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WO2024166591A1 - Procédé et dispositif de traitement des eaux - Google Patents

Procédé et dispositif de traitement des eaux Download PDF

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Publication number
WO2024166591A1
WO2024166591A1 PCT/JP2024/000378 JP2024000378W WO2024166591A1 WO 2024166591 A1 WO2024166591 A1 WO 2024166591A1 JP 2024000378 W JP2024000378 W JP 2024000378W WO 2024166591 A1 WO2024166591 A1 WO 2024166591A1
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Prior art keywords
water
treated
aluminum
reverse osmosis
osmosis membrane
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PCT/JP2024/000378
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English (en)
Japanese (ja)
Inventor
雄大 鈴木
美弥 福田
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Organo Corp
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Organo Corp
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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
    • B01D61/04—Feed pretreatment
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F5/00—Softening water; Preventing scale; Adding scale preventatives or scale removers to water, e.g. adding sequestering agents
    • C02F5/08—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents
    • C02F5/10—Treatment of water with complexing chemicals or other solubilising agents for softening, scale prevention or scale removal, e.g. adding sequestering agents using organic substances

Definitions

  • the present invention relates to a water treatment method and water treatment device that uses a reverse osmosis membrane.
  • Patent Document 1 describes that even when silica is at a concentration below its solubility, iron and aluminum promote scaling, and that even in this case, scaling can be prevented by keeping the aluminum ion concentration at 0.4 mg/L or less, the iron ion concentration at 0.8 mg/L or less, and by appropriately controlling the Langelier index.
  • the water supplied to the reverse osmosis membrane (the water to be treated) to contain turbid components, and so coagulation and turbidity removal processes are generally carried out as pretreatment for reverse osmosis membrane treatment.
  • coagulation and turbidity removal processes are generally carried out as pretreatment for reverse osmosis membrane treatment.
  • aluminum-based coagulants are often used.
  • the optimal amount of coagulant to be added varies depending on the raw water quality, water temperature, weather, etc., and if an excessive amount of coagulant is added, aluminum may remain in the treated water in the pretreatment process.
  • the object of the present invention is to provide a water treatment method and a water treatment device that can suppress the deposition of scale in water treatment using a reverse osmosis membrane to treat water that contains silica and aluminum.
  • the present invention is a water treatment method that includes a reverse osmosis membrane treatment step in which water to be treated that contains silica and aluminum is passed through a reverse osmosis membrane to obtain permeate and concentrated water, in which the silica concentration in the concentrated water is equal to or lower than the solubility and the aluminum concentration exceeds 0.1 mg/L, and a scale dispersant containing a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid is added to the water to be treated.
  • the calcium ion concentration in the concentrated water is 80 mg/L or more and the Langelier index is 0 or less.
  • the concentration of the scale dispersant added based on the aluminum ion concentration in the water to be treated.
  • the water treatment method it is preferable to measure the aluminum ion concentration in the water to be treated and at least two of the three flow rates of the water to be treated, the permeate, and the concentrate in the reverse osmosis membrane treatment, and to control the concentration of the scale dispersant to be added based on the measured values.
  • the water treatment method preferably further includes a coagulation treatment step prior to the reverse osmosis membrane treatment step, and uses an aluminum-containing coagulant as the coagulant in the coagulation treatment step.
  • the present invention is a water treatment device that includes a reverse osmosis membrane treatment means for performing reverse osmosis membrane treatment in which water to be treated that contains silica and aluminum is passed through a reverse osmosis membrane to obtain permeate water and concentrated water, and an addition means for adding a scale dispersant that contains a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid to the water to be treated, and in which the concentration of silica in the concentrated water is equal to or lower than the solubility, and the concentration of aluminum exceeds 0.1 mg/L.
  • the calcium ion concentration in the concentrated water is 80 mg/L or more and the Langelier index is 0 or less.
  • the water treatment device preferably further comprises an aluminum ion concentration measuring means for measuring the aluminum ion concentration in the water to be treated, and a control means for controlling the concentration of the scale dispersant added based on the aluminum ion concentration in the water to be treated measured by the aluminum ion concentration measuring means.
  • the water treatment device preferably further comprises at least two of the following three: a treated water flow rate measuring means for measuring the flow rate of the treated water in the reverse osmosis membrane treatment, a permeated water flow rate measuring means for measuring the flow rate of the permeated water, and a concentrated water flow rate measuring means for measuring the flow rate of the concentrated water; and the control means preferably controls the concentration of the scale dispersant to be added based on the numerical values of the aluminum ion concentration in the treated water measured by the aluminum ion concentration measuring means, and any two of the following three: the flow rate of the treated water measured by the treated water flow rate measuring means, the flow rate of the permeated water measured by the permeated water flow rate measuring means, and the flow rate of the concentrated water measured by the concentrated water flow rate measuring means.
  • the water treatment device it is preferable to further include a flocculation treatment means upstream of the reverse osmosis membrane treatment means, and to use an aluminum-containing flocculating agent as the flocculating agent for the flocculation treatment means.
  • the present invention provides a water treatment method and a water treatment device that can suppress the deposition of scale in water treatment using a reverse osmosis membrane to treat water that contains silica and aluminum.
  • FIG. 1 is a schematic diagram illustrating an example of a water treatment device according to an embodiment of the present invention.
  • FIG. 4 is a schematic configuration diagram showing another example of a water treatment device according to an embodiment of the present invention.
  • FIG. 4 is a schematic configuration diagram showing another example of a water treatment device according to an embodiment of the present invention.
  • FIG. 1 is a schematic diagram showing the flow used in the examples. 1 is a graph showing the corrected flux retention rate (vs. initial value) versus operation time (h) in Example 1. 1 is a graph showing the corrected flux retention (vs. initial value) versus operation time (h) in Example 2.
  • the water treatment method includes a reverse osmosis membrane treatment step in which water to be treated that contains silica and aluminum is passed through a reverse osmosis membrane to obtain permeate and concentrated water, in which the silica concentration in the concentrated water is equal to or lower than the solubility and the aluminum concentration exceeds 0.1 mg/L, and a scale dispersant containing a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid is added to the water to be treated.
  • FIG. 1 An example of a water treatment device according to an embodiment of the present invention is outlined in FIG. 1, and its configuration will be described.
  • the water treatment device 1 includes a reverse osmosis membrane treatment device 12 as a reverse osmosis membrane treatment means that performs reverse osmosis membrane treatment to obtain permeate and concentrated water by passing water to be treated that contains silica and aluminum through a reverse osmosis membrane.
  • the water treatment device 1 may also include a water tank 10 to store water to be treated that contains silica and aluminum.
  • a treated water pipe 14 is connected to the treated water inlet of the treated water tank 10.
  • the treated water outlet of the treated water tank 10 and the treated water inlet of the reverse osmosis membrane treatment device 12 are connected by a treated water pipe 16.
  • a permeated water pipe 18 is connected to the permeated water outlet of the reverse osmosis membrane treatment device 12, and a concentrated water pipe 20 is connected to the concentrated water outlet.
  • a scale dispersant addition pipe 22 is connected to the chemical inlet of the treated water tank 10.
  • the water to be treated that contains silica and aluminum is stored in the water to be treated tank 10 as needed through the water to be treated piping 14.
  • a scale dispersant containing a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid is added to the water to be treated in the water to be treated tank 10 (scale dispersant addition process).
  • the water to be treated to which the scale dispersant has been added is sent to the reverse osmosis membrane treatment device 12 through the water to be treated piping 16.
  • the scale dispersant may be added via a line in the water to be treated piping 14 or the water to be treated piping 16.
  • the water to be treated is passed through a reverse osmosis membrane to perform reverse osmosis membrane treatment to obtain permeated water and concentrated water (reverse osmosis membrane treatment process).
  • the permeated water is discharged through the permeated water pipe 18, and the concentrated water is discharged through the concentrated water pipe 20.
  • the inventors' research has revealed that, as described above, even when the concentrated water from reverse osmosis treatment has a Langelier index of less than 0, is almost free of iron ions, has an aluminum ion concentration of 0.4 mg/L or less, and has a silica concentration below its solubility, silica combines with aluminum to precipitate as aluminum silicate, resulting in the precipitation of scale.
  • the inventors' research has revealed that, as mentioned above, when performing coagulation treatment using an aluminum-based coagulant as a pretreatment for reverse osmosis membrane treatment, the optimal amount of coagulant to be added varies depending on the raw water quality, water temperature, weather, etc., and therefore if an excess of aluminum-based coagulant is added with a margin of error, the aluminum derived from the coagulant will flow into the reverse osmosis membrane treatment and become one of the causes of scaling.
  • composite scale which is formed by silica below its solubility and coexisting aluminum
  • a scale dispersant that contains acrylic acid as a constituent monomer.
  • Acrylic acid has the effect of chelating cations, and is generally used as a scale dispersant for hardness. It is believed that this chelating effect is also exerted on aluminum, thereby inhibiting the deposition of composite scale.
  • the scale dispersant used contains a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid (AMPS).
  • AMPS 2-acrylamido-2-methylpropanesulfonic acid
  • the weight average molecular weight of this copolymer is not particularly limited, but is, for example, in the range of 2000 to 11000, and preferably in the range of 4000 to 5000. If the weight average molecular weight of the copolymer is less than 2000, the steric hindrance effect in scale dispersion may be insufficient, and if it exceeds 11000, the reverse osmosis membrane may be clogged.
  • the molar ratio of acrylic acid to 2-acrylamido-2-methylpropanesulfonic acid in this copolymer is not particularly limited, but is, for example, in the range of 80:20 to 70:30, and preferably in the range of 78:22 to 72:28. If the molar ratio of acrylic acid to 2-acrylamido-2-methylpropanesulfonic acid in the copolymer is less than 70:30, the ability to chelate cations may be insufficient, and if the amount of 2-acrylamido-2-methylpropanesulfonic acid is less than 80:20, the dispersing force due to charge repulsion of the scale dispersant polymer itself may be insufficient.
  • the concentration of silica in the concentrated water is below its solubility.
  • the solubility of silica in water at 25°C is 120 mg/L.
  • the aluminum concentration in the concentrated water is preferably greater than 0.1 mg/L and is preferably 0.17 mg/L or greater. If the aluminum concentration in the concentrated water is 0.1 mg/L or less, there may be a large error in the accuracy of the aluminum measurement. There is no particular upper limit for the aluminum concentration in the concentrated water, but it is, for example, 10 mg/L.
  • the calcium ion concentration in the concentrated water is 80 mg/L or more, and preferably 120 mg/L or more. If the calcium ion concentration in the concentrated water is less than 80 mg/L, it may not affect the solubility of silica. There is no particular limit to the upper limit of the calcium ion concentration in the concentrated water, but it is, for example, 1000 mg/L.
  • this chelating effect also acts on calcium when it is present in the treated water. It is believed that calcium promotes the formation of silica scale when it coexists with silica, and that by chelating the calcium, this promoting effect on scaling can be suppressed.
  • the Langelier index of the concentrated water is 0 or less, and preferably -0.1 or less. If the Langelier index of the concentrated water exceeds 0, calcium carbonate may precipitate. There is no particular limit to the lower limit of the Langelier index of the concentrated water, but it is, for example, -3.0.
  • the pH of the water to be treated is, for example, in the range of 4.0 to 10.0, and preferably in the range of 5.5 to 9.0. If the pH of the water to be treated is less than 4.0, the rejection rate of the reverse osmosis membrane may drop sharply and the quality of the permeated water may deteriorate, and if it exceeds 10.0, the reverse osmosis membrane may deteriorate due to hydrolysis.
  • the concentration of scale dispersant added may be determined and controlled based on the aluminum ion concentration in the water being treated.
  • the aluminum ion concentration in the water to be treated and any two of the three flow rates of the water to be treated, the permeate water, and the concentrated water in the reverse osmosis membrane treatment may be continuously measured, for example, and the concentration of the scale dispersant to be added may be determined and controlled based on the values.
  • the water treatment device 3 shown in FIG. 2 includes an aluminum ion concentration measuring device 30 as an aluminum ion concentration measuring means for measuring the aluminum ion concentration in the water to be treated, and a control device 32 as a control means for controlling the concentration of scale dispersant added based on the aluminum ion concentration in the water to be treated measured by the aluminum ion concentration measuring device 30.
  • the water treatment device 3 may further include at least two of the following three: a flowmeter 24 as a treated water flow rate measuring means for measuring the flow rate of the water to be treated in the reverse osmosis membrane treatment, a flowmeter 26 as a permeated water flow rate measuring means for measuring the flow rate of the permeated water, and a flowmeter 28 as a concentrated water flow rate measuring means for measuring the flow rate of the concentrated water.
  • a flowmeter 24 as a treated water flow rate measuring means for measuring the flow rate of the water to be treated in the reverse osmosis membrane treatment
  • a flowmeter 26 as a permeated water flow rate measuring means for measuring the flow rate of the permeated water
  • a flowmeter 28 as a concentrated water flow rate measuring means for measuring the flow rate of the concentrated water.
  • an aluminum ion concentration measuring device 30 is installed in the treated water tank 10.
  • a flow meter 24 is installed in the treated water pipe 16
  • a flow meter 26 is installed in the permeate water pipe 18, and a flow meter 28 is installed in the concentrated water pipe 20. It is sufficient that at least two of the flow meters 24, 26, and 28 are installed.
  • the aluminum ion concentration measuring device 30 may be an Aztec AW631 (manufactured by ABB), an aluminum analyzer Liqiline System CA80AL (manufactured by Endress Hauser), or the like.
  • An inductively coupled plasma mass spectrometry (ICP-MS) device may also be used as the aluminum ion concentration measuring device 30.
  • An example of the ICP-MS device that may be used is the 7850 ICP-MS (manufactured by Agilent).
  • the control device 32 is connected to the aluminum ion concentration measuring device 30 and adjustment means such as pumps and valves for adjusting the amount and addition time of the scale dispersant installed in the scale dispersant addition piping 22 so as to be able to communicate by wire or wirelessly. This makes it possible to determine and control the concentration of the scale dispersant to be added based on the aluminum ion concentration in the water to be treated.
  • the control device 32 is composed of a microcomputer and electronic circuits, which are made up of, for example, a calculation means such as a CPU that calculates a program, and storage means such as ROM and RAM that store the programs and calculation results, and has the function of controlling the flow rate of the pump, the opening and closing degree of the valves, etc.
  • a calculation means such as a CPU that calculates a program
  • storage means such as ROM and RAM that store the programs and calculation results
  • the concentration of aluminum ions flowing into the reverse osmosis membrane is prone to fluctuation, but the inventors have discovered that the reverse osmosis membrane can be operated stably by continuously monitoring the aluminum ion concentration, for example, online, and determining and controlling the amount of scale dispersant to be added based on that concentration.
  • the aluminum ion concentration is measured continuously, for example, online, by an aluminum ion concentration measuring device 30 in the water supply (water to be treated) to the reverse osmosis membrane, and a theoretical aluminum ion concentration can be calculated from a concentration factor obtained from the ratio of any two of the flow rate of the water to be treated measured by flowmeter 24, the flow rate of the permeated water measured by flowmeter 26, and the flow rate of the concentrated water measured by flowmeter 28, and this can be used. This is because when the aluminum ion concentration in the concentrated water is measured directly, it is considered that aluminum has already been consumed in the formation of composite scale with silica, and the value may no longer be valid.
  • the water to be treated that contains silica and aluminum is not particularly limited as long as it is water that contains silica and aluminum, but examples include coagulation treated water, membrane filtration treated water, industrial water, etc.
  • the water treatment method and water treatment device according to this embodiment are particularly suitable for use in treating coagulation treated water.
  • the water treatment method according to this embodiment may include a coagulation treatment process prior to the reverse osmosis membrane treatment process.
  • An aluminum-containing coagulant may be used as the coagulant in the coagulation treatment process.
  • FIG. 3 An example of a water treatment device having such a configuration is shown in Figure 3.
  • a coagulation treatment device 34 coagulation treatment process
  • reverse osmosis membrane treatment device 12 reverse osmosis membrane treatment process
  • coagulation treatment is performed on industrial wastewater, lake water, river water, etc. using a coagulant containing, for example, aluminum.
  • the coagulated water obtained in the coagulation treatment device 34 is stored in the treated water tank 10 as required through the treated water piping 14 in the same manner as in the water treatment devices 1 and 3 as the treated water containing silica and aluminum, and then reverse osmosis treatment is performed in the reverse osmosis membrane treatment device 12, where the water is passed through a reverse osmosis membrane to obtain permeated water and concentrated water (reverse osmosis membrane treatment process).
  • a scale dispersant containing a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid is added to the treated water in the treated water tank 10, etc. (scale dispersant addition process).
  • the flocculation treatment device 34 may be any device that performs flocculation treatment, and is not particularly limited. Examples include flocculation sedimentation treatment devices, flocculation pressure flotation treatment devices, and flocculation membrane filtration treatment devices.
  • a reverse osmosis membrane treatment step includes a reverse osmosis membrane treatment in which water to be treated containing silica and aluminum is passed through a reverse osmosis membrane to obtain a permeate and a concentrated water
  • the water treatment method includes adding to the treated water a scale dispersant containing a copolymer of acrylic acid and 2-acrylamido-2-methylpropanesulfonic acid, the concentration of silica in the concentrated water being equal to or lower than the solubility thereof and the concentration of aluminum being greater than 0.1 mg/L.
  • a water treatment method comprising measuring an aluminum ion concentration in the treated water and at least two of the three flow rates of the treated water, the permeate water, and the concentrated water in the reverse osmosis membrane treatment, and controlling the concentration of the scale dispersant to be added based on the measured values.
  • the water treatment method further comprises a flocculation treatment step prior to the reverse osmosis membrane treatment step, and uses an aluminum-containing flocculant as the flocculant in the flocculation treatment step.
  • a reverse osmosis membrane treatment means for performing reverse osmosis membrane treatment in which water to be treated containing silica and aluminum is passed through a reverse osmosis membrane to obtain a permeate and a concentrated water;
  • An adding means for adding a scale dispersant containing a copolymer of acrylic acid and 2-acrylamide-2-methylpropanesulfonic acid to the water to be treated; Equipped with The water treatment device, wherein the concentration of silica in the concentrated water is equal to or lower than its solubility, and the concentration of aluminum in the concentrated water is greater than 0.1 mg/L.
  • the water treatment device according to (6), The concentrated water has a calcium ion concentration of 80 mg/L or more and a Langelier index of 0 or less.
  • the water treatment device according to (6) or (7), an aluminum ion concentration measuring means for measuring the aluminum ion concentration in the water to be treated; A control means for controlling the concentration of the scale dispersant added based on the aluminum ion concentration in the water to be treated measured by the aluminum ion concentration measuring means;
  • the water treatment device further comprises:
  • the apparatus further includes at least two of a treated water flow rate measuring means for measuring the flow rate of the treated water in the reverse osmosis membrane treatment, a permeated water flow rate measuring means for measuring the flow rate of the permeated water, and a concentrated water flow rate measuring means for measuring the flow rate of the concentrated water
  • the control means controls the addition concentration of the scale dispersant based on any two of the following three values: the aluminum ion concentration in the treated water measured by the aluminum ion concentration measuring means, the flow rate of the treated water measured by the treated water flow rate measuring means, the flow rate of the permeated water measured by the permeated water flow rate measuring means, and the flow rate of the concentrated water measured by the concentrated water flow rate measuring means.
  • the water treatment device further comprises a flocculation treatment means upstream of the reverse osmosis membrane treatment means, and uses an aluminum-containing flocculating agent as the flocculating agent for the flocculation treatment means.
  • Example 1 and Comparative Example 1 A water flow test was carried out using an experimental apparatus shown in FIG. 4 having a 4-inch reverse osmosis membrane element.
  • simulated water was used, which was prepared by simulating surface water that would be the pure raw water.
  • concentration of ionic silica in the water to be treated was adjusted to 33 mg/L using sodium metasilicate, and the concentration of aluminum ions was adjusted to the predetermined concentrations shown in Table 1 using aluminum chloride.
  • the concentration of calcium ions in the water to be treated was adjusted to 120 mg/L to 240 mg/L using calcium chloride, the concentration of bicarbonate ions was adjusted to 32 mg/L using sodium bicarbonate, and the pH was adjusted to 6.5 using hydrochloric acid so that the Langelier index was less than 0 ( ⁇ 0.62).
  • Water was passed through the reverse osmosis element at a room temperature of 25 ⁇ 3° C. The flow rate of the permeate was measured using a flowmeter (permeation flow rate sensor), and the flow rate of the concentrated water was measured using a flowmeter (concentrated flow rate sensor). The operation was performed so that the flow rate of the permeate was 140 L/h and the flow rate of the concentrated water was 60 L/h.
  • the corrected flux retention rate (retention rate relative to the initial value) versus operating time (h) obtained by the experiment is shown in FIG. 5.
  • the stable operation period was evaluated according to the following criteria. The results are shown in Table 1.
  • Example 2 Using the test device of Example 1, a water flow test was performed to control the amount of scale dispersant added depending on the aluminum concentration.
  • the same simulated water as in Example 1 was used as the water to be treated.
  • the aluminum concentration of the concentrated water of the reverse osmosis membrane was changed to 0.17 mg/L and 0.29 mg/L.
  • Example 2 when the aluminum concentration of the concentrated water was 0.17 mg/L, the scale dispersant was added so that the concentration in the concentrated water was 6.7 mg/L, and when it was 0.29 mg/L, the scale dispersant was added so that the concentration in the concentrated water was 100 mg/L.
  • Example 3 the scale dispersant was added so that the concentration in the concentrated water was 6.7 mg/L regardless of the aluminum concentration.
  • the aluminum concentration of the water to be treated was measured using an inductively coupled plasma mass spectrometry (ICP-MS) device (7850 ICP-MS, manufactured by Agilent) as an aluminum ion concentration measuring device.
  • ICP-MS inductively coupled plasma mass spectrometry
  • the corrected flux retention rate (retention rate relative to the initial value) versus operation time (h) is shown in FIG. 6.
  • Example 2 the decrease in flux was suppressed compared to Example 3 by controlling the amount of scale dispersant added according to the aluminum concentration.
  • the embodiment was able to suppress the deposition of scale in water treatment using reverse osmosis membrane treatment of water to be treated that contains silica and aluminum.

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

Abstract

L'invention concerne un procédé et un dispositif de traitement des eaux avec lesquels il est possible d'inhiber la précipitation du tartre par un traitement par membrane d'osmose inverse sur une eau soumise à un traitement contenant de la silice et de l'aluminium. Le procédé de traitement des eaux comprend une étape de traitement par membrane d'osmose inverse consistant à faire passer de l'eau soumise à un traitement contenant de la silice et de l'aluminium à travers une membrane d'osmose inverse pour obtenir de l'eau de perméation et de l'eau concentrée, la concentration de silice de l'eau concentrée étant égale ou inférieure à la solubilité et la concentration d'aluminium étant supérieure à 0,1 mg/l, un agent dispersant de tartre contenant un copolymère d'acide acrylique et d'acide 2-acrylamido-2-méthylpropanesulfonique étant ajouté à l'eau à traiter.
PCT/JP2024/000378 2023-02-06 2024-01-11 Procédé et dispositif de traitement des eaux Ceased WO2024166591A1 (fr)

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JP2023016266A JP2024111642A (ja) 2023-02-06 2023-02-06 水処理方法および水処理装置
JP2023-016266 2023-02-06

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Citations (10)

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Publication number Priority date Publication date Assignee Title
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WO2006033450A1 (fr) * 2004-09-24 2006-03-30 Kurita Water Industries Ltd. Inhibiteur d’encrassement par la silice et méthode de prévention de l’encrassement
JP2015174082A (ja) * 2014-03-18 2015-10-05 栗田工業株式会社 水処理用分散剤及び水処理方法
JP2016179442A (ja) * 2015-03-24 2016-10-13 三菱レイヨンアクア・ソリューションズ株式会社 逆浸透膜処理方法
WO2017158887A1 (fr) * 2016-03-18 2017-09-21 栗田工業株式会社 Procédé de fonctionnement et de gestion d'un dispositif à membrane d'osmose inverse, et système de traitement à membrane d'osmose inverse
WO2018163468A1 (fr) * 2017-03-07 2018-09-13 栗田工業株式会社 Procédé de gestion de fonctionnement d'un dispositif à membrane d'osmose inverse, et système de traitement à membrane d'osmose inverse
WO2019111474A1 (fr) * 2017-12-07 2019-06-13 栗田工業株式会社 Procédé de suppression du tartre de silice sur membrane d'osmose inverse
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