration measuring means such as an electric conductivity meter or the like provided inside the measuring device, to measure the salt concentration of the adjusted water 8 and the salt concentration measuring devices 154-156. Based on the above, the feed pump 15 is adjusted so that the adjusted water 8 in the adjusting tank 151 has a salt concentration substantially equal to that of the seawater 1.
2, 153, which is a control unit for controlling
And a drainage pump 158 for discharging the adjusted water 8 in the adjusting tank 151 into the sea.

Such a seawater desalination system 100 is
It is operated as follows.

When the seawater 1 is taken in by the water intake pump 111,
The seawater 1 is the high pressure pump 1 of the desalination apparatus 130 after the insoluble matter 2 is removed by the filter 121 of the insoluble matter removal apparatus 120.
At 31, a high pressure (about 4 to 10 MPa) is supplied to the RO membrane 132, and a part of the water is filtered and desalinated to be stored in the clean water storage tank 133, and the rest is concentrated water 4 to be concentrated water. It is stored in the storage tank 135. The insoluble matter 2 removed by the filter 121 is stored in the insoluble matter storage tank 122.

The clean water 3 in the clean water storage tank 133 is
After being appropriately used as various domestic water such as drinking water in the facility 10, the sewage 5 is stored in the sewage storage tank 141 of the sewage treatment apparatus 140.

The sewage 5 in the sewage storage tank 141 is
After being sent to the purification device 143 by the sewage supply pump 142 and subjected to purification treatment, the purified water 6 is stored in the purified water storage tank 144. The solid content 7 generated by the purification process of the sewage 5 is stored in the solid content storage tank 145.

On the other hand, the controller 157 of the concentrated water treatment device 150 controls the salt concentration measurement result of the seawater 1 by the seawater salt concentration measuring device 154 and the concentrated water in the concentrated water storage tank 135 by the concentrated water concentration measuring device 155. Based on the salt concentration measurement result of No. 4, the concentrated water feed pump 152 and the purified water feed pump 153 are operated so as to obtain the adjusted water 8 having a salt concentration almost equal to that of the seawater 1, and the concentrated water is concentrated in the adjustment tank 151. Water 4 and purified water 6 are supplied, and stirring blade 151a is operated to perform mixing adjustment.

At this time, the control device 157 determines that the salt concentration of the adjusted water 8 is seawater 1 based on the measurement result of the salt concentration of the adjusted water 8 in the adjusting tank 151 by the adjusted water salt concentration measuring device 156.
It is confirmed whether the salt concentration is substantially equal to the salt concentration, and the concentrated water feed pump 152 and the purified water feed pump 153 are feedback-controlled.

The adjusted water 8 thus adjusted is discharged into the sea from the adjusting tank 151 by the operation of the discharge pump 158.

Therefore, according to the seawater desalination system 100 of the present embodiment, the concentrated water 4 having a high salt concentration, which is a by-product during the desalination of the seawater 1, is mixed with the purified water 6 obtained by purifying the sewage 5. Since the adjusted water 8 which is almost equivalent to the salt concentration of the seawater 1 is discharged into the sea, the seawater can be desalinated without changing the salt concentration in the surrounding sea area, which is environmentally generated. The problem can be greatly reduced.

In particular, such a seawater desalination system 10
0 is a place where it is difficult to secure clean water and strict environmental conservation standards, such as large-scale long-distance passenger ships such as luxury passenger ships on which passengers board, and resort hotels that are constructed on remote islands. It is extremely effective when applied to.

[Second Embodiment] A second embodiment in which the salt-containing water desalination system according to the present invention is applied to a seawater desalination system will be described with reference to FIG. FIG. 2 is a schematic configuration diagram of a seawater desalination system.
However, for the same parts as in the case of the first embodiment described above, by using the same reference numerals as those used in the description of the first embodiment described above, Descriptions that are the same as those in the implementation will be omitted.

As shown in FIG. 2, the seawater desalination system 200 according to the present embodiment has an intake pump 111 which is an intake means for taking in the seawater 1 and an insoluble material for removing the insoluble matter 2 from the taken seawater 1. An insoluble matter removing device 120 which is a substance removing device, and a desalination device which is a desalination device which obtains clean water 3 and concentrated water 4 by permeating the seawater 1 to a reverse osmosis membrane (RO membrane) 132 by a high pressure pump 131. 130 and a sewage treatment device 1 which is a sewage treatment means for purifying the used sewage 5.
40 and concentrated water as a concentrated water treatment means for mixing and adjusting the concentrated water 4 and the purified water 6 from the sewage treatment device 140 so as to obtain the adjusted water 8 having a salt concentration substantially equal to the salt concentration of the seawater 1. The treatment device 150 and a re-sending line 26 which is a resending means for sending at least a part of the purified water 6 from the sewage treatment device 130 to the high-pressure pump 131 of the desalination device 130 together with the seawater 1.
1, a switching valve 262 and the like.

One end of the re-sending line 261 is connected to the vicinity of the outlet of the purified water supply pump 153 of the concentrated water treatment device 150 via a switching valve 262, and the other end is connected to the high pressure pump 131 of the desalination device 130. Is connected near the entrance.

That is, the seawater desalination system 200 according to this embodiment has a structure in which the resending means is provided in the seawater desalination system 100 according to the first embodiment.

In such a seawater desalination system 200, the switching valve 262 allows the purified water 6 in the purified water storage tank 153 of the sewage treatment apparatus 140 to be received through the re-sending line 261 into the high pressure pump 131. When it is sent to the vicinity, after the seawater 1 is mixed with the purified water 6,
The high-pressure pump 131 of the desalination apparatus 130 is used for the RO membrane
2 will be supplied.

Here, the high-pressure pump 131 is the RO membrane 13
Since the seawater 1 supplied to the water 2 is mixed with the purified water 6 to reduce the salt concentration, the seawater 1 is supplied to the RO membrane 132.
The supply pressure to be supplied to will be small.

Specifically, for example, if seawater 1 and purified water 6 are mixed at a ratio of 4: 1, the salt concentration can be reduced to about 4/5. Can be reduced to about 9/10.

Therefore, according to the seawater desalination system 200 of the present embodiment, the same effects as in the case of the first embodiment described above can be obtained, and the operation of the high-pressure pump 131 can be performed. Since the power can be reduced (about 9/10), the energy can be effectively used.

Particularly, it is applied to a place where there is a limit in securing motive energy, such as a long-distance large passenger ship such as a luxury passenger ship on which passengers board, and a resort hotel constructed on a remote island. Then, it is extremely effective.

[Other Embodiments] Incidentally, the above-mentioned first,
In the second embodiment, the sewage treatment device 140 is
If the values of pollution factors such as COD, BOD, TOC, TN (total nitrogen content) and TP (total phosphorus content) of the sewage 5 are adjusted to be substantially the same as the seawater 1, Since the quality of the adjusted water 8 can be made closer to that of the seawater 1, environmental problems can be further reduced.

In the first and second embodiments described above, the insoluble matter 2 is mixed with the adjusted water 8 to be adjusted so as to have a concentration substantially equal to the concentration of the insoluble matter 2 in the seawater 1. Is, for example, provided with seawater turbidity measuring means for measuring the turbidity of the seawater 1 in the vicinity of the intake port of the intake pump 111,
Adjusted water turbidity measuring means for measuring the turbidity of the adjusted water 8 is provided in the adjusting tank 151, and the turbidity of the adjusted water 8 in the adjusting tank 151 is seawater 1 based on the measurement result of the turbidity measuring means. If the insoluble matter 2 in the insoluble matter storage tank 122 is supplied to the adjusting tank 151 so as to be substantially equivalent to the above, the amount of the insoluble matter 2 stored and stored in the insoluble matter storage tank 122 is significantly reduced. Therefore, more preferable results can be obtained.

Further, in the first and second embodiments described above, the insoluble matter removing device 120 is provided with a volume reducing means for incinerating the insoluble matter 2 removed from the seawater 1 to reduce the volume. In this case, the amount of the insoluble matter 2 to be stored and stored can be greatly reduced, so that a more preferable result can be obtained.

Here, insoluble matter 2 reduced in volume by incineration treatment
If it is supplied into the adjusting tank 151, more preferable results can be obtained.

[0040]

The salinity-containing water desalination system according to the first aspect of the present invention is a water intake means for taking in the salt-containing water, and the salt-containing water thus taken in is passed through the reverse osmosis membrane with a high-pressure pump to obtain clean water. Desalination means for obtaining concentrated water, sewage treatment means for purifying used sewage, and the concentrated water and the sewage treatment means so as to obtain adjusted water having a salt concentration substantially equal to the salt concentration of the salt-containing water. Since a concentrated water treatment means for mixing and adjusting the purified water from the above is provided, the concentrated water having a high salt concentration, which is a by-product during desalination of salt-containing water, is mixed with the purified water obtained by purifying the sewage. Since it can be discharged after making adjusted water that is approximately equivalent to the salt concentration of the salt-containing water, the salt-containing water can be desalinated without changing the salt concentration of the surrounding water area, which is environmentally friendly. The problems that occur can be greatly reduced.

The salt-containing water desalination system according to the second invention is the salt-containing water desalination system according to the first invention, wherein the sewage treatment means adjusts the value of the pollution factor of the sewage to be substantially equal to that of the salt-containing water. Therefore, the quality of the conditioned water can be made closer to that of the salt-containing water, and the environmental problems can be further reduced.

The salt-containing water desalination system according to the third aspect of the present invention is, in either of the first or second aspects, provided with an insoluble matter removing means for removing insoluble matter from the salt-containing water taken up. At the same time, the concentrated water treatment means adjusts the insoluble matter by mixing the adjusted water with the adjusted water so that the concentration of the insoluble matter in the salt-containing water is substantially equal to the concentration of the insoluble matter. Can be reduced to

A salt-containing water desalination system according to a fourth aspect of the present invention is the salt-containing water desalination system according to the third aspect, wherein the insoluble matter removing means incinerates the insoluble matter removed from the salt-containing water to reduce the volume. Since the volatilization means is provided, the amount of insoluble matter to be stored and stored can be greatly reduced.

A salt-containing water desalination system according to a fifth aspect of the present invention is the salt-containing water desalination system according to any one of the first to fourth aspects, wherein at least a part of the purified water from the sewage treatment means is combined with the salt-containing water. Since the re-sending unit for sending the desalination unit to the high-pressure pump is provided, the supply pressure of the high-pressure pump for supplying the salt-containing water to the reverse osmosis membrane can be reduced, so that the operating power of the high-pressure pump is reduced. Therefore, energy can be effectively used.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment when a salt-containing water desalination system according to the present invention is applied to a seawater desalination system.

FIG. 2 is a schematic configuration diagram of a second embodiment when the salt-containing water desalination system according to the present invention is applied to a seawater desalination system.

[Explanation of symbols] 1 seawater 2 Insoluble matter 3 clean water 4 concentrated water 5 sewage 6 purified water 7 solids 8 adjusted water 10 Equipment used 100 seawater desalination system 111 Water intake pump 120 Insoluble matter removal device 121 Filter 122 Insoluble matter storage tank 130 Desalination equipment 131 High pressure pump 132 Reverse osmosis membrane (RO membrane) 133 clean water storage tank 134 Water supply pump 135 Concentrated water storage tank 140 Sewage treatment equipment 141 Sewage storage tank 142 Sewer pump 143 Purification device 144 Purified water storage tank 145 Solid content storage tank 150 Concentrated water treatment device 151 adjustment tank 151a Stirrer 152 Concentrated water feed pump 153 Purified water feed pump 154 Seawater salt concentration measuring instrument 155 Concentrated water salt concentration measuring instrument 156 Adjusted water salt concentration measuring instrument 157 Control device 158 drainage pump 200 Seawater desalination system 261 Retransmission line 262 Switching valve

Claims (5)

[Claims] 1. A desalination means for taking in salt-containing water, a desalination means for permeating the taken-in salt-containing water to a reverse osmosis membrane with a high-pressure pump to obtain clean water and concentrated water, and used sewage And a concentrated water treatment for mixing and adjusting the concentrated water and the purified water from the sewage processing means so as to obtain adjusted water having a salt concentration substantially equal to the salt concentration of the salt-containing water. And a salt-containing water desalination system. 2. The salt-containing water desalination system according to claim 1, wherein the sewage treatment means adjusts the value of the pollution factor of the sewage to be substantially equal to that of the salt-containing water. 3. The insoluble matter removing device according to claim 1, further comprising an insoluble matter removing device that removes insoluble matter from the salt-containing water that has been taken in, and the concentrated water treating device has the salt-containing water. A salt-containing water desalination system, characterized in that the insoluble matter is mixed with the adjusted water so as to have a concentration substantially equal to that of the insoluble matter. 4. The salt-containing water according to claim 3, wherein the insoluble matter removing means includes a volume reducing means for incinerating the insoluble matter removed from the salt-containing water to reduce the volume. Desalination system. 5. The resending means for sending at least part of the purified water from the sewage treatment means to the high-pressure pump of the desalination means together with the salt-containing water according to any one of claims 1 to 4. A salt-containing water desalination system comprising: