WO2017183130A1 - Procédé de nettoyage de dispositif filtrant, équipement de filtration et installation de dessalement - Google Patents

Procédé de nettoyage de dispositif filtrant, équipement de filtration et installation de dessalement Download PDF

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Publication number
WO2017183130A1
WO2017183130A1 PCT/JP2016/062493 JP2016062493W WO2017183130A1 WO 2017183130 A1 WO2017183130 A1 WO 2017183130A1 JP 2016062493 W JP2016062493 W JP 2016062493W WO 2017183130 A1 WO2017183130 A1 WO 2017183130A1
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WIPO (PCT)
Prior art keywords
filtration
filtration device
cleaning liquid
biofilm
layer
Prior art date
Application number
PCT/JP2016/062493
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English (en)
Japanese (ja)
Inventor
嘉晃 伊藤
中村　耕三
Original Assignee
三菱重工業株式会社
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Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to PCT/JP2016/062493 priority Critical patent/WO2017183130A1/fr
Publication of WO2017183130A1 publication Critical patent/WO2017183130A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • 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
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • 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
    • 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 disclosure relates to a cleaning method for a filtration device that removes the fixed matter fixed to a filtration layer, and a filtration processing facility and a desalination plant having a configuration for carrying out this cleaning method.
  • a filtration device that filters turbid components (floating particulates) in raw water by flowing raw water through a filter layer filled with a filter medium such as anthracite or silica sand is known.
  • Filtration devices are often used in various water treatment plants such as a desalination plant as a pretreatment facility for a reverse osmosis membrane device, for example.
  • Patent Document 1 describes that backwashing is performed using filtered water that has been filtered in the filtration step as backwashing water.
  • Patent Document 2 describes that before performing backwashing, air is blown into the filtration layer in a state where raw water is discharged from the filtration device, and the adhered matter attached to the filtration layer is peeled off.
  • a polymer flocculant may be added to the raw water introduced into the filtration device.
  • a polymer flocculant is added in order to suppress deterioration of the quality of filtered water when the reverse osmosis membrane device is heavily loaded.
  • the polymer flocculant is fixed on the inlet side of the filtration layer, and it is difficult to peel off the fixed substance only by backwashing.
  • Patent Document 2 when air is blown into the filtration layer, it is necessary to provide an air cleaning facility such as a blower or piping for supplying air, which increases costs and installation space. In addition, it is necessary to drain water from the filtration device before blowing air, and there is a problem that the cleaning time becomes long.
  • An object of at least some embodiments of the present invention is to provide a filtration device cleaning method, a filtration treatment facility, and a desalination plant that can easily remove the solid matter of a filtration layer by a polymer flocculant added to raw water. Is to provide.
  • a cleaning method for a filtration device includes: A washing method for a filtration apparatus in which a fixed substance of a polymer flocculant is fixed to an inlet portion of a filtration layer, Supplying the cleaning liquid to the filtration device so that at least the inlet of the filtration layer is immersed in a cleaning liquid containing an alkaline solution; Removing the fixed matter immersed in the cleaning liquid from the filtration layer; Is provided.
  • the fixed substance mainly composed of a polymer swells by supplying the cleaning liquid to the filtration device so that at least the inlet of the filtration layer is immersed in the cleaning liquid containing the alkaline solution. And the adhering force of the adhering matter to the filtration layer can be reduced. Thereby, a fixed thing can be peeled from a filtration layer, and can be removed easily. Further, it is not necessary to add equipment such as an air cleaning equipment for blowing air into the filtration layer to separate the fixed matter, which is advantageous in terms of cost or installation space.
  • the fixed matter may be peeled off by physically applying an external force, such as backwashing, and removed from the filtration layer, or a physical force may be applied. Instead, the fixed material that has peeled itself may be removed from the filtration layer.
  • the filtration device is a first biofilm filtration device in which a biofilm is supported on the filtration layer, In the step of supplying the cleaning liquid, the inlet portion of the filtration layer of the first biofilm filtration device is selectively immersed in the cleaning liquid.
  • a typical biofilm filtration device is required to maintain an environment around a filtration layer on which microorganisms are supported in order to maintain the activity of microorganisms.
  • the inlet portion where the adhered substance of the polymer flocculant easily adheres in the filtration layer of the first biofilm filtration device is selectively immersed in the cleaning liquid. Microorganisms at sites not immersed in the cleaning liquid can maintain their activity without being killed. Thereby, the peelability of the fixed substance of the polymer flocculant can be improved without significantly reducing the biological treatment function in the first biofilm filtration device.
  • the cleaning liquid may be an amount that selectively immerses the inlet portion of the filtration layer, the supply amount of the cleaning liquid and the cleaning time can be reduced.
  • the first biofilm filtration device is configured to filter the raw water flowing upward through the filtration layer
  • the cleaning liquid is supplied from a lower part of the first biofilm filtration device so that the cleaning liquid is accumulated in the first biofilm filtration device up to a height of the inlet portion of the filtration layer.
  • the first biofilm filtration device is configured to filter the raw water flowing upward through the filtration layer. For this reason, the fixed substance of the polymer flocculant is easily formed below the first biofilm filtration device. Therefore, by supplying the cleaning liquid from the lower part of the first biological membrane filtration device so that the cleaning liquid is accumulated in the first biological membrane filtration device up to the height of the inlet portion of the filtration layer, only the inlet portion where solid matter is easily formed is provided. Can be easily brought into contact with the cleaning liquid.
  • a second biofilm filtration device in which a biofilm is supported on a filtration layer is provided on the upstream side of the filtration device,
  • the adhering matter adhering to the inlet portion of the filtration layer of the filtration device is between the second biofilm filtration device and the filtration device during the operation of the second biofilm filtration device and the filtration device. It is a fixed substance of the added polymer flocculant.
  • the cleaning liquid is supplied to the filtration device provided on the downstream side of the second biofilm filtration device, the cleaning solution does not flow into the second biofilm filtration device, and the second The influence of the cleaning agent on the microorganisms supported on the filtration layer of the biofilm filtration device can be reduced. Therefore, the biological treatment function by microorganisms can be maintained high in the second biofilm filtration device.
  • the filtration device to be cleaned provided on the downstream side of the second biofilm filtration device mainly has a coagulation function, and thus the filtration layer is fixed by the polymer flocculant. By supplying the cleaning liquid as in 3), the fixed matter can be easily removed.
  • the polymer flocculant is not supplied to the 2nd biofilm filtration apparatus, a fixed substance is hard to generate
  • any of the above methods (1) to (4) In the step of removing the sticking matter, backwashing water is supplied to the filtration device, and the sticking matter is peeled off from the filtration layer by backwashing using the backwashing water.
  • the filtration layer can be obtained by combining immersion with a cleaning solution containing an alkaline solution and backwashing with backwashing water. It is possible to surely remove the fixed matter fixed to the surface. As a result, it is possible to reduce the introduction cost of the air cleaning equipment, and it is possible to shorten the cleaning operation time and improve the operating rate of the filtration device by not performing the air cleaning operation that requires the water draining process. .
  • the pH of the cleaning liquid is 10 or more and 13 or less.
  • the fixed matter formed by the polymer flocculant can be appropriately removed by setting the pH of the cleaning solution containing the alkaline solution to 10 or more and 13 or less.
  • the cleaning liquid further includes a dispersant.
  • the cleaning liquid contains the dispersant, it is possible to prevent the fixed matter peeled off from the filtration layer from reattaching to the filtration layer. Thereby, the removal rate of the adhering matter from the filtration layer can be improved.
  • the filtration equipment is: A filtration device having a filtration layer for filtering raw water; On the upstream side of the filtration device, a polymer flocculant injecting section for injecting the polymer flocculant into the raw water, A cleaning liquid supply unit for supplying the cleaning liquid to the filtration device such that at least an inlet of the filtration layer is immersed in a cleaning liquid containing an alkaline solution; Is provided.
  • the inlet portion of the filtration layer is immersed in the cleaning solution containing the alkaline solution even if the solid matter derived from the polymer flocculant is generated at the inlet portion of the filtration layer of the filtration device.
  • the fixed matter mainly composed of a polymer swells, and the fixing force of the fixed matter to the filtration layer can be reduced.
  • equipment such as an air cleaning equipment for blowing air into the filtration layer to separate the fixed matter, which is advantageous in terms of cost or installation space.
  • it may be removed from the filtration layer by physically applying force externally, such as backwashing, without removing physical force.
  • the fixed matter that has been peeled by itself may be removed from the filtration layer.
  • the filtration device is a first biofilm filtration device configured to filter the raw water flowing upward through the filtration layer, and a biofilm supported on the filtration layer
  • the cleaning liquid supply unit is configured to supply the cleaning liquid from a lower part of the first biofilm filtration device.
  • a typical biofilm filtration device is required to maintain an environment around a filtration layer on which microorganisms are supported in order to maintain the activity of microorganisms.
  • the first biofilm filtration device is configured to filter the raw water flowing upward, and the cleaning liquid supply unit is provided from the lower part of the first biofilm filtration device. Since the cleaning solution is supplied, if the supply amount of the cleaning solution is appropriately adjusted, the inlet portion (the filtration layer of the filtration layer) to which the adhered substance of the polymer flocculant easily adheres in the filtration layer of the first biofilm filtration device. The lower part) can be selectively immersed in the cleaning liquid.
  • the activity of the microorganisms that are not immersed in the cleaning solution is maintained without being killed.
  • the peelability of the fixed substance of the polymer flocculant can be improved without significantly reducing the biological treatment function in the first biofilm filtration device.
  • the cleaning liquid supply unit is configured to set a supply amount of the cleaning liquid so that the cleaning liquid is accumulated in the first biofilm filtration device up to a height of the inlet portion of the filtration layer.
  • the cleaning liquid is supplied from the lower part of the first biofilm filtration device so that the cleaning liquid is accumulated in the first biofilm filtration device up to the height of the inlet portion of the filtration layer. Only the inlet portion where the kimono is easily formed can be selectively brought into contact with the cleaning liquid. The peelability of the polymer flocculant fixed matter can be improved without significantly reducing the biological treatment function of the first biofilm filtration device.
  • the filtration treatment facility is A second biofilm filtration device located upstream of the filtration device, wherein the biofilm is supported on the filtration layer; An intermediate line for guiding filtered water from the second biofilm filtration device to the filtration device,
  • the polymer flocculant injecting unit is configured to inject the polymer flocculant into the intermediate line.
  • the second biofilm filtration device since the second biofilm filtration device is provided on the upstream side of the filtration device, it is possible to efficiently remove suspended substances including organic matter. Moreover, since the polymer flocculant is injected into the downstream side (that is, the intermediate line) of the second biofilm filtration device, aggregates derived from the polymer flocculant are not deposited on the second biofilm filtration device. For this reason, the rise in the differential pressure across the second biofilm filtration device can be suppressed, and the filtration efficiency of the second biofilm filtration device can be maintained over a long period of time.
  • the cleaning liquid supply unit is configured to supply the cleaning liquid to the filtration device via the intermediate line.
  • the second biofilm filtration device since the cleaning liquid is injected into the intermediate line on the downstream side of the second biofilm filtration device and the upstream side of the filtration device to be cleaned, the second biofilm filtration device has Since the cleaning liquid does not flow, the influence of the cleaning agent on the microorganisms supported on the filtration layer of the second biofilm filtration device can be avoided. Therefore, the biological treatment function by microorganisms can be maintained high in the second biofilm filtration device.
  • the filtration device to be cleaned provided on the downstream side of the second biofilm filtration device is mainly responsible for the coagulation treatment function, so that the filtration layer is fixed by the polymer flocculant, but the filtration through the intermediate line By supplying the cleaning liquid to the inlet of the layer, the fixed matter can be easily removed.
  • the pH of the cleaning liquid is 10 or more and 13 or less.
  • the fixed matter formed by the polymer flocculant can be appropriately removed by setting the pH of the cleaning solution containing the alkaline solution to 10 or more and 13 or less.
  • the cleaning liquid further includes a dispersant.
  • the cleaning liquid contains the dispersant, it is possible to prevent the fixed matter peeled off from the filtration layer from reattaching to the filtration layer. Thereby, the removal rate of the adhering matter from the filtration layer can be improved.
  • a desalination plant includes: A filtration treatment facility having any one of the constitutions (8) to (14); A reverse osmosis membrane facility that is located downstream of the filtration treatment facility and includes at least one reverse osmosis membrane device for separating filtrate from the filtration treatment facility into concentrated water and permeate; Is provided.
  • the fixed matter derived from the polymer flocculant is fixed to the inlet portion of the filtration layer of the filtration device. Even so, at least the inlet of the filtration layer is immersed in a cleaning liquid containing an alkaline solution, and the cleaning liquid supply unit supplies the cleaning liquid to the filtration device to swell the fixed matter mainly composed of a polymer, The fixing force of the fixed substance to the filtration layer can be reduced. Thereby, a fixed thing can be peeled from a filtration layer, and can be removed easily. Further, it is not necessary to add equipment such as an air cleaning equipment for blowing air into the filtration layer to separate the fixed matter, which is advantageous in terms of cost or installation space.
  • a cleaning liquid containing an alkaline solution is supplied to the filtration device, so that the fixed matter mainly composed of a polymer swells and is fixed to the filtration layer.
  • the adhesion of the kimono can be reduced.
  • equipment such as an air cleaning equipment for blowing air into the filtration layer to separate the fixed matter, which is advantageous in terms of cost or installation space.
  • the desalination plant 1 which concerns on some embodiment is located in the downstream of the filtration apparatus 100 containing the filtration apparatus 10 which filters raw
  • FIG. At least one reverse osmosis membrane device 16.
  • the filtration device 10 of the filtration treatment facility 100 includes a filter medium container 11 and one or more filtration layers 12 (12a, 12b) provided in the filtration container 11.
  • a plurality of filtration layers 12 (12a, 12b) are stacked in the vertical direction.
  • a carbon-based material such as anthracite is used as the filter medium of the upper filter layer 12a
  • a granular filter medium such as silica sand is used as the lower filter layer 12b.
  • a biofilm may be carried on at least one filtration layer 12 (12a, 12b) of the filtration device 10. That is, the microorganism may form a biofilm on the surface of the filter medium using organic nutrients in the raw water.
  • the filtration apparatus 10 to which the cleaning method according to the present embodiment is applied is not limited to the biofilm filtration apparatus.
  • Raw water (seawater) is supplied to the filtration device 10 by a pump 13.
  • the raw water introduced into the filtration device 10 passes through the filtration layer 12 from the inlet 12c of the filtration layer 12 toward the outlet 12d, and is discharged from the filtration device 10.
  • turbid components (floating particles) in the raw water are removed by the filtration layer 12.
  • the filtration apparatus 10 is a biofilm filtration apparatus, the dissolved organic substance etc. in raw
  • the filtrate discharged from the filtration device 10 is stored in the filtrate water tank 14 and then supplied to the reverse osmosis membrane device 16 by the pump 15.
  • another filtration device such as an ultrafiltration membrane or a microfiltration membrane may be provided between the filtration treatment facility 100 (filtration device 10) and the reverse osmosis membrane device 16.
  • the reverse osmosis membrane device 16 is configured to separate filtered water from the filtration layers 12a and 12b into concentrated water and permeated water using a reverse osmosis membrane.
  • a configuration in which one reverse osmosis membrane device 16 is provided is shown, but a configuration in which a plurality of reverse osmosis membrane devices 16 are connected in series or in parallel may be used.
  • the permeated water generated in this way is subjected to post-treatment and then supplied to the user as production water.
  • the application destination of the filtration processing equipment 100 which concerns on this embodiment is desalination. It is not limited to the plant 1. That is, the application destination is not particularly limited as long as the filtration treatment facility 100 according to the present embodiment has a configuration for filtering raw water through a filtration layer.
  • the raw water may be, for example, seawater, groundwater, rivers, lake water, treated wastewater, or factory wastewater. According to the above-described method, seawater can be desalinated, wastewater treated water, factory wastewater, etc. can be purified to obtain reused water, or clean water can be generated from rivers and lakes.
  • FIG. 2 to FIG. 5 are diagrams for explaining a specific configuration of the filtration treatment facility 100 and a cleaning method of the filtration device 10 according to each embodiment.
  • the filtration facility 100 may inject a polymer flocculant for adding the polymer flocculant to the raw water flowing into the filtration device 10.
  • a cleaning liquid supply unit 300 for supplying the cleaning liquid to the filtration device 10 so that at least the inlet portion 12c of the filtration layer 12 of the filtration device 10 is immersed in the cleaning liquid.
  • the polymer flocculant injection unit 200 is configured to inject the polymer flocculant into the raw water flowing into the filtration device 10 (including the permeated water from the second biological membrane filtration device 17 on the upstream side).
  • the polymer flocculant for example, an organic polymer flocculant such as a cationic polymer flocculant, an anionic polymer flocculant, or a nonionic polymer flocculant can be used.
  • the flocculant injection unit 200 includes the flocculant tank 210 in which the flocculant is stored, and the flocculant from the flocculant tank 210 is pressurized and injected into the raw water supply line 20.
  • a flocculant pump 220 for carrying out the operation.
  • the cleaning liquid supply unit 300 is configured to supply a cleaning liquid to the filtering device 10 when the filtering device 10 is cleaned.
  • the cleaning liquid here contains an alkaline solution, and has an action of swelling the fixed matter derived from the coagulant fixed to the inlet portion 12c of the filtration layer 12 and promoting the peeling of the fixed matter from the inlet portion 12c.
  • the cleaning liquid supply unit 300 includes a cleaning liquid tank 310 that stores the cleaning liquid, a cleaning liquid supply line 22 that communicates with the cleaning liquid tank 310, and the cleaning liquid via the cleaning liquid supply line 22.
  • a cleaning liquid pump 320 for pumping the cleaning liquid from the tank 310 to the filtration device 10.
  • the cleaning device 10 is supplied to the filtration device 10 so that at least the inlet portion 12c of the filtration layer 12 is immersed in the cleaning solution containing an alkaline solution. And a step of removing the fixed matter 19 immersed in the cleaning liquid from the filtration layer 12.
  • an alkaline solution contained in the cleaning liquid for example, an aqueous sodium hydroxide solution or an aqueous potassium hydroxide solution can be used.
  • the fixed matter 19 mainly composed of a polymer swells. And the adhering force of the adhering matter 19 to the filtration layer 12 can be reduced. Thereby, the fixed substance 19 can be peeled from the filtration layer 12, and can be removed easily. In addition, it is not necessary to add equipment such as an air cleaning equipment for blowing air into the filtration layer 12 to peel off the fixed matter 19, which is advantageous in terms of cost or installation space.
  • the fixed matter 19 may be peeled off by applying physical force from the outside, such as backwashing, and removed from the filtration layer 12. You may remove the fixed substance 19 which peeled by itself, without applying special force from the filtration layer 12.
  • the pH of the cleaning liquid supplied to the filtration device 10 may be 10 or more and 13 or less.
  • the fixed thing formed with the polymer flocculent can be removed appropriately by making pH of the washing
  • cleaning liquid supplied to the filtration apparatus 10 may further contain the dispersing agent in addition to the alkaline solution.
  • a surfactant may be used as the dispersant.
  • a phosphonate-based dispersant, a sulfonate-based dispersant, or the like can be used as the dispersant.
  • the filtration device 10 when the filtration device 10 is the first biofilm filtration device 10 in which the biofilm is supported on the filtration layer 12, in the step of supplying the cleaning liquid, the filtration layer of the first biofilm filtration device 10 is used.
  • the 12 inlet portions 12c may be selectively immersed in the cleaning liquid.
  • a typical biofilm filtration apparatus is required to maintain an environment around a filtration layer on which microorganisms are supported.
  • the inlet portion 12c to which the adhered substance 19 of the polymer flocculant easily adheres in the filtration layer 12 of the first biofilm filtration device 10 is selectively immersed in the cleaning liquid.
  • the activity can be maintained without killing the microorganisms at the site not immersed in the cleaning liquid.
  • the peelability of the fixed substance 19 of the polymer flocculant can be improved without significantly reducing the biological treatment function in the first biofilm filtration device 10.
  • the cleaning liquid may be an amount that selectively immerses the inlet portion 12c of the filtration layer 12, the supply amount of the cleaning liquid and the cleaning time can be reduced.
  • backwashing water may be supplied to the filtration device 10, and the sticking matter may be peeled off from the filtration layer by backwashing using the backwashing water.
  • the biofilm treatment according to the present embodiment is a biofilm filtration treatment in which pretreatment without chemical injection is performed in order to reduce the environmental burden due to the addition of chemicals such as iron-based flocculants to raw water. Is suitable for supplying a polymer flocculant as required.
  • the solid line indicates that the target fluid (raw water, cleaning liquid, backwash water, etc.) flows during normal operation of the filtration device 10
  • the broken line indicates the line of the filtration device 10. Indicates that the target fluid flows during cleaning.
  • FIG. 2 is a diagram illustrating a configuration of the filtration processing facility 100A according to the first embodiment and a cleaning method of the filtration device 10 thereof.
  • a raw water supply line 20 is connected to the top of the filtration device 10
  • a filtrate discharge line 21 is connected to the bottom.
  • the cleaning liquid supply unit 300 is provided with a cleaning liquid supply line 22 for supplying the cleaning liquid containing the alkaline solution described above from the top of the filtration device 10.
  • the cleaning liquid supply line 22 may be configured to supply the cleaning liquid to the raw water, or may be configured to supply the cleaning liquid directly to the top of the filtration device 10.
  • the filtering device 10 is provided with a backwashing water supply line 23 for supplying backwashing water upward from the bottom of the filtering device 10.
  • the filtration device 10 may be a biofilm filtration device.
  • raw water is supplied to the top of the filtration device 10 via the raw water supply line 20.
  • the raw water passes from the inlet portion 12 c located above the filtration layer 12 toward the outlet portion 12 d located below, and the filtered water is discharged from the bottom portion of the filtration device 10 through the filtrate water discharge line 21. Is done.
  • the raw material water is appropriately added by the polymer flocculant injection unit 200. A polymer flocculant is added to. For this reason, the fixed matter 19 in which the polymer flocculant is fixed to the filtration layer 12 is formed at the inlet portion 12 c above the filtration layer 12.
  • the cleaning solution is supplied from the top of the filtration device 10 by the cleaning solution supply unit 300 via the cleaning solution supply line 22.
  • the cleaning liquid supplied to the filtration device 10 flows from the inlet portion 12 c of the filtration layer 12 toward the outlet portion 12 d and is discharged from the bottom of the filtration device 10.
  • the supply of the cleaning liquid may be performed immediately before backwashing during normal operation.
  • the cleaning liquid may be mixed with the raw water and supplied to the filtration device 10.
  • the adhering matter 19 mainly composed of the polymer adhering to the filtration layer 12 swells, and the adhering force of the adhering matter 19 to the filtration layer 12 decreases.
  • the backwashing water is supplied from the backwashing water supply line 23, and the backwashing water is passed from the outlet portion 12d of the filtration layer 12 toward the inlet portion 12c. 19 is peeled from the filtration layer 12 and discharged from the filtration device 10.
  • the adhesion of the adhered material 19 to the filtration layer 12 can be reduced, and the adhered material 19 is filtered. It can be peeled off the layer 12 and easily removed. Moreover, it has the advantage that the existing installation can be used.
  • FIG. 3 is a diagram showing a configuration of the filtration processing facility 100B according to the second embodiment and a cleaning method of the filtration device 10 thereof.
  • the filtration device 10 is configured to filter raw water flowing upward through a filtration layer 12. That is, the raw water supply line 20 is connected to the bottom of the filtration device 10, and the filtered water discharge line 21 is connected to the top.
  • the filtration apparatus 10 is provided with a cleaning liquid supply line 22 for supplying the above-described cleaning liquid containing the alkaline solution from the bottom of the filtration apparatus 10.
  • the cleaning liquid supply line 22 may be configured to supply the cleaning liquid to the raw water, or may be configured to supply the cleaning liquid directly to the bottom of the filtration device 10.
  • the filtering device 10 is provided with a backwashing water supply line 23 for supplying backwashing water upward from the bottom of the filtering device 10.
  • the filtration device 10 may be a biofilm filtration device.
  • raw water is supplied to the bottom of the filtration device 10 via the raw water supply line 20.
  • raw water passes from the inlet portion 12 c located below the filtration layer 12 toward the outlet portion 12 d located above, and the filtered water is discharged from the top of the filtration device 10 via the filtrate drain line 21. Is done.
  • the raw material water is appropriately added by the polymer flocculant injection unit 200. A polymer flocculant is added to. For this reason, the fixed matter 19 in which the polymer flocculant is fixed to the filtration layer 12 is formed at the inlet 12 c below the filtration layer 12.
  • the cleaning liquid supply unit 300 causes the cleaning liquid to be accumulated in the filtration device 10 up to the height of the inlet portion 12 c of the filtration layer 12 from the lower part of the filtration device 10 via the cleaning liquid supply line 22. Supply cleaning solution.
  • the adhering matter 19 mainly composed of the polymer adhering to the filtration layer 12 swells, and the adhering force of the adhering matter 19 to the filtration layer 12 decreases. Then, after a predetermined time has elapsed, the cleaning liquid is discharged from the bottom of the filtration device 10.
  • the supply amount of the cleaning liquid may be set in the cleaning liquid supply unit 300 so that the cleaning liquid is accumulated in the filter medium container 11 up to the height of the inlet 12c of the filtration layer 12 of the filtration device 10.
  • the cleaning liquid pump 320 may be operated until the necessary cleaning liquid supply amount) is reached.
  • the operating time of the cleaning liquid pump 320 may be determined, and the cleaning liquid pump 320 may be operated for the operating time so that the set amount of cleaning liquid is supplied to the filtration device 10.
  • the inlet 12c of the filtration layer 12 of the filtration device 10 is selectively immersed in the cleaning liquid by appropriately setting the supply amount of the cleaning liquid by the cleaning liquid supply unit 300, and most of the filtration layer 12 is cleaned with the cleaning liquid. It can be made not to touch. Therefore, even if the filtration apparatus 10 is a biofilm filtration apparatus, the activity fall resulting from the contact with the washing
  • the backwashing water is supplied from the backwashing water supply line 23, and the backwashing water is passed from the inlet portion 12c of the filtration layer 12 toward the outlet portion 12d. 19 is peeled from the filtration layer 12 and discharged from the filtration device 10.
  • the adhesion of the adhered material 19 to the filtration layer 12 can be reduced, and the adhered material 19 is filtered. It can be peeled off the layer 12 and easily removed.
  • the inlet part in which the fixed matter 19 is easy to be formed by supplying the washing liquid from the lower part of the first biofilm filtration apparatus 10 so that the washing liquid is accumulated in the inside of the filtration apparatus 10 up to the height of the inlet part 12 c of the filtration layer 12. Only 12c can be easily brought into contact with the cleaning liquid.
  • FIG. 4 is a diagram illustrating a configuration of a filtration processing facility 100 ⁇ / b> C according to a modification of the second embodiment and a cleaning method for the filtration device 10.
  • the modification of 2nd Embodiment differs in the structure of the backwash water supply line 23 from 2nd Embodiment shown in FIG. That is, as shown in FIG. 4, the backwash water supply line 23 is configured to supply backwash water from the upper part of the filtration device 10. For this reason, the fixed object 19 can be easily discharged
  • FIG. 5 is a diagram illustrating a configuration of a filtration processing facility 100D according to the third embodiment and a cleaning method of the filtration device 10.
  • the filtration treatment facility 100D is provided with a second biofilm filtration device 17 on the upstream side of the filtration device 10.
  • the second biofilm filtration device 17 has a configuration in which a filter layer 18 carrying a biofilm is provided in the filter medium container 11.
  • the filtration device 10 has the same configuration as that of the first embodiment.
  • the filtration device 10 may have the same configuration as that of the second embodiment or the modification thereof.
  • the filtration device 10 may be a biofilm filtration device.
  • the polymer flocculant injection unit 200 is configured to add the polymer flocculant to the intermediate line 25 located between the second biofilm filtration device 17 and the filtration device 10.
  • the cleaning liquid supply unit 300 supplies the cleaning liquid to the filtration device 10 via the cleaning liquid supply line 22 and the intermediate line 25 when the filtration device 10 is cleaned.
  • the intermediate line 25 may be provided with a buffer tank 50 and a pump 60.
  • the polymer flocculant injection unit 200 may inject the polymer flocculant into the intermediate line 25 on the downstream side of the buffer tank 50 and the upstream side of the filtration device 10.
  • the polymer flocculant can be added directly to the filtered water supplied to the filtration device 10, and the polymer flocculant is placed between the second biofilm filtration device 17 and the buffer tank 50.
  • the polymer flocculant is added to the suction side of the pump 60 (that is, between the buffer tank 50 and the pump 60). You may do it.
  • the cleaning liquid supply line 22 of the cleaning liquid supply unit 300 may be connected to the intermediate line 25 on the downstream side of the buffer tank 50 and on the upstream side of the filtration device 10.
  • raw water is supplied to the top of the second biofilm filtration device 17 via the raw water supply line 20.
  • the raw water passes through the filtration layer 18, and the filtrate water is discharged from the bottom of the second biofilm filtration device 17.
  • the filtered water from the second biofilm filtration device 17 is supplied to the filtration device 10 via the intermediate line 25.
  • the raw water passes through the filtration layer 12, and the filtrate is discharged from the bottom of the filtration device 10 through the filtrate discharge line 21.
  • the sticking matter 19 attached to the inlet portion 12c of the filtration layer 12 of the filtration device 10 is in contact with the second biofilm filtration device 17 and the filtration device 10 during the operation of the second biofilm filtration device 17 and the filtration device 10.
  • the washing solution is supplied to the filtration device 10 via the washing solution supply line 22.
  • the cleaning liquid supplied to the filtration device 10 flows from the inlet portion 12 c of the filtration layer 12 toward the outlet portion 12 d and is discharged from the bottom of the filtration device 10.
  • the adhering matter 19 mainly composed of the polymer adhering to the filtration layer 12 swells, and the adhering force of the adhering matter 19 to the filtration layer 12 decreases.
  • the backwash water is supplied from the backwash water supply line 23 to the filtration device 10, and the fixed matter 19 whose adhesion is reduced is peeled off from the filtration layer 12 and discharged from the filtration device 10. Also in the second biofilm filtration device 17, backwash water is supplied from the backwash water supply line 26 to the second biofilm filtration device 17, and turbid components adhering to the filtration layer 18 are discharged.
  • the second biofilm filtration device 17 can maintain a high biological treatment function by microorganisms.
  • the filtration device 10 provided on the downstream side of the second biofilm filtration device 17 mainly has a coagulation treatment function, so that the filtration layer 12 is fixed by the polymer flocculant.
  • the fixed matter 19 can be easily removed.
  • the polymer flocculant is not supplied to the 2nd biofilm filtration apparatus 17, the fixed substance 19 cannot generate
  • a cleaning liquid containing an alkaline solution is supplied to the filtration device 10, thereby fixing the solid matter 19 mainly composed of a polymer. Swells, and the fixing force of the fixing material 19 to the filtration layer 12 can be reduced. Thereby, the fixed substance 19 can be peeled from the filtration layer 12, and can be removed easily. In addition, it is not necessary to add equipment such as an air cleaning equipment for blowing air into the filtration layer 12 to peel off the fixed matter 19, which is advantageous in terms of cost or installation space.
  • the present invention is not limited to the above-described embodiments, and includes forms obtained by modifying the above-described embodiments and forms obtained by appropriately combining these forms.
  • an expression indicating that things such as “identical”, “equal”, and “homogeneous” are in an equal state not only represents an exactly equal state, but also has a tolerance or a difference that can provide the same function. It also represents the existing state.
  • the expression “comprising”, “including”, or “having” one constituent element is not an exclusive expression for excluding the existence of another constituent element.

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

L'invention concerne un procédé de nettoyage pour un dispositif filtrant qui présente des dépôts d'un floculant polymère déposés au niveau d'une partie d'entrée d'une couche de filtre de celui-ci. Le procédé de nettoyage comprend : une étape pour amener un liquide de nettoyage, qui comprend une solution alcaline, dans le dispositif filtrant de telle sorte qu'au moins la partie d'entrée de la couche de filtre est immergée dans le liquide de nettoyage ; une étape pour éliminer, de la couche de filtre, les dépôts qui ont été immergés dans la solution de nettoyage.
PCT/JP2016/062493 2016-04-20 2016-04-20 Procédé de nettoyage de dispositif filtrant, équipement de filtration et installation de dessalement WO2017183130A1 (fr)

Priority Applications (1)

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Applications Claiming Priority (1)

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745317A (en) * 1980-09-03 1982-03-15 Tsukishima Kikai Co Ltd Washing method for filter cloth of dehydrator
JPS5912715A (ja) * 1982-07-15 1984-01-23 Ebara Infilco Co Ltd 急速ろ過池におけるろ材洗浄方法
JPH06198294A (ja) * 1993-01-06 1994-07-19 Ngk Insulators Ltd 生物膜濾過装置の洗浄方法及び装置
JPH0871318A (ja) * 1994-09-02 1996-03-19 Kurita Water Ind Ltd 濾過装置
JPH10258295A (ja) * 1997-03-18 1998-09-29 Kitakiyuushiyuushi 公共水道設備
JP2004089782A (ja) * 2002-08-29 2004-03-25 Sumitomo Heavy Ind Ltd 繊維状濾材の洗浄方法
JP2011189242A (ja) * 2010-03-12 2011-09-29 Miura Co Ltd 水処理システム
JP2014050806A (ja) * 2012-09-07 2014-03-20 Hitachi Ltd 海水淡水化システム

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5745317A (en) * 1980-09-03 1982-03-15 Tsukishima Kikai Co Ltd Washing method for filter cloth of dehydrator
JPS5912715A (ja) * 1982-07-15 1984-01-23 Ebara Infilco Co Ltd 急速ろ過池におけるろ材洗浄方法
JPH06198294A (ja) * 1993-01-06 1994-07-19 Ngk Insulators Ltd 生物膜濾過装置の洗浄方法及び装置
JPH0871318A (ja) * 1994-09-02 1996-03-19 Kurita Water Ind Ltd 濾過装置
JPH10258295A (ja) * 1997-03-18 1998-09-29 Kitakiyuushiyuushi 公共水道設備
JP2004089782A (ja) * 2002-08-29 2004-03-25 Sumitomo Heavy Ind Ltd 繊維状濾材の洗浄方法
JP2011189242A (ja) * 2010-03-12 2011-09-29 Miura Co Ltd 水処理システム
JP2014050806A (ja) * 2012-09-07 2014-03-20 Hitachi Ltd 海水淡水化システム

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