CN218403850U - Coupling microbiological nitrogen and phosphorus removal treatment system using iron-carbon filler - Google Patents
Coupling microbiological nitrogen and phosphorus removal treatment system using iron-carbon filler Download PDFInfo
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- CN218403850U CN218403850U CN202221974844.2U CN202221974844U CN218403850U CN 218403850 U CN218403850 U CN 218403850U CN 202221974844 U CN202221974844 U CN 202221974844U CN 218403850 U CN218403850 U CN 218403850U
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- 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
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- 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
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Abstract
A coupled microorganism nitrogen and phosphorus removal treatment system using iron-carbon filler comprises a nitrogen and phosphorus removal device and filler. The nitrogen and phosphorus removal device comprises a biochemical tank. The biochemical tank comprises a plurality of filler suspension devices arranged in the biochemical tank. The filler suspension device comprises a stainless steel bracket, a movable buckle and a filler frame. The filler comprises iron-carbon composite filler and polyurethane filler. The polyurethane filler and the iron-carbon composite filler are uniformly distributed in the biochemical pool. The growth of nitrifying bacteria is promoted by adding the sponge iron, the sulfur powder and the activated carbon into the iron-carbon composite filler, and particularly, the sulfur autotrophic denitrification is added into the sulfur powder to promote the sponge iron to corrode and generate H 2 And the nitrogen and phosphorus removal effect can be effectively improved, and the normal operation of the treatment facility is ensured to be stable and discharge to reach the standard. And the iron-carbon composite filler is placed in the filler suspension device, so that the effective contact surface with domestic sewage can be improved, the treatment efficiency is improved, and meanwhile, the replacement of the filler can be facilitated.
Description
Technical Field
The utility model relates to a sewage treatment device technical field, in particular to a coupled microorganism method nitrogen and phosphorus removal treatment system using iron-carbon filler.
Background
Along with the continuous acceleration of the urbanization process of China, the living standard of people in rural areas is continuously improved, the requirement on the quality of living environment is higher and higher, and the standard treatment of domestic sewage has important influence on the quality of the environment. Nitrogen and phosphorus are always recognized pollutants which are difficult to treat, the surrounding water body is seriously damaged due to the over-high content of the nitrogen and the phosphorus, the eutrophication of the water body is caused, and the rural domestic sewage is dispersed, the water quality components are complex, and the nitrogen and the phosphorus treatment is very difficult.
Most of the existing domestic sewage treatment equipment adopts an A2/O treatment process, for example, a nitrogen and phosphorus removal device adopting an A2/O method with the patent number of CN201320864103.3, on the traditional process that an A2/O process alternately operates under three different environmental conditions of anaerobic, anoxic and aerobic and microbial flora such as phosphorus accumulating bacteria (PAO) denitrifying bacteria and nitrobacteria coexist in the same sludge system, aiming at the problem of insufficient carbon source of the traditional A2/O process, an anoxic tank is arranged in front, and microorganisms directly utilize inlet water organic matters as a carbon source in an anoxic section, so that nitrate nitrogen caused by returned sludge is denitrified, and simultaneously the problems that the process carbon source is insufficient and nitrate enters an anaerobic zone to interfere with phosphorus release, so that the purposes of synchronous nitrogen and phosphorus removal are realized.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a coupling microbiological method nitrogen and phosphorus removal processing system that uses iron carbon filler that can solve above-mentioned problem.
A coupled microbiological nitrogen and phosphorus removal treatment system using iron-carbon filler comprises a nitrogen and phosphorus removal device, two fillers arranged in the nitrogen and phosphorus removal device, and an artificial wetland arranged behind the nitrogen and phosphorus removal device. The nitrogen and phosphorus removal device comprises a biochemical tank. The biochemical tank comprises a plurality of filler suspension devices arranged in the biochemical tank. The packing suspension device comprises a stainless steel bracket, a movable buckle positioned at one end of the stainless steel bracket and a plurality of packing frames arranged on the stainless steel bracket. The stainless steel support is a long rod made of stainless steel. The movable buckle is a J-shaped buckle positioned at the end part of the stainless steel. The packing frames are arranged on the stainless steel support at intervals, and the frame body is of a hollow structure. The filler comprises an iron-carbon composite filler arranged in the filler suspension device and a spherical polyurethane filler. The polyurethane filler and the iron-carbon composite filler are uniformly distributed in the biochemical pool.
Furthermore, the nitrogen and phosphorus removal device also comprises a grid filter tank, a vertical flow sedimentation tank arranged behind the biochemical tank and a sludge tank arranged behind the vertical flow sedimentation tank, wherein a grid and a booster water pump are arranged in the grid filter tank.
Furthermore, the biochemical tank further comprises a first anaerobic tank arranged behind the grid filter tank, a second anaerobic tank arranged behind the first anaerobic tank, an anoxic tank arranged behind the second anaerobic tank, a first aerobic tank arranged behind the anoxic tank, and a second aerobic tank arranged behind the first aerobic tank, wherein the anoxic tank, the first aerobic tank and the second aerobic tank are all internally provided with an aeration device.
Furthermore, a group of electrodes positioned on the pool wall and a nitrifying liquid return channel communicated with the anoxic pool are arranged in the second aerobic pool, and the electrodes are a group of negative electrodes and positive electrodes.
Furthermore, set up one in the vertical flow sedimentation tank with the draft tube that biochemical pond links to each other, one with the overflow pipe that the constructed wetland connector links to each other, and one with the mud back flow that first anaerobism pond links to each other, the draft tube sets up the top of the pool center in vertical flow sedimentation tank, the overflow pipe along the pool wall setting in vertical flow sedimentation tank to be located near the top of the pool department, the mud back flow sets up vertical flow sedimentation tank with between the first anaerobism pond.
Further, constructed wetland includes a one-level constructed wetland, and a setting is in oxygenating the pond behind the one-level constructed wetland, a setting is in oxygenating the second grade constructed wetland behind the pond, and a setting is in clean water basin behind the second grade constructed wetland, set up an observation port that exposes the pool face on one-level constructed wetland, the second grade constructed wetland, the bottom of the pool of oxygenating pond, second grade constructed wetland set up an evacuation pipe, the evacuation pipe is followed level constructed wetland keeps away from oxygenate the pool wall in pond and get into, oxygenate the pond with set up one in the clean water basin aeration equipment, second grade constructed wetland with water pipe between the clean water basin is through an ultraviolet disinfection equipment.
Furthermore, the artificial wetland also comprises a plurality of connecting water holes arranged on the wall of the pool.
Furthermore, the primary artificial wetland is connected with the vertical flow sedimentation tank through a water pipe, a goose pebble layer with the thickness of 25cm and the thickness of 3-10 cm, a multifunctional phosphorus removal ceramsite layer with the thickness of 20cm and the thickness of 2-3 cm, a limestone layer with the thickness of 15cm and the thickness of 1-2 cm, an activated zeolite layer with the thickness of 15cm and the thickness of 0.5-1 cm, a volcanic rock layer with the thickness of 15cm and the wetland plants planted on the surface of the tank are sequentially arranged in the tank from the bottom of the tank to the top of the tank.
Furthermore, the second-stage artificial wetland 33 is sequentially provided with a cobble layer with the thickness of 25cm and the thickness of 3-10 cm, a multifunctional dephosphorizing ceramsite layer with the thickness of 15cm and the thickness of 2-3 cm, an activated zeolite layer with the thickness of 20cm and the thickness of 0.5-1 cm, a coarse sand layer with the thickness of 15cm and the thickness of more than 0.5 cm, a vermiculite layer with the thickness of 15cm and the thickness of 0.3-6 cm, and wetland plants planted on the surface of the pond.
Compared with the prior art, the utility model provides an use coupling microbiological method nitrogen and phosphorus removal processing system of iron carbon filler passes through on traditional "anaerobism-oxygen deficiency-good oxygen" (A2/O) treatment process is the basis set up in the biochemical pond iron carbon composite filler and spherical polyurethane filler, through iron carbon composite filler fills upThe sponge iron, sulfur powder and active carbon are added into the feed to promote the growth of nitrobacteria, and particularly, the sulfur autotrophic denitrification is added into the sulfur powder to promote the sponge iron to corrode and generate H 2 And the nitrogen and phosphorus removal effect can be effectively improved, and the normal operation of the treatment facility is ensured to be stable and discharge to reach the standard. And the iron-carbon composite filler is placed in the filler suspension device, so that the effective contact surface with domestic sewage can be improved, the treatment efficiency is improved, and meanwhile, the replacement of the filler can be facilitated.
Drawings
FIG. 1 is a schematic top view of a coupled microorganism denitrification and dephosphorization treatment system using iron-carbon filler provided by the present invention.
FIG. 2 is a schematic structural diagram of a filler suspension device of a coupled microorganism denitrification and dephosphorization treatment system using iron-carbon filler in FIG. 1.
Fig. 3 is a schematic structural diagram of an artificial wetland of the coupled microbial denitrification and dephosphorization treatment system using the iron-carbon filler in fig. 1.
Detailed Description
Specific examples of the present invention will be described in further detail below. It should be understood that the description herein of embodiments of the invention is not intended to limit the scope of the invention.
As shown in fig. 1 to fig. 3, it is a schematic structural diagram of a system for nitrogen and phosphorus removal by coupled microorganism method using iron-carbon filler provided by the present invention. The coupled microorganism nitrogen and phosphorus removal treatment system using the iron-carbon filler comprises a nitrogen and phosphorus removal device 10, two fillers 20 arranged in the nitrogen and phosphorus removal device 10, and an artificial wetland 30 arranged behind the nitrogen and phosphorus removal device 10. It is contemplated that the coupled microbial denitrification and dephosphorization treatment system using iron-carbon filler further comprises other functional modules, such as connecting water pipes, control circuits, etc., which are well known to those skilled in the art and will not be described herein.
The nitrogen and phosphorus removal device 10 comprises a grid filter tank 11, a biochemical tank 12 arranged behind the grid filter tank 11, a vertical flow sedimentation tank 13 arranged behind the biochemical tank 12, and a sludge tank 14 arranged behind the vertical flow sedimentation tank 13. A grid 111 and a booster pump 112 are arranged in the grid filter tank 11. The grating 111 is arranged in the center of the grating filter tank 11 to primarily filter large-particle materials in the sewage. The booster water pump 112 is arranged at a water pipe connected with the first anaerobic tank 12 in the grid filter tank 11 so as to send the sewage in the grid filter tank 11 into the biochemical tank 12. The biochemical tank 12 includes a first anaerobic tank 121 disposed behind the grid filter tank 11, a second anaerobic tank 122 disposed behind the first anaerobic tank 121, an anoxic tank 123 disposed behind the second anaerobic tank 122, a first aerobic tank 124 disposed behind the anoxic tank 123, a second aerobic tank 125 disposed behind the first aerobic tank 124, and a plurality of packing suspension devices 126 disposed in the biochemical tank 12. The biochemical tank 12 employs an anaerobic-anoxic-aerobic (A2/O) treatment process, which is a prior art and well known to those skilled in the art, and thus the reaction processes of the process will not be described in detail herein. An aeration device 1251 is arranged in each of the anoxic tank 123, the first aerobic tank 124 and the second aerobic tank 125 so as to adjust the oxygen concentration in the corresponding biochemical tank and provide the environmental conditions for the reaction of microorganisms. The aeration device 1251 is a prior art and should be well known to those skilled in the art and will not be described in detail herein. A set of electrodes 1252 are arranged in the second aerobic tank 125 and a nitrified liquid return channel 1253 is arranged to the anoxic tank 123. The electrodes 1252 are a group of cathode and anode electrodes, and are used for introducing current by electrifying under the condition of low carbon-nitrogen ratio, so as to promote the denitrification reaction of the filler 20, thereby improving the efficiency of nitrogen and phosphorus removal. One end of the nitrified liquid backflow channel 1253 is arranged at the bottom of the second aerobic tank 125, and the other end of the nitrified liquid backflow channel 1253 is arranged on the wall of the anoxic tank 123, so that the nitrified liquid in the second aerobic tank 125 is conveyed into the anoxic tank 123, and the continuous reaction in the biochemical tank is ensured. The packing suspension device 126 includes a stainless steel bracket 1261, a movable snap 1262 at one end of the stainless steel bracket 1261, and a plurality of packing frames 1263 disposed on the stainless steel bracket. The stainless steel bracket 1261 is a long rod made of stainless steel for supporting and connecting other components on the packing suspension device 126. The movable snap 1262 is a J-shaped snap on the stainless steel end to secure the packing suspension device 126 itself. The packing frames 1263 are arranged on the stainless steel bracket 1261 at intervals, so that the effective contact surface with domestic sewage is improved, the treatment efficiency is improved, and meanwhile, the replacement of packing is convenient; the frame body adopts hollow out construction to guarantee to place in the frame filler 20 can take place abundant reaction with domestic sewage.
A guide cylinder 131 connected with the biochemical tank 12, an overflow pipe 132 connected with the connector of the artificial wetland 30, and a sludge return pipe 133 connected with the first anaerobic tank 121 are arranged in the vertical flow sedimentation tank 13. The guide cylinder 131 is arranged in the center of the top of the vertical flow sedimentation tank 13 to send the sludge water after nitrogen and phosphorus removal into the vertical flow sedimentation tank 13 for sludge-water separation. The overflow pipe 132 is arranged along the wall of the vertical flow sedimentation tank 13 and is positioned near the top of the tank to collect supernatant liquid after the separation of sludge and water and convey the supernatant liquid into the artificial wetland 30. The sludge return pipe 133 is disposed between the vertical sedimentation tank 13 and the first anaerobic tank 121, so as to deliver the sludge return liquid back to the first anaerobic tank 121 through the sludge return pipe 133. And discharging sludge subjected to sludge-water separation in the vertical flow sedimentation tank 13 into the sludge tank 14.
The packing 20 includes an iron-carbon composite packing 21 disposed in the packing suspension device 126, and a spherical polyurethane packing 22. The iron-carbon composite filler 21 is prepared by uniformly mixing sponge iron, activated carbon and sulfur powder with a mass ratio of 3; mixing sponge iron, activated carbon and sulfur powder with the same mass ratio, putting the prepared particles into the mixture for vibration adhesion, and using the mixture after the coagulation stability reaches certain hardness. Corrosion of sponge iron in the iron-carbon composite filler 21H produced in the process 2 Can promote the denitrification process of the hydrogen autotrophic bacteria and simultaneously generate Fe by sponge iron corrosion 2+ In the oxidation to Fe 3+ And then promoting flocculation precipitation so as to remove ammonia nitrogen and total phosphorus. The denitrifying bacteria utilize organic carbon to perform heterotrophic denitrification and denitrification, and can utilize H when the carbon source is insufficient 2 (H produced by sponge iron during corrosion process 2 ) And elemental sulfur or sulfide (sulfur powder) to carry out autotrophic denitrification. H produced during sulfur autotrophic denitrification + Can promote the corrosion of the sponge iron and enhance the effect of flocculating, settling and dephosphorization. Micro-current is generated between the sponge iron and the activated carbon, so that the microbial activity can be promoted, and CO generated by the carbon anode 2 Can provide inorganic carbon source for autotrophy, and has lower demand on the carbon source. The three materials can better perform nitrogen and phosphorus removal under mutual promotion, and can effectively treat sewage with low carbon-nitrogen ratio. The polyurethane filler 22 and the iron-carbon composite filler 21 are uniformly distributed in the biochemical tank 12, and a biological film is formed on the surface of the iron-carbon composite material due to the difficulty and the difficulty in forming the biological film, so that the biological film is formed by film hanging of the spherical polyurethane filler, and the performance of the activated sludge is improved.
The artificial wetland 30 comprises a primary artificial wetland 31, an oxygenation tank 32 arranged behind the primary artificial wetland 31, a secondary artificial wetland 33 arranged behind the oxygenation tank 32, a clean water tank 34 arranged behind the secondary artificial wetland 33, and a plurality of connecting water holes 35 arranged on the wall of the tank. The first-stage artificial wetland 31 is connected with the vertical flow sedimentation tank 13 through a water pipe, a 3-10 cm-thick cobble layer, a 20 cm-thick 2-3 cm-thick multifunctional phosphorus removal ceramsite layer, a 15 cm-thick 1-2 cm-thick limestone layer, a 15 cm-thick 0.5-1 cm-thick activated zeolite layer, a 15 cm-thick 0.3-6 cm-thick volcanic rock layer and wetland plants planted on the surface of the tank are sequentially arranged in the tank from the bottom to the top of the tank. The second-stage artificial wetland 33 is sequentially provided with a cobble layer with the thickness of 25cm and the thickness of 3-10 cm, a multifunctional dephosphorization ceramsite layer with the thickness of 15cm and the thickness of 2-3 cm, an activated zeolite layer with the thickness of 20cm and the thickness of 0.5-1 cm, a coarse sand layer with the thickness of 15cm and the thickness of more than 0.5 cm, a vermiculite layer with the thickness of 15cm and the thickness of 0.3-6 cm and wetland plants planted on the surface of the pond. The water purification is completed through the first-stage artificial wetland 31 and the second-stage artificial wetland 33. And the first-stage artificial wetland 31 and the second-stage artificial wetland 33 are provided with an observation port 311 which is exposed out of the surface of the water tank and is used for observing the water flow condition in the water pipe and preventing impurities or blockage. The bottom of the first-stage artificial wetland 31, the oxygenation tank 32 and the second-stage artificial wetland 33 is provided with an emptying pipe 312, and the emptying pipe 312 enters from the tank wall of the first-stage artificial wetland 33 far away from the oxygenation tank 32 so as to send external air in. The aeration device 1251 is provided in each of the oxygenation tank 32 and the clean water tank 34 to increase the air content of the water. The water pipe between the secondary artificial wetland 33 and the clean water tank 34 passes through an ultraviolet sterilizing device 341 to eliminate bacteria in the water, and the ultraviolet sterilizing device 341 is a prior art and should be well known to those skilled in the art, and thus will not be described in detail herein. The connecting water hole 35 is arranged on the tank wall and close to the tank surface, the connecting water hole 35 at the water inlet end extends the water inlet to the tank bottom through a Z-shaped pipe, and the water outlet end is arranged on the tank top so as to ensure the purifying effect of the discharged supernatant.
Compared with the prior art, the utility model provides an use coupling microbiological method nitrogen and phosphorus removal processing system of iron carbon filler is through on traditional "anaerobism-oxygen deficiency-good oxygen" (A2/O) treatment process is the basis set up in the biochemical pond 12 the compound filler 21 of iron carbon and spherical polyurethane filler 22, through sponge iron, sulfur powder and the active carbon of adding in the compound filler 21 of iron carbon promote the growth of nitrobacteria, especially the addition sulfur autotrophic denitrification of sulfur powder has promoted sponge iron corrosion production H 2 And the nitrogen and phosphorus removal effect can be effectively improved, and the normal operation of the treatment facility is ensured to be stable and discharge to reach the standard. And the iron-carbon composite filler 21 is placed in the filler suspension device 126, so that the effective contact surface with domestic sewage can be improved, the treatment efficiency is improved, and the replacement of the filler can be facilitated.
The above description is only for the preferred embodiment of the present invention and should not be construed as limiting the scope of the present invention, and any modification, equivalent replacement or improvement within the spirit of the present invention is encompassed by the claims of the present invention.
Claims (9)
1. A coupled microorganism nitrogen and phosphorus removal treatment system using iron-carbon filler is characterized in that: use coupling microbiological method nitrogen and phosphorus removal processing system that indisputable carbon packed to include a nitrogen and phosphorus removal device, two kinds of settings are in filler in the nitrogen and phosphorus removal device, and a setting is in constructed wetland behind the nitrogen and phosphorus removal device, nitrogen and phosphorus removal device includes a biochemical pond, biochemical pond includes that a plurality of settings are in filler linkage in the biochemical pond, filler linkage includes a stainless steel support, one is located the activity buckle of stainless steel support one end to and a plurality of setting are in filler frame on the stainless steel support, the stock that the stainless steel support was made, activity buckle is one and is located the J type buckle of stainless steel tip, the filler frame separates each other and sets up on the stainless steel support, the frame body adopts hollow out construction, the filler includes that a setting is in the compound filler of indisputable carbon in the filler linkage to and a spherical polyurethane filler, the polyurethane filler with the compound equipartition of indisputable carbon is in the biochemical pond equally.
2. The coupled microorganism nitrogen and phosphorus removal treatment system using iron-carbon filler as claimed in claim 1, wherein: the nitrogen and phosphorus removal device also comprises a grid filter tank, a vertical flow sedimentation tank arranged behind the biochemical tank and a sludge tank arranged behind the vertical flow sedimentation tank, wherein a grid and a booster water pump are arranged in the grid filter tank.
3. The coupled microorganism nitrogen and phosphorus removal treatment system using iron-carbon filler as claimed in claim 2, wherein: the biochemical pool further comprises a first anaerobic pool arranged behind the grid filter pool, a second anaerobic pool arranged behind the first anaerobic pool, an anoxic pool arranged behind the second anaerobic pool, a first aerobic pool arranged behind the anoxic pool, and a second aerobic pool arranged behind the first aerobic pool, wherein the anoxic pool, the first aerobic pool and the second aerobic pool are all internally provided with an aeration device.
4. The coupled microorganism nitrogen and phosphorus removal treatment system using iron-carbon filler as claimed in claim 3, wherein: and a group of electrodes positioned on the wall of the second aerobic tank and a nitrifying liquid return channel communicated with the anoxic tank are arranged in the second aerobic tank, and the electrodes are a group of negative electrodes and positive electrodes.
5. The coupled microorganism nitrogen and phosphorus removal treatment system using iron-carbon filler as claimed in claim 3, wherein: the vertical flow sedimentation tank is internally provided with a guide cylinder connected with the biochemical tank, an overflow pipe connected with the artificial wetland connecting port, and a sludge return pipe connected with the first anaerobic tank, wherein the guide cylinder is arranged at the center of the top of the vertical flow sedimentation tank, the overflow pipe is arranged along the wall of the vertical flow sedimentation tank and is positioned near the top of the tank, and the sludge return pipe is arranged between the vertical flow sedimentation tank and the first anaerobic tank.
6. The coupled microorganism nitrogen and phosphorus removal treatment system using iron-carbon filler as claimed in claim 3, wherein: constructed wetland includes a one-level constructed wetland, and a setting is in oxygenate the pond behind the one-level constructed wetland, a setting is in oxygenate the second grade constructed wetland behind the pond, and a setting is in clean water basin behind the second grade constructed wetland, set up an observation port that exposes the pool face on one-level constructed wetland, second grade constructed wetland, the bottom of the pool of oxygenating pond, second grade constructed wetland sets up an evacuation pipe, the evacuation pipe is followed level constructed wetland keeps away from oxygenate the pool wall in pond and get into, oxygenate the pond with set up one in the clean water basin aeration equipment, second grade constructed wetland with water pipe between the clean water basin is through an ultraviolet disinfection equipment.
7. The system of claim 6, which comprises: the artificial wetland also comprises a plurality of connecting water holes arranged on the wall of the pool.
8. The coupled microbiological nitrogen and phosphorus removal treatment system using iron carbon packing of claim 6, wherein: the first-stage artificial wetland is connected with the vertical flow sedimentation tank through a water pipe, a cobble layer with the thickness of 25cm and the thickness of 3-10 cm, a multifunctional dephosphorization ceramsite layer with the thickness of 20cm and the thickness of 2-3 cm, a limestone layer with the thickness of 15cm and the thickness of 1-2 cm, an activated zeolite layer with the thickness of 15cm and the thickness of 0.5-1 cm, a volcanic rock layer with the thickness of 15cm and the thickness of 0.3-6 cm and wetland plants planted on the surface of the tank are sequentially arranged in the tank from the bottom to the top of the tank.
9. The system of claim 6, which comprises: the second-stage artificial wetland 33 is sequentially provided with a 3-10 cm cobble layer with the thickness of 25cm, a 2-3 cm multifunctional dephosphorization ceramsite layer with the thickness of 15cm, a 0.5-1 cm activation zeolite layer with the thickness of 20cm, a coarse sand layer with the thickness of 15cm and more than 0.5 cm, a 0.3-6 cm vermiculite layer with the thickness of 15cm and wetland plants planted on the surface of the pond from the bottom to the top of the pond.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202221974844.2U CN218403850U (en) | 2022-07-28 | 2022-07-28 | Coupling microbiological nitrogen and phosphorus removal treatment system using iron-carbon filler |
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| CN202221974844.2U CN218403850U (en) | 2022-07-28 | 2022-07-28 | Coupling microbiological nitrogen and phosphorus removal treatment system using iron-carbon filler |
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| CN202221974844.2U Active CN218403850U (en) | 2022-07-28 | 2022-07-28 | Coupling microbiological nitrogen and phosphorus removal treatment system using iron-carbon filler |
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