Combined artificial wetland system

Abstract

The utility model provides a combined artificial wetland system which comprises a regulating reservoir, a subsurface flow wetland comprising a plurality of drawer type filter material layers, a surface flow wetland and a water storage tank, wherein sewage sequentially passes through the regulating reservoir, the subsurface flow wetland and the surface flow wetland; the subsurface flow wetland comprises a first-stage horizontal subsurface flow wetland and a second-stage horizontal subsurface flow wetland; the regulating reservoir, the first-stage horizontal subsurface flow wetland, the second-stage horizontal subsurface flow wetland and the surface flow wetland are sequentially distributed in a stepped structure through water distribution pipes; a water distribution plate is arranged between the drawer type filter material layers; a pulse water distributor and a liquid level meter are arranged in the adjusting tank, the pulse water distributor distributes water to the subsurface flow wetland and the surface flow wetland through a water distribution pipeline according to a preset pulse frequency, and part of treated water in the water storage tank flows back to the adjusting tank through a pulse return pipe. According to the utility model, the treatment capacity and the nitrogen and phosphorus removal effect of the constructed wetland are improved, and meanwhile, the objective problems in the aspects of filter material cleaning and replacement and the like are solved.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a combined artificial wetland system. Background Art

[0002] As a natural "wastewater treatment plant", artificial wetlands are characterized by high efficiency, simplicity and low consumption. They can not only achieve the effect of greening and beautifying the landscape, but also obtain better benefits. Traditional artificial wetlands may have problems such as excessive accumulation of suspended solids (SS) load, resulting in blockage, reduced water flow rate of the system, and low efficiency of nitrogen removal and phosphorus removal. In addition, the denitrification effect of existing wetland treatment systems is limited. Therefore, for artificial wetlands, it is necessary to optimize both the denitrification effect and the water delivery structure of the system, so as to improve the overall sewage treatment capacity of artificial wetlands. This application proposes a new combined artificial wetland system. Utility Model Content

[0003] The embodiment of the utility model provides a combined artificial wetland system, which improves the processing capacity and nitrogen and phosphorus removal effect of the artificial wetland, and solves objective problems in filter material cleaning and replacement, etc.

[0004] The utility model provides a combined artificial wetland system, which includes a regulating tank, a subsurface wetland including a plurality of drawer-type filter material layers, a surface flow wetland, and a water storage tank. Sewage passes through the regulating tank, the subsurface wetland, and the surface flow wetland in sequence. The water storage tank is configured to store treated water.

[0005] The subsurface flow wetland includes a primary horizontal subsurface flow wetland and a secondary horizontal subsurface flow wetland, and the regulating pond, the primary horizontal subsurface flow wetland, the secondary horizontal subsurface flow wetland, and the surface flow wetland are sequentially connected by water distribution pipes and are distributed in a stepped structure;

[0006] A water distribution plate is provided between the drawer-type filter material layers, and the filler layer in the drawer-type filter material layer is filled in the drawer; a pulse water distributor and a liquid level meter are provided in the regulating tank, and the pulse water distributor distributes water to the subsurface flow wetland and the surface flow wetland through the water distribution pipeline according to a preset pulse frequency, and returns part of the treated water in the water storage tank to the regulating tank through the pulse reflux pipe.

[0007] Optionally, the drawer-type filter material layer of the subsurface flow wetland includes, from top to bottom, a first filter material layer, a second filter material layer, a third filter material layer, a fourth filter material layer, and wetland plants arranged on the top layer.

[0008] Optionally, it also includes a filter layer base, which is placed under the fourth filter layer; the wetland plants include yellow calamus or water plantain.

[0009] Optionally, the surface flow wetland includes floating plants and submerged plants, the floating plants include water turtles, and the submerged plants include Vallisneria.

[0010] Optionally, the water distribution plate includes evenly distributed water outlet holes; and filters are provided between the water outlet holes.

[0011] Optionally, the surface flow wetland and / or the subsurface flow wetland comprises biochar, wherein the biochar is in close proximity to plants in the wetland.

[0012] Optionally, it also includes a soil layer, and the wetland plants penetrate into the soil layer.

[0013] The beneficial effects of the utility model are:

[0014] The combined wetland is distributed in a stepped structure with decreasing height according to the regulating pool, subsurface wetland, surface flow wetland and water storage tank, so that the sewage passes through the aforementioned treatment process in sequence, and the treated water is finally stored in the water storage tank; the subsurface wetland includes a first-level horizontal subsurface wetland and a second-level horizontal subsurface wetland, and the double subsurface wetland design can more effectively reduce the concentration of pollutants and remove solid impurities; in addition, the drawer-type filter layer is not only convenient for replacement, cleaning and maintenance, but also can be replaced in situ without stopping water, which improves the convenience of the treatment process; in addition, water is distributed in a pulse manner, and the pulse interval can be used for static treatment of sewage in wetlands at all levels. The pulse water distribution has a good water delivery effect, which is conducive to breaking the blockage of solid impurities. That is, the combined artificial wetland provided by the utility model adopts a multi-stage combined stepped artificial wetland treatment system with a stepped structure. After the sewage is filtered by the two-stage subsurface wetland, the concentration of pollutants is reduced and the solid impurities are removed, and then it flows through the surface flow to replenish the oxygen in the system, thereby promoting the nitrification and denitrification process. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A schematic diagram showing the structure of a combined artificial wetland system provided in an embodiment of the present application;

[0016] Figure 2 A partial schematic diagram showing the relative positions of the second filter material layer and the water distribution plate in the embodiment of the present application.

[0017] Reference numerals:

[0018] 1: regulating tank; 2: pulse water distributor; 3: water distribution pipe; 4: primary horizontal subsurface flow wetland; 5: water distribution plate; 6: first filter material layer; 7: second filter material layer; 8: third filter material layer; 9: fourth filter material layer; 10: surface flow wetland; 11: water storage tank; 12: pulse return pipe; 13: wetland plants, 14: floating plants, 15: submerged plants. DETAILED DESCRIPTION

[0019] The technical solutions in the application embodiments will be described clearly and completely below in conjunction with the accompanying drawings in the application embodiments. In addition, the phrases "in one embodiment" or "in an embodiment" appearing in various places throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics may be combined in one or more embodiments in any suitable manner.

[0020] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that an article or terminal device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such article or terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the article or terminal device including the elements.

[0021] As a natural "wastewater treatment plant", artificial wetlands are characterized by high efficiency, simplicity and low consumption. They can not only achieve the effect of greening and beautifying the landscape, but also obtain good benefits. Currently, artificial wetlands have been widely used at home and abroad. Traditional artificial wetlands will have problems such as excessive accumulation of suspended solids (SS) loads, resulting in blockage, decreased water flow rate, and low efficiency of nitrogen removal and phosphorus removal. Therefore, for artificial wetlands, it is necessary to optimize both the denitrification effect and the water delivery structure of the system, so as to improve the overall sewage treatment capacity of artificial wetlands. This application proposes a new combined artificial wetland system.

[0022] The present utility model provides a combined artificial wetland system. Figure 1 and Figure 2 shown.

[0023] like Figure 1As shown, the utility model provides a combined artificial wetland system, which includes a regulating tank 1, a subsurface wetland including multiple drawer-type filter material layers, a surface flow wetland 10, and a water storage tank 11. The sewage passes through the regulating tank 1, the subsurface wetland, and the surface flow wetland 10 in sequence, and the water storage tank 11 is configured to store treated water; the subsurface wetland includes a primary horizontal subsurface wetland 4 and a secondary horizontal subsurface wetland, and the regulating tank 1, the primary horizontal subsurface wetland 4, the secondary horizontal subsurface wetland, and the surface flow wetland 10 are sequentially passed through a water distribution pipe 3 and are distributed in a stepped structure; in addition, a water distribution plate 5 is provided between the drawer-type filter material layers, and the filler layer in the drawer-type filter material layer is filled in the drawer; a pulse water distributor 2 and a liquid level meter are provided in the regulating tank 1, and the pulse water distributor 2 distributes water to the subsurface wetland and the surface flow wetland 10 through the water distribution pipe 3 according to a preset pulse frequency, and returns part of the treated water in the water storage tank 11 to the regulating tank 1 through the pulse reflux pipe 12.

[0024] As described above, the combined wetland is distributed in a stepped structure with decreasing height according to the regulating pool 1, the subsurface wetland, the surface flow wetland 10, and the water storage tank 11, so that the sewage undergoes the aforementioned treatment process in sequence, and the treated water is finally stored in the water storage tank 11; wherein the subsurface wetland includes a first-level horizontal subsurface wetland 4 and a second-level horizontal subsurface wetland, and the double subsurface wetland design can more effectively reduce the concentration of pollutants and remove solid impurities; in addition, the drawer-type filter layer is not only convenient for replacement, cleaning and maintenance, but also can be replaced in situ without stopping water, which improves the convenience of the treatment process; in addition, water is distributed in a pulse manner, and the pulse interval can be used for static treatment of sewage in wetlands at all levels. The pulse water distribution has a good water delivery effect, which is conducive to breaking the blockage of solid impurities. That is, the combined artificial wetland provided by the utility model adopts a multi-stage combined stepped artificial wetland treatment system with a stepped structure. After the sewage is filtered by the two-stage subsurface wetland, the concentration of pollutants is reduced, and the solid impurities are removed. Then it flows through the surface flow to replenish the oxygen in the system, thereby promoting the nitrification and denitrification process.

[0025] The aforementioned multi-stage combined stepped artificial wetland combines the subsurface artificial wetland and the surface flow artificial wetland, and utilizes the subsurface wetland to remove NH3-N (referring to ammonia nitrogen), TP (referring to the total amount of organic phosphorus and organic phosphorus) and COD (referring to chemical oxygen demand, i.e. the total amount of oxidized substances) in the sewage. The surface flow wetland 10 is conducive to the removal of TN (referring to total nitrogen) in the sewage. This combination method not only plays the advantages of the two wetland systems, but also overcomes each other's shortcomings. At the same time, the stepped drop formed can create a richer habitat for organisms, increase species diversity, facilitate the biological action in the wetland sewage purification process, and improve the removal rate of pollutants in the system. At the same time, the utility model adopts a drawer-type filter material layer layout to effectively solve the problem of filter material replacement and cleaning, and can also effectively switch the water flow of different filter material layers and switch targeted filter materials according to changes in water quality.

[0026] The drawer-type filter material layer of the subsurface flow wetland includes, from top to bottom, a first filter material layer 6, a second filter material layer 7, a third filter material layer 8, a fourth filter material layer 9, and wetland plants 13 arranged on the top layer.

[0027] In the above, the first filter material layer 6, the second filter material layer 7, the third filter material layer 8 and the fourth filter material layer 9 are the matrix in the artificial wetland. As an important component of the artificial wetland, the matrix provides a growth environment for wetland plants 13 and microorganisms, and also participates in the physical and chemical process of sewage purification in the artificial wetland; the wetland plants 13 have the functions of absorbing, adsorbing and enriching pollutants, and can also transmit oxygen, provide a habitat for microorganisms, maintain system stability, and reasonable artificial wetland design, matrix selection, and plant selection determine the efficiency of nitrogen removal, phosphorus removal and suspended solids reduction of the wetland treatment system. In this embodiment, the matrix at least includes: a pebble layer, a volcanic rock layer, a chlorite layer, and a quartz sand layer, which can be arranged in layers, or the pebbles, volcanic rocks, chlorite and quartz sand can be mixed and used according to the special needs of the sewage components.

[0028] In some embodiments, Figure 1 As shown, it also includes a filter material layer base, which is placed under the fourth filter material layer 9; the wetland plants 13 include yellow calamus or water plantain. The surface flow wetland 10 includes floating plants 14 and submerged plants 15, the floating plants 14 include water turtles, and the submerged plants 15 include Vallisneria.

[0029] In addition, in the present application, a water distribution plate 5 is included between each filter material layer, and the water distribution plate 5 can be configured to include multiple evenly distributed water outlet holes. In order to prevent some small particles of impurities from passing through the entire filter material layer and flowing out from the water outlet holes of the water distribution plate 5, a filter screen can be provided at the water outlet holes to filter small particles of impurities. In addition, because the water distribution plate 5 is provided, it is convenient to directly extract each filter material layer for replacement or cleaning.

[0030] It should also be noted that the pulse water distributor 2 is used in the present application to distribute water to the treatment system. Taking the siphon pulse water distributor 2 as an example, the specific explanation of water distribution is as follows: the siphon pulse water distributor 2 starts to take in water. When the liquid level meter detects that the incoming water reaches a certain liquid level, the air in the siphon pulse water distributor 2 is emptied to produce a siphon effect. The incoming water in the siphon pulse water distributor 2 quickly enters the water distribution pipe 3-way system for water distribution. When the liquid level in the siphon pulse water distributor 2 drops to the preset liquid level, the siphon effect disappears, and the water distribution ends, that is, a pulse water distribution cycle is completed. Of course, other devices suitable for pulse water distribution can also be selected, and this embodiment does not make specific restrictions on this.

[0031] In some embodiments, the surface flow wetland 10 and / or the subsurface flow wetland include biochar, and the biochar is close to the plants in the wetland. The grid structure made of biochar can provide some nutrients for the plants in the wetland to help the plants grow. In addition, a soil layer can be set, and the wetland plants 13 penetrate into the soil layer to increase the diversity of wetland microorganisms and improve the ecology of the artificial wetland. The position of the specific soil layer is not specifically limited in this embodiment.

[0032] The combined artificial wetland system provided by the utility model comprises a regulating pool 1, a primary horizontal subsurface flow wetland 4, a secondary horizontal subsurface flow wetland, a surface flow wetland 10 and a water storage tank 11 which are distributed in a stepped structure;

[0033] The sewage is distributed into the regulating tank 1, and the pulse water distributor 2 is used to distribute the sewage in the regulating tank 1 to the primary horizontal subsurface flow wetland 4, and the primary treated water is obtained after treatment;

[0034] The primary treated water is distributed into the secondary horizontal subsurface flow wetland, and the secondary treated water is obtained after treatment;

[0035] The secondary treated water is distributed into the surface flow wetland 10, and the tertiary treated water is obtained after treatment;

[0036] The tertiary treated water is introduced into the water storage tank 11 , and the pulse water distributor 2 recycles part of the tertiary treated water to the regulating tank 1 .

[0037] In addition, the aforementioned first-level horizontal subsurface flow wetland 4 and second-level horizontal subsurface flow wetland both include drawer-type filter material layers, and also include: replacing the drawer-type filter material layers in situ without stopping water according to a preset period.

[0038] The specific operation process of the combined artificial wetland system provided by the utility model is as follows: the sewage is passed through the regulating tank 1 to precipitate impurities, etc., and is distributed to the primary horizontal submerged flow wetland 4 through the unpowered pulse water distributor 2 for denitrification, and most of the SS (suspended solids in sewage) is removed to obtain primary treated water; the primary treated water is distributed to the secondary horizontal submerged flow wetland for treatment to obtain secondary treated water, and after passing through the two-stage submerged flow wetland, the pollutant concentration is reduced and solid impurities are removed; the secondary treated water is then distributed to the surface flow wetland 10 for treatment to obtain tertiary treated water, and at the same time, the oxygen in the wetland system is supplemented to promote the nitrification and denitrification process. The tertiary treated water flowing out of the surface flow wetland 10 is collected in the water storage tank 11, wherein part of the tertiary treated water is returned to the primary horizontal submerged flow wetland 4 through pulses, and is used to dilute the sewage and increase the fluidity of the system water.

[0039] As described above, the horizontal subsurface artificial wetland system and the surface flow artificial wetland are combined to achieve efficient removal of pollutants by relying on the combined effect of nitrification and denitrification of microorganisms. In addition, in some embodiments, it also includes: according to the changes in water quality and water load, the water distribution mode of the pulse water distributor 2 is switched according to the changes in water volume and water quality. This targeted switching of water distribution operation can effectively solve the problems of plant dryness and death caused by water overload or insufficient water during the operation of the artificial wetland.

[0040] In addition, the layout of the drawer-type filter media layer can, on the one hand, effectively solve the problem of in-situ cleaning and regeneration of the filter media and in-situ replacement of the filter media without stopping the water supply when the filter media is blocked. On the other hand, it is convenient to switch the water distribution mode in a targeted manner according to the changes in water quality and water load, thereby improving the convenience of the process.

[0041] It can be implemented that the aforementioned artificial wetland has a length-to-width ratio greater than or equal to 2:1, and the matrix can be pebbles and volcanic rocks, chlorite and quartz sand from bottom to top. Of course, other corresponding filter materials can be replaced in situ according to the changes in water quality. There is a water distribution plate 5 between the drawer-type filter material layers. The liquid passes through the water distribution plate 5 at the bottom of the first filter material layer 6 to the second filter material layer 7. After layer-by-layer treatment, it flows into the surface flow wetland 10. The drawer-type filter material layer can replace the filter material according to demand, and it is also easy to maintain. The wetland plants 13 are selected from yellow calamus and water onion. The submerged plant 15 of the surface flow wetland 10 is preferably Vallisneria, and the floating plant 14 is preferably water turtle.

[0042] Finally, the utility model provides a combined artificial wetland system, which includes a regulating tank 1, a subsurface wetland including multiple drawer-type filter material layers, a surface flow wetland 10, and a water storage tank 11. The sewage passes through the regulating tank 1, the subsurface wetland, and the surface flow wetland 10 in sequence, and the water storage tank 11 is configured to store treated water; the subsurface wetland includes a primary horizontal subsurface wetland 4 and a secondary horizontal subsurface wetland, and the regulating tank 1, the primary horizontal subsurface wetland 4, the secondary horizontal subsurface wetland, and the surface flow wetland 10 are sequentially passed through a water distribution pipe 3 and distributed in a stepped structure; a water distribution plate 5 is provided between the drawer-type filter material layers, and the filler layer in the drawer-type filter material layer is filled in the drawer; a pulse water distributor 2 and a liquid level meter are provided in the regulating tank 1, and the pulse water distributor 2 distributes water to the subsurface wetland and the surface flow wetland 10 through the water distribution pipe 3 according to a preset pulse frequency, and returns part of the treated water in the water storage tank 11 to the regulating tank 1 through the pulse reflux pipe 12. The utility model improves the processing capacity and nitrogen and phosphorus removal effect of the artificial wetland, and solves objective problems in the cleaning and replacement of filter materials, etc.

[0043] It should be noted that the above embodiments all belong to the same utility model concept, and the description of each embodiment has its own focus. For the parts not described in detail in individual embodiments, reference can be made to the description in other embodiments. Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other.

[0044] The above embodiments only express the implementation methods of the utility model, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, and these all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A combined artificial wetland system, characterized in that: It comprises a regulating tank (1), a subsurface flow wetland including a plurality of drawer-type filter material layers, a surface flow wetland, and a water storage tank (11), wherein sewage passes through the regulating tank (1), the subsurface flow wetland, and the surface flow wetland (10) in sequence, and the water storage tank (11) is configured to store treated water; The subsurface flow wetland comprises a primary horizontal subsurface flow wetland (4) and a secondary horizontal subsurface flow wetland, and the regulating pond (1), the primary horizontal subsurface flow wetland (4), the secondary horizontal subsurface flow wetland, and the surface flow wetland (10) are sequentially connected through a water distribution pipe (3) and are distributed in a stepped structure; A water distribution plate (5) is provided between the drawer-type filter material layers, and the filler layer in the drawer-type filter material layer is filled in the drawer; a pulse water distributor (2) and a liquid level meter are provided in the regulating tank (1); the pulse water distributor (2) distributes water to the subsurface flow wetland and the surface flow wetland (10) through a water distribution pipe (3) according to a preset pulse frequency, and returns part of the treated water in the water storage tank (11) to the regulating tank (1) through a pulse return pipe.

2. The combined artificial wetland system according to claim 1, characterized in that: The drawer-type filter material layer of the subsurface wetland comprises, from top to bottom, a first filter material layer (6), a second filter material layer (7), a third filter material layer (8), a fourth filter material layer (9), and wetland plants (13) arranged on the top layer.

3. The combined artificial wetland system according to claim 2, characterized in that: It also includes a filter material layer base, which is placed under the fourth filter material layer (9); the wetland plants (13) include yellow calamus or water plantain.

4. The combined artificial wetland system according to claim 2, characterized in that: The surface flow wetland (10) includes floating plants (14) and submerged plants (15), wherein the floating plants (14) include water turtles, and the submerged plants (15) include Vallisneria.

5. The combined artificial wetland system according to claim 1, characterized in that: The water distribution plate (5) comprises evenly distributed water outlet holes; filters are provided between the water outlet holes.

6. The combined artificial wetland system according to claim 1, characterized in that: The surface flow wetland (10) and / or the subsurface flow wetland comprises biochar, which is close to plants in the wetland.

7. The combined artificial wetland system according to claim 2, characterized in that: Also included is a soil layer, wherein the wetland plants (13) penetrate into the soil layer.

Images