CN109775883B - Method and device for reducing surface runoff phosphorus pollution of lakeshore buffer zone - Google Patents
Method and device for reducing surface runoff phosphorus pollution of lakeshore buffer zone Download PDFInfo
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- CN109775883B CN109775883B CN201910238996.2A CN201910238996A CN109775883B CN 109775883 B CN109775883 B CN 109775883B CN 201910238996 A CN201910238996 A CN 201910238996A CN 109775883 B CN109775883 B CN 109775883B
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- buffer
- soil layer
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- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 title claims abstract description 17
- 229910052698 phosphorus Inorganic materials 0.000 title claims abstract description 17
- 239000011574 phosphorus Substances 0.000 title claims abstract description 17
- 238000000034 method Methods 0.000 title claims abstract description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 73
- 239000002689 soil Substances 0.000 claims abstract description 54
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 38
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 38
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 15
- 239000010432 diamond Substances 0.000 claims abstract description 15
- 239000010865 sewage Substances 0.000 claims abstract description 15
- 238000004062 sedimentation Methods 0.000 claims abstract description 9
- 239000004927 clay Substances 0.000 claims description 20
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 claims description 7
- 239000000843 powder Substances 0.000 claims description 7
- 239000004575 stone Substances 0.000 claims description 7
- 230000007613 environmental effect Effects 0.000 abstract description 2
- 238000013508 migration Methods 0.000 abstract description 2
- 230000005012 migration Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 7
- 238000000746 purification Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 239000003344 environmental pollutant Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 231100000719 pollutant Toxicity 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 229910004298 SiO 2 Inorganic materials 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 238000012271 agricultural production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000005202 decontamination Methods 0.000 description 1
- 230000003588 decontaminative effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000012851 eutrophication Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000035558 fertility Effects 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Landscapes
- Water Treatment By Sorption (AREA)
- Treatment Of Biological Wastes In General (AREA)
Abstract
The invention discloses a method and a device for reducing phosphorus pollution of surface runoffs of a lakeshore buffer zone, belonging to the field of environmental protection; aims to provide a method and a device for effectively intercepting phosphorus in migration sewage. The method of the invention is as follows: constructing a gradient buffer pool communicated with a sewage source and a lake, and stacking a plurality of water retaining dikes in the buffer pool to form a plurality of sequentially communicated buffer areas; and paving an aluminum modified soil layer, a soil layer and a diamond layer in each buffer area. The device comprises a buffer tank and a sedimentation tank; a plurality of water retaining dikes (2) which divide the buffer pool (9) into a plurality of buffer areas are distributed in the buffer pool; adjacent buffer areas are communicated by water passing holes (3), and each buffer area is paved with a diamond layer (4), a soil layer (8) and an aluminum modified soil layer (5); the sedimentation tank (7) is communicated with the first-stage buffer area, and the water outlet pipe (1) is communicated with the last-stage buffer area. The invention has the advantage that the removal rate of phosphorus in sewage can reach more than 90 percent.
Description
Technical Field
The invention relates to a method and a device for treating water pollution, in particular to a method and a device for reducing surface runoff phosphorus pollution of a lakeshore buffer zone; belongs to the field of environmental protection.
Background
Along with the development of rural economy and agricultural production, a large amount of domestic sewage containing pollutants, cultivation wastewater, agricultural water withdrawal and the like are discharged to cause eutrophication of river and lake water bodies. At present, river basin non-point source pollution becomes an important source of water pollution, a serious threat is formed to a water ecological system, and how to effectively control agricultural non-point source pollution becomes a research focus of current water environment treatment.
At present, the treatment mode aiming at agricultural non-point source pollution mainly comprises constructed wetland purification and lakeside buffer zone purification, and the common characteristics of the two technologies are that aquatic plants are utilized to adsorb dissolved pollutants, and although the technology has good purification effect, plants can stop growing and even die in winter, the sewage treatment effect can be greatly reduced, and the requirements of sewage treatment cannot be met.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to provide a method for reducing the surface runoff phosphorus pollution of a lakeshore buffer zone, which can effectively intercept phosphorus in migration sewage.
Another object of the invention is to provide a device for implementing the above method.
In order to achieve the above object, the method of the present invention comprises the steps of:
1) Constructing a buffer pool with the bottom gradient less than or equal to 15% in the lakeshore buffer zone, and ensuring that a water inlet of the buffer pool is communicated with a sewage source and a water outlet of the buffer pool is communicated with a lake;
2) Stacking a plurality of stages of water retaining dikes in the buffer pool along the gradient direction so as to form a buffer area between adjacent water retaining dikes; water holes communicated with adjacent two-stage buffer areas are formed in each stage of water retaining dike, and the water holes on the adjacent water retaining dike are ensured to be distributed in a staggered manner along the height direction of the water retaining dike;
3) Sequentially paving a diamond layer, a soil layer and an aluminum modified soil layer at the bottom of each buffer area from bottom to top, or sequentially paving the aluminum modified soil layer, the soil layer and the diamond layer from bottom to top; ensuring the thicknesses of the diamond layer, the soil layer and the aluminum modified soil layer to be 10-20 cm respectively; the aluminum modified soil layer is formed by mixing aluminum modified clay and soil according to a weight ratio of 3:97, and the aluminum modified clay is formed by mixing clay, aluminum sulfate and stone powder with a grain size of 1-3 mm according to a weight ratio of 6:3:11. The main components of the aluminum modified clay are shown in table 1.
Table 1: main component of aluminum modified clay (%)
| SiO 2 | Al 2 O 3 | Fe 2 O 3 | MgO | CaO | Na 2 O | K 2 O | MnO | P 2 O 5 | TiO 2 | Loss |
| 26.41 | 8.40 | 0.89 | 1.64 | 26.90 | 1.82 | 0.77 | 0.01 | 0.04 | 0.10 | 33.02 |
The device comprises a buffer tank and a sedimentation tank; the bottom of the buffer pool is of a slope-shaped structure, and a plurality of stages of water retaining dikes which divide the buffer pool into a plurality of buffer areas are distributed in the buffer pool along the gradient direction; water holes for communicating the two adjacent buffer areas are formed in each water retaining dike, and the water holes in the adjacent water retaining dikes are distributed in a staggered manner along the height direction of the water retaining dike; the bottom of each buffer area is sequentially paved with a diamond layer, a soil layer and an aluminum modified soil layer from bottom to top, or is sequentially paved with an aluminum modified soil layer, a soil layer and a diamond layer from bottom to top; the sedimentation tank is communicated with the first-stage buffer area through a water diversion pipe, and the water outlet pipe is communicated with the last-stage buffer area.
The water passing holes in the device are arranged near the top or bottom of the water retaining dike; the aluminum modified soil layer in the device is formed by mixing aluminum modified clay and soil, wherein the aluminum modified clay is formed by mixing clay, aluminum sulfate and stone powder with the grain size of 1-3 mm; the thicknesses of the diamond layer, the aluminum modified soil layer and the soil layer in the device are 10-20 cm respectively.
Compared with the prior art, the invention adopts the technical scheme that the buffer pool with the gradient at the bottom is constructed in the lakeside buffer zone, the buffer pool is divided into a plurality of levels of buffer areas by the water retaining dike, and an aluminum modified soil layer formed by mixing clay, aluminum sulfate, stone powder and soil is paved in each level of buffer area, so that phosphorus in sewage runoff can be adsorbed and intercepted in a penetrating way, and pollution of agricultural non-point sources to lakes is reduced. Because the water passing holes which are arranged in a staggered manner are arranged on the adjacent water retaining dikes, the residence time of the runoff in the buffer pool can be prolonged to the greatest extent, phosphorus in the water passing holes is fully adsorbed and blocked, and the purifying effect is improved. In order to effectively utilize phosphorus in the water body, increase soil fertility and reduce comprehensive cost, an in-situ soil layer can be paved on the surface or the back of the aluminum modified soil layer.
Experiments prove that after the sewage is treated for 46 days and the surface runoff is simulated for 10 times by adopting the method and the device, the phosphorus removal rate in the simulated runoff still reaches more than 90 percent. Therefore, the method and the device not only can effectively reduce phosphorus pollution of agricultural non-point sources, but also have the advantages of long treatment duration, stable sewage interception effect and the like.
Drawings
Fig. 1 is a schematic view of the structure of the device of the present invention.
In the figure: the water treatment device comprises a water outlet pipe 1, a water retaining dike 2, a water passing hole 3, a rubble layer 4, an aluminum modified soil layer 5, a water diversion pipe 6, a sedimentation tank 7, a soil layer 8 and a buffer tank 9.
FIG. 2 is a graph comparing the effect of soil with and without the application of aluminum modified clay on treatment of simulated runoff sewage.
Detailed Description
The invention is further described with reference to the accompanying drawings and specific examples:
as shown in figure 1, a buffer pool 9 with the bottom gradient less than or equal to 15% is constructed in a lakeshore buffer zone, a water inlet of the buffer pool is communicated with a sewage source, and a water outlet of the buffer pool is communicated with a lake through a water outlet pipe 1. A plurality of water retaining dikes 2 are piled up in the buffer pool 9 along the gradient direction, and a buffer area (not shown in the figure) is formed between the adjacent water retaining dikes 2; water passing holes 3 communicated with the two adjacent stages of buffer areas are formed in each stage of water retaining dike 2, and the water passing holes 3 in the adjacent water retaining dike 2 are distributed in a staggered manner along the height direction of the water retaining dike. The bottom of each level of buffer area is sequentially paved with a rubble layer 4, a soil layer 8 and an aluminum modified soil layer 5 from bottom to top, or sequentially paved with the aluminum modified soil layer 5, the soil layer 8 and the rubble layer 4 from bottom to top. In order to ensure good treatment effect and also to achieve construction cost, the thicknesses of the rubble layer 4, the aluminum-modified soil layer 5 and the soil layer 8 are set to 10-20 cm. The aluminum modified soil layer 5 is formed by mixing aluminum modified clay and soil according to a weight ratio of 3:97, wherein the aluminum modified clay is formed by mixing clay, aluminum sulfate and stone powder with a grain size of 1-3 mm according to a weight ratio of 6:3:11.
In order to facilitate the adjustment of the flow, a sedimentation tank 7 is built at the upstream position of the buffer tank 9, the sedimentation tank is communicated with the first-stage buffer area through a water conduit 6, and the water outlet pipe 1 of the buffer tank 9 is communicated with the last-stage buffer area.
In the embodiment, the aluminum sulfate in the aluminum modified clay can effectively adsorb dissolved phosphorus and suspended particles in the water body, so that the phosphorus content in the water body is reduced, and the transparency of the water body is increased; the stone powder can loosen soil and increase the surface area, thus being beneficial to the penetration of runoff and interception of suspended particles in water; the diamond layer 4 has the function of slowing down the impact of water flow and preventing soil loss.
As can be seen from FIG. 2, the method and the device for treating sewage can achieve the removal rate of organic phosphorus in simulated runoff of more than 90%, and the decontamination effect can last for 46 days.
Claims (5)
1. A method for reducing phosphorus pollution of surface runoff of a lakeshore buffer zone is characterized by comprising the following steps:
1) Constructing a buffer pool with the bottom gradient less than or equal to 15% in the lakeshore buffer zone, and ensuring that a water inlet of the buffer pool is communicated with a sewage source and a water outlet of the buffer pool is communicated with a lake;
2) Stacking a plurality of stages of water retaining dikes in the buffer pool along the gradient direction so as to form a buffer area between adjacent water retaining dikes; water holes communicated with adjacent two-stage buffer areas are formed in each stage of water retaining dike, and the water holes on the adjacent water retaining dike are ensured to be distributed in a staggered manner along the height direction of the water retaining dike;
3) Sequentially paving a diamond layer, a soil layer and an aluminum modified soil layer at the bottom of each buffer area from bottom to top, or sequentially paving the aluminum modified soil layer, the soil layer and the diamond layer from bottom to top; ensuring the thicknesses of the diamond layer, the soil layer and the aluminum modified soil layer to be 10-20 cm respectively; the aluminum modified soil layer is formed by mixing aluminum modified clay and soil according to a weight ratio of 3:97, and the aluminum modified clay is formed by mixing clay, aluminum sulfate and stone powder with a grain size of 1-3 mm according to a weight ratio of 6:3:11.
2. An apparatus for performing the method of claim 1, wherein: comprises a buffer tank and a sedimentation tank; the method is characterized in that: the bottom of the buffer pool (9) is of a slope-shaped structure, and a plurality of stages of water retaining dikes (2) for dividing the buffer pool (9) into a plurality of buffer areas are distributed in the buffer pool along the gradient direction; the water passing holes (3) which are used for communicating the two adjacent buffer areas are arranged on each water retaining dike (2), and the water passing holes (3) on the adjacent water retaining dikes (2) are distributed in a staggered manner along the height direction of the water retaining dike; the bottom of each buffer area is sequentially paved with a diamond layer (4), a soil layer (8) and an aluminum modified soil layer (5) from bottom to top, or is sequentially paved with the aluminum modified soil layer (5), the soil layer (8) and the diamond layer (4) from bottom to top; the sedimentation tank (7) is communicated with the first-stage buffer area through a water diversion pipe (6), and the water outlet pipe (1) is communicated with the last-stage buffer area.
3. The apparatus according to claim 2, wherein: the water passing holes (3) are arranged near the top or bottom of the water retaining dike (2).
4. A device according to claim 2 or 3, characterized in that: the aluminum modified soil layer (5) is formed by mixing aluminum modified clay and soil, wherein the aluminum modified clay is formed by mixing clay, aluminum sulfate and stone powder with the grain size of 1-3 mm.
5. A device according to claim 2 or 3, characterized in that: the thicknesses of the diamond layer (4), the aluminum modified soil layer (5) and the soil layer (8) are respectively 10-20 cm.
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|---|---|---|---|
| CN201910238996.2A CN109775883B (en) | 2019-03-27 | 2019-03-27 | Method and device for reducing surface runoff phosphorus pollution of lakeshore buffer zone |
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| CN201910238996.2A CN109775883B (en) | 2019-03-27 | 2019-03-27 | Method and device for reducing surface runoff phosphorus pollution of lakeshore buffer zone |
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| CN109775883B true CN109775883B (en) | 2024-01-12 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030036424A (en) * | 2003-04-01 | 2003-05-09 | 박남종 | the loess production for improvement of a red tide and a Geological of the sea |
| CN104692588A (en) * | 2015-01-30 | 2015-06-10 | 天津大学 | Ecological multidimensional retention system for rainwater drainage on bank side of river |
| CN206289049U (en) * | 2016-12-16 | 2017-06-30 | 金埔园林股份有限公司 | Stepped undercurrent landscape wetland system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10183636A (en) * | 1996-12-26 | 1998-07-14 | Masanori Ono | Greening method for bulkhead slope |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030036424A (en) * | 2003-04-01 | 2003-05-09 | 박남종 | the loess production for improvement of a red tide and a Geological of the sea |
| CN104692588A (en) * | 2015-01-30 | 2015-06-10 | 天津大学 | Ecological multidimensional retention system for rainwater drainage on bank side of river |
| CN206289049U (en) * | 2016-12-16 | 2017-06-30 | 金埔园林股份有限公司 | Stepped undercurrent landscape wetland system |
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