LU500116B1 - Oxidation ditch type microporous aeration aquaculture pond bottom water treatment system and construction method - Google Patents
Oxidation ditch type microporous aeration aquaculture pond bottom water treatment system and construction method Download PDFInfo
- Publication number
- LU500116B1 LU500116B1 LU500116A LU500116A LU500116B1 LU 500116 B1 LU500116 B1 LU 500116B1 LU 500116 A LU500116 A LU 500116A LU 500116 A LU500116 A LU 500116A LU 500116 B1 LU500116 B1 LU 500116B1
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- LU
- Luxembourg
- Prior art keywords
- pond
- ditch
- segment
- oxidation ditch
- water
- Prior art date
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 108
- 238000005273 aeration Methods 0.000 title claims abstract description 60
- 230000003647 oxidation Effects 0.000 title claims abstract description 55
- 238000007254 oxidation reaction Methods 0.000 title claims abstract description 55
- 238000009360 aquaculture Methods 0.000 title claims abstract description 37
- 244000144974 aquaculture Species 0.000 title claims abstract description 37
- 238000010276 construction Methods 0.000 title claims description 7
- 239000000945 filler Substances 0.000 claims abstract description 33
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 238000006213 oxygenation reaction Methods 0.000 claims description 7
- 238000000034 method Methods 0.000 claims description 6
- 238000005276 aerator Methods 0.000 description 13
- 230000000694 effects Effects 0.000 description 6
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009395 breeding Methods 0.000 description 1
- 230000001488 breeding effect Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 201000010099 disease Diseases 0.000 description 1
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
- A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
- A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
- A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
- A01K63/042—Introducing gases into the water, e.g. aerators, air pumps
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/02—Aerobic processes
- C02F3/12—Activated sludge processes
- C02F3/1236—Particular type of activated sludge installations
- C02F3/1257—Oxidation ditches
-
- 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
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Environmental Sciences (AREA)
- Marine Sciences & Fisheries (AREA)
- Animal Husbandry (AREA)
- Biodiversity & Conservation Biology (AREA)
- Farming Of Fish And Shellfish (AREA)
Abstract
The invention relates to an oxidation ditch type microporous aeration aquaculture pond bottom water treatment system. Suction pipes are provided with a plurality of suction holes, the plurality of suction pipes are arranged at intervals close to the bottom of a pond and communicated with a suction main pipe, an axial flow pump is arranged on the suction main pipe, a tail end of the suction main pipe extends out of one side of the pond and is communicated with a water inlet ditch, a tail end of the water inlet ditch is communicated with an upper part of one side of a filler filter tank, a bottom of the other side of the filler filter tank is provided with a first weir, the first weir is communicated with one side of a mid-segment oxidation ditch, aeration pipes are arranged at the bottom of the mid-segment oxidation ditch, the aeration pipes are connected to a Roots blower, an upper part of the other side of the mid-segment oxidation ditch is communicated with a rear-segment drainage ditch, and a tail end of the rear-segment drainage ditch is communicated with the pond via a second weir at an upper part of the other side of the pond. The exchange of top and bottom water of the pond is completed, the flow of water in the pond from one side to the other side is propelled, and the dissolved oxygen content of the whole water in the pond is increased through the mid-segment oxidation ditch.
Description
OXIDATION DITCH TYPE MICROPOROUS AERATION AQUACULTURE POND LU500116
[0001] 1. Technical Field
[0002] The invention relates to an aquaculture pond bottom water treatment system, in particular to an oxidation ditch type microporous aeration aquaculture pond bottom water treatment system and a construction method, belonging to the technical field of aquaculture water treatment.
[0003] 2. Description of Related Art
[0004] Improving the dissolved oxygen content of aquaculture water by aeration equipment is universally used in pond culture. At present, the pond water aeration equipment mainly includes paddle aerators, waterwheel aerators and microporous aerators, which have different structures and principles and therefore have different application ranges and aeration effects on ponds; however, they all have ideal aeration effect on bottom water containing nearly 0 mg/L of oxygen in not more than 1 m deep ponds.
[0005] Fish excrement and residual feeds in pond culture are freely settled at the bottom of the pond, causing deterioration of breeding environment and serious sedimentary pollution. Water depths of existing aquaculture ponds are 1.5 to 2.0 m, and the widely used aeration method at present is to place an aeration equipment such as a paddle aerator, a waterwheel aerator, an automatic aerator or the like to the water surface or bottom of a pond; the paddle aerator achieves partial aeration, and has the function of improving the content of dissolved oxygen only for water around the equipment within a certain range; the waterwheel aerator aerates top water, and does not have the aeration effect on the water less than 1 m; the automatic aerator aerates the bottom, and is only effective for the water around an aeration pipeline due to the arrangement of the aeration pipeline, and its aeration effect on the bottom water is not obvious. The results of pond | ;500116 application test show that the above aeration methods are not ideal for the aeration effect on bottom water of the pond.
[0006] Moreover, in order to implement top and bottom water exchange for aquaculture ponds in the prior art, additional water exchange equipment is required, and this function cannot be achieved by aeration.
[0007] The microporous aerators have stronger capabilities than the paddle aerators and waterwheel aerators. Microporous aeration has been widely studied in the field of environment-friendly urban sewage treatment, but it is difficult to achieve in the field of aquaculture. How to adaptively design microporous aerators to play a role in the field of aquaculture ponds is a technical problem urgently to be solved in the art.
[0008] The objective of the invention is to provide an oxidation ditch type microporous aeration aquaculture pond bottom water treatment system and process, which greatly improve the aeration effect and uniformity of all water in an aquaculture pond and realize the exchange of top and bottom water.
[0009] The invention adopts the following technical solution:
[0010] An oxidation ditch type microporous aeration aquaculture pond bottom water treatment system includes an axial flow pump 1, suction pipes 8, a suction main pipe 7, a front-segment water inlet ditch 2, a filler filter tank 3, a mid-segment oxidation ditch 9, and a rear-segment drainage ditch 12; the suction pipes 8 are provided with a plurality of suction holes, the plurality of suction pipes 8 are arranged at intervals close to the bottom of a pond and communicated with the suction main pipe 7, the axial flow pump 1 is arranged on the suction main pipe 7, a tail end of the suction main pipe 7 extends out of one side of the pond and is communicated with the water inlet ditch 2, a tail end of the water inlet ditch 2 is communicated with an upper part of one side of the filler filter tank 3, | 590116 a bottom of the other side of the filler filter tank 3 is provided with a first weir 16, the first weir 16 is communicated with one side of the mid-segment oxidation ditch 9, aeration pipes 11 are arranged at the bottom of the mid-segment oxidation ditch 9, the aeration pipes 11 are connected to a Roots blower 10, an upper part of the other side of the mid-segment oxidation ditch 9 is communicated with the rear-segment drainage ditch 12, and a tail end of the rear-segment drainage ditch 12 is communicated with the pond via a second weir 14 at an upper part of the other side of the pond.
[0011] Further, the filler filter tank 3 is filled with an upper filler 4 and a lower filler 5.
[0012] Further, a plurality of aquaculture ponds share a set of filler filter tank 3 and mid-segment oxidation ditch 9.
[0013] Further, the suction pipe 8 has a diameter of 50 mm to 65 mm, arranged at a position of 50 mm to 100 mm from the bottom of the pond, has a length that is the width of the bottom of the pond, and is provided with four holes having a diameter of 15 mm to mm at equal intervals along the perimeter of the wall, a set of holes is formed every 100 mm along the pipe length, and one suction pipe 8 is arranged every 3 m to 5 m.
[0014] Further, the flow rate of the axial flow pump 1 per hour is one tenth of the total amount of water in the pond, its lift is 1.5 m to 2 m, and an outlet of the axial flow 20 pump is connected to the front-segment water inlet ditch 2.
[0015] Further, the mid-segment oxidation ditch has a depth of 2.5 m to 3 m, and its width and length meet the requirement that the water entering the ditch remains 8 min to 10 min in the ditch; the aeration pipes 11 are uniformly arranged at the bottom of the mid-segment oxidation ditch, with a total amount of 1 m to 2 m per square meter; and the air volume of the Roots blower 10 is 2 m3 per meter of aeration pipe.
[0016] Further, an inlet of the rear-segment drainage ditch 12 is close to the water surface at the tail end of the oxidation ditch; and the length of the second weir 14 is 2/3 of |u500116 the width of the pond.
[0017] A construction method of the above-mentioned oxidation ditch type microporous aeration aquaculture pond bottom water treatment system: a ditch is arranged on the circumference of an aquaculture pond, the ditch including a front segment, a middle segment and a rear segment; the bottom of the front segment is communicated with the bottom of the pond at one end by a plurality of parallel pipes spaced apart certain distance, to introduce bottom water of the pond into the ditch; the bottom water of the pond is filtered by a filter screen and fillers at the tail end of the front segment and then enters the mid-segment microporous aeration oxidation ditch; the middle segment is a quick oxygenation ditch, at the whole bottom of which a microporous aeration device is arranged and which has certain length, the water that flows into the oxidation ditch and is quickly oxygenated enters the rear-segment drainage ditch through a circulating pump at the tail end of the middle segment and flows back to the top of the aquaculture pond at the other end, and the above process enables the water with extremely low oxygen content at the bottom of the pond to flow back to the pond after quick oxygenation, and enables the bottom water of the pond to flow.
[0018] The beneficial effects of the invention are as follows:
[0019] 1) According to the distribution of oxygen content of top and bottom water ofthe pond, water containing nearly 0 mg/L of oxygen at the bottom of the pond is sucked out of the pond and introduced into the ditch by means of the suction pipes, the connecting pipe and the axial flow pump, and is filled by fillers to remove harmful substances in the water, meanwhile, top water with high oxygen content is supplemented to the bottom, thereby increasing the oxygen content of the bottom water, improving bottom water quality of the pond, and reducing the occurrence of diseases.
[0020] 2) By sucking the water containing nearly 0 mg/L of oxygen at the bottom of the pond out of the pond and introducing the water into the ditch, the treatment | ;500116 efficiency is improved; and by designing the depth of the ditch to be 2.5 m to 3 m, the dynamic efficiency is increased.
[0021] 3) All ditches can be covered by cover plates, so that the entire system 5 occupies a small area.
[0022] 4) From the bottom of one side of the pond, the saturated dissolved oxygen water flowing into the drainage ditch enters the pond via the weir arranged by the pond opposite to the water inlet ditch, to complete the exchange of top and bottom water of the pond, thereby propelling the flow of water in the pond from one side to the other side and increasing the dissolved oxygen content of the whole water in the pond.
[0023] 5) A system can be established for a pond or a plurality of parallel ponds, which reduces system construction cost and improves system efficiency.
[0024] 6) The space around the aquaculture pond is fully utilized, and the space occupied by water treatment equipment is saved.
[0025] 7) The bottom water with extremely low oxygen content is intensively oxygenated, which can greatly improve efficiency and reduce water treatment cost.
[0026] 8) The system is simple and convenient to operate, can solve the problem that the aeration equipment commonly used at present has difficulty in aerating bottom water of an aquaculture pond, and fully exerts the characteristics of high aeration efficiency of microporous aeration.
[0027] Fig. 1 is an oxidation ditch type microporous aeration aquaculture pond bottom water treatment system of the invention.
[0028] Fig. 2 is a cross-sectional view along A-A direction in Fig. 1.
[0029] Fig. 3 is a cross-sectional view along B-B direction in Fig. 1.
[0030] Fig. 4 is a three-dimensional cross-sectional view of a mid-segment | 5030116 oxidation ditch.
[0031] Fig. 5 is a three-dimensional cross-sectional view of a filler filter tank.
[0032] Fig. 6 is a cross-sectional view of a pond.
[0033] In the figures, 1-axial flow pump, 2-water inlet ditch, 3-filler filter tank, 4-upper filler, S-lower filler, 6-first weir, 7-suction main pipe, 8-suction pipe, 9-mid-segment oxidation tank, 10-Roots blower, 11-aeration pipe, 12-rear-segment drainage ditch, 13-pond, 14-second weir.
[0034] The invention is further described below with reference to the accompanying drawings and specific embodiments.
[0035] Referring to Figs. 1-5, an oxidation ditch type microporous aeration aquaculture pond bottom water treatment system includes an axial flow pump 1, suction pipes 8, a suction main pipe 7, a front-segment water inlet ditch 2, a filler filter tank 3, a mid-segment oxidation ditch 9, and a rear-segment drainage ditch 12; the suction pipes 8 are provided with a plurality of suction holes, the plurality of suction pipes 8 are arranged at intervals close to the bottom of a pond and communicated with the suction main pipe 7, the axial flow pump 1 is arranged on the suction main pipe 7, a tail end of the suction main pipe 7 extends out of one side of the pond and is communicated with the water inlet ditch 2, a tail end of the water inlet ditch 2 is communicated with an upper part of one side of the filler filter tank 3, a bottom of the other side of the filler filter tank 3 is provided with a first weir 16, the first weir 16 is communicated with one side of the mid-segment oxidation ditch 9, aeration pipes 11 are arranged at the bottom of the mid-segment oxidation ditch 9, the aeration pipes 11 are connected to a Roots blower 10, an upper part of the other side of the mid-segment oxidation ditch 9 is communicated with the rear-segment drainage ditch 12, and a tail end of the rear-segment drainage ditch 12 is 500116 communicated with the pond via a second weir 14 at an upper part of the other side of the pond.
[0036] In this embodiment, referring to Fig. 4, the filler filter tank 3 is filled with an upper filler 4 and a lower filler 5.
[0037] In this embodiment, a plurality of aquaculture ponds share a set of filler filter tank 3 and mid-segment oxidation ditch 9, not shown in the figures.
[0038] In this embodiment, the suction pipe 8 has a diameter of 50 mm to 65 mm, arranged at a position of 50 mm to 100 mm from the bottom of the pond, has a length that is the width of the bottom of the pond, and is provided with four holes having a diameter of 15 mm to 20 mm at equal intervals along the perimeter of the wall, a set of holes is formed every 100 mm along the pipe length, and one suction pipe 8 is arranged every 3 m to 5 m, not shown in the figures.
[0039] In this embodiment, referring to Fig. 1, the flow rate of the axial flow pump 1 per hour is one tenth of the total amount of water in the pond, its lift is 1.5 m to 2 m, and an outlet of the axial flow pump is connected to the front-segment water inlet ditch 2.
[0040] In this embodiment, the mid-segment oxidation ditch has a depth of 2.5 m to 3 m, and its width and length meet the requirement that the water entering the ditch remains 8 min to 10 min in the ditch; the aeration pipes 11 are uniformly arranged at the bottom of the mid-segment oxidation ditch, with a total amount of 1 m to 2 m per square meter; and the air volume of the Roots blower 10 is 2 m3 to 3 m3 per meter of aeration pipe.
[0041] In this embodiment, an inlet of the rear-segment drainage ditch 12 is close to the water surface at the tail end of the oxidation ditch; and the length of the second weir 14 is 2/3 of the width of the pond.
[0042] A construction method of the above-mentioned oxidation ditch type microporous aeration aquaculture pond bottom water treatment system: a ditch is arranged | 500116 on the circumference of an aquaculture pond, the ditch including a front segment, a middle segment and a rear segment; the bottom of the front segment is communicated with the bottom of the pond at one end by a plurality of parallel pipes spaced apart certain distance, to introduce bottom water of the pond into the ditch; the bottom water of the pond is filtered by a filter screen and fillers at the tail end of the front segment and then enters the mid-segment microporous aeration oxidation ditch; the middle segment is a quick oxygenation ditch, at the whole bottom of which a microporous aeration device is arranged and which has certain length, the water that flows into the oxidation ditch and is quickly oxygenated enters the rear-segment drainage ditch through a circulating pump at the tail end of the middle segment and flows back to the top of the aquaculture pond at the other end, and the above process enables the water with extremely low oxygen content at the bottom of the pond to flow back to the pond after quick oxygenation, and enables the bottom water of the pond to flow.
[0043] By constructing a front-segment water inlet ditch composed of a water inlet pipe arranged at the bottom of a pond, a low-lift axial flow pump mounted beside the pond and a filler tank, bottom water of the pond is introduced into the ditch beside the pond, so that medium and top water in the pond is exchanged to the bottom, which increases the dissolved oxygen of the bottom water and solves the problem of low oxygen content of the bottom water; meanwhile, the filler tank can solve contaminants in water flowing into the ditch; by arranging microporous aeration pipes at the mid-segment oxidation ditch having certain depth at the bottom of the ditch, and configuring reasonable technical parameters according to the volume of treated water, the problems that the water treatment satisfies certain residence time and the device occupies a large space are solved, and the characteristics of high oxygenation rate and high dynamic efficiency of microporous aeration are exerted; and by constructing a drainage ditch, the saturated dissolved oxygen water flowing into the drainage ditch enters the pond via the weir arranged by the pond | 500116 opposite to the water inlet ditch, to complete the exchange of top and bottom water of the pond, thereby propelling the flow of water in the pond from one side to the other side and increasing the dissolved oxygen content of the whole water in the pond.
[0044] The above describes the preferred embodiments of the invention, a person of ordinary skill in the art may further make variations or improvements on this basis without departing from the general conception of the invention, and these variations or improvements shall fall within the protection scope of the invention.
Claims (8)
1. An oxidation ditch type microporous aeration aquaculture pond bottom water treatment system, comprising an axial flow pump (1), suction pipes (8), a suction main pipe (7), a front-segment water inlet ditch (2), a filler filter tank (3), a mid-segment oxidation ditch (9), and a rear-segment drainage ditch (12); wherein the suction pipes (8) are provided with a plurality of suction holes, the plurality of suction pipes (8) are arranged at intervals close to the bottom of a pond and communicated with the suction main pipe (7), the axial flow pump (1) is arranged on the suction main pipe (7), a tail end of the suction main pipe (7) extends out of one side of the pond and is communicated with the water inlet ditch (2), a tail end of the water inlet ditch (2) is communicated with an upper part of one side of the filler filter tank (3), a bottom of the other side of the filler filter tank (3) is provided with a first weir (16), the first weir (16) is communicated with one side of the mid-segment oxidation ditch (9), aeration pipes (11) are arranged at the bottom of the mid-segment oxidation ditch (9), the aeration pipes (11) are connected to a Roots blower (10), an upper part of the other side of the mid-segment oxidation ditch (9) is communicated with the rear-segment drainage ditch (12), and a tail end of the rear-segment drainage ditch (12) is communicated with the pond via a second weir (14) at an upper part of the other side of the pond.
2. The oxidation ditch type microporous aeration aquaculture pond bottom water treatment system according to claim 1, wherein the filler filter tank (3) is filled with an upper filler (4) and a lower filler (5).
3. The oxidation ditch type microporous aeration aquaculture pond bottom water treatment system according to claim 1, wherein a plurality of aquaculture ponds share a set of filler filter tank (3) and mid-segment oxidation ditch (9).
4. The oxidation ditch type microporous aeration aquaculture pond bottom water treatment system according to claim 1, wherein the suction pipe (8) has a diameter of 50 | U500116 mm to 65 mm, arranged at a position of 50 mm to 100 mm from the bottom of the pond, has a length that is the width of the bottom of the pond, and is provided with four holes having a diameter of 15 mm to 20 mm at equal intervals along the perimeter of the wall, a set of holes is formed every 100 mm along the pipe length, and one suction pipe (8) is arranged every 3 m to 5 m.
5. The oxidation ditch type microporous aeration aquaculture pond bottom water treatment system according to claim 1, wherein the flow rate of the axial flow pump (1) per hour is one tenth of the total amount of water in the pond, its lift is 1.5 m to 2 m, and an outlet of the axial flow pump is connected to the front-segment water inlet ditch (2).
6. The oxidation ditch type microporous aeration aquaculture pond bottom water treatment system according to claim 1, wherein the mid-segment oxidation ditch has a depth of 2.5 m to 3 m, and its width and length meet the requirement that the water entering the ditch remains 8 min to 10 min in the ditch; the aeration pipes (11) are uniformly arranged at the bottom of the mid-segment oxidation ditch, with a total amount of 1 m to 2 m per square meter; and the air volume of the Roots blower (10) is 2 m3 to 3 m3 per meter of aeration pipe.
7. The oxidation ditch type microporous aeration aquaculture pond bottom water treatment system according to claim 1, wherein an inlet of the rear-segment drainage ditch (12) is close to the water surface at the tail end of the oxidation ditch; and the length of the second weir (14) is 2/3 of the width of the pond.
8. A construction method of the oxidation ditch type microporous aeration aquaculture pond bottom water treatment system according to claim 1, wherein a ditch is arranged on the circumference of an aquaculture pond, the ditch including a front segment, a middle segment and a rear segment; the bottom of the front segment is communicated with the bottom of the pond at one end by a plurality of parallel pipes spaced apart certain distance, to introduce bottom water 500116 of the pond into the ditch; and the bottom water of the pond is filtered by a filter screen and fillers at the tail end of the front segment and then enters the mid-segment microporous aeration oxidation ditch; the middle segment is a quick oxygenation ditch, at the whole bottom of which a microporous aeration device is arranged and which has certain length, the water that flows into the oxidation ditch and is quickly oxygenated enters the rear-segment drainage ditch through a circulating pump at the tail end of the middle segment and flows back to the top of the aquaculture pond at the other end, and the above process enables the water with extremely low oxygen content at the bottom of the pond to flow back to the pond after quick oxygenation, and enables the bottom water of the pond to flow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500116A LU500116B1 (en) | 2021-04-30 | 2021-04-30 | Oxidation ditch type microporous aeration aquaculture pond bottom water treatment system and construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| LU500116A LU500116B1 (en) | 2021-04-30 | 2021-04-30 | Oxidation ditch type microporous aeration aquaculture pond bottom water treatment system and construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| LU500116B1 true LU500116B1 (en) | 2021-11-03 |
Family
ID=78466311
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| LU500116A LU500116B1 (en) | 2021-04-30 | 2021-04-30 | Oxidation ditch type microporous aeration aquaculture pond bottom water treatment system and construction method |
Country Status (1)
| Country | Link |
|---|---|
| LU (1) | LU500116B1 (en) |
-
2021
- 2021-04-30 LU LU500116A patent/LU500116B1/en active IP Right Grant
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| Date | Code | Title | Description |
|---|---|---|---|
| FG | Patent granted |
Effective date: 20211103 |