WO2015065286A1 - Floating filter system for in- situ algae removal - Google Patents
Floating filter system for in- situ algae removal Download PDFInfo
- Publication number
- WO2015065286A1 WO2015065286A1 PCT/SG2013/000505 SG2013000505W WO2015065286A1 WO 2015065286 A1 WO2015065286 A1 WO 2015065286A1 SG 2013000505 W SG2013000505 W SG 2013000505W WO 2015065286 A1 WO2015065286 A1 WO 2015065286A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- filter system
- floating
- filter
- algae
- floating filter
- Prior art date
Links
- 241000195493 Cryptophyta Species 0.000 title claims abstract description 48
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 41
- 239000012141 concentrate Substances 0.000 claims abstract description 10
- 238000000034 method Methods 0.000 claims description 19
- 238000005086 pumping Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 2
- 230000005484 gravity Effects 0.000 claims description 2
- 238000003780 insertion Methods 0.000 claims description 2
- 230000037431 insertion Effects 0.000 claims description 2
- 239000000463 material Substances 0.000 claims description 2
- 230000004907 flux Effects 0.000 claims 1
- 239000012528 membrane Substances 0.000 claims 1
- 239000012466 permeate Substances 0.000 claims 1
- 239000012465 retentate Substances 0.000 claims 1
- 235000015097 nutrients Nutrition 0.000 description 3
- 230000000717 retained effect Effects 0.000 description 3
- 238000001914 filtration Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 241000192700 Cyanobacteria Species 0.000 description 1
- 206010021143 Hypoxia Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 238000005189 flocculation Methods 0.000 description 1
- 230000016615 flocculation Effects 0.000 description 1
- 238000003306 harvesting Methods 0.000 description 1
- 230000001146 hypoxic effect Effects 0.000 description 1
- 239000008239 natural water Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
- B01D35/05—Floating filters
Definitions
- This invention relates to a floating filter system, inter alia*, a crossflow filter system and its application for the removal of algae in open lakes or ponds.
- Algae are of vital importance in the formation and maintaining of present atmosphere. They are also of vital importance in supplying food to living things. However, they may also be harmful when bloom and cause water body hypoxic.
- the root cause of algae bloom is the excess nutrients in the water body. Living algae are actually cleaners of the nutrients, but when they die and decay, they return the nutrients back to the water body. In most of the cases, algae bloom once started will last until the weather cools. To remove the excess algae from the water body directly may be one of the most direct and quickest measures to tackle the harmful algae bloom.
- One objective of our invention is to provide a filter system and method capable but not limited to concentrate algae in- situ a water body without pumping vast volume of the water to be treated;
- Another objective of our invention is to provide a device and method capable but not limited to collect and remove algae
- Another objective of this invention is to provide an application method of crossflow filter to tackle the fouling problem by organisms like algae;
- Another objective of this invention is to provide a device and method to remove most of the dilute algae in large water bodies
- Another objective of this invention is to provide a device and method to Harvest high purity fresh algae in large lakes by separating coarser contaminants from algae simultaneously;
- Yet another objective of this invention is to provide a device and' method to disturb least other living creatures and their living environment when removing most of the algae from the water bodies;
- Still another objective of this invention is to provide a high efficiency and low energy consuming device and method to remove most of the dilute algae in large water bodies;
- Still another objective of this invention is to provide a device and method to concentrate and remove most of the algae in large water bodies without addition of any chemicals;
- Yet another objective of this invention is to provide a device and method that is also capable to remove most of the algae when diverting the algae from entering a protected water body.
- a floating filter system comprising a chain of floats (1) , a filter medium (2) hanged on said floats along its upper edge, a collection slot (3) disposed in the middle of said chain of floats and filter medium and sealed to them with its front edges, a chain of rigid bars (4) hanging alone the lower edge of said filter medium (2) , bands (5) equipped at each joint point of said floats (1) and said bars (4), buoy ⁇ (7) with a hook ring hanging below water surface, and towirig ropes (6) connecting said bands and said ring under said buoy (7) , forming a funnel plan view.
- said floats are polymer made long airbags, being able to stretch and stand straight when pumped with air.
- said filter medium (2) has a smooth surface, being strong, less elastic and not biodegradable, permissive to water but retentive to most of algae colonies.
- the filter medium is lined on its backside with durable cloth or net material to form soft tubes, along its upper edge and lower edge suitable for insertion of said floats and weight bars.
- said collection slot (3) is made of fibre-reinforced-product and is equipped with electric scrapers.
- said ropes (6) have their overall specific gravity equal or very close to 1. '
- a floating filter system assembly with the addition of a coarser floating filter system in front of the first embodiment.
- the front filter medium (8) is of bigger mesh that permits algae and water to pass freely, but rejects most of the coarser floating debris.
- the front and rear floating filters are linked with towing ropes (6) tied at the bands (5) to form illustrated plan view in Fig 2.
- the number and length of floats on both sides of the collection slot are not equal.
- the floats (1) are properly sized and the hanging bars (4) are properly weighted in all embodiments hence the filter medium (2) and (8) is under enough tension to be flat or near flat in the water all the
- two airbags (9) and (10) are attached to said collection slot (3) underneath in the front and rear respectively, enable user to adjust the draft of the mouth and the tail of the collection slot through pumping in or release the air in the airbags .
- said collection slot is equipped with a scraper (11) enable to load the algae slurry concentrated at the mouth of the collection slot to a collection bag or boat attached to tail.
- Fig 1 is a conceptual plan view of the general embodiment of a floating filter system.
- Fig 2 is a schematic plan view of. a floating filter system assembly.
- Fig 3 is a schematic side view of the collection slot.
- Fig 4 is a schematic section view of the first embodiment of the- invention.
- Fig 5 is a schematic section view of the second embodiment of the invention.
- Fig 6 is a schematic plan view of the third embodiment of the invention.
- the filter medium surface is facing up and center forward.
- the filter assembly moves forward, most of the water will pass the filter medium while most of the algae colonies will be retained and form algae concentrate in front of the filter medium surface.
- the retained algae Concentrate will form a crossflow along the filter medium surface and flow towards the collection slot (3) at the bottom of the filter funnel.
- the upper forward ⁇ inclination of the filter medium surface (2) is greater than centre forward inclination, which helps to prevent or reduce the algae concentrate from escaping around the lower edge of the, filter medium.
- the floating filter system can be as long as a hundred meters if the water body condition allows, while only less than a meter deep.
- the floating filter system moves forward slowly so that the pressure differential across the filter medium is small to minimize the fouling of filter medium by algae and the like.
- the visible floating debris will be caught by the front filter medium (8) , while water and algae will pass freely and reach the rear filter medium (2) .
- Most of the algae will be retained and form algae concentrate and crossflow towards the collection slot (3) .
- harvested algae are purer and more valuable for further beneficial process.
- the floating filter system is anchored with its two ends of to the bank if possible or through said buoy (7) across a water course forming an angle with the wind or water flow direction.
- the filter medium surface shall always incline up-forward towards upstream or the moving direction of algae.
- the collection slot if not in the centre of the filter system shall be located at the downstream wing of the system.
- the floating filter system of this invention not only prevents or reduces the algae from entering the downstream or leeward water area, but also enables easy removal of accumulated algae from the water body by collecting concentrated algae slurry at the collection slot .
- the concentration of the algae concentrate is a joint result of the filter medium facing angle against the water flow direction, the moving speed, the wind direction and speed, the draft of the collection slot, etc. It is always preferred to tow the floating filter system windward.
Landscapes
- Engineering & Computer Science (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Cleaning Or Clearing Of The Surface Of Open Water (AREA)
Abstract
A floating filter system illustrated in Fig 1 comprising, as its major components, floats (1), filter medium (2), weight bars (4) and collection slot (3), funnel disposed when towed in a water body, functioning as a crossflow filter that enables to concentrate and remove algae in- situ an open and large water body efficiently.
Description
Floating Filter System for In- situ Algae Removal
TECHNICAL FIELD
This invention relates to a floating filter system, inter alia*, a crossflow filter system and its application for the removal of algae in open lakes or ponds.
BACKGROUND ART
Algae are of vital importance in the formation and maintaining of present atmosphere. They are also of vital importance in supplying food to living things. However, they may also be harmful when bloom and cause water body hypoxic. The root cause of algae bloom is the excess nutrients in the water body. Living algae are actually cleaners of the nutrients, but when they die and decay, they return the nutrients back to the water body. In most of the cases, algae bloom once started will last until the weather cools. To remove the excess algae from the water body directly may be one of the most direct and quickest measures to tackle the harmful algae bloom.
Existing art of removing algae in practice as happening in Taihu Lake in Wuxi andDianchi Lake in Kunming, China is to suck the surface 50mm algae-containing water and treat the water by flocculation and then sedimentation/filtration. It is only carried out in leeward or downstream bays or shores where severe algae scum has formed.
There is other technique to separate algae from water. Direct filtration, for instance, is disclosed by Dodd in 1981 in USP No. 4255261 and by Willuweit in 2013 in USP No. 8496120.
The premise of the application of above arts is that all the influent to be treated must be fed to the devices. Algae are tiny cyanobacteria and very dilute in natural water bodies in terms of weight even when they bloom. It is hardly affordable to pump only the surface 50mm water of a lake.
SUMMARY OF DISCLOSURE
One objective of our invention is to provide a filter system and method capable but not limited to concentrate algae in- situ a water body without pumping vast volume of the water to be treated;
Another objective of our invention is to provide a device and method capable but not limited to collect and remove algae;
Another objective of this invention is to provide an application method of crossflow filter to tackle the fouling problem by organisms like algae;
Another objective of this invention is to provide a device and method to remove most of the dilute algae in large water bodies;
Another objective of this invention is to provide a device and method
to Harvest high purity fresh algae in large lakes by separating coarser contaminants from algae simultaneously;
Yet another objective of this invention is to provide a device and' method to disturb least other living creatures and their living environment when removing most of the algae from the water bodies;
Still another objective of this invention is to provide a high efficiency and low energy consuming device and method to remove most of the dilute algae in large water bodies;
Still another objective of this invention is to provide a device and method to concentrate and remove most of the algae in large water bodies without addition of any chemicals;
Yet another objective of this invention is to provide a device and method that is also capable to remove most of the algae when diverting the algae from entering a protected water body.
In the first preferred embodiment of our invention as illustrated in Fig 1, it is provided a floating filter system comprising a chain of floats (1) , a filter medium (2) hanged on said floats along its upper edge, a collection slot (3) disposed in the middle of said chain of floats and filter medium and sealed to them with its front edges, a chain of rigid bars (4) hanging alone the lower edge of said filter medium (2) , bands (5) equipped at each joint point of said floats (1) and said bars (4), buoy~(7) with a hook ring hanging below water surface, and towirig ropes (6) connecting said bands
and said ring under said buoy (7) , forming a funnel plan view. Preferably said floats are polymer made long airbags, being able to stretch and stand straight when pumped with air. Preferably said filter medium (2) has a smooth surface, being strong, less elastic and not biodegradable, permissive to water but retentive to most of algae colonies. Preferably the filter medium is lined on its backside with durable cloth or net material to form soft tubes, along its upper edge and lower edge suitable for insertion of said floats and weight bars. Preferably said collection slot (3) is made of fibre-reinforced-product and is equipped with electric scrapers. Preferably said ropes (6) have their overall specific gravity equal or very close to 1. '
In the second preferred embodiment of out invention as illustrated in Fig 2, it is provided a floating filter system assembly with the addition of a coarser floating filter system in front of the first embodiment. Preferably the front filter medium (8) is of bigger mesh that permits algae and water to pass freely, but rejects most of the coarser floating debris. The front and rear floating filters are linked with towing ropes (6) tied at the bands (5) to form illustrated plan view in Fig 2.
In the third preferred embodiment of out invention as illustrated in Fig 6 derived from the first embodiment, the number and length of floats on both sides of the collection slot are not equal.
Preferably the floats (1) are properly sized and the hanging bars (4) are properly weighted in all embodiments hence the filter medium (2) and (8) is under enough tension to be flat or near flat in the
water all the
Preferably two airbags (9) and (10) are attached to said collection slot (3) underneath in the front and rear respectively, enable user to adjust the draft of the mouth and the tail of the collection slot through pumping in or release the air in the airbags . Preferably said collection slot is equipped with a scraper (11) enable to load the algae slurry concentrated at the mouth of the collection slot to a collection bag or boat attached to tail.
BRIEF DESCRIPTION OF THE DRAWINGS
The present invention will be better understood with reference to the accompanying drawings or figures, and the detailed description that follows hereinafter wherein specific embodiments are described as non-limiting examples or illustrations, in which;
Fig 1 is a conceptual plan view of the general embodiment of a floating filter system.
Fig 2 is a schematic plan view of. a floating filter system assembly.
Fig 3 is a schematic side view of the collection slot.
Fig 4 is a schematic section view of the first embodiment of the- invention.
Fig 5 is a schematic section view of the second embodiment of the invention.
Fig 6 is a schematic plan view of the third embodiment of the invention.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS
In the first preferred embodiment of our invention as illustrated in Fig 1 and Fig 4, when the floating filter system is towed and the ropes (6) are in tension, the filter medium surface is facing up and center forward. When the filter assembly moves forward, most of the water will pass the filter medium while most of the algae colonies will be retained and form algae concentrate in front of the filter medium surface. As there is an angle between the moving direction and filter medium facing direction, the retained algae Concentrate will form a crossflow along the filter medium surface and flow towards the collection slot (3) at the bottom of the filter funnel. Preferably the upper forward■ inclination of the filter medium surface (2) is greater than centre forward inclination, which helps to prevent or reduce the algae concentrate from escaping around the lower edge of the, filter medium. Typically the floating filter system can be as long as a hundred meters if the water body condition allows, while only less than a meter deep. Typically the floating filter system moves forward slowly so that the pressure differential across the filter medium is small to minimize the fouling of filter medium by algae and the like.
In the second preferred embodiment of the invention illustrated in Fig 2 and Fig 5 , when the floating filter assembly is towed forward in the open water, the visible floating debris will be caught by the front filter medium (8) , while water and algae will pass freely and reach the rear filter medium (2) . Most of the algae will be retained and form algae concentrate and crossflow towards the collection slot (3) . Thus harvested algae are purer and more valuable for further beneficial process.
In the third preferred embodiment of the invention as illustrated in Fig 6, the floating filter system is anchored with its two ends of to the bank if possible or through said buoy (7) across a water course forming an angle with the wind or water flow direction. The filter medium surface shall always incline up-forward towards upstream or the moving direction of algae. The collection slot if not in the centre of the filter system shall be located at the downstream wing of the system. Compared to common oil boom, the floating filter system of this invention not only prevents or reduces the algae from entering the downstream or leeward water area, but also enables easy removal of accumulated algae from the water body by collecting concentrated algae slurry at the collection slot .
In all above preferred embodiments, the concentration of the algae concentrate is a joint result of the filter medium facing angle against the water flow direction, the moving speed, the wind direction and speed, the draft of the collection slot, etc. It is always preferred to tow the floating filter system windward.
Claims
1. A floating filter system comprising Two chains of floats; -■ A chain of weight bars; A strip of filter medium; A collection slot;
A buoy with a ring hanging below water surface .
2. A floating filter system according to claim 1 wherein said filter medium is lined with two strips of cloth or net material on the back side along the upper and lower edges to form soft tubes allowing insertion of said chains of floats and weight bars therein respectively.
3. A floating filter system according to claim 1 wherein said filter medium is single thin sheet of smooth surface, permeable to water but rejects most of algae colonies and coarser matters.
4. A floating filter system according to claim 1 and 2 wherein said filter medium is a net totally permeable to water and algae colonies but rejects coarser debris, and said weight bars are replaced with cord.
5 . A floating filter system according to claim 1 wherein said filter medium is consistently under even tension across the whole length
as the result of the buoyancy from the floats and the gravity of the weight bars when it is floating freely in water body.
6. A floating filter system according to claim 1 whereon rings '-or ' bands are fixed at each joint point of floats on the front side and of weight bars.
7. A floating filter system according to claim 1 wherein said collection slot is attached with two airbags underneath its bottom in front and rear respectively.
8. A floating filter system according to claim 1 wherein said collection slot is fixed with a scrapper above its inner bottom.
9. A floating filter system according to claim 1 wherein said filter medium has a shallow opening between two chains of floats, wherewith the front edge of said collection slot according to claim 1, 7 or 8 is fixed and sealed.
10. A floating filter system according to claims 1, 5 and 9 whereof an application method is to connect said rings under said buoy and bands according to claim 6 with ropes that when said buoy - is towed forward, said filter medium according to claim 2 and 3 is facing up and centre forward, and the filter system forms a filter funnel in the plan view whereof said collection slot is the bottom.
11. A floating filter system according to claim 1 and 10 whereof
an application method is as a cr ssflow filter where the retentate forms a concentrate flux towards said collection slot when the system moves forward in a water body.
12. A floating filter system according to claim 1 , 10 and 11 whereof the application method is moving in-situ a water body without pumping of feed water or permeate as a means of establishing cross-membrane pressure differential.
13. A floating filter system assembly wherein the said floating, filter system according to claim 4 and 5 is disposed in the front of and linked with said filter system according to claim 3, 5 and 9 with parallel ropes tied to corresponding said bands according to claim 6 that when the assembly is towed forward, said filter medium according to claim 2 and 3 is facing up and centre forward, and the rear filter system forms a filter funnel in the plan view whereof said collection slot is the bottom.
14. A floating filter system assembly according to claim 13 whereof an application method is a combination of the front dead-end filter according to claim 4 and the rear crossflow filter according to claim 11 when moves forward in a water body, and whereby most of the coarser floating debris is separated from algae concentrate .
15. A floating filter system and application method according to claim 10 whereof a derived application method is to anchor said buoy to the upper stream or windward, or directly tie the bundle
of ropes that connected to said bands according to claim 6 to the bank of a water course or water area to be protected whereby algae are not only blocked but also1 collected and removed thereafter.
16. A floating filter system and application method according to claim 11 whereof a derived application method is to anchor a series of said buoys and floating filter systems around a water area whereby algae are not only blocked but also collected in the collection slot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201380080960.7A CN105764588B (en) | 2013-10-31 | 2013-11-27 | The floating filter system of blue-green algae is directly filtered out in water body |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SG201308091-6 | 2013-10-31 | ||
| SG2013080916A SG2013080916A (en) | 2013-10-31 | 2013-10-31 | Floating filter system for in-situ algae removal |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2015065286A1 true WO2015065286A1 (en) | 2015-05-07 |
Family
ID=53004723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/SG2013/000505 WO2015065286A1 (en) | 2013-10-31 | 2013-11-27 | Floating filter system for in- situ algae removal |
Country Status (3)
| Country | Link |
|---|---|
| CN (1) | CN105764588B (en) |
| SG (1) | SG2013080916A (en) |
| WO (1) | WO2015065286A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111296373A (en) * | 2020-02-21 | 2020-06-19 | 琼台师范学院 | Collector for plankton |
| CN116747591A (en) * | 2023-08-22 | 2023-09-15 | 山西林海腐植酸科技有限公司 | Humic acid production filter equipment |
| CN116973312A (en) * | 2023-09-25 | 2023-10-31 | 湖北金浪勘察设计有限公司 | River ecology monitoring device |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107012847A (en) * | 2017-04-27 | 2017-08-04 | 昆明理工大学 | A kind of algae processing unit and method |
| CN111450617B (en) * | 2020-04-14 | 2021-10-19 | 李振涛 | Filter equipment for river sewage treatment |
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| JPH07251188A (en) * | 1994-03-16 | 1995-10-03 | Pub Works Res Inst Ministry Of Constr | Pumice filter |
| DE10043595A1 (en) * | 2000-09-01 | 2002-03-28 | Thomas Willuweit | Floating pond water filter housing has chamber with nutrients for micro-organisms residing on a substrate surface |
| WO2003024565A1 (en) * | 2001-09-19 | 2003-03-27 | Brueggert Detlef | Component for a pond filtering system |
| DE202010006734U1 (en) * | 2010-05-12 | 2010-08-19 | Söll Gmbh | Filter unit, filter device and filter system |
| US8496120B2 (en) * | 2008-04-18 | 2013-07-30 | IFE Innovative Forschungs-und Entwicklungs GmbH & Co. KG | Filter network |
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| CN201161948Y (en) * | 2008-02-22 | 2008-12-10 | 合肥市东方美捷分子材料技术有限公司 | Coagulate algae purification platform |
| CN201694364U (en) * | 2008-08-08 | 2011-01-05 | 青岛市城阳区海洋与渔业局 | Dual-wing attack tucking boat net |
| CN201339180Y (en) * | 2009-01-05 | 2009-11-04 | 张凌玲 | Blue algae collecting and fishing device |
| CN201390368Y (en) * | 2009-03-26 | 2010-01-27 | 河海大学 | Novel multifunctional cyanobacteria fishing boat |
| CN101671060A (en) * | 2009-09-24 | 2010-03-17 | 同济大学 | Processing device of single air floatation alga removing ship for large-area alga eruption of natural water body and processing method |
| CN102464092A (en) * | 2010-11-09 | 2012-05-23 | 海安县商业学校 | Lake surface cleaning boat |
| CN203096703U (en) * | 2013-02-17 | 2013-07-31 | 上海城投原水有限公司青草沙水库管理分公司 | Water source area lake and reservoir alga filter net |
| CN103422480B (en) * | 2013-08-20 | 2017-07-07 | 复旦大学 | A kind of method and apparatus of big waters blue-green algae water conservancy diversion enrichment |
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2013
- 2013-10-31 SG SG2013080916A patent/SG2013080916A/en unknown
- 2013-11-27 WO PCT/SG2013/000505 patent/WO2015065286A1/en active Application Filing
- 2013-11-27 CN CN201380080960.7A patent/CN105764588B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH07251188A (en) * | 1994-03-16 | 1995-10-03 | Pub Works Res Inst Ministry Of Constr | Pumice filter |
| DE10043595A1 (en) * | 2000-09-01 | 2002-03-28 | Thomas Willuweit | Floating pond water filter housing has chamber with nutrients for micro-organisms residing on a substrate surface |
| WO2003024565A1 (en) * | 2001-09-19 | 2003-03-27 | Brueggert Detlef | Component for a pond filtering system |
| US8496120B2 (en) * | 2008-04-18 | 2013-07-30 | IFE Innovative Forschungs-und Entwicklungs GmbH & Co. KG | Filter network |
| DE202010006734U1 (en) * | 2010-05-12 | 2010-08-19 | Söll Gmbh | Filter unit, filter device and filter system |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111296373A (en) * | 2020-02-21 | 2020-06-19 | 琼台师范学院 | Collector for plankton |
| CN116747591A (en) * | 2023-08-22 | 2023-09-15 | 山西林海腐植酸科技有限公司 | Humic acid production filter equipment |
| CN116747591B (en) * | 2023-08-22 | 2023-10-24 | 山西林海腐植酸科技有限公司 | Humic acid production filter equipment |
| CN116973312A (en) * | 2023-09-25 | 2023-10-31 | 湖北金浪勘察设计有限公司 | River ecology monitoring device |
| CN116973312B (en) * | 2023-09-25 | 2023-12-12 | 湖北金浪勘察设计有限公司 | River ecology monitoring device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN105764588B (en) | 2017-07-28 |
| CN105764588A (en) | 2016-07-13 |
| SG2013080916A (en) | 2015-05-28 |
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