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JP-2026075474-A - Water storage tank lining method

JP2026075474AJP 2026075474 AJP2026075474 AJP 2026075474AJP-2026075474-A

Abstract

[Problem] To purify the treated water stored in the water tank and prevent re-contamination. [Solution] A water tank lining method comprising the steps of: measuring the amount of water to be treated and the concentration of PFAS contained in the water stored in the water tank; designing the capacity of a removal device that removes PFAS from the water to be treated by passing the water through it, based on the amount of water and the concentration of PFAS contained; installing a temporary water tank or tank having a capacity greater than or equal to the amount of water stored; preparing the removal device; transferring the water to be treated from the water tank to the temporary water tank or tank; passing the water to be treated through the removal device; covering the inner surface of the empty water tank with a lining material to seal the PFAS adhering to the wall surface of the water tank; moving the water to be treated from which PFAS has been removed to the water tank; and removing the temporary water tank or tank and the removal device. [Selection Diagram] Figure 2

Inventors

  • 尾崎 慎一郎
  • 河野 浩之
  • 赤松 佑介
  • 内田 治文
  • 山門 隆雄
  • 太田 匡哉

Assignees

  • 前田建設工業株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (8)

  1. The steps include measuring the amount of water to be treated stored in the water tank and the concentration of PFAS, The steps include designing the capacity of a removal device that removes PFAS from the water to be treated by passing the water through it, based on the water volume and the PFAS concentration, The steps include installing a temporary water tank or tank having a capacity greater than or equal to the aforementioned water storage volume, The steps include preparing and installing the aforementioned removal device, The steps include transferring the water to be treated from the storage tank to the temporary water tank or tank, The steps include passing the water to be treated through the removal device, The steps include: covering the inner surface of the empty water tank with a lining material to seal the PFAS adhering to the wall surface of the water tank; The steps include transferring the treated water from which PFAS has been removed to the storage tank, The steps include removing the temporary water tank or tank and the removal device, A lining method for a water storage tank.
  2. The step of passing the water to be treated through the removal device is performed when moving the water to be treated from the storage tank to the temporary water tank or tank, passing the water through the removal device. A method for lining a water storage tank according to claim 1.
  3. The step of passing the water to be treated through the removal device is to pass the water to be treated stored in the temporary water tank or tank through the removal device and return it to the temporary water tank or tank. A method for lining a water storage tank according to claim 1.
  4. The step of transferring the water to be treated from the storage tank to the temporary water tank or tank is to transfer the water to be treated to the first temporary water tank or tank, The step of passing the water to be treated through the removal device is performed when moving the water to be treated from the first temporary water tank or tank to the second temporary water tank or tank, and passing the water to be treated through the removal device. A method for lining a water storage tank according to claim 1.
  5. The step of passing the water to be treated through the removal device is performed when moving the water to be treated from the storage tank to the first temporary water tank or tank, and passing it through the removal device. Furthermore, when moving the water to be treated from the first temporary water tank or tank to the second temporary water tank or tank, the water to be treated is passed through the removal device. A method for lining a water storage tank according to claim 1.
  6. The step of passing the water to be treated through the removal device is performed when moving the water to be treated from the storage tank to the temporary water tank or tank, and passing it through the removal device. Furthermore, the water to be treated stored in the temporary water tank or tank is passed through the removal device and returned to the temporary water tank or tank. A method for lining a water storage tank according to claim 1.
  7. The step of measuring the PFAS content of the treated water in the temporary water tank or tank before moving the treated water from which the PFAS has been removed to the storage tank, A method for lining a water storage tank according to any one of claims 1 to 6.
  8. The lining material is at least one selected from epoxy resin, vinyl ester resin, polyurea resin, and urea-urethane composite resin. A method for lining a water storage tank according to any one of claims 1 to 6.

Description

This invention relates to a lining method for water storage tanks. Patent Document 1 describes a portable system and method for treating PFAS (perfluoroalkyl substances and polyfluoroalkyl compounds) wastewater. A Method for PFAS Effect Treatment is disclosed. The system described in the document is installed on a portable platform such as a trailer, and PFAS wastewater is pumped up through a hose, purified by passing it through a Sediment Filter, Granular Activated Carbon (GAC), and Ion Exchange Regins (IX), and then stored in a Treated Water Holding Tank. U.S. Patent Application Publication No. 2021/0322951 This is a piping diagram of a water treatment system used when implementing the water storage tank lining method according to the first embodiment of the present invention.This is a flowchart illustrating the procedure for the lining method of a water storage tank according to the first embodiment of the present invention.This is an example of an adsorption curve obtained through an adsorption capacity verification test.This graph shows the dissolution test results for PFAS.This is a piping diagram of a water treatment system used when implementing the water storage tank lining method according to the second embodiment of the present invention.This is a flowchart illustrating the procedure for the lining method of a water storage tank according to a second embodiment of the present invention.This is a piping diagram of a water treatment system used when implementing the water storage tank lining method according to the third embodiment of the present invention.This is a flowchart illustrating the procedure for the lining method of a water storage tank according to a third embodiment of the present invention.This is a piping diagram of a water treatment system used when implementing the water storage tank lining method according to the fourth embodiment of the present invention.This is a flowchart illustrating the procedure for the lining method of a water storage tank according to the fourth embodiment of the present invention. Figure 1 is a piping diagram of a water treatment system used in implementing the water storage tank lining method according to the first embodiment of the present invention. The water storage tank 1 stores water to be treated. The water storage tank lining method involves removing PFAS and other substances from the water to be treated stored in the water storage tank 1, purifying it, and applying a lining to the inner wall surface of the water storage tank 1 to prevent re-contamination of the stored water due to PFAS leaching from the inner wall surface. Therefore, prior to lining, the water to be treated is removed from the water storage tank 1, and its purification is performed before or simultaneously with the lining. Here, the term "water requiring treatment" refers to the water stored in the water tank 1 that is subject to PFAS removal treatment. During the process of implementing the water tank lining method according to this embodiment, PFAS is removed from this water requiring treatment, resulting in clean water where PFAS is no longer dissolved or its concentration falls well below the standard value, thus requiring no further treatment. Even in this case, to indicate its identity, it will continue to be referred to as "water requiring treatment." In particular, when referring to water requiring treatment that has been purified and PFAS removed, it will be described as "water requiring treatment with PFAS removed" or "purified water requiring treatment." The water treatment system comprises, as its main components, two pumps, three filtration devices, four removal devices, a backwash water sedimentation tank, and a temporary water tank. In addition, the system includes control equipment (not shown), such as power supply and control panels, to operate, control, and monitor the status of each component. Pump 2 pumps the water to be treated from the water storage tank 1 and sends it to the various components of the water treatment system. The power source for pump 2 is not particularly limited, but in this embodiment, it is an electric motor. Furthermore, pump 2 may be a land-based pump with its body installed on land, a submersible pump that is immersed in the water to be treated in the water storage tank 1, or multiple pumps may be used in combination. Filtration device 3 is a filter that removes suspended solids (SS) from the water to be treated. The type of filtration device 3 is not particularly limited; it may use sand, diatomaceous earth, or filters such as sponges or membranes as filter media. Furthermore, while a backwashing type filter 3 is economical because the filter media can be reused, it is not necessarily required. In this embodiment, filtration device 3 is a backwashing type filter using sand as filter media, and two units are installed in parallel; however, the filtration capacity and number of filtration devices can be arbitrarily determined as needed.