WO2014109075A1

WO2014109075A1 - Seawater desalination apparatus and seawater desalination apparatus washing method

Info

Publication number: WO2014109075A1
Application number: PCT/JP2013/057304
Authority: WO
Inventors: 諒難波; 勝也横川; 武士松代; 太黒川; 後藤　久明
Original assignee: 株式会社東芝
Priority date: 2013-01-10
Filing date: 2013-03-14
Publication date: 2014-07-17
Also published as: JP2014133214A; JP5710655B2

Abstract

According to an embodiment, the seawater desalination apparatus is provided with: a reverse osmosis membrane for separating seawater into fresh water and concentrated seawater; a pre-treatment water tank for storing seawater or fresh water to be sent to the reverse osmosis membrane; a permeate tank, which is supplied with water from the fresh water-discharging side of the reverse osmosis membrane; an aqueous washing pump to which water is supplied from the permeate tank and which conveys water to the pre-treatment water tank; a washing water tank that is provided with a stirrer and is supplied with water from the fresh water-discharging side and the concentrated seawater-discharging side of the osmosis membrane; a washing pump for pumping washing solution from the washing water tank and conveying the water to a stage before the reverse osmosis membrane; and a controller for controlling the actions of the aqueous washing pump, the stirrer, and the washing pump.

Description

Seawater desalination apparatus and cleaning method for seawater desalination apparatus

Embodiments of the present invention relate to a seawater desalination apparatus and a method for cleaning a seawater desalination apparatus.

な With the global water problem becoming more serious, business competition on a global scale is accelerating on the water business as a huge market. In Middle Eastern countries that do not have surface water such as rivers or groundwater as a water source, or in regions with a high risk of drought in Japan, seawater desalination technology has been introduced and large-scale seawater desalination plants have been constructed to secure water sources. The conventional seawater desalination technology has been mainly the evaporation method in which seawater is condensed and recovered after heating and evaporation, but in recent years, a reverse osmosis membrane (hereinafter referred to as RO membrane) has been used from the viewpoint of economy. The methods that were being used are expanding.

JP 2011-83683 A JP 2011-104504 A

FIG. 1 is a diagram schematically illustrating a configuration example of a seawater desalination apparatus according to a first embodiment. FIG. 2 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the second embodiment. Drawing 3 is a figure showing roughly the example of 1 composition of the seawater desalination apparatus of a 3rd embodiment. FIG. 4 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the fourth embodiment. FIG. 5 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the fifth embodiment. FIG. 6 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the sixth embodiment. FIG. 7 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the seventh embodiment. FIG. 8 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the eighth embodiment. FIG. 9 is a diagram illustrating an example of a deterioration factor according to a change in a value measured by the sensor group in the infusion medicine switching machine illustrated in FIG. FIG. 10 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the tenth embodiment.

Hereinafter, the seawater desalination apparatus and the seawater desalination apparatus cleaning method of the embodiment will be described with reference to the drawings.

In the seawater desalination apparatus of this embodiment, a method using an RO membrane is adopted. Seawater desalination by the RO membrane is generally more energy efficient than the evaporation method, but the permeation performance of the RO membrane deteriorates due to clogging. Therefore, in the seawater desalination plant using the RO membrane, it is necessary to clean the RO membrane in order to eliminate the deterioration phenomenon (fouling) caused by clogging. Therefore, the seawater desalination apparatus of the present embodiment includes a cleaning facility for cleaning the RO membrane.

FIG. 1 is a diagram schematically illustrating a configuration example of a seawater desalination apparatus according to a first embodiment. The seawater desalination apparatus of this embodiment includes a pretreatment water tank 2, a supply pump 4, a cartridge filter 6, a high pressure pump 8, an RO module 10, a permeate water tank 12, a water washing pump 14, and a washing pump 16. The cleaning water tank 18 and a pipe for connecting the above-described components are provided. A valve (not shown) is appropriately attached to a portion where the pipe branches, and the path through which seawater or fresh water flows can be switched. The water washing pump 14, the washing pump 16 and the washing water tank 18 are washing facilities for washing the RO module 10.

The pretreatment water tank 2 is a water tank for storing seawater after appropriate pretreatment such as removing turbidity according to the quality of the taken seawater. The pretreatment water tank 2 is used not only to store seawater to be supplied to the RO module 10 but also to store fresh water and cleaning liquid used when the RO module 10 described later is cleaned.

The supply pump 4 feeds the seawater stored in the pretreatment water tank 2 to the high-pressure pump 8 through the cartridge filter 6.

The cartridge filter 6 is installed between the supply pump 4 and the high-pressure pump 8 and filters foreign matters such as pretreated seawater supplied from the supply pump.

The high-pressure pump 8 increases the pressure of the pretreated seawater to a state higher than the osmotic pressure of the seawater and sends the water to the RO module 10.

The RO module 10 includes an RO membrane, removes salt contained in seawater with the RO membrane, and generates fresh water as permeate. The salt removed by the RO module 10 is drained as concentrated water together with water that has not been desalinated.

The permeated water tank 12 is a water tank that stores a water tank that has passed through the RO module 10, and is supplied with water from the fresh water discharge side of the RO module 10.

Next, a cleaning facility for the seawater desalination apparatus of the present embodiment will be described.
The water washing pump 14 is supplied with water from the permeated water tank 12. The water washing pump 14 pumps up fresh water stored in the permeated water tank 12 and feeds it to the pretreatment water tank 2 or the front stage of the RO module 10. A water supply path from the water washing pump 14 to the pretreatment water tank 2 and a water supply path from the water washing pump 14 to the previous stage of the RO module 10 are switched by a valve (not shown) provided in the pipe. The pipe X branched from the pipe connecting the rinsing pump 14 and the pretreatment water tank 2 can be omitted when it is not necessary to feed water from the rinsing pump 14 to the upstream stage of the RO module 10.

The cleaning water tank 18 is a water tank for storing the cleaning liquid, and includes a stirrer 180 for stirring the cleaning liquid. The washing water flows into the washing water tank 18 from the piping on the side where the fresh water that has passed through the RO module 10 is discharged and the piping on the side where the concentrated seawater that has not passed through the RO module 10 is discharged.

The cleaning pump 16 sends the cleaning liquid stored in the cleaning water tank 18 to the front stage of the RO module 10. The cleaning liquid sent from the cleaning water tank 18 by the cleaning pump 16 circulates between the RO module 10 and the cleaning water tank 18.

The operations of the supply pump 4, the high pressure pump 8, the water washing pump 14, the washing pump 16, and the stirrer 180 are controlled by the controller CTR of the monitoring control system.

Hereinafter, an example of a procedure for cleaning the RO module 10 in the seawater desalination apparatus of the present embodiment will be described.
The controller CTR stores permeate, which is fresh water discharged from the permeate tank 12 in advance, in the wash water tank 18.

Subsequently, a chemical is mixed into the fresh water in the cleaning water tank 18 to create a cleaning liquid. At this time, the type and amount of the medicine are selected according to the cause and state of fouling. Further, the controller CTR uses the stirrer 180 in the cleaning water tank 18 to mix in order to make the concentration of the cleaning liquid uniform.

Subsequently, the controller CTR operates the cleaning pump 16 to flow the cleaning liquid prepared in the cleaning water tank 18 to the RO module 10 and causes the cleaning pump 16 to circulate it. The cleaning liquid discharged to the pipe on the side from which the permeate flowing through the RO module 10 is discharged and the cleaning liquid discharged to the pipe on the side from which the concentrated seawater is discharged are sent to the washing water tank 18 and again the washing pump. 16 to the RO module 10.

Next, the controller CTR stops the cleaning pump 16 and immerses the RO membrane in the cleaning liquid filled in the RO module 10, and the cleaning liquid in the piping connecting the cleaning water tank 18, the cleaning pump 16, and the RO module 10. Stop the flow and let it soak.

Next, the controller CTR operates the water washing pump 14 to feed the fresh water in the permeated water tank 12 to the pretreatment water tank 2, and the pretreatment water tank 2, the supply pump 4, the cartridge filter 6, the high pressure pump 8, and the RO Rinse the module 10. The fresh water used for washing is not sent to the permeate tank 12 but drained after being discharged from the RO module 10.

In addition to sodium chloride, seawater flowing through the pipes of seawater desalination equipment contains many substances such as organic substances, microorganisms, and trace amounts of metal elements that become fouling factors. For example, there is a possibility that the metal element is deposited as a scale in the piping due to fluctuations in the pH (hydrogen ion concentration) and water temperature of seawater. By taking the above configuration, in addition to the supply pump, the cartridge filter, the high pressure pump, and the RO module, the cartridge filter, the high pressure pump, and the RO module can be washed with water. Therefore, not only the RO module but also other facilities required for seawater desalination can be washed with water to keep the inside of the piping hygienic. Moreover, if the material of a water tank, a pump, and piping is a thing weak to corrosion, the effect which suppresses corrosion can also be anticipated by washing away with fresh water.

Next, the seawater desalination apparatus and the seawater desalination apparatus cleaning method of the second embodiment will be described in detail with reference to the drawings. In the present embodiment, a case where a plurality of facilities necessary for seawater desalination are installed in a seawater desalination plant having a larger scale than that of the first embodiment described above will be described. In the following description, the same components as those in the first embodiment described above are denoted by the same reference numerals and description thereof is omitted.

FIG. 2 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the present embodiment.
In the following embodiments, a case where two series of facilities necessary for seawater desalination are installed will be described, but the same configuration can be adopted even when three or more series of facilities are installed.

The seawater desalination apparatus of the present embodiment has a first series of seawater desalination equipment and a second series of seawater desalination equipment.

The first series of seawater desalination equipment includes a first pretreatment water tank 2A, a first supply pump 4A, a first cartridge filter 6A, a first high pressure pump 8A, a first RO module 10A, and a first permeate water tank 12A. And.

The second series of seawater desalination equipment includes a second pretreatment water tank 2B, a second supply pump 4B, a second cartridge filter 6B, a second high pressure pump 8B, a second RO module 10B, and a second permeated water tank 12B. And.

The first series of seawater desalination equipment and the second series of seawater desalination equipment share a flush pump 14, a wash pump 16, and a wash water tank 18.

The flush pump 14 pumps up the permeated water stored in the first permeated water tank 12A or the second permeated water tank 12B and feeds it to the first pretreated water tank 2A or the second pretreated water tank 2B.

Wash water flows into the wash water tank 18 from the pipe on the side where the fresh water that has passed through the first RO module 10A is discharged and the pipe on the side from which the concentrated seawater that has not passed through the first RO module 10A is discharged, Line clean water flows in from the pipe on the side where the fresh water that has passed through the second RO module 10B is discharged and the pipe on the side where the concentrated seawater that has not passed through the second RO module 10B is discharged.

The cleaning pump 16 draws out the cleaning water stored in the cleaning water tank 18 and sends it to the front stage of the first RO module 10A or the front stage of the second RO module 10B.

The configuration other than the above is the same as that of the first embodiment described above, and seawater desalination is performed in each of the first series and the second series as in the first embodiment.

Hereinafter, an example of a procedure for cleaning the first RO module 10A in the seawater desalination apparatus of the present embodiment will be described. Although the cleaning of the first RO module 10A will be described here, the procedure for cleaning the other series of RO modules is the same.

The controller CTR stores permeated water, which is fresh water discharged from the first RO module 10A or the second RO module 10B, in the washing water tank 18 in advance.

Subsequently, a chemical is mixed into the fresh water in the cleaning water tank 18 to create a cleaning liquid. At this time, the type and amount of the medicine are selected according to the cause and state of fouling. Further, the controller CTR mixes the chemical and the fresh water using the stirrer 180 in the cleaning water tank 18 in order to make the concentration of the cleaning liquid uniform.

Subsequently, the controller CTR operates the cleaning pump 16 to cause the cleaning liquid prepared in the cleaning water tank 18 to flow to the first RO module 10 </ b> A and circulates by the cleaning pump 16. The cleaning liquid discharged to the pipe on the side where the permeate flowing through the first RO module 10A is discharged and the cleaning liquid discharged to the pipe on the side where the concentrated seawater is discharged are sent to the washing water tank 18 and washed again. The pump 16 sends the first RO module 10A.

Next, the controller CTR stops the cleaning pump 16 and immerses the RO membrane in the cleaning liquid filled in the first RO module 10A, and in the piping connecting the cleaning water tank 18, the cleaning pump 16, and the first RO module 10A. Also soak in the cleaning solution.

Next, the controller CTR operates the water washing pump 14 to supply fresh water in the first permeated water tank 12A or the second permeated water tank 12B to the first pretreated water tank 2A, and the first pretreated water tank 2A and the first supply. The pump 4A, the first cartridge filter 6A, the first high-pressure pump 8A, and the first RO module 10A are washed away. The fresh water used for the washing is not sent to the first permeate tank 12A, but drained after being discharged from the first RO module 10A.

At this time, even if there is not enough fresh water in the first permeated water tank 12A, the first RO module 10A can be cleaned by sending fresh water from the second permeated water tank 12B to the first pretreatment water tank 2A. Since the second series of seawater desalination apparatuses can perform seawater desalination even during the cleaning of the first RO module 10A, the first RO module 10A is washed while generating fresh water in the second series. Also good.

Therefore, by making the permeated water available from other permeated water tanks, it is possible to perform washing using sufficient permeated water even when the water level of the permeated water tanks for washing is low. Further, if the number of series is further increased, the amount of permeated water used for washing can be accommodated in many series, so that the water level in the permeated water tank can be easily maintained between the series.

By adopting the above configuration, not only the first RO module 10A but also the configuration from the first pretreatment water tank 2A to the first high pressure pump 8A and substances such as scales, organic matter, and microorganism-derived biofilms deposited in the pipes are washed away. And the inside of the piping can be kept hygienic. Moreover, if the material of a water tank, a pump, and piping is a thing weak to corrosion, the effect which suppresses corrosion can also be anticipated by washing away with fresh water.

Next, a seawater desalination apparatus and a method for cleaning the seawater desalination apparatus according to the third embodiment will be described with reference to the drawings. In this embodiment, the washing water tank is shared with the pretreatment water tank.

FIG. 3 is a diagram schematically showing a configuration example of the seawater desalination apparatus of the present embodiment.
The seawater desalination apparatus of the present embodiment has a first series of seawater desalination equipment and a second series of seawater desalination equipment, and the cleaning pump 16 and the cleaning water tank 18 of the second embodiment are omitted. .

The first series of seawater desalination equipment includes a first pretreatment water tank 2A, a first supply pump 4A, a first cartridge filter 6A, a first high pressure pump 8A, a first RO module 10A, and a first permeate water tank 12A. And. The first pretreatment water tank 2A includes a stirrer 20A.

The second series of seawater desalination equipment includes a second pretreatment water tank 2B, a second supply pump 4B, a second cartridge filter 6B, a second high pressure pump 8B, a second RO module 10B, and a second permeated water tank 12B. And. The second pretreatment water tank 2B includes a stirrer 20B.

The first series of seawater desalination equipment and the second series of seawater desalination equipment share a flush pump 14. That is, the rinsing pump 14 pumps up the permeated water stored in the first permeated water tank 12A or the second permeated water tank 12B and sends it to the first pretreated water tank 2A or the second pretreated water tank 2B.

The configuration other than the above is the same as that of the first embodiment described above, and the seawater desalination process is performed in the seawater desalination facilities of the first and second series as in the first embodiment.

The controller CTR first stores fresh water in the first pretreatment water tank 2A using the water washing pump 14 before washing, as preparation of the washing liquid. At this time, the fresh water sent to the first pretreatment water tank 2A may be pumped from either the first permeated water tank 12A or the second permeated water tank 12B.

Thereafter, a chemical is mixed into the fresh water in the first pretreatment water tank 2A, and mixed with the stirrer 20A to prepare a cleaning liquid. The type and amount of chemicals are selected according to the cause and condition of fouling.

Subsequently, the controller CTR operates the supply pump 4A to supply the cleaning liquid prepared in the first pretreatment water tank 2A to the first cartridge filter 6A, the first high pressure pump 8A, and the first RO module 10A. The cleaning liquid discharged from the first RO module 10A returns to the first permeated water tank 12A.

Subsequently, the controller CTR stops the rinsing pump 14 and the supply pump 4A, immerses the RO membrane in the cleaning liquid filled in the first RO module 10A, and also includes the first pretreatment water tank 2A, the supply pump 4A, the first The piping connecting the one cartridge filter 6A, the first high-pressure pump 8A, and the first RO module 10A is also immersed in the cleaning liquid.

Next, the controller CTR operates the water washing pump 14 to store fresh water in the first pretreatment water tank 2A. At this time, if the cleaning liquid remains in the first pretreatment water tank 2A, the first supply pump 4A is operated to draw out the cleaning liquid from the first pretreatment water tank 2A, and then fresh water is stored in the first pretreatment water tank 2A. May be. After a predetermined amount of fresh water is stored in the first pretreatment water tank 2A, the controller CTR operates the supply pump 4A to send fresh water to the first cartridge filter 6A, the first high pressure pump 8A, and the first RO module 10A for washing. The fresh water discharged from the first RO module 10A is drained.

At this time, even if sufficient fresh water is not stored in the first permeated water tank 12A, fresh water is sent from the second permeated water tank 12B to the first pretreatment water tank 2A to wash the first RO module 10A. it can. Even during the cleaning of the first RO module 10A, the second series of seawater desalination apparatuses can perform seawater desalination treatment, so the first RO module 10A is cleaned while generating fresh water in the second series. May be. Accordingly, by making the permeated water available from other permeated water tanks, it is possible to perform washing using sufficient permeated water even when the water level of the permeated water tanks of the washing series is low. Further, if the number of series is further increased, the amount of permeated water used for washing can be accommodated in many series, so that the water level in the permeated water tank can be easily maintained between the series.

By adopting a plant configuration in which the pretreatment water tank also functions as a washing water tank as described above, it is not necessary to install a washing water tank and a washing pump, and the elements constituting the plant can be reduced. The initial cost and footprint can be reduced.

Further, not only the first RO module 10A but also the structure from the first pretreatment water tank 2A to the first high-pressure pump 8A and substances such as scales, organic substances, and microorganism-derived biofilms deposited in the piping can be washed away. Therefore, in addition to the purpose of cleaning the RO module, it is necessary not only for the RO module but also for other seawater desalination by preparing a cleaning solution for the purpose of washing away substances such as scales, organic substances, and microorganism-derived biofilms deposited in the piping. Clean equipment and keep the inside of the pipes hygienic. Moreover, if the material of a water tank, a pump, and piping is a thing weak to corrosion, the effect which suppresses corrosion can also be anticipated by washing away with fresh water.

That is, according to the seawater desalination apparatus of the present embodiment, the equipment used for seawater desalination can be washed without having a washing water tank or a washing pump, reducing initial cost and manual operation by the user. The seawater desalination apparatus to reduce and the washing | cleaning method of a seawater desalination apparatus can be provided.

Next, the seawater desalination apparatus and the seawater desalination apparatus cleaning method of the fourth embodiment will be described with reference to the drawings.

FIG. 4 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the present embodiment.
The seawater desalination apparatus of the present embodiment has a first series of seawater desalination equipment and a second series of seawater desalination equipment.

The first series of seawater desalination equipment and the second series of seawater desalination equipment share a flush pump 14, a chemical injection pump 19, and a mixer (stirring means) MX. The rinsing pump 14 pumps up the permeated water stored in the first permeated water tank 12A or the second permeated water tank 12B and sends it to the first pretreated water tank 2A or the second pretreated water tank 2B.

The chemical injection pump 19 is installed so that the discharge port thereof is the latter stage of the flush pump 14 and injects chemicals into the fresh water sent from the flush pump 14. The operation of the medicine pump 19 is controlled by the controller CTR.

The mixer MX is disposed downstream from the discharge port of the chemical injection pump 19 and upstream of the first pretreatment water tank 2A and the second pretreatment water tank 2B, and agitates the cleaning liquid into which the chemicals are injected.

Therefore, in the third embodiment, the first pretreatment water tank 2A and the second pretreatment water tank 2B were equipped with the

stirrers

20A and 20B. However, in this embodiment, since the cleaning liquid is stirred by the mixer MX, the

stirrer

20A, 20B can be omitted.

The controller CTR switches the type of cleaning liquid by switching the chemical injected from the chemical injection pump 19 as preparation of the cleaning liquid. Subsequently, the controller CTR supplies fresh water to the first pretreatment water tank 2A using the water washing pump 14 before washing. At this time, the fresh water sent to the first pretreatment water tank 2A may be pumped from either the first permeated water tank 12A or the second permeated water tank 12B. Here, the controller CTR operates the chemical injection pump 19 and the mixer MX, injects chemicals into the fresh water discharged from the water washing pump 14, and stores the washing liquid after stirring in the first pretreatment water tank 2A. If the chemical injection pump 19 is linked to the monitoring control system, cleaning can be automated. The type and amount of chemicals are selected according to the cause and condition of fouling.

Subsequently, the controller CTR operates the first supply pump 4A to supply the cleaning liquid prepared in the first pretreatment water tank 2A to the first cartridge filter 6A, the first high pressure pump 8A, and the first RO module 10A. . The cleaning liquid discharged from the first RO module 10A is returned to the first permeated water tank 12A and circulated.

Next, the controller CTR operates the water washing pump 14 to store fresh water in the first pretreatment water tank 2A. At this time, when it is desirable that no cleaning liquid remains in the first pretreatment water tank 2A, the first supply pump 4A is operated to pump out the cleaning liquid in the first pretreatment water tank 2A, and then to the first pretreatment water tank 2A. You may store fresh water. After a predetermined amount of fresh water is stored in the first pretreatment water tank 2A, the controller CTR operates the supply pump 4A to send fresh water to the first cartridge filter 6A, the first high pressure pump 8A, and the first RO module 10A for washing. The fresh water discharged from the first RO module 10A is drained.

By using the seawater desalination apparatus as described above, the effects similar to those of the third embodiment described above can be obtained, and the energy for mixing the cleaning liquid is provided by the water flow by the water washing pump and the mixer. When the energy efficiency of the water washing pump is better than that, the effect of reducing power consumption can be expected.

That is, according to the seawater desalination apparatus of the present embodiment, it is possible to clean equipment used for seawater desalination without having a stirrer, reducing initial costs and reducing user manual operations. The apparatus and the washing | cleaning method of a seawater desalination apparatus can be provided.

Next, a seawater desalination apparatus and a cleaning method of the seawater desalination apparatus according to the fifth embodiment will be described with reference to the drawings.

FIG. 5 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the present embodiment.
The seawater desalination apparatus of the present embodiment has a first series of seawater desalination equipment and a second series of seawater desalination equipment.

The first series of seawater desalination equipment and the second series of seawater desalination equipment share the chemical injection pump 19 and the mixer MX.

The chemical injection pump 19 is installed so that the discharge port thereof is located after the first permeate tank 12A and the second permeate tank 12B, and injects chemicals into the fresh water discharged from the first permeate tank 12A and the second permeate tank 12B. To do. The operation of the medicine pump 19 is controlled by the controller CTR.

The mixer MX is located downstream from the discharge port of the chemical injection pump 19 and upstream of the first supply pump 4A and the second supply pump 4B, and agitates the cleaning liquid into which the chemical has been injected. Therefore, similarly to the fourth embodiment, in this embodiment, since the cleaning liquid is stirred by the mixer MX, the

stirrers

20A and 20B can be omitted.

Further, in the present embodiment, the cleaning liquid stirred by the mixer MX is supplied to the upstream piping of the first supply pump 4A and the second supply pump 4A. By adopting such a configuration, in this embodiment, the first supply pump 4A and the second supply pump 4B can also function as the flush pump 14 of the first to fourth embodiments. Therefore, it is not necessary to install the water washing pump 14, and the elements constituting the seawater desalination apparatus can be reduced, which can contribute to the reduction of the initial cost and the water footprint of the seawater desalination plant.

Hereinafter, an example of a procedure for cleaning the first RO module 10A in the seawater desalination apparatus of the present embodiment will be described. Although the cleaning of the first RO module 10A will be described here, the procedure for cleaning other series of RO modules is the same.

The controller CTR switches the type of cleaning liquid by switching the chemical injected from the chemical injection pump 19 as preparation of the cleaning liquid. Subsequently, the controller CTR operates the first supply pump 4A to pump fresh water from the first permeated water tank 12A or the second permeated water tank 12B. At this time, the fresh water sent to the first pretreatment water tank 2A may be pumped from either the first permeated water tank 12A or the second permeated water tank 12B. Here, the controller CTR operates the chemical injection pump 19 and the mixer MX, injects chemicals into the fresh water pumped up by the first supply pump 4A, and purifies the cleaning liquid by stirring. The kind and amount of medicine injected by the medicine pump 19 are selected according to the cause and state of fouling. In addition, if the chemical injection pump 19 is linked with the monitoring control system, cleaning can be automated.

The cleaning liquid purified as described above is supplied to the first supply pump 4A. The cleaning liquid sent from the first supply pump 4A is sequentially sent to the first cartridge filter 6A, the first high-pressure pump 8A, and the first RO module 10A. The cleaning liquid discharged from the first RO module 10A is drained.

After flowing the cleaning liquid to the first cartridge filter 6A, the first high-pressure pump 8A, and the first RO module 10A as described above for a predetermined period to fill the first RO module 10A with the cleaning liquid, the pipe is switched to change the first RO The cleaning liquid discharged from the module 10A is returned to the front stage of the first supply pump 4A and circulated. When the water hammer phenomenon occurs due to the switching of the pipeline, for example, measures are taken to prevent the water hammer such as attaching a soft starter to the first supply pump 4A and the second supply pump 4B.

Subsequently, the controller CTR stops the first supply pump 4A, immerses the RO membrane in the cleaning liquid filled in the first RO module 10A, and supplies the supply pump 4A, the first cartridge filter 6A, and the first high-pressure pump 8A. The pipe connecting the first RO module 10A is also immersed in the cleaning liquid.

Next, the controller CTR operates the first supply pump 4A to draw fresh water from the first permeated water tank 12A and the second permeated water tank 12B, and supplies fresh water to the first cartridge filter 6A, the first high pressure pump 8A, and the first RO module 10A. Wash with water. The fresh water discharged from the first RO module 10A is drained.

By using the seawater desalination apparatus as described above, it is possible to obtain the same effect as that of the above-described fourth embodiment, and it is not necessary to install a water washing pump, and the elements constituting the plant can be reduced. This can contribute to the reduction of the initial cost and water footprint of the seawater desalination plant.

That is, according to the seawater desalination apparatus of this embodiment, the equipment used for seawater desalination can be cleaned without having a water washing pump, reducing initial costs and reducing manual operation by the user. It is possible to provide a cleaning method for a purification apparatus and a seawater desalination apparatus.

Next, a seawater desalination apparatus and a method for cleaning the seawater desalination apparatus according to the sixth embodiment will be described with reference to the drawings.

FIG. 6 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the present embodiment.
The seawater desalination apparatus of the present embodiment has a first series of seawater desalination equipment and a second series of seawater desalination equipment.

The mixer MX is located downstream from the discharge port of the chemical injection pump 19 and upstream of the first supply pump 4A and the second supply pump 4B, and agitates the cleaning liquid into which the chemical has been injected. Therefore, similarly to the fifth embodiment, in this embodiment, since the cleaning liquid is stirred by the mixer MX, the

stirrers

20A and 20B can be omitted.

Further, in the present embodiment, the cleaning liquid stirred by the mixer MX is supplied to the upstream piping of the first supply pump 4A and the second supply pump 4A. By adopting such a configuration, in this embodiment, the function of the water washing pump 14 of the first to fourth embodiments can be shared by the first supply pump 4A and the second supply pump 4B. Therefore, it is not necessary to install the water washing pump 14, and the elements constituting the seawater desalination apparatus can be reduced, which can contribute to the reduction of the initial cost and footprint of the seawater desalination plant.

Furthermore, in this embodiment, the fresh water discharged from the first RO module 10A and the second RO module 10B is directly supplied to the first supply pump 4A and the second supply without going through the first pretreatment water tank 2A and the second pretreatment water tank 2B. A pipe is connected to the front stage of the pump 4B so that supply is possible. That is, the fresh water drainage side of the first RO module 10A and the second RO module 10B is connected to the front stage of the plurality of

supply pumps

4A, 4B by piping.

By adopting such a configuration, for example, even when there is an abnormality such as a failure in the first series of pumps, the first RO module 10A can be cleaned without using the cleaning series of pumps. That is, when the first supply pump 4A of the first series fails and does not operate, the fresh water discharged from the second RO module 10B by the second high-pressure pump 8B is supplied to the first supply without going through the second permeate tank 12B. By supplying the first stage of the pump 4A, the first series can be washed.

At this time, since the RO membrane is cleaned by a high-pressure pump of a system different from the system to be cleaned, when the energy consumption efficiency of the high-pressure pump is higher than that of the supply pump, the effect of reducing power consumption is achieved. Can also be expected.

The controller CTR switches the type of cleaning liquid by switching the chemical injected from the chemical injection pump 19 as preparation of the cleaning liquid. Subsequently, the controller CTR operates the first supply pump 4A or the second high-pressure pump 8B to supply fresh water discharged from the second RO module 10B to the front stage of the first supply pump 4A. Here, the controller CTR operates the chemical injection pump 19 and the mixer MX, injects chemicals into the fresh water sent to the first supply pump 4A, and purifies the cleaning liquid by stirring. The type and amount of medicine to be injected from the medicine pump 19 are selected according to the cause and state of fouling. In addition, if the chemical injection pump 19 is linked with the monitoring control system, cleaning can be automated.

The cleaning liquid sent from the first supply pump 4A is sequentially sent to the first cartridge filter 6A, the first high-pressure pump 8A, and the first RO module 10A. The cleaning liquid discharged from the first RO module 10A is drained.

After a predetermined period of time, as described above, the cleaning liquid is supplied to the first cartridge filter 6A, the first high-pressure pump 8A, and the first RO module 10A to fill the first RO module 10A with the cleaning liquid. The cleaning liquid discharged from 10A is returned to the front stage of the first supply pump 4A and circulated. When the water hammer phenomenon occurs due to the switching of the pipeline, for example, measures are taken to prevent the water hammer such as attaching a soft starter to the first supply pump 4A and the second supply pump 4B.

Subsequently, the controller CTR stops the chemical injection pump 19, the mixer MX, and the second high-pressure pump 8B, immerses the RO membrane in the cleaning liquid filled in the first RO module 10A, and the first pretreatment water tank. 2A, the supply pump 4A, the first cartridge filter 6A, the first high-pressure pump 8A, and the pipe connecting the first RO module 10A are also immersed in the cleaning liquid.

Next, the controller CTR operates the second high-pressure pump 8B, and the fresh water discharged from the second RO module 10B is converted into the first supply pump 4A, the first cartridge filter 6A, the first high-pressure pump 8A, and the first RO module 10A. Send fresh water to and wash. The fresh water discharged from the first RO module 10A is drained.

By using the seawater desalination apparatus as described above, it is possible to provide a seawater desalination apparatus and a method for cleaning the seawater desalination apparatus that can obtain the same effects as those of the fifth embodiment described above.

Next, a seawater desalination apparatus and a cleaning method for the seawater desalination apparatus according to the seventh embodiment will be described with reference to the drawings.

FIG. 7 is a diagram schematically showing a configuration example of the seawater desalination apparatus of the present embodiment.
The seawater desalination apparatus of the present embodiment has a first series of seawater desalination equipment and a second series of seawater desalination equipment.

In the present embodiment, the fresh water drain side of the first RO module 10A and the second RO module 10B is connected to the previous stage of the first RO module 10A and the second RO module 10B by piping. Therefore, the cleaning liquid stirred by the mixer MX is supplied to the front stage of the first RO module 10A and the second RO module 10B. By adopting such a configuration, the RO module can be cleaned even when the materials of the supply pump, the high-pressure pump, and the cartridge filter are not resistant to the chemicals used for the cleaning liquid.

Other than the above configuration, the seawater desalination apparatus of the present embodiment has the same configuration as the seawater desalination apparatus of the sixth embodiment described above.

The controller CTR switches the type of cleaning liquid by switching the chemical injected from the chemical injection pump 19 as preparation of the cleaning liquid. The type and amount of medicine to be injected from the medicine pump 19 are selected according to the cause and state of fouling. In addition, if the chemical injection pump 19 is linked with the monitoring control system, cleaning can be automated.

Subsequently, the controller CTR operates the second high-pressure pump 8B and supplies fresh water discharged from the second RO module 10B to the front stage of the first RO module 10A. Here, the controller CTR operates the chemical injection pump 19 and the mixer MX, injects the chemical into the fresh water sent to the first RO module 10A, and purifies the cleaning liquid by stirring.

The cleaning liquid sent to the first stage of the first RO module 10A passes through the first RO module 10A and is drained from the pipe on the concentrated seawater side and the pipe on the fresh water side.

After flowing the cleaning liquid to the first RO module 10A for a predetermined period to fill the first RO module 10A with the cleaning liquid, the controller CTR stops the medicine injection pump 19, the mixer MX, and the second high-pressure pump 8B, and the first RO module 10A. The RO membrane is immersed in the cleaning liquid filled inside. As described above, in the present embodiment, since the cleaning liquid cannot be circulated, the cleaning liquid is supplied to the RO module by a high-pressure pump of a series different from the series to be cleaned, and the cleaning liquid is drained without being circulated.

Next, the controller CTR operates the second high-pressure pump 8B to send fresh water discharged from the second RO module 10B to the first RO module 10A and wash it with water. The fresh water discharged from the first RO module 10A is drained.

By using the seawater desalination apparatus as described above, it is possible to provide a seawater desalination apparatus and a method for cleaning the seawater desalination apparatus that can obtain the same effects as those of the sixth embodiment described above.

Next, the seawater desalination apparatus and the seawater desalination apparatus cleaning method of the eighth embodiment will be described with reference to the drawings.

FIG. 8 is a diagram schematically showing a configuration example of the seawater desalination apparatus of the present embodiment.
The seawater desalination apparatus of the present embodiment has a first series of seawater desalination equipment and a second series of seawater desalination equipment.

The first series of seawater desalination equipment measures the supply pressure to the first RO module 10A, the pressure on the concentrated water side and the permeate side, the permeate flow rate, the change in the electrical conductivity of the supply water and the permeate, and the first temperature. It has a sensor group SSA. The first sensor group SSA includes a sensor that measures the temperature (T), electrical conductivity (EC), and pressure (P) of seawater flowing into the first RO module 10A, and the pressure of the concentrated seawater discharged from the first RO module 10A. A sensor for measuring (P) and a sensor for measuring the permeation flow rate (F), electrical conductivity (EC) and pressure (P) of fresh water discharged from the first RO module 10A.

Similarly, the seawater desalination apparatus of the second series measures the supply pressure to the second RO module 10B, the pressure on the concentrated water side and the permeate side, the permeate flow rate, the change in the electrical conductivity of the supply water and the permeate, and the water temperature. The second sensor group SSB is provided. The second sensor group SSB includes a sensor that measures the temperature (T), electrical conductivity (EC), and pressure (P) of seawater flowing into the second RO module 10B, and the pressure of the concentrated seawater discharged from the second RO module 10B. The sensor which measures (P) and the sensor which measures the flow volume (F), electrical conductivity (EC), and pressure (P) of the fresh water discharged | emitted from the 2nd RO module 10B are provided.

Furthermore, the seawater desalination equipment of the first and second series receives the values measured by the first sensor group SSA and the second sensor group SSB, and switches the medicine to be injected from the chemical injection pump 19. The machine 21 is shared.

Except for the above configuration, the seawater desalination apparatus of the present embodiment is the same as the seawater desalination apparatus of the seventh embodiment described above.

FIG. 9 is a diagram showing an example of a table that stores deterioration factors corresponding to changes in values measured by the first sensor group SSA and the second sensor group SSB in the injecting drug switching machine 21. “↑” in FIG. 9 indicates that the measured value has increased, and “↓” indicates that the measured value has decreased.

For example, in the case of fouling due to organic matter, the injection chemical switching machine 21 increases the RO membrane supply pressure and the permeate flow rate significantly decreases. However, the pressure loss on the concentrated water side, the electrical conduction of the supply water and permeate water, It has a table that stores characteristics such that the rate ratio does not change. The infusion medicine switching machine 21 can clarify the fouling factors occurring in each series by referring to the characteristics stored in the table.

As described above, the injecting medicine switching machine 21 identifies the deterioration factors according to the values measured by the first sensor group SSA and the second sensor group SSB, and selects the kind and amount of the medicine that eliminates these deteriorations. In such a manner, an injection chemical command is output to the medicine injection pump 19. The types and amounts of chemicals that eliminate each deterioration factor may be stored together with a table that stores deterioration factors for characteristics, or may be stored in other tables.

Thus, by providing the first sensor group SSA, the second sensor group SSB, and the injecting chemical switching machine 21, the cleaning of the RO membrane in the seawater desalination apparatus can be automated.

Since the RO module cleaning method in the present embodiment is the same as that in the seventh embodiment except for the chemical switching operation of the cleaning liquid, the description thereof is omitted here.

That is, according to the seawater desalination apparatus and the seawater desalination apparatus cleaning method of the present embodiment, the same effects as those of the seventh embodiment described above can be obtained, the initial cost can be reduced, and the manual operation of the user can be reduced. A seawater desalination apparatus and a method for cleaning a seawater desalination apparatus can be provided.

In addition, in the said embodiment, although the seawater desalination apparatus of 7th Embodiment demonstrated the structure further provided with the sensor group and the injection | pouring chemical | medical agent switch machine, the seawater desalination apparatus of 1st Embodiment thru | or 6th Embodiment was demonstrated. A similar effect can be obtained by providing the sensor group and the injection chemical switching machine.

Next, a seawater desalination apparatus and a seawater desalination apparatus cleaning method according to the ninth embodiment will be described with reference to the drawings.

FIG. 10 is a diagram schematically illustrating a configuration example of the seawater desalination apparatus according to the present embodiment.
The seawater desalination apparatus of the present embodiment has a first series of seawater desalination equipment and a second series of seawater desalination equipment.

In the present embodiment, the first water quality sensor 22A is attached in front of the first high pressure pump 8A, and the second water quality sensor 22B is attached in front of the second high pressure pump 8B. The water quality data measured by the first water quality sensor 22A and the second water quality sensor 22B include, for example, pH, alkalinity, TOC (total organic carbon), chlorophyll a for specifying the factor of the fouling substance. , Turbidity, SDI (silt density index), MFI (membrane fouling index) and the like. Water quality data measured by the water quality sensors 22 </ b> A and 22 </ b> B is transmitted to the infusion chemical switching machine 21.

The infusion chemical switching machine 21 determines the fouling state of the RO membrane based on the water quality data. Similarly to the above-described eighth embodiment, the infusion chemical switching machine 21 is capable of water quality such as fouling due to organic matter if the turbidity, SDI, MFI, etc. of the water supplied to the

RO modules

10A, 10B are increasing. A table (not shown) of deterioration factors with respect to changes in data is prepared in advance, the deterioration factors are determined with reference to the table, and the type and amount of medicine to be injected from the medicinal pump 19 are switched. Therefore, according to the seawater desalination apparatus of the present embodiment, the cleaning of the RO membrane can be automated.

That is, according to the seawater desalination apparatus and the seawater desalination apparatus cleaning method of the present embodiment, the same effects as those of the seventh embodiment described above can be obtained, and the initial cost can be reduced and the manual operation of the user can be reduced. A cleaning method for a desalination apparatus and a seawater desalination apparatus can be provided.

In addition, although the seawater desalination apparatus of 7th Embodiment demonstrated the structure further provided with the water quality sensor and the injection | pouring chemical | medical agent switching machine in the said embodiment, the seawater desalination apparatus of 1st Embodiment thru | or 6th Embodiment was demonstrated. The same effect can be obtained by providing the water quality sensor and the injection chemical switching machine.

According to the above embodiments, providing a plant configuration that can efficiently use facilities by sharing a water tank and a pump of a cleaning facility for cleaning facilities and RO membranes required for seawater desalination. Can do. In addition, it is possible to provide a seawater desalination apparatus and a seawater desalination apparatus cleaning method for automating operations regarding the identification of a fouling-causing substance and the cleaning of the RO membrane.

Although several embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.

Claims

A reverse osmosis membrane for separating seawater into fresh water and concentrated seawater;
A pretreatment water tank for storing seawater or fresh water to be sent to the reverse osmosis membrane;
A permeated water tank fed from the fresh water discharge side of the reverse osmosis membrane;
A rinsing pump that is fed from the permeate tank and feeds water to the pretreatment tank;
A washing tank provided with a stirrer and fed from the freshwater discharge side and the concentrated seawater discharge side of the reverse osmosis membrane,
A seawater desalination apparatus comprising: a cleaning pump that pumps out a cleaning liquid from the cleaning water tank and sends the water to a preceding stage of the reverse osmosis membrane; and a controller that controls operations of the water cleaning pump, the stirrer, and the cleaning pump.
A reverse osmosis membrane that separates seawater into fresh water and concentrated seawater; a pretreatment water tank that stores seawater or fresh water that is sent to the reverse osmosis membrane; and a permeate tank that is supplied from the freshwater discharge side of the reverse osmosis membrane. Multiple seawater desalination facilities,
A washing tank provided with a stirrer and fed from the freshwater discharge side and the concentrated seawater discharge side of the plurality of reverse osmosis membranes;
A cleaning pump that pumps out the cleaning liquid in the cleaning water tank and supplies water to any preceding stage of the plurality of reverse osmosis membranes;
A rinsing pump disposed between the plurality of permeated water tanks and the plurality of pretreated water tanks, supplying water from any of the plurality of permeated water tanks and feeding water to any of the pretreated water tanks,
A seawater desalination apparatus comprising: the water washing pump, a plurality of the stirrers, and a controller that controls operations of the washing pump.
A reverse osmosis membrane that separates and drains seawater into fresh water and concentrated seawater, a pretreatment water tank that has a stirrer and stores seawater or fresh water that is fed to the reverse osmosis membrane, and a permeate that feeds water from the freshwater discharge side of the reverse osmosis membrane A plurality of seawater desalination facilities comprising a water tank;
A washing pump disposed between the plurality of permeate tanks and the plurality of pretreatment water tanks, supplying water from any of the plurality of permeate tanks and feeding water to any of the plurality of pretreatment water tanks;
The seawater desalination apparatus provided with the controller which controls operation | movement with the said water washing pump, the said some agitator, and the said water washing pump.
A reverse osmosis membrane for separating and draining seawater into fresh water and concentrated seawater, a pretreatment water tank for storing seawater or fresh water to be fed to the reverse osmosis membrane, a permeate tank for supplying water from the fresh water discharge side of the reverse osmosis membrane, A plurality of seawater desalination facilities with
A washing pump disposed between the plurality of permeate tanks and the plurality of pretreatment water tanks, supplying water from any of the plurality of permeate tanks and feeding water to any of the plurality of pretreatment water tanks;
A chemical injection pump for injecting chemicals into a water supply path between the water washing pump and the plurality of pretreatment water tanks;
Agitation means disposed between a chemical injection position of the chemical injection pump and the plurality of pretreatment water tanks;
The seawater desalination apparatus provided with the controller which controls operation | movement of the said water-washing pump and the said chemical injection pump.
A reverse osmosis membrane for separating and draining seawater into fresh water and concentrated seawater, a pretreatment water tank for storing seawater or fresh water to be fed to the reverse osmosis membrane, a permeate tank for supplying water from the fresh water discharge side of the reverse osmosis membrane, A plurality of seawater desalination facilities comprising a supply pump for supplying water from the pretreatment water tank or the permeated water tank to the reverse osmosis membrane;
A chemical injection pump for injecting chemicals from a plurality of the permeate tanks to a plurality of water supply paths to the supply pumps;
Agitation means disposed between a chemical injection position of the chemical injection pump and a plurality of the supply pumps;
A seawater desalination apparatus comprising: a controller that controls operations of the supply pump and the chemical injection pump.
A reverse osmosis membrane that separates and drains seawater into fresh water and concentrated seawater, a permeate tank that supplies water from the freshwater discharge side of the reverse osmosis membrane, and a high-pressure pump that is disposed in front of the reverse osmosis membrane. Multiple seawater desalination facilities;
A chemical injection pump for injecting chemicals into the fresh water discharged from the reverse osmosis membrane;
A stirring means for stirring the fresh water into which the chemical is injected;
A controller for controlling the operation of the supply pump and the medicine pump,
The seawater desalination apparatus in which the freshwater drainage side of the plurality of reverse osmosis membranes is connected to the front stage of the plurality of high-pressure pumps by piping.
A reverse osmosis membrane that separates and drains seawater into fresh water and concentrated seawater, a permeate tank that supplies water from the freshwater discharge side of the reverse osmosis membrane, and a high-pressure pump that is disposed in front of the reverse osmosis membrane. Multiple seawater desalination facilities;
A chemical injection pump for injecting chemicals into the fresh water discharged from the reverse osmosis membrane;
A stirring means for stirring the fresh water into which the chemical has been injected;
A controller for controlling the operation of the supply pump and the medicine pump,
The seawater desalination apparatus in which the freshwater drainage side of the plurality of reverse osmosis membranes is connected to the latter stage of the plurality of high-pressure pumps by piping.
Sensor group for measuring supply pressure, concentrated water side and permeate side pressure, permeate flow rate, change in electrical conductivity of feed water and permeate, and water temperature for the reverse osmosis membrane;
The value measured by the sensor group is received, the deterioration factor for the change in the measured value is stored, the deterioration factor of the reverse osmosis membrane is determined, and an infusion chemical command is sent to the drug injection pump. The seawater desalination apparatus according to any one of claims 1 to 7, further comprising an injection chemical switching machine for transmission.
A water quality sensor for measuring water quality data of seawater supplied to the reverse osmosis membrane;
An injection chemical switching machine that receives the water quality data, uses the table storing the deterioration factors for the water quality data, determines the deterioration factor of the reverse osmosis membrane, and transmits an injection chemical command to the chemical injection pump. The seawater desalination apparatus according to any one of claims 1 to 7, further comprising:
A reverse osmosis membrane for separating and draining seawater into fresh water and concentrated seawater, a pretreatment water tank for storing seawater or fresh water to be fed to the reverse osmosis membrane, a permeate tank for supplying water from the fresh water discharge side of the reverse osmosis membrane, A method for cleaning a seawater desalination apparatus comprising a plurality of seawater desalination facilities comprising:
Operate a water washing pump disposed between the plurality of permeated water tanks and the plurality of pretreated water tanks, supply water from any of the plurality of permeated water tanks, and supply water to any of the plurality of pretreated water tanks,
A chemical injection pump is operated to inject chemicals into a water supply path between the water washing pump and the plurality of pretreatment water tanks,
The chemical is stirred by a stirring means disposed between the chemical injection position of the chemical injection pump and a plurality of the pretreatment water tanks, the cleaning liquid is purified and stored in the pretreatment water tank,
Operate a supply pump disposed downstream of the pretreatment water tank and upstream of the reverse osmosis membrane to pump out a cleaning liquid from the pretreatment water tank and send it to the reverse osmosis membrane. Circulate the cleaning liquid between the treatment water tank and
Stop the supply pump and immerse the reverse osmosis membrane in a cleaning solution,
A washing method for a seawater desalination apparatus, wherein the washing pump is operated to draw fresh water from any of the plurality of permeated water tanks, feed water to the pretreatment water tank, and wash the pretreatment water tank to the reverse osmosis membrane.