CN111115817A - Artificial wetland enhanced denitrification device and process suitable for northern cold areas - Google Patents
Artificial wetland enhanced denitrification device and process suitable for northern cold areas Download PDFInfo
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- CN111115817A CN111115817A CN202010020451.7A CN202010020451A CN111115817A CN 111115817 A CN111115817 A CN 111115817A CN 202010020451 A CN202010020451 A CN 202010020451A CN 111115817 A CN111115817 A CN 111115817A
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- rectifying
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/30—Aerobic and anaerobic processes
- C02F3/302—Nitrification and denitrification treatment
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F7/00—Aeration of stretches of water
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/16—Nitrogen compounds, e.g. ammonia
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2301/00—General aspects of water treatment
- C02F2301/10—Temperature conditions for biological treatment
- C02F2301/106—Thermophilic treatment
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Abstract
The utility model provides a constructed wetland enhanced denitrification device and technology suitable for cold area in north, includes the rectifying area, and the rectifying area is equipped with a plurality of guide plates through the even water of perforation tracery wall, and it is inside along width direction, has laid big resistance distribution pipe and aerated conduit in the bottom in rectifying area, and big resistance distribution pipe sets up anterior at the rectifying area, and aerated conduit sets up the well rear portion in the rectifying area. The effluent of the rectifying area is connected with the artificial wetland through the perforated tracery wall. And partially refluxing the effluent of the artificial wetland to the front end of the rectification area through a high-resistance water distribution pipeline, and aerating the middle part and the rear part of the rectification area. The invention can realize the enhanced removal of ammonia nitrogen and total nitrogen of the artificial wetland and the efficient operation in winter, and effectively saves the floor area and the energy consumption of the artificial wetland.
Description
Technical Field
The invention belongs to the technical field of environmental protection, and particularly relates to an artificial wetland enhanced denitrification device and process suitable for northern cold regions.
Background
Eutrophication of water environments such as lakes and the like causes a lot of damage to human beings, such as environmental, ecological and economic aspects, and nitrogen is one of the main nutrients causing eutrophication of water environments. The exogenous nitrogen load (a point source and a non-point source) is an important component of the water environment pollution load. The traditional sewage treatment technology is applied to treatment of non-point source pollution which is deficient in a collection system, the cost is too high, and the artificial wetland is an important technical means for effectively reducing the load of exogenous nitrogen in the water environment and is often applied to prevention and treatment of water environment eutrophication. The main way of denitrification of the artificial wetland is to rely on the nitrification and denitrification of microorganisms, while other removal ways such as plant absorption and ammonia nitrogen volatilization have very small removal amount, and in most of domestic artificial wetlands, the removal rate of BOD and TSS is very high, while the removal rate of nitrogen is relatively low. Aiming at the phenomenon that the removal effect of the artificial wetland on nitrogen-containing pollutants is poor at present, researchers at home and abroad carry out a series of researches on the enhanced denitrification process of the artificial wetland, for example, a denitrification enhancer capable of enhancing the activities of nitrobacteria and denitrifying bacteria in indigenous microorganisms is developed according to the requirements of the microorganisms in the artificial wetland on nutrients; artificial aeration is adopted to increase the dissolved oxygen distribution of the system; the denitrification effect of the system is improved by the horizontal flow-vertical flow-horizontal flow wetland series system. But the denitrification effect is not obvious by the measures, and the investment cost of the wetland system can be greatly increased by the mode of serially constructing a plurality of artificial wetlands.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide an artificial wetland enhanced denitrification device and process suitable for northern cold regions.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an artificial wetland strengthens denitrification device and technology suitable for cold area in north, includes rectifying area 17, and rectifying area 17 is equipped with a plurality of guide plates 3 through perforating the wall 18 of flowers evenly intaking in it along the width direction, has laid big resistance distribution pipe 4 and aerated conduit 5 in rectifying area 17's bottom, and big resistance distribution pipe 4 sets up in rectifying area 17 front portion, and aerated conduit 5 sets up at rectifying area's well, rear portion. The effluent of the rectifying area 17 is connected with the artificial wetland 19 through a perforated tracery wall. Part of the effluent of the artificial wetland 19 flows back to the front end of the rectifying area 17 through the high-resistance water distribution pipeline 4, and aeration is carried out on the middle part and the rear part of the rectifying area 17 so as to enhance the denitrification effect of the artificial wetland in northern cold areas.
The flow guide plates 3 are uniformly distributed in the rectifying area 17 along the width, the rectifying area 17 is divided into a plurality of subunits uniformly, and the length-width ratio of each rectifying subarea is controlled to be more than or equal to 4.
The large-resistance water distribution pipeline 4 and the aeration pipeline 5 are both composed of a layer of horizontally laid pipeline and a layer of vertical pipeline, and the vertical pipeline is vertically communicated with the horizontally laid pipeline.
The large-resistance water distribution pipeline 4 is provided with a plurality of branch pipes, the flow speed of the starting ends of the branch pipes is 1.5-2.5 m/s, the distance between the branch pipes is 200-300 mm, the aperture of each branch pipe is 9-12 mm, and the hole distance is 75-300 mm.
The aeration pipeline 5 is a perforated aeration pipe and is provided with a plurality of branch pipes, the diameter of the perforated pipe is 3mm, the hole distance is 70mm, the pipe diameters of the branch pipes are 20mm, the space between the branch pipes is 80mm, the branch pipes are arranged in a branch shape, the orifices are inclined downwards by 45 degrees, and the rectifying unit 17 is in an oxygen-enriched state so as to realize the purpose that ammonia nitrogen in sewage is oxidized into nitrate nitrogen.
The artificial wetland 19 structurally comprises wetland plants 16, a soil covering layer 15, a sponge layer 14, a medium-particle-size gravel matrix layer 13, a large-particle-size gravel matrix layer 12 and an impermeable layer 2 from top to bottom, and the rectifying area 17 is communicated with the artificial wetland 19 through a perforated tracery wall 18.
The water outlet of the artificial wetland 19 is positioned at the lower part of the gravel matrix layer 12, part of the water is directly discharged through the three-way valve 11, and the other part of the water flows back to the front end of the rectifying area 17 through the high-resistance water distribution pipeline 4.
The large-resistance water distribution pipeline 4 is communicated with a water pump 10, the aeration pipeline 5 is communicated with an aeration pump 6, the water pump 10 and the aeration pump 6 depend on the solar cell panel 7 for supplying energy in the daytime and depend on the storage battery 9 for supplying energy at night. The photovoltaic pumping inverter 8 converts direct current generated by the solar panel array into alternating current to drive the water pump 10, and adjusts output frequency in real time according to the change of sunlight intensity, so that the output power is close to the maximum power of the solar panel array.
Correspondingly, the flow guide plates 3 are uniformly distributed in the rectifying area 17 along the width to optimize the water flow state, the water outlet part of the artificial wetland is refluxed to the front end of the rectifying area 17, and aeration is carried out at the middle section and the rear section of the rectifying area 17.
Compared with the prior art, the invention has the beneficial effects that:
1. in the aeration environment of the middle and the rear section of the rectification area, ammonia nitrogen in the sewage is oxidized into nitrate nitrogen by microorganisms; different from the traditional reflux mode, the process of the invention is to reflux part of the effluent of the artificial wetland with ammonia nitrogen to the rectification area in the aerobic environment, break through the technical bottleneck that the artificial wetland has low oxidation efficiency of ammonia nitrogen in sewage in the low-temperature environment, and improve the total ammonia oxidation efficiency of the system.
2. The large-resistance water distribution pipeline and the aeration device at the bottom of the rectifying area can generate severe disturbance to sewage while supplying water and aerating to the rectifying area, so that the freezing phenomenon of the system in cold environment in winter can be effectively avoided; meanwhile, the gravel filler which is paved in the rectifying area and wrapped by the asphalt can absorb solar energy to the maximum extent, maintain the temperature of sewage in the rectifying area and ensure the oxidation efficiency of ammonia nitrogen under the action of aeration.
3. Compared with the traditional process, the constructed wetland unit is structurally provided with a thicker soil covering layer and a thicker sponge layer, has the functions of heat preservation and freeze prevention, and also has the function of inhibiting oxygen from being transferred to the subsurface flow wetland matrix, thereby ensuring that the inside of the constructed wetland matrix has a more ideal anoxic environment and proper water temperature, and ensuring the denitrification efficiency of the system.
4. The process of the invention can simplify the area occupied by the traditional tandem wetland process by utilizing the reflux process, thereby realizing the optimization of the denitrification performance and greatly reducing the construction cost.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a top view of fig. 1.
1. Gravel filler wrapped by asphalt, 2 parts of an impermeable layer, 3 parts of a guide plate, 4 parts of a high-resistance water distribution pipeline, 5 parts of an aeration pipe, 6 parts of an aeration pump, 7 parts of a solar cell panel, 8 parts of a photovoltaic water pumping inverter, 9 parts of a storage battery, 10 parts of a water pump, 11 parts of a three-way valve, 12 parts of a large-particle-size gravel matrix layer, 13 parts of a medium-particle-size gravel matrix layer, 14 parts of a sponge layer, 15 parts of a covering soil layer, 16 parts of wetland plants, 17 parts of a rectifying area, 18 parts of a perforated wall and 19 parts of an artificial wetland.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in figures 1 and 2, the reflux type denitrification strengthening device for the artificial wetland in the cold region comprises a rectifying area 17, wherein a plurality of flow deflectors 3 are arranged in the rectifying area 17 along the width direction, the rectifying area 17 is divided into a plurality of sub-areas, and the aspect ratio of each rectifying sub-area is controlled to be more than or equal to 4. Gravel filler 1 which is coated by asphalt and has the particle size of 1-2 cm is filled between the guide plates 2.
The bottom of the rectifying area 17 is paved with a large-resistance water distribution pipeline 4 and an aeration pipeline 5, wherein the large-resistance water distribution pipeline 4 is arranged at the front part of the rectifying area 17, and the aeration pipeline 5 is arranged at the middle and rear parts of the rectifying area 17.
The large-resistance water distribution pipeline 4 and the aeration pipeline 5 are both composed of a layer of horizontally laid pipeline and a layer of vertical pipeline, and the vertical pipeline is vertically communicated with the horizontally laid pipeline.
Wherein, the large resistance water distribution pipeline 4 is provided with a plurality of branch pipes, the flow velocity at the starting end of each branch pipe is 1.5-2.5 m/s, the distance between the branch pipes is 200-300 mm, the aperture of each branch pipe is 9-12 mm, and the pitch is 75-300 mm.
The aeration pipeline 5 is a perforated aeration pipe and is provided with a plurality of branch pipes, the diameter of the perforated pipe is 3mm, the hole distance is 70mm, the pipe diameters of the branch pipes are 20mm, the space between the branch pipes is 80mm, the branch-shaped aeration pipe is arranged in a branch shape, an orifice is downwards inclined by 45 degrees, and the rectifying unit 17 is in an oxygen-enriched state so as to realize the purpose of oxidizing ammonia nitrogen in return water into nitrate nitrogen. The plurality of branch pipes of the large-resistance water distribution pipe 4 and the aeration pipe 5 are uniformly distributed in the respective areas.
The artificial wetland 19 comprises wetland plants 16, a soil covering layer 15, a sponge layer 14, a medium-particle-size matrix layer 13, a large-particle-size gravel matrix layer 12 and an impermeable layer 2 from top to bottom, and the rectifying unit 17 is communicated with the artificial wetland 19 through a perforated tracery wall 18 positioned at the middle upper part.
The water outlet of the artificial wetland 19 is positioned at the lower part of the large-particle-size gravel matrix layer 12, part of the water is directly discharged and discharged into the surface water body through the three-way valve 11, and the other part of the water flows back to the rectifying area 17 through the large-resistance water distribution pipeline 4 for secondary treatment, so that the removal effect of the system on nitrogen-containing pollutants is further improved.
The specific principle of the process of the invention is as follows: the effluent of the artificial wetland contains certain residual nitrogen-containing pollutants, and after a part of effluent is refluxed to a rectification area and mixed and diluted with source water, ammonia nitrogen is subjected to nitration reaction under the action of aeration and oxygenation to form nitrate radicals. And the disturbance effect of the large-resistance water distribution (return water) and aeration device in the rectifying area on the water body can realize the anti-freezing effect of the water body in winter in northern cold areas, wherein the surface of the distributed gravel filler is coated with a layer of blackThe colored asphalt can transfer heat to the water body by heat absorption in daytime so as to further improve the anti-freezing effect of the water body in cold regions. The water body treated by the rectifying area enters an artificial wetland unit (anoxic environment), and the denitrifying bacteria reduce nitrate radicals into N by taking nitrogen-containing organic matters which are not decomposed in the water as carbon sources2And released. The covering soil layer and the sponge layer on the upper part of the artificial wetland have the functions of heat preservation and freeze prevention, and also have the function of inhibiting oxygen from being transferred to the subsurface wetland matrix, thereby ensuring that the inside of the substrate of the artificial wetland has more ideal anoxic environment and proper water temperature, and ensuring the denitrification efficiency of the system. In conclusion, the process disclosed by the invention realizes the reinforced removal of nitrogen of the artificial wetland in the cold region on the whole, and effectively saves the floor area and the energy consumption of the artificial wetland.
Claims (10)
1. The utility model provides an artificial wetland denitrification enhancement device suitable for northern cold areas, including rectifying area (17), rectifying area (17) are evenly intake through perforation tracery wall (18), its inside is equipped with a plurality of guide plates (3) along width direction, laid big resistance water distribution pipeline (4) and aeration pipeline (5) in the bottom of rectifying area (17), big resistance water distribution pipeline (4) set up in rectifying area (17) front portion, aeration pipeline (5) set up at the well of rectifying area (17), rear portion, rectifying unit (17) play water is connected with artificial wetland (19) through perforation tracery wall, go out water of artificial wetland (19) and partly flow back to rectifying area (17) front end through big resistance water pipeline (4) to carry out the aeration to the middle of rectifying area (17), rear portion.
2. The constructed wetland enhanced denitrification device suitable for the northern cold areas as recited in claim 1, wherein the flow guide plates (3) are uniformly distributed in the rectifying area (17) along the width direction, the rectifying area (17) is divided into a plurality of sub-areas, and the aspect ratio of each rectifying sub-area is controlled to be not less than 4.
3. The constructed wetland enhanced denitrification device suitable for the northern cold regions is characterized in that gravel fillers (1) which are coated by asphalt and have the particle size of 1-2 cm are filled between the flow deflectors (3) of the rectifying region (17).
4. The constructed wetland enhanced denitrification device suitable for northern cold regions according to claim 1, wherein the high-resistance water distribution pipeline (4) and the aeration pipeline (5) are both composed of a layer of horizontally laid pipeline and a layer of vertical pipeline, and the vertical pipeline is vertically communicated with the horizontally laid pipeline.
5. The constructed wetland enhanced denitrification device suitable for northern cold regions according to claim 1 or 4, wherein the high-resistance water distribution pipeline (4) is provided with a plurality of branch pipes, the flow velocity of the starting end of each branch pipe is 1.5-2.5 m/s, the distance between every two branch pipes is 200-300 mm, the aperture of each branch pipe is 9-12 mm, and the hole pitch is 75-300 mm.
6. The constructed wetland enhanced denitrification device suitable for northern cold regions according to claim 1 or 4, characterized in that the aeration pipeline (5) is a perforated aeration pipe, and is provided with a plurality of branch pipes, wherein the diameter of the perforation is 3mm, the hole pitch is 70mm, the pipe diameters of the branch pipes are 20mm, the spacing between the branch pipes is 80mm, the branch pipes are arranged in a tree shape, the hole openings are inclined downwards by 45 degrees, so that the rectification unit (17) is in an oxygen-enriched state to realize the purpose of oxidizing ammonia nitrogen in return water into nitrate nitrogen.
7. The constructed wetland enhanced denitrification device applicable to northern cold regions according to claim 1, wherein the constructed wetland (19) structure comprises wetland plants (16), a soil covering layer (15), a sponge layer (14), a medium-particle-size gravel matrix layer (13), a large-particle-size gravel matrix layer (12) and an impermeable layer (2) from top to bottom, and the rectifying area (17) is communicated with the constructed wetland (19) through a perforated tracery wall (18).
8. The constructed wetland enhanced denitrification device suitable for the northern cold regions is characterized in that the water outlet of the constructed wetland (19) is positioned at the lower part of the large-particle-size gravel matrix layer (12), part of the water flows out directly through the three-way valve (11), and part of the water flows back to the front end of the rectifying area (17) through the water distribution pipeline (4).
9. The constructed wetland enhanced nitrogen removal device suitable for northern cold areas according to claim 8, wherein the high-resistance water distribution pipeline (4) is communicated with a water pump (10), the aeration pipeline (5) is connected with an aeration pump (6), the water pump (10) and the aeration pump (6) are powered by a solar cell panel (7) in the daytime and a storage battery (9) at night. .
10. The enhanced nitrogen removal process of the artificial wetland enhanced nitrogen removal device suitable for the northern cold regions is characterized in that a plurality of flow guide plates (3) are uniformly arranged in the rectifying region (17) along the width direction to optimize the water flow state, the water outlet part of the artificial wetland (19) flows back to the front end of the rectifying region (17), and the water body is aerated in the middle and rear sections of the rectifying region (17).
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| CN202010020451.7A CN111115817B (en) | 2020-01-09 | 2020-01-09 | Artificial wetland enhanced denitrification device and process suitable for northern cold areas |
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| CN202010020451.7A CN111115817B (en) | 2020-01-09 | 2020-01-09 | Artificial wetland enhanced denitrification device and process suitable for northern cold areas |
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| CN111115817B CN111115817B (en) | 2021-07-06 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998058881A1 (en) * | 1997-06-23 | 1998-12-30 | Wallace Scott D | Method and apparatus for biological treatment of waste water |
| CN101898856A (en) * | 2010-08-06 | 2010-12-01 | 中国矿业大学(北京) | Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof |
| CN104129857A (en) * | 2014-07-29 | 2014-11-05 | 青海省环境科学研究设计院 | High-cold region reclaimed water deep-purification constructed wetland system |
| CN104761057A (en) * | 2015-03-25 | 2015-07-08 | 山东大学 | Biological carbon modular composite vertical-flow artificial wetland system |
-
2020
- 2020-01-09 CN CN202010020451.7A patent/CN111115817B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998058881A1 (en) * | 1997-06-23 | 1998-12-30 | Wallace Scott D | Method and apparatus for biological treatment of waste water |
| CN101898856A (en) * | 2010-08-06 | 2010-12-01 | 中国矿业大学(北京) | Subsurface flow constructed wetland system of secondary effluent from sewage treatment plant and application thereof |
| CN104129857A (en) * | 2014-07-29 | 2014-11-05 | 青海省环境科学研究设计院 | High-cold region reclaimed water deep-purification constructed wetland system |
| CN104761057A (en) * | 2015-03-25 | 2015-07-08 | 山东大学 | Biological carbon modular composite vertical-flow artificial wetland system |
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