WO2012115114A1 - Seawater desalination system and seawater desalination method - Google Patents

Seawater desalination system and seawater desalination method Download PDF

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Publication number
WO2012115114A1
WO2012115114A1 PCT/JP2012/054160 JP2012054160W WO2012115114A1 WO 2012115114 A1 WO2012115114 A1 WO 2012115114A1 JP 2012054160 W JP2012054160 W JP 2012054160W WO 2012115114 A1 WO2012115114 A1 WO 2012115114A1
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WIPO (PCT)
Prior art keywords
seawater
water
reverse osmosis
osmosis membrane
permeated
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PCT/JP2012/054160
Other languages
French (fr)
Japanese (ja)
Inventor
雄介 大川
光太郎 北村
能登　一彦
Original Assignee
株式会社日立プラントテクノロジー
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Application filed by 株式会社日立プラントテクノロジー filed Critical 株式会社日立プラントテクノロジー
Priority to SG2013063607A priority Critical patent/SG192894A1/en
Priority to CN2012800095918A priority patent/CN103443031A/en
Publication of WO2012115114A1 publication Critical patent/WO2012115114A1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
    • B01D61/02—Reverse osmosis; Hyperfiltration ; Nanofiltration
    • B01D61/12—Controlling or regulating
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
    • C02F1/441—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by reverse osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/05—Conductivity or salinity
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/10—Energy recovery
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A20/00—Water conservation; Efficient water supply; Efficient water use
    • Y02A20/124—Water desalination
    • Y02A20/131—Reverse-osmosis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies

Definitions

  • the present invention relates to a seawater desalination system and a seawater desalination method.
  • sea water desalination apparatus which produces
  • the first treatment unit that separates the sewage having a salt concentration lower than that of seawater by membrane separation and separates it into permeate water and concentrated water, and the concentrated water generated in the first treatment unit are mixed with seawater for dilution and mixed
  • a seawater desalination system comprising: a second processing unit that treats the mixed water as membrane water and separates the mixed water into permeate water and concentrated water, and controls the first processing unit and the second processing unit based on the inflow of sewage Has been proposed (see Patent Document 1).
  • the salinity concentration of the mixed water can be reduced by subjecting the mixed water obtained by mixing the concentrated water of the sewage to the seawater to a membrane separation process.
  • the energy for producing fresh water can be reduced as compared to the case where seawater is subjected to membrane separation treatment.
  • Patent No. 4499835 gazette
  • An object of the present invention is to provide a seawater desalination system capable of reducing the energy for producing fresh water and securing the water quality of the produced fresh water.
  • a sewerage system reverse osmosis membrane treatment means for producing sewerage permeated water and sewerage water concentrate by membrane separation treatment of sewage, and a separation treatment of mixed water of the sewerage water and the sewerage concentrated water.
  • a seawater system reverse osmosis membrane treatment unit having a salinity concentration measurement unit that generates a seawater system permeated water and a seawater system concentrated water and measures a salinity concentration of the seawater system permeated water;
  • a seawater desalination system characterized in that the seawater system permeated water is supplied to the sewer system reverse osmosis membrane treatment means according to the salinity concentration of the seawater system permeated water measured by means.
  • the lower water system reverse osmosis membrane treatment means generates lower water system permeate water and lower water system concentrated water by subjecting the sewage to membrane separation treatment.
  • the seawater system reverse osmosis membrane treatment means produces a seawater system permeated water and a seawater system concentrate by membrane separation treatment of the mixed water of the lower water system concentrated water and the taken seawater, and the salt concentration of the seawater system permeated water is determined. It has a means to measure salinity.
  • the seawater system permeated water is supplied to the lower water system reverse osmosis membrane treatment means according to the salinity concentration of the seawater system permeated water.
  • the seawater-based reverse osmosis membrane treatment means the mixed water of the lower concentrated water and seawater mixed with seawater having a lower salinity concentration than the seawater is subjected to membrane separation treatment to generate seawater-based permeate water, which is fresh water.
  • the energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of high seawater.
  • the amount of sewage decreases and the amounts of the lower system permeated water and the lower system concentrated water produced by the lower system reverse osmosis membrane processing means decrease and the salt concentration of the seawater-based permeate increases.
  • seawater-based permeated water whose salt concentration is a predetermined reference value by subjecting seawater-based permeated water having an increased salinity concentration to a membrane separation treatment using the lower water system reverse osmosis membrane treatment means whose operating rate has decreased Can be secured. Therefore, while being able to reduce the energy for producing fresh water, the seawater desalination system which can secure the water quality in the fresh water to produce can be provided.
  • a seawater desalination system having a sewerage system reverse osmosis membrane treatment means for producing sewerage permeated water and sewerage water concentrate by membrane separation treatment of sewage, wherein seawater collected with the sewerage water is taken.
  • Seawater-based reverse osmosis membrane treatment means having a salinity concentration measurement means for producing seawater-based permeated water and seawater-based concentrated water by subjecting the mixed water to membrane separation treatment, and measuring the salinity concentration of the seawater-based permeated water;
  • controlling means for controlling driving of the lower water system reverse osmosis membrane processing means and the sea water type reverse osmosis membrane processing means according to the salinity concentration of the seawater system permeated water measured by the salinity concentration measuring means.
  • the lower water system reverse osmosis membrane treatment means produces lower water system permeate water and lower water system concentrated water by subjecting the sewage to membrane separation treatment.
  • the seawater system reverse osmosis membrane treatment means produces a seawater system permeated water and a seawater system concentrate by membrane separation treatment of mixed water of the lower water system concentrated water and the seawater, and measures the salinity concentration of this seawater system permeated water Means for measuring salinity.
  • the control means controls the lower water system reverse osmosis membrane treatment means and the sea water based reverse osmosis membrane treatment means according to the salt concentration of the seawater system permeated water.
  • the seawater-based reverse osmosis membrane treatment means the mixed water of the lower concentrated water and seawater mixed with seawater having a lower salinity concentration than the seawater is subjected to membrane separation treatment to generate seawater-based permeate water, which is fresh water.
  • the energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of high seawater.
  • the lower water system reverse osmosis membrane treatment means and the sea water system reverse osmosis membrane treatment means are controlled according to the salt concentration of the generated seawater freshwater permeated water, for example, the salt concentration of the seawater based permeate water is predetermined.
  • the driving of the seawater-based reverse osmosis membrane processing means can be suppressed and the salt concentration of the seawater-based permeate can be returned to the predetermined reference value. Therefore, while being able to reduce the energy for producing fresh water, the seawater desalination system which can secure the water quality in the fresh water to produce can be provided.
  • the system further comprises a second seawater system reverse osmosis membrane processing means for subjecting the seawater system permeate water to membrane separation treatment, and the control means is adapted to the salinity concentration of the seawater system permeate water measured by the salinity concentration measurement means.
  • the seawater desalination system according to (2) wherein the seawater system permeated water is supplied to the second seawater system reverse osmosis membrane processing means.
  • the system further comprises a second seawater system reverse osmosis membrane treatment means for subjecting seawater system permeated water to membrane separation treatment.
  • a second seawater system reverse osmosis membrane treatment means for subjecting seawater system permeated water to membrane separation treatment.
  • the control means supplies the seawater-based permeated water to the lower water system reverse osmosis membrane treatment means according to the salt concentration of the seawater-based permeate measured by the salt concentration measurement means, and the lower water system reverse osmosis (2)
  • the seawater-based permeated water is subjected to the membrane separation treatment by the lower water system reverse osmosis membrane treatment means according to the salt concentration of the seawater-based permeated water.
  • the amount of sewage decreases, and the amounts of the water in the lower water system permeate and the lower water system concentrated water generated by the lower water system reverse osmosis membrane treatment means decrease, and the salinity concentration in the seawater system water increases.
  • the seawater system permeated water in which the salinity concentration has risen is subjected to the membrane separation treatment using the lower water system reverse osmosis membrane processing means whose operating rate has decreased, the seawater system permeation whose salinity concentration is a predetermined reference value It can supply water.
  • the reverse osmosis membrane included in the seawater-based reverse osmosis membrane treatment means is an inflow amount and a salinity concentration of the sewage flowing into the lower water system reverse osmosis membrane treatment means, and the seawater flowing into the seawater-based reverse osmosis membrane treatment means It is characterized by being a reverse osmosis membrane with a suitable demineralization rate, which is selected based on the inflow amount and the salinity concentration, the water amount and salinity concentration of the seawater system permeated water generated by the seawater system reverse osmosis membrane treatment means set in advance.
  • the seawater desalination system according to any one of (2) to (4).
  • reverse osmosis membrane there are various membranes having a desalting rate of about 55% to about 99%.
  • the higher the desalting rate of the reverse osmosis membrane the higher the capacity of the lift and the more the pump requiring more energy is required.
  • a reverse osmosis membrane with a suitable desalting rate it is possible to use a pump with a suitable energy efficiency, and energy for producing fresh water can be further reduced.
  • a reverse osmosis reverse osmosis membrane treatment means that produces lower permeate permeate water and lower intake water concentrate by membrane separation treatment of sewage, and seawater permeate permeate water and seawater concentrate by treating membrane water with membrane separation treatment
  • a storage tank for storing mixed permeated water in which the permeated water from the lower water system and the seawater based permeated water are mixed, and a water level of the mixed permeated water stored in the storage tank.
  • a storage system having a water level gauge for measuring the sea water freshwater characterized in that the storage system starts or stops the seawater system reverse osmosis membrane processing means in accordance with the water level measured by the water level gauge.
  • the lower water system reverse osmosis membrane treatment means produces lower water system permeate water and lower water system concentrated water by subjecting the sewage to membrane separation treatment.
  • a seawater system reverse osmosis membrane processing means produces seawater system permeated water and seawater system concentrated water by carrying out the membrane separation process of seawater.
  • the storage system has a storage tank for storing mixed permeated water in which the lower water system permeated water and the seawater-based permeated water are mixed, and a water level gauge for measuring the water level of the mixed permeated water stored in the storage tank. And a storage system starts or stops a seawater system reverse osmosis membrane process means according to the water level of the mixed permeated water measured with the water level gauge.
  • the seawater-based reverse osmosis membrane treatment means the mixed water of the lower concentrated water and seawater mixed with seawater having a lower salinity concentration than the seawater is subjected to membrane separation treatment to generate seawater-based permeate water, which is fresh water.
  • the energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of high seawater.
  • the seawater-based reverse osmosis membrane treatment means is activated or stopped according to the water level in the storage tank of the mixed permeated water in which the generated fresh water in the lower water system permeated water and the seawater-based permeated water are mixed, for example, When the water-system permeated water is produced sufficiently and the desired amount of water can be secured, the seawater-based reverse osmosis membrane treatment means which requires more energy than the lower water-system reverse osmosis membrane treatment means can be stopped. Therefore, it is possible to provide a seawater desalination system capable of reducing the energy for producing fresh water and securing a desired amount of produced fresh water.
  • the storage system has a first salinity concentration measurement means for measuring the salinity concentration of the mixed permeated water stored in the storage tank, and the lower water system reverse osmosis membrane treatment means comprises the generated lower water system permeation It has a second salinity concentration measuring means for measuring the salinity concentration of water, and the seawater system reverse osmosis membrane processing means has a third salinity concentration measuring means for measuring the salinity concentration of the generated seawater system permeated water.
  • the seawater desalination system according to (6) wherein the seawater desalination system according to (6) is activated or stopped according to the salinity concentration of the seawater-based permeate, the salinity concentration of the lower-system permeated water, and the salinity concentration of the mixed permeate.
  • the seawater-based reverse osmosis membrane treatment means is started or stopped depending on the salt concentration of the seawater-based permeate, the salt concentration of the lower water-system permeate, and the salt concentration of the mixed permeate. For example, if either the salinity concentration of the permeated water in the lower water system or the salinity concentration of the mixed permeated water is higher than a predetermined reference value, stopping the seawater-based reverse osmosis membrane treatment means will result in the mixed permeated water being the generated fresh water.
  • the salinity concentration can be returned to within a predetermined reference value. Therefore, while being able to reduce the energy for producing fresh water, the seawater desalination system which can secure the water quality in the fresh water to produce can be provided.
  • a process of reverse osmosis reverse osmosis membrane treatment that produces a permeated water of the lower water system and a concentrated water of lower water system by membrane separation treatment of sewage, and the mixed water of the lower concentrated water and the taken seawater is subjected to membrane separation treatment
  • a seawater system reverse osmosis membrane treatment process which produces seawater system permeated water and seawater system concentrated water, a salinity concentration measurement process which measures salinity concentration of the seawater system permeated water, salinity concentration of the seawater system permeated water
  • a seawater system permeated water circulation process for returning the seawater system permeated water to the sewer system reverse osmosis membrane treatment process according to the above.
  • a seawater desalination method comprising a lower water system reverse osmosis membrane treatment step of producing a lower water system permeate water and a lower water system concentrated water by membrane separation treatment of sewage, wherein the lower water system concentrated water and the seawater withdrawn
  • a seawater-based reverse osmosis membrane treatment step of producing seawater-based permeated water and seawater-based concentrated water by subjecting mixed water to membrane separation treatment, and a salt concentration measurement step of measuring the salinity concentration of the seawater-based permeated water
  • a seawater desalination method comprising: a continuation determination step of determining continuation of the lower water system reverse osmosis membrane treatment step and the seawater type reverse osmosis membrane treatment step according to the salinity concentration of the seawater system permeated water . According to the invention of (9), the same function and effect as the invention of (2) can be obtained.
  • the method further comprises a second seawater system reverse osmosis membrane treatment step of subjecting the seawater system permeate water to membrane separation treatment, and the seawater system permeation according to the salinity concentration of the seawater system permeate water measured in the salinity concentration measurement step.
  • the same function and effect as the invention of (3) are exerted.
  • a seawater system permeated water circulation process for returning the seawater system permeated water to the downstream water system reverse osmosis membrane treatment process according to the salinity concentration of the seawater system permeated water measured in the salinity concentration measurement process In the water-based reverse osmosis membrane treatment step, the seawater separation method according to (9) is characterized in that the mixed water of the seawater-based permeated water and the sewage returned in the seawater-based permeated water circulation step is subjected to a membrane separation treatment. According to the invention of (11), the same function and effect as the invention of (4) can be obtained.
  • a reverse osmosis reverse osmosis membrane treatment process that generates lower permeate permeate and lower concentrate drainage by membrane separation treatment of sewage, and seawater permeate and seawater concentrate by membrane separation treatment of seawater
  • the seawater desalination method as described in. According to the invention of (13), the same function and effect as the invention of (7) are exerted.
  • FIG. 1 is a schematic block diagram which shows the seawater desalination system 1A of 1st Embodiment of this invention.
  • the seawater desalination system 1A includes the lower water system reverse osmosis membrane processing means 10A, the seawater system reverse osmosis membrane processing means 20A, and the control means 100A, and It is an apparatus which carries out the membrane separation process of W10 and seawater W20, and generates lower water system permeated water W11 and seawater system permeated water W21 which are freshwater.
  • the seawater W20 in the present specification is water present in the sea, a lake, a swamp, a pond or the like, and is a water having a salt concentration of about 1.0% by mass or more and about 4.0% by mass or less.
  • the sewage W10 in the present specification is an organic wastewater containing organic matter, inorganic wastewater such as in a manufacturing plant, and the like, which is drained after being subjected to a filtration process and the like, and has a salinity concentration lower than that of seawater W20. It is.
  • fresh water in the present specification is water having a low salt concentration.
  • the seawater desalination system 1A is a reverse water system reverse osmosis membrane treatment means 10A that generates the lower water system permeate water W11 and the lower water system concentrated water W12 by subjecting the sewage W10 to membrane separation treatment, and the seawater taken with the lower water system concentrated water W12.
  • a conductivity meter (hereinafter referred to as an EC meter) that produces seawater-based permeate water W21 and seawater-based concentrated water W22 by performing membrane separation processing of mixed water with W20, and measures the salinity concentration of this seawater-based permeate water W21
  • the seawater desalination system 1A allows the seawater-based permeate water W21 to flow out to the supply system if the salt concentration of the seawater-based permeate water W21 satisfies the standard that can flow out to the supply system (not shown) using the permeate water. When it does not satisfy the standard which can flow out to the system, the seawater system permeated water W21 is circulated to the lower water system reverse osmosis membrane treatment means 10A.
  • each configuration of the seawater desalination system 1A will be described in detail.
  • the lower water system reverse osmosis membrane treatment means 10A is provided in the sewage line L10 for supplying the sewage W10 from outside the system and the sewage line L10, and the lower water system pretreatment module 11 for filtering sludge contained in the sewage W10, and the sewage line L10.
  • the "line” as used in this specification is a line which can distribute
  • the sewage line L10 extends from outside the seawater desalination system 1A and is connected to the lower water system reverse osmosis membrane module 12 via the lower water system pretreatment module 11, and the sludge is removed by the lower water system pretreatment module 11.
  • the sewage W 10 is introduced into the lower water system reverse osmosis membrane module 12.
  • the lower water system pretreatment module 11 is provided upstream of the lower water system reverse osmosis membrane module 12 in the sewage line L10, and filters and removes the sludge contained in the sewage W10 by the membrane separation activated sludge method.
  • the lower water system pretreatment module 11 includes a microfiltration membrane or an ultrafiltration membrane (not shown) as a filtration medium.
  • the microfiltration membrane or the ultrafiltration membrane is used in the lower water system pretreatment module 11, the present invention is not limited to this, and another filtration device for removing sludge contained in the sewage W10 may be used. You can also.
  • the lower water system reverse osmosis membrane module 12 is connected to the downstream end of the sewage line L10.
  • the lower water system reverse osmosis membrane module 12 performs the membrane separation process of the sewage W10 from which the sludge has been removed by the lower water system pretreatment module 11 with a reverse osmosis membrane (hereinafter also referred to as “RO membrane”).
  • RO membrane reverse osmosis membrane
  • An aqueous concentrated water W12 is produced.
  • the lower water system reverse osmosis membrane module 12 includes one or more RO membrane elements (not shown), and these RO membrane elements remove dissolved salts in water.
  • a membrane having a suitable desalting rate is selected based on the inflow and salinity of the sewage W10 flowing into the lower water system reverse osmosis membrane treatment means 10A.
  • the pressurization pump 13 is provided in the sewage line L10, pressurizes the sewage W10, and sends it to the lower water system reverse osmosis membrane module 12.
  • the lower water system permeated water line L11A and the lower water system concentrated water line L12 are connected to the downstream side of the lower water system reverse osmosis membrane module 12.
  • the lower water system permeated water line L11A is a line through which the lower water system permeated water W11 having permeated through the RO membrane flows and drains the lower water system permeated water W11 out of the system.
  • the lower water system concentrated water line L12 is a line through which the lower water system concentrated water W12 which has not permeated the RO membrane flows.
  • the lower water system concentrated water line L12 is connected to the seawater-based reverse osmosis membrane treatment means 20, and supplies the lower water system concentrated water W12 to the seawater-based reverse osmosis membrane treatment means 20.
  • the seawater system reverse osmosis membrane treatment means 20A is provided to a seawater line L20A supplying seawater W20 from outside the system and a seawater line L20A, and suspended bacteria etc. contained in seawater W20 (hereinafter referred to as “bacteria, virus, SS (suspended matter And so on) seawater filtration module 21 such as sand filtration or VF (ultrafiltration membrane), and seawater line L20A, and the seawater W20 is subjected to membrane separation treatment, seawater system permeate water W21 and The seawater system reverse osmosis membrane module 22 for producing the seawater system concentrated water W22, the pressurizing pump 23 provided on the upstream side of the seawater system reverse osmosis membrane module 22 in the seawater line L20A, and the seawater system reverse osmosis membrane module 22 The seawater system permeated water line L21A connected, the seawater system concentrated water line L22 connected to the seawater system reverse osmosis membrane module 22, and the seawater
  • the seawater line L20A extends from outside the seawater desalination system 1A and is connected to the seawater-based reverse osmosis membrane module 22 via the seawater-based pretreatment module 21.
  • the seawater line L20A is connected to the lower concentrated water line L12 at the lower concentrated water line connection point J12 between the seawater system pretreatment module 21 and the seawater reverse osmosis membrane module 22.
  • the pressurizing pump 23 is provided in the seawater line L20A, and seawater W20 from which bacteria, SS and the like have been removed by the seawater system pretreatment module 21 and lower water system concentrated water W12 supplied from the lower water system reverse osmosis membrane processing means 10A.
  • the mixed water with the above is pressurized and delivered to the seawater-based reverse osmosis membrane module 22.
  • the seawater system pretreatment module 21 is provided upstream of the seawater-based reverse osmosis membrane module 22 in the seawater line L20A, and filters and removes bacteria, viruses, SS and the like contained in the seawater W20 by the membrane separation process.
  • the seawater-based pretreatment module 21 filters the seawater W 20 by sand, and then performs membrane separation treatment using an ultrafiltration membrane (not shown).
  • the seawater-based pretreatment module 21 uses an ultrafiltration membrane, but the present invention is not limited to this, and other components such as microfiltration membranes for removing bacteria, SS and virus SS contained in seawater W20 Filter membranes can also be used.
  • the seawater system reverse osmosis membrane module 22 is connected to the downstream side of the seawater line L20A.
  • the seawater system reverse osmosis membrane module 22 is a mixed water of seawater W 20 from which bacteria, viruses, SS and the like have been removed by the seawater system pretreatment module 21 and the sewage system concentrated water W12 supplied from the sewerage reverse osmosis membrane processing means 10.
  • the seawater system reverse osmosis membrane module 22 includes one or more RO membrane elements (not shown), and these RO membrane elements remove dissolved salts in water.
  • the RO membrane element is the inflow amount and salinity concentration of the seawater W 20 flowing into the seawater system reverse osmosis membrane processing means 20, the water volume and salinity of the seawater system permeated water W 21 generated by the seawater system reverse osmosis membrane processing means 20 set in advance.
  • a membrane with a suitable desalting rate is selected based on the concentration.
  • the seawater system permeated water line L ⁇ b> 21 ⁇ / b> A and the seawater system concentrated water line L ⁇ b> 22 are connected to the downstream side of the seawater system reverse osmosis membrane module 22.
  • the seawater system permeated water line L21A is a line through which the seawater-based permeated water W21 having permeated through the RO membrane flows.
  • a seawater-based salt concentration measurement line L23 and a seawater-based permeated water drainage line L24 are connected to the seawater system permeated water line L21A in this order from the upstream side.
  • a seawater system permeated water circulation valve 250 is provided at the downstream end.
  • the seawater system permeated water line L21A is connected to the seawater system permeated water circulation line L25 via the seawater system permeated water circulation valve 250, and circulates the seawater system permeated water W21 to the lower water system reverse osmosis membrane treatment means 10A.
  • the seawater system concentrated water line L22 is a line through which the seawater-based concentrated water W22 which has not permeated the RO membrane flows, and which drains the seawater-based concentrated water W22 out of the system.
  • the seawater system salinity measurement line L23 branches from the seawater system permeated water line L21 at the salinity measurement line branch point J23, and the seawater system permeated water W21 flows, and the seawater system permeated water EC meter 230 as a salinity concentration measuring means It is connected.
  • the seawater system permeated water EC meter 230 measures the conductivity of the seawater-based permeate water W21 flowing through the seawater-based salt concentration measurement line L23 as a salinity concentration measurement step, and converts it to a salinity concentration.
  • the seawater system permeated water EC meter 230 is connected to the control means 100A, and transmits the measured conductivity or converted salt concentration of the seawater system permeate water W21 to the control means 100A.
  • the seawater system permeated water drainage line L24 branches from the seawater system permeated water line L21 at the seawater system permeated water drainage line branch point J24, and the seawater system permeated water W21 is supplied through the seawater system permeated water drainage valve 240 (shown in FIG. It is a line that flows out to
  • the seawater system permeated water drainage valve 240 is composed of a solenoid valve or a motorized valve, and under the control of the control means 100A, the seawater system permeated water W21 if the salt concentration of the seawater system permeated water W21 satisfies the standard that can flow out to the supply system.
  • the seawater system permeated water circulation line L25 extends from the seawater system permeated water circulation valve 250 and is connected to the seawater system permeated water circulation line connection point J25 of the sewage line L10.
  • the seawater system permeated water circulation line L25 is a line for circulating the seawater-based permeated water W21 to the lower water system reverse osmosis membrane treatment means 10A.
  • the seawater system permeated water circulation valve 250 is composed of a solenoid valve or a motorized valve, and under the control of the control means 100A, the seawater system permeated if the salt concentration of the seawater system permeated water W21 satisfies the standard that can flow out to the supply system (not shown).
  • the system is configured not to circulate the water W21 to the lower water system reverse osmosis membrane processing means 10A, and when the salt concentration of the seawater system permeate water W21 does not satisfy the standard that can flow out to the supply system, It is configured to be circulated to the osmotic membrane processing means 10A.
  • the control means 100A is electrically connected to an element to be controlled among the elements constituting the seawater desalination system 1A. Specifically, the control unit 100A is configured to apply the pressure pump 13, the pressure pump 23, the seawater permeated water drain valve 240, and the like according to the salinity concentration of the seawater permeated water W21 measured by the seawater permeated water EC meter 230. The seawater system permeated water circulation valve 250 is controlled.
  • the control unit 100A performs control to drive the pressure pump 13 and the pressure pump 23.
  • the lower water system reverse osmosis membrane treatment means 10A is driven, and the sewage W10 supplied from outside the system and from which the sludge is removed by the lower water system pretreatment module 11 is introduced to the lower water system reverse osmosis membrane module 12.
  • the sewage W10 introduced into the lower water system reverse osmosis membrane module 12 is subjected to a membrane separation treatment to generate lower water system permeate water W11 and lower water system concentrated water W12.
  • the lower water system permeate water W11 is drained to the outside of the system, and the lower water system concentrated water W12 is supplied to the seawater-based reverse osmosis membrane treatment means 20A.
  • seawater W20 driven by the seawater-based reverse osmosis membrane treatment means 20A and supplied from outside the system and from which bacteria, viruses, SS and the like have been removed by the seawater-based pretreatment module 21 is supplied from the lower water system reverse osmosis membrane treatment means 10A.
  • the resultant mixture is mixed with the lower water system concentrated water W12 and introduced into the seawater-based reverse osmosis membrane module 22.
  • the mixed water of the seawater W20 and the lower concentrated water W12 introduced into the seawater system reverse osmosis membrane module 22 is subjected to membrane separation treatment to generate a seawater-based permeate water W21 and a seawater-based concentrated water W22.
  • the seawater system permeate water W21 flows out to the seawater system permeate water line L21A, and the seawater system concentrated water W22 is drained out of the system.
  • the seawater-based permeated water EC meter 230 measures the salinity concentration of the seawater-based permeated water W21 that has flowed out to the seawater-based permeated water line L21A, and transmits it to the control means 100.
  • the control means 100A performs the following processing as a continuation determination step.
  • the control means 100A controls the seawater-based permeated water drainage valve 240 Is controlled to close the seawater system permeated water circulation valve 250.
  • the seawater-based permeated water W21 flows out to the supply system.
  • the control means 100A performs the seawater-based permeated water circulation process as the seawater-based permeated water circulation process.
  • the permeated water circulation valve 250 is opened, the seawater system permeated water drain valve 240 is closed, and the output of the pressurizing pump 23 is reduced to control the flow rate to be reduced.
  • seawater system permeated water W21 is circulated to the sewer system reverse osmosis membrane treatment means 10A via the seawater system permeate water circulation line L25, and again the seawater system reverse osmosis membrane treatment means 10A and the seawater system reverse osmosis membrane treatment means Membrane separation treatment is carried out by 20A.
  • the amount of intake of seawater W 20 in seawater system reverse osmosis membrane processing means 20 is reduced.
  • the seawater desalination system 1A of the first embodiment the following effects can be obtained.
  • the mixed water of the lower concentrated water W12 and the seawater W20 having a lower salinity concentration than the seawater W20 is subjected to membrane separation treatment to generate the seawater system permeate water W21 which is fresh water.
  • the energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of seawater W20 having a high concentration.
  • the water amount of the sewage W10 decreases, and the water amounts of the lower water system permeate water W11 and the lower water system concentrated water W12 generated by the lower water system reverse osmosis membrane treatment means 10A decrease, and the salinity concentration of the seawater system permeate water W21 increases.
  • the salt water concentration of the predetermined concentration can be obtained by subjecting the seawater-based permeate water W21 having the increased salinity concentration to membrane separation treatment. Seawater system permeate water W21 can be supplied. Therefore, while being able to reduce the energy for producing fresh water, seawater desalination system 1A which can secure water quality in the fresh water to produce can be provided.
  • the lower water system reverse osmosis membrane processing means 10A and the sea water type reverse osmosis membrane processing means 20A are controlled according to the salinity concentration of the generated freshwater seawater system permeate water W21, for example, the salinity of the seawater system permeate water W21
  • the concentration does not satisfy the standard that can flow out to the supply system, it is possible to suppress the driving of the seawater system reverse osmosis membrane treatment means 20A and restore the salt concentration of the seawater system permeate water W21 to a predetermined concentration.
  • the inflow and salinity concentration of the lower water system reverse osmosis membrane processing means 10A and the seawater system reverse osmosis membrane processing means 20A, the water volume and salinity of the seawater system permeated water W21 generated by the seawater system reverse osmosis membrane processing means 20A set in advance.
  • FIG. 2 is a schematic block diagram which shows the seawater desalination system 1B of 2nd Embodiment of this invention.
  • the seawater desalination system 1B of the second embodiment differs from the seawater desalination system 1A of the first embodiment in the configurations of a seawater line, a seawater system permeated water line, and a control means of the seawater system reverse osmosis membrane treatment means.
  • the seawater desalination system 1B of 2nd Embodiment is provided with the 2nd seawater system reverse osmosis membrane process means 30 which the seawater desalination system 1A of 1st Embodiment does not have.
  • the seawater desalination system 1B causes the seawater-based permeate water W21 to flow out to the supply system when the salt concentration of the seawater-based permeate water W21 satisfies the standard that can flow out to the supply system (not shown), and then flows out to the supply system. If it does not satisfy the criterion, the seawater-based permeated water W21 is further subjected to the membrane separation treatment in the second seawater-based reverse osmosis membrane treatment means 30.
  • the seawater line L20B of the seawater system reverse osmosis membrane treatment means (first seawater system reverse osmosis membrane treatment means) 20B extends from outside the seawater desalination system 1B and passes the seawater system pretreatment module 21 to the seawater system reverse osmosis membrane
  • the module (first seawater system reverse osmosis membrane module) 22 is connected.
  • the lower water system concentrated water line L12 is connected to the seawater line L20B at the lower water system concentrated water line connection point J12 between the seawater system pretreatment module 21 and the seawater system reverse osmosis membrane module 22, and the lower water system concentrated water line A seawater system reconcentrated water line L32 is connected at a seawater system reconcentrated water line junction point J32 between the connection point J12 and the seawater system reverse osmosis membrane module 22.
  • the seawater system permeated water line L21B of the seawater system reverse osmosis membrane treatment means 20B is connected to the downstream side of the seawater system reverse osmosis membrane module 22.
  • the seawater system permeated water line L21B is a line through which the seawater-based permeated water W21 having permeated through the RO membrane flows.
  • a seawater-based salt concentration measurement line L23 and a seawater-based permeated water drainage line L24 are connected to the seawater system permeated water line L21B in this order from the upstream side.
  • a seawater system valve 210 is provided at the downstream end of the seawater system permeated water line L21B.
  • the seawater system permeated water line L21B is connected to the second seawater system reverse osmosis membrane treatment means 30 via the seawater system valve 210, and supplies the seawater system permeated water W21 to the second seawater system reverse osmosis membrane treatment means 30.
  • the seawater system valve 210 is composed of a solenoid valve or a motorized valve, and under the control of the control means 100B, when the salt concentration of the seawater system permeate water W21 does not satisfy the standard that can flow out to the supply system, the seawater system permeate water W21 is used.
  • the system is configured to be supplied to the second seawater-based reverse osmosis membrane processing means 30, and the seawater-based permeated water W21 is supplied to the supply system when the salt concentration of the seawater-based permeate water W21 satisfies the standard that can flow out to the supply system. It is configured to drain.
  • the second seawater system reverse osmosis membrane processing means 30 is connected to the seawater system permeate water supply line L30 for supplying the seawater system permeate water W21 from the seawater system reverse osmosis membrane process means 20B, and is connected to the seawater system permeate water supply line L30
  • the second seawater system reverse osmosis membrane module 32 which further performs membrane separation treatment of the system permeate water W21 to generate seawater system repermeate water W31 and seawater system reconcentrated water W32, and in the seawater system permeate water supply line L30, second seawater A pressurized pump 33 provided on the upstream side of the reverse osmosis membrane module 32, a seawater system repermeate water line L31 connected to the second seawater system reverse osmosis module 32, and a second seawater system reverse osmosis membrane module 32 And a seawater system reconcentrated water line L 32 connected to
  • the seawater system permeated water supply line L30 extends from the seawater system valve 210 of the seawater system reverse osmosis membrane processing means 20B and is connected to the second seawater system reverse osmosis membrane module 32, and the seawater system permeated water W21 It is introduced into the osmotic membrane module 32.
  • the second seawater-based reverse osmosis membrane module 32 is connected to the downstream side of the seawater-based permeated water supply line L30.
  • the 2nd seawater system reverse osmosis membrane module 32 carries out the membrane separation treatment of seawater system permeated water W21 whose salinity concentration exceeds a predetermined standard value with a reverse osmosis membrane, and seawater system repermeate water W31 and seawater system reconcentrated water W32 Generate
  • the second seawater-based reverse osmosis membrane module 32 includes one or more RO membrane elements (not shown), and these RO membrane elements remove dissolved salts in water.
  • the RO membrane element is an inflow amount and salinity concentration of the seawater system permeated water W21 flowing into the second seawater system reverse osmosis membrane processing means 30, and a seawater system generated by the second seawater system reverse osmosis membrane processing means 30 set in advance.
  • a membrane having a suitable desalting rate is selected based on the amount of water and the salinity concentration of the repermeated water W31.
  • the pressurizing pump 33 is provided in the seawater-based permeated water supply line L30, pressurizes the seawater-based permeated water W21, and sends it to the second seawater-based reverse osmosis membrane module 32.
  • the seawater system repermeate water line L31 and the seawater system reconcentrated water line L32 are connected to the downstream side of the second seawater system reverse osmosis membrane module 32.
  • the seawater system repermeate water line L31 is a line through which the seawater system repermeate water W31 which has permeated the RO membrane flows and which flows out to the supply system (not shown).
  • the seawater system reconcentrated water line L32 is a line through which the seawater reconcentrated water W32 which has not permeated the RO membrane flows.
  • the seawater system reconcentrated water line L32 is connected to the seawater system reverse osmosis membrane processing means 20B, and supplies the seawater system reconcentrated membrane processing means 20B with the seawater system reconcentrated water W32.
  • the control means 100B is electrically connected to an element to be controlled among the elements constituting the seawater desalination system 1B.
  • the control unit 100B is configured to apply the pressure pump 13, the pressure pump 23, the pressure pump 33, and the seawater valve in accordance with the salinity concentration of the seawater system permeated water W21 measured by the seawater system permeated water EC meter 230. 210 and the seawater system permeated water drainage valve 240 are controlled.
  • the operation of the seawater desalination system 1B until the lower water system permeate water W11 and the seawater system permeate water W21 are generated is the same as that of the seawater desalination system 1A of the first embodiment, and thus the description thereof is omitted.
  • the seawater system permeated water EC meter 230 measures the salinity concentration of the seawater system permeated water W21 flowed out to the seawater system permeated water line L21B, and sends it to the control means 100B.
  • the control means 100B performs the following processing as a continuation determination step.
  • the control means 100B opens the seawater system permeate water drainage valve 240 when the salt concentration of the seawater system permeate W21 transmitted from the seawater system permeate water EC meter 230 satisfies the standard that can flow out to the supply system. , Control to close the seawater system valve 210.
  • the seawater-based permeated water W21 flows out to the supply system.
  • the control means 100B performs the second seawater-based reverse osmosis membrane treatment As a process, while opening the seawater system valve
  • the supplied seawater-based permeated water W21 is introduced into the second seawater-based reverse osmosis membrane module 32 and subjected to membrane separation treatment to produce seawater-based repermeated water W31 and seawater-based reconcentrated water W32.
  • the seawater system repermeate water W31 flows out to the supply system. Since the seawater system reconcentrated water W32 has a lower salinity concentration than the seawater system concentrated water W22, it is not drained to the outside of the system and returned to the seawater system reverse osmosis membrane processing means 20B.
  • the seawater desalination system 1B of the second embodiment the following effects can be obtained.
  • the water content of the sewage W10 decreases and the water content of the lower water system permeate water W11 and the lower water system concentrated water W12 generated by the lower water system reverse osmosis membrane treatment means 10A decreases and the salt concentration of the seawater system water W21 increases.
  • the seawater system permeated water W21 whose salt concentration has risen is subjected to the membrane separation process by the second seawater system reverse osmosis membrane processing means 30, the seawater system permeate water W21 whose salt concentration meets the standard can be supplied.
  • the third embodiment will be mainly described focusing on differences from the first embodiment, and the same configuration as that of the first embodiment is denoted by the same reference numeral, and detailed description will be omitted.
  • the description of the first embodiment is appropriately applied to points that are not particularly described in the third embodiment.
  • FIG. 3 is a schematic block diagram which shows the seawater desalination system 1C of 3rd Embodiment of this invention.
  • the seawater desalination system 1C according to the third embodiment is the same as the seawater desalination system 1A according to the first embodiment except that the lower water system permeate water line of the lower water system reverse osmosis membrane processing means, the seawater system permeation of the sea water reverse osmosis membrane processing means The configurations of the water line and the control means are different.
  • the seawater desalination system 1C of 3rd Embodiment is provided with the storage system 40 which the seawater desalination system 1A of 1st Embodiment does not have.
  • the lower water system permeated water line L11C of the lower water system reverse osmosis membrane treatment means 10C is connected to the downstream side of the lower water system reverse osmosis membrane module 12.
  • the lower water system permeated water line L11C is a line through which the lower water system permeated water W11 having permeated through the RO membrane flows.
  • the lower water system salt concentration measurement line L13 and the storage system 40 are connected in order from the upstream side, and the lower water system permeate water W11 is supplied to the storage system 40.
  • the lower water system salt concentration measurement line L13 branches from the lower water system permeate water line L11A at the salinity measurement line branch point J13, the lower water system permeate water W11 flows, and the lower water system permeate water EC as a second salt concentration measurement means A total of 130 are connected.
  • the conductivity of the lower water system permeate water W11 flowing through the lower water system salt concentration measurement line L13 is measured as the second salt concentration measurement step, and converted to the salt concentration.
  • the lower water system permeated water EC meter 130 is connected to the control means 100C, and transmits the measured conductivity or the converted salt concentration of the lower water system permeated water W11 to the control means 100C.
  • the seawater system permeated water line L21C of the seawater system reverse osmosis membrane treatment means 20C is connected to the downstream side of the seawater system reverse osmosis membrane module 22.
  • the seawater system permeated water line L21C is a line through which the seawater-based permeated water W21 having permeated through the RO membrane flows.
  • a seawater-based salt concentration measurement line L23 and a storage system 40 are connected to the seawater system permeated water line L21C in order from the upstream side, and the seawater system permeated water W21 is supplied to the storage system 40.
  • the seawater system salinity measurement line L23 branches from the seawater system permeated water line L21C at the salinity measurement line branch point J23, and the seawater system permeated water W21 flows, and the seawater system permeated water EC as a third salinity concentration measuring means A total of 230 are connected.
  • the seawater system permeated water EC meter 230 measures the conductivity of the seawater-based permeated water W21 flowing through the seawater-based salt concentration measurement line L23 as the third salinity concentration measurement step, and converts it to the salinity concentration.
  • the seawater system permeated water EC meter 230 is connected to the control means 100C, and transmits the measured conductivity of the seawater system permeate water W21 or the converted salt concentration to the control means 100C.
  • the storage system 40 is connected to the storage tank 41 connected to the lower water system permeated water line L11C of the lower water system reverse osmosis membrane processing means 10C and the seawater system permeated water line L21C of the seawater system reverse osmosis membrane processing means 20C, and to the storage tank 41 Storage tank drain line L41, a water level gauge 42 for measuring the water level of the storage tank 41, a storage tank salt concentration measurement line L43 connected to the storage tank 41, and a reservoir tank concentration measurement line L43 connected And a reservoir EC meter 430 as a salinity concentration measurement unit.
  • the storage tank 41 is a mixed permeated water W40 in which the lower water system permeate water W11 supplied from the lower water system reverse osmosis membrane treatment means 10C and the seawater system permeate water W21 supplied from the seawater system reverse osmosis membrane treatment means 20C are mixed. Retain.
  • the storage tank drainage line L41 is a line connected to the bottom of the storage tank 41 and flowing out the mixed permeated water W40 to a supply system (not shown).
  • the water level gauge 42 measures the water level of the mixed permeated water W41 stored in the storage tank 41.
  • the water level gauge 42 is connected to the control means 100C, and transmits the measured water level of the mixed permeated water W40 to the control means 100C.
  • the water level gauge 42 is a pressure type water level gauge which is disposed at the bottom of the storage tank 41 and has a pressure sensor for detecting water pressure and measures the water level from changes in water pressure, but not limited thereto. A water gauge can be used.
  • the storage tank salt concentration measurement line L43 extends to the vicinity of the bottom of the storage tank 41, the mixed permeated water W40 flows, and is connected to the storage tank EC meter 430.
  • the storage tank EC meter 430 measures the conductivity of the mixed permeated water W40 flowing through the storage tank salinity measurement line L43 as the first salinity concentration measurement step, and converts it to the salinity concentration.
  • the storage tank EC meter 430 is connected to the control means 100C, and transmits the measured conductivity or mixed salt concentration of the mixed permeated water W40 to the control means 100C.
  • the control means 100C is electrically connected to an element to be controlled among the elements constituting the seawater desalination system 1C.
  • the control means 100 C controls the water level of the mixed permeated water W 40 measured by the water level gauge 42, the salinity concentration of the lower water system permeated water W 11 measured by the sewerage system permeated water EC meter 130, and the seawater system permeated water EC meter 230.
  • the pressure pump 13 or the pressure pump 23 is controlled in accordance with the salinity concentration of the seawater-based permeated water W21 measured in the above or the salinity concentration of the mixed permeated water W40 measured by the storage tank EC meter 430.
  • the operation of the seawater desalination system 1C until the lower water system permeate water W11 and the seawater system permeate water W21 are generated is the same as that of the seawater desalination system 1A of the first embodiment, and thus the description thereof is omitted.
  • the lower water system permeate water W11 generated by the lower water system reverse osmosis membrane treatment means 10C and the seawater system permeate water W21 generated by the sea water system reverse osmosis membrane treatment means 20C are mixed and become the mixed permeate water W40 in the storage system 40. It is stored in the storage tank 41.
  • the mixed permeated water W40 stored in the storage tank 41 flows out to the supply system from the storage tank drainage line L41, but the generation amounts of the lower water system permeate water W11 and the seawater system permeate water W21 (the generation amount of the mixed permeate water W40) When it is larger than the amount of drainage of the mixed permeated water W40, the mixed permeated water W40 is stored in the storage tank 41. And the water level gauge 42 measures the water level of the mixed permeated water W40 stored by the storage tank 41, and transmits to the control means 100C.
  • the control unit 100C performs the following processing as a determination step.
  • the control means 100C stops the pressurizing pump 23 and treats the seawater system reverse osmosis membrane treatment
  • the driving of the means 20C is stopped.
  • the seawater desalination system 1C only the lower water system reverse osmosis membrane processing means 10C is driven, and only the lower water system permeated water W11 is supplied to the storage tank 41.
  • the control means 100C drives the pressurizing pump 23 to process the seawater system reverse osmosis membrane treatment Activate the means 20C.
  • a predetermined seawater system reverse osmosis membrane process means start water level is set to a position lower than a predetermined seawater system reverse osmosis membrane process means stop water level.
  • the seawater desalination system 1C is driven again by the lower water system reverse osmosis membrane treatment means 10C and the seawater system reverse osmosis membrane treatment means 20C, and the storage tank 41 receives the lower water system permeate water W11 and the seawater system permeation. Water W21 will be supplied.
  • the control means 100C stops the pressure pump 13 and the pressure pump 23, and the lower water system The driving of the reverse osmosis membrane processing means 10A and the seawater system reverse osmosis membrane processing means 20C is stopped.
  • the total reverse osmosis membrane treatment means stop water level is set to a position higher than a predetermined seawater system reverse osmosis membrane treatment means stop water level.
  • the seawater desalination system 1C is in a total stop state where both the lower water system reverse osmosis membrane processing means 10C and the seawater system reverse osmosis membrane processing means 20C are stopped, and the reservoir 41 can be prevented from overflowing.
  • the control means 100C is a pressurizing pump 13.
  • the driving of the lower water system reverse osmosis membrane processing means 10C is started by resuming the driving of 13.
  • control means 100C is the salinity concentration of the lower water system permeate water W11 measured by the lower water system permeated water EC meter 130, the salinity concentration of the seawater system permeate water W21 measured by the seawater system permeated water EC meter 230, or the storage tank EC.
  • the control to stop the pressurizing pump 23 and stop the seawater system reverse osmosis membrane processing means 20C I do.
  • the seawater desalination system 1C only the lower water system reverse osmosis membrane processing means 10C is driven, and only the lower water system permeated water W11 is supplied to the storage tank 41.
  • seawater desalination system 1C of the third embodiment the following effects can be obtained.
  • the seawater system reverse osmosis membrane treatment means 20C mixed water of the lower concentrated water W12 and the seawater W20 having a lower salinity concentration than the seawater W20 is subjected to membrane separation treatment to generate seawater-based permeate water W21 which is fresh water.
  • the energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of seawater W20 having a high concentration.
  • the seawater system reverse osmosis membrane processing means 20C is activated or stopped according to the water level in the storage tank 41 of the mixed permeated water W40 in which the generated freshwater permeate water W11 and seawater system permeate water W21 are mixed. Therefore, for example, a seawater-based reverse osmosis membrane treatment means which requires more energy than the lower water-system reverse osmosis membrane treatment means 10C when the lower water-system permeated water W11 is sufficiently generated and the desired water volume can be secured. Can stop 20C. Therefore, while being able to reduce the energy for producing fresh water, the desalination system 1C which can secure desired water volume in the fresh water to produce can be provided.
  • seawater-based reverse osmosis membrane processing means 20C starts or stops depending on the salt concentration of the seawater-based permeate water W21, the salt concentration of the lower water-system permeate water W11, and the salt concentration of the mixed permeate water W40, for example, If either the salinity concentration of the aqueous permeate water W11 or the salinity concentration of the mixed permeate water W40 is higher than a predetermined reference value, the mixed permeate water W40 which is the generated fresh water by stopping the seawater-based reverse osmosis membrane treatment means 20C. Salinity can be returned to the standard. Therefore, while being able to reduce the energy for producing fresh water, seawater desalination system 1C which can secure water quality in the fresh water to produce can be provided.

Abstract

[Problem] To provide a seawater desalination system in which energy for generating fresh water can be reduced and adequate water quality can be ensured in the generated fresh water. [Solution] A seawater desalination system (1A) is provided with: a wastewater system reverse osmosis membrane treating means (10A) for performing membrane separation treatment on wastewater (W10) to thereby generate wastewater system permeated water (W11) and wastewater system concentrated water (W12); and a seawater system reverse osmosis membrane treating means (20A) for performing membrane separation treatment on a mixture of the wastewater system concentrated water (W12) and collected seawater (W20) to thereby generate seawater system permeated water (W21) and seawater system concentrated water (W22), the seawater system reverse osmosis membrane treating means having a seawater system permeated water EC meter (230) for measuring the salt concentration of the seawater system permeated water (W21). The seawater system permeated water (W21) is fed to the wastewater system reverse osmosis membrane treating means (10A) in accordance with the salt concentration of the seawater system permeated water (W21).

Description

海水淡水化システム及び海水淡水化方法Seawater desalination system and sea water desalination method
　本発明は、海水淡水化システム及び海水淡水化方法に関する。 The present invention relates to a seawater desalination system and a seawater desalination method.
　従来より、海水を膜分離処理することで、淡水を生成する海水淡水化装置が知られている。この海水淡水化装置は、膜分離処理するのに海水を加圧してポンプ等で逆浸透膜ユニットに圧送するため、海水の塩分濃度が高いほど多大なエネルギーが必要となる。 DESCRIPTION OF RELATED ART Conventionally, the sea water desalination apparatus which produces | generates fresh water by carrying out the membrane separation process of seawater is known. Since this seawater desalination apparatus pressurizes seawater for membrane separation processing and pumps it to a reverse osmosis membrane unit with a pump or the like, the higher the salt concentration of seawater, the more energy is required.
　そこで、海水よりも塩分濃度が低い下水を膜分離処理し透過水と濃縮水とに分離する第１処理部と、第１処理部にて生成した濃縮水を希釈用として海水に混合して混合水とし、該混合水を膜分離処理し透過水と濃縮水とに分離する第２処理部とを備え、下水の流入量に基づき第１処理部及び第２処理部を制御する海水淡水化システムが提案されている（特許文献１参照）。
　特許文献１の海水淡水化システムによれば、下水の濃縮水を海水に混合した混合水を膜分離処理することで、下水の流入量が増えれば混合水の塩分濃度を低下させることができるので、海水を膜分離処理する場合に比べて、淡水を生成するためのエネルギーを低減できる。 Therefore, the first treatment unit that separates the sewage having a salt concentration lower than that of seawater by membrane separation and separates it into permeate water and concentrated water, and the concentrated water generated in the first treatment unit are mixed with seawater for dilution and mixed A seawater desalination system comprising: a second processing unit that treats the mixed water as membrane water and separates the mixed water into permeate water and concentrated water, and controls the first processing unit and the second processing unit based on the inflow of sewage Has been proposed (see Patent Document 1).
According to the seawater desalination system of Patent Document 1, when the inflow of the sewage is increased, the salinity concentration of the mixed water can be reduced by subjecting the mixed water obtained by mixing the concentrated water of the sewage to the seawater to a membrane separation process. The energy for producing fresh water can be reduced as compared to the case where seawater is subjected to membrane separation treatment.
特許第４４９９８３５号公報Patent No. 4499835 gazette
　しかしながら、特許文献１に記載の海水淡水化システムは、下水の流入量に基づき第１処理部及び第２処理部を制御するので、生成される淡水の水質が下水の流入量に依存することとなる。ここで、下水は、有機物を含有する有機性廃水や製造工場等の無機性廃水等が濾過処理等された後に排水されたものであるので、その水質や水量が安定して供給されるものではない。このため、特許文献１に記載の海水淡水化システムは、生成する淡水において水質を確保するのが困難である。 However, since the seawater desalination system described in Patent Document 1 controls the first processing unit and the second processing unit based on the inflow of sewage, the generated fresh water quality depends on the inflow of sewage. Become. Here, since the sewage is drained after organic wastewater containing organic substances, inorganic wastewater from manufacturing plants, etc. has been filtered, etc., the quality and quantity of water should be stably supplied. Absent. For this reason, in the seawater desalination system described in Patent Document 1, it is difficult to secure the water quality in the fresh water to be generated.
　本発明は、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において水質を確保できる海水淡水化システムを提供することを目的とする。 An object of the present invention is to provide a seawater desalination system capable of reducing the energy for producing fresh water and securing the water quality of the produced fresh water.
　（１）　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理手段と、前記下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成し、前記海水系透過水の塩分濃度を測定する塩分濃度測定手段を有する海水系逆浸透膜処理手段と、を備え、前記塩分濃度測定手段で測定した前記海水系透過水の塩分濃度に応じて前記海水系透過水を前記下水系逆浸透膜処理手段に供給することを特徴とする海水淡水化システム。 (1) A sewerage system reverse osmosis membrane treatment means for producing sewerage permeated water and sewerage water concentrate by membrane separation treatment of sewage, and a separation treatment of mixed water of the sewerage water and the sewerage concentrated water. A seawater system reverse osmosis membrane treatment unit having a salinity concentration measurement unit that generates a seawater system permeated water and a seawater system concentrated water and measures a salinity concentration of the seawater system permeated water; A seawater desalination system characterized in that the seawater system permeated water is supplied to the sewer system reverse osmosis membrane treatment means according to the salinity concentration of the seawater system permeated water measured by means.
　（１）の発明によれば、下水系逆浸透膜処理手段は、下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する。海水系逆浸透膜処理手段は、下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成し、海水系透過水の塩分濃度を測定する塩分濃度測定手段を有する。海水系透過水の塩分濃度に応じて海水系透過水を下水系逆浸透膜処理手段に供給する。 According to the invention of (1), the lower water system reverse osmosis membrane treatment means generates lower water system permeate water and lower water system concentrated water by subjecting the sewage to membrane separation treatment. The seawater system reverse osmosis membrane treatment means produces a seawater system permeated water and a seawater system concentrate by membrane separation treatment of the mixed water of the lower water system concentrated water and the taken seawater, and the salt concentration of the seawater system permeated water is determined. It has a means to measure salinity. The seawater system permeated water is supplied to the lower water system reverse osmosis membrane treatment means according to the salinity concentration of the seawater system permeated water.
　これにより、海水系逆浸透膜処理手段において、海水より塩分濃度が低い下水系濃縮水と海水の混合水を膜分離処理し淡水である海水系透過水を生成するので、混合水より塩分濃度が高い海水を膜分離処理して淡水を生成する場合に比べて、淡水を生成するためのエネルギーを低減できる。
　また、例えば、下水の水量が低下し下水系逆浸透膜処理手段で生成された下水系透過水と下水系濃縮水の水量が低下し、海水系透過水の塩分濃度が上昇した場合であっても、稼働率が低下した下水系逆浸透膜処理手段を利用して、当該塩分濃度が上昇した海水系透過水を膜分離処理することで、塩分濃度が所定の基準値である海水系透過水を確保できる。
　したがって、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において水質を確保できる海水淡水化システムを提供できる。 As a result, in the seawater-based reverse osmosis membrane treatment means, the mixed water of the lower concentrated water and seawater mixed with seawater having a lower salinity concentration than the seawater is subjected to membrane separation treatment to generate seawater-based permeate water, which is fresh water. The energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of high seawater.
Also, for example, when the amount of sewage decreases and the amounts of the lower system permeated water and the lower system concentrated water produced by the lower system reverse osmosis membrane processing means decrease and the salt concentration of the seawater-based permeate increases. Also, seawater-based permeated water whose salt concentration is a predetermined reference value by subjecting seawater-based permeated water having an increased salinity concentration to a membrane separation treatment using the lower water system reverse osmosis membrane treatment means whose operating rate has decreased Can be secured.
Therefore, while being able to reduce the energy for producing fresh water, the seawater desalination system which can secure the water quality in the fresh water to produce can be provided.
　（２）　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理手段を有する海水淡水化システムであって、前記下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成し、前記海水系透過水の塩分濃度を測定する塩分濃度測定手段を有する海水系逆浸透膜処理手段と、前記塩分濃度測定手段で測定した前記海水系透過水の塩分濃度に応じて、前記下水系逆浸透膜処理手段及び前記海水系逆浸透膜処理手段の駆動を制御する制御手段と、を備えることを特徴とする海水淡水化システム。 (2) A seawater desalination system having a sewerage system reverse osmosis membrane treatment means for producing sewerage permeated water and sewerage water concentrate by membrane separation treatment of sewage, wherein seawater collected with the sewerage water is taken. Seawater-based reverse osmosis membrane treatment means having a salinity concentration measurement means for producing seawater-based permeated water and seawater-based concentrated water by subjecting the mixed water to membrane separation treatment, and measuring the salinity concentration of the seawater-based permeated water; And controlling means for controlling driving of the lower water system reverse osmosis membrane processing means and the sea water type reverse osmosis membrane processing means according to the salinity concentration of the seawater system permeated water measured by the salinity concentration measuring means. Desalination system characterized by
　（２）の発明によれば、下水系逆浸透膜処理手段は、下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する。海水系逆浸透膜処理手段は、下水系濃縮水と海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成し、この海水系透過水の塩分濃度を測定する塩分濃度測定手段を有する。制御手段は、海水系透過水の塩分濃度に応じて、下水系逆浸透膜処理手段及び海水系逆浸透膜処理手段を制御する。 According to the invention of (2), the lower water system reverse osmosis membrane treatment means produces lower water system permeate water and lower water system concentrated water by subjecting the sewage to membrane separation treatment. The seawater system reverse osmosis membrane treatment means produces a seawater system permeated water and a seawater system concentrate by membrane separation treatment of mixed water of the lower water system concentrated water and the seawater, and measures the salinity concentration of this seawater system permeated water Means for measuring salinity. The control means controls the lower water system reverse osmosis membrane treatment means and the sea water based reverse osmosis membrane treatment means according to the salt concentration of the seawater system permeated water.
　これにより、海水系逆浸透膜処理手段において、海水より塩分濃度が低い下水系濃縮水と海水の混合水を膜分離処理し淡水である海水系透過水を生成するので、混合水より塩分濃度が高い海水を膜分離処理して淡水を生成する場合に比べて、淡水を生成するためのエネルギーを低減できる。
　また、生成した淡水である海水系透過水の塩分濃度に応じて、下水系逆浸透膜処理手段及び海水系逆浸透膜処理手段を制御するので、例えば、海水系透過水の塩分濃度が所定の基準値より高ければ、海水系逆浸透膜処理手段の駆動を抑制し海水系透過水の塩分濃度を所定の基準値に戻すことができる。
　したがって、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において水質を確保できる海水淡水化システムを提供できる。 As a result, in the seawater-based reverse osmosis membrane treatment means, the mixed water of the lower concentrated water and seawater mixed with seawater having a lower salinity concentration than the seawater is subjected to membrane separation treatment to generate seawater-based permeate water, which is fresh water. The energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of high seawater.
In addition, since the lower water system reverse osmosis membrane treatment means and the sea water system reverse osmosis membrane treatment means are controlled according to the salt concentration of the generated seawater freshwater permeated water, for example, the salt concentration of the seawater based permeate water is predetermined. If it is higher than the reference value, the driving of the seawater-based reverse osmosis membrane processing means can be suppressed and the salt concentration of the seawater-based permeate can be returned to the predetermined reference value.
Therefore, while being able to reduce the energy for producing fresh water, the seawater desalination system which can secure the water quality in the fresh water to produce can be provided.
　（３）　前記海水系透過水を膜分離処理する第２の海水系逆浸透膜処理手段を更に備え、前記制御手段は、前記塩分濃度測定手段で測定した前記海水系透過水の塩分濃度に応じて前記海水系透過水を前記第２の海水系逆浸透膜処理手段に供給することを特徴とする（２）に記載の海水淡水化システム。 (3) The system further comprises a second seawater system reverse osmosis membrane processing means for subjecting the seawater system permeate water to membrane separation treatment, and the control means is adapted to the salinity concentration of the seawater system permeate water measured by the salinity concentration measurement means. The seawater desalination system according to (2), wherein the seawater system permeated water is supplied to the second seawater system reverse osmosis membrane processing means.
　（３）の発明によれば、海水系透過水を膜分離処理する第２の海水系逆浸透膜処理手段を更に備えた。
　これにより、例えば、下水の水量が低下し下水系逆浸透膜処理手段で生成された下水系透過水と下水系濃縮水の水量が低下し、海水系透過水の塩分濃度が上昇した場合であっても、第２の海水系逆浸透膜処理手段で当該塩分濃度が上昇した海水系透過水を膜分離処理することで、塩分濃度が所定の基準値である海水系透過水を供給できる。 According to the invention of (3), the system further comprises a second seawater system reverse osmosis membrane treatment means for subjecting seawater system permeated water to membrane separation treatment.
As a result, for example, the amount of sewage decreases, and the amounts of the water in the lower water system permeate and the lower water system concentrated water generated by the lower water system reverse osmosis membrane treatment means decrease, and the salinity concentration in the seawater system water increases. However, the seawater-based permeated water whose salt concentration is a predetermined reference value can be supplied by subjecting the seawater-based permeated water having the increased salinity concentration to the membrane separation treatment by the second seawater-based reverse osmosis membrane treatment means.
　（４）　前記制御手段は、前記塩分濃度測定手段で測定した海水系透過水の塩分濃度に応じて、前記海水系透過水を前記下水系逆浸透膜処理手段に供給し、前記下水系逆浸透膜処理手段は、前記海水系逆浸透膜処理手段から供給された前記海水系透過水と下水との混合水を膜分離処理することを特徴とする（２）に記載の海水淡水化システム。 (4) The control means supplies the seawater-based permeated water to the lower water system reverse osmosis membrane treatment means according to the salt concentration of the seawater-based permeate measured by the salt concentration measurement means, and the lower water system reverse osmosis (2) The seawater desalination system according to (2), wherein the membrane processing means performs membrane separation processing on the mixed water of the seawater-based permeated water and the sewage supplied from the seawater-based reverse osmosis membrane treatment means.
　（４）の発明によれば、海水系透過水の塩分濃度に応じて、当該海水系透過水を下水系逆浸透膜処理手段で膜分離処理する。
　これにより、例えば、下水の水量が低下し下水系逆浸透膜処理手段で生成された下水系透過水と下水系濃縮水の水量が低下し、海水系透過水の塩分濃度が上昇した場合であっても、稼働率が低下した下水系逆浸透膜処理手段を利用して、当該塩分濃度が上昇した海水系透過水を膜分離処理することで、塩分濃度が所定の基準値である海水系透過水を供給できる。 According to the invention of (4), the seawater-based permeated water is subjected to the membrane separation treatment by the lower water system reverse osmosis membrane treatment means according to the salt concentration of the seawater-based permeated water.
As a result, for example, the amount of sewage decreases, and the amounts of the water in the lower water system permeate and the lower water system concentrated water generated by the lower water system reverse osmosis membrane treatment means decrease, and the salinity concentration in the seawater system water increases. Even if the seawater system permeated water in which the salinity concentration has risen is subjected to the membrane separation treatment using the lower water system reverse osmosis membrane processing means whose operating rate has decreased, the seawater system permeation whose salinity concentration is a predetermined reference value It can supply water.
　（５）　前記海水系逆浸透膜処理手段が備える逆浸透膜は、前記下水系逆浸透膜処理手段に流入する下水の流入量及び塩分濃度、前記海水系逆浸透膜処理手段に流入する海水の流入量及び塩分濃度、予め設定される前記海水系逆浸透膜処理手段が生成する海水系透過水の水量及び塩分濃度に基づき選択された、好適な脱塩率の逆浸透膜であることを特徴とする（２）から（４）のいずれかに記載の海水淡水化システム。 (5) The reverse osmosis membrane included in the seawater-based reverse osmosis membrane treatment means is an inflow amount and a salinity concentration of the sewage flowing into the lower water system reverse osmosis membrane treatment means, and the seawater flowing into the seawater-based reverse osmosis membrane treatment means It is characterized by being a reverse osmosis membrane with a suitable demineralization rate, which is selected based on the inflow amount and the salinity concentration, the water amount and salinity concentration of the seawater system permeated water generated by the seawater system reverse osmosis membrane treatment means set in advance. The seawater desalination system according to any one of (2) to (4).
　ここで、逆浸透膜は、脱塩率が略５５％から略９９％と様々な膜がある。逆浸透膜処理手段では、一般的に逆浸透膜の脱塩率が高いほど、揚程の能力がより高くより多くのエネルギーを必要とするポンプが必要になる。
　（５）の発明によれば、下水系及び海水系の逆浸透膜処理手段の流入量及び塩分濃度、予め設定される海水系逆浸透膜処理手段が生成する海水系透過水の水量及び塩分濃度から、好適な脱塩率の逆浸透膜を選択することで、エネルギー効率が好適なポンプを用いることが可能となり、淡水を生成するためのエネルギーをより低減できる。 Here, as the reverse osmosis membrane, there are various membranes having a desalting rate of about 55% to about 99%. In reverse osmosis membrane treatment means, generally, the higher the desalting rate of the reverse osmosis membrane, the higher the capacity of the lift and the more the pump requiring more energy is required.
According to the invention of (5), the inflow amount and salinity concentration of the reverse osmosis membrane treatment means of the lower water system and the seawater system, the water quantity and salinity concentration of the seawater system permeated water generated by the seawater system reverse osmosis membrane treatment means set in advance Thus, by selecting a reverse osmosis membrane with a suitable desalting rate, it is possible to use a pump with a suitable energy efficiency, and energy for producing fresh water can be further reduced.
　（６）　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理手段と、海水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する海水系逆浸透膜処理手段と、前記下水系透過水と前記海水系透過水とが混合された混合透過水を貯留する貯留槽及び当該貯留槽に貯留された混合透過水の水位を計測する水位計を有する貯留システムと、を備え、前記貯留システムは、前記水位計で計測した水位に応じて前記海水系逆浸透膜処理手段を、起動又は停止することを特徴とする海水淡水化システム。 (6) A reverse osmosis reverse osmosis membrane treatment means that produces lower permeate permeate water and lower intake water concentrate by membrane separation treatment of sewage, and seawater permeate permeate water and seawater concentrate by treating membrane water with membrane separation treatment And a storage tank for storing mixed permeated water in which the permeated water from the lower water system and the seawater based permeated water are mixed, and a water level of the mixed permeated water stored in the storage tank. A storage system having a water level gauge for measuring the sea water freshwater characterized in that the storage system starts or stops the seawater system reverse osmosis membrane processing means in accordance with the water level measured by the water level gauge. System.
　（６）の発明によれば、下水系逆浸透膜処理手段は、下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する。海水系逆浸透膜処理手段は、海水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する。貯留システムは、下水系透過水と海水系透過水とが混合された混合透過水を貯留する貯留槽及び当該貯留槽に貯留された混合透過水の水位を計測する水位計を有する。そして、貯留システムは、水位計で計測した混合透過水の水位に応じて海水系逆浸透膜処理手段を、起動又は停止する。 According to the invention of (6), the lower water system reverse osmosis membrane treatment means produces lower water system permeate water and lower water system concentrated water by subjecting the sewage to membrane separation treatment. A seawater system reverse osmosis membrane processing means produces seawater system permeated water and seawater system concentrated water by carrying out the membrane separation process of seawater. The storage system has a storage tank for storing mixed permeated water in which the lower water system permeated water and the seawater-based permeated water are mixed, and a water level gauge for measuring the water level of the mixed permeated water stored in the storage tank. And a storage system starts or stops a seawater system reverse osmosis membrane process means according to the water level of the mixed permeated water measured with the water level gauge.
　これにより、海水系逆浸透膜処理手段において、海水より塩分濃度が低い下水系濃縮水と海水の混合水を膜分離処理し淡水である海水系透過水を生成するので、混合水より塩分濃度が高い海水を膜分離処理して淡水を生成する場合に比べて、淡水を生成するためのエネルギーを低減できる。
　また、生成した淡水である下水系透過水と海水系透過水とが混合された混合透過水の貯留槽における水位に応じて海水系逆浸透膜処理手段を、起動又は停止するので、例えば、下水系透過水が十分に生成され、所望の水量が確保できている場合に、下水系逆浸透膜処理手段に比べ多くのエネルギーを必要とする海水系逆浸透膜処理手段を停止できる。
　したがって、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において所望の水量を確保できる海水淡水化システムを提供できる。 As a result, in the seawater-based reverse osmosis membrane treatment means, the mixed water of the lower concentrated water and seawater mixed with seawater having a lower salinity concentration than the seawater is subjected to membrane separation treatment to generate seawater-based permeate water, which is fresh water. The energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of high seawater.
In addition, since the seawater-based reverse osmosis membrane treatment means is activated or stopped according to the water level in the storage tank of the mixed permeated water in which the generated fresh water in the lower water system permeated water and the seawater-based permeated water are mixed, for example, When the water-system permeated water is produced sufficiently and the desired amount of water can be secured, the seawater-based reverse osmosis membrane treatment means which requires more energy than the lower water-system reverse osmosis membrane treatment means can be stopped.
Therefore, it is possible to provide a seawater desalination system capable of reducing the energy for producing fresh water and securing a desired amount of produced fresh water.
　（７）　前記貯留システムは、前記貯留槽に貯留された混合透過水の塩分濃度を測定する第１の塩分濃度測定手段を有し、前記下水系逆浸透膜処理手段は、生成した下水系透過水の塩分濃度を測定する第２の塩分濃度測定手段を有し、前記海水系逆浸透膜処理手段は、生成した海水系透過水の塩分濃度を測定する第３の塩分濃度測定手段を有し、前記海水系透過水の塩分濃度、前記下水系透過水の塩分濃度及び前記混合透過水の塩分濃度に応じて、起動又は停止することを特徴とする（６）に記載の海水淡水化システム。 (7) The storage system has a first salinity concentration measurement means for measuring the salinity concentration of the mixed permeated water stored in the storage tank, and the lower water system reverse osmosis membrane treatment means comprises the generated lower water system permeation It has a second salinity concentration measuring means for measuring the salinity concentration of water, and the seawater system reverse osmosis membrane processing means has a third salinity concentration measuring means for measuring the salinity concentration of the generated seawater system permeated water The seawater desalination system according to (6), wherein the seawater desalination system according to (6) is activated or stopped according to the salinity concentration of the seawater-based permeate, the salinity concentration of the lower-system permeated water, and the salinity concentration of the mixed permeate.
　（７）の発明によれば、海水系逆浸透膜処理手段は、海水系透過水の塩分濃度、下水系透過水の塩分濃度及び混合透過水の塩分濃度に応じて、起動又は停止するので、例えば、下水系透過水の塩分濃度及び混合透過水の塩分濃度のいずれかが所定の基準値より高ければ、海水系逆浸透膜処理手段を停止することで、生成した淡水である混合透過水の塩分濃度を所定の基準値以内に戻すことができる。
　したがって、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において水質を確保できる海水淡水化システムを提供できる。 According to the invention of (7), the seawater-based reverse osmosis membrane treatment means is started or stopped depending on the salt concentration of the seawater-based permeate, the salt concentration of the lower water-system permeate, and the salt concentration of the mixed permeate. For example, if either the salinity concentration of the permeated water in the lower water system or the salinity concentration of the mixed permeated water is higher than a predetermined reference value, stopping the seawater-based reverse osmosis membrane treatment means will result in the mixed permeated water being the generated fresh water. The salinity concentration can be returned to within a predetermined reference value.
Therefore, while being able to reduce the energy for producing fresh water, the seawater desalination system which can secure the water quality in the fresh water to produce can be provided.
　（８）　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理工程と、前記下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する海水系逆浸透膜処理工程と、前記海水系透過水の塩分濃度を測定する塩分濃度測定工程と、前記海水系透過水の塩分濃度に応じて前記海水系透過水を前記下水系逆浸透膜処理工程に戻す海水系透過水循環工程と、を備えることを特徴とする海水淡水化方法。
　（８）の発明によれば、（１）の発明と同様の作用効果を奏する。 (8) A process of reverse osmosis reverse osmosis membrane treatment that produces a permeated water of the lower water system and a concentrated water of lower water system by membrane separation treatment of sewage, and the mixed water of the lower concentrated water and the taken seawater is subjected to membrane separation treatment A seawater system reverse osmosis membrane treatment process which produces seawater system permeated water and seawater system concentrated water, a salinity concentration measurement process which measures salinity concentration of the seawater system permeated water, salinity concentration of the seawater system permeated water And a seawater system permeated water circulation process for returning the seawater system permeated water to the sewer system reverse osmosis membrane treatment process according to the above.
According to the invention of (8), the same function and effect as the invention of (1) are exerted.
　（９）　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理工程を有する海水淡水化方法であって、前記下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する海水系逆浸透膜処理工程と、前記海水系透過水の塩分濃度を測定する塩分濃度測定工程と、前記海水系透過水の塩分濃度に応じて、前記下水系逆浸透膜処理工程及び前記海水系逆浸透膜処理工程の継続を決定する継続決定工程と、を備えることを特徴とする海水淡水化方法。
　（９）の発明によれば、（２）の発明と同様の作用効果を奏する。 (9) A seawater desalination method comprising a lower water system reverse osmosis membrane treatment step of producing a lower water system permeate water and a lower water system concentrated water by membrane separation treatment of sewage, wherein the lower water system concentrated water and the seawater withdrawn A seawater-based reverse osmosis membrane treatment step of producing seawater-based permeated water and seawater-based concentrated water by subjecting mixed water to membrane separation treatment, and a salt concentration measurement step of measuring the salinity concentration of the seawater-based permeated water; A seawater desalination method comprising: a continuation determination step of determining continuation of the lower water system reverse osmosis membrane treatment step and the seawater type reverse osmosis membrane treatment step according to the salinity concentration of the seawater system permeated water .
According to the invention of (9), the same function and effect as the invention of (2) can be obtained.
　（１０）　前記海水系透過水を膜分離処理する第２の海水系逆浸透膜処理工程を更に備え、前記塩分濃度測定工程で測定した前記海水系透過水の塩分濃度に応じて前記海水系透過水を前記第２の海水系逆浸透膜処理工程で処理することを特徴とする（９）に記載の海水淡水化方法。
　（１０）の発明によれば、（３）の発明と同様の作用効果を奏する。 (10) The method further comprises a second seawater system reverse osmosis membrane treatment step of subjecting the seawater system permeate water to membrane separation treatment, and the seawater system permeation according to the salinity concentration of the seawater system permeate water measured in the salinity concentration measurement step. The seawater desalination method according to (9), wherein water is treated in the second seawater system reverse osmosis membrane treatment step.
According to the invention of (10), the same function and effect as the invention of (3) are exerted.
　（１１）　前記塩分濃度測定工程で測定した海水系透過水の塩分濃度に応じて、前記海水系透過水を前記下水系逆浸透膜処理工程に戻す海水系透過水循環工程と、を備え、前記下水系逆浸透膜処理工程は、前記海水系透過水循環工程において戻された前記海水系透過水と下水との混合水を膜分離処理することを特徴とする（９）に記載の海水淡水化方法。
　（１１）の発明によれば、（４）の発明と同様の作用効果を奏する。 (11) A seawater system permeated water circulation process for returning the seawater system permeated water to the downstream water system reverse osmosis membrane treatment process according to the salinity concentration of the seawater system permeated water measured in the salinity concentration measurement process, In the water-based reverse osmosis membrane treatment step, the seawater separation method according to (9) is characterized in that the mixed water of the seawater-based permeated water and the sewage returned in the seawater-based permeated water circulation step is subjected to a membrane separation treatment.
According to the invention of (11), the same function and effect as the invention of (4) can be obtained.
　（１２）　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理工程と、海水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する海水系逆浸透膜処理工程と、前記下水系透過水と前記海水系透過水とが混合された混合透過水を貯留槽に貯留する貯留工程と、当該貯留槽に貯留された混合透過水の水位を計測する水位計測工程と、前記水位計測工程で計測した水位に応じて前記海水系逆浸透膜処理工程を、行うか否かを決定する決定工程と、を備えることを特徴とする海水淡水化方法。
　（１２）の発明によれば、（６）の発明と同様の作用効果を奏する。 (12) A reverse osmosis reverse osmosis membrane treatment process that generates lower permeate permeate and lower concentrate drainage by membrane separation treatment of sewage, and seawater permeate and seawater concentrate by membrane separation treatment of seawater A reverse osmosis membrane treatment step of producing the mixed water stored in the storage tank, a mixed permeated water in which the lower water system permeated water and the seawater type permeated water are mixed, and the mixture stored in the storage tank It has a water level measurement process of measuring the water level of the permeated water, and a determination process of determining whether to perform the seawater system reverse osmosis membrane treatment process according to the water level measured in the water level measurement process. Sea water desalination method.
According to the invention of (12), the same function and effect as the invention of (6) are exerted.
　（１３）　前記貯留槽に貯留された混合透過水の塩分濃度を測定する第１の塩分濃度測定工程と、前記下水系逆浸透膜処理工程において生成した下水系透過水の塩分濃度を測定する第２の塩分濃度測定工程と、前記海水系逆浸透膜処理工程において生成した海水系透過水の塩分濃度を測定する第３の塩分濃度測定工程と、を更に備え、前記決定工程は、前記海水系透過水の塩分濃度、前記下水系透過水の塩分濃度及び前記混合透過水の塩分濃度に応じて前記海水系逆浸透膜処理工程を、行うか否かを決定することを特徴とする（１２）に記載の海水淡水化方法。
　（１３）の発明によれば、（７）の発明と同様の作用効果を奏する。 (13) A first salt concentration measurement step of measuring the salt concentration of the mixed permeated water stored in the storage tank, and a salt concentration of the lower water system permeated water generated in the lower water system reverse osmosis membrane treatment step 2 further comprising: a salt concentration measuring step 2; and a third salt concentration measuring step of measuring the salt concentration of the seawater-based permeated water generated in the seawater-based reverse osmosis membrane treatment step, wherein the determining step comprises Whether or not to perform the seawater-based reverse osmosis membrane treatment step is determined according to the salt concentration of the permeate water, the salt concentration of the lower water system permeate water, and the salt concentration of the mixed permeate water (12) The seawater desalination method as described in.
According to the invention of (13), the same function and effect as the invention of (7) are exerted.
　本発明によれば、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において水質を確保できる海水淡水化システム及び海水淡水化方法を提供できる。 ADVANTAGE OF THE INVENTION According to this invention, while being able to reduce the energy for producing | generating fresh water, the seawater desalination system and seawater desalination method which can ensure a water quality in the produced fresh water can be provided.
本発明の第１実施形態の海水淡水化システムを示す概略構成図である。It is a schematic block diagram which shows the seawater desalination system of 1st Embodiment of this invention. 本発明の第２実施形態の海水淡水化システムを示す概略構成図である。It is a schematic block diagram which shows the seawater desalination system of 2nd Embodiment of this invention. 本発明の第３実施形態の海水淡水化システムを示す概略構成図である。It is a schematic block diagram which shows the seawater desalination system of 3rd Embodiment of this invention.
＜第１実施形態＞
　図１を参照して、本発明の第１実施形態の海水淡水化システム１Ａについて説明する。図１は、本発明の第１実施形態の海水淡水化システム１Ａを示す概略構成図である。 First Embodiment
A seawater desalination system 1A according to a first embodiment of the present invention will be described with reference to FIG. FIG. 1: is a schematic block diagram which shows the seawater desalination system 1A of 1st Embodiment of this invention.
　図１に示すように、第１実施形態の海水淡水化システム１Ａは、下水系逆浸透膜処理手段１０Ａと、海水系逆浸透膜処理手段２０Ａと、制御手段１００Ａと、を備えており、下水Ｗ１０及び海水Ｗ２０を膜分離処理し、淡水である下水系透過水Ｗ１１及び海水系透過水Ｗ２１を生成する装置である。本明細書における海水Ｗ２０は、海、湖、沼、池等に存在する水であって、塩分濃度が略１．０質量％以上略４．０質量％以下の水である。また、本明細書における下水Ｗ１０は、有機物を含有する有機性廃水や製造工場等の無機性廃水等が濾過処理等された後に排水されたものであって、塩分濃度が海水Ｗ２０よりも低い水である。また、本明細書における淡水とは、塩分濃度が低い水である。 As shown in FIG. 1, the seawater desalination system 1A according to the first embodiment includes the lower water system reverse osmosis membrane processing means 10A, the seawater system reverse osmosis membrane processing means 20A, and the control means 100A, and It is an apparatus which carries out the membrane separation process of W10 and seawater W20, and generates lower water system permeated water W11 and seawater system permeated water W21 which are freshwater. The seawater W20 in the present specification is water present in the sea, a lake, a swamp, a pond or the like, and is a water having a salt concentration of about 1.0% by mass or more and about 4.0% by mass or less. In addition, the sewage W10 in the present specification is an organic wastewater containing organic matter, inorganic wastewater such as in a manufacturing plant, and the like, which is drained after being subjected to a filtration process and the like, and has a salinity concentration lower than that of seawater W20. It is. Further, fresh water in the present specification is water having a low salt concentration.
　海水淡水化システム１Ａは、下水Ｗ１０を膜分離処理することで下水系透過水Ｗ１１と下水系濃縮水Ｗ１２とを生成する下水系逆浸透膜処理手段１０Ａと、下水系濃縮水Ｗ１２と取水した海水Ｗ２０との混合水を膜分離処理することで海水系透過水Ｗ２１と海水系濃縮水Ｗ２２とを生成し、この海水系透過水Ｗ２１の塩分濃度を測定する導電率計(以下、ＥＣ計と称する)２３０を有する海水系逆浸透膜処理手段２０Ａと、海水系透過水Ｗ２１の塩分濃度に応じて、下水系逆浸透膜処理手段１０及び海水系逆浸透膜処理手段２０Ａの駆動を制御する制御手段１００Ａと、を備える。 The seawater desalination system 1A is a reverse water system reverse osmosis membrane treatment means 10A that generates the lower water system permeate water W11 and the lower water system concentrated water W12 by subjecting the sewage W10 to membrane separation treatment, and the seawater taken with the lower water system concentrated water W12. A conductivity meter (hereinafter referred to as an EC meter) that produces seawater-based permeate water W21 and seawater-based concentrated water W22 by performing membrane separation processing of mixed water with W20, and measures the salinity concentration of this seawater-based permeate water W21 Control means for controlling driving of the lower water system reverse osmosis membrane processing means 10 and the seawater type reverse osmosis membrane processing means 20A according to the salt water concentration of the seawater type reverse osmosis membrane processing means 20A having 230 and the seawater system permeated water W21. And 100A.
　海水淡水化システム１Ａは、海水系透過水Ｗ２１の塩分濃度が、透過水を使用する供給系（図示無し）へ流出できる基準を満たしていれば海水系透過水Ｗ２１を供給系へ流出し、供給系へ流出できる基準を満たしていない場合には海水系透過水Ｗ２１を下水系逆浸透膜処理手段１０Ａに循環させる。以下、海水淡水化システム１Ａの各構成について詳細に説明する。 The seawater desalination system 1A allows the seawater-based permeate water W21 to flow out to the supply system if the salt concentration of the seawater-based permeate water W21 satisfies the standard that can flow out to the supply system (not shown) using the permeate water. When it does not satisfy the standard which can flow out to the system, the seawater system permeated water W21 is circulated to the lower water system reverse osmosis membrane treatment means 10A. Hereinafter, each configuration of the seawater desalination system 1A will be described in detail.
　下水系逆浸透膜処理手段１０Ａは、系外から下水Ｗ１０を供給する下水ラインＬ１０と、下水ラインＬ１０に設けられ、下水Ｗ１０に含まれる汚泥を濾過する下水系前処理モジュール１１と、下水ラインＬ１０に接続され、下水Ｗ１０を膜分離処理し、下水系透過水Ｗ１１及び下水系濃縮水Ｗ１２を生成する下水系逆浸透膜モジュール１２と、下水ラインＬ１０において、下水系逆浸透膜モジュール１２より上流側に設けられた加圧ポンプ１３と、下水系逆浸透膜モジュール１２に接続された下水系透過水ラインＬ１１Ａと、下水系逆浸透膜モジュール１２に接続された下水系濃縮水ラインＬ１２と、を最低限備える。なお、本明細書でいう「ライン」とは、流体の流通が可能なラインであり、流路、経路、管路等が含まれる。 The lower water system reverse osmosis membrane treatment means 10A is provided in the sewage line L10 for supplying the sewage W10 from outside the system and the sewage line L10, and the lower water system pretreatment module 11 for filtering sludge contained in the sewage W10, and the sewage line L10. Connected to the lower water system reverse osmosis membrane module 12 for membrane separation treatment of the sewage W10 to generate the lower water system permeate water W11 and the lower water system concentrated water W12, and the sewage line L10 upstream of the lower water system reverse osmosis membrane module 12 And the lower water system permeated water line L11A connected to the lower water system reverse osmosis membrane module 12 and the lower water system concentrated water line L12 connected to the lower water system reverse osmosis membrane module 12 Limited. In addition, the "line" as used in this specification is a line which can distribute | circulate a fluid, and a flow path, a path | route, a pipeline etc. are included.
　下水ラインＬ１０は、海水淡水化システム１Ａの系外から延びて下水系前処理モジュール１１を介して下水系逆浸透膜モジュール１２に接続されており、下水系前処理モジュール１１により汚泥が除去された下水Ｗ１０を下水系逆浸透膜モジュール１２に導入する。 The sewage line L10 extends from outside the seawater desalination system 1A and is connected to the lower water system reverse osmosis membrane module 12 via the lower water system pretreatment module 11, and the sludge is removed by the lower water system pretreatment module 11. The sewage W 10 is introduced into the lower water system reverse osmosis membrane module 12.
　下水系前処理モジュール１１は、下水ラインＬ１０において下水系逆浸透膜モジュール１２の上流側に設けられ、膜分離活性汚泥法により下水Ｗ１０に含まれる汚泥を濾過し除去する。本実施形態において下水系前処理モジュール１１は、濾過媒体としての精密濾過膜あるいは限外濾過膜（図示せず）を備える。なお、下水系前処理モジュール１１は、本実施形態において、精密濾過膜あるいは限外濾過膜を用いているが、これに限らず、下水Ｗ１０に含まれる汚泥を除去する他の濾過装置を用いることもできる。 The lower water system pretreatment module 11 is provided upstream of the lower water system reverse osmosis membrane module 12 in the sewage line L10, and filters and removes the sludge contained in the sewage W10 by the membrane separation activated sludge method. In the present embodiment, the lower water system pretreatment module 11 includes a microfiltration membrane or an ultrafiltration membrane (not shown) as a filtration medium. In the present embodiment, although the microfiltration membrane or the ultrafiltration membrane is used in the lower water system pretreatment module 11, the present invention is not limited to this, and another filtration device for removing sludge contained in the sewage W10 may be used. You can also.
　下水系逆浸透膜モジュール１２は、下水ラインＬ１０の下流側の端部に接続されている。下水系逆浸透膜モジュール１２は、下水系前処理モジュール１１により汚泥が除去された下水Ｗ１０を逆浸透膜（以下、「ＲＯ膜」ともいう）により膜分離処理し、下水系透過水Ｗ１１及び下水系濃縮水Ｗ１２を生成する。下水系逆浸透膜モジュール１２は、単一又は複数のＲＯ膜エレメント（図示せず）を備えており、これらのＲＯ膜エレメントにより水中の溶存塩類を除去する。ＲＯ膜エレメントは、下水系逆浸透膜処理手段１０Ａに流入する下水Ｗ１０の流入量及び塩分濃度に基づき好適な脱塩率の膜が選択される。加圧ポンプ１３は、下水ラインＬ１０に設けられており、下水Ｗ１０を加圧し、下水系逆浸透膜モジュール１２に送出する。 The lower water system reverse osmosis membrane module 12 is connected to the downstream end of the sewage line L10. The lower water system reverse osmosis membrane module 12 performs the membrane separation process of the sewage W10 from which the sludge has been removed by the lower water system pretreatment module 11 with a reverse osmosis membrane (hereinafter also referred to as “RO membrane”). An aqueous concentrated water W12 is produced. The lower water system reverse osmosis membrane module 12 includes one or more RO membrane elements (not shown), and these RO membrane elements remove dissolved salts in water. As the RO membrane element, a membrane having a suitable desalting rate is selected based on the inflow and salinity of the sewage W10 flowing into the lower water system reverse osmosis membrane treatment means 10A. The pressurization pump 13 is provided in the sewage line L10, pressurizes the sewage W10, and sends it to the lower water system reverse osmosis membrane module 12.
　下水系透過水ラインＬ１１Ａ及び下水系濃縮水ラインＬ１２は、下水系逆浸透膜モジュール１２の下流側に接続されている。下水系透過水ラインＬ１１Ａは、ＲＯ膜を透過した下水系透過水Ｗ１１が流通し、下水系透過水Ｗ１１を系外へ排水するラインである。下水系濃縮水ラインＬ１２は、ＲＯ膜を透過しなかった下水系濃縮水Ｗ１２が流通するラインである。下水系濃縮水ラインＬ１２は、海水系逆浸透膜処理手段２０に接続され、海水系逆浸透膜処理手段２０に下水系濃縮水Ｗ１２を供給する。 The lower water system permeated water line L11A and the lower water system concentrated water line L12 are connected to the downstream side of the lower water system reverse osmosis membrane module 12. The lower water system permeated water line L11A is a line through which the lower water system permeated water W11 having permeated through the RO membrane flows and drains the lower water system permeated water W11 out of the system. The lower water system concentrated water line L12 is a line through which the lower water system concentrated water W12 which has not permeated the RO membrane flows. The lower water system concentrated water line L12 is connected to the seawater-based reverse osmosis membrane treatment means 20, and supplies the lower water system concentrated water W12 to the seawater-based reverse osmosis membrane treatment means 20.
　海水系逆浸透膜処理手段２０Ａは、系外から海水Ｗ２０を供給する海水ラインＬ２０Ａと、海水ラインＬ２０Ａに設けられ、海水Ｗ２０に含まれる浮遊細菌等（以下、「細菌、ウィルス、ＳＳ（浮遊物質）等」ともいう）を濾過する砂濾過やＶＦ（限外濾過膜）等の海水系前処理モジュール２１と、海水ラインＬ２０Ａに接続され、海水Ｗ２０を膜分離処理し、海水系透過水Ｗ２１及び海水系濃縮水Ｗ２２を生成する海水系逆浸透膜モジュール２２と、海水ラインＬ２０Ａにおいて、海水系逆浸透膜モジュール２２より上流側に設けられた加圧ポンプ２３と、海水系逆浸透膜モジュール２２に接続された海水系透過水ラインＬ２１Ａと、海水系逆浸透膜モジュール２２に接続された海水系濃縮水ラインＬ２２と、海水系透過水ラインＬ２１から分岐する海水系塩分濃度測定ラインＬ２３と、海水系塩分濃度測定ラインＬ２３を介して、海水系透過水ラインＬ２１に送出された海水系透過水Ｗ２１の塩分濃度を測定するＥＣ計２３０と、海水系透過水ラインＬ２１から分岐する海水系透過水排水ラインＬ２４と、海水系透過水ラインＬ２１から分岐する海水系透過水循環ラインＬ２５と、を備える。 The seawater system reverse osmosis membrane treatment means 20A is provided to a seawater line L20A supplying seawater W20 from outside the system and a seawater line L20A, and suspended bacteria etc. contained in seawater W20 (hereinafter referred to as “bacteria, virus, SS (suspended matter And so on) seawater filtration module 21 such as sand filtration or VF (ultrafiltration membrane), and seawater line L20A, and the seawater W20 is subjected to membrane separation treatment, seawater system permeate water W21 and The seawater system reverse osmosis membrane module 22 for producing the seawater system concentrated water W22, the pressurizing pump 23 provided on the upstream side of the seawater system reverse osmosis membrane module 22 in the seawater line L20A, and the seawater system reverse osmosis membrane module 22 The seawater system permeated water line L21A connected, the seawater system concentrated water line L22 connected to the seawater system reverse osmosis membrane module 22, and the seawater system permeated water line L21 EC meter 230 for measuring the salinity of seawater system permeated water W21 delivered to seawater system permeated water line L21 via seawater system salinity measurement line L23 and the seawater system salinity concentration measurement line L23, and A seawater-based permeated water drainage line L24 branched from the system permeated water line L21 and a seawater-based permeated water circulation line L25 branched from the seawater-based permeated water line L21 are provided.
　海水ラインＬ２０Ａは、海水淡水化システム１Ａの系外から延びて海水系前処理モジュール２１を介して海水系逆浸透膜モジュール２２に接続されている。また、海水ラインＬ２０Ａは、海水系前処理モジュール２１と海水系逆浸透膜モジュール２２との間の下水系濃縮水ライン接続点Ｊ１２で下水系濃縮水ラインＬ１２が接続されている。加圧ポンプ２３は、海水ラインＬ２０Ａに設けられており、海水系前処理モジュール２１により細菌、ＳＳ等が除去された海水Ｗ２０と下水系逆浸透膜処理手段１０Ａから供給された下水系濃縮水Ｗ１２との混合水を加圧し、海水系逆浸透膜モジュール２２に送出する。 The seawater line L20A extends from outside the seawater desalination system 1A and is connected to the seawater-based reverse osmosis membrane module 22 via the seawater-based pretreatment module 21. The seawater line L20A is connected to the lower concentrated water line L12 at the lower concentrated water line connection point J12 between the seawater system pretreatment module 21 and the seawater reverse osmosis membrane module 22. The pressurizing pump 23 is provided in the seawater line L20A, and seawater W20 from which bacteria, SS and the like have been removed by the seawater system pretreatment module 21 and lower water system concentrated water W12 supplied from the lower water system reverse osmosis membrane processing means 10A. The mixed water with the above is pressurized and delivered to the seawater-based reverse osmosis membrane module 22.
　海水系前処理モジュール２１は、海水ラインＬ２０Ａにおいて海水系逆浸透膜モジュール２２の上流側に設けられ、膜分離処理により海水Ｗ２０に含まれる細菌、ウィルス、ＳＳ等を濾過し除去する。本実施形態において海水系前処理モジュール２１は、海水Ｗ２０を砂濾過した後、限外濾過膜（図示せず）により膜分離処理する。なお、海水系前処理モジュール２１は、本実施形態において、限外濾過膜を用いているが、これに限らず、海水Ｗ２０に含まれる細菌、ＳＳやウィルスＳＳを除去する精密濾過膜等の他の濾過膜を用いることもできる。 The seawater system pretreatment module 21 is provided upstream of the seawater-based reverse osmosis membrane module 22 in the seawater line L20A, and filters and removes bacteria, viruses, SS and the like contained in the seawater W20 by the membrane separation process. In the present embodiment, the seawater-based pretreatment module 21 filters the seawater W 20 by sand, and then performs membrane separation treatment using an ultrafiltration membrane (not shown). In the present embodiment, the seawater-based pretreatment module 21 uses an ultrafiltration membrane, but the present invention is not limited to this, and other components such as microfiltration membranes for removing bacteria, SS and virus SS contained in seawater W20 Filter membranes can also be used.
　海水系逆浸透膜モジュール２２は、海水ラインＬ２０Ａの下流側に接続されている。海水系逆浸透膜モジュール２２は、海水系前処理モジュール２１により細菌、ウィルス、ＳＳ等が除去された海水Ｗ２０と下水系逆浸透膜処理手段１０から供給された下水系濃縮水Ｗ１２との混合水を逆浸透膜により膜分離処理し、海水系透過水Ｗ２１及び海水系濃縮水Ｗ２２を生成する。海水系逆浸透膜モジュール２２は、単一又は複数のＲＯ膜エレメント（図示せず）を備えており、これらのＲＯ膜エレメントにより水中の溶存塩類を除去する。ＲＯ膜エレメントは、海水系逆浸透膜処理手段２０に流入する海水Ｗ２０の流入量及び塩分濃度、予め設定されている海水系逆浸透膜処理手段２０が生成する海水系透過水Ｗ２１の水量及び塩分濃度に基づき好適な脱塩率の膜が選択される。 The seawater system reverse osmosis membrane module 22 is connected to the downstream side of the seawater line L20A. The seawater system reverse osmosis membrane module 22 is a mixed water of seawater W 20 from which bacteria, viruses, SS and the like have been removed by the seawater system pretreatment module 21 and the sewage system concentrated water W12 supplied from the sewerage reverse osmosis membrane processing means 10. Are subjected to membrane separation treatment using a reverse osmosis membrane to produce seawater-based permeate water W21 and seawater-based concentrated water W22. The seawater system reverse osmosis membrane module 22 includes one or more RO membrane elements (not shown), and these RO membrane elements remove dissolved salts in water. The RO membrane element is the inflow amount and salinity concentration of the seawater W 20 flowing into the seawater system reverse osmosis membrane processing means 20, the water volume and salinity of the seawater system permeated water W 21 generated by the seawater system reverse osmosis membrane processing means 20 set in advance. A membrane with a suitable desalting rate is selected based on the concentration.
　海水系透過水ラインＬ２１Ａ及び海水系濃縮水ラインＬ２２は、海水系逆浸透膜モジュール２２の下流側に接続されている。海水系透過水ラインＬ２１Ａは、ＲＯ膜を透過した海水系透過水Ｗ２１が流通するラインである。海水系透過水ラインＬ２１Ａには、海水系塩分濃度測定ラインＬ２３、海水系透過水排水ラインＬ２４が上流側から順に接続されている。また、海水系透過水ラインＬ２１Ａには、下流側端部に海水系透過水循環バルブ２５０が設けられている。海水系透過水ラインＬ２１Ａは、海水系透過水循環バルブ２５０を介して、海水系透過水循環ラインＬ２５に接続され、下水系逆浸透膜処理手段１０Ａに海水系透過水Ｗ２１を循環させる。 The seawater system permeated water line L <b> 21 </ b> A and the seawater system concentrated water line L <b> 22 are connected to the downstream side of the seawater system reverse osmosis membrane module 22. The seawater system permeated water line L21A is a line through which the seawater-based permeated water W21 having permeated through the RO membrane flows. A seawater-based salt concentration measurement line L23 and a seawater-based permeated water drainage line L24 are connected to the seawater system permeated water line L21A in this order from the upstream side. In the seawater system permeated water line L21A, a seawater system permeated water circulation valve 250 is provided at the downstream end. The seawater system permeated water line L21A is connected to the seawater system permeated water circulation line L25 via the seawater system permeated water circulation valve 250, and circulates the seawater system permeated water W21 to the lower water system reverse osmosis membrane treatment means 10A.
　海水系濃縮水ラインＬ２２は、ＲＯ膜を透過しなかった海水系濃縮水Ｗ２２が流通し、海水系濃縮水Ｗ２２を系外へ排水するラインである。海水系塩分濃度測定ラインＬ２３は、海水系透過水ラインＬ２１から塩分濃度測定ライン分岐点Ｊ２３において分岐し、海水系透過水Ｗ２１が流通し、塩分濃度測定手段としての海水系透過水ＥＣ計２３０に接続されている。海水系透過水ＥＣ計２３０は、塩分濃度測定工程として、海水系塩分濃度測定ラインＬ２３を流通する海水系透過水Ｗ２１の導電率を測定し、塩分濃度に換算する。海水系透過水ＥＣ計２３０は、制御手段１００Ａに接続され、測定した海水系透過水Ｗ２１の導電率又は換算した塩分濃度を制御手段１００Ａに送信する。 The seawater system concentrated water line L22 is a line through which the seawater-based concentrated water W22 which has not permeated the RO membrane flows, and which drains the seawater-based concentrated water W22 out of the system. The seawater system salinity measurement line L23 branches from the seawater system permeated water line L21 at the salinity measurement line branch point J23, and the seawater system permeated water W21 flows, and the seawater system permeated water EC meter 230 as a salinity concentration measuring means It is connected. The seawater system permeated water EC meter 230 measures the conductivity of the seawater-based permeate water W21 flowing through the seawater-based salt concentration measurement line L23 as a salinity concentration measurement step, and converts it to a salinity concentration. The seawater system permeated water EC meter 230 is connected to the control means 100A, and transmits the measured conductivity or converted salt concentration of the seawater system permeate water W21 to the control means 100A.
　海水系透過水排水ラインＬ２４は、海水系透過水ラインＬ２１から海水系透過水排水ライン分岐点Ｊ２４において分岐し、海水系透過水排水バルブ２４０を介して、海水系透過水Ｗ２１を供給系（図示無し）へ流出するラインである。海水系透過水排水バルブ２４０は、電磁弁又は電動弁からなり、制御手段１００Ａの制御により、海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしていれば、海水系透過水Ｗ２１を供給系へ流出するように構成され、海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしていない場合に、海水系透過水Ｗ２１を供給系へ流出するのを止めるように構成されている。 The seawater system permeated water drainage line L24 branches from the seawater system permeated water line L21 at the seawater system permeated water drainage line branch point J24, and the seawater system permeated water W21 is supplied through the seawater system permeated water drainage valve 240 (shown in FIG. It is a line that flows out to The seawater system permeated water drainage valve 240 is composed of a solenoid valve or a motorized valve, and under the control of the control means 100A, the seawater system permeated water W21 if the salt concentration of the seawater system permeated water W21 satisfies the standard that can flow out to the supply system. Configured to flow out to the supply system, and configured to stop flowing out the seawater-based permeate water W21 to the supply system when the salt concentration of the seawater-based permeate water W21 does not satisfy the standard that can be output to the supply system. It is done.
　海水系透過水循環ラインＬ２５は、海水系透過水循環バルブ２５０から延びて、下水ラインＬ１０の海水系透過水循環ライン接続点Ｊ２５に接続されている。海水系透過水循環ラインＬ２５は、海水系透過水Ｗ２１を下水系逆浸透膜処理手段１０Ａに循環させるラインである。海水系透過水循環バルブ２５０は、電磁弁又は電動弁からなり、制御手段１００Ａの制御により、海水系透過水Ｗ２１の塩分濃度が供給系（図示無し）へ流出できる基準を満たしていれば海水系透過水Ｗ２１を下水系逆浸透膜処理手段１０Ａに循環させないように構成され、海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしていない場合には海水系透過水Ｗ２１を下水系逆浸透膜処理手段１０Ａに循環させるように構成されている。 The seawater system permeated water circulation line L25 extends from the seawater system permeated water circulation valve 250 and is connected to the seawater system permeated water circulation line connection point J25 of the sewage line L10. The seawater system permeated water circulation line L25 is a line for circulating the seawater-based permeated water W21 to the lower water system reverse osmosis membrane treatment means 10A. The seawater system permeated water circulation valve 250 is composed of a solenoid valve or a motorized valve, and under the control of the control means 100A, the seawater system permeated if the salt concentration of the seawater system permeated water W21 satisfies the standard that can flow out to the supply system (not shown). The system is configured not to circulate the water W21 to the lower water system reverse osmosis membrane processing means 10A, and when the salt concentration of the seawater system permeate water W21 does not satisfy the standard that can flow out to the supply system, It is configured to be circulated to the osmotic membrane processing means 10A.
　制御手段１００Ａは、海水淡水化システム１Ａを構成する各要素のうち、制御が行われる要素に電気的に接続される。詳細には、制御手段１００Ａは、海水系透過水ＥＣ計２３０で測定された海水系透過水Ｗ２１の塩分濃度に応じて、加圧ポンプ１３、加圧ポンプ２３、海水系透過水排水バルブ２４０及び海水系透過水循環バルブ２５０を制御する。 The control means 100A is electrically connected to an element to be controlled among the elements constituting the seawater desalination system 1A. Specifically, the control unit 100A is configured to apply the pressure pump 13, the pressure pump 23, the seawater permeated water drain valve 240, and the like according to the salinity concentration of the seawater permeated water W21 measured by the seawater permeated water EC meter 230. The seawater system permeated water circulation valve 250 is controlled.
　次に、海水淡水化システム１Ａの動作について説明する。まず、制御手段１００Ａは、加圧ポンプ１３及び加圧ポンプ２３を駆動させる制御を行う。これにより、下水系逆浸透膜処理手段１０Ａが駆動し、系外から供給され下水系前処理モジュール１１により汚泥が除去された下水Ｗ１０は、下水系逆浸透膜モジュール１２に導入される。下水系逆浸透膜モジュール１２に導入された下水Ｗ１０は膜分離処理され、下水系透過水Ｗ１１及び下水系濃縮水Ｗ１２が生成される。下水系透過水Ｗ１１は系外に排水され、下水系濃縮水Ｗ１２は海水系逆浸透膜処理手段２０Ａに供給される。
　また、海水系逆浸透膜処理手段２０Ａが駆動し、系外から供給され海水系前処理モジュール２１により細菌、ウィルス、ＳＳ等が除去された海水Ｗ２０は、下水系逆浸透膜処理手段１０Ａから供給された下水系濃縮水Ｗ１２と混合され、海水系逆浸透膜モジュール２２に導入される。海水系逆浸透膜モジュール２２に導入された海水Ｗ２０と下水系濃縮水Ｗ１２との混合水は膜分離処理され、海水系透過水Ｗ２１及び海水系濃縮水Ｗ２２が生成される。海水系透過水Ｗ２１は海水系透過水ラインＬ２１Ａに流出され、海水系濃縮水Ｗ２２は系外に排水される。 Next, the operation of the seawater desalination system 1A will be described. First, the control unit 100A performs control to drive the pressure pump 13 and the pressure pump 23. Thereby, the lower water system reverse osmosis membrane treatment means 10A is driven, and the sewage W10 supplied from outside the system and from which the sludge is removed by the lower water system pretreatment module 11 is introduced to the lower water system reverse osmosis membrane module 12. The sewage W10 introduced into the lower water system reverse osmosis membrane module 12 is subjected to a membrane separation treatment to generate lower water system permeate water W11 and lower water system concentrated water W12. The lower water system permeate water W11 is drained to the outside of the system, and the lower water system concentrated water W12 is supplied to the seawater-based reverse osmosis membrane treatment means 20A.
In addition, seawater W20 driven by the seawater-based reverse osmosis membrane treatment means 20A and supplied from outside the system and from which bacteria, viruses, SS and the like have been removed by the seawater-based pretreatment module 21 is supplied from the lower water system reverse osmosis membrane treatment means 10A. The resultant mixture is mixed with the lower water system concentrated water W12 and introduced into the seawater-based reverse osmosis membrane module 22. The mixed water of the seawater W20 and the lower concentrated water W12 introduced into the seawater system reverse osmosis membrane module 22 is subjected to membrane separation treatment to generate a seawater-based permeate water W21 and a seawater-based concentrated water W22. The seawater system permeate water W21 flows out to the seawater system permeate water line L21A, and the seawater system concentrated water W22 is drained out of the system.
　そして、海水系透過水ＥＣ計２３０は、海水系透過水ラインＬ２１Ａに流出された海水系透過水Ｗ２１の塩分濃度を測定し制御手段１００に送信する。制御手段１００Ａは、継続決定工程として以下の処理を行う。制御手段１００Ａは、海水系透過水ＥＣ計２３０から送信された海水系透過水Ｗ２１の塩分濃度が供給系（図示無し）へ流出できる基準を満たしている場合には、海水系透過水排水バルブ２４０を開栓し、海水系透過水循環バルブ２５０を閉栓する制御を行う。これにより、海水系透過水Ｗ２１は、供給系へ流出される。 Then, the seawater-based permeated water EC meter 230 measures the salinity concentration of the seawater-based permeated water W21 that has flowed out to the seawater-based permeated water line L21A, and transmits it to the control means 100. The control means 100A performs the following processing as a continuation determination step. When the salt concentration of the seawater-based permeated water W21 transmitted from the seawater-based permeated water EC meter 230 satisfies the standard that can flow out to the supply system (not shown), the control means 100A controls the seawater-based permeated water drainage valve 240 Is controlled to close the seawater system permeated water circulation valve 250. Thus, the seawater-based permeated water W21 flows out to the supply system.
　また、制御手段１００Ａは、海水系透過水ＥＣ計２３０から送信された海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしていない場合には、海水系透過水循環工程として、海水系透過水循環バルブ２５０を開栓し、海水系透過水排水バルブ２４０を閉栓するとともに、加圧ポンプ２３の出力を下げることにより流量を下げる制御を行う。これにより、海水系透過水Ｗ２１は、海水系透過水循環ラインＬ２５を介して、下水系逆浸透膜処理手段１０Ａに循環され、再度、下水系逆浸透膜処理手段１０Ａ及び海水系逆浸透膜処理手段２０Ａにより膜分離処理される。また、海水系逆浸透膜処理手段２０において海水Ｗ２０を取水する量が減少する。 Further, when the salt concentration of the seawater-based permeated water W21 transmitted from the seawater-based permeated water EC meter 230 does not satisfy the standard that can flow out to the supply system, the control means 100A performs the seawater-based permeated water circulation process as the seawater-based permeated water circulation process. The permeated water circulation valve 250 is opened, the seawater system permeated water drain valve 240 is closed, and the output of the pressurizing pump 23 is reduced to control the flow rate to be reduced. Thereby, the seawater system permeated water W21 is circulated to the sewer system reverse osmosis membrane treatment means 10A via the seawater system permeate water circulation line L25, and again the seawater system reverse osmosis membrane treatment means 10A and the seawater system reverse osmosis membrane treatment means Membrane separation treatment is carried out by 20A. In addition, the amount of intake of seawater W 20 in seawater system reverse osmosis membrane processing means 20 is reduced.
　第１実施形態の海水淡水化システム１Ａによれば、以下の効果を奏する。
　海水系逆浸透膜処理手段２０Ａにおいて、海水Ｗ２０より塩分濃度が低い下水系濃縮水Ｗ１２と海水Ｗ２０の混合水を膜分離処理し淡水である海水系透過水Ｗ２１を生成するので、混合水より塩分濃度が高い海水Ｗ２０を膜分離処理して淡水を生成する場合に比べて、淡水を生成するためのエネルギーを低減できる。また、例えば、下水Ｗ１０の水量が低下し下水系逆浸透膜処理手段１０Ａで生成された下水系透過水Ｗ１１と下水系濃縮水Ｗ１２の水量が低下し、海水系透過水Ｗ２１の塩分濃度が上昇した場合であっても、稼働率が低下した下水系逆浸透膜処理手段１０Ａを利用して、当該塩分濃度が上昇した海水系透過水Ｗ２１を膜分離処理することで、塩分濃度が所定の濃度の海水系透過水Ｗ２１を供給できる。したがって、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において水質を確保できる海水淡水化システム１Ａを提供できる。 According to the seawater desalination system 1A of the first embodiment, the following effects can be obtained.
In the seawater system reverse osmosis membrane processing means 20A, the mixed water of the lower concentrated water W12 and the seawater W20 having a lower salinity concentration than the seawater W20 is subjected to membrane separation treatment to generate the seawater system permeate water W21 which is fresh water. The energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of seawater W20 having a high concentration. Also, for example, the water amount of the sewage W10 decreases, and the water amounts of the lower water system permeate water W11 and the lower water system concentrated water W12 generated by the lower water system reverse osmosis membrane treatment means 10A decrease, and the salinity concentration of the seawater system permeate water W21 increases. Even in the case of using the lower water system reverse osmosis membrane processing means 10A whose operating rate has decreased, the salt water concentration of the predetermined concentration can be obtained by subjecting the seawater-based permeate water W21 having the increased salinity concentration to membrane separation treatment. Seawater system permeate water W21 can be supplied. Therefore, while being able to reduce the energy for producing fresh water, seawater desalination system 1A which can secure water quality in the fresh water to produce can be provided.
　また、生成した淡水である海水系透過水Ｗ２１の塩分濃度に応じて、下水系逆浸透膜処理手段１０Ａ及び海水系逆浸透膜処理手段２０Ａを制御するので、例えば、海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしていない場合には、海水系逆浸透膜処理手段２０Ａの駆動を抑制し海水系透過水Ｗ２１の塩分濃度を所定の濃度に戻すことができる。 In addition, since the lower water system reverse osmosis membrane processing means 10A and the sea water type reverse osmosis membrane processing means 20A are controlled according to the salinity concentration of the generated freshwater seawater system permeate water W21, for example, the salinity of the seawater system permeate water W21 When the concentration does not satisfy the standard that can flow out to the supply system, it is possible to suppress the driving of the seawater system reverse osmosis membrane treatment means 20A and restore the salt concentration of the seawater system permeate water W21 to a predetermined concentration.
　また、下水系逆浸透膜処理手段１０Ａ及び海水系逆浸透膜処理手段２０Ａの流入量及び塩分濃度、予め設定される海水系逆浸透膜処理手段２０Ａが生成する海水系透過水Ｗ２１の水量及び塩分濃度から、好適な脱塩率の逆浸透膜を選択することで、エネルギー効率が好適なポンプ１３，２３を用いることが可能となり、淡水を生成するためのエネルギーをより低減できる。 Also, the inflow and salinity concentration of the lower water system reverse osmosis membrane processing means 10A and the seawater system reverse osmosis membrane processing means 20A, the water volume and salinity of the seawater system permeated water W21 generated by the seawater system reverse osmosis membrane processing means 20A set in advance. By selecting a reverse osmosis membrane with a suitable demineralization rate from the concentration, it is possible to use the pumps 13 and 23 with a suitable energy efficiency, and the energy for producing fresh water can be further reduced.
＜第２実施形態＞
　次に、本発明の第２実施形態について説明する。第２実施形態については、主として、第１実施形態とは異なる点を中心に説明し、第１実施形態と同様の構成については、同じ符号を付し、詳細な説明を省略する。第２実施形態において特に説明しない点は、第１実施形態についての説明が適宜適用される。 Second Embodiment
Next, a second embodiment of the present invention will be described. The second embodiment will be mainly described focusing on differences from the first embodiment, and the same configuration as the first embodiment will be assigned the same reference numeral and detailed description will be omitted. The description about the first embodiment is appropriately applied to points that are not particularly described in the second embodiment.
　図２を参照して、第２実施形態の海水淡水化システム１Ｂについて説明する。図２は、本発明の第２実施形態の海水淡水化システム１Ｂを示す概略構成図である。第２実施形態の海水淡水化システム１Ｂは、第１実施形態の海水淡水化システム１Ａとは、海水系逆浸透膜処理手段の海水ライン、海水系透過水ライン及び制御手段の構成が異なる。また、第２実施形態の海水淡水化システム１Ｂは、第１実施形態の海水淡水化システム１Ａが備えない第２海水系逆浸透膜処理手段３０を備える。海水淡水化システム１Ｂは、海水系透過水Ｗ２１の塩分濃度が、供給系（図示無し）へ流出できる基準を満たしている場合には海水系透過水Ｗ２１を供給系へ流出し、供給系へ流出できる基準を満たしていない場合は海水系透過水Ｗ２１を更に第２海水系逆浸透膜処理手段３０において膜分離処理する。 A seawater desalination system 1B according to a second embodiment will be described with reference to FIG. FIG. 2: is a schematic block diagram which shows the seawater desalination system 1B of 2nd Embodiment of this invention. The seawater desalination system 1B of the second embodiment differs from the seawater desalination system 1A of the first embodiment in the configurations of a seawater line, a seawater system permeated water line, and a control means of the seawater system reverse osmosis membrane treatment means. Moreover, the seawater desalination system 1B of 2nd Embodiment is provided with the 2nd seawater system reverse osmosis membrane process means 30 which the seawater desalination system 1A of 1st Embodiment does not have. The seawater desalination system 1B causes the seawater-based permeate water W21 to flow out to the supply system when the salt concentration of the seawater-based permeate water W21 satisfies the standard that can flow out to the supply system (not shown), and then flows out to the supply system. If it does not satisfy the criterion, the seawater-based permeated water W21 is further subjected to the membrane separation treatment in the second seawater-based reverse osmosis membrane treatment means 30.
　海水系逆浸透膜処理手段（第１海水系逆浸透膜処理手段）２０Ｂの海水ラインＬ２０Ｂは、海水淡水化システム１Ｂの系外から延びて海水系前処理モジュール２１を介して海水系逆浸透膜モジュール（第１海水系逆浸透膜モジュール）２２に接続されている。また、海水ラインＬ２０Ｂには、海水系前処理モジュール２１と海水系逆浸透膜モジュール２２との間の下水系濃縮水ライン接続点Ｊ１２で下水系濃縮水ラインＬ１２が接続され、下水系濃縮水ライン接続点Ｊ１２と海水系逆浸透膜モジュール２２との間の海水系再濃縮水ライン接続点Ｊ３２で海水系再濃縮水ラインＬ３２が接続されている。 The seawater line L20B of the seawater system reverse osmosis membrane treatment means (first seawater system reverse osmosis membrane treatment means) 20B extends from outside the seawater desalination system 1B and passes the seawater system pretreatment module 21 to the seawater system reverse osmosis membrane The module (first seawater system reverse osmosis membrane module) 22 is connected. In addition, the lower water system concentrated water line L12 is connected to the seawater line L20B at the lower water system concentrated water line connection point J12 between the seawater system pretreatment module 21 and the seawater system reverse osmosis membrane module 22, and the lower water system concentrated water line A seawater system reconcentrated water line L32 is connected at a seawater system reconcentrated water line junction point J32 between the connection point J12 and the seawater system reverse osmosis membrane module 22.
　海水系逆浸透膜処理手段２０Ｂの海水系透過水ラインＬ２１Ｂは、海水系逆浸透膜モジュール２２の下流側に接続されている。海水系透過水ラインＬ２１Ｂは、ＲＯ膜を透過した海水系透過水Ｗ２１が流通するラインである。海水系透過水ラインＬ２１Ｂには、海水系塩分濃度測定ラインＬ２３、海水系透過水排水ラインＬ２４が上流側から順に接続されている。また、海水系透過水ラインＬ２１Ｂには、下流側端部に海水系バルブ２１０が設けられている。海水系透過水ラインＬ２１Ｂは、海水系バルブ２１０を介して、第２海水系逆浸透膜処理手段３０に接続され、第２海水系逆浸透膜処理手段３０に海水系透過水Ｗ２１を供給する。 The seawater system permeated water line L21B of the seawater system reverse osmosis membrane treatment means 20B is connected to the downstream side of the seawater system reverse osmosis membrane module 22. The seawater system permeated water line L21B is a line through which the seawater-based permeated water W21 having permeated through the RO membrane flows. A seawater-based salt concentration measurement line L23 and a seawater-based permeated water drainage line L24 are connected to the seawater system permeated water line L21B in this order from the upstream side. A seawater system valve 210 is provided at the downstream end of the seawater system permeated water line L21B. The seawater system permeated water line L21B is connected to the second seawater system reverse osmosis membrane treatment means 30 via the seawater system valve 210, and supplies the seawater system permeated water W21 to the second seawater system reverse osmosis membrane treatment means 30.
　海水系バルブ２１０は、電磁弁又は電動弁からなり、制御手段１００Ｂの制御により、海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしていない場合には、海水系透過水Ｗ２１を第２海水系逆浸透膜処理手段３０に供給するように構成され、海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしている場合には、海水系透過水Ｗ２１を供給系へ流出するように構成されている。 The seawater system valve 210 is composed of a solenoid valve or a motorized valve, and under the control of the control means 100B, when the salt concentration of the seawater system permeate water W21 does not satisfy the standard that can flow out to the supply system, the seawater system permeate water W21 is used. The system is configured to be supplied to the second seawater-based reverse osmosis membrane processing means 30, and the seawater-based permeated water W21 is supplied to the supply system when the salt concentration of the seawater-based permeate water W21 satisfies the standard that can flow out to the supply system. It is configured to drain.
　第２海水系逆浸透膜処理手段３０は、海水系逆浸透膜処理手段２０Ｂから海水系透過水Ｗ２１を供給する海水系透過水供給ラインＬ３０と、海水系透過水供給ラインＬ３０に接続され、海水系透過水Ｗ２１を更に膜分離処理し、海水系再透過水Ｗ３１及び海水系再濃縮水Ｗ３２を生成する第２海水系逆浸透膜モジュール３２と、海水系透過水供給ラインＬ３０において、第２海水系逆浸透膜モジュール３２より上流側に設けられた加圧ポンプ３３と、第２海水系逆浸透膜モジュール３２に接続された海水系再透過水ラインＬ３１と、第２海水系逆浸透膜モジュール３２に接続された海水系再濃縮水ラインＬ３２と、を備える。 The second seawater system reverse osmosis membrane processing means 30 is connected to the seawater system permeate water supply line L30 for supplying the seawater system permeate water W21 from the seawater system reverse osmosis membrane process means 20B, and is connected to the seawater system permeate water supply line L30 In the second seawater system reverse osmosis membrane module 32 which further performs membrane separation treatment of the system permeate water W21 to generate seawater system repermeate water W31 and seawater system reconcentrated water W32, and in the seawater system permeate water supply line L30, second seawater A pressurized pump 33 provided on the upstream side of the reverse osmosis membrane module 32, a seawater system repermeate water line L31 connected to the second seawater system reverse osmosis module 32, and a second seawater system reverse osmosis membrane module 32 And a seawater system reconcentrated water line L 32 connected to
　海水系透過水供給ラインＬ３０は、海水系逆浸透膜処理手段２０Ｂの海水系バルブ２１０から延び第２海水系逆浸透膜モジュール３２に接続されており、海水系透過水Ｗ２１を第２海水系逆浸透膜モジュール３２に導入する。 The seawater system permeated water supply line L30 extends from the seawater system valve 210 of the seawater system reverse osmosis membrane processing means 20B and is connected to the second seawater system reverse osmosis membrane module 32, and the seawater system permeated water W21 It is introduced into the osmotic membrane module 32.
　第２海水系逆浸透膜モジュール３２は、海水系透過水供給ラインＬ３０の下流側に接続されている。第２海水系逆浸透膜モジュール３２は、塩分濃度が所定の基準値を超えている海水系透過水Ｗ２１を逆浸透膜により膜分離処理し、海水系再透過水Ｗ３１及び海水系再濃縮水Ｗ３２を生成する。第２海水系逆浸透膜モジュール３２は、単一又は複数のＲＯ膜エレメント（図示せず）を備えており、これらのＲＯ膜エレメントにより水中の溶存塩類を除去する。ＲＯ膜エレメントは、第２海水系逆浸透膜処理手段３０に流入する海水系透過水Ｗ２１の流入量及び塩分濃度、予め設定されている第２海水系逆浸透膜処理手段３０が生成する海水系再透過水Ｗ３１の水量及び塩分濃度に基づき好適な脱塩率の膜が選択される。加圧ポンプ３３は、海水系透過水供給ラインＬ３０に設けられており、海水系透過水Ｗ２１を加圧し、第２海水系逆浸透膜モジュール３２に送出する。 The second seawater-based reverse osmosis membrane module 32 is connected to the downstream side of the seawater-based permeated water supply line L30. The 2nd seawater system reverse osmosis membrane module 32 carries out the membrane separation treatment of seawater system permeated water W21 whose salinity concentration exceeds a predetermined standard value with a reverse osmosis membrane, and seawater system repermeate water W31 and seawater system reconcentrated water W32 Generate The second seawater-based reverse osmosis membrane module 32 includes one or more RO membrane elements (not shown), and these RO membrane elements remove dissolved salts in water. The RO membrane element is an inflow amount and salinity concentration of the seawater system permeated water W21 flowing into the second seawater system reverse osmosis membrane processing means 30, and a seawater system generated by the second seawater system reverse osmosis membrane processing means 30 set in advance. A membrane having a suitable desalting rate is selected based on the amount of water and the salinity concentration of the repermeated water W31. The pressurizing pump 33 is provided in the seawater-based permeated water supply line L30, pressurizes the seawater-based permeated water W21, and sends it to the second seawater-based reverse osmosis membrane module 32.
　海水系再透過水ラインＬ３１及び海水系再濃縮水ラインＬ３２は、第２海水系逆浸透膜モジュール３２の下流側に接続されている。海水系再透過水ラインＬ３１は、ＲＯ膜を透過した海水系再透過水Ｗ３１が流通し、海水系再透過水Ｗ３１を供給系（図示無し）へ流出するラインである。海水系再濃縮水ラインＬ３２は、ＲＯ膜を透過しなかった海水系再濃縮水Ｗ３２が流通するラインである。海水系再濃縮水ラインＬ３２は、海水系逆浸透膜処理手段２０Ｂに接続され、海水系逆浸透膜処理手段２０Ｂに海水系再濃縮水Ｗ３２を供給する。 The seawater system repermeate water line L31 and the seawater system reconcentrated water line L32 are connected to the downstream side of the second seawater system reverse osmosis membrane module 32. The seawater system repermeate water line L31 is a line through which the seawater system repermeate water W31 which has permeated the RO membrane flows and which flows out to the supply system (not shown). The seawater system reconcentrated water line L32 is a line through which the seawater reconcentrated water W32 which has not permeated the RO membrane flows. The seawater system reconcentrated water line L32 is connected to the seawater system reverse osmosis membrane processing means 20B, and supplies the seawater system reconcentrated membrane processing means 20B with the seawater system reconcentrated water W32.
　制御手段１００Ｂは、海水淡水化システム１Ｂを構成する各要素のうち、制御が行われる要素に電気的に接続される。詳細には、制御手段１００Ｂは、海水系透過水ＥＣ計２３０で測定された海水系透過水Ｗ２１の塩分濃度に応じて、加圧ポンプ１３、加圧ポンプ２３、加圧ポンプ３３、海水系バルブ２１０及び海水系透過水排水バルブ２４０を制御する。 The control means 100B is electrically connected to an element to be controlled among the elements constituting the seawater desalination system 1B. Specifically, the control unit 100B is configured to apply the pressure pump 13, the pressure pump 23, the pressure pump 33, and the seawater valve in accordance with the salinity concentration of the seawater system permeated water W21 measured by the seawater system permeated water EC meter 230. 210 and the seawater system permeated water drainage valve 240 are controlled.
　次に、海水淡水化システム１Ｂの動作について説明する。海水淡水化システム１Ｂにおける下水系透過水Ｗ１１及び海水系透過水Ｗ２１が生成されるまでの動作は、第１実施形態の海水淡水化システム１Ａと同様であるので説明を省略する。 Next, the operation of the seawater desalination system 1B will be described. The operation of the seawater desalination system 1B until the lower water system permeate water W11 and the seawater system permeate water W21 are generated is the same as that of the seawater desalination system 1A of the first embodiment, and thus the description thereof is omitted.
　海水系透過水ＥＣ計２３０は、海水系透過水ラインＬ２１Ｂに流出された海水系透過水Ｗ２１の塩分濃度を測定し制御手段１００Ｂに送信する。制御手段１００Ｂは、継続決定工程として以下の処理を行う。制御手段１００Ｂは、海水系透過水ＥＣ計２３０から送信された海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしている場合には、海水系透過水排水バルブ２４０を開栓し、海水系バルブ２１０を閉栓する制御を行う。これにより、海水系透過水Ｗ２１は、供給系へ流出される。 The seawater system permeated water EC meter 230 measures the salinity concentration of the seawater system permeated water W21 flowed out to the seawater system permeated water line L21B, and sends it to the control means 100B. The control means 100B performs the following processing as a continuation determination step. The control means 100B opens the seawater system permeate water drainage valve 240 when the salt concentration of the seawater system permeate W21 transmitted from the seawater system permeate water EC meter 230 satisfies the standard that can flow out to the supply system. , Control to close the seawater system valve 210. Thus, the seawater-based permeated water W21 flows out to the supply system.
　また、制御手段１００Ｂは、海水系透過水ＥＣ計２３０から送信された海水系透過水Ｗ２１の塩分濃度が供給系へ流出できる基準を満たしていない場合には、第２の海水系逆浸透膜処理工程として、海水系バルブ２１０を開栓するとともに、加圧ポンプ３３を駆動させ第２海水系逆浸透膜処理手段３０を駆動する制御を行う。これにより、海水系透過水Ｗ２１は、第２海水系逆浸透膜処理手段３０に供給される。供給された海水系透過水Ｗ２１は第２海水系逆浸透膜モジュール３２に導入され膜分離処理され、海水系再透過水Ｗ３１及び海水系再濃縮水Ｗ３２が生成される。海水系再透過水Ｗ３１は、供給系へ流出される。海水系再濃縮水Ｗ３２は、海水系濃縮水Ｗ２２と比べて塩分濃度が低いので、系外へ排水されず、海水系逆浸透膜処理手段２０Ｂに戻される。 Further, when the salt concentration of the seawater-based permeated water W21 transmitted from the seawater-based permeated water EC meter 230 does not satisfy the standard that can flow out to the supply system, the control means 100B performs the second seawater-based reverse osmosis membrane treatment As a process, while opening the seawater system valve | bulb 210, the control which drives the pressurization pump 33 and drives the 2nd seawater system reverse osmosis membrane process means 30 is performed. Thereby, seawater system permeated water W21 is supplied to the 2nd seawater system reverse osmosis membrane processing means 30. The supplied seawater-based permeated water W21 is introduced into the second seawater-based reverse osmosis membrane module 32 and subjected to membrane separation treatment to produce seawater-based repermeated water W31 and seawater-based reconcentrated water W32. The seawater system repermeate water W31 flows out to the supply system. Since the seawater system reconcentrated water W32 has a lower salinity concentration than the seawater system concentrated water W22, it is not drained to the outside of the system and returned to the seawater system reverse osmosis membrane processing means 20B.
　第２実施形態の海水淡水化システム１Ｂによれば、以下の効果を奏する。
　例えば、下水Ｗ１０の水量が低下し下水系逆浸透膜処理手段１０Ａで生成された下水系透過水Ｗ１１と下水系濃縮水Ｗ１２の水量が低下し、海水系透過水Ｗ２１の塩分濃度が上昇した場合であっても、第２海水系逆浸透膜処理手段３０で当該塩分濃度が上昇した海水系透過水Ｗ２１を膜分離処理することで、塩分濃度が基準を満たす海水系透過水Ｗ２１を供給できる。 According to the seawater desalination system 1B of the second embodiment, the following effects can be obtained.
For example, when the water content of the sewage W10 decreases and the water content of the lower water system permeate water W11 and the lower water system concentrated water W12 generated by the lower water system reverse osmosis membrane treatment means 10A decreases and the salt concentration of the seawater system water W21 increases. Even if the seawater system permeated water W21 whose salt concentration has risen is subjected to the membrane separation process by the second seawater system reverse osmosis membrane processing means 30, the seawater system permeate water W21 whose salt concentration meets the standard can be supplied.
＜第３実施形態＞
　次に、本発明の第３実施形態について説明する。第３実施形態については、主として、第１実施形態とは異なる点を中心に説明し、第１実施形態と同様の構成については、同じ符号を付し、詳細な説明を省略する。第３実施形態において特に説明しない点は、第１実施形態についての説明が適宜適用される。 Third Embodiment
Next, a third embodiment of the present invention will be described. The third embodiment will be mainly described focusing on differences from the first embodiment, and the same configuration as that of the first embodiment is denoted by the same reference numeral, and detailed description will be omitted. The description of the first embodiment is appropriately applied to points that are not particularly described in the third embodiment.
　図３を参照して、第３実施形態の海水淡水化システム１Ｃについて説明する。図３は、本発明の第３実施形態の海水淡水化システム１Ｃを示す概略構成図である。第３実施形態の海水淡水化システム１Ｃは、第１実施形態の海水淡水化システム１Ａとは、下水系逆浸透膜処理手段の下水系透過水ライン、海水系逆浸透膜処理手段の海水系透過水ライン及び制御手段の構成が異なる。また、第３実施形態の海水淡水化システム１Ｃは、第１実施形態の海水淡水化システム１Ａが備えない貯留システム４０を備える。 With reference to FIG. 3, the seawater desalination system 1C of 3rd Embodiment is demonstrated. FIG. 3: is a schematic block diagram which shows the seawater desalination system 1C of 3rd Embodiment of this invention. The seawater desalination system 1C according to the third embodiment is the same as the seawater desalination system 1A according to the first embodiment except that the lower water system permeate water line of the lower water system reverse osmosis membrane processing means, the seawater system permeation of the sea water reverse osmosis membrane processing means The configurations of the water line and the control means are different. Moreover, the seawater desalination system 1C of 3rd Embodiment is provided with the storage system 40 which the seawater desalination system 1A of 1st Embodiment does not have.
　下水系逆浸透膜処理手段１０Ｃの下水系透過水ラインＬ１１Ｃは、下水系逆浸透膜モジュール１２の下流側に接続されている。下水系透過水ラインＬ１１Ｃは、ＲＯ膜を透過した下水系透過水Ｗ１１が流通するラインである。下水系透過水ラインＬ１１Ｃには、下水系塩分濃度測定ラインＬ１３及び貯留システム４０が上流側から順に接続され、貯留システム４０に下水系透過水Ｗ１１を供給する。下水系塩分濃度測定ラインＬ１３は、下水系透過水ラインＬ１１Ａから塩分濃度測定ライン分岐点Ｊ１３において分岐し、下水系透過水Ｗ１１が流通し、第２の塩分濃度測定手段としての下水系透過水ＥＣ計１３０に接続されている。下水系透過水ＥＣ計１３０は、第２の塩分濃度測定工程として、下水系塩分濃度測定ラインＬ１３を流通する下水系透過水Ｗ１１の導電率を測定し、塩分濃度に換算する。下水系透過水ＥＣ計１３０は、制御手段１００Ｃに接続され、測定した下水系透過水Ｗ１１の導電率又は換算した塩分濃度を制御手段１００Ｃに送信する。 The lower water system permeated water line L11C of the lower water system reverse osmosis membrane treatment means 10C is connected to the downstream side of the lower water system reverse osmosis membrane module 12. The lower water system permeated water line L11C is a line through which the lower water system permeated water W11 having permeated through the RO membrane flows. In the lower water system permeated water line L11C, the lower water system salt concentration measurement line L13 and the storage system 40 are connected in order from the upstream side, and the lower water system permeate water W11 is supplied to the storage system 40. The lower water system salt concentration measurement line L13 branches from the lower water system permeate water line L11A at the salinity measurement line branch point J13, the lower water system permeate water W11 flows, and the lower water system permeate water EC as a second salt concentration measurement means A total of 130 are connected. In the lower water system permeated water EC meter 130, the conductivity of the lower water system permeate water W11 flowing through the lower water system salt concentration measurement line L13 is measured as the second salt concentration measurement step, and converted to the salt concentration. The lower water system permeated water EC meter 130 is connected to the control means 100C, and transmits the measured conductivity or the converted salt concentration of the lower water system permeated water W11 to the control means 100C.
　海水系逆浸透膜処理手段２０Ｃの海水系透過水ラインＬ２１Ｃは、海水系逆浸透膜モジュール２２の下流側に接続されている。海水系透過水ラインＬ２１Ｃは、ＲＯ膜を透過した海水系透過水Ｗ２１が流通するラインである。海水系透過水ラインＬ２１Ｃには、海水系塩分濃度測定ラインＬ２３及び貯留システム４０が上流側から順に接続され、貯留システム４０に海水系透過水Ｗ２１を供給する。海水系塩分濃度測定ラインＬ２３は、海水系透過水ラインＬ２１Ｃから塩分濃度測定ライン分岐点Ｊ２３において分岐し、海水系透過水Ｗ２１が流通し、第３の塩分濃度測定手段としての海水系透過水ＥＣ計２３０に接続されている。海水系透過水ＥＣ計２３０は、第３の塩分濃度測定工程として、海水系塩分濃度測定ラインＬ２３を流通する海水系透過水Ｗ２１の導電率を測定し、塩分濃度に換算する。海水系透過水ＥＣ計２３０は、制御手段１００Ｃに接続され、測定した海水系透過水Ｗ２１の導電率又は換算した塩分濃度を制御手段１００Ｃに送信する。 The seawater system permeated water line L21C of the seawater system reverse osmosis membrane treatment means 20C is connected to the downstream side of the seawater system reverse osmosis membrane module 22. The seawater system permeated water line L21C is a line through which the seawater-based permeated water W21 having permeated through the RO membrane flows. A seawater-based salt concentration measurement line L23 and a storage system 40 are connected to the seawater system permeated water line L21C in order from the upstream side, and the seawater system permeated water W21 is supplied to the storage system 40. The seawater system salinity measurement line L23 branches from the seawater system permeated water line L21C at the salinity measurement line branch point J23, and the seawater system permeated water W21 flows, and the seawater system permeated water EC as a third salinity concentration measuring means A total of 230 are connected. The seawater system permeated water EC meter 230 measures the conductivity of the seawater-based permeated water W21 flowing through the seawater-based salt concentration measurement line L23 as the third salinity concentration measurement step, and converts it to the salinity concentration. The seawater system permeated water EC meter 230 is connected to the control means 100C, and transmits the measured conductivity of the seawater system permeate water W21 or the converted salt concentration to the control means 100C.
　貯留システム４０は、下水系逆浸透膜処理手段１０Ｃの下水系透過水ラインＬ１１Ｃ及び海水系逆浸透膜処理手段２０Ｃの海水系透過水ラインＬ２１Ｃに接続された貯留槽４１と、貯留槽４１に接続された貯留槽排水ラインＬ４１と、貯留槽４１の水位を計測する水位計４２と、貯留槽４１に接続された貯留槽塩分濃度測定ラインＬ４３と、貯留槽塩分濃度測定ラインＬ４３に接続された第１の塩分濃度測定手段としての貯留槽ＥＣ計４３０と、を備える。 The storage system 40 is connected to the storage tank 41 connected to the lower water system permeated water line L11C of the lower water system reverse osmosis membrane processing means 10C and the seawater system permeated water line L21C of the seawater system reverse osmosis membrane processing means 20C, and to the storage tank 41 Storage tank drain line L41, a water level gauge 42 for measuring the water level of the storage tank 41, a storage tank salt concentration measurement line L43 connected to the storage tank 41, and a reservoir tank concentration measurement line L43 connected And a reservoir EC meter 430 as a salinity concentration measurement unit.
　貯留槽４１は、下水系逆浸透膜処理手段１０Ｃから供給された下水系透過水Ｗ１１と海水系逆浸透膜処理手段２０Ｃから供給された海水系透過水Ｗ２１とが混合された混合透過水Ｗ４０を貯留する。貯留槽排水ラインＬ４１は、貯留槽４１の底部に接続され、混合透過水Ｗ４０を供給系（図示無し）へ流出するラインである。水位計４２は、貯留槽４１に貯留された混合透過水Ｗ４１の水位を計測する。水位計４２は、制御手段１００Ｃに接続され、計測した混合透過水Ｗ４０の水位を制御手段１００Ｃに送信する。水位計４２は、貯留槽４１の底部に配置され水圧を検出する圧力センサを備え、水圧の変化から水位を測定する圧力式水位計であるが、これに限らず、光学式水位計や超音波式水位計を用いることができる。 The storage tank 41 is a mixed permeated water W40 in which the lower water system permeate water W11 supplied from the lower water system reverse osmosis membrane treatment means 10C and the seawater system permeate water W21 supplied from the seawater system reverse osmosis membrane treatment means 20C are mixed. Retain. The storage tank drainage line L41 is a line connected to the bottom of the storage tank 41 and flowing out the mixed permeated water W40 to a supply system (not shown). The water level gauge 42 measures the water level of the mixed permeated water W41 stored in the storage tank 41. The water level gauge 42 is connected to the control means 100C, and transmits the measured water level of the mixed permeated water W40 to the control means 100C. The water level gauge 42 is a pressure type water level gauge which is disposed at the bottom of the storage tank 41 and has a pressure sensor for detecting water pressure and measures the water level from changes in water pressure, but not limited thereto. A water gauge can be used.
　貯留槽塩分濃度測定ラインＬ４３は、貯留槽４１の底部の近傍まで延び、混合透過水Ｗ４０が流通し、貯留槽ＥＣ計４３０に接続されている。貯留槽ＥＣ計４３０は、第１の塩分濃度測定工程として、貯留槽塩分濃度測定ラインＬ４３を流通する混合透過水Ｗ４０の導電率を測定し、塩分濃度に換算する。貯留槽ＥＣ計４３０は、制御手段１００Ｃに接続され、測定した混合透過水Ｗ４０の導電率又は換算した塩分濃度を制御手段１００Ｃに送信する。 The storage tank salt concentration measurement line L43 extends to the vicinity of the bottom of the storage tank 41, the mixed permeated water W40 flows, and is connected to the storage tank EC meter 430. The storage tank EC meter 430 measures the conductivity of the mixed permeated water W40 flowing through the storage tank salinity measurement line L43 as the first salinity concentration measurement step, and converts it to the salinity concentration. The storage tank EC meter 430 is connected to the control means 100C, and transmits the measured conductivity or mixed salt concentration of the mixed permeated water W40 to the control means 100C.
　制御手段１００Ｃは、海水淡水化システム１Ｃを構成する各要素のうち、制御が行われる要素に電気的に接続される。詳細には、制御手段１００Ｃは、水位計４２で計測された混合透過水Ｗ４０の水位、下水系透過水ＥＣ計１３０で測定された下水系透過水Ｗ１１の塩分濃度、海水系透過水ＥＣ計２３０で測定された海水系透過水Ｗ２１の塩分濃度又は貯留槽ＥＣ計４３０で測定された混合透過水Ｗ４０の塩分濃度に応じて、加圧ポンプ１３又は加圧ポンプ２３を制御する。 The control means 100C is electrically connected to an element to be controlled among the elements constituting the seawater desalination system 1C. In detail, the control means 100 C controls the water level of the mixed permeated water W 40 measured by the water level gauge 42, the salinity concentration of the lower water system permeated water W 11 measured by the sewerage system permeated water EC meter 130, and the seawater system permeated water EC meter 230. The pressure pump 13 or the pressure pump 23 is controlled in accordance with the salinity concentration of the seawater-based permeated water W21 measured in the above or the salinity concentration of the mixed permeated water W40 measured by the storage tank EC meter 430.
　次に、海水淡水化システム１Ｃの動作について説明する。海水淡水化システム１Ｃにおける下水系透過水Ｗ１１及び海水系透過水Ｗ２１が生成されるまでの動作は、第１実施形態の海水淡水化システム１Ａと同様であるので説明を省略する。下水系逆浸透膜処理手段１０Ｃで生成された下水系透過水Ｗ１１及び海水系逆浸透膜処理手段２０Ｃで生成された海水系透過水Ｗ２１は、混合され混合透過水Ｗ４０となって貯留システム４０の貯留槽４１に貯留される。貯留槽４１に貯留された混合透過水Ｗ４０は貯留槽排水ラインＬ４１より供給系へ流出されるが、下水系透過水Ｗ１１及び海水系透過水Ｗ２１の生成量（混合透過水Ｗ４０の生成量）が混合透過水Ｗ４０の排水量より大きい場合、貯留槽４１に混合透過水Ｗ４０が貯留される。そして、水位計４２は、貯留槽４１に貯留された混合透過水Ｗ４０の水位を測定し制御手段１００Ｃに送信する。 Next, the operation of the seawater desalination system 1C will be described. The operation of the seawater desalination system 1C until the lower water system permeate water W11 and the seawater system permeate water W21 are generated is the same as that of the seawater desalination system 1A of the first embodiment, and thus the description thereof is omitted. The lower water system permeate water W11 generated by the lower water system reverse osmosis membrane treatment means 10C and the seawater system permeate water W21 generated by the sea water system reverse osmosis membrane treatment means 20C are mixed and become the mixed permeate water W40 in the storage system 40. It is stored in the storage tank 41. The mixed permeated water W40 stored in the storage tank 41 flows out to the supply system from the storage tank drainage line L41, but the generation amounts of the lower water system permeate water W11 and the seawater system permeate water W21 (the generation amount of the mixed permeate water W40) When it is larger than the amount of drainage of the mixed permeated water W40, the mixed permeated water W40 is stored in the storage tank 41. And the water level gauge 42 measures the water level of the mixed permeated water W40 stored by the storage tank 41, and transmits to the control means 100C.
　制御手段１００Ｃは、決定工程として、以下の処理を行う。
　制御手段１００Ｃは、水位計４２から送信された混合透過水Ｗ４０の水位が所定の海水系逆浸透膜処理手段停止水位に達した場合には、加圧ポンプ２３を停止し海水系逆浸透膜処理手段２０Ｃの駆動を停止する。これにより、海水淡水化システム１Ｃは、下水系逆浸透膜処理手段１０Ｃのみが駆動している状態となり、貯留槽４１には下水系透過水Ｗ１１のみが供給されることとなる。 The control unit 100C performs the following processing as a determination step.
When the water level of the mixed permeated water W40 transmitted from the water level gauge 42 reaches a predetermined seawater system reverse osmosis membrane processing means stop water level, the control means 100C stops the pressurizing pump 23 and treats the seawater system reverse osmosis membrane treatment The driving of the means 20C is stopped. As a result, in the seawater desalination system 1C, only the lower water system reverse osmosis membrane processing means 10C is driven, and only the lower water system permeated water W11 is supplied to the storage tank 41.
　そして、例えば、下水系透過水Ｗ１１の生成量（混合透過水Ｗ４０の生成量）が混合透過水Ｗ４０の排水量より小さくなった場合、貯留槽４１における混合透過水Ｗ４０の水位は降下する。制御手段１００Ｃは、水位計４２から送信された混合透過水Ｗ４０の水位が所定の海水系逆浸透膜処理手段開始水位に達した場合には、加圧ポンプ２３を駆動し海水系逆浸透膜処理手段２０Ｃを起動する。なお、所定の海水系逆浸透膜処理手段開始水位は、所定の海水系逆浸透膜処理手段停止水位より低い位置に設定されている。これにより、海水淡水化システム１Ｃは、再び下水系逆浸透膜処理手段１０Ｃ及び海水系逆浸透膜処理手段２０Ｃが駆動している状態となり、貯留槽４１には下水系透過水Ｗ１１及び海水系透過水Ｗ２１が供給されることとなる。 Then, for example, when the production amount of the lower water system permeate water W11 (the generation amount of the mixed permeate water W40) becomes smaller than the drainage amount of the mixed permeate water W40, the water level of the mixed permeate water W40 in the storage tank 41 falls. When the water level of the mixed permeated water W40 transmitted from the water level gauge 42 reaches a predetermined seawater system reverse osmosis membrane processing means start water level, the control means 100C drives the pressurizing pump 23 to process the seawater system reverse osmosis membrane treatment Activate the means 20C. In addition, a predetermined seawater system reverse osmosis membrane process means start water level is set to a position lower than a predetermined seawater system reverse osmosis membrane process means stop water level. As a result, the seawater desalination system 1C is driven again by the lower water system reverse osmosis membrane treatment means 10C and the seawater system reverse osmosis membrane treatment means 20C, and the storage tank 41 receives the lower water system permeate water W11 and the seawater system permeation. Water W21 will be supplied.
　一方、例えば、下水系透過水Ｗ１１の生成量（混合透過水Ｗ４０の生成量）が混合透過水Ｗ４０の排水量より大きい場合、貯留槽４１における混合透過水Ｗ４０の水位は更に上昇する。制御手段１００Ｃは、水位計４２から送信された混合透過水Ｗ４０の水位が所定の全逆浸透膜処理手段停止水位に達した場合には、加圧ポンプ１３及び加圧ポンプ２３を停止し下水系逆浸透膜処理手段１０Ａ及び海水系逆浸透膜処理手段２０Ｃの駆動を停止する。なお、全逆浸透膜処理手段停止水位は、所定の海水系逆浸透膜処理手段停止水位より高い位置に設定されている。これにより、海水淡水化システム１Ｃは、下水系逆浸透膜処理手段１０Ｃ及び海水系逆浸透膜処理手段２０Ｃの双方が停止した全停止状態となり、貯留槽４１がオーバーフローするのを防止できる。そして、この全停止状態において、制御手段１００Ｃは、水位計４２から送信された混合透過水Ｗ４０の水位が降下し所定の海水系逆浸透膜処理手段停止水位に達した場合には、加圧ポンプ１３の駆動を再開し下水系逆浸透膜処理手段１０Ｃを起動する。 On the other hand, for example, when the production amount of the lower water system permeate water W11 (the generation amount of the mixed permeate water W40) is larger than the drainage amount of the mixed permeate water W40, the water level of the mixed permeate water W40 in the storage tank 41 further rises. When the water level of the mixed permeated water W40 transmitted from the water level gauge 42 reaches the predetermined total reverse osmosis membrane processing means stop water level, the control means 100C stops the pressure pump 13 and the pressure pump 23, and the lower water system The driving of the reverse osmosis membrane processing means 10A and the seawater system reverse osmosis membrane processing means 20C is stopped. The total reverse osmosis membrane treatment means stop water level is set to a position higher than a predetermined seawater system reverse osmosis membrane treatment means stop water level. Thereby, the seawater desalination system 1C is in a total stop state where both the lower water system reverse osmosis membrane processing means 10C and the seawater system reverse osmosis membrane processing means 20C are stopped, and the reservoir 41 can be prevented from overflowing. Then, in this total stop state, when the water level of the mixed permeated water W40 transmitted from the water level gauge 42 falls and reaches a predetermined seawater system reverse osmosis membrane processing means stop water level, the control means 100C is a pressurizing pump 13. The driving of the lower water system reverse osmosis membrane processing means 10C is started by resuming the driving of 13.
　また、制御手段１００Ｃは、下水系透過水ＥＣ計１３０で測定された下水系透過水Ｗ１１の塩分濃度、海水系透過水ＥＣ計２３０で測定された海水系透過水Ｗ２１の塩分濃度又は貯留槽ＥＣ計４３０で測定された混合透過水Ｗ４０の塩分濃度のいずれかが供給系へ流出できる基準を満たしていない場合には、加圧ポンプ２３を停止させ海水系逆浸透膜処理手段２０Ｃを停止する制御を行う。これにより、海水淡水化システム１Ｃは、下水系逆浸透膜処理手段１０Ｃのみが駆動している状態となり、貯留槽４１には下水系透過水Ｗ１１のみが供給されることとなる。 In addition, the control means 100C is the salinity concentration of the lower water system permeate water W11 measured by the lower water system permeated water EC meter 130, the salinity concentration of the seawater system permeate water W21 measured by the seawater system permeated water EC meter 230, or the storage tank EC. When any of the salinity concentrations of the mixed permeated water W40 measured by the total 430 does not satisfy the standard that can flow out to the supply system, the control to stop the pressurizing pump 23 and stop the seawater system reverse osmosis membrane processing means 20C I do. As a result, in the seawater desalination system 1C, only the lower water system reverse osmosis membrane processing means 10C is driven, and only the lower water system permeated water W11 is supplied to the storage tank 41.
　第３実施形態の海水淡水化システム１Ｃによれば、以下の効果を奏する。
　海水系逆浸透膜処理手段２０Ｃにおいて、海水Ｗ２０より塩分濃度が低い下水系濃縮水Ｗ１２と海水Ｗ２０の混合水を膜分離処理し淡水である海水系透過水Ｗ２１を生成するので、混合水より塩分濃度が高い海水Ｗ２０を膜分離処理して淡水を生成する場合に比べて、淡水を生成するためのエネルギーを低減できる。また、生成した淡水である下水系透過水Ｗ１１と海水系透過水Ｗ２１とが混合された混合透過水Ｗ４０の貯留槽４１における水位に応じて海水系逆浸透膜処理手段２０Ｃを、起動又は停止するので、例えば、下水系透過水Ｗ１１が十分に生成され、所望の水量が確保できている場合に、下水系逆浸透膜処理手段１０Ｃに比べ多くのエネルギーを必要とする海水系逆浸透膜処理手段２０Ｃを停止できる。したがって、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において所望の水量を確保できる海水淡水化システム１Ｃを提供できる。 According to the seawater desalination system 1C of the third embodiment, the following effects can be obtained.
In the seawater system reverse osmosis membrane treatment means 20C, mixed water of the lower concentrated water W12 and the seawater W20 having a lower salinity concentration than the seawater W20 is subjected to membrane separation treatment to generate seawater-based permeate water W21 which is fresh water. The energy for producing fresh water can be reduced as compared to the case of producing fresh water by membrane separation treatment of seawater W20 having a high concentration. The seawater system reverse osmosis membrane processing means 20C is activated or stopped according to the water level in the storage tank 41 of the mixed permeated water W40 in which the generated freshwater permeate water W11 and seawater system permeate water W21 are mixed. Therefore, for example, a seawater-based reverse osmosis membrane treatment means which requires more energy than the lower water-system reverse osmosis membrane treatment means 10C when the lower water-system permeated water W11 is sufficiently generated and the desired water volume can be secured. Can stop 20C. Therefore, while being able to reduce the energy for producing fresh water, the desalination system 1C which can secure desired water volume in the fresh water to produce can be provided.
　また、海水系逆浸透膜処理手段２０Ｃは、海水系透過水Ｗ２１の塩分濃度、下水系透過水Ｗ１１の塩分濃度及び混合透過水Ｗ４０の塩分濃度に応じて、起動又は停止するので、例えば、下水系透過水Ｗ１１の塩分濃度及び混合透過水Ｗ４０の塩分濃度のいずれかが所定の基準値より高ければ、海水系逆浸透膜処理手段２０Ｃを停止することで、生成した淡水である混合透過水Ｗ４０の塩分濃度を基準に戻すことができる。したがって、淡水を生成するためのエネルギーを低減できるとともに、生成する淡水において水質を確保できる海水淡水化システム１Ｃを提供できる。 In addition, since the seawater-based reverse osmosis membrane processing means 20C starts or stops depending on the salt concentration of the seawater-based permeate water W21, the salt concentration of the lower water-system permeate water W11, and the salt concentration of the mixed permeate water W40, for example, If either the salinity concentration of the aqueous permeate water W11 or the salinity concentration of the mixed permeate water W40 is higher than a predetermined reference value, the mixed permeate water W40 which is the generated fresh water by stopping the seawater-based reverse osmosis membrane treatment means 20C. Salinity can be returned to the standard. Therefore, while being able to reduce the energy for producing fresh water, seawater desalination system 1C which can secure water quality in the fresh water to produce can be provided.
　本発明は、上述した実施の形態に限らず、本発明の要旨を逸脱しない範囲で種々変形可能である。 The present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the scope of the present invention.
　１Ａ，１Ｂ，１Ｃ　海水淡水化システム
　１０Ａ，１０Ｃ　下水系逆浸透膜処理手段
　２０Ａ，２０Ｂ，２０Ｃ　海水系逆浸透膜処理手段
　１００Ａ，１００Ｂ，１００Ｃ　制御手段
　２３０　海水系透過水ＥＣ計
　Ｗ１０　下水
　Ｗ１１　下水系透過水
　Ｗ１２　下水系濃縮水
　Ｗ２０　海水
　Ｗ２１　海水系透過水
　Ｗ２２　海水系濃縮水 1A, 1B, 1C seawater desalination system 10A, 10C lower water system reverse osmosis membrane treatment means 20A, 20B, 20C marine water reverse osmosis membrane treatment means 100A, 100B, 100C control means 230 sea water permeated water EC meter W10 sewage W11 lower water system Permeate water W12 Lower water system concentrated water W20 Sea water W21 Sea water system permeate water W22 Sea water system concentrated water

Claims (13)

  1. 　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理手段と、
    　前記下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成し、前記海水系透過水の塩分濃度を測定する塩分濃度測定手段を有する海水系逆浸透膜処理手段と、を備え、
    　前記塩分濃度測定手段で測定した前記海水系透過水の塩分濃度に応じて前記海水系透過水を前記下水系逆浸透膜処理手段に供給する
    　ことを特徴とする海水淡水化システム。     A sewerage system reverse osmosis membrane treatment means for producing sewerage permeated water and sewerage water concentrate by membrane separation treatment of sewage,
    A method of producing a salinity concentration measuring means for producing seawater-based permeated water and seawater-based concentrated water by membrane separation treatment of mixed water of the lower water system concentrated water and the intake seawater, and measuring the salinity concentration of the seawater-based permeate water And seawater seawater reverse osmosis membrane treatment means,
    A seawater desalination system, comprising: supplying the seawater-based permeated water to the sewer system reverse osmosis membrane treating means according to the salt concentration of the seawater-based permeated water measured by the salt concentration measuring means.
  2. 　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理手段を有する海水淡水化システムであって、
    　前記下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成し、前記海水系透過水の塩分濃度を測定する塩分濃度測定手段を有する海水系逆浸透膜処理手段と、
    　前記塩分濃度測定手段で測定した前記海水系透過水の塩分濃度に応じて、前記下水系逆浸透膜処理手段及び前記海水系逆浸透膜処理手段の駆動を制御する制御手段と、
    　を備えることを特徴とする海水淡水化システム。     A seawater desalination system having a sewerage system reverse osmosis membrane treatment means for producing sewerage permeated water and sewerage water concentrate by membrane separation treatment of sewage,
    A method of producing a salinity concentration measuring means for producing seawater-based permeated water and seawater-based concentrated water by membrane separation treatment of mixed water of the lower water system concentrated water and the intake seawater, and measuring the salinity concentration of the seawater-based permeate water Seawater system reverse osmosis membrane treatment means,
    Control means for controlling the driving of the lower water system reverse osmosis membrane treatment means and the seawater type reverse osmosis membrane treatment means according to the salinity concentration of the seawater system permeated water measured by the salinity concentration measurement means;
    Desalination system characterized by having.
  3. 　前記海水系透過水を膜分離処理する第２の海水系逆浸透膜処理手段を更に備え、
    　前記制御手段は、前記塩分濃度測定手段で測定した前記海水系透過水の塩分濃度に応じて前記海水系透過水を前記第２の海水系逆浸透膜処理手段に供給する
    　ことを特徴とする請求項２に記載の海水淡水化システム。     The system further comprises a second seawater system reverse osmosis membrane treatment means for subjecting the seawater system permeated water to membrane separation treatment,
    The control means supplies the seawater-based permeated water to the second seawater-based reverse osmosis membrane treatment means according to the salinity concentration of the seawater-based permeate water measured by the salinity concentration measurement means. The seawater desalination system of Claim 2.
  4. 　前記制御手段は、前記塩分濃度測定手段で測定した海水系透過水の塩分濃度に応じて、前記海水系透過水を前記下水系逆浸透膜処理手段に供給し、
    　前記下水系逆浸透膜処理手段は、前記海水系逆浸透膜処理手段から供給された前記海水系透過水と下水との混合水を膜分離処理する
    　ことを特徴とする請求項２に記載の海水淡水化システム。     The control means supplies the seawater-based permeated water to the lower water system reverse osmosis membrane treatment means according to the salt concentration of the seawater-based permeated water measured by the salt concentration measuring means,
    3. The seawater according to claim 2, wherein the lower water system reverse osmosis membrane treatment means performs membrane separation treatment of the mixed water of the seawater system permeated water and the sewage supplied from the seawater system reverse osmosis membrane treatment means. Desalination system.
  5. 　前記海水系逆浸透膜処理手段が備える逆浸透膜は、前記下水系逆浸透膜処理手段に流入する下水の流入量及び塩分濃度、前記海水系逆浸透膜処理手段に流入する海水の流入量及び塩分濃度、予め設定される前記海水系逆浸透膜処理手段が生成する海水系透過水の水量及び塩分濃度に基づき選択された、好適な脱塩率の逆浸透膜である
    　ことを特徴とする請求項２から請求項４のいずれか一項に記載の海水淡水化システム。     The reverse osmosis membrane provided in the seawater-based reverse osmosis membrane treatment means includes the inflow and salinity of the sewage flowing into the lower water system reverse osmosis membrane treatment means, the inflow of seawater flowing into the seawater-based reverse osmosis membrane treatment means, and It is a reverse osmosis membrane with a suitable demineralization rate, which is selected based on the salinity concentration, the water content and salinity concentration of seawater-based permeated water generated by the seawater-based reverse osmosis membrane treatment means set in advance. The seawater desalination system as described in any one of claim 2 to claim 4.
  6. 　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理手段と、
    　海水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する海水系逆浸透膜処理手段と、
    　前記下水系透過水と前記海水系透過水とが混合された混合透過水を貯留する貯留槽及び当該貯留槽に貯留された混合透過水の水位を計測する水位計を有する貯留システムと、を備え、
    　前記貯留システムは、前記水位計で計測した水位に応じて前記海水系逆浸透膜処理手段を、起動又は停止する
    　ことを特徴とする海水淡水化システム。     A sewerage system reverse osmosis membrane treatment means for producing sewerage permeated water and sewerage water concentrate by membrane separation treatment of sewage,
    Seawater-based reverse osmosis membrane treatment means for producing seawater-based permeated water and seawater-based concentrated water by subjecting seawater to membrane separation treatment,
    A storage tank for storing mixed permeated water in which the lower water system permeated water and the seawater-based permeated water are mixed, and a storage system having a water level gauge for measuring the water level of the mixed permeated water stored in the storage tank. ,
    The said storage system starts or stops the said seawater system reverse osmosis membrane process means according to the water level measured with the said water level gauge. The seawater desalination system characterized by the above-mentioned.
  7. 　前記貯留システムは、前記貯留槽に貯留された混合透過水の塩分濃度を測定する第１の塩分濃度測定手段を有し、
    　前記下水系逆浸透膜処理手段は、生成した下水系透過水の塩分濃度を測定する第２の塩分濃度測定手段を有し、
    　前記海水系逆浸透膜処理手段は、生成した海水系透過水の塩分濃度を測定する第３の塩分濃度測定手段を有し、前記海水系透過水の塩分濃度、前記下水系透過水の塩分濃度及び前記混合透過水の塩分濃度に応じて、起動又は停止する
    　ことを特徴とする請求項６に記載の海水淡水化システム。     The storage system has a first salinity measurement means for measuring the salinity concentration of the mixed permeated water stored in the storage tank,
    The lower water system reverse osmosis membrane treatment means has a second salinity measurement means for measuring the salinity concentration of the generated lower water system permeated water,
    The seawater system reverse osmosis membrane treatment means has a third salinity concentration measurement means for measuring the salinity concentration of the generated seawater system permeate, and the salinity concentration of the seawater system permeate, and the salinity concentration of the sewer system permeate water And it starts or stops according to the salinity concentration of the said mixed permeated water. The seawater desalination system of Claim 6 characterized by the above-mentioned.
  8. 　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理工程と、
    　前記下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する海水系逆浸透膜処理工程と、
    　前記海水系透過水の塩分濃度を測定する塩分濃度測定工程と、
    　前記海水系透過水の塩分濃度に応じて前記海水系透過水を前記下水系逆浸透膜処理工程に戻す海水系透過水循環工程と、
    　を備えることを特徴とする海水淡水化方法。     A downstream reverse osmosis membrane treatment step of producing a permeated water in the lower water system and a concentrated lower water in the lower water system by membrane separation treatment of sewage;
    A seawater-based reverse osmosis membrane treatment step of producing seawater-based permeated water and seawater-based concentrated water by subjecting the mixed water of the lower water system concentrated water and the taken seawater to a membrane separation treatment,
    A salinity concentration measuring step of measuring the salinity concentration of the seawater-based permeated water;
    A seawater system permeated water circulation process for returning the seawater system permeated water to the sewer system reverse osmosis membrane treatment process according to the salinity concentration of the seawater system permeated water;
    A seawater desalination method comprising:
  9. 　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理工程を有する海水淡水化方法であって、
    　前記下水系濃縮水と取水した海水との混合水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する海水系逆浸透膜処理工程と、
    　前記海水系透過水の塩分濃度を測定する塩分濃度測定工程と、
    　前記海水系透過水の塩分濃度に応じて、前記下水系逆浸透膜処理工程及び前記海水系逆浸透膜処理工程の継続を決定する継続決定工程と、
    　を備えることを特徴とする海水淡水化方法。     A seawater desalination method comprising a sewerage system reverse osmosis membrane treatment step of producing sewerage permeated water and sewerage water concentrate by membrane separation treatment of sewage,
    A seawater-based reverse osmosis membrane treatment step of producing seawater-based permeated water and seawater-based concentrated water by subjecting the mixed water of the lower water system concentrated water and the taken seawater to a membrane separation treatment,
    A salinity concentration measuring step of measuring the salinity concentration of the seawater-based permeated water;
    A continuation determination step of determining continuation of the lower water system reverse osmosis membrane treatment step and the seawater type reverse osmosis membrane treatment step according to the salinity concentration of the seawater system permeate;
    A seawater desalination method comprising:
  10. 　前記海水系透過水を膜分離処理する第２の海水系逆浸透膜処理工程を更に備え、
    　前記塩分濃度測定工程で測定した前記海水系透過水の塩分濃度に応じて前記海水系透過水を前記第２の海水系逆浸透膜処理工程で処理する
    　ことを特徴とする請求項９に記載の海水淡水化方法。     The method further comprises a second seawater system reverse osmosis membrane treatment step of subjecting the seawater system permeated water to membrane separation treatment,
    The seawater system permeated water is treated in the second seawater system reverse osmosis membrane treatment process according to the salinity concentration of the seawater system permeated water measured in the salinity concentration measurement process. Sea water desalination method.
  11. 　前記塩分濃度測定工程で測定した海水系透過水の塩分濃度に応じて、前記海水系透過水を前記下水系逆浸透膜処理工程に戻す海水系透過水循環工程と、を備え、
    　前記下水系逆浸透膜処理工程は、前記海水系透過水循環工程において戻された前記海水系透過水と下水との混合水を膜分離処理する
    　ことを特徴とする請求項９に記載の海水淡水化方法。     The seawater system permeated water circulation process of returning the seawater system permeated water to the lower water system reverse osmosis membrane treatment process according to the salinity concentration of the seawater system permeated water measured in the salt concentration measurement process,
    10. The seawater desalination process according to claim 9, wherein in the lower water system reverse osmosis membrane treatment process, the mixed water of the seawater system permeated water and the sewage returned in the seawater system permeated water circulation process is subjected to a membrane separation process. Method.
  12. 　下水を膜分離処理することで下水系透過水と下水系濃縮水とを生成する下水系逆浸透膜処理工程と、
    　海水を膜分離処理することで海水系透過水と海水系濃縮水とを生成する海水系逆浸透膜処理工程と、
    　前記下水系透過水と前記海水系透過水とが混合された混合透過水を貯留槽に貯留する貯留工程と、
    　当該貯留槽に貯留された混合透過水の水位を計測する水位計測工程と、
    　前記水位計測工程で計測した水位に応じて前記海水系逆浸透膜処理工程を、行うか否かを決定する決定工程と、
    　を備えることを特徴とする海水淡水化方法。     A downstream reverse osmosis membrane treatment step of producing a permeated water in the lower water system and a concentrated lower water in the lower water system by membrane separation treatment of sewage;
    A seawater-based reverse osmosis membrane treatment step of producing seawater-based permeated water and seawater-based concentrated water by subjecting seawater to membrane separation treatment;
    A storage step of storing mixed permeated water in which the permeated water of the lower water system and the permeated seawater are mixed in a storage tank;
    A water level measurement step of measuring the water level of the mixed permeated water stored in the storage tank;
    A determination step of determining whether to perform the seawater system reverse osmosis membrane treatment step according to the water level measured in the water level measurement step;
    A seawater desalination method comprising:
  13. 　前記貯留槽に貯留された混合透過水の塩分濃度を測定する第１の塩分濃度測定工程と、
    　前記下水系逆浸透膜処理工程において生成した下水系透過水の塩分濃度を測定する第２の塩分濃度測定工程と、
    　前記海水系逆浸透膜処理工程において生成した海水系透過水の塩分濃度を測定する第３の塩分濃度測定工程と、
    　を更に備え、
    　前記決定工程は、前記海水系透過水の塩分濃度、前記下水系透過水の塩分濃度及び前記混合透過水の塩分濃度に応じて前記海水系逆浸透膜処理工程を行うか否かを決定する
    　ことを特徴とする請求項１２に記載の海水淡水化方法。     A first salt concentration measuring step of measuring the salt concentration of the mixed permeated water stored in the storage tank;
    A second salt concentration measuring step of measuring the salt concentration of the lower water system permeated water generated in the lower water system reverse osmosis membrane treatment step;
    A third salt concentration measurement step of measuring the salt concentration of seawater-based permeated water generated in the seawater-based reverse osmosis membrane treatment step;
    And further
    In the determining step, it is determined whether to perform the seawater-based reverse osmosis membrane treatment step according to the salinity concentration of the seawater-based permeated water, the salinity concentration of the lower water-system permeated water, and the salinity concentration of the mixed permeated water. The seawater desalination method according to claim 12, characterized in that
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