US20140377009A1 - Leak prevention system and method for a retention pond - Google Patents

Leak prevention system and method for a retention pond Download PDF

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Publication number
US20140377009A1
US20140377009A1 US14/312,358 US201414312358A US2014377009A1 US 20140377009 A1 US20140377009 A1 US 20140377009A1 US 201414312358 A US201414312358 A US 201414312358A US 2014377009 A1 US2014377009 A1 US 2014377009A1
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US
United States
Prior art keywords
liquid
membrane
pumping device
pond
draining
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US14/312,358
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English (en)
Inventor
Marc Lacazedieu
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Soletanche Freyssinet SA
Original Assignee
Soletanche Freyssinet SA
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Soletanche Freyssinet SA filed Critical Soletanche Freyssinet SA
Assigned to SOLETANCHE FREYSSINET reassignment SOLETANCHE FREYSSINET ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: LACAZEDIEU, MARC
Publication of US20140377009A1 publication Critical patent/US20140377009A1/en
Abandoned legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/18—Tanks for disinfecting, neutralising, or cooling sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D90/00—Component parts, details or accessories for large containers
    • B65D90/22—Safety features
    • B65D90/24—Spillage-retaining means, e.g. recovery ponds
    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B5/00—Artificial water canals, e.g. irrigation canals
    • E02B5/02—Making or lining canals
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D19/00—Axial-flow pumps
    • F04D19/02—Multi-stage pumps
    • F04D19/04—Multi-stage pumps specially adapted to the production of a high vacuum, e.g. molecular pumps
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21D—NUCLEAR POWER PLANT
    • G21D1/00—Details of nuclear power plant
    • G21D1/02—Arrangements of auxiliary equipment
    • G—PHYSICS
    • G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
    • G21C—NUCLEAR REACTORS
    • G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
    • G21C15/18—Emergency cooling arrangements; Removing shut-down heat
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E30/00—Energy generation of nuclear origin
    • Y02E30/30—Nuclear fission reactors

Definitions

  • the present invention relates to the leak prevention systems for retention ponds, in particular for ponds containing materials and products that can be polluting or contaminating products.
  • Such retention ponds are used to store various products provisionally or for long periods be they industrial residues, discharge products or trash, said products being capable of containing both solid and liquid elements.
  • the invention may be applied to retention ponds for contaminating, notably radioactive liquids.
  • the environmental constraints require limiting, if not completely avoiding a potential contamination of the ground on which the pond is arranged.
  • Such pond is conceived either by excavation or by erection of a peripheral delimitation berm, the pond comprising a concave bottom in both cases.
  • Such pond most often presents a rectangular general shape with horizontal dimensions of several tens or hundreds of meters and a depth of a few meters.
  • one or more membranes are arranged on the bottom of the pond before depositing products to be stored, such that the liquids are well retained and do not penetrate the ground under the membrane.
  • the membranes may be prone to leakage, notably owing to the fact that such membranes consist of several plastic material strips connected to each other by welding.
  • the invention provides a leak prevention system for a liquid retention pond, in particular for polluting or contaminating liquids, the system comprising:
  • the object of the invention is also a method used for a leak prevention system as described above, said method comprising the following steps:
  • FIG. 1 is a general sectional view of a first embodiment of the leak prevention system for a retention pond according to the invention.
  • FIG. 2 is a partial plan view of the system in FIG. 1 .
  • FIG. 3 shows a schematic view of the pumping device.
  • FIG. 4 shows chronograms illustrating the system operation.
  • FIG. 5 shows a second embodiment according to the invention.
  • FIG. 1 represents a retention pond 10 containing polluting or contaminating liquid 1 .
  • the liquid may be an industrial residue comprising chemical or radioactive products that is to be confined in such a retention pond. It should be noted that the invention equally applies when the retention pond is for storing solid products from which contaminating or polluting liquids may escape.
  • the pond is formed by excavation in the soil, the concave shape thereby obtained presents a foundation (labeled 90 ). Nonetheless, such a shape may also be obtained by erecting a berm all around the pond to form.
  • a sealing arrangement is installed on the bottom of the pond.
  • a first membrane is arranged on the foundation 90 of the pond, here named lower membrane 4 .
  • This membrane is made in synthetic material such as PVC, HDPE or other equivalent plastic material.
  • This membrane forms a flexible wall, still called ‘tarpaulin’, forming a barrier that is normally liquid-sealed.
  • the membrane is formed by the juxtaposition of several material strips of the type PVC which are connected to each other by hot welding, by a thermofusing method known per se.
  • imperfections may exist which lead to a non-desired liquid passageway, i.e. a leak.
  • a first layer of draining material here a granular material such as sand, is installed.
  • drains 6 are installed, each arranged substantially horizontally along the bottom of the pond and prolonged on either side by inclined portions along the border ramps.
  • the drains are arranged parallel alongside each other as illustrated in FIG. 2 in particular.
  • Each drain 6 has an end coupled to a secondary collector 63 disposed transversally to the drains 6 on the sand 2 .
  • draining material 2 is added over it to entirely cover the plurality of drains 6 .
  • a continuous layer of draining material 2 is hence formed, wherein the drains 6 are inserted.
  • a second membrane is arranged, here called upper membrane 3 , to cover the draining material on the entire surface of the pond.
  • the peripheral border of the upper membrane 3 is then joined to the peripheral border of the lower membrane 4 by welds 23 , which allows the formation of a normally sealed envelope 20 wherein an air vacuum may be created as seen in detail further.
  • Each secondary collector 63 is coupled to a primary collector 60 disposed outside the sealed envelope 20 , as explained below.
  • Each secondary collector 63 is coupled to a passage pipe 62 which passes through a sealing sleeve 64 arranged at the frontier between the interior and the exterior of the envelope, as illustrated in FIGS. 2 and 3 .
  • passage pipe 62 may be produced in two parts, an internal part up to the sleeve 64 which may or not be porous and a hermetic external part which connects the sleeve 64 to the primary collector 60 .
  • the system further comprises a pumping device 5 configured to be placed in communication which the plurality of drains 6 to create an air vacuum in the aforementioned sealed envelope 20 .
  • the pumping device 5 comprises a closed area called separation chamber 7 which includes an inlet 71 for the products to be pumped (air and/or liquid), an outlet for the backflow liquid products, and an air outlet for air expulsion to the outside of the separation chamber.
  • a liquid backflow pump 9 removes liquid from the lower part of the separation chamber and expels it towards a liquid backflow line 19 .
  • An air pump 8 sucks air inside the separation chamber and expels said inside air to the outside.
  • the pressure prevailing inside the separation chamber is lower than the atmospheric pressure, typically of the order of a few tenths of atmosphere, preferentially between and 3 tenths of atmosphere, or even advantageously less than a tenth of atmosphere.
  • the air pump 8 thus creates a more or less deep air vacuum in the separation chamber 7 .
  • the separation chamber is in fluid communication with the plurality of drains via the inlet line 61 and the collector piping 60 , the same air vacuum pressure substantially prevails inside the pipes forming the drains, the pressure losses along the drains are not significant, or not problematic. If no liquid passes through the upper membrane 3 or the lower membrane 4 , then the pumping device 5 only sucks a very limited quantity of air from the drains.
  • the liquid backflow pump 9 then sends back the leakage liquids towards the retention pond. It is preferably activated only when a liquid level sensor 13 indicates the presence of the liquid in the separation chamber.
  • the liquid level sensor 13 may for example provide a more elaborated information than a simple binary information, there may for example be several contactors on the reservoir height so as to be able to control the liquid backflow pump 9 as suitably as possible.
  • a check valve 11 is arranged on the intake line 61 of the pumping device, this valve being open when the pump operates, and this valve being configured to close when the air pump stops so as to maintain the air vacuum in the drain network.
  • a pressure sensor 12 is arranged in the proximity of the collector 60 or at the intake line 61 to monitor the pressure evolution, notably when the pump is deactivated.
  • the pumping device is disposed just above the upper level of the liquid 1 , the hydraulic losses are consequently very limited.
  • the system comprises a control unit 17 in charge of the activation of the liquid backflow pump and of the air pump activation cycling when such a cycling is required.
  • a draining synthetic complex layer 26 (hybrid material) is used.
  • This material is prefabricated, it either has the form of thin plates consisting of one or more macroporous synthetic materials forming a self-supporting structure, or the form of rolls of strips extending on several meters to be unrolled and laid down on the lower membrane 4 .
  • This synthetic complex layer 26 replaces the sand and the drains from the above-described embodiment, it may be composed of a geotextile material, not necessarily homogeneous, there may be structure reinforcements combined with a relatively porous flexible material.
  • the synthetic complex layer 26 is thus arranged in a continuous way on the entire surface of the pond between the upper membrane 3 and the lower membrane 4 placed continuously on the bottom of the pond.
  • a funnel is placed leading into a conventional collect pipe, for example a secondary collector 63 equivalent to the one illustrated above. All the conventional pipes, secondary collectors to reach the inlet of the pumping device are identical or similar to those above-described.
  • the pumping device 5 and the other elements, in particular the lower and upper membranes will not be described again as they are identical or similar to those above-described.
  • prefabricated draining material plates are installed alongside each other and/or one after the other to cover the whole bottom surface of the pond.
  • the inclined borders of the pond may also be equipped with such plates.
  • the upper membrane is arranged and welded on its periphery to the lower membrane to form the normally sealed envelope 20 as previously described for the first embodiment.
  • the prefabricated draining synthetic complex layer 26 has a limited thickness between for example 2 cm and 10 cm. It does not decrease significantly the volume of the basin.
  • the installation of the sealing device provided is particularly simple and may be implemented rapidly by unskilled staff, regardless of the size of the pond to protect.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Health & Medical Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Plasma & Fusion (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Sewage (AREA)
  • Tents Or Canopies (AREA)
US14/312,358 2013-06-24 2014-06-23 Leak prevention system and method for a retention pond Abandoned US20140377009A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1356000A FR3007433B1 (fr) 2013-06-24 2013-06-24 Systeme de prevention des fuites pour un bassin de retention et procede y relatif.
FR1356000 2013-06-24

Publications (1)

Publication Number Publication Date
US20140377009A1 true US20140377009A1 (en) 2014-12-25

Family

ID=49054822

Family Applications (1)

Application Number Title Priority Date Filing Date
US14/312,358 Abandoned US20140377009A1 (en) 2013-06-24 2014-06-23 Leak prevention system and method for a retention pond

Country Status (5)

Country Link
US (1) US20140377009A1 (fr)
EP (1) EP2818603A1 (fr)
JP (1) JP2015007629A (fr)
CA (1) CA2854506A1 (fr)
FR (1) FR3007433B1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10934675B2 (en) * 2019-05-06 2021-03-02 Fa-Te WU Soil drainage device
US11149394B2 (en) 2017-09-01 2021-10-19 James A. Hennis Pond sealing method

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345581A (en) * 1978-09-01 1982-08-24 Solmat Systems Ltd. Bottom construction of ponds particularly solar ponds
US4916937A (en) * 1986-06-23 1990-04-17 Robertson Barrier Systems Corporation Pressure barrier liner
US4923333A (en) * 1988-05-12 1990-05-08 Timmons Robert D Lysimeter for leak detection and method of assembly thereof
US5117677A (en) * 1990-08-17 1992-06-02 J.A.A.M. Revocable Trust Two-stage vacuum monitoring and leak detection system for liquid product containment facilities
US5487407A (en) * 1994-12-01 1996-01-30 Robertshaw Controls Company Solenoid controlled one-way valve
US5615978A (en) * 1994-05-19 1997-04-01 Obayashi Corporation Management system for water-barrier sheet
US7347646B2 (en) * 2002-09-30 2008-03-25 Aquatan (Pty) Limited Geotechnical barrier

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4404516A (en) * 1980-10-29 1983-09-13 Johnson Jr Victor R System for detecting leaks from liquid-containing reservoirs and conduits
US4439062A (en) * 1981-12-21 1984-03-27 American Colloid Co. Sealing system and method for sealing earthen containers
US5656239A (en) * 1989-10-27 1997-08-12 Shell Oil Company Method for recovering contaminants from soil utilizing electrical heating
JP2960821B2 (ja) * 1992-08-17 1999-10-12 株式会社大林組 遮水シート及びその破損部検出方法
US5462655A (en) * 1993-09-20 1995-10-31 Ladd; Michael Vehicle containment mat with vacuum recovery and recycle means
JPH08267032A (ja) * 1995-03-30 1996-10-15 Bando Chem Ind Ltd 遮水シートおよびそれを用いた遮水装置
US6648552B1 (en) * 1999-10-14 2003-11-18 Bechtel Bwxt Idaho, Llc Sensor system for buried waste containment sites

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4345581A (en) * 1978-09-01 1982-08-24 Solmat Systems Ltd. Bottom construction of ponds particularly solar ponds
US4916937A (en) * 1986-06-23 1990-04-17 Robertson Barrier Systems Corporation Pressure barrier liner
US4923333A (en) * 1988-05-12 1990-05-08 Timmons Robert D Lysimeter for leak detection and method of assembly thereof
US5117677A (en) * 1990-08-17 1992-06-02 J.A.A.M. Revocable Trust Two-stage vacuum monitoring and leak detection system for liquid product containment facilities
US5615978A (en) * 1994-05-19 1997-04-01 Obayashi Corporation Management system for water-barrier sheet
US5487407A (en) * 1994-12-01 1996-01-30 Robertshaw Controls Company Solenoid controlled one-way valve
US7347646B2 (en) * 2002-09-30 2008-03-25 Aquatan (Pty) Limited Geotechnical barrier

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11149394B2 (en) 2017-09-01 2021-10-19 James A. Hennis Pond sealing method
US10934675B2 (en) * 2019-05-06 2021-03-02 Fa-Te WU Soil drainage device

Also Published As

Publication number Publication date
EP2818603A1 (fr) 2014-12-31
JP2015007629A (ja) 2015-01-15
FR3007433B1 (fr) 2016-01-08
CA2854506A1 (fr) 2014-12-24
FR3007433A1 (fr) 2014-12-26

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AS Assignment

Owner name: SOLETANCHE FREYSSINET, FRANCE

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:LACAZEDIEU, MARC;REEL/FRAME:033259/0677

Effective date: 20140625

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION