WO1995003687A1 - Floating cover for an open reservoir for a liquid - Google Patents

Floating cover for an open reservoir for a liquid Download PDF

Info

Publication number
WO1995003687A1
WO1995003687A1 PCT/DK1994/000295 DK9400295W WO9503687A1 WO 1995003687 A1 WO1995003687 A1 WO 1995003687A1 DK 9400295 W DK9400295 W DK 9400295W WO 9503687 A1 WO9503687 A1 WO 9503687A1
Authority
WO
WIPO (PCT)
Prior art keywords
cover
reservoir
cover according
liquid
floating ring
Prior art date
Application number
PCT/DK1994/000295
Other languages
French (fr)
Inventor
Knud Carlsen
Original Assignee
Barslund, Jensen, Kristian
Pedersen, Birger, Kristian
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
Priority claimed from DK89193A external-priority patent/DK89193A/en
Application filed by Barslund, Jensen, Kristian, Pedersen, Birger, Kristian filed Critical Barslund, Jensen, Kristian
Priority to AU72272/94A priority Critical patent/AU7227294A/en
Publication of WO1995003687A1 publication Critical patent/WO1995003687A1/en

Links

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C3/00—Treating manure; Manuring
    • A01C3/02—Storage places for manure, e.g. cisterns for liquid manure; Installations for fermenting manure
    • A01C3/028—Covers, roofs or other structures for covering manure storage places
    • 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
    • B65D88/00—Large containers
    • B65D88/34—Large containers having floating covers, e.g. floating roofs or blankets

Definitions

  • the present invention relates to a floating cover for an open reservoir for a liquid, such as a reservoir for liquid manure, which cover is adapted to reduce evaporation from the surface of the liquid and comprises a layer of granulated material of a density which is less than that of the liquid contained in the reservoir, and which cover is provided with means for collection and diversion of rainwater falling on the cover, for example in the form of a waterproof sheet.
  • the cover will reduce the evaporation of nitrogen and ammonia, as a result of which the fertilizing value of the liquid manure is maintained to the greatest extent possible.
  • DK Patent Application No. 1674/91, cf. DK 167489 Bl discloses a floating cover, which is essentially of the above described type.
  • the prior art cover has a drawback in that the granulated material, in order to secure collection of rainwater from the surface of the cover as well as gases from the under ⁇ side thereof, must have a layer so designed that the layer has increasing thickness in the direction towards the center of the cover, and the top side of the layer must be sufficiently even.
  • the granulated material is secured in a safe and reliable manner and will be efficiently prevented from being blown towards one side in the open reservoir under the influence of a high wind, whereby its thickness might otherwise change after the cover has been positioned in place. Also, clogging of the reservoir during emptying is prevented, and the granulated material cannot be mixed with the contents of the reservoir during stirring.
  • the bag is partly or completely constituted by a net having meshes of sizes, which are inferior to the sizes of the particles of the granulated material.
  • the cover may be advantageous in that the net is secured to or contained in a substantially stronger carrier net of such strength that it becomes possible to pull up the entire cover from the reservoir.
  • An embodiment is advantageous in that the cover comprises a number of sections.
  • An additional embodiment is advantageous in that the cover at its outer rim or outer rims resting against the inner wall of the reservoir are secured to a floating ring, which may be divided into sections.
  • a higher degree of fluid-tightness is hereby achieved as compared to the known constructions.
  • the floating ring and the cover will rise and fall concurrently with the re- plenishment, and the floating ring may appropriately be made of a material, which has good wearing qualities for this movement, and the net should not envelop the floating cover. It is possible to make the cover of such strength that it becomes capable of carrying a person afloat, where ⁇ by accidents can be prevented.
  • the floating ring also pro ⁇ vides a firm hold on the cover as it is pulled up from the reservoir to be emptied of its contents, or when the con ⁇ tents must be stirred.
  • a further development of this embodiment is advantageous in that the size of the cover or of the sections and the filling with granulated material are so adapted that the floating ring or the floating ring sections are pushed out towards the inner wall of the reservoir, and in that the cover at a distance from the inner wall is forced down into a lower level as compared to the level of the floating ring or the floating ring sections.
  • the cover Since the cover has been just so dimensioned that a contact pressure is achieved along the inner wall of the reservoir, and the cover is lowest at a distance from the inner side of the reservoir, it is comparatively easy to provide means for diversion of rainwater falling on the cover, as well as means for collection and removal of the diverted rainwater.
  • the said means may therefore advantageously comprise at least one collecting sump having for example a pump and/or an outlet pipe.
  • the pump and/or the pipe is adapted to maintain such level of water in the collecting sump that the surface of the sheet is weighed down by the collecting sump and slopes towards the sump.
  • the collecting sump may advantageously be provided with sensors which are adapted to sound an alarm if liquid manure in a quantity exceeding a predetermined quantity is recorded.
  • Fig. 1 is a top plan view of an open, circular reservoir with a cover according to the invention
  • Fig. 2 is a vertical section of the reservoir illustrated in Fig. 1,
  • Fig. 3 is a top plan view of an open, circular reservoir, in a second embodiment of a cover according to the invention.
  • Fig. 4 is a vertical section of the reservoir illustrated in Fig. 3.
  • Figs. 1 and 2 illustrate an open reservoir having a wall 1, which is circular cylindrical.
  • the reservoir contains a liquid 2, for example liquid manure, and a cover 3 according to the present specification floats upon the liquid.
  • a floating ring 4 is secured to the rim of the cover 3.
  • the cover 3 consists of a granulated material 5, which is contained in a closed bag or membrane 6.
  • the granulated material 5 is distributed at equal thickness in the bag 6, which is constituted by a net having meshes of a size which is inferior to the particle size of the granulated material.
  • the particle size of the granulated material varies between 1 and 10 mm, whereby the spaces between the larger particles can be filled up by the smaller particles thus achieving the maximum packing possible of the material.
  • a carrier net 7 is secured to the net 6 to the effect that the cover 3 can be pulled up by means hereof, for example for the purpose of stirring and/or emptying the contents of the reservoir.
  • the carrier net 7 may, as illustrated in Fig. 1, consist of a number of ropes or cables, which are mutually gathered at the center of the reservoir and extend radially outwards towards the floating ring 4 and are connected hereto in a manner, which is not illustrated in detail.
  • the means for drainage of the rainwater comprise a water ⁇ proof sheet 8, for example of polyester, resting on the top side of the closed bag 6, and which is adapted to lead the water to a collecting sump 10 provided at a distance within the floating ring 4 to the effect that it will contribute to weighing down the cover 3 as well as the sheet 8 in ⁇ clining in the direction towards the collecting sump 10.
  • a water ⁇ proof sheet 8 for example of polyester
  • the means for removal of rainwater in the collecting sump comprise an immersion pump 11, capable of emptying the sump through an outlet pipe 12, the immersion pump 11 being regulated by an automatic gain control.
  • the automatic gain control may advantageously be adjusted to maintain a certain water level within the collecting sump 10 to the effect that its weight is at all times capable of weighing down the sheet 8 to a reasonable ex ⁇ tent so that the surface of the cover will at all times maintain the-necessary inclination towards the collecting sump.
  • Figs. 3 and 4 illustrate a second embodiment of the cover of the invention.
  • a flow line 7 extends diametrically in the reservoir, thus dividing the cover 3 into two sections of equal size.
  • means 8 have been provided for diversion of rainwater falling on the cover 3, as well as means 10, 11, 12 for collection and removal of the drained rainwater.
  • the collecting sump 10 is provided with sensors 10, which are adapted to sound an alarm if a pre ⁇ determined amount of liquid manure in the water is exceeded, thus causing an intervention in order to collect and remove the polluted water in accordance with current legislation concerning the environment.
  • the granulated material may for example be particles of foamed plastic, however it is advantageous if the granulated material is of the type LECA (Registered Trade ⁇ mark).

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Environmental Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Sewage (AREA)

Abstract

A cover (3) e.g. for liquid manure reservoirs consists of leca-granulate (5), which is enclosed in a net bag (6), which can be raised clear from the open reservoir during emptying or stirring. Mixing of the granulate (5) with the contents of the reservoir is thereby avoided. In addition, a safe and reliable cover, even during windy conditions, has been provided. Furthermore, accidents are prevented, and finally by placing a waterproof sheet (8) on the surface of the bag (6), rainwater can be collected, thus avoiding dilution of the contents of the reservoir.

Description

FLOATING COVER FOR AN OPEN RESERVOIR FOR A LIQUID
The present invention relates to a floating cover for an open reservoir for a liquid, such as a reservoir for liquid manure, which cover is adapted to reduce evaporation from the surface of the liquid and comprises a layer of granulated material of a density which is less than that of the liquid contained in the reservoir, and which cover is provided with means for collection and diversion of rainwater falling on the cover, for example in the form of a waterproof sheet.
The cover will reduce the evaporation of nitrogen and ammonia, as a result of which the fertilizing value of the liquid manure is maintained to the greatest extent possible.
DK Patent Application No. 1674/91, cf. DK 167489 Bl, discloses a floating cover, which is essentially of the above described type.
The prior art cover has a drawback in that the granulated material, in order to secure collection of rainwater from the surface of the cover as well as gases from the under¬ side thereof, must have a layer so designed that the layer has increasing thickness in the direction towards the center of the cover, and the top side of the layer must be sufficiently even.
Nor has any means for a fluid-tight relationship been pro¬ vided between the interior wall of the reservoir and the edge of the cover in the prior art cover, as a result of which there is a risk that rainwater may pass over the rim of the cover and down into the liquid manure to the effect that the manure is diluted with resulting reduction of its fertilizing value. There is the additional risk that under heavy gusts of winds manure may be forced upwards over the rim of the cover to the effect that liquid manure together with collected rainwater must be drained afterwards in an environmentally irresponsible manner.
Furthermore, DE Published Specification No. 27 12 709, describes a cover, in which is used a loose granulate of plastic bodies or balls floating on the surface without mutual connection, isolating against heat radiation.
This construction, however, has several drawbacks. First, the compressed plastic bodies or balls will float towards one end of the reservoir during windy conditions unless the layer is very thick. Second, when emptying the reservoir, clogging may occur. Third, stirring is problematic due to the fact that some bodies or balls, in spite of their lower weight, may get mixed with the contents of the reservoir.
It is therefore an object of the present invention to remedy the above described drawbacks in the prior art technique, and this object is achieved by means of a cover of the type described in the introduction, which is advan¬ tageous in that the granulated material is of homogeneous thickness and is contained in a closed bag.
In a cover of the above described kind the granulated material is secured in a safe and reliable manner and will be efficiently prevented from being blown towards one side in the open reservoir under the influence of a high wind, whereby its thickness might otherwise change after the cover has been positioned in place. Also, clogging of the reservoir during emptying is prevented, and the granulated material cannot be mixed with the contents of the reservoir during stirring.
In an advantageous embodiment of the cover the bag is partly or completely constituted by a net having meshes of sizes, which are inferior to the sizes of the particles of the granulated material.
Furthermore, the cover may be advantageous in that the net is secured to or contained in a substantially stronger carrier net of such strength that it becomes possible to pull up the entire cover from the reservoir.
An embodiment is advantageous in that the cover comprises a number of sections.
Thus, if a single section is removed, a stirring operation in the reservoir thus cleared becomes possible, and at the same time, as a result of the limited free surface of the reservoir, evaporation and foul smell from the remaining part of the total surface of the reservoir is avoided during the limited few days in which stirring takes place. This is important because a stirring operation naturally otherwise causes an additional evaporation.
There is the additional advantage that during emptying the maximum capacity of the reservoir is utilized, in contrast to the known constructions, wherein a large amount of the granulate may be sucked out as well and in addition hereto may also cause clogging.
An additional embodiment is advantageous in that the cover at its outer rim or outer rims resting against the inner wall of the reservoir are secured to a floating ring, which may be divided into sections.
A higher degree of fluid-tightness is hereby achieved as compared to the known constructions. The floating ring and the cover will rise and fall concurrently with the re- plenishment, and the floating ring may appropriately be made of a material, which has good wearing qualities for this movement, and the net should not envelop the floating cover. It is possible to make the cover of such strength that it becomes capable of carrying a person afloat, where¬ by accidents can be prevented. The floating ring also pro¬ vides a firm hold on the cover as it is pulled up from the reservoir to be emptied of its contents, or when the con¬ tents must be stirred.
A further development of this embodiment is advantageous in that the size of the cover or of the sections and the filling with granulated material are so adapted that the floating ring or the floating ring sections are pushed out towards the inner wall of the reservoir, and in that the cover at a distance from the inner wall is forced down into a lower level as compared to the level of the floating ring or the floating ring sections.
An improved fluid-tightness between the rim of the cover and inner wall of the reservoir is hereby achieved, and collection of rainwater falling on the cover has also be- come possible.
In open reservoirs the capacity is reduced considerably during heavy rain, which will dilute the contents of the reservoir, and it is therefore advantageous to provide a waterproof sheet, for example of polyester, on the top side of the closed bag.
Since the cover has been just so dimensioned that a contact pressure is achieved along the inner wall of the reservoir, and the cover is lowest at a distance from the inner side of the reservoir, it is comparatively easy to provide means for diversion of rainwater falling on the cover, as well as means for collection and removal of the diverted rainwater.
The said means may therefore advantageously comprise at least one collecting sump having for example a pump and/or an outlet pipe. In this connection it is advantageous that the pump and/or the pipe is adapted to maintain such level of water in the collecting sump that the surface of the sheet is weighed down by the collecting sump and slopes towards the sump.
The collecting sump may advantageously be provided with sensors which are adapted to sound an alarm if liquid manure in a quantity exceeding a predetermined quantity is recorded.
The invention will be explained in detail below with reference to the drawing, wherein:
Fig. 1 is a top plan view of an open, circular reservoir with a cover according to the invention,
Fig. 2 is a vertical section of the reservoir illustrated in Fig. 1,
Fig. 3 is a top plan view of an open, circular reservoir, in a second embodiment of a cover according to the invention, and
Fig. 4 is a vertical section of the reservoir illustrated in Fig. 3.
Figs. 1 and 2 illustrate an open reservoir having a wall 1, which is circular cylindrical. The reservoir contains a liquid 2, for example liquid manure, and a cover 3 according to the present specification floats upon the liquid. A floating ring 4 is secured to the rim of the cover 3. The cover 3 consists of a granulated material 5, which is contained in a closed bag or membrane 6.
The granulated material 5 is distributed at equal thickness in the bag 6, which is constituted by a net having meshes of a size which is inferior to the particle size of the granulated material.
The particle size of the granulated material varies between 1 and 10 mm, whereby the spaces between the larger particles can be filled up by the smaller particles thus achieving the maximum packing possible of the material.
A carrier net 7 is secured to the net 6 to the effect that the cover 3 can be pulled up by means hereof, for example for the purpose of stirring and/or emptying the contents of the reservoir.
The carrier net 7 may, as illustrated in Fig. 1, consist of a number of ropes or cables, which are mutually gathered at the center of the reservoir and extend radially outwards towards the floating ring 4 and are connected hereto in a manner, which is not illustrated in detail.
The means for drainage of the rainwater comprise a water¬ proof sheet 8, for example of polyester, resting on the top side of the closed bag 6, and which is adapted to lead the water to a collecting sump 10 provided at a distance within the floating ring 4 to the effect that it will contribute to weighing down the cover 3 as well as the sheet 8 in¬ clining in the direction towards the collecting sump 10.
The means for removal of rainwater in the collecting sump comprise an immersion pump 11, capable of emptying the sump through an outlet pipe 12, the immersion pump 11 being regulated by an automatic gain control.
The automatic gain control may advantageously be adjusted to maintain a certain water level within the collecting sump 10 to the effect that its weight is at all times capable of weighing down the sheet 8 to a reasonable ex¬ tent so that the surface of the cover will at all times maintain the-necessary inclination towards the collecting sump.
Figs. 3 and 4 illustrate a second embodiment of the cover of the invention. In this embodiment a flow line 7 extends diametrically in the reservoir, thus dividing the cover 3 into two sections of equal size. In each of the two parts of the cover 3, means 8 have been provided for diversion of rainwater falling on the cover 3, as well as means 10, 11, 12 for collection and removal of the drained rainwater.
If the cover 3 in this second embodiment is divided into two parts, there will be a flow line 7 for each part.
Unfortunately, reservoirs of the type described here are not always provided with inner walls having perfect curves, and as a result gaps between the rim of the cover 3 and the inner wall may occur, even when the rim of the cover is pressed against the inner wall. Under unfavorable conditions liquid manure may therefore force its way up¬ wards and above the rim of the cover 3, and liquid manure will then be collected in the collecting sump 10.
When the pump 11 then starts in order to empty the collect- ing sump 10, or the collecting sump is emptied through the outlet pipe 12, the liquid manure will be discharged from the collecting sump in an environmentally irresponsible manner.
To prevent this, the collecting sump 10 is provided with sensors 10, which are adapted to sound an alarm if a pre¬ determined amount of liquid manure in the water is exceeded, thus causing an intervention in order to collect and remove the polluted water in accordance with current legislation concerning the environment.
The granulated material may for example be particles of foamed plastic, however it is advantageous if the granulated material is of the type LECA (Registered Trade¬ mark).

Claims

1. Floating cover for an open reservoir for a liquid, such as a reservoir for liquid manure, which cover is for reducing evaporation from the surface of the liquid and comprises a layer of granulated material of a density which is less than that of the liquid contained in the reservoir, and which cover is provided with means for collection and diversion of rainwater falling on the cover, for example in the form of a waterproof sheet, characterized in that the granulated material (5) is of homogeneous thickness and is contained in a closed bag (6).
2. Cover according to claim 1, characterized in that the bag (6) is partly or completely constituted by a net having meshes of sizes, which are inferior to the sizes of the particles of the granulated material.
3. Cover according to claims 1-2, characterized in that the net (6) is secured to or contained in a substantially stronger carrier net (7), which is of such strength that the entire cover (3) can be pulled up from the reservoir.
4. Cover according to claims 1-3, characterized in that the cover (3) comprises a number of sections.
5. Cover according to any of the preceding claims, characterized in that the cover (3) at its outer rim or outer rims, resting against the inner wall (1) of the reservoir is secured to a floating ring (4), which may be divided into sections.
6. Cover according to any of the preceding claims, characterized in that the size of the cover (3) or of the sections and the filling with granulated material are adapted such that the floating ring (4) or the floating ring sections are pushed out towards the inner wall (1) of the reservoir, and in that the cover (3) at a distance from the inner wall (1) is forced down into a lower level as compared to the level of the floating ring (4) or of the floating ring sections.
7. Cover according to one or more of the preceding claims, characterized in that the cover (3) comprises a waterproof sheet (8), for example made of polyester, said sheet (8) resting on the surface of the closed bag (6).
8. Cover according to claim 7, characterized in that at least one collecting sump (10) having for example a pump and/or an outlet pipe (12) is provided at the lowest point of the cover (3).
9. Cover according to claim 8, characterized in that the pump (11) and/or the pipe (12) is adapted to maintain such level of water in the collecting sump (10) that the surface of the sheet (8) is weighed down by the collecting sump (10) and slopes towards same.
10. Cover according to any of the preceding claims, characterized in that the collecting sump (10) is provided with sensors, which are adapted to sound an alarm if liquid manure in a quantity exceeding more than a predetermined quantity is recorded in the water.
PCT/DK1994/000295 1993-07-30 1994-07-29 Floating cover for an open reservoir for a liquid WO1995003687A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU72272/94A AU7227294A (en) 1993-07-30 1994-07-29 Floating cover for an open reservoir for a liquid

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DK0891/93 1993-07-30
DK89193A DK89193A (en) 1993-07-30 1993-07-30 Cover for open tanks, eg slurry tanks
DK0021/94 1994-01-04
DK2194A DK170829B1 (en) 1993-07-30 1994-01-04 Cover for open tanks, for example slurry tanks

Publications (1)

Publication Number Publication Date
WO1995003687A1 true WO1995003687A1 (en) 1995-02-09

Family

ID=26063139

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/DK1994/000295 WO1995003687A1 (en) 1993-07-30 1994-07-29 Floating cover for an open reservoir for a liquid

Country Status (3)

Country Link
AU (1) AU7227294A (en)
DK (1) DK170829B1 (en)
WO (1) WO1995003687A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2794335A1 (en) * 1999-06-02 2000-12-08 Lionel Salaun Cover for dung hole has two floating watertight boxes and rain water keeping compartment
WO2003016178A1 (en) * 2001-08-06 2003-02-27 Zhenqi Song Oil storage tank equipped with a floating roof means of floating bed type
EP2530032A1 (en) * 2011-06-03 2012-12-05 Poseidon Concepts Limited Partnership Container cover

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1590877A (en) * 1925-08-17 1926-06-29 Black Wilbert Fire preventing and extinguishing means
US2359416A (en) * 1942-03-31 1944-10-03 Bethlehem Steel Corp Liquid storage tank
US3049261A (en) * 1959-05-22 1962-08-14 Standard Oil Co Floating blanket
DE2712709A1 (en) * 1977-03-23 1978-09-28 Martin Ing Grad Staemmler Covering for dung and liquid-manure silos - comprises a layer of polystyrene foam granules or flakes floating on the manure
USRE30146E (en) * 1964-06-26 1979-11-13 Howard D. Webb Floating cover for a liquid storage reservoir
DE3639993C1 (en) * 1986-11-22 1987-07-16 Reinhard Siedenburg Appliance for the treatment of liquid manure

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1590877A (en) * 1925-08-17 1926-06-29 Black Wilbert Fire preventing and extinguishing means
US2359416A (en) * 1942-03-31 1944-10-03 Bethlehem Steel Corp Liquid storage tank
US3049261A (en) * 1959-05-22 1962-08-14 Standard Oil Co Floating blanket
USRE30146E (en) * 1964-06-26 1979-11-13 Howard D. Webb Floating cover for a liquid storage reservoir
DE2712709A1 (en) * 1977-03-23 1978-09-28 Martin Ing Grad Staemmler Covering for dung and liquid-manure silos - comprises a layer of polystyrene foam granules or flakes floating on the manure
DE3639993C1 (en) * 1986-11-22 1987-07-16 Reinhard Siedenburg Appliance for the treatment of liquid manure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2794335A1 (en) * 1999-06-02 2000-12-08 Lionel Salaun Cover for dung hole has two floating watertight boxes and rain water keeping compartment
WO2003016178A1 (en) * 2001-08-06 2003-02-27 Zhenqi Song Oil storage tank equipped with a floating roof means of floating bed type
US7225942B2 (en) 2001-08-06 2007-06-05 Zhenqi Song Oil storage tank equipped with a floating bed type inner floating roof
EP2530032A1 (en) * 2011-06-03 2012-12-05 Poseidon Concepts Limited Partnership Container cover

Also Published As

Publication number Publication date
DK2194A (en) 1995-01-31
AU7227294A (en) 1995-02-28
DK170829B1 (en) 1996-02-05

Similar Documents

Publication Publication Date Title
US5297367A (en) Removable storm drainage cartridge
US6428870B1 (en) Subsurface fluid drainage and storage system and mat especially utilized for such system
US5531888A (en) Arrangement for separation of coarse matter and/or bulky solids in rainwater relief structures
WO2006102340A2 (en) Storm water filtration system
AU619578B2 (en) Method in the storage and collection of waste as well as waste container and waste sack or the like for carrying out the method
US5980761A (en) Filter system and a cartridge containing a cellular granular material
US11408162B2 (en) Underground stormwater storage system
JP2003507600A (en) A device that collects substances floating in certain water areas
US3962084A (en) Rain storing tank
WO1995003687A1 (en) Floating cover for an open reservoir for a liquid
WO2006032073A1 (en) Apparatus and method for receiving and storing recyclable product
WO1998040572A1 (en) Street sink
KR100370712B1 (en) A device of prevent outflow for waste water
EP3976895A1 (en) Underground stormwater storage system
EP0049292B1 (en) A gully with possibility for quick cleaning
KR102165649B1 (en) vortex-type rainwater storage system with trash trap
EP0520589B1 (en) Storage reservoir for environmentally harmful liquids and method of making such storage reservoir
JPS6230890Y2 (en)
CN218392529U (en) Concrete mixing plant sewage recovery utilizes device
CN220415369U (en) Radioactive waste disposal cave system
JPH0613870Y2 (en) Rainwater infiltration
JPH0674601B2 (en) Rainwater reservoir
CN212248615U (en) Gutter inlet device for automatically separating initial rainwater impurities by means of hydrodynamic force
CN208472829U (en) A kind of automatic collection rainwater reuse means
JP3450847B1 (en) A rainwater collecting device capable of collecting rainwater without depending on a rain gutter of a building, and a rainwater storage device using the same.

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AM AT AU BB BG BR BY CA CH CN CZ CZ DE DE DK ES FI FI GB GE HU JP KE KG KP KR KZ LK LT LU LV MD MG MN MW NL NO NZ PL PT RO RU SD SE SI SK SK TJ TT UA US UZ VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): KE MW SD AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
REG Reference to national code

Ref country code: DE

Ref legal event code: 8642

122 Ep: pct application non-entry in european phase
NENP Non-entry into the national phase

Ref country code: CA