CN106582077A - Siphon filtering pool and back washing technology thereof - Google Patents
Siphon filtering pool and back washing technology thereof Download PDFInfo
- Publication number
- CN106582077A CN106582077A CN201611200398.9A CN201611200398A CN106582077A CN 106582077 A CN106582077 A CN 106582077A CN 201611200398 A CN201611200398 A CN 201611200398A CN 106582077 A CN106582077 A CN 106582077A
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- China
- Prior art keywords
- backwash
- water
- cell body
- filter
- draining
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
- B01D24/10—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being held in a closed container
- B01D24/12—Downward filtration, the filtering material being supported by pervious surfaces
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/38—Feed or discharge devices
- B01D24/44—Feed or discharge devices for discharging filter cake, e.g. chutes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
- B01D24/46—Regenerating the filtering material in the filter
- B01D24/4631—Counter-current flushing, e.g. by air
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/281—Treatment of water, waste water, or sewage by sorption using inorganic sorbents
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/12—Halogens or halogen-containing compounds
- C02F2101/14—Fluorine or fluorine-containing compounds
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a siphon filtering pool. The siphon filtering pool comprises a filtering pool body with at least eight boxes, and the filtering pool body is provided with a water feeding pipe and a clear water discharging pipe. An ABS filtering plate is arranged at the lower portion of the filtering pool body, a supporting layer is laid on the ABS filtering plate, an active-magnesium-oxide-adsorbed filter material layer is laid on the supporting layer, a regenerated liquid canal is arranged at the upper portion of the pool wall of the outer side of the filtering pool body, a back-washing water draining hole is formed in he upper portion of the pool wall of the outer side of the filtering pool body, and a back-washing water draining flap gate is installed at the upper portion of the pool wall of the outer side of the filtering pool body, a regenerated liquid backflow pipe is arranged above the back-washing water draining hole, an emptying pipe, a back washing pipe and a back washing gas pipe are sequentially arranged at lower portion of the pool wall of the outer side of the filtering pool body from bottom to top, a single-box clear water discharging veranda is arranged at the left portion of the filtering pool body, a main clear-water-discharging canal is communicated to the upper portion of the single-box clear water discharging veranda, and the single-box clear water discharging veranda and the pool-body space below the supporting layer are adjacent. The siphon filtering pool is simple and reasonable in structure and efficient and environment-friendly in operation.
Description
Technical field
The present invention relates to it is a kind of simple and reasonable, run the siphon filter and its backwash technique of high-efficiency environment friendly.
Background technology
Siphon filter is one of structures of water engineering water process, is also one of higher filter tank of automaticity, it
It is more simple to operate than general filter tank, it is less demanding to specialized management technical merit, without large size valve and special backwashing equipment, easily
In automatically controlling.But the small resistance water wiring system that siphon filter is adopted, commonly uses reinforced concrete filter plate, there is water distribution uniformity
Difference, backwash head is low, so that backwash is uneven, affects the using effect in effluent quality and filter tank, and has Lou sand phenomenon,
Blocking water distribution gallery, causes filtering function and backwashing function heavy damage, when filter loading is too little, in backwash, according to
By itself aquifer yield, it is not enough to maintain normal backwash, affects developing result.
Such as Chinese Patent Application No.：201520175921.1, full-automatic novel siphon filter is disclosed, it is related to a kind of filtration
Pond processing meanss, a kind of more particularly to pond processing meanss of full-automatic novel siphon, it includes siphon filter cell body, with
The water inlet pipe that cell body is connected, is placed in the turning spurt water device of siphon filter upper position, be arranged at the magnetic iron ore of middle and lower part position/
Quartz sand, rubble, concrete filter.Siphon bucket above magnetic iron ore/quartz sand and connect its siphon, siphon destructing tube,
Microstrainer is additionally provided with the bottom righthand side of concrete filter.Filtered water tank, the pressure backwash for connecting altogether is set on siphon filter cell body side
Equipment.Additionally, being additionally provided with manhole, air vent and sewage draining exit.
The content of the invention
It is an object of the present invention to overcome the drawbacks described above of prior art, there is provided a kind of simple and reasonable, operation is efficient
Environmental protection, magnesium oxide is coated with the polyethersulfone blended active oxygen for making magnesium oxide-polyethersulfone composite membrane using ABS filter plates and employing
Change magnesium absorbent filter medium layer, and the siphon filter and its backwash technique with backwash draining flap gate.
For achieving the above object, the technical scheme that the present invention is provided is as follows：A kind of siphon filter, is furnished with including at least 8 lattice
The filter tank cell body of inlet pipeline and clear water outlet pipeline, the bottom of filter tank cell body is provided with ABS filter plates, is equipped with ABS filter plates
Supporting layer, is equipped with activated magnesia absorbent filter medium layer on the supporting layer, in filter tank, the top of the outside pool wall of cell body is provided with
Regenerated liquid canal and it is provided with backwash osculum and backwash draining flap gate is installed, backwash osculum top is provided with regeneration
Liquid return duct, the bottom of the outside pool wall of filter tank cell body is sequentially provided with from down to up blow-down pipe, backwash water pipe, backwash gas
Pipe, in filter tank, the left part of cell body is provided with single lattice clear water water outlet corridor, and single lattice clear water water outlet is communicated with the total canal of clear water water outlet above corridor,
Single lattice clear water water outlet corridor is adjacent with the cell body space below supporting layer.
According to above technical requirements, the regenerated liquid return duct is connected with regeneration liquid pump, and regeneration liquid pump is located at a transfusion tank
It is interior, be connected with regeneration liquid pipe in transfusion tank, regenerated liquid Gutron cross one four-way of setting be connected to regenerated liquid waste liquid evacuated tube and
It is connected with backwash water pipe.
According to above technical requirements, water intaking valve is provided with the inlet pipeline, clear water water outlet is provided with clear water outlet pipeline
Valve, clear water outlet valve is in the total canal of clear water water outlet.
According to above technical requirements, the blow-down pipe, backwash water pipe, backwash trachea are respectively provided with valve, emptying
, located at bottom of pond 50-150mm away from filter tank cell body, the one end of backwash water pipe is located at the bottom of pond away from filter tank cell body for the one end of pipe
200-300mm, the one end of backwash trachea is located at bottom of pond 500-600mm away from filter tank cell body.
According to above technical requirements, the filter tank cell body top passes through backwash draining flap gate by backwash osculum
Separate with filter tank cell body dynamic.
According to above technical requirements, the supporting layer is specially the cobblestone support that 50-150mm thickness, particle diameter are 2-5mm
Layer.
According to above technical requirements, long handle gas/water reversely-flushing filter head is installed on the ABS filter plates.
According to above technical requirements, the upper end and lower end of the activated magnesia absorbent filter medium layer are respectively coated with oxidation
Magnesium makes magnesium oxide-polyethersulfone composite membrane with polyethersulfone blended.
According to above technical requirements, the activated magnesia in the activated magnesia absorbent filter medium layer is particulate form, its grain
Footpath is 0.5-1mm.
A kind of backwash technique of siphon filter, it is characterised in that：The step of technique, includes：
1) water intaking valve and clear water outlet valve are closed, keeps, in highest controlling water level in the cell body of filter tank, opening backwash air valve
Individually to filter tank cell body air purge 3min, then stop air purge 30s, then open backwash draining flap gate draining, filter tank cell body
Water level close backwash draining flap gate when draining into the turnover panel bottom of backwash draining flap gate；
2) opening backwash water valve and backwash air valve carries out steam mixing and washes, until the water level of filter tank cell body reaches highest
During controlling water level, close backwash water valve and backwash air valve stops mixing and washes after 30s, open backwash draining flap gate row
Backwash draining flap gate is closed in water, pool inner water position when draining into backwash draining flap gate bottom；
3) gas-vapor mix of repeat step 2 is washed time；
4) opening backwash water valve carries out single water backwash and washes, until the water level of filter tank cell body reaches highest controlling water level
When, to close backwash water valve and stop after washing 30s, opening backwash draining flap gate draining, pool inner water position drains into backwash
Backwash draining flap gate is closed during draining flap gate bottom；
5) repeat step 4 is washed 1-3 time, until drainage turbidity meets the requirements.
Usefulness of the present invention is：By by the rhone inside existing siphon filter, siphon, filtrate and filter block
All remove, merely with filter tank cell body, be effectively increased filter area, creative arranging in siphon filter is coated with magnesium oxide
With the polyethersulfone blended activated magnesia absorbent filter medium layer for making magnesium oxide-polyethersulfone composite membrane, effectively high-fluorine water is dropped
Solution, activated magnesia not easy in inactivation reduces regeneration frequency, and regenerative process is simple, takes cycle is short, and fertile absorber price is just
Preferably, save material cost, creative filter tank cell body top by backwash draining flap gate by backwash osculum with
Filter tank cell body dynamic separates, and with this filter tank cell body backwashing procedures are adjusted, and process efficient is rational in infrastructure, improves efficiency of operation, section
The effect that can lower consumption is obvious.
Description of the drawings
Fig. 1 is the structural representation of siphon filter of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawings and preferred embodiment is further described with regard to technical scheme.
As shown in figure 1, a kind of siphon filter of the present invention, is furnished with inlet pipeline 11 and Graceful including at least 8 lattice
The filter tank cell body 1 of water lines 12, the bottom of filter tank cell body 1 is provided with ABS filter plates 2, and supporting layer 3, institute are equipped with ABS filter plates 2
State and activated magnesia absorbent filter medium layer 4 is equipped with supporting layer 3, the top of the outside pool wall of cell body 1 is provided with regenerated liquid in filter tank
Canal 5 and it is provided with backwash osculum 50 and backwash draining flap gate 51 is installed, the top of backwash osculum 50 is provided with again
Raw liquid return duct 52, the bottom of the outside pool wall of filter tank cell body 1 be sequentially provided with from down to up blow-down pipe 21, backwash water pipe 22,
Backwash trachea 23, in filter tank, the left part of cell body 1 is provided with single lattice clear water water outlet corridor 6, and the top of single lattice clear water water outlet corridor 6 is communicated with
The total canal 7 of clear water water outlet, single lattice clear water water outlet corridor 6 is adjacent with the cell body space of the lower section of supporting layer 3.
Further, the regenerated liquid return duct 52 is connected with regeneration liquid pump (attached not shown), in regenerated liquid return duct 52
Regenerated liquid reflux inlet 58 is provided with, regeneration liquid pump is connected with regeneration liquid pipe 54, regenerated liquid in a transfusion tank 53 in transfusion tank 53
Pipe 54 is connected to regenerated liquid waste liquid evacuated tube 55 and is connected with backwash water pipe 23 by arranging a four-way (attached not shown),
Regenerated liquid waste liquid exhaust-valve 56 is provided with regenerated liquid waste liquid evacuated tube 55, in regeneration liquid pipe 54 regenerated liquid valve 57 is provided with.
Further, water intaking valve 13 is provided with the inlet pipeline 11, clear water outlet valve is provided with clear water outlet pipeline 12
14, clear water outlet valve 14 is in the total canal 7 of clear water water outlet.
Further, atmospheric valve 24, anti-is respectively equipped with the blow-down pipe 21, backwash water pipe 22, backwash trachea 23
Rinse water valve 25, backwash air valve 26, the one end of blow-down pipe 21 is located at bottom of pond 100mm away from filter tank cell body 1, backwash water pipe
, located at bottom of pond 200mm away from filter tank cell body 1, the one end of backwash trachea 23 is located at the pond away from filter tank cell body 1 for 22 one end
Bottom 500mm.
Further, some long handle gas/water reversely-flushing filter heads 27, long handle air-water backwashing are installed on the ABS filter plates 2
Filter 27 extends to the lower section of ABS filter plates 2 from the top of ABS filter plates 2；The top of filter tank cell body 1 passes through backwash draining panel turnover sluice gate
Door 51 separates backwash osculum 50 with the dynamic of filter tank cell body 1, when in filter tank, cell body 1 needs backwashing procedures：1) close into
Water valve 13 and clear water outlet valve 14, keep in highest controlling water level in filter tank cell body 1, open backwash air valve 26 individually to filter tank
The air purge 3min of cell body 1, then stops air purge 30s, then opens the draining of backwash draining flap gate 51, the water level of filter tank cell body 1
Backwash draining flap gate 51 is closed when draining into the turnover panel bottom of backwash draining flap gate 51；2) backwash water valve 25 is opened
And backwash air valve 26 carries out steam mixing and washes, and when the water level of filter tank cell body 1 reaches highest controlling water level, closes backwash
Water valve 25 and backwash air valve 26 stop mixing and wash after 30s, open the draining of backwash draining flap gate 51, and pool inner water position drains into
Backwash draining flap gate 51 is closed during backwash draining 51 bottom of flap gate；3) repeat previous step gas-vapor mix and wash 1 time；4)
Opening backwash water valve 25 carries out single water backwash and washes, and when the water level of filter tank cell body 1 reaches highest controlling water level, closes anti-
Rinse water valve 25 stops after washing 30s, opens the draining of backwash draining flap gate 51, and pool inner water position drains into backwash draining and turns over
Backwash draining flap gate 51 is closed during plate 51 bottom of gate；5) repeat previous step to wash 1-3 time, until drainage turbidity is conformed to
Ask.
Further, the supporting layer 3 is specially the cobblestone supporting layer of 50mm thickness, particle diameter for 3mm.
Further, the activated magnesia in the activated magnesia absorbent filter medium layer 4 is particulate form, and its particle diameter is
0.5-1mm, because particulate form activated magnesia is not easily recycled, it is difficult to reuse, therefore in the activated magnesia absorbent filter medium
The upper end and lower end of layer 4 is respectively coated with magnesium oxide and overcomes this with polyethersulfone blended magnesium oxide-polyethersulfone composite membrane of making
Defect.
Absorbent filter medium layer reproducer：1) after decontamination backwash terminates, the regenerated liquid that regenerated liquid passes in and out filter tank cell body 1 is opened
Valve 57 and regeneration liquid pump, will uniformly allocate activity in regeneration liquid pipe 54 of the magnesium sulfate actified solution for having configured under ABS filter plates 2
Magnesium oxide adsorbing filter material layer 4 carries out contact regeneration, and after contact a period of time, regenerated liquid is returned from the regenerated liquid on the top of filter tank cell body 1
Flow tube 52 is back in fluid reservoir 53, is then pumped under the ABS filter plates 2 of filter tank cell body 1 again by regenerated liquid, so circulation
About 4h completes regenerative process, stops regeneration liquid pump, closes the regenerated liquid valve 57 that regenerated liquid passes in and out filter tank cell body 1；2) regeneration is opened
Liquid waste liquid exhaust-valve 56, by regeneration liquid waste waste collection pond is discharged into；Regenerated liquid waste liquid exhaust-valve 56 is closed after emptying；3) open
The clear water outlet valve 14 of filter tank cell body 1, is redirected back into filter tank cell body 1, until water level using the clear water in single lattice clear water water outlet corridor 6
Flood after activated magnesia absorbent filter medium layer 4 and close clear water outlet valve 14, soak 5min；4) secondary counter flushing is carried out.
Above-described is only the principle of the present invention and preferred embodiment.It should be pointed out that the ordinary skill people to this area
For member, under the premise without departing from the principles of the invention, moreover it is possible to make some modification and improvement, also should be regarded as belonging to the present invention
Protection domain.
Claims (10)
1. a kind of siphon filter, is furnished with the filter tank cell body of inlet pipeline and clear water outlet pipeline, filter tank cell body including at least 8 lattice
Bottom be provided with ABS filter plates, be equipped with supporting layer on ABS filter plates, it is characterised in that：Active oxidation is equipped with the supporting layer
Magnesium absorbent filter medium layer, in filter tank, the top of the outside pool wall of cell body is provided with regenerated liquid canal and is provided with backwash osculum and is provided with
Backwash draining flap gate, backwash osculum top is provided with regenerated liquid return duct, the bottom of the outside pool wall of filter tank cell body
Blow-down pipe, backwash water pipe, backwash trachea are sequentially provided with from down to up, and in filter tank, the left part of cell body is provided with single lattice clear water water outlet
Corridor, is communicated with the total canal of clear water water outlet above single lattice clear water water outlet corridor, single lattice clear water water outlet corridor is empty with the cell body below supporting layer
Between it is adjacent.
2. siphon filter according to claim 1, it is characterised in that：The regenerated liquid return duct is connected with regeneration liquid pump,
Regeneration liquid pump is connected with regeneration liquid pipe in a transfusion tank in transfusion tank, regenerated liquid Gutron is crossed one four-way of setting and connected respectively
There is regenerated liquid waste liquid evacuated tube and be connected with backwash water pipe.
3. siphon filter according to claim 1, it is characterised in that：Water intaking valve, Graceful are provided with the inlet pipeline
Clear water outlet valve is provided with water lines, clear water outlet valve is in the total canal of clear water water outlet.
4. siphon filter according to claim 1, it is characterised in that：The blow-down pipe, backwash water pipe, backwash trachea
Valve is respectively provided with, the one end of blow-down pipe is located at bottom of pond 50-150mm away from filter tank cell body, the one end of backwash water pipe
Located at bottom of pond 200-300mm away from filter tank cell body, the one end of backwash trachea is located at bottom of pond 500- away from filter tank cell body
600mm。
5. siphon filter according to claim 1, it is characterised in that：Turned over by backwash draining on the filter tank cell body top
Plate gate separates backwash osculum with filter tank cell body dynamic.
6. siphon filter according to claim 1, it is characterised in that：The supporting layer is specially 50-150mm thickness, grain
Footpath is the cobblestone supporting layer of 2-5mm.
7. siphon filter according to claim 1, it is characterised in that：Long handle air water back washing is installed on the ABS filter plates
Filter wash head.
8. siphon filter according to claim 1, it is characterised in that：The upper end of the activated magnesia absorbent filter medium layer and
Lower end is respectively coated with magnesium oxide and makes magnesium oxide-polyethersulfone composite membrane with polyethersulfone blended.
9. siphon filter according to claim 1, it is characterised in that：Activity in the activated magnesia absorbent filter medium layer
Magnesium oxide is particulate form, and its particle diameter is 0.5-1mm.
10. a kind of backwash technique of siphon filter according to claim 1, it is characterised in that：The step of technique
Including：
1) water intaking valve and clear water outlet valve are closed, keeps, in highest controlling water level in the cell body of filter tank, opening backwash air valve independent
To filter tank cell body air purge 3min, then stop air purge 30s, then open backwash draining flap gate draining, the water of filter tank cell body
Backwash draining flap gate is closed in position when draining into the turnover panel bottom of backwash draining flap gate；
2) opening backwash water valve and backwash air valve carries out steam mixing and washes, until the water level of filter tank cell body reaches highest control
During water level, close backwash water valve and backwash air valve stop mixing and washes after 30s, open backwash draining flap gate draining,
Backwash draining flap gate is closed in pool inner water position when draining into backwash draining flap gate bottom；
3) gas-vapor mix of repeat step 2 is washed time；
4) opening backwash water valve carries out single water backwash and washes, and when the water level of filter tank cell body reaches highest controlling water level, closes
Close backwash water valve to stop after washing 30s, opening backwash draining flap gate draining, pool inner water position drains into backwash draining and turns over
Backwash draining flap gate is closed during plate gate bottom；
5) repeat step 4 is washed 1-3 time, until drainage turbidity meets the requirements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611200398.9A CN106582077A (en) | 2016-12-22 | 2016-12-22 | Siphon filtering pool and back washing technology thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611200398.9A CN106582077A (en) | 2016-12-22 | 2016-12-22 | Siphon filtering pool and back washing technology thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106582077A true CN106582077A (en) | 2017-04-26 |
Family
ID=58602767
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201611200398.9A Pending CN106582077A (en) | 2016-12-22 | 2016-12-22 | Siphon filtering pool and back washing technology thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106582077A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115594297A (en) * | 2022-12-15 | 2023-01-13 | 江苏龙腾工程设计股份有限公司（Cn） | Combined multistage biological purification filter and implementation method thereof |
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| CN204865132U (en) * | 2015-03-27 | 2015-12-16 | 徐州工程学院 | Full -automatic novel siphon filtering pond |
| CN205391844U (en) * | 2016-03-03 | 2016-07-27 | 河南城建学院 | Intelligent anti - washing unit in flap valve filtering pond |
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| JPS60110308A (en) * | 1983-11-16 | 1985-06-15 | Fuso Kensetsu Kogyo Kk | Rapid filter |
| CN1640523A (en) * | 2004-01-08 | 2005-07-20 | 杨静 | Multi-dimensional space filter material scrubbing method |
| CN2712430Y (en) * | 2004-04-13 | 2005-07-27 | 深圳市金铃水工业自动化系统有限公司 | Air water reverse flushing device for filter tank |
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| CN205391844U (en) * | 2016-03-03 | 2016-07-27 | 河南城建学院 | Intelligent anti - washing unit in flap valve filtering pond |
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| Title |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115594297A (en) * | 2022-12-15 | 2023-01-13 | 江苏龙腾工程设计股份有限公司（Cn） | Combined multistage biological purification filter and implementation method thereof |
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Application publication date: 20170426 |