US20130233806A1 - Device and a method for filtering stormwater - Google Patents

Device and a method for filtering stormwater Download PDF

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Publication number
US20130233806A1
US20130233806A1 US13/748,283 US201313748283A US2013233806A1 US 20130233806 A1 US20130233806 A1 US 20130233806A1 US 201313748283 A US201313748283 A US 201313748283A US 2013233806 A1 US2013233806 A1 US 2013233806A1
Authority
US
United States
Prior art keywords
filter unit
carrier
storm drain
stormwater
bottom portion
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
US13/748,283
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English (en)
Inventor
Niels Dannrup
Asko Päiviö
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.)
Optineo AB
Beyond Challenges LLC
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of US20130233806A1 publication Critical patent/US20130233806A1/en
Assigned to OPTINEO AB reassignment OPTINEO AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: Dannrup, Niels
Assigned to BEYOND CLEAN WATER AB reassignment BEYOND CLEAN WATER AB ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: OPTINEO AB
Abandoned legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/0401—Gullies for use in roads or pavements
    • E03F5/0403—Gullies for use in roads or pavements with a sediment trap
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/041—Accessories therefor
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/04—Gullies inlets, road sinks, floor drains with or without odour seals or sediment traps
    • E03F5/0401—Gullies for use in roads or pavements
    • E03F5/0404—Gullies for use in roads or pavements with a permanent or temporary filtering device; Filtering devices specially adapted therefor
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools

Definitions

  • the invention relates to a device and a method for filtering stormwater. More specifically the present invention relates to a device and a method for filtering stormwater inside a storm drain to remove pollutants from it.
  • Stormwater which also is called urban runoff, is surface runoff of rainwater, melted snow or ice, wash water or similar from different types of surfaces. Such surfaces can be parking lots, sidewalks, roofs, and similar surfaces, sometimes referred to as impervious surfaces. Water running off from such surfaces tends to become polluted by e.g. gasoline, oil, heavy metals, trash, fertilizers, pesticides and other pollutants. During rain these surfaces carry polluted stormwater to storm drains. Storm drains can be connected to a drainage system for discharge into receiving surface waters, such as a canal, river, lake, reservoir, sea, ocean, or other surface water, with or without treatment of the stormwater before discharge.
  • surface waters such as a canal, river, lake, reservoir, sea, ocean, or other surface water
  • Storm drains generally comprise a vertical pipe having an inlet, such as a horizontal grated inlet or a side inlet, being connected to a drainage system.
  • Such storm drains can comprise a catchbasin, also called sump or gully-pot, for catching small objects, such as sediment, sand, gravel, pebbles, twigs, trash and similar.
  • the catchbasin serves as a water-filled trap for trapping objects and prevent such objects from entering the subsequent drainage system.
  • catchbasins also prevent gases from the drainage system from escaping.
  • Storm water from the top of the catchbasin drains into the subsequent drainage system.
  • the catchbasins can be emptied by means of vacuum trucks at suitable time intervals.
  • An object of the present invention is to avoid the drawbacks and problems of the prior art devices.
  • the device and method according to the present invention result in a reliable and efficient filtering of stormwater as well as easy installation and replacement.
  • the present invention results in a possibility to monitor the device in an efficient manner.
  • the present invention relates to a device for filtering stormwater inside a storm drain, wherein the device comprises a filter unit and a floating carrier for carrying the filter unit, wherein the filter unit comprises a bottom portion and a top portion, and wherein the carrier comprises a recess for receiving the bottom portion of the filter unit, which recess extends axially through the carrier so that the filter unit can be arranged on top of the carrier while the bottom portion of the filter unit is arranged in the recess, whereby at least a part of the bottom portion of the filter unit is adapted to be arranged below a surface of the stormwater inside the storm drain when the device is arranged in a floating condition inside the storm drain, and through apertures extending radially from an outer surface of the carrier to the recess, so that stormwater can pass through the apertures and reach the recess when the device is arranged in a floating condition inside the storm drain.
  • a major portion of the pollutants in stormwater is present at the surface of the stormwater inside the storm drain, also sometimes called the surface film.
  • a part of the bottom portion of the filter unit, when the device is arranged in a floating condition in a storm drain, is arranged at the surface by means of the floating carrier.
  • the apertures in the floating carrier result in that stormwater at said surface may engage the bottom portion of the filter unit to remove pollutants accumulated at the surface of the stormwater.
  • the structure of the device results in easy installation of the device and easy replacement of the filter unit.
  • the filter unit is detachable from the carrier, wherein the filter unit may be replaced and the carrier may be reused.
  • the top portion of the filter unit may be formed with an inclined surface, e.g. by the filter unit being tapered or cone shaped, for guiding non-filterable objects to the surface of the stormwater inside the storm drain.
  • non-filterable objects such as twigs, trash, sand and similar
  • fall through the storm drain it will then hit the inclined surface and continue along therewith to the surface of stormwater and then continue further to a catchbasin in the storm drain.
  • non-filterable objects are prevented from accumulating on top of the filter unit to impede its function.
  • the filter unit may comprise a plurality of different filter layers.
  • the filter unit may comprise one or more of an absorbing material, a heavy metal filtering peat and activated carbon.
  • the filter unit may comprise a first filter layer including a first absorbing material, a second filter layer including heavy metal filtering peat, a third filter layer including activated carbon and a fourth filter layer including a second absorbing material, which layers may be arranged in sequence or contiguous sequence.
  • the first filter unit may be arranged at the top and the fourth filter unit may be arranged at the bottom.
  • the fourth filter layer may be least partially arranged in the bottom portion of the filter unit.
  • the filter unit is arranged for efficient and reliable filtering of pollutants from stormwater.
  • the floating carrier may be made of a light-weight material for good floating capabilities.
  • the carrier may be made of expanded plastic, such as expanded polystyrene.
  • the device may be narrower than the storm drain in which it is intended to be arranged, thereby allowing formation of a gap between the device and an interior wall of the storm drain.
  • the device may comprise a sensor for monitoring the status of the device and the pollutants in the storm drain.
  • the device may comprise an RFID transponder having an ID-number and a pressure sensor for monitoring the depth of the device in the stormwater and thus the weight of the device, from which the amount of collected pollutants may be calculated. Also unexpected events resulting in sudden heavy pollution of a storm drain may be detected.
  • the invention also relates to a method of filtering stormwater in a storm drain, including the steps of
  • a filter unit having a bottom portion and a top portion
  • FIG. 1 is a schematic view of a device for filtering stormwater in accordance with one embodiment of the invention, wherein the device is installed in a storm drain,
  • FIG. 2 is a schematic section view the device in FIG. 1 , wherein a filter unit and a floating carrier of the device have been separated from each other, and
  • FIG. 3 is a schematic section view of the device according to one embodiment, wherein the device is partially immersed in stormwater.
  • FIG. 1 a device 10 for filtering stormwater according to one embodiment of the present invention is illustrated schematically.
  • the device 10 is arranged in a storm drain 11 having an inlet 12 for incoming storm water, an outlet 13 for discharging storm water, and a catch basin 14 for trapping objects, such as sediment, sand, gravel, pebbles, twigs, trash and similar.
  • the device 10 is arranged for filtering stormwater inside the storm drain 11 to remove pollutants from the storm water before discharge from the storm drain 11 .
  • the storm drain 11 according to FIG. 1 comprises an outlet pipe 15 forming a water trap in a conventional manner.
  • the storm drain 11 is arranged in a vertical direction and extends axially, wherein the outlet pipe 15 extends radially.
  • a portion of the outlet pipe 15 extends upwards, wherein the water seals the inlet 12 of the storm drain 11 from the outlet 13 .
  • the surface of the water inside the storm drain 11 is indicated by the dashed line A.
  • the storm drain 11 is arranged without a water trap.
  • the outlet 13 is connected to a subsequent drain system 16 , such as a sewer or similar.
  • the device 10 comprises a filter unit 17 and a floating carrier 18 for carrying the filter unit 17 .
  • the filter unit 17 is arranged for filtering the stormwater to remove pollutants therefrom.
  • the filter unit 17 is arranged on top of the carrier 18 , so that the filter unit 17 is arranged between the inlet 12 of the storm drain 11 and the carrier 18 .
  • the carrier 18 is arranged between the filter unit 17 and the catchbasin 14 or the bottom of the storm drain 11 .
  • the device 10 is arranged to form a gap 19 between the device 10 and an interior wall 20 of the storm drain 11 .
  • the gap 19 is arranged so that non-filterable objects, such as sediment, sand, gravel, pebbles, twigs, trash and similar can pass by the device 10 to the catchbasin 14 .
  • the device 10 is arranged to cover less than 100% of the cross section area of the storm drain.
  • the device 10 is arranged to cover 50-90% or 70-80% of the cross section area of the storm drain to form a suitable gap 19 .
  • the filter unit 17 is arranged is arranged to cover 50-90% or 70-80% of the cross section area of the storm drain.
  • the filter unit 17 comprises a bottom portion 21 and a top portion 22 .
  • the bottom portion 21 is arranged to engage the surface A of the stormwater inside the storm drain 11 to remove pollutants at the surface or in a surface film.
  • the bottom portion 21 is arranged to be at least partially submerged in the stormwater inside the storm drain 11 , i.e. at least a portion of the bottom portion 21 is arranged to be below the surface A of the stormwater inside the storm drain 11 .
  • the top portion 22 is arranged to be above the surface A.
  • the bottom portion 21 is bevelled and more narrow in its lowermost part.
  • the filter unit 17 comprises an inclined surface 23 for guiding non-filterable objects to the gap 19 .
  • the top portion 22 of the filter unit 17 comprises the inclined surface 23 for guiding non-filterable objects to the surface of the stormwater inside the storm drain.
  • the top portion 22 of the filter unit 17 is tapered, wherein an apex is arranged upwards in a direction towards the inlet 12 of the storm drain 11 and away from the carrier 18 , so that the inclined surface 23 extends between the apex and the widest portion of the device to guide objects along the inclined surface 23 to the gap 19 .
  • the filter unit 17 is arranged as a cone.
  • the bottom portion 21 of the filter unit 17 is arranged narrower than the widest portion of the top portion 22 thereof.
  • the filter unit 17 is arranged for filtering different types of pollutants from the stormwater.
  • the filter unit comprises a plurality of filter layers, such as a first filter layer 24 including a first absorbing material, a second filter layer 25 including heavy metal filtering peat, a third filter layer 26 including activated carbon and a fourth filter layer 27 including a second absorbing material.
  • the filter unit comprises additional filtering layers.
  • said filter layers 24 - 27 are arranged in sequence, such as contiguous sequence, from the top to the bottom, so that the first filter layer 24 is arranged in the top portion 22 of the filter unit 17 in a direction towards the inlet 12 of the storm drain 11 and so that the fourth filter layer 27 at least partially is arranged in the bottom portion 21 of the filter unit 17 in a direction towards the carrier 18 .
  • the first absorbing material of the first filter layer 24 comprises a material having capillaries, wherein the stormwater enters said capillaries by capillary force.
  • the absorbing material of the first filter layer 24 is arranged to absorb 10-20 or 18 times of its own weight.
  • the absorbing material of the first filter layer 24 is arranged so that the capillaries are closed when they are full.
  • the absorbing material of the first filter layer 24 is a synthetic fibre, such as a granular synthetic fibre.
  • the absorbing material of the first filter layer 24 complies with the requirements set out in table 1 below.
  • the second filtering layer 25 comprises, for example, a heavy metal filtering peat in the form of granules.
  • the second filtering layer 25 is arranged for removing heavy metals, such as lead, mercury, cadmium, etc., from the stormwater.
  • the third filter layer 26 is arranged to remove pollutants remaining in the stormwater after having passed the first and second filter 24 , 25 .
  • the activated carbon of the third layer 26 is formed as granules.
  • the activated carbon of the third layer 26 is formed as granules having a particle size of 1-10 mm, 2-7 mm or 3-5 mm.
  • the active carbon is a conventional active carbon for water treatment.
  • the fourth filter layer 27 is arranged for removing pollutants at the surface A of the stormwater inside the storm drain. Hence, the fourth filter layer 27 is arranged to be at the surface A, wherein a portion of the fourth filter layer 27 is submerged in the stormwater.
  • the fourth filter layer 27 comprises an absorbing material of a similar type as the first filter layer 24 , e.g. complying with the requirements set out in table 1 above.
  • the absorbing material of the fourth filter layer is a synthetic fibre felt or fleece.
  • the filter unit 17 comprises, for example, a cover forming a stormwater permeable housing.
  • the cover is a perforated plastic cover, wherein the perforations have a diameter of 0.1-5 mm, 0.5-2 mm or about 1 mm.
  • the cover is not disclosed in the drawings.
  • the carrier 18 is arranged for carrying the filter unit 17 , so that the top portion 22 of the filter unit 17 is arranged above the surface A of the stormwater inside the storm drain 11 and at least a part of the bottom portion 21 of the filter unit 17 is arranged below said surface A.
  • the carrier 18 is arranged in a floating material, i.e. a material having less density than water, such as an expanded plastic material.
  • the carrier 18 is formed in expanded polystyrene.
  • the carrier 18 comprises a recess 28 for receiving the bottom portion 21 of the filter unit 17 .
  • the recess 28 extends axially through the carrier 18 , so that the filter unit 17 can be arranged on top of the carrier 18 while the bottom portion 21 is arranged in the recess 28 .
  • the device 19 When arranged in a storm drain 11 the device 19 is floating, wherein the filter unit 17 is arranged to engage incoming stormwater, which is illustrated by means of the arrows B in FIG. 3 .
  • the top portion 22 of the filter unit 17 is primarily arranged to engage incoming stormwater B falling substantially in a vertical direction.
  • non-filterable objects are guided by the shape of the filter unit 17 to the gap 19 and the surface A of the stormwater in the gap 19 .
  • the filterable part of the stormwater is filtered by the filter unit 17 .
  • a main part of incoming stormwater B initially engages the first filter layer 24 , wherein stormwater passing the first filter layer 24 then engages the second filter layer 25 and subsequently the third and fourth filter layers 26 , 27 .
  • the recess 28 is optionally bevelled and wider in its top to guide the bottom portion 21 into the recess 28 and facilitate assembly of the device 10 .
  • the carrier 18 is provided with an optional flange 29 forming a wider top of the carrier 18 to support the filter unit 17 .
  • the carrier 18 comprises through apertures 30 for conducting stormwater into the recess 28 and into contact with the bottom portion 21 of the filter unit 17 for removal of pollutants in the stormwater at the surface A.
  • the apertures 30 extend radially from an outer surface of the carrier 18 to the recess 28 .
  • the fourth filter layer 27 is arranged in the recess 28 and below the surface A. Consequently, stormwater at the surface A is conducted radially through the apertures 30 , which is illustrated by the arrows C.
  • the radially conducted stormwater C is conducted into the recess 28 and into contact with the filter unit 17 for removing pollutants in the stormwater.
  • the stormwater C is conducted to the fourth filter layer 27 in the bottom portion 21 of the filter unit 17 , so that pollutants on the surface A or close to the surface A engages the filter unit 17 and are removed by it.
  • the device 10 comprises a sensor 31 for detecting the filter capacity of the filter unit 17 .
  • the sensor 31 is a pressure sensitive sensor for detecting the surrounding pressure.
  • the sensor 31 is arranged below the surface A of the stormwater inside the storm drain 11 .
  • Said pressure is readily calculated to obtain the depth of the device 10 in the stormwater, wherein a change in the depth of the device 10 can be calculated.
  • Said depth corresponds to the weight of the device 10 , wherein the added weight, i.e. the weight of filtered material in the filter unit 17 , is calculated.
  • Said weight is compared to the total weight capacity of the filter unit 17 , wherein the remaining filter capacity is calculated.
  • the sensor 31 is, for example, connected to a central monitoring unit for monitoring a plurality of devices 10 arranged in different storm drains 11 .
  • the sensor 31 is included in an RFID transponder having an ID-number and the pressure sensor to detect the weight of the device and send a signal to the central monitoring unit when a predetermined weight has been exceeded or a sudden weight change has been detected.
  • a predetermined weight of the device 10 When a predetermined weight of the device 10 has been exceeded it can indicate that the filter unit 17 is full and needs to be replaced.
  • the detection of a sudden weight change can indicate a substantial and local discharge of pollutants, which can be related to an event, such as a traffic accident or any other event.

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  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Water Treatment By Sorption (AREA)
  • Sewage (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Testing Or Calibration Of Command Recording Devices (AREA)
  • Filtering Materials (AREA)
  • Respiratory Apparatuses And Protective Means (AREA)
  • Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
US13/748,283 2012-01-30 2013-01-23 Device and a method for filtering stormwater Abandoned US20130233806A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP12153111.5A EP2620561B1 (fr) 2012-01-30 2012-01-30 Dispositif et procédé de filtrage des eaux de ruissellement
EP12153111.5 2012-01-30

Publications (1)

Publication Number Publication Date
US20130233806A1 true US20130233806A1 (en) 2013-09-12

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Family Applications (2)

Application Number Title Priority Date Filing Date
US13/748,283 Abandoned US20130233806A1 (en) 2012-01-30 2013-01-23 Device and a method for filtering stormwater
US14/375,102 Abandoned US20150001162A1 (en) 2012-01-30 2013-01-28 System, method and use for monitoring an environmental condition in a storm drain

Family Applications After (1)

Application Number Title Priority Date Filing Date
US14/375,102 Abandoned US20150001162A1 (en) 2012-01-30 2013-01-28 System, method and use for monitoring an environmental condition in a storm drain

Country Status (11)

Country Link
US (2) US20130233806A1 (fr)
EP (2) EP2620561B1 (fr)
JP (2) JP6073927B2 (fr)
CN (2) CN104220680B (fr)
CA (2) CA2862321C (fr)
DK (1) DK2620561T3 (fr)
ES (1) ES2534002T3 (fr)
PL (1) PL2620561T3 (fr)
PT (1) PT2620561E (fr)
SG (2) SG11201404442XA (fr)
WO (2) WO2013113449A1 (fr)

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US20210339175A1 (en) * 2017-11-17 2021-11-04 Hemp-Shire LLC Activated hemp filters and method of making activated hemp filters

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CN104390143A (zh) * 2014-09-23 2015-03-04 成都众山科技有限公司 便于减少耗能的城市排水系统地沟终端
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CN104857815B (zh) * 2015-04-24 2018-03-02 华南师范大学 一种适用于下水道有害气体原位控制的装置及其吸附剂制备方法
CN105926732A (zh) * 2016-05-09 2016-09-07 无锡昊瑜节能环保设备有限公司 一种自动感应式下水管道过滤器
US20180291610A1 (en) * 2017-04-07 2018-10-11 John Henry System and Method for Identifying and Inspecting a Drain
CN107103412B (zh) * 2017-04-11 2020-08-21 山东大学 一种河流水资源资产负债系统及其计算方法
US20190249406A1 (en) * 2018-02-15 2019-08-15 Environmental Quality Resources, Inc. Remote stormwater management pond volume adjustment system
DE102018128443A1 (de) 2018-11-13 2020-05-14 ACO Severin Ahlmann GmbH & Co Kommanditgesellschaft Entwässerungssystem und Rigole
CN110533890B (zh) * 2019-09-11 2021-06-04 苏州千层茧农业科技有限公司 简易下水道堵塞应急预警发布系统
DE102019128785A1 (de) * 2019-10-24 2021-04-29 Rehau Ag + Co Verfahren zur Voraussage eines Betriebszustands eines Fluidmanagementsystems
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CN111074991B (zh) * 2019-12-07 2020-12-18 卢佳毅 一种带有植被种植层的市政排水沟
SE2250052A1 (en) * 2022-01-21 2023-02-28 Acitex Miljoeskydd Ab A storm drain filter for adsorbing oil, petroleum based liquids and micro plastics, a storm drain filter locking unit, and a method for assembling such a storm drain filter
CN114808169B (zh) * 2022-04-28 2023-03-31 江苏国望高科纤维有限公司 一种平砂器
KR102489751B1 (ko) * 2022-05-03 2023-01-18 박진석 무동력 빗물 여과 장치

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US20210339175A1 (en) * 2017-11-17 2021-11-04 Hemp-Shire LLC Activated hemp filters and method of making activated hemp filters
US11833460B2 (en) * 2017-11-17 2023-12-05 Hemp-Shire, LLD Activated hemp filters and method of making activated hemp filters
US11043103B1 (en) 2020-09-02 2021-06-22 Zurn Industries, Llc Connected roof drain

Also Published As

Publication number Publication date
WO2013113449A1 (fr) 2013-08-08
JP2015504993A (ja) 2015-02-16
PT2620561E (pt) 2015-02-13
CA2862321A1 (fr) 2013-08-08
ES2534002T3 (es) 2015-04-16
EP2620562A1 (fr) 2013-07-31
CN104220680A (zh) 2014-12-17
CN104220680B (zh) 2016-08-24
CN104204371A (zh) 2014-12-10
DK2620561T3 (en) 2015-02-16
CN104204371B (zh) 2017-08-25
US20150001162A1 (en) 2015-01-01
CA2862321C (fr) 2020-04-14
JP6073927B2 (ja) 2017-02-01
PL2620561T3 (pl) 2015-05-29
JP2015510056A (ja) 2015-04-02
SG11201404441UA (en) 2014-09-26
SG11201404442XA (en) 2014-10-30
CA2863948A1 (fr) 2013-08-08
EP2620561A1 (fr) 2013-07-31
WO2013113648A1 (fr) 2013-08-08
EP2620561B1 (fr) 2014-12-31

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