CN211226559U - Stepped natural type artificial wetland - Google Patents
Stepped natural type artificial wetland Download PDFInfo
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- CN211226559U CN211226559U CN201921834079.2U CN201921834079U CN211226559U CN 211226559 U CN211226559 U CN 211226559U CN 201921834079 U CN201921834079 U CN 201921834079U CN 211226559 U CN211226559 U CN 211226559U
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- wetland
- constructed wetland
- artificial wetland
- stepped
- denitrification
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Abstract
The utility model discloses a step-type natural constructed wetland, which solves the problems of difficult sewage treatment and large occupied area of constructed wetland in the existing mountainous area, terraced fields and hills, and adopts the technical scheme that the step-type natural constructed wetland comprises constructed wetland units which are arranged in series along the slope of the constructed wetland and have more than two stages, and a drop dam which is built by large stones is built between the adjacent two stages of constructed wetland units; the inlet of the first-stage artificial wetland unit is connected with the water collecting tank through the front denitrification wall, and the outlet of the last-stage artificial wetland unit is connected with the channel through the rear denitrification wall; the artificial wetland unit is sequentially paved with an impermeable membrane and a planting soil layer from bottom to top, and aquatic plants are planted on the planting soil. The utility model discloses simple structure, easily build, operation and maintenance cost are low, block dirty effectual, adaptability is good, area is little, be fit for the sewage treatment in areas such as mountain area, terraced fields, hills.
Description
Technical Field
The utility model relates to an ecological engineering blocks dirty field, specific constructed wetland that says so.
Background
The wetland is used as a sewage ecological treatment technology with low investment, low energy consumption and high removal rate of organic pollutants, nitrogen and phosphorus, and has great development potential in agricultural non-point source pollution treatment. One difficulty in wetland application design is the problem of land occupation. In practical application, mountainous areas, terraces and hilly lands with large elevation difference often meet the situation that a large enough area is not available in the same place to construct the wetland. The wetland process can not meet the wetland construction requirements, the application of the wetland process is limited, and the advantages of the wetland process can not be exerted.
Disclosure of Invention
The invention aims to solve the technical problems and provides the stepped natural type artificial wetland which has the advantages of simple structure, easy construction, low operation and maintenance cost, good sewage blocking effect, good adaptability, small occupied area and suitability for sewage treatment in mountainous areas, terraces, hills and other areas.
The technical scheme includes that the artificial wetland comprises more than two stages of artificial wetland units which are arranged in series along the slope of the artificial wetland in a stepped manner, and a drop dam formed by large-scale stone blocks is built between every two adjacent stages of artificial wetland units; the inlet of the first-stage artificial wetland unit is connected with the water collecting tank through the front denitrification wall, and the outlet of the last-stage artificial wetland unit is connected with the channel through the rear denitrification wall; the artificial wetland unit is sequentially paved with an impermeable membrane and a planting soil layer from bottom to top, and aquatic plants are planted on the planting soil.
The front denitrification wall and the rear denitrification wall have the same structure and comprise linings on the front side and the rear side and a denitrification filler layer filled between the linings; the lining is made of sand-free concrete, and the denitrification filler layer is formed by mixing wood chips and soil.
The thickness of the front denitrification wall and the rear denitrification wall is 0.5-0.7m, and the height of the underground part is 0.8-1.2 m.
The middle part of the artificial wetland unit is a sunken buffer precipitation area.
The sinking depth of the buffer sedimentation zone is 15-25 cm.
The height difference of the two adjacent stages of artificial wetland units is 0.8-1.5 m.
The depth of the water collecting groove is 0.4-0.6 m.
And stone pavements are paved on the top surfaces of the front denitrification wall and the rear denitrification wall.
Has the advantages that:
agricultural non-point source sewage is collected through a water collecting tank, the sewage flows through a front denitrification wall through seepage flow, nitrogen load of high-concentration farmland runoff is subjected to preliminary treatment, then the sewage permeates constructed wetland units connected in series, deep treatment is performed through the wetland, drop dams are arranged among all levels of wetland units, water flow state is adjusted, severe cutting of a river channel and landslide are avoided, deepening is performed among all levels of wetland units, the effect of slow flow sedimentation is achieved, the back denitrification wall is built at the tail end of the wetland, a certain water level of adjacent shallow water wetland is guaranteed, nitrogen in water is further removed, and water finally flows are collected into a main ditch through infiltration and overflow. The utility model discloses special simple structure, easily build, operation and maintenance cost are low, block dirty effectual, adaptability is good, area is little, is applicable to the sewage treatment in mountain area, terraced fields, hilly area.
Drawings
Fig. 1 is a cross-sectional view of the present invention.
1-water collecting tank, 2-front denitrification wall, 2.1-lining, 2.2-denitrification filler layer, 3-constructed wetland unit, 3.1-impermeable membrane, 3.2-planting soil layer, 3.3-aquatic plant, 3.4-buffer settling zone, 4-rear denitrification wall, 5-channel, 6-stone-like street and 7-drop dam.
Detailed Description
The invention will be further explained with reference to the drawings:
referring to fig. 1, more than two stages of artificial wetland units 3 are arranged in series in a stepped manner along the slope of the artificial wetland, the height difference of the adjacent two stages of artificial wetland units 3 is 0.8-1.5m, a drop dam 7 formed by stacking large-sized stone blocks is built between the adjacent two stages of artificial wetland units, the drop dam 7 is built by stone blocks with the grain diameter of 0.25-1m, water in the previous stage of artificial wetland unit 3 flows into the next stage of artificial wetland unit 3 through the drop dam 7, and the drop dam 7 can adjust the flow state of water flow and avoid severe river channel undercut and landslide;
the inlet of the first-stage artificial wetland unit 3 is connected with the water collecting tank 1 through the front denitrification wall 2, and the outlet of the last-stage artificial wetland unit 3 is connected with the channel 5 through the rear denitrification wall 4; the depth of the water collecting tank 1 is preferably 0.4-0.6m, and the water collecting tank is used for collecting sewage and enabling the sewage to enter the artificial wetland unit through the front denitrification wall 2. And the top surfaces of the front denitrification wall 2 and the rear denitrification wall 4 are respectively paved with a stone row 6 for people to walk conveniently, the size of the stone row 6 is 60cm by 30cm by 5cm, and the distance between the center lines of adjacent stones is 50 cm.
The front denitrification wall connecting piece 2 and the rear denitrification wall connecting piece 4 have the same structure and are used for treating nitrogen in sewage, and the front denitrification wall connecting piece and the rear denitrification wall connecting piece comprise linings 2.1 on the front side and the rear side and a denitrification filler layer 2.2 filled between the linings 2.1; the lining 2.1 is sand-free concrete, the sand-free concrete is concrete without fine aggregate, only coarse aggregate is used, and the concrete has good water permeability, the source of the sand-free concrete in the technical scheme of the application is not particularly limited, the sand-free concrete can be prepared by adopting conventional sand-free concrete in the field, the denitrification filler layer comprises wood chips and soil, and the volume mixing ratio of the wood chips to the soil is preferably 1: (1.5-3), more preferably 1: 2; the thickness of the front denitrification wall 2 and the rear denitrification wall 4 is preferably 0.5-0.7m, and the height of the underground part is preferably 0.8-1.2 m.
The artificial wetland unit 3 is sequentially paved with an impermeable membrane 3.1 and planting soil 3.2 from bottom to top, and aquatic plants 3.3 are planted on the planting soil layer 3.2. The middle part of the artificial wetland unit 3 is a buffer precipitation zone 3.4 with the precipitation depth of 15-25 cm. Cattail with strong water resistance is preferably planted on the planting soil layer 3.3 of the ground buffer precipitation area 3.4, the planting density is 10-16 cattail per square meter, and calamus is preferably planted on the planting soil layer 3.3 of other shallow flow areas, and the planting density is 10-16 cattail per square meter.
Agricultural non-point source sewage is collected to water catch bowl 1, denitrification wall 2 before flowing through the seepage flow, carry out preliminary treatment to the nitrogen load of the farmland runoff of high concentration through preceding denitrification wall 2, then the multistage constructed wetland unit 3 of infiltration series connection, carry out advanced treatment to the sewage ground through multistage constructed wetland unit, set up the drop dam between each grade of wet constructed wetland unit 3, be used for adjusting the rivers flow regime, and avoid river course undercut acutely and the landslide appears, dig deeply in the middle of each grade of wetland and form buffering precipitation zone 3.4, play the effect that the slow flow deposits, last back denitrification wall 4 again, further get rid of aquatic nitrogen, rivers finally converge into channel 5 through infiltration and overflow.
Claims (8)
1. A step-type natural type artificial wetland comprises an artificial wetland, and is characterized in that more than two stages of artificial wetland units are arranged in series along the slope of the artificial wetland in a step-type manner, and a drop dam formed by large-scale stone blocks is built between the adjacent two stages of artificial wetland units; the inlet of the first-stage artificial wetland unit is connected with the water collecting tank through the front denitrification wall, and the outlet of the last-stage artificial wetland unit is connected with the channel through the rear denitrification wall; the artificial wetland unit is sequentially paved with an impermeable membrane and a planting soil layer from bottom to top, and aquatic plants are planted on the planting soil.
2. The stepped natural-type constructed wetland according to claim 1, wherein the front denitrification wall and the rear denitrification wall have the same structure and comprise linings on the front and rear sides and a denitrification filler layer filled between the linings; the lining is made of sand-free concrete, and the denitrification filler layer is formed by mixing wood chips and soil.
3. The stepped natural-type constructed wetland according to claim 1 or 2, wherein the front denitrification wall and the rear denitrification wall have a thickness of 0.5 to 0.7m and an underground portion height of 0.8 to 1.2 m.
4. The stepped natural-type constructed wetland according to claim 1, wherein the middle part of the constructed wetland unit is a sunken buffer settling zone.
5. The stepped natural-type constructed wetland according to claim 4, wherein the subsidence depth of the buffering sedimentation zone is 15 to 25 cm.
6. The stepped natural-type constructed wetland according to claim 1, wherein the height difference between the adjacent two stages of constructed wetland units is 0.8 to 1.5 m.
7. The stepped natural-type constructed wetland according to claim 1, wherein the depth of the water collection grooves is 0.4 to 0.6 m.
8. The stepped natural-type constructed wetland according to claim 1, wherein a stone pavement is laid on the top surfaces of the front denitrification wall and the rear denitrification wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921834079.2U CN211226559U (en) | 2019-10-29 | 2019-10-29 | Stepped natural type artificial wetland |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921834079.2U CN211226559U (en) | 2019-10-29 | 2019-10-29 | Stepped natural type artificial wetland |
Publications (1)
| Publication Number | Publication Date |
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| CN211226559U true CN211226559U (en) | 2020-08-11 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921834079.2U Active CN211226559U (en) | 2019-10-29 | 2019-10-29 | Stepped natural type artificial wetland |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN211226559U (en) |
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2019
- 2019-10-29 CN CN201921834079.2U patent/CN211226559U/en active Active
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