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WO2013058125A1 - Procédé de désalinisation d'eau de mer et dispositif afférent - Google Patents

Procédé de désalinisation d'eau de mer et dispositif afférent Download PDF

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Publication number
WO2013058125A1
WO2013058125A1 PCT/JP2012/075900 JP2012075900W WO2013058125A1 WO 2013058125 A1 WO2013058125 A1 WO 2013058125A1 JP 2012075900 W JP2012075900 W JP 2012075900W WO 2013058125 A1 WO2013058125 A1 WO 2013058125A1
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Prior art keywords
water
seawater
reverse osmosis
osmosis membrane
mixed
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PCT/JP2012/075900
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English (en)
Japanese (ja)
Inventor
三浦　雅彦
島田　光重
紘史 丸野
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株式会社神鋼環境ソリューション
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Publication of WO2013058125A1 publication Critical patent/WO2013058125A1/fr

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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
    • B01D61/58—Multistep processes
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/04—Specific process operations in the feed stream; Feed pretreatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2311/00—Details relating to membrane separation process operations and control
    • B01D2311/08—Specific process operations in the concentrate stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2315/00—Details relating to the membrane module operation
    • B01D2315/06—Submerged-type; Immersion type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2317/00—Membrane module arrangements within a plant or an apparatus
    • B01D2317/02—Elements in series
    • B01D2317/022—Reject series
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2317/00—Membrane module arrangements within a plant or an apparatus
    • B01D2317/04—Elements in parallel
    • 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
    • B01D61/14—Ultrafiltration; Microfiltration
    • 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
    • C02F1/444—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis by ultrafiltration or microfiltration
    • 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
    • C02F2301/00—General aspects of water treatment
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • 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
    • C02F2303/20—Prevention of biofouling
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C02F3/1273—Submerged membrane bioreactors
    • 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
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the present invention relates to a seawater desalination method and a seawater desalination apparatus, for example, a seawater desalination method and a seawater desalination apparatus that desalinate seawater by filtration using a reverse osmosis membrane device having a reverse osmosis membrane (RO membrane).
  • a seawater desalination method and a seawater desalination apparatus desalinate seawater by filtration using a reverse osmosis membrane device having a reverse osmosis membrane (RO membrane).
  • RO membrane reverse osmosis membrane
  • seawater desalination methods and seawater desalination apparatuses that obtain fresh water as purified water from seawater by filtration using a reverse osmosis membrane device have been proposed (for example, patents). Reference 1).
  • the biologically treated water obtained by biologically treating the wastewater containing organic matter (hereinafter also referred to as “organic wastewater”) in the biological treatment tank is filtered by the first reverse osmosis membrane device to obtain the first concentrated water.
  • the first permeated water as purified water mixed with seawater using the first concentrated water as dilution water to obtain mixed water, and the mixed water is filtered through a second reverse osmosis membrane device to obtain purified water.
  • a seawater desalination method and a seawater desalination apparatus for obtaining permeated water (freshwater) have been proposed (for example, Patent Document 2).
  • the mixed water obtained by mixing the first concentrated water with seawater as dilution water also has a salt concentration from seawater. Is low. Therefore, the energy required to pump the mixed water to the reverse osmosis membrane device to obtain a predetermined amount of fresh water as purified water is smaller than the energy required to pump seawater to the reverse osmosis membrane device. Therefore, according to such a seawater desalination method and seawater desalination apparatus, there is an advantage that energy necessary for pumping per unit amount of purified water to be obtained can be suppressed.
  • the first permeated water obtained from the first reverse osmosis membrane device is purified by filtering the biologically treated water with the first reverse osmosis membrane device.
  • the first permeated water obtained from the first reverse osmosis membrane device is purified by filtering the biologically treated water with the first reverse osmosis membrane device.
  • the biologically treated water contains organisms (bacteria, protozoa, metazoans, etc.), residual organic matter remaining without being decomposed by the organisms, and secretions secreted by the organisms. Therefore, in the seawater desalination method and seawater desalination apparatus of Patent Document 2, the organism, the residual organic matter, and the secretion are also referred to as an RO membrane (hereinafter, “first RO membrane”) of the first reverse osmosis membrane device. ) And deposit. Then, clogging of the first RO membrane (also referred to as “fouling”, in particular, “fouling” derived from organisms is also referred to as “biofouling”) may occur.
  • first RO membrane also referred to as “fouling”
  • biofouling clogging of the first RO membrane
  • the biologically treated water is usually temporarily stored in the biologically treated water storage tank while being transferred from the biological treatment tank to the first reverse osmosis membrane device. Then, when the biologically treated water is stored in the biologically treated water storage tank, microorganisms are mixed into the biologically treated water through air or the like. As a result, biofouling may also occur due to this microorganism. In some cases, the organism attached to the RO membrane secretes and proliferates secretions to form biofouling. Biofouling may progress as a result of organisms attached to the first RO membrane secreting secretions and continuing to grow. Biofouling is a factor that increases the resistance of water (flow path resistance) when passing through the membrane surface of the first RO membrane.
  • an object of the present invention is to provide a seawater desalination method and a seawater desalination apparatus that can suppress biofouling while obtaining purified water using biologically treated water and seawater.
  • biologically treated water obtained by biologically treating organic wastewater is filtered with a first reverse osmosis membrane device to obtain a first concentrated water, and the first concentrated water and seawater are mixed to perform a first mixing.
  • the present invention also provides a first reverse osmosis membrane device that obtains concentrated water by subjecting biological treated water obtained by biological treatment of organic wastewater, and mixed water by mixing the concentrated water with seawater as dilution water. And a second reverse osmosis membrane device for filtering the mixed water, and biologically treated water is filtered by the first reverse osmosis membrane device to obtain a first concentrated water, 1 Concentrated water and seawater are mixed to obtain a first mixed water, and the first reverse water is filtered by the second reverse osmosis membrane device, and the biologically treated water is filtered by the second reverse osmosis membrane device.
  • the seawater desalination apparatus is characterized in that it can be implemented alternately.
  • FIG. 1 is a schematic diagram of a seawater desalination apparatus according to the present embodiment.
  • a seawater desalination apparatus 10 according to this embodiment includes a biological treatment tank 11 that biologically treats organic wastewater B to obtain biologically treated water, a microfiltration membrane (MF membrane), and an ultrafiltration membrane.
  • MF membrane microfiltration membrane
  • a first turbidizer 12 having at least one of (UF membrane) and turbidizing biologically treated water by filtration to obtain a first turbidized treated water, and a first pressure for pressurizing the first turbidized treated water
  • a pressure unit 13 a first reverse osmosis membrane device 14 for obtaining a first permeated water and a first concentrated water as purified water C by filtering the pressurized first turbidity-treated water as biologically treated water, and microfiltration
  • a second turbidity device 15 having at least one of a membrane (MF membrane) and an ultrafiltration membrane (UF membrane) and turbidizing seawater A by filtration to obtain second turbidized treated water; The second turbidity-treated water and the first concentrated water are mixed to obtain a first mixed water, and a first pressure is applied to the first mixed water. It includes a pressurizing section 17, and a second reverse osmosis unit 18 for filtering processing of the first mixed water pressurized.
  • the seawater A is water containing salt, for example, water having a salt concentration of 1.0% by mass or more and 8.0% by mass or less. More specifically, the salt concentration is, for example, 2.5% by mass or more. It is 6.0 mass% or less.
  • the seawater A is not limited to the water which exists in the sea, If it is water whose salt concentration is 1.0 mass% or more, the water of a lake (salt lake, brackish lake), swamp water, pond water, etc. Including water existing on the land.
  • the organic waste water B is waste water containing organic matter, for example, waste water having a BOD (biochemical oxygen demand) as an indicator of organic matter concentration of 2000 mg / L or less, more specifically 100 to 2000 mg. / L wastewater.
  • the organic waste water B is water having a lower salt concentration than seawater.
  • the organic wastewater B has, for example, a ratio of the salt concentration of the organic wastewater B to the salt concentration of the seawater A of 0.1 or less, more specifically, the salt concentration of the organic wastewater B with respect to the salt concentration of the seawater A. The ratio is 0.01 or less.
  • Examples of the organic waste water B include sewage (domestic waste water, rain water flowing into the sewer, etc.), industrial waste water (waste water discharged from factories such as food factories, chemical factories, electronics industry factories, and pulp factories). It is done.
  • the biological treatment is a treatment for decomposing organic substances contained in water by biological species such as bacteria, protozoa and metazoans.
  • biological species such as bacteria, protozoa and metazoans.
  • Examples of the biological treatment include aeration treatment using activated sludge.
  • turbidity means removing coarse impurities (for example, a solid substance etc.) rather than separating with a reverse osmosis membrane device before filtering with a reverse osmosis membrane device. It means that the filtration is coarser than the membrane filtration or the sedimentation is performed.
  • the first turbidity removal device 12 includes a filtration membrane having at least one of an MF membrane and a UF membrane.
  • the filtration membrane is installed as an immersion membrane under the liquid surface of the biological treatment tank 11.
  • Examples of the pressure units 13 and 17 include a pump.
  • the reverse osmosis membrane devices 14 and 18 include an RO membrane and a pressure vessel that accommodates the RO membrane.
  • the RO membrane in this specification is a concept including a nanofiltration membrane (NF membrane).
  • the second turbidizer 15 includes a filtration membrane having at least one of an MF membrane and a UF membrane, and a pressure vessel that accommodates the filtration membrane.
  • the seawater desalination apparatus 10 biologically treats the organic wastewater B in the biological treatment tank 11 to obtain biologically treated water.
  • To obtain the first turbidized treated water pressurize the first turbidized treated water with the first pressurizing unit 13, and filter the pressurized first turbidized treated water with the first reverse osmosis membrane device 14.
  • the first permeated water and the first concentrated water as the purified water C are obtained by treatment, and the seawater A is turbidized by the second turbidity removing device 15 to obtain the second turbidized treated water.
  • Concentrated water is mixed by the mixing unit 16 to obtain first mixed water, the first mixed water is pressurized by the second pressurizing unit 17, and the pressurized first mixed water is filtered by the second reverse osmosis membrane device 18. It is comprised so that the 1st process of processing and obtaining the 3rd permeated water and the 3rd concentrated water D which are fresh water can be implemented.
  • the organic waste water B is transferred to the biological treatment tank 11 and the first turbidity-treated water is transferred to the first reverse osmosis membrane apparatus 14 when the first step is performed.
  • the first permeated water is transferred to the purified water storage tank (not shown) as the purified water C, the first concentrated water is transferred to the mixing unit 16, the seawater A is transferred to the second turbidizer 15, 2 The turbidity-treated water is transferred to the mixing unit 16, the first mixed water is transferred to the second reverse osmosis membrane device 18, and the third permeated water as fresh water is used as purified water E in a purified water storage tank (not shown).
  • the third concentrated water D is transferred and is transferred to a concentrated water storage tank (not shown).
  • the seawater desalination apparatus 10 includes a plurality of paths.
  • a first transfer path 20a for transferring the first turbidity-treated water to the first reverse osmosis membrane apparatus 14, and a first concentration.
  • a second transfer path 20b for transferring water to the mixing unit 16, a third transfer path 20c for transferring the first mixed water to the second reverse osmosis membrane device 18, and a third concentrated water D for the concentrated water storage tank (not shown).
  • a fourth transfer path 20d for transferring to the second transfer path 20d.
  • the seawater desalination apparatus 10 biologically treats the organic wastewater B in the biological treatment tank 11 to obtain biologically treated water.
  • To obtain the first turbidity-treated water pressurize the first turbidity-treated water with the first pressurizing unit 13, and filter the pressurized first turbidity-treated water with the second reverse osmosis membrane device 18.
  • the second permeated water and the second concentrated water are obtained by treatment, and the seawater A is turbidized by the second turbidizer 15 to obtain the second turbidized treated water, and the second turbidized treated water and the second concentrated water are obtained.
  • the second mixed water is obtained by mixing in the mixing unit 16, the second mixed water is pressurized by the second pressurizing unit 17, and the pressurized second mixed water is filtered by the first reverse osmosis membrane device 14.
  • the second step of obtaining the fourth permeated water and the fourth concentrated water F can be performed.
  • the organic waste water B is transferred to the biological treatment tank 11 and the first turbidity-treated water is transferred to the second reverse osmosis membrane apparatus 18 when the second step is performed.
  • the second permeated water is transferred to the purified water storage tank (not shown) as the purified water E, the second concentrated water is transferred to the mixing unit 16, the seawater A is transferred to the second turbidizer 15, 2
  • the turbidity-treated water is transferred to the mixing unit 16, the second mixed water is transferred to the first reverse osmosis membrane device 14, and the fourth permeated water, which is fresh water, is used as purified water C in a purified water storage tank (not shown).
  • the fourth concentrated water F is transferred and is transferred to a concentrated water storage tank (not shown).
  • the seawater desalination apparatus 10 of the present embodiment has, in addition to the above-described path, for example, a fifth transfer path 20e that transfers the first turbidity-treated water to the second reverse osmosis membrane apparatus 18, and a second concentrated water.
  • an eighth transfer path 20h for example, a fifth transfer path 20e that transfers the first turbidity-treated water to the second reverse osmosis membrane apparatus 18, and a second concentrated water.
  • the seawater desalination apparatus 10 of this embodiment includes a valve interposed in each transfer path.
  • the seawater desalination apparatus 10 of the present embodiment uses the first transfer path 20a, the second transfer path 20b, the third transfer path 20c, the fourth transfer path 20d, and the second valve as the valves.
  • 19d, a fifth valve 19e, a sixth valve 19f, a seventh valve 19g, and an eighth valve 19h are examples of the seawater desalination apparatus 10 of this embodiment.
  • the seawater desalination apparatus 10 of this embodiment is provided with the valve mechanism which determines a flow path by opening / closing operation of each valve.
  • the first step is performed by the valve mechanism in which the first to fourth valves are opened and the fifth to eighth valves are closed. It is configured to be implemented.
  • the second step is performed by closing the first to fourth valves and opening the fifth to eighth valves by the valve mechanism. It is configured to be implemented.
  • the salt concentration of the mixed water obtained in the mixing unit 16 preferably exceeds 0.2M (0.2 mol / L) when non-halophilic organisms are contained in the biologically treated water.
  • the salt concentration is more preferably more than 0.5M.
  • the salt concentration that sufficiently suppresses the growth of non-halophilic organisms is 0.2M, and the salt concentration that sufficiently suppresses the growth of non-halophilic organisms and low-halogenated organisms is 0.5M. is there.
  • the salt concentration of the mixed water is preferably 0.8M or less, and more preferably 0.6M or less.
  • feedwater the volume ratio of seawater in water supplied to one reverse osmosis membrane device
  • the salt concentration of the feedwater (feedwater) Salt concentration) the amount of energy required in order to desalinate seawater per quantity of the freshwater which is the purified water obtained can be suppressed.
  • the seawater mixing ratio is small.
  • Highly halophilic organisms are those with optimal growth NaCl concentrations above 2.5M.
  • the moderately halophilic organisms include bacteria that have an optimal growth NaCl concentration of more than 0.5M and not more than 2.5M, and are separated from various salt-containing samples.
  • the low-degree halophilic organism has an optimal growth NaCl concentration of more than 0.2M and 0.5M or less, and examples include marine higher organisms and bacteria.
  • Non-halophilic organisms have an optimal growth NaCl concentration of more than 0 M and not more than 0.2 M, and many higher organisms and soil bacteria are applicable.
  • the salt concentration of the supply water is 0.12M.
  • the salt concentration of the supply water is 0.24M.
  • the salt concentration of the supply water is 0.36M.
  • the salt concentration of the supply water is 0.50M.
  • the seawater mixing ratio is 100%, that is, when the supply water is only seawater (seawater 100%), the salt concentration of the supply water is 0.60M.
  • the growth of the organism is sufficiently suppressed outside the range of the optimal growth NaCl concentration, and particularly when the concentration is higher than the optimal growth NaCl concentration, the growth is effectively suppressed and the organism may be killed. For this reason, as shown in FIG. 4, when the seawater mixing ratio of the feed water is 30% or less, the salt concentration of the feed water is 0.2 M or less, so that non-halophilic organisms can grow. . In addition, when the seawater mixing ratio of the feed water is more than 30% and 80% or less, the salt concentration of the feed water is more than 0.2M and less than 0.5M, so that low-halophilic organisms can grow. is there.
  • the ratio of the seawater is increased so that the salt concentration of the feed water exceeds 0.5M, the growth of non-halophilic organisms and low-degree halophilic organisms is sufficiently suppressed.
  • the biologically treated water contains a relatively large amount of non-halophilic organisms and low-degree halophilic organisms. Therefore, after the biologically treated water is filtered by one reverse osmosis membrane device, the salt concentration is 0 after the non-halophilic organism and the low halophilic organism adhere to the RO membrane of the one reverse osmosis membrane device.
  • the seawater desalination method of the present embodiment is a method of alternately performing the first step and the second step using the seawater desalination apparatus of the present embodiment.
  • seawater desalination apparatus and the seawater desalination method of the present embodiment are configured as described above, they have the following advantages.
  • the biologically treated water obtained by biologically treating the organic wastewater B is filtered by the first reverse osmosis membrane device 14 to obtain the first concentrated water, and the first concentrated water is obtained.
  • a second concentrated water is obtained by filtration, the second concentrated water and seawater A are mixed to obtain a second mixed water, and the second reverse osmosis membrane device 14 filters the second mixed water. The process is performed alternately.
  • first RO membrane reverse osmosis membrane
  • the second RO membrane not only the first RO membrane but also the reverse osmosis membrane (hereinafter also referred to as “second RO membrane”) of the second reverse osmosis membrane device 18 is the same.
  • second RO membrane the reverse osmosis membrane of the second reverse osmosis membrane device 18
  • seawater A is included by performing the first step after the second step. Since the first mixed water is filtered by the second reverse osmosis membrane device 18, organisms attached to the second RO membrane are difficult to grow due to salt or the like in the first mixed water, and biofouling of the second RO membrane There is an advantage that can be suppressed.
  • permeated water as purified water can be obtained by filtering the mixed water containing seawater and the biologically treated water with a reverse osmosis membrane device. That is, according to the seawater desalination method, biofouling can be suppressed while obtaining purified water using biologically treated water and seawater.
  • the seawater desalination apparatus 10 of the present embodiment includes a first reverse osmosis membrane device 14 that obtains concentrated water by filtering biologically treated water obtained by biologically treating organic wastewater, and diluting the concentrated water.
  • the mixing part 16 which mixes with seawater and obtains mixed water
  • the 2nd reverse osmosis membrane apparatus 18 which filters this mixed water are provided.
  • the seawater desalination apparatus 10 of this embodiment obtains the 1st concentrated water by filtering biological treatment water with the said 1st reverse osmosis membrane apparatus 14, mixes this 1st concentrated water and seawater, and is 1st.
  • the second concentrated water and the seawater A are mixed to obtain the second mixed water, and the second step of filtering the second mixed water with the first reverse osmosis membrane device 14 can be performed alternately. It is configured. According to the seawater desalination apparatus 10, biofouling can be suppressed while obtaining purified water using biologically treated water and seawater.
  • seawater desalination method and seawater desalination apparatus according to the present embodiment have the above-described configuration, but the seawater desalination method and seawater desalination apparatus according to the present invention are not limited to the above-described configuration, and may be appropriately changed in design. Is possible.
  • the filtration membrane of the first turbidity removal apparatus 12 is installed as a submerged membrane below the liquid surface of the biological treatment tank 11, but the seawater desalination apparatus of the present invention. Then, the filter membrane of the first turbidity removal device 12 may be of a type installed outside the tank as shown in FIG. In such an embodiment, the first turbidity removal device 12 may include a storage container that stores the filtration membrane.
  • the said 1st turbidity removal apparatus 12 is the said filtration.
  • the membrane instead of the membrane, at least one of a sand filtration unit having a sand filter and a precipitation separation tank for separating and separating the water to be treated may be provided.
  • the first turbidity removal device 12 may include the filtration membrane, and may further include at least one of the sand filtration unit and the precipitation separation tank.
  • the first turbidity removal device 12 further includes a precipitation separation tank and biological treatment water in the precipitation separation tank, when the sand filtration unit is provided. It is preferable that a supernatant is obtained by precipitation separation in step (b), and the supernatant is filtered through the sand filtration unit.
  • the second turbidity removal device 15 includes the filtration membrane.
  • the second turbidity reduction device 15 includes the filtration.
  • at least one of a sand filtration unit having a sand filter and a precipitation separation tank for separating and separating the water to be treated may be provided.
  • the second turbidity removal device 15 may include the filtration membrane, and may further include at least one of the sand filtration unit and the precipitation separation tank.
  • the second turbidizer 15 further includes a sedimentation separation tank when the sand filtration unit is provided, and the seawater is precipitated in the precipitation separation tank. It is preferable that the supernatant is obtained by separation, and the supernatant is filtered through the sand filtration unit.
  • SYMBOLS 10 Seawater desalination apparatus
  • 11 Biological treatment tank
  • 12 1st turbidity removal apparatus
  • 13 1st pressurization part
  • 14 1st reverse osmosis membrane apparatus
  • 15 2nd turbidity reduction apparatus
  • 16 Mixing part 17: 2nd pressurization part
  • 18 2nd reverse osmosis membrane apparatus
  • A Seawater
  • B Organic waste water
  • C Purified water
  • D Concentrated water
  • E Purified water
  • F Concentrated water

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  • Engineering & Computer Science (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Activated Sludge Processes (AREA)

Abstract

Le procédé de désalinisation d'eau de mer ci-décrit est caractérisé par la mise en œuvre en alternance d'une première étape et d'une seconde étape. Dans la première étape, une première eau concentrée est obtenue par filtration d'une eau biologiquement traitée au moyen d'un premier dispositif à membrane d'osmose inverse ; une première eau mixte est obtenue par mélange de la première eau concentrée avec de l'eau de mer ; et la première eau mixte est filtrée au moyen d'un second dispositif à membrane d'osmose inverse. Dans la seconde étape, une seconde eau concentrée est obtenue par filtration d'une eau biologiquement traitée au moyen du second dispositif à membrane d'osmose inverse ; une seconde eau mixte est obtenue par mélange de la seconde eau concentrée avec de l'eau de mer ; et la seconde eau mixte est filtrée au moyen du premier dispositif à membrane d'osmose inverse.
PCT/JP2012/075900 2011-10-18 2012-10-05 Procédé de désalinisation d'eau de mer et dispositif afférent WO2013058125A1 (fr)

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SG11201507830XA (en) * 2013-03-22 2015-10-29 Toray Industries Fresh water production process
CN109516594A (zh) * 2018-12-03 2019-03-26 安徽华塑股份有限公司 反渗透浓水回收利用系统
JP7120095B2 (ja) * 2019-03-18 2022-08-17 栗田工業株式会社 水処理システム

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JP2010240635A (ja) * 2009-03-15 2010-10-28 Chikyu Kankyo Hidemitsu:Kk 複合発酵法による排水と海水の混合水の淡水化方法
JP2011041907A (ja) * 2009-08-21 2011-03-03 Toray Ind Inc 水処理システム
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JP4499835B1 (ja) * 2009-02-14 2010-07-07 株式会社神鋼環境ソリューション 淡水生成装置および淡水生成方法

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JP2010240635A (ja) * 2009-03-15 2010-10-28 Chikyu Kankyo Hidemitsu:Kk 複合発酵法による排水と海水の混合水の淡水化方法
JP2011041907A (ja) * 2009-08-21 2011-03-03 Toray Ind Inc 水処理システム
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JP4973822B1 (ja) * 2012-02-22 2012-07-11 株式会社日立プラントテクノロジー 海水淡水化システム

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