CN203866150U - Compound constructed wetland treatment system - Google Patents
Compound constructed wetland treatment system Download PDFInfo
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- CN203866150U CN203866150U CN201420181307.1U CN201420181307U CN203866150U CN 203866150 U CN203866150 U CN 203866150U CN 201420181307 U CN201420181307 U CN 201420181307U CN 203866150 U CN203866150 U CN 203866150U
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Abstract
The utility model discloses a compound constructed wetland treatment system, which comprises a vertical flow constructed wetland treatment pond and a subsurface flow constructed wetland treatment pond which are connected in series, wherein the vertical flow constructed wetland treatment pond is arranged at the water inlet end of the system, and the subsurface flow constructed wetland treatment pond is arranged at the water outlet end of the system; the system further comprises a water distribution box; guide walls are arranged in the water distribution box; the water distribution box is positioned at the water inlet end of the system; the water outlet of the water distribution box is communicated with the water inlet pipe of the vertical flow constructed wetland treatment pond; fillers in the vertical flow constructed wetland treatment pond sequentially comprise a coarse particle size filler layer, a middle particle size filler layer and a fine particle size filler layer from bottom to top; a drainage outlet is formed in the subsurface flow constructed wetland treatment pond; the fillers in the subsurface flow constructed wetland treatment pond sequentially comprise a coarse filler layer, a middle filler layer and a coarse filler layer from left to right and a fine filler layer is arranged above the coarse filler layers and the middle filler layer. The compound constructed wetland treatment system is better in total phosphorus removal effect, and the alkalinity of the pH value of discharged water is low, and the pH value is about 7-9.
Description
Technical field
The utility model relates to technical field of sewage, is specifically related to a kind of composite type artificial wetland treatment system taking potassium felspar sand as filler.
Background technology
Treatment effect is good because having for Artificial Wetland Techniques in sewage disposal, construction and working cost low, be easy to the advantages such as maintenance management, be subject to the generally attention of countries in the world.In recent years, artificial swamp basis has obtained development faster as a kind of New Technology about Wastewater Treatment, and is widely used.
Artificial swamp by matrix (filler) hold back, filter, absorption and biological degradation complete jointly.Traditional artificial swamp in use can exist the waterpower discrepancy in elevation large, SS(Suspended Solid, the suspended substance in sewage) load high, ammonia nitrogen and total poor problem of tp removal rate.Trace it to its cause is mainly the design of artificial swamp and the use of filler.In order to improve processing power and the nitrogen phosphorus removal effect of artificial swamp, from the viewpoint of Design of Constructed Wetland, conventionally vertical current constructed wetland and drowned flow artificial wet land can be combined to form to combined artificial wetland.But the structure of existing composite artificial wet land treating system is optimized not, the grating of matrix fill is not ideal enough, higher through system water outlet pH after treatment value alkalescence.
Utility model content
The technical problems to be solved in the utility model is to provide a kind of composition optimizes, composite type artificial wetland treatment system taking potassium felspar sand as filler.The total phosphorus removal effect of this artificial wet land treating system is better, and the pH value of water outlet alkalescence is low, is about 7～9.
Composite type artificial wetland treatment system described in the utility model, comprises vertical current constructed wetland treating pond and the drowned flow artificial wet land treating pond of mutual series connection, wherein:
Described vertical current constructed wetland treating pond is arranged at the feed-water end of system, drowned flow artificial wet land treating pond is arranged at the water side of system, this system also comprises a distribution reservoir, distribution reservoir has a water-in and a water outlet, training wall is set in distribution reservoir, this distribution reservoir is positioned at the feed-water end of system, and its water outlet is communicated with the water inlet of vertical current constructed wetland treating pond;
Filler in described vertical current constructed wetland treating pond is followed successively by coarse grain footpath packing layer, middle particle diameter packing layer and fine grain size packing layer from the bottom to top, wherein, the filler of coarse grain footpath packing layer is that particle diameter is the potassium felspar sand of 40～60mm, the filler of middle particle diameter packing layer is that particle diameter is the potassium felspar sand of 20～40mm, and the filler of fine grain size packing layer is that particle diameter is the combination of potassium felspar sand and the quartz sand that particle diameter is 2～6mm of 5～10mm;
Described drowned flow artificial wet land treating pond is provided with water port, filler in this drowned flow artificial wet land treating pond is followed successively by coarse fodder layer, the middle bed of material and coarse fodder layer from left to right, above these three kinds of packing layers, be also provided with one deck fines layer, wherein, the filler of coarse fodder layer is that particle diameter is the potassium felspar sand of 40～60mm, the filler of the middle bed of material is that particle diameter is the potassium felspar sand of 20～40mm, and the filler of fines layer is that particle diameter is the combination of potassium felspar sand and the quartz sand that particle diameter is 2～6mm of 5～10mm.
In technique scheme, between the wet pond treating pond of described perpendicular flow artificial and the wet pond of drowned flow artificial treating pond, there is solid wall interval, the wet pond treating pond of described perpendicular flow artificial and the wet pond of drowned flow artificial treating pond can be that rectangular parallelepiped or other are not planned shape, preferably be cuboid, more preferably the long-width ratio of artificial swamp treating pond is more than or equal to 2:1.In described vertical current constructed wetland treating pond, be also provided with water distributor A, header A and air communication pipe, wherein, one end of header A is communicated with air communication pipe, and the other end is communicated with the water distributor B in drowned flow artificial wet land treating pond.Preferably, water distributor A is arranged to the top of vertical current constructed wetland treating pond, header A is arranged to the middle and lower part of vertical current constructed wetland treating pond; More preferably, be that water distributor A is arranged in the fine grain size filler in vertical current constructed wetland treating pond, header A is arranged in the coarse grain footpath packing layer in vertical current constructed wetland treating pond.Preferably, water distributor B is arranged to the middle and lower part of the coarse fodder layer of drowned flow artificial wet land treating pond high order end, water port is preferably disposed on the top of the wet pond of drowned flow artificial treating pond; More preferably, be that water distributor B is arranged to the position near bottom in the coarse fodder layer of drowned flow artificial wet land treating pond high order end, water port is arranged in the fines layer in the treating pond of the wet pond of drowned flow artificial; In drowned flow artificial wet land treating pond, be also provided with the header B for collecting treated water, this header B is arranged in the coarse fodder layer of low order end, and one end of this header B is communicated with water port.In the application, vertical current constructed wetland preferably adopts a low hydraulic pressure automatic rotation water distribution of raising.Described header A preferably adopts the form of supervisor both sides branch-line pipe, and each branch-line pipe is perforated pipe, and each branch-line pipe and supervisor's distribution is preferably " rich " font, for reoxygenation, collects water simultaneously and imports supervisor; Because one end of supervisor is communicated with blast main, the solid wall of the other end through the wet pond treating pond of perpendicular flow artificial and the wet pond of drowned flow artificial treating pond is communicated with the water distributor B in the treating pond of the wet pond of drowned flow artificial, thereby realize the layer that catchments of the wet pond of perpendicular flow artificial treating pond, the water distribution layer of the wet pond of drowned flow artificial treating pond is all communicated with atmosphere, effectively supplementary set oxygen, makes whole system form different dissolved oxygen gradients.Described header B adopts the form of supervisor both sides branch-line pipe equally, each branch-line pipe is perforated pipe, each branch-line pipe and supervisor's distribution is preferably " T " font, be conducive to collect the water after middle bed of material dephosphorization, wherein supervisor is communicated with water port, and the water of the process system processing of collecting is discharged by water port.In the packing layer of the superiors of the wet pond treating pond of perpendicular flow artificial and the wet pond of drowned flow artificial treating pond, all plant and have emergent, floristics can be selected according to local climate feature, preferably plant again the local waterplant such as power flower, Lu Di, can plant one or more miscegenations, spacing is no more than 9 strains with every square metre and is advisable.
In technique scheme, in the media assemblage of the fine grain size packing layer of the wet pond of described perpendicular flow artificial treating pond, the weight ratio of the quartz sand that the potassium felspar sand that particle diameter is 5～10mm and particle diameter are 2～6mm can be any proportioning, is preferably 50～70:30～50; In the media assemblage of the fines layer of the wet pond of described drowned flow artificial treating pond, the weight ratio of the quartz sand that the potassium felspar sand that particle diameter is 5～10mm and particle diameter are 2～6mm can be any proportioning, is preferably 50～70:30～50.
In technique scheme, in vertical current constructed wetland treating pond, the height of coarse grain footpath packing layer is preferably 200～250mm, and the height of middle particle diameter packing layer is preferably 400～500mm, and the height of fine grain size packing layer is preferably 100～150mm; More preferably the height of coarse grain footpath packing layer is 200mm, and the height of middle particle diameter packing layer is 450mm, and the height of fine grain size packing layer is 180mm.In drowned flow artificial wet land treating pond, the distance that coarse fodder layer is crossed over is from left to right preferably 250～350mm; Described coarse fodder layer, the middle bed of material are identical with the height of coarse fodder layer, are 600～750mm, and the height of described fines layer is preferably 100～150mm; More preferably the distance that coarse fodder layer is crossed over is from left to right 300mm; Described coarse fodder layer, the middle bed of material are identical with the height of coarse fodder layer, are 650mm, and the height of described fines layer is preferably 180mm.
In technique scheme, described water distributing pipe preferably also has a sewage draining exit, can be by the from then on mouthful discharge of the mud of deposition.Conventional training wall (being generally a flow deflector) in training wall prior art in described water distributing pipe, when mounted, preferably the bottom face of training wall and the plane at place, distribution reservoir bottom surface form the angle (being generally the angle of 60～70 °) that is greater than 60 °.The water-in of described distribution reservoir and the pipeline communication of carrying sanitary sewage.
Compared with prior art, feature of the present utility model is:
1, add distribution reservoir, the SS that makes sewage enter artificial swamp reduces, and avoids the filler blockage problem that causes because of SS, can effectively extend wetland work-ing life;
2, air communication pipe is set in vertical current constructed wetland treating pond, can improves oxygen in water, improve the clearance of COD and total nitrogen;
3, the combination of vertical current constructed wetland treating pond and drowned flow artificial wet land treating pond has solved the deficiencies such as waterpower drop that traditional simple vertical current constructed wetland and drowned flow artificial wet land exist is large, and convenient management, is particularly suitable for knob to be widely used;
4, adopt potassium felspar sand as filler, because potassium felspar sand is frame shape structure, can form more room, reach and inhale the high object of phosphorus efficiency; In addition, potassium felspar sand specific surface area is large, and for microorganic adhesion provides good growth interface, in potassium felspar sand, contained potassium element also helps the growth of plant, effectively promotes the absorption of plant to nitrogen.
Brief description of the drawings
Fig. 1 is the structural representation of a kind of embodiment of composite type artificial wetland treatment system described in the utility model;
Number in the figure is: 1 distribution reservoir; 11 water-ins; 12 sewage draining exits; 13 water outlets; 14 training walls; 2 vertical current constructed wetland treating ponds; 21 coarse grain footpath packing layers; Particle diameter packing layer in 22; 23 fine grain size packing layers; 24 water inlet pipes; 25 water distributor A; 26 header A; 27 air communication pipes; 3 drowned flow artificial wet land treating ponds; 31 coarse fodder layers; The bed of material in 32; 33 fines layers; 34 water port; 35 water distributor B; 36 header B; 4 emergents.
Embodiment
As shown in Figure 1, composite type artificial wetland treatment system described in the utility model is mainly by distribution reservoir 1, vertical current constructed wetland treating pond 2 and drowned flow artificial wet land treating pond 3 form, between the wet pond treating pond of described perpendicular flow artificial and the wet pond of drowned flow artificial treating pond, there is solid wall interval, vertical current constructed wetland treating pond 2 and drowned flow artificial wet land treating pond 3 are cascaded structure, it (is composite type artificial wetland treatment system described in the utility model that described vertical current constructed wetland treating pond 2 is arranged at system, feed-water end down together), drowned flow artificial wet land treating pond 3 is arranged at the water side of system, distribution reservoir 1 is also positioned at the feed-water end of system, its water outlet becomes the water inlet of vertical current constructed wetland treating pond 2, wherein:
Distribution reservoir 1 has a water-in 11, a water outlet 13 and a sewage draining exit 12, the described water that enters water-in 11 is the sewage after front end anaerobic treatment, the water outlet 13 of distribution reservoir 1 is communicated with the water inlet pipe 24 of vertical current constructed wetland treating pond 2, and described sewage draining exit 12 is for the discharge of mud; In distribution reservoir 1, be provided with training wall 14, the plane at the bottom face of preferred mounted training wall 14 and distribution reservoir 1 place, bottom surface forms the angle (being generally the angle of 60～70 °) that is greater than 60 °;
In described vertical current constructed wetland treating pond 2, be filled with filler, filler is by upper, in, lower three layers of formation, filler is followed successively by coarse grain footpath packing layer 21 (layer catchments) from the bottom to top, middle particle diameter packing layer 22 (dephosphorization layer) and fine grain size packing layer 23 (plant growing layer and water distribution layer), wherein, the filler of coarse grain footpath packing layer 21 is that particle diameter is the potassium felspar sand of 40～60mm, the filler of middle particle diameter packing layer 22 is that particle diameter is the potassium felspar sand of 20～40mm, the filler of fine grain size packing layer 23 is that particle diameter is the combination of potassium felspar sand and the quartz sand that particle diameter is 2～6mm of 5～10mm, the height of described coarse grain footpath packing layer 21 is generally 200～250mm, and the height of middle particle diameter packing layer 22 is generally 400～500mm, and the height of fine grain size packing layer 23 is generally 100～150mm, in vertical current constructed wetland treating pond 2, be provided with water distributor A25, header A26 and air communication pipe 27, wherein, header A26 is arranged in the coarse grain footpath packing layer 21 in vertical current constructed wetland treating pond 2, header A26 adopts the form of supervisor both sides branch-line pipe, each branch-line pipe is perforated pipe (being responsible for not perforate), each branch-line pipe and supervisor's distribution is preferably " rich " font, the one end that forms the supervisor of header A26 is communicated with described blast main, the solid wall of the other end through the wet pond treating pond of perpendicular flow artificial and the wet pond of drowned flow artificial treating pond is communicated with the water distributor B35 in the treating pond of the wet pond of drowned flow artificial, thereby realize the layer that catchments of the wet pond of perpendicular flow artificial treating pond, the water distribution layer of the wet pond of drowned flow artificial treating pond is all communicated with atmosphere, effectively supplementary set oxygen, make whole system form different dissolved oxygen gradients, water distributor A25 is arranged in the fine grain size filler on vertical current constructed wetland treating pond 2 tops, is connected with the water inlet pipe 24 of vertical current constructed wetland treating pond 2, and water distributor A25 adopts a low hydraulic pressure automatic rotation water distribution of raising,
In described drowned flow artificial wet land treating pond 3, be filled with filler, filler is divided into upper and lower two-layer on the whole, it is fines layer 33 (plant growing layer) at the middle and upper levels, lower floor's filler can be divided into again 31 3 layers, coarse fodder layer 31, the middle bed of material 32 and coarse fodder layer from left to right successively, wherein the coarse fodder layer 31 of high order end is water distribution layer, the coarse fodder layer 31 of low order end is the layer that catchments, and the middle middle bed of material 32 is dephosphorization layer; The filler of described coarse fodder layer 31 is that particle diameter is the potassium felspar sand of 40～60mm, and the filler of the middle bed of material 32 is that particle diameter is the potassium felspar sand of 20～40mm, and the filler of fines layer 33 is that particle diameter is the combination of potassium felspar sand and the quartz sand that particle diameter is 2～6mm of 5～10mm; Their distances of crossing over from left to right of the coarse fodder layer 31 of described high order end and the coarse fodder layer of low order end 31 are identical, are preferably 250～350mm, and the distance between the coarse fodder layer 31 of high order end and the coarse fodder layer 31 of low order end is the shared span of the bed of material 32 in filling; The height of coarse fodder layer 31, the middle bed of material 32 and the coarse fodder layer 31 of the whole lower floor of described formation should be identical, be generally 600～750mm, and the height of described fines layer 33 is generally 100～150mm; Be provided with water port 34 in the middle and upper part of drowned flow artificial wet land treating pond 3,, be preferably arranged in the fines layer 33 in drowned flow artificial wet land treating pond 3.In the coarse fodder layer 31 of drowned flow artificial wet land treating pond 3 high order ends, be provided with water distributor B35, this water distributor B35 is communicated with the supervisor of the header A26 in vertical current constructed wetland treating pond 2, this water distributor B35 adopts the form of house steward both sides branch-line pipe, each spool is perforated pipe, and each spool and house steward's distribution is preferably " king " font; In drowned flow artificial wet land treating pond 3, in the coarse fodder layer 31 of low order end, be provided with header B36, this header B36 adopts the form of supervisor both sides branch-line pipe equally, each branch-line pipe is perforated pipe (being responsible for not perforate), each branch-line pipe and supervisor's distribution is preferably " T " font, to be conducive to collect the water after the middle bed of material 32 dephosphorization, wherein the supervisor of header B36 is communicated with water port 34, and the water of the process system processing of collecting is discharged by water port 34.
In above-mentioned embodiment, the wet pond treating pond of described perpendicular flow artificial and the wet pond of drowned flow artificial treating pond can be that rectangular parallelepiped or other are not planned shape, are preferably cuboid, and more preferably the long-width ratio of artificial swamp treating pond is more than or equal to 2:1.In the media assemblage of the fine grain size packing layer 23 of the wet pond of described perpendicular flow artificial treating pond, the weight ratio of the quartz sand that the potassium felspar sand that particle diameter is 5～10mm and particle diameter are 2～6mm is preferably 50～70:30～50; In the media assemblage of the fines layer 33 of the wet pond of described drowned flow artificial treating pond, the weight ratio of the quartz sand that the potassium felspar sand that particle diameter is 5～10mm and particle diameter are 2～6mm is preferably 50～70:30～50.In the packing layer of the superiors of the wet pond treating pond of perpendicular flow artificial and the wet pond of drowned flow artificial treating pond, all plant and have emergent 4, floristics can be selected according to local climate feature, preferably plant again the local waterplant such as power flower, Lu Di, can plant one or more miscegenations, spacing is no more than 9 strains with every square metre and is advisable.
Adopt the treatment process of composite type artificial wetland treatment system described in the utility model to be:
The sewage of front end after anaerobic treatment enters distribution reservoir 1 by the water-in 11 of distribution reservoir 1, through training wall 14 (SS drowning oneself being intercepted by training wall 14 can regularly regularly discharge by the sewage draining exit 12 of distribution reservoir 1 bottom), then flow out and enter water distributor A25 by the water inlet pipe 24 of vertical current constructed wetland treating pond 2 from the water outlet 13 of distribution reservoir 1, water distributor A25 connects a low hydraulic pressure automatic rotation water distributor of raising vertical current constructed wetland treating pond 2 is carried out to water distribution, water pouring plant from a low hydraulic pressure automatic rotation water distributor sewage out of raising, pass through successively the upper strata of vertical current constructed wetland treating pond 2, middle level and lower floor, the branch-line pipe that flows into header A26 is pooled to the supervisor of header A26 again, sewage enters the water distributor B35 in drowned flow artificial wet land treating pond 3 along the supervisor of header A26, current collect by each branch-line pipe of header B36 the supervisor who enters header B36 along level and upward flow after the middle bed of material 32, discharge finally by the water port 34 by drowned flow artificial wet land treating pond 3.
By system applies described in the utility model in the sanitary sewage disposal in rural area, in the Sewage treatment systems of specific design, the size of slight drag distribution reservoir 1 is 1m × 0.5m × 1m (length × wide × height), vertical current constructed wetland unit 2m × 1m × 1m (length × wide × height), drowned flow artificial wet land unit 2m × 1m × 1m (length × wide × height), the processing water yield is 2m
3/ d, the sewage quality that enters treatment system after anaerobic treatment is: CODcr:250mg/L; NH
3-N:25mg/L; TP:3.5mg/L; TN:35mg/L; SS:200mg/L; PH:7.4; The parameter of effluent quality: CODcr:48mg/L; NH3-N:5mg/L; TP:0.4mg/L; TN:7mg/L; SS:5mg/L; PH:7.8.
The content that above-described embodiment is illustrated should be understood to these embodiment only for being illustrated more clearly in the utility model, and be not used in restriction scope of the present utility model, after having read the utility model, those skilled in the art all should belong to the application's claims limited range to the amendment of the various equivalent form of values of the present utility model.
Claims (7)
1. a composite type artificial wetland treatment system, comprises and it is characterized in that vertical current constructed wetland treating pond (2) and the drowned flow artificial wet land treating pond (3) of mutual series connection:
Described vertical current constructed wetland treating pond (2) is arranged at the feed-water end of system, drowned flow artificial wet land treating pond (3) is arranged at the water side of system, this system also comprises a distribution reservoir (1), distribution reservoir (1) has a water-in (11) and a water outlet (13), training wall (14) is set in it, this distribution reservoir (1) is positioned at the feed-water end of system, and its water outlet (13) is communicated with the water inlet pipe (24) of vertical current constructed wetland treating pond (2);
Filler in described vertical current constructed wetland treating pond (2) is followed successively by coarse grain footpath packing layer (21), middle particle diameter packing layer (22) and fine grain size packing layer (23) from the bottom to top, wherein, the filler of coarse grain footpath packing layer (21) is that particle diameter is the potassium felspar sand of 40～60mm, and the filler of middle particle diameter packing layer (22) is that particle diameter is the potassium felspar sand of 20～40mm;
Described drowned flow artificial wet land treating pond (3) is provided with water port (34), filler in this drowned flow artificial wet land treating pond (3) is followed successively by coarse fodder layer (31), the middle bed of material (32) and coarse fodder layer (31) from left to right, above these three kinds of packing layers, be also provided with one deck fines layer (33), wherein, the filler of coarse fodder layer (31) is that particle diameter is the potassium felspar sand of 40～60mm, and the filler of the middle bed of material (32) is that particle diameter is the potassium felspar sand of 20～40mm.
2. composite type artificial wetland treatment system according to claim 1, it is characterized in that: in described vertical current constructed wetland treating pond (2), be also provided with water distributor A (25), header A (26) and air communication pipe (27), one end of described header A (26) is communicated with air communication pipe (27), and the other end is communicated with the water distributor B (35) in drowned flow artificial wet land treating pond (3).
3. composite type artificial wetland treatment system according to claim 2, is characterized in that: described header A (26) is positioned at the middle and lower part of vertical current constructed wetland treating pond (2).
4. composite type artificial wetland treatment system according to claim 2, is characterized in that: described water distributor B (35) is positioned at the middle and lower part of drowned flow artificial wet land treating pond (3).
5. according to the composite type artificial wetland treatment system described in any one in claim 1～4, it is characterized in that: in described vertical current constructed wetland treating pond (2), the height of coarse grain footpath packing layer (21) is 200～250mm, the height of middle particle diameter packing layer (22) is 400～500mm, and the height of fine grain size packing layer (23) is 100～150mm.
6. according to the composite type artificial wetland treatment system described in any one in claim 1～4, it is characterized in that: in described drowned flow artificial wet land treating pond (3), the distance that coarse fodder layer (31) is crossed over is from left to right 250～350mm; Described coarse fodder layer (31), the middle bed of material (32) are identical with the height of coarse fodder layer (31), are 600～750mm, and the height of described fines layer (33) is 100～150mm.
7. according to the composite type artificial wetland treatment system described in any one in claim 1～4, it is characterized in that: described water distributing pipe also has a sewage draining exit (12).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201420181307.1U CN203866150U (en) | 2014-04-15 | 2014-04-15 | Compound constructed wetland treatment system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420181307.1U CN203866150U (en) | 2014-04-15 | 2014-04-15 | Compound constructed wetland treatment system |
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| CN201420181307.1U Expired - Fee Related CN203866150U (en) | 2014-04-15 | 2014-04-15 | Compound constructed wetland treatment system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103910472A (en) * | 2014-04-15 | 2014-07-09 | 桂林电子科技大学 | Composite artificial wetland treatment system |
| CN112978920A (en) * | 2021-02-03 | 2021-06-18 | 湖南惟创环境科技有限公司 | Modular combined type pollution-free sewage treatment equipment |
-
2014
- 2014-04-15 CN CN201420181307.1U patent/CN203866150U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103910472A (en) * | 2014-04-15 | 2014-07-09 | 桂林电子科技大学 | Composite artificial wetland treatment system |
| CN103910472B (en) * | 2014-04-15 | 2015-07-29 | 桂林电子科技大学 | A kind of composite type artificial wetland treatment system |
| CN112978920A (en) * | 2021-02-03 | 2021-06-18 | 湖南惟创环境科技有限公司 | Modular combined type pollution-free sewage treatment equipment |
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Granted publication date: 20141008 Termination date: 20170415 |
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