CN114506972A - Ecological purification system for residual water of dredged soil - Google Patents
Ecological purification system for residual water of dredged soil Download PDFInfo
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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
- C02F9/00—Multistage treatment of water, waste water or sewage
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/28—Treatment of water, waste water, or sewage by sorption
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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
- C02F1/00—Treatment of water, waste water, or sewage
- C02F2001/007—Processes including a sedimentation step
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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
- C02F2101/105—Phosphorus compounds
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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
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/38—Organic compounds containing nitrogen
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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
Abstract
The invention relates to an ecological purification system for dredged soil and residual water, which comprises a precipitation device and a combined subsurface flow constructed wetland, wherein the precipitation device is used for precipitating particles in the dredged soil and residual water, the combined subsurface flow constructed wetland comprises a filtering unit and a horizontal subsurface flow constructed wetland unit, the filtering unit comprises a filtering tank, filtering materials filled in the filtering tank and a water inlet pipe for connecting the filtering tank and the precipitation device, the horizontal subsurface flow constructed wetland unit comprises a wetland tank, a matrix filled in the wetland tank and aquatic plants planted in the matrix, a communicating pipeline is arranged between the wetland tank and the filtering tank, the communicating pipeline is positioned on the upper surface of the filtering materials and below the upper surface of the matrix, and a water outlet pipe is also arranged on the wetland tank. The invention purifies the dredged soil and residual water by utilizing ecological modes such as precipitation, wetland purification and the like, has the advantages of low cost, ecological environmental protection, environmental protection and the like, and provides a new technical approach for treating the dredged soil and residual water.
Description
Technical Field
The invention relates to the field of environmental ecological engineering and dredging engineering, in particular to an ecological purification system for dredging soil and residual water.
Background
Ecological dredging is an important engineering technical measure for reducing the endogenous pollution load of the sediment of the water body and obviously controlling the endogenous pollution effect of the water body. In the dredging process, the polluted bottom mud is sucked into slurry by a dredging ship in a twisting way, and the slurry is conveyed to a mud discharge field through a mud conveying pipeline to be solidified. Solid particles in the slurry are naturally precipitated and then are retained in a sludge discharge field, and the excess water overflows from the sludge discharge field and is discharged, so that the sludge is called as dredged water. The solid content of the slurry is only 15 percent generally, so that a large amount of dredged soil residual water is generated in the dredging and solidifying process. Because the polluted bottom mud in dredging is broken by the reamer head, the release of pollutants is enhanced, and the residual water contains a large amount of pollutants such as organic matters, nitrogen, phosphorus, heavy metals and the like which are rich in the bottom mud, most of the pollutants are attached to fine particles and suspended in the residual water, and the pollutants are difficult to settle. Therefore, necessary measures are required to purify the residual water and then discharge the purified residual water.
At present, the water quality purification method for treating the residual water of the dredged soil comprises various methods such as physical, chemical, ecological, mechanical and the like, and the various methods have the technical characteristics as follows: (1) physical methods. The method is characterized in that the method treats and controls the residual water in a physical precipitation mode, generally emphasizes the form of a water return port, increases the capacity of a sludge discharge field, prolongs the water return path and the like on the environmental protection measures of the dredging engineering. Generally, the effect is better in the early stage and the middle stage of construction, the investment cost is low, and the maintenance is easy; in the later construction period, because the volume of the sludge discharge field is reduced, the content of suspended matters in the discharged residual water is increased, the control difficulty is increased, the effect is weakened, and the influence on the peripheral area is increased; (2) chemical method. The flocculant is added into the slurry water to accelerate the separation of mud and water and the sedimentation of silt, so that the residual water discharge index can meet the discharge requirement, and the method is the most common method for removing suspended matters in water at home and abroad at present. The flocculation precipitation method has the advantages of no need of power, large operation flexibility, strong adaptability to water quality and water quantity change, convenient medicament supply, small floor area of treatment facilities, easy construction of simple facilities and low cost. The method has the disadvantages that the flocculating agent is a chemical reagent, the feeding cost is high, and the risk of secondary pollution caused by discharging the chemical reagent into a water body exists. (3) The mechanical method is characterized in that residual water is treated and controlled in a mechanical mode, mud water is evaporated and discharged by a machine, and residues are compacted. Has the advantages of reduced occupied cultivated land area, small influence on the growth of the normal bacteria and environmental protection. However, for a large amount of earthwork in the dredging project, the method needs more machines, has long period, high efficiency and low cost, and is not suitable for being adopted.
Disclosure of Invention
In view of the above disadvantages of the prior art, the present invention provides an ecological purification system for dredging soil and residual water, which utilizes ecological modes such as precipitation and wetland purification to purify the dredging soil and residual water, has the advantages of low cost, ecological environmental protection, and the like, and provides a new technical approach for treating the dredging soil and residual water.
In order to achieve the purpose, the invention provides an ecological purification system for dredged soil and residual water, which comprises a precipitation device and a combined subsurface flow constructed wetland, wherein the precipitation device is used for precipitating particles in the dredged soil and residual water, the combined subsurface flow constructed wetland comprises a filtering unit and a horizontal subsurface flow constructed wetland unit, the filtering unit comprises a filtering tank, filtering materials filled in the filtering tank and a water inlet pipe for connecting the filtering tank with the precipitation device, the horizontal subsurface flow constructed wetland unit comprises a wetland tank, substrates filled in the wetland tank and aquatic plants planted in the substrates, a communicating pipeline is arranged between the wetland tank and the filtering tank, the communicating pipeline is positioned on the upper surface of the filtering materials and below the upper surface of the substrates, and a water outlet pipe is also arranged on the wetland tank.
Further, the communicating pipe is respectively connected to the bottoms of the wetland tank and the filtering tank, and the water outlet of the water inlet pipe is positioned above the surface of the filtering material.
Furthermore, the filtering unit also comprises a plurality of water distribution pipes connected with the water inlet pipe, and the water outlets of the water distribution pipes are distributed on the filtering material.
Furthermore, the substrate of the horizontal subsurface flow constructed wetland unit comprises one or more of sand, gravel, ceramsite, anthracite, zeolite and granular activated carbon
Further, the aquatic plant includes an emergent aquatic plant.
Further, the parameters of the horizontal subsurface flow constructed wetland unit comprise: hydraulic load less than 0.1m3/m2And d, the hydraulic retention time is 4-8 d.
Further, the total parameters of the combined subsurface flow constructed wetland comprise: hydraulic load less than 1.0m3/m2And d, the hydraulic retention time is 1-3 d, and the water depth is 0.4-1.6 m.
Furthermore, the sedimentation equipment comprises a sedimentation drainage channel and a reinforced sedimentation tank, wherein an upstream inlet of the sedimentation drainage channel is used for dredging the residual water of the soil to enter, a downstream outlet of the sedimentation drainage channel is communicated with the reinforced sedimentation tank, and an outlet of the reinforced sedimentation tank is connected with a water inlet pipe.
Further, the design parameters of the sedimentation drainage canal include: the length of the channel is more than or equal to 1000m, the width of the channel is 1-10 m, the depth of the channel is 0.5-2.5 m, and the hydraulic retention time is 0.5-3 d; the design parameters of the reinforced sedimentation tank comprise: the hydraulic retention time is 1-7 d, and the water depth is 1-5 m
Further, it is characterized in that: the wetland system also comprises a surface flow constructed wetland, and the surface flow constructed wetland is communicated with the upper water outlet pipe of the wetland pool.
As described above, the ecological purification system according to the present invention has the following advantages:
through setting up the precipitation equipment, and combination formula undercurrent constructed wetland, during the use, the surplus water of dredging soil carries out physical precipitation through the precipitation equipment earlier, let the granule suspended solid deposit among them, then enter into combination formula undercurrent constructed wetland again, and in order to carry out purification treatment through filter unit and horizontal undercurrent constructed wetland unit in proper order, further adsorb difficult suspended solid that subsides through filtering material in the filtering ponds, in the wetland pond, with horizontal flow mode through the matrix, the surplus water of dredging soil slowly flows in the matrix, on the one hand the matrix plays certain filtering action, on the other hand, through planting in the aquatic plant's of matrix growth carry out the nitrogen phosphorus material in the purification water, realize the dephosphorization of denitriding, further promote quality of water. The invention purifies the dredged soil and residual water by utilizing ecological modes such as precipitation, wetland purification and the like, has the advantages of low cost, ecological environmental protection, environmental protection and the like, and provides a new technical approach for treating the dredged soil and residual water.
Drawings
Fig. 1 is a schematic structural view of an ecological purification system of the present invention.
Fig. 2 is a structural schematic diagram of the combined subsurface flow constructed wetland in the invention.
Description of the element reference numerals
1 row mud field
2 sedimentation drainage canal
3 strengthening sedimentation tank
4 combined subsurface flow constructed wetland
41 filtering pool
42 filter material
43 water inlet pipe
44 water distribution pipe
45 communicating pipeline
46 wetland pool
47 matrix
48 emerging plant
49 outlet pipe
5 surface flow constructed wetland
Detailed Description
The following description of the embodiments of the present invention is provided for illustrative purposes, and other advantages and effects of the present invention will become apparent to those skilled in the art from the present disclosure.
It should be understood that the structures, proportions, and dimensions shown in the drawings and described herein are for illustrative purposes only and are not intended to limit the scope of the present invention, which is defined by the claims, but rather by the claims. In addition, the terms such as "upper", "lower", "left", "right" and "middle" used in the present specification are for convenience of description only, and are not intended to limit the scope of the present invention, and changes or modifications of the relative relationship thereof may be regarded as the scope of the present invention without substantial changes in the technical contents.
Referring to fig. 1 and 2, the invention provides an ecological purification system for dredged soil and residual water, which comprises a precipitation device and a combined subsurface flow constructed wetland 4, wherein the precipitation device is used for precipitating particulate matters in the dredged soil and residual water, the combined subsurface flow constructed wetland 4 comprises a filtering unit and a horizontal subsurface flow constructed wetland unit, the filtering unit comprises a filtering pond 41, a filtering material 42 filled in the filtering pond 41, and a water inlet pipe 43 connecting the filtering pond 41 and the precipitation device, the horizontal subsurface flow constructed wetland unit comprises a wetland pond 46, a substrate 47 filled in the wetland pond 46, and aquatic plants planted in the substrate 47, a communicating pipeline 45 is arranged between the wetland pond 46 and the filtering pond 41, the communicating pipeline 45 is positioned on the upper surface of the filtering material 42 and below the upper surface of the substrate 47, and a water outlet pipe 49 is also arranged on the wetland pond 46.
The basic working principle of the ecological purification system provided by the invention is as follows: when in use, referring to fig. 1, the dredged soil residual water from the sludge discharge field 1 is physically precipitated by a precipitation device to precipitate particle suspended matters in the dredged soil residual water, then enters the combined subsurface flow constructed wetland 4 and is purified by sequentially passing through a filtering unit and a horizontal subsurface flow constructed wetland unit, specifically, the dredged soil residual water enters a filtering tank 41 through a water inlet pipe 43, the hydraulic retention time of the dredged soil residual water in the filtering tank 41 is set according to needs, and the suspended matters which are difficult to precipitate are further adsorbed by a filtering material 42; then the dredged soil residual water enters the wetland tank 46 through the communication pipeline 45, passes through the substrate 47 in a horizontal flow mode, and sets the hydraulic retention time of the dredged soil residual water in the wetland tank 46 according to the requirement, the dredged soil residual water slowly flows in the substrate 47, on one hand, the substrate 47 plays a certain role in filtration, on the other hand, nitrogen and phosphorus substances in the water are purified through the growth of aquatic plants planted in the substrate 47, the nitrogen and phosphorus removal is realized, and the water quality is further improved.
The ecological purification system of the invention adopts ecological modes such as natural sedimentation, wetland purification and the like to purify the dredged soil and residual water, has the advantages of low cost, ecological environmental protection, environmental protection and the like, and provides a new technical approach for the treatment of the dredged soil and residual water.
In this embodiment, referring to fig. 1 and 2, as a preferred design, the communication pipe 45 is connected to the bottom of the wetland tank 46 and the filtration tank 41 respectively, and the water outlet of the water inlet pipe 43 is located on the surface of the filtration material 42, so that the residual water of the dredging soil vertically flows downwards in the filtration tank 41 and passes through the filtration material 42, the filtration effect is better, and then enters the bottom of the wetland tank 46 from the bottom, the residual water can better flow through the substrate 47 in the wetland tank 46, and the purification effect is better. Further, the filter unit further comprises a plurality of water distribution pipes 44 connected to the water inlet pipe 43, the water outlets of the water distribution pipes 44 are distributed on the filter material 42, and the water distribution pipes 44 function to enable the incoming residual water of the dredging soil to be distributed on the surface of the filter material 42, so as to improve the filtering effect.
In the embodiment, referring to fig. 1 and 2, the depths of the wetland tank 46 and the filtration tank 41 can be set as required, and in the embodiment, the depths of both tanks are 0.5 to 1.8 m. As a preferable design, the filtering material 42 in the filtering unit comprises sand grains, and the grain size of the sand grains is 0.02-2 mm. Of course, in other embodiments, other suitable materials for the filter material 42 may be used.
In the present embodiment, referring to fig. 1 and 2, as a preferred design, the horizontal subsurface flow constructed wetland unit matrix 47 comprises one or more of sand, gravel, ceramsite, anthracite, zeolite and granular activated carbon, and is required to be used for aquatic plant growth. In this embodiment, the aquatic plants include emergent aquatic plants 48 with developed root systems and good purification effects, and the emergent aquatic plants 48 may be one or more plants selected from reed, giant reed, canna, iris, calamus, cattail, pinus parviflora and saxifrage. Preferably, the design parameters of the horizontal subsurface flow constructed wetland unit comprise: hydraulic load less than 0.1m3/m2And d, the hydraulic retention time is 4-8 d. The total design parameters of the combined subsurface flow constructed wetland 4 comprise: hydraulic load less than 1.0m3/m2D, the hydraulic retention time is 1-3 d, and the water depth is 0.4-1.6 m. Of course, the aquatic plants may be plants of other suitable species, and may also include submerged plants.
In the present embodiment, referring to fig. 1 and 2, the sedimentation equipment includes a sedimentation drainage channel 2 and an enhanced sedimentation tank 3, the sedimentation drainage channel 2 is a strip-shaped long channel, an upstream inlet of the sedimentation drainage channel is connected with a mud discharging tank and used for dredging the residual water, a downstream outlet of the sedimentation drainage channel is communicated with the enhanced sedimentation tank 3, an outlet of the enhanced sedimentation tank 3 is connected with a water inlet pipe 43, and the dredging residual water can be lifted from the enhanced sedimentation tank 3 to the filtering unit by a pump. The dredged soil residual water firstly passes through the sedimentation drainage channel 2 to carry out preliminary sedimentation on coarse particles in the dredged soil residual water, and then enters the reinforced sedimentation tank 3 to carry out reinforced sedimentation on small-particle-size suspended matters in the dredged soil residual water. Further, the design parameters of the sedimentation drainage canal 2 include: the length of the channel is more than or equal to 1000m, the width of the channel is 1-10 m, the depth of the channel is 0.5-2.5 m, and the hydraulic retention time is 0.5-3 d. The shape of the strengthening sedimentation tank 3 can be determined according to local conditions, and the design parameters comprise: the hydraulic retention time is 1-7 d, and the water depth is 1-5 m. Of course, in other embodiments, other suitable facilities may be used in the precipitation apparatus.
In the present embodiment, as a preferred design, referring to fig. 1 and fig. 2, the ecological purification system further includes a surface flow constructed wetland 5, and the surface flow constructed wetland 5 is communicated with an upper water outlet pipe 49 of a wetland tank 46, in the present application, the surface flow constructed wetland 5 refers to a wetland in which water flows from the surface layer of a substrate, and can be constructed by building naturally or artificially excavated river channels, lakes, ponds, ditches and the like, and building original river channels through water system communication, terrain remodeling and aquatic plant community construction. After being purified by the combined type undercurrent artificial wetland 4, the sewage passes through the surface flow artificial wetland 5, and pollutants are removed under the combined action of microorganisms on the surfaces of plants and media, so that the functions of deep purification and running water are achieved, and the water quality is further improved. In this embodiment, the design parameters of the surface flow constructed wetland 5 include: hydraulic load less than 0.1m3/m2And d, the hydraulic retention time is 4-8 d.
The invention is further illustrated below by means of a specific example:
in this embodiment, the amount of the treated water of the dredged soil residual water of the ecological purification system is 1.8 km3And d. The water quality of the dredged soil residual water discharged from the sludge discharge field 1 is as follows: the SS content is 200 mg/L; TP content 0.4 mg/L; the TN content is 8 mg/L; the COD content was 80 mg/L.
The sedimentation drainage canal 2 is constructed by communicating an existing canal with a part of excavation. The specific design parameters are as follows: the length of the channel is more than or equal to 1500m, the width of the channel is 6m, the depth of the channel is 2.0m, and the hydraulic retention time is 1.0 d. The water quality of the effluent of the sedimentation drainage channel 2 is as follows: the SS content is 120mg/L, and the removal rate is 40 percent; TP content is 0.28mg/L, and removal rate is 30%; the TN content is 5mg/L, and the removal rate is 38%; COD content 60mg/L, removal rate 25%.
The strengthening sedimentation tank 3 is built by utilizing the original pond and locally excavatingThe method is characterized by comprising the following specific design parameters: area of 1.8 ten thousand meters2The hydraulic retention time is 2.0d, and the water depth is 2 m. The quality of the effluent of the strengthening sedimentation tank 3 is as follows: the SS content is 60mg/L, and the removal rate is 50 percent; TP content is 0.18mg/L, and removal rate is 35%; the TN content is 3mg/L, and the removal rate is 40%; COD content 45mg/L, removal rate 25%.
The combined subsurface flow constructed wetland 4 consists of a filtering unit and a horizontal subsurface flow constructed wetland unit, the area ratio of the filtering unit to the horizontal subsurface flow constructed wetland unit is 1:9, and the depth of the pool body is 1.2 m. And sand grains with the grain diameter of 1-2 mm are filled in the filtering unit, and sand grains and gravels are filled in the horizontal subsurface flow constructed wetland unit. Emergent aquatic plants 48 such as reed, canna, iris, cattail, windmill grass and the like are planted on the horizontal subsurface flow constructed wetland unit substrate 47, and the specific design parameters are as follows: area of 3.6 ten thousand meters2The hydraulic retention time is 2.0d, and the water depth is 1 m. The water quality of the effluent of the combined subsurface flow constructed wetland 4 is as follows: the SS content is 20mg/L, and the removal rate is 67%; TP content is 0.08mg/L, and removal rate is 56%; the TN content is 1.5mg/L, and the removal rate is 50 percent; COD content 25mg/L, removal rate 44%.
The surface flow constructed wetland 5 is constructed by performing water system communication, terrain remodeling and aquatic plant community construction on the original riverway. The specific design parameters are as follows: the area is more than or equal to 30 ten thousand meters2The hydraulic retention time is more than or equal to 8.0 d. The quality of the effluent of the surface flow artificial wetland 5 is as follows: the SS content is 10mg/L, and the removal rate is 50 percent; TP content is 0.05mg/L, and removal rate is 38%; the TN content is 1mg/L, and the removal rate is 33%; COD content 20mg/L, removal rate 20%.
After the residual water of the dredged soil is treated by the treatment process of 'sedimentation drainage channel 2 → intensified sedimentation tank 3 → combined type undercurrent artificial wetland 4 → surface current artificial wetland 5', the effluent can reach the quality of surface water III.
As can be seen from the above, the ecological purification system for the dredged soil and residual water in the embodiment provides a method for treating the dredged soil and residual water by using an ecological method, and compared with other methods for dredging soil and residual water, the method has the following advantages: 1. compared with the conventional physical precipitation method, the method is not influenced by the reduction of the volume of the sludge discharge field, the purification effect of the residual water is good, and the quality of the effluent is stable; 2. compared with a chemical method, the method has the advantages that no chemical reagent is added, the operation cost is low, the method is green and safe, ecological and environment-friendly, and the risk of secondary pollution caused by the discharge of the chemical reagent into a water body is avoided; 3. compared with a mechanical method, the method has the advantages of less required machinery, high efficiency and low operation cost.
In conclusion, the present invention effectively overcomes various disadvantages of the prior art and has high industrial utilization value.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which may be made by those skilled in the art without departing from the spirit and scope of the present invention as defined in the appended claims.
Claims (10)
1. The ecological purification system for the dredged soil residual water is characterized in that: comprises a precipitation device and a combined subsurface flow constructed wetland (4), wherein the precipitation device is used for precipitating the particles in the dredged soil residual water, the combined subsurface flow constructed wetland (4) comprises a filtering unit and a horizontal subsurface flow constructed wetland unit, the filtering unit comprises a filtering tank (41), a filtering material (42) filled in the filtering tank (41), and a water inlet pipe (43) connecting the filtering tank (41) and the sedimentation equipment, the horizontal subsurface flow constructed wetland unit comprises a wetland tank (46), a substrate (47) filled in the wetland tank (46) and aquatic plants planted in the substrate (47), a communicating pipeline (45) is arranged between the wetland tank (46) and the filtering tank (41), and the communicating pipeline (45) is positioned below the upper surface of the filtering material (42) and the upper surface of the substrate (47), and a water outlet pipe (49) is also arranged on the wetland tank (46).
2. The ecological purification system of claim 1, wherein: the communicating pipeline (45) is respectively connected to the bottom of the wetland tank (46) and the bottom of the filtering tank (41), and the water outlet of the water inlet pipe (43) is positioned above the surface of the filtering material (42).
3. The ecological purification system of claim 2, wherein: the filtering unit also comprises a plurality of water distribution pipes (44) connected with the water inlet pipe (43), and the water outlets of the water distribution pipes (44) are dispersedly arranged on the filtering material (42).
4. The ecological purification system of claim 1, wherein: the substrate (47) of the horizontal subsurface flow constructed wetland unit comprises one or more of sand, gravel, ceramsite, anthracite, zeolite and granular activated carbon.
5. The ecological purification system of claim 1, wherein: the aquatic plants include emergent aquatic plants (48).
6. The ecological purification system of claim 1, wherein: the parameters of the horizontal subsurface flow constructed wetland unit comprise: hydraulic load less than 0.1m3/m2And d, the hydraulic retention time is 4-8 d.
7. The ecological purification system of claim 1, wherein: the total parameters of the combined subsurface flow constructed wetland (4) comprise: hydraulic load less than 1.0m3/m2And d, the hydraulic retention time is 1-3 d, and the water depth is 0.4-1.6 m.
8. The ecological purification system of claim 1, wherein: the sedimentation equipment comprises a sedimentation drainage channel (2) and a strengthening sedimentation tank (3), wherein an upstream inlet of the sedimentation drainage channel (2) is used for dredging the residual water of the soil to enter, a downstream outlet of the sedimentation drainage channel is communicated with the strengthening sedimentation tank (3), and an outlet of the strengthening sedimentation tank (3) is connected with a water inlet pipe (43).
9. The ecological decontamination system of claim 8, wherein: the design parameters of the sedimentation drainage canal (2) comprise: the length of the channel is more than or equal to 1000m, the width of the channel is 1-10 m, the depth of the channel is 0.5-2.5 m, and the hydraulic retention time is 0.5-3 d; the design parameters of the reinforced sedimentation tank (3) comprise: the hydraulic retention time is 1-7 d, and the water depth is 1-5 m.
10. The ecological purification system of claim 1, wherein: the wetland system also comprises a surface flow constructed wetland (5), wherein the surface flow constructed wetland (5) is communicated with a water outlet pipe (49) on the wetland pool (46).
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