WO2021182480A1 - 水処理方法、水処理装置の制御装置、及び、水処理装置の制御プログラム - Google Patents

水処理方法、水処理装置の制御装置、及び、水処理装置の制御プログラム Download PDF

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Publication number
WO2021182480A1
WO2021182480A1 PCT/JP2021/009357 JP2021009357W WO2021182480A1 WO 2021182480 A1 WO2021182480 A1 WO 2021182480A1 JP 2021009357 W JP2021009357 W JP 2021009357W WO 2021182480 A1 WO2021182480 A1 WO 2021182480A1
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Prior art keywords
water
treated
layer
water treatment
granular material
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PCT/JP2021/009357
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English (en)
French (fr)
Japanese (ja)
Inventor
智仁 中川
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Metawater Co Ltd
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Metawater Co Ltd
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Priority to JP2022507227A priority Critical patent/JP7747617B2/ja
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    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds

Definitions

  • the present invention relates to a water treatment method, a control device for a water treatment device, and a control program for the water treatment device.
  • the water to be treated foams in the granular material-filled layer such as the activated carbon-filled layer
  • the voids of the granular material-filled layer are filled with bubbles to block the granular material-filled layer.
  • the present invention in a water treatment method in which water to be treated is passed through a granular material-filled layer to obtain treated water, it is possible to effectively prevent the granular material-filled layer from being blocked by air bubbles.
  • the purpose is to provide a method.
  • An object of the present invention is to solve the above problems advantageously, and the water treatment method of the present invention is a water treatment method in which water to be treated is passed through a granular material packing layer to obtain treated water.
  • the water depth of the water layer adjacent to the upper surface of the granular material-filled layer is set to be equal to or higher than the water depth at which the water to be treated does not foam in the water layer.
  • the present invention aims to advantageously solve the above problems, and the control device of the water treatment device of the present invention passes water to be treated through a granular material packing layer to obtain treated water.
  • a control device for a water treatment device comprising a water depth calculation adjusting device for setting the water depth of the water layer adjacent to the upper surface of the granular material filling layer to be equal to or higher than the water depth at which the water to be treated does not foam in the water layer. , Characterized by.
  • the present invention aims to solve the above problems advantageously, and the control program of the water treatment apparatus of the present invention passes the water to be treated through the granular material packing layer to obtain the treated water.
  • the water treatment apparatus is characterized by performing a step of determining the water depth of the water layer adjacent to the upper surface of the granular material-filled layer and the water depth at which the water to be treated does not foam in the water layer.
  • the water treatment method, the control device of the water treatment device, and the control program of the water treatment device of the present invention are not particularly limited, and decompose persistent pollutants in the water to be treated, for example, in a water purification plant or the like. It can be suitably used in the accelerated oxidation treatment which can be carried out for the purpose.
  • the water treatment method of the present invention is a water treatment method in which water to be treated is passed through a granular material-filled layer to obtain treated water, and the water depth of the aqueous layer adjacent to the upper surface of the granular material-filled layer is set to the aqueous layer or.
  • the granular material-filled layer is characterized in that the water depth is equal to or higher than the water depth at which foaming does not occur in the water to be treated. According to such a water treatment method of the present invention, it is possible to effectively suppress the blockage of the granular material packing layer by air bubbles.
  • the water treatment method according to the present invention is applied in the accelerated oxidation treatment has been described.
  • FIG. 1 shows a schematic configuration of an example of a typical water treatment apparatus that can be used when the water treatment method according to the present invention is applied in the accelerated oxidation treatment.
  • the water treatment device 100 includes an accelerated oxidation treatment tank 10 and a filtration tank 20.
  • the water treatment device 100 introduces the water to be treated into the water treatment device 100 by natural flow or pump water, and after contacting the water to be treated with hydrogen peroxide and ozone in the accelerated oxidation treatment tank 10, the water treatment device 100 is subjected to the treatment.
  • the treated water is provided to the filter tank 20 as treated water and discharged to the outside of the apparatus.
  • the introduction port side may be referred to as "front stage side” and the discharge port side may be referred to as "rear stage side”.
  • front stage side the introduction port side
  • discharge port side the discharge port side
  • rear stage side the mode in which the water treatment method according to the present invention is implemented in the water treatment apparatus 100 will be described, but the water treatment method according to the present invention is any in the apparatus for implementing the water treatment method. It is not limited by the presence or absence of physical components.
  • the water to be treated in the water treatment method of the present invention is not particularly limited, and examples thereof include raw water for tap water. More specifically, examples of the water to be treated include water taken from dams, rivers and the like, lake water, well water, spring water, groundwater and the like.
  • the water to be treated is subjected to accelerated oxidation treatment by being contacted with hydrogen peroxide and ozone in the accelerated oxidation treatment tank 10.
  • the accelerated oxidation treatment tank 10 is provided with an ozone contact tank 11 on the front stage side and a retention layer 12 on the rear stage side.
  • the ozone contact tank 11 has an ozone supply device 13 and a hydrogen peroxide injection device 14.
  • FIG. 1 illustrates, as an example, an embodiment in which the ozone contact tank 11 is mounted as a two-tank type component. Each of these two tanks is provided with an ozone supply device 13, and the tank on the rear stage side is provided with a hydrogen peroxide injection device 14 in addition to the ozone supply device 13.
  • the tank on the front stage side functions to contact and mix ozone and the water to be treated.
  • Part of the ozone that comes into contact with the water to be treated reacts with the substances to be decomposed in the water to be treated to decompose them, and the rest can be dissolved in the water to be treated.
  • the tank on the rear stage side of the ozone contact tank 11 functions to contact-mix ozone, water to be treated, and hydrogen peroxide. Then, in the tank on the rear stage side of the ozone contact tank 11, the reaction between ozone and hydrogen peroxide produces hydroxyl radicals having a stronger oxidizing power than ozone.
  • hydroxyl radicals substances to be decomposed in the water to be treated, particularly persistent substances, can be satisfactorily decomposed.
  • ozone is decomposed by the generation of the hydroxyl radicals, it is possible to prevent the amount of ozone in the water to be treated from becoming excessive.
  • the hydrogen peroxide injection device 14 provided in the tank on the rear stage side of the ozone contact tank 11 injects a predetermined amount of hydrogen peroxide into the water to be treated.
  • the amount of hydrogen peroxide injected may be a predetermined amount by a preliminary test or the like, or, for example, an amount determined at any time based on the amount of ozone added.
  • the injection amount of oxygen peroxide can be set so that the hydrogen peroxide concentration in the water to be treated is, for example, 5 mg / L or less.
  • the hydrogen peroxide injection device 14 can be mounted as a general chemical injection means that can be attached to a water treatment device without particular limitation.
  • a hydrogen peroxide storage tank, a supply pump, and the hydrogen peroxide injection device 14 can be mounted. It can be mounted by a flow control valve or the like.
  • the water to be treated which is contact-mixed with ozone and hydrogen peroxide, is retained in the ozone contact tank 11.
  • a part of the hydrogen peroxide injected into the water to be treated from the hydrogen peroxide injection device 14 is decomposed while the water to be treated passes through the ozone contact tank 11 to the retention tank 12 constituting the accelerated oxidation treatment tank 10. Will be done.
  • the water to be treated supplied to the filtration tank 20 via the accelerated oxidation treatment tank 10 contains hydrogen peroxide remaining without being decomposed in the accelerated oxidation treatment in the accelerated oxidation treatment tank 10.
  • the water to be treated that is contact-mixed with ozone in the ozone contact tank 11 may cause bubbles generated in the granular material packed layer 21 regardless of the content of hydrogen peroxide.
  • the water to be treated that has passed through the accelerated oxidation treatment tank 10 is passed through the granular material packing layer 21 to obtain treated water.
  • the water depth of the water layer adjacent to the upper surface of the granular material filling layer 21 needs to be set to a water depth X or more at which foaming does not occur in the water to be treated.
  • FIG. 1 illustrates how the water to be treated in the aqueous layer adjacent to the upper surface of the granular material filling layer 21 is foaming for the purpose of promoting understanding.
  • foaming does not occur in the water to be treated in the water layer adjacent to the upper surface of the granular material filling layer 21.
  • the water to be treated is applied from the upper surface side of the granular material filling layer 21 to the water layer adjacent to the upper surface of the granular material filling layer 21. It is preferable to supply. By doing so, it is possible to more effectively suppress the blockage of the granular material packing layer 21 by air bubbles.
  • Examples of the granular material constituting the granular material filling layer 21 include an adsorbent such as powdered activated carbon. Further, the granules constituting the granular material packing layer 21 may contain other granules capable of functioning as a decomposition catalyst such as powdered manganese dioxide and powdered iron (III) chloride. In the filtration tank 20, organic substances and the like remaining in the water to be treated can be adsorbed on an adsorbent such as powdered activated carbon.
  • the granules constituting the granular material packing layer 21 contain granules such as powdered manganese dioxide and powdered iron (III) chloride that can function as a decomposition catalyst, they remain in the water to be treated in the filtration tank 20. It is possible to decompose organic substances and the like.
  • the filter tank 20 is not particularly limited, and for example, a generally usable configuration such as an activated carbon filtration pond can be adopted.
  • gas may be generated due to the decomposition of hydrogen peroxide contained in the water to be treated on the surface of the granular material. More specifically, oxygen (O 2 ) and water (H 2 O) can be generated by the decomposition of hydrogen peroxide (H 2 O 2).
  • gas may be generated in the filtration tank 20 due to the water to be treated that is contact-mixed with ozone.
  • a gas such as oxygen is generated for some reason, the generation of bubbles can be suppressed if the generated gas such as oxygen is dissolved in the water to be treated.
  • the value of the oxygen solubility of the water to be treated is equal to or greater than the amount of oxygen generated and the generated oxygen can be dissolved in the water to be treated, the generation of bubbles can be suppressed.
  • the value of oxygen solubility in water depends on the water temperature and the water depth, the water layer adjacent to the upper surface of the granular material-filled layer 21 (in other words, the upper end of the granular material-filled layer 21) under a certain water temperature condition. By making the water depth of the above water deeper than a predetermined value, the generation of air bubbles can be suppressed.
  • the oxygen solubility (mg / L) corresponding to the water temperature of the water to be treated and the water depth X is based on the oxygen evolution amount (mg / L) calculated based on the hydrogen hydrogen concentration of the water to be treated.
  • the water depth X can be determined so that the oxygen solubility (mg / L) corresponding to the water temperature and the water depth X of the water to be treated increases.
  • the water depth X is determined so that the value of oxygen solubility exceeds the amount of oxygen generated, thereby foaming into the water to be treated. Can be suppressed more satisfactorily.
  • the water depth X corresponds to the distance from the upper surface of the granular material filling layer 21 to the water surface.
  • the bubbles are first generated on the upper surface of the granular material filling layer 21 (that is, the interface between the aqueous layer and the granular material filling layer 21), and then the bubble generation position is the granular material. It became clear that there was a tendency to move to the inside of the packed bed 21.
  • the present inventor can also suppress the generation of air bubbles inside the granular material filling layer 21 if the water depth X is set so as to suppress the generation of air bubbles on the upper surface of the granular material filling layer 21. I found it. In this way, by suppressing foaming on the upper surface (interface) of the granular material-filled layer 21, it is possible to satisfactorily suppress foaming in the granular material-filled layer 21 and clogging of the granular material-filled layer 21. Can be done.
  • the water depth of the water layer adjacent to the upper surface of the granular material filling layer 21, in other words, the water depth X can be set to a predetermined value by using, for example, a water depth adjusting device 22 that can be mounted by a valve. More specifically, the water depth X can be made shallow by increasing the opening degree of the valve constituting the water depth adjusting device 22, and conversely, the water depth X can be made deep by decreasing the opening degree.
  • the opening degree of the valve constituting the water depth adjusting device 22 can be determined in advance based on a preliminary test, a set flow rate of the water to be treated in the water treatment device 100, and the like.
  • the water depth is such that an appropriate water depth X is secured at the timing of reviewing the operating conditions of the water treatment device 100 or at the timing of some malfunction of the water treatment device 100 on a regular basis (for example, seasonally).
  • the water depth X can be adjusted by the adjusting device 22.
  • the value of the water depth X can be determined based on the water temperature, the oxygen solubility, the amount of oxygen generated, and the like.
  • the water depth X can be 1.2 m or more, or 1.5 m or more.
  • the water depth X is equal to or higher than the relevant value, it is possible to more effectively suppress the blockage of the granular material-filled layer by air bubbles caused by hydrogen peroxide.
  • the water treatment method of the present application has been described above with reference to the water treatment device 100 according to an example.
  • Various settings in the water treatment method of the present invention and various operations of the device components may be performed manually or automatically controlled according to a control program of the water treatment device of the present invention.
  • the control program of the water treatment apparatus of the present invention applies the water depth of the aqueous layer adjacent to the upper surface of the granular material-filled layer to the water treatment apparatus to obtain the treated water by passing the water to be treated through the granular material-filled layer.
  • the program is characterized in that the step of determining the water depth X at which foaming does not occur in the water to be treated is executed. By causing the water treatment device 100 to execute such a step of determining the water depth X, it is possible to effectively prevent the granular material-filled layer 21 provided in the water treatment device 100 from being blocked by air bubbles.
  • the water treatment apparatus 100 capable of preferably carrying out the water treatment method of the present application is not particularly limited, and may include, for example, any component as described below.
  • the water treatment device 100 may optionally include additional components such as a control device 30 and a water treatment information measuring device 40.
  • the control device 30 preferably includes a water treatment information acquisition unit 31, a hydrogen peroxide supply amount control device 32, and a water depth X calculation adjustment device 33.
  • the water to be treated information acquisition unit 31 is not particularly limited, and may be configured by an input / output port or the like.
  • the hydrogen peroxide supply amount control device 32 and the water depth X arithmetic adjustment device 33 are not particularly limited and may be configured by a CPU (Central Processing Unit) or the like, and although not shown, a built-in or external storage unit (for example). , Memory), etc.
  • the water depth X calculation adjusting device 33 controls the water depth adjusting device 22 so that the water depth is equal to or higher than the water depth X at which the water to be treated does not foam in the water layer, and the water layer is adjacent to the upper surface of the granular material filling layer 21. Adjust the water depth of.
  • the water to be treated information measuring device 40 is not particularly limited, and various sensors (for example, a turbidity meter and a water temperature) capable of acquiring information on the water to be treated, such as the water quality and temperature of the water to be treated, are not particularly limited. Can be equipped with a meter, etc.).
  • the water depth X arithmetic adjustment device 33 acquires information on the water quality of the water to be treated supplied to the accelerated oxidation treatment tank 10 from the water to be treated information acquisition unit 31, and the hydrogen peroxide supply amount control device 32 acquires the information on the water quality of the accelerated oxidation treatment tank 10. The amount of hydrogen peroxide supplied in can be obtained. Then, the water depth X arithmetic adjustment device 33 calculates the concentration (mg / L) of hydrogen peroxide in the water to be treated supplied to the filtration tank 20 based on the water quality information of the water to be treated, the amount of hydrogen peroxide supplied, and the like. Can be done.
  • the water depth X arithmetic adjustment device 33 can calculate the amount of oxygen generated (mg / L) when the total amount of such hydrogen peroxide is decomposed. Further, the water depth X calculation adjusting device 33 sets the oxygen solubility value (mg / L) at the water depth X under the water temperature of the water to be treated obtained from the water information measuring device 40 to be treated based on Henry's law. The water depth X can be determined so that the obtained value (mg / L) exceeds the oxygen evolution amount (mg / L).
  • the water depth X may be calculated by operating the various physical components described above by the water depth X determination program described below.
  • An example of such a water depth X determination program includes a step of acquiring the water temperature of the water to be treated (S1), a step of calculating the amount of oxygen generated from the hydrogen peroxide concentration of the water to be treated (S2), and the acquired water to be treated.
  • the oxygen solubility value (mg / L) when the water depth is X under the water temperature is calculated, and the obtained oxygen solubility value (mg / L) is the oxygen evolution amount (mg / L) calculated in the above step (S2).
  • the water depth X arithmetic adjustment device 33 is made to perform the step (S3) of determining the water depth X so as to exceed / L).
  • the water depth X determination program controls the water to be treated information acquisition unit 31 described above to acquire water information to be treated such as the water temperature of the water to be treated, and obtains the acquired water information to be treated to the water depth X arithmetic adjustment device 33.
  • the water to be treated information acquired by the water to be treated information acquisition unit 31 may be temporarily stored in a memory (not shown), and then processed by the water depth X arithmetic adjustment device 33 from the memory. It may be controlled to read water information.
  • each of the above programs may be recorded on a computer-readable recording medium. Using such a recording medium, it is possible to install the program on the computer.
  • the recording medium on which the program is recorded may be a non-transient recording medium.
  • the non-transient recording medium is not particularly limited, but may be, for example, a recording medium such as a CD-ROM or a DVD-ROM.
  • each of the above-mentioned programs may be provided by downloading via a network.

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
PCT/JP2021/009357 2020-03-13 2021-03-09 水処理方法、水処理装置の制御装置、及び、水処理装置の制御プログラム Ceased WO2021182480A1 (ja)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58128196A (ja) * 1982-01-27 1983-07-30 C T I Sci Syst:Kk 閉鎖海域および湖沼の水質悪化防止工法
JPH01203094A (ja) * 1988-02-05 1989-08-15 Shin Etsu Handotai Co Ltd 過酸化水素の除去方法
JPH0243515Y2 (https=) * 1985-10-31 1990-11-19
JP2010089046A (ja) * 2008-10-10 2010-04-22 Japan Organo Co Ltd 生物ろ過装置
WO2013084854A1 (ja) * 2011-12-05 2013-06-13 栗田工業株式会社 充填塔の逆洗方法
US20140112999A1 (en) * 2012-08-31 2014-04-24 Water Star, Inc. Method and apparatus for increasing the concentration of dissolved oxygen in water and aqueous solutions

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS58128196A (ja) * 1982-01-27 1983-07-30 C T I Sci Syst:Kk 閉鎖海域および湖沼の水質悪化防止工法
JPH0243515Y2 (https=) * 1985-10-31 1990-11-19
JPH01203094A (ja) * 1988-02-05 1989-08-15 Shin Etsu Handotai Co Ltd 過酸化水素の除去方法
JP2010089046A (ja) * 2008-10-10 2010-04-22 Japan Organo Co Ltd 生物ろ過装置
WO2013084854A1 (ja) * 2011-12-05 2013-06-13 栗田工業株式会社 充填塔の逆洗方法
US20140112999A1 (en) * 2012-08-31 2014-04-24 Water Star, Inc. Method and apparatus for increasing the concentration of dissolved oxygen in water and aqueous solutions

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