CN211595355U - Rural domestic sewage treatment system who contains biological trickling filter - Google Patents
Rural domestic sewage treatment system who contains biological trickling filter Download PDFInfo
- Publication number
- CN211595355U CN211595355U CN201922191888.2U CN201922191888U CN211595355U CN 211595355 U CN211595355 U CN 211595355U CN 201922191888 U CN201922191888 U CN 201922191888U CN 211595355 U CN211595355 U CN 211595355U
- Authority
- CN
- China
- Prior art keywords
- water
- filter
- water distribution
- layer
- trickling filter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Biological Treatment Of Waste Water (AREA)
- Purification Treatments By Anaerobic Or Anaerobic And Aerobic Bacteria Or Animals (AREA)
Abstract
The utility model discloses a rural domestic sewage treatment system containing a biological trickling filter, which comprises a biological trickling filter, wherein the biological trickling filter is a square cavity with an opening at the top, the biological trickling filter comprises a water distribution area and a filter material layer positioned below the water distribution area, and the filter material layer is positioned in the cavity of the biological trickling filter; the water distribution area comprises water distribution pipes and water distributors positioned below the water distribution pipes, the water distribution pipes are connected with the water inlet pipe, and the water distributors comprise an upper layer of water distributors and a lower layer of water distributors; air layers are arranged at the middle part and the lower part of the filter material layer. The utility model discloses a set up two kinds of forms of air intermediate layer and drop aeration and effectively improved the oxygenation effect of sewage in the bio-trickling filter in the filter material layer, alleviated current bio-trickling filter bad ventilation's problem on the basis of keeping current bio-trickling filter advantage, reinforcing bio-trickling filter's carbon oxidation and ammoxidation to improve the ammonia nitrogen treatment effect in good oxygen bio-trickling filter.
Description
Technical Field
The utility model relates to a rural domestic sewage treatment system who contains biological trickling filter belongs to sewage treatment technical field.
Background
Along with the rapid development of rural economy, the living standard of people is continuously raised, and the water quantity and the complexity of components of rural domestic sewage are improved. Under the background, the unreasonable discharge phenomenon of the rural domestic sewage can directly cause pollution to the environment on one hand, is not beneficial to the ecological balance of the rural environment, and on the other hand, the polluted environment can generate great threat to the health of human beings.
Rural domestic sewage mainly comes from washing sewage, kitchen sewage, lavatory sewage and other sewage, and because the composition characteristics and the water yield of different types of sewage are very different, the quality of water of rural domestic sewage is unstable, can show different water quality characteristics in different periods of time. On the whole, the rural domestic sewage has more organic matters, nitrogen, phosphorus and other nutrient elements and better biodegradability. Meanwhile, the rural domestic sewage discharge has the characteristics of small water quantity, wide dispersion range, intermittent discharge, large instantaneous change amplitude and the like.
Biological trickling filters are a common sewage treatment process and have been used for many years. The equipment takes plastic or inert mineral material as a reactor of microorganism adhesion growth medium, sewage is sprayed from the top of a tower provided with a water distribution system, flows through a filter material in a trickling filtration state, degrades organic matters in a microbial membrane, and performs nitrification and denitrification. The trickling filter has large gas-liquid contact surface area and low operation cost, and can bear high load and high toxicity. The conventional reoxygenation method of the trickling filter is natural ventilation or forced ventilation. The traditional oxygen enrichment mode is difficult to ensure the sufficient oxygen supply in the whole system, and the good ammonia nitrogen treatment effect can not be realized.
SUMMERY OF THE UTILITY MODEL
Utility model purpose: the utility model aims to solve the technical problem that a rural domestic sewage treatment system who contains biological trickling filter is provided, this system improves biological trickling filter to effectively improved the oxygen supply volume of biological trickling filter, strengthened biological trickling filter's ammonia nitrogen treatment effect.
The utility model has the following contents: the utility model discloses a technical means do:
a rural domestic sewage treatment system containing a biological trickling filter comprises the biological trickling filter, wherein the biological trickling filter is a square cavity with an opening at the top, the biological trickling filter comprises a water distribution area and a filter material layer, the filter material layer is positioned in the cavity of the biological trickling filter, and the water distribution area is positioned above the filter material layer; the water distribution area comprises water distribution pipes and water distributors positioned below the water distribution pipes, the water distribution pipes are connected with the water inlet pipe, and the water distributors comprise an upper layer of water distributors and a lower layer of water distributors; air layers are arranged at the middle part and the lower part of the filter material layer.
Wherein, the lower part of the filter material layer is a water collecting area, part of the water discharged from the water collecting area is discharged into the subsurface flow type artificial wetland through a pipeline, part of the water flows back to the front end of the anoxic tank through the pipeline, and the other part of the water flows back to the rear end of the anoxic tank through the pipeline.
The rural domestic sewage treatment system further comprises a grid well, a water collecting tank, an anoxic tank and a subsurface flow type artificial wetland, wherein a water inlet of the grid well is connected with an external sewage discharge pipeline, a water outlet of the grid well is connected with a water inlet of the water collecting tank, a water outlet of the water collecting tank is connected with a water inlet of the anoxic tank, sewage treated by the anoxic tank is lifted to a water inlet pipe of the biological trickling filter by a water inlet pump, one part of sewage treated by the biological trickling filter enters the subsurface flow type artificial wetland, one part of sewage flows back to the front end of the anoxic tank through a pipeline, and the other part of sewage flows back to the rear end of the anoxic tank through a.
Wherein, square cavity top is equipped with the apron, and the water distribution position is located apron below, is equipped with wind hole and ventilation hole I respectively on the wall body (wall body middle part) all around of square cavity, is equipped with access hole and ventilation hole II on the apron.
Wherein, the direction of the opening of the wind poking hole is inclined upwards by 45 degrees.
Wherein, the water inlet pipe is provided with a rotameter and a pressure release valve.
The water distribution pipe is in a shape of Chinese character 'wang', and consists of a main water distribution pipe and a plurality of branch water distribution pipes which are vertical to the main water distribution pipe, the branch water distribution pipes are evenly distributed along the extension direction of the main water distribution pipe, and a plurality of water distribution holes which are inclined downwards by 45 degrees are arranged on the pipe surface of the water distribution pipe opposite to the water distributor. After being lifted to the water distribution pipe, the sewage falls onto a water distributor below the water distribution pipe through the water distribution holes.
Wherein the water distributor is square, and a plurality of water permeable holes are uniformly formed on the water distributor; the water permeable holes of the upper water distributor and the lower water distributor are staggered, so that the situation that the inlet water directly drops to the filter material layer without passing through the second water distributor is avoided, and the sewage from the upper water distributor and the lower water distributor uniformly drops to the lower filter material layer. The water distributor and the water distributor jointly form a water distribution drop oxygenation system, a certain interval is reserved between the lower water distributor and the filter material layer, sewage to be treated is distributed to the water distributor through the water distributor and then distributed to the filter material layer through the water distributor, two-time drop aeration is completed, and the oxygenation effect of the sewage is improved through the two-time drop aeration of the water distribution system.
Wherein the filter material layer comprises a ceramsite layer I with the particle size of 30-50 mm, a ceramsite layer II with the particle size of 5-15 mm and a ceramsite layer III with the particle size of 5-15 mm; the heights of the ceramsite layer I and the ceramsite layer II are 0.5m, and the height of the ceramsite layer III is 1 m; an air layer I is arranged between the ceramsite layer II and the ceramsite layer III, an air layer II is arranged below the ceramsite layer III, and the thicknesses of the air layer I and the air layer II are both 0.2 m. Through set up the air bed simultaneously in the middle part and the lower part on the filter material layer, realized carrying out the aeration simultaneously in filter material layer middle part and below to improve the ventilation effect on filter material layer, compared with traditional biological trickling filter, alleviated the problem that the filter material blockked up and the problem of oxygenating inadequately greatly.
Has the advantages that: the utility model discloses biological trickling filter has effectively improved the oxygenation effect of sewage in the biological trickling filter through set up air intermediate layer and drop two kinds of forms of aeration in the filtering material layer, has alleviated the problem that current biological trickling filter ventilation is bad and the filter material easily blocks up on the basis of keeping current biological trickling filter advantage, has strengthened biological trickling filter's carbon oxidation and ammoxidation to the ammonia nitrogen and the organic matter treatment effect in aerobic biological trickling filter have effectively been improved.
Drawings
FIG. 1 is a process flow diagram of the rural domestic sewage treatment system of the utility model;
FIG. 2 is a schematic structural view of a bio-trickling filter in the rural domestic sewage treatment system of the present invention;
FIG. 3 is a bottom view of the water distributor;
FIG. 4 is a schematic structural diagram of an upper water distributor;
FIG. 5 is a side view of a two-layer water distributor;
fig. 6 is a bottom view of the water distribution branch pipe.
Detailed Description
The technical solution of the present invention will be further explained with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the utility model discloses rural domestic sewage treatment system who contains biological trickling filter, including grid well 21, water collecting tank 22, oxygen deficiency pond 23, biological trickling filter 24 and undercurrent formula constructed wetland 25, grid well 21 water inlet is passed through the pipeline and is connected with outside sewage discharging source, grid well 21 delivery port is connected with water collecting tank 22 water inlet, water collecting tank 22 delivery port is connected with oxygen deficiency pond 23 water inlet, sewage after 23 handles of oxygen deficiency pond is promoted to the inlet tube 6 of biological trickling filter 24 by the intake pump, partly entering undercurrent formula constructed wetland 25 of sewage after 24 handles of biological trickling filter, partly through the pipeline backward flow to 23 front ends of oxygen deficiency pond, partly backward flow to 23 rear ends of oxygen deficiency pond through the pipeline in addition.
The anoxic tank 23 realizes anoxic denitrification treatment on sewage, three partition plates are arranged in the anoxic tank 23, the anoxic tank 23 is divided into four compartments through the three partition plates, namely a first compartment, a second compartment, a third compartment and a fourth compartment, and through holes for communicating two adjacent compartments are formed in the three partition plates; each compartment is filled with a suspension ball biological filler, the diameter of the biological filler is 80mm, and the stacking volume of the biological filler accounts for 30 percent of the effective volume of the anoxic tank. The sewage treated by the anoxic tank 23 is lifted to the biological trickling filter by a lift pump.
The biological trickling filter 24 is used for realizing the biological trickling filter treatment to sewage, a part of sewage after the biological trickling filter treatment is discharged into the subsurface constructed wetland 25 through the pipeline, a part of sewage flows back to the front end of the anoxic tank 23 through the pipeline, the sewage flows back to the front end of the anoxic tank 23 to ensure that the sewage after ammoxidation is subjected to denitrification nitrogen removal through the anoxic tank 23, thereby further improving the nitrogen removal effect of the system, a part of sewage flows back to the rear end of the anoxic tank 23 through the pipeline, and the sewage flows back to the rear end of the anoxic tank 23 to increase the flow of the sewage entering the biological trickling filter, thereby ensuring that the sewage is not easy to block.
The subsurface flow type artificial wetland 25 is used for realizing the purification treatment of the sewage, and the sewage treated by the subsurface flow type artificial wetland 25 is discharged after reaching the standard through a pipeline.
As shown in fig. 2-3, the bio-trickling filter 24 of the rural domestic sewage treatment system of the present invention is a square cavity 1 with an open top, the bio-trickling filter 24 includes a water distribution region and a filter material layer, the filter material layer is located in the bio-trickling filter cavity 1, and the water distribution region is located above the filter material layer; the water distribution area comprises water distribution pipes 3 and water distributors 4 positioned below the water distribution pipes 3, the water distribution pipes 3 are connected with a water inlet pipe 6, each water distributor 4 comprises an upper water distributor 26 and a lower water distributor 27, which are respectively an upper water distributor 26 and a lower water distributor 27 (the upper water distributor 26 and the lower water distributor 27 are both fixed on the biological trickling filter cavity 1), a certain interval is reserved between each water distribution pipe 3 and the upper water distributor 26, a certain interval is reserved between the upper water distributor and the lower water distributor, and a certain interval is reserved between the lower water distributor 27 and a filter material layer, so that water distribution drop oxygenation for two times is realized; air layers are arranged at the middle part and the lower part of the filter material layer. The sewage sequentially passes through the water distribution area, the ceramsite layer I12, the ceramsite layer II13, the air layer I14, the ceramsite layer III16 and the air layer II15, and finally passes through the water collection area 17 to be discharged. A water collecting area 17 is arranged below the filter material layer, part of the effluent of the water collecting area 17 is discharged into the subsurface flow type artificial wetland 25 through a pipeline, part of the effluent flows back to the front end of the anoxic tank 23 through the pipeline, and the other part of the effluent flows back to the rear end of the anoxic tank 23 through the pipeline.
The wall body of the square cavity 1 is of a reinforced concrete structure, the thickness of the wall body is 240mm, and each wall is provided with 4 wind distributing holes 8 and 4 vent holes I9; the square cavity 1 is provided with a cover plate 2 above, the water distribution area is positioned below the cover plate 2, the cover plate 2 is provided with an access hole 11 and a vent hole II10, and the opening direction of the air distributing hole 8 is 45 degrees upwards in an inclined mode. The opening direction of the wind poking holes 8 is inclined upwards by 45 degrees, so that the filler is not easy to overflow, and meanwhile, the sewage is not easy to spill.
The top of the biological trickling filtration tank 24 is provided with a water distribution and drop oxygenation system, the inlet water of the biological trickling filtration tank comes from rural domestic sewage treated by the anoxic tank 23, the inlet water enters the water distribution pipe 3 from the water inlet pipe 6 through the water inlet pump, and the water inlet pipe 6 is provided with a rotor flow meter 5 and a pressure release valve 7.
As shown in fig. 6, the water distribution pipe 3 is in a shape of an inverted V, the water distribution pipe 3 is composed of a main water distribution pipe 18 and a plurality of branch water distribution pipes 20 perpendicular to the main water distribution pipe 18, a water inlet of the main water distribution pipe 18 is connected with the water inlet pipe 6, the branch water distribution pipes 20 are uniformly distributed along the extension direction of the main water distribution pipe 18, a plurality of water distribution holes 30 inclined downward by 45 degrees are formed in the pipe surface of the water distribution pipe 3 opposite to the water distributor 4, and the water distribution holes 30 are inclined downward by 45 degrees to improve the water distribution uniformity and the water distribution uniformity when the water distribution holes are sprinkled, so that the oxygenation effect is improved. After being lifted to the water distribution pipes 3, the sewage falls to the water distributors 4 below the water distribution pipes 3 through the water distribution holes 30.
As shown in fig. 4-5, the water distributor 4 is square, and a plurality of water permeable holes 19 are uniformly formed on the water distributor 4; the water permeable holes of the upper water distributor 4 and the lower water distributor 4 are staggered, so that the situation that the inlet water directly drops to the filter material layer without passing through the second water distributor (the lower water distributor 27) is avoided, and the sewage from the upper water distributor 3 uniformly drops to the lower filter material layer through the upper water distributor 4 and the lower water distributor 4. The water distributor 3 and the water distributor 4 jointly form a water distribution drop oxygenation system, a certain interval is reserved between the lower water distributor 27 and a filter material layer (above the ceramsite layer I12), sewage to be treated is distributed to the water distributor 4 through the water distributor 3 and then distributed to the filter material layer through the water distributor 4, two times of drop aeration is completed, and the oxygenation effect of the sewage is improved through the two times of drop aeration of the water distribution system.
The filter material layer comprises a ceramsite layer I12 with the particle size of 30-50 mm, a ceramsite layer II13 with the particle size of 5-15 mm and a ceramsite layer III16 with the particle size of 5-15 mm; the heights of the ceramsite layer I12 and the ceramsite layer II13 are 0.5m, and the height of the ceramsite layer III16 is 1 m; an air layer I14 is arranged between the ceramsite layer II13 and the ceramsite layer III16, an air layer II15 is arranged below the ceramsite layer III16, and the thicknesses of the air layer 114 and the air layer II15 are both 0.2 m. Through set up the air bed simultaneously in the middle part and the lower part on the filter material layer, realized carrying out the layering aeration in filter material layer middle part and below to improve the ventilation effect on filter material layer, compared with traditional biological trickling filter, alleviated the problem that the filter material blockked up greatly. The sewage is subjected to ammonia oxidation and carbon oxidation in the filter material layer, and the sewage treated by the filter material is collected in the water collecting area 17 and waits for entering the next treatment unit. An air layer 114 is additionally arranged between the ceramsite layer II13 and the ceramsite layer III16, so that the dissolved oxygen content in the trickling filter can be greatly improved, and the biochemical reaction oxygen deficiency in the trickling filter is effectively prevented.
Rural domestic sewage COD treated by the rural domestic sewage treatment system containing the biological trickling filter of the utility modelcrAbout 85% BOD can be removed5Removal of 90% NH385% of N, 70% of total nitrogen, 60% of total phosphorus and 80% of solid suspended substances.
Under the condition of no manual forced oxygenation, the problems of filler blockage and insufficient oxygenation easily occur after the biological trickling filter without an air interlayer operates for 3-6 months, so that the sewage treatment effect is reduced; the utility model discloses a biological trickling filter contains the air interlayer and carries out drop aeration twice, still does not take place to pack and blocks up the problem after the operation one year to can guarantee good oxygenation, still have good ammoxidation treatment effect.
Claims (9)
1. A rural domestic sewage treatment system containing a biological trickling filter is characterized in that: the biological trickling filter comprises a biological trickling filter, a filter and a filter, wherein the biological trickling filter is a square cavity with an opening at the top, and comprises a water distribution area and a filter layer positioned below the water distribution area, and the filter layer is positioned in the cavity of the biological trickling filter; the water distribution area comprises water distribution pipes and water distributors positioned below the water distribution pipes, the water distribution pipes are connected with the water inlet pipe, and the water distributors comprise an upper layer of water distributors and a lower layer of water distributors; air layers are arranged at the middle part and the lower part of the filter material layer.
2. The biotrickling filter-containing rural domestic sewage treatment system of claim 1, wherein: and a water collecting area is arranged below the filter material layer, part of the effluent of the water collecting area is discharged into the subsurface flow type artificial wetland through a pipeline, part of the effluent flows back to the front end of the anoxic tank through the pipeline, and the other part of the effluent flows back to the rear end of the anoxic tank through the pipeline.
3. The biotrickling filter-containing rural domestic sewage treatment system of claim 1, wherein: rural domestic sewage treatment system still includes grid well, catch basin, oxygen deficiency pond and undercurrent formula constructed wetland, grid well water inlet and outside domestic sewage discharge tube coupling, the grid well delivery port is connected with the catch basin water inlet, the catch basin delivery port is connected with the oxygen deficiency pond water inlet, sewage after the oxygen deficiency pond is handled is promoted to the inlet tube of biological trickling filter by the intake pump, during the sewage part of biological trickling filter after handling gets into the undercurrent formula constructed wetland, partly flows back to the oxygen deficiency pond front end through the pipeline, still partly flows back to the oxygen deficiency pond rear end through the pipeline.
4. The biotrickling filter-containing rural domestic sewage treatment system of claim 1, wherein: the square cavity is provided with a cover plate above, the water distribution area is positioned below the cover plate, the peripheral wall of the square cavity is respectively provided with a wind poking hole and a vent hole I, and the cover plate is provided with an access hole and a vent hole II.
5. The biotrickling filter-containing rural domestic sewage treatment system of claim 4, wherein: the opening direction of the wind poking holes is 45 degrees obliquely upwards.
6. The biotrickling filter-containing rural domestic sewage treatment system of claim 1, wherein: and the water inlet pipe is provided with a rotor flow meter and a pressure release valve.
7. The biotrickling filter-containing rural domestic sewage treatment system of claim 1, wherein: the water distribution pipe is in a shape of Chinese character 'wang', and consists of a main water distribution pipe and a plurality of branch water distribution pipes which are vertical to the main water distribution pipe, the branch water distribution pipes are evenly distributed along the extension direction of the main water distribution pipe, and a plurality of water distribution holes which are inclined downwards by 45 degrees are arranged on the pipe surface of the water distribution pipe opposite to the water distributor.
8. The biotrickling filter-containing rural domestic sewage treatment system of claim 1, wherein: the water distributor is square, and a plurality of water permeable holes are uniformly formed in the water distributor; the water permeable holes of the upper water distributor and the lower water distributor are staggered.
9. The biotrickling filter-containing rural domestic sewage treatment system of claim 1, wherein: the filter material layer comprises a ceramsite layer I with the particle size of 30-50 mm, a ceramsite layer II with the particle size of 5-15 mm and a ceramsite layer III with the particle size of 5-15 mm; the heights of the ceramsite layer I and the ceramsite layer II are 0.5m, and the height of the ceramsite layer III is 1 m; an air layer I is arranged between the ceramsite layer II and the ceramsite layer III, an air layer II is arranged below the ceramsite layer III, and the thicknesses of the air layer I and the air layer II are both 0.2 m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922191888.2U CN211595355U (en) | 2019-12-09 | 2019-12-09 | Rural domestic sewage treatment system who contains biological trickling filter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922191888.2U CN211595355U (en) | 2019-12-09 | 2019-12-09 | Rural domestic sewage treatment system who contains biological trickling filter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN211595355U true CN211595355U (en) | 2020-09-29 |
Family
ID=72591421
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201922191888.2U Active CN211595355U (en) | 2019-12-09 | 2019-12-09 | Rural domestic sewage treatment system who contains biological trickling filter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211595355U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111018240A (en) * | 2019-12-09 | 2020-04-17 | 南京路通工程科技有限公司 | Rural domestic sewage treatment system who contains biological trickling filter |
| CN117003378A (en) * | 2023-09-15 | 2023-11-07 | 国合绿能生态(无锡)有限公司 | Reciprocating type drop oxygenation biological filter of reciprocating type |
-
2019
- 2019-12-09 CN CN201922191888.2U patent/CN211595355U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111018240A (en) * | 2019-12-09 | 2020-04-17 | 南京路通工程科技有限公司 | Rural domestic sewage treatment system who contains biological trickling filter |
| CN117003378A (en) * | 2023-09-15 | 2023-11-07 | 国合绿能生态(无锡)有限公司 | Reciprocating type drop oxygenation biological filter of reciprocating type |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108503136B (en) | River channel treatment system | |
| CN105753166B (en) | Horizontal drowned flow-two-stage oxygenation vertical subsurface flow wetland sewage disposal system and method | |
| CN111018240A (en) | Rural domestic sewage treatment system who contains biological trickling filter | |
| CN211595355U (en) | Rural domestic sewage treatment system who contains biological trickling filter | |
| CN100486922C (en) | Integral sputtering-oxygenating-biofiltering waste water purifying apparatus and process | |
| CN210117318U (en) | Intelligent deep water treatment integrated system | |
| CN209872675U (en) | Rural small-size domestic sewage is collected, is handled, retrieval and utilization integration system | |
| CN210764843U (en) | Rural sewage treatment plant | |
| CN208802968U (en) | A kind of modified form rural domestic sewage treatment system | |
| CN106882904A (en) | A kind of easy device and method of integrated treatment domestic sewage in rural areas | |
| CN206570169U (en) | Water body in lake in-situ purification system | |
| CN202116375U (en) | Aeration biofilter for domestic sewage | |
| CN214990962U (en) | Utilize dry land reed to handle sewage plant | |
| CN108439598A (en) | Integrated sewage treating apparatus | |
| CN209815907U (en) | Filler ecological wetland for water purification | |
| CN209974528U (en) | Biological filter reactor for treating eutrophic river water | |
| CN210595462U (en) | Double-chamber artificial rapid infiltration sewage purification system | |
| CN211712873U (en) | Artificial wetland purification system for treating rural domestic sewage | |
| CN208776535U (en) | A kind of domestic sewage in rural areas integrated equipment for wastewater treatment | |
| CN209602322U (en) | Sewage-treatment plant | |
| CN112142260A (en) | Treatment system and method for decentralized sewage | |
| CN217479282U (en) | Sewage treatment equipment for resource utilization of rural domestic sewage | |
| CN216005539U (en) | Two-point water inlet enhanced nitrogen and phosphorus removal sewage treatment system | |
| CN213537470U (en) | Equipment for rural sewage treatment and resource utilization | |
| CN213623477U (en) | Unpowered strengthening treatment device suitable for rural domestic sewage |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |