CN113697932A - Slow-release purification device and method for in-situ reduction of overflow pollution in rainy days - Google Patents
Slow-release purification device and method for in-situ reduction of overflow pollution in rainy days Download PDFInfo
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- CN113697932A CN113697932A CN202111080215.5A CN202111080215A CN113697932A CN 113697932 A CN113697932 A CN 113697932A CN 202111080215 A CN202111080215 A CN 202111080215A CN 113697932 A CN113697932 A CN 113697932A
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- 238000011065 in-situ storage Methods 0.000 title claims abstract description 29
- 238000000746 purification Methods 0.000 title claims abstract description 29
- 230000009467 reduction Effects 0.000 title claims abstract description 22
- 238000000034 method Methods 0.000 title claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 104
- 239000000463 material Substances 0.000 claims abstract description 79
- 238000006243 chemical reaction Methods 0.000 claims abstract description 55
- 239000010865 sewage Substances 0.000 claims abstract description 54
- 239000003344 environmental pollutant Substances 0.000 claims abstract description 10
- 231100000719 pollutant Toxicity 0.000 claims abstract description 10
- 238000000926 separation method Methods 0.000 claims description 31
- 238000005192 partition Methods 0.000 claims description 15
- 239000002245 particle Substances 0.000 claims description 11
- 239000011148 porous material Substances 0.000 claims description 10
- 230000035699 permeability Effects 0.000 claims description 5
- 239000008213 purified water Substances 0.000 claims description 4
- 239000013049 sediment Substances 0.000 claims description 4
- 230000003647 oxidation Effects 0.000 claims description 3
- 238000007254 oxidation reaction Methods 0.000 claims description 3
- 238000009434 installation Methods 0.000 abstract description 6
- 238000013268 sustained release Methods 0.000 description 7
- 239000012730 sustained-release form Substances 0.000 description 7
- 230000004888 barrier function Effects 0.000 description 4
- 239000003814 drug Substances 0.000 description 4
- 239000004343 Calcium peroxide Substances 0.000 description 3
- 239000003463 adsorbent Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- LHJQIRIGXXHNLA-UHFFFAOYSA-N calcium peroxide Chemical compound [Ca+2].[O-][O-] LHJQIRIGXXHNLA-UHFFFAOYSA-N 0.000 description 3
- 235000019402 calcium peroxide Nutrition 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000008439 repair process Effects 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000002775 capsule Substances 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000000701 coagulant Substances 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- -1 flocculant Substances 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 239000011572 manganese Substances 0.000 description 1
- 239000008204 material by function Substances 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 230000001546 nitrifying effect Effects 0.000 description 1
- 239000007800 oxidant agent Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
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- 238000004886 process control Methods 0.000 description 1
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- MWNQXXOSWHCCOZ-UHFFFAOYSA-L sodium;oxido carbonate Chemical compound [Na+].[O-]OC([O-])=O MWNQXXOSWHCCOZ-UHFFFAOYSA-L 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
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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
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Biological Treatment Of Waste Water (AREA)
Abstract
The invention provides a slow-release purification device and a slow-release purification method for in-situ reduction of rainy-day overflow pollution, wherein the slow-release purification device for in-situ reduction of rainy-day overflow pollution comprises a permeable water quality restoration reaction wall, the permeable water quality restoration reaction wall is arranged in river water below a sewage outlet at the tail end of a drain pipe, and a slow-release material is arranged in the permeable water quality restoration reaction wall. The permeable water quality restoration reaction wall can obviously reduce the concentration of pollutants in water near a sewage outlet, greatly reduce the rain overflow pollution, has low cost, convenient installation and convenient popularization, and is a simple, effective and economic rain overflow pollution in-situ reduction method.
Description
Technical Field
The invention relates to the field of river and lake water body restoration, in particular to a slow-release purification method for reducing rain overflow pollution in situ.
Background
With the acceleration of the urbanization process in China, the phenomenon of black and odorous river channels in rainy days is increasingly prominent, and the phenomenon is common in most cities in China, especially in southern areas. Research shows that the main reason for the black and odorous rainy days of urban water in China is rain overflow pollution of a split-flow system and a combined-flow system. The overflow sewage in rainy days contains a large amount of pollutants from different pollution sources, and is discharged into rivers without being fully treated, so that the water environment and water ecological systems of rivers and lakes are seriously damaged. For example, in southern areas of China, when the combined system drains water in rainy days, COD can reach 1200mg/L, and the average value can reach 540 mg/L; when the rain and sewage of the shunt system are mixed and connected, the sewage discharged into the rainwater pipe network is subjected to overflow pollution when raining, and the discharged COD is as high as 800-1100 mg/L, so that the river channel is black and smelly in rainy days.
At present, the problem of the overflow pollution in rainy days at home and abroad generally starts from three aspects of source reduction, process control and terminal treatment. The end control is a direct and effective purification mode, for example, a cyclone separator or a rapid filter tank is arranged for pretreatment before overflow sewage is discharged to a river channel, so that the source of the black and odor causing substances is reduced. However, the use of cyclone separators requires periodic cleaning of the apparatus for deposits and has poor removal of dissolved contaminants; the rapid filter tank usually occupies a large area, and related devices need to be installed in a matching way, so that the cost is high. Most importantly, most of the adopted functional materials are coagulant, flocculant, oxidant and other medicaments with high consumption speed, and are dissolved immediately after contacting with water, so that on one hand, a part of the medicaments which are not consumed are washed away by water flow to cause waste, and on the other hand, the medicaments cannot be quantitatively added or replaced according to the sewage discharge amount to cause inconvenience.
Disclosure of Invention
The invention aims to provide a slow-release purification device and a slow-release purification method, which are convenient for adding or replacing medicaments, have low cost, are environment-friendly and do not waste and can reduce the overflowing pollution in rainy days in situ.
In order to achieve the above technical object, the present invention provides:
the slow release purification device comprises a permeable water quality restoration reaction wall, wherein the permeable water quality restoration reaction wall is arranged in river water below a drain outlet at the tail end of a drain pipe, and a slow release material is arranged in the permeable water quality restoration reaction wall.
Preferably, a flow guide pipe is arranged on the sewage discharge outlet, and an outlet of the flow guide pipe is positioned above the permeable water quality restoration reaction wall and used for guiding overflow sewage into the permeable water quality restoration reaction wall.
Preferably, the permeable water quality restoration reaction wall comprises a porous support, the porous support is vertically arranged in bottom mud at the bottom of the sewage tank, an upper separation net and a lower separation net are respectively arranged above and below the porous support, and a slow release material is filled between the upper separation net and the lower separation net.
Preferably, the porous support is vertically arranged on the bottom mud at the bottom of the sewage pool in a hollow cuboid or cube or cylinder structure.
Preferably, the pore diameter of the upper separation net and the pore diameter of the lower separation net are the same as the pore diameter of the porous support, and 3mm-6mm is adopted.
Preferably, the particle size of the slow release material is 4mm-8 mm.
Preferably, the pore diameter of the porous bracket is uniform with the particle diameter of the slow-release material, so that the wall body of the permeable reactive barrier has consistent permeability, and a water body uniformly flows through the permeable water quality restoration reactive barrier.
Preferably, the bottom of the permeable water quality restoration reaction wall is provided with a colored ribbon, when the slow release material is sufficient, the colored ribbon is pressed at the bottom of the permeable water quality restoration reaction wall, and when the slow release material is used up, the colored ribbon floats to the water surface to remind the user of adding the material.
Preferably, the permeable water quality restoration reaction wall comprises a box body with a cylindrical structure, a balance weight is arranged at the bottom of the box body, the box body is vertically arranged on bottom mud at the bottom of the sewage pool through the balance weight, an internally opened box door is arranged at the top of the box body, an upper separation net is arranged in the box body, a gap of 50cm is reserved between the upper separation net and the box door, and a slow release material is filled between the upper separation net and the bottom of the box body.
The invention also provides a slow-release purification device for in-situ reduction of overflow pollution in rainy days, which comprises the following steps:
s1: arranging a permeable water quality restoration reaction wall in the river below the tail end of the drainage pipe, wherein the permeable water quality restoration reaction wall is vertically arranged in the bottom mud of the river, and the height of the permeable water quality restoration reaction wall is close to the normal water level;
s2: when the rain is rainy, the overflow sewage flows through the permeable water quality restoration reaction wall to be fully contacted with the slow release material, so that the enhanced oxidation is realized; when the sewage is discharged from a sewage outlet in a non-rainy day, the sewage flows through the upper partition net in the permeable water quality restoration reaction wall and then flows onto the slow release material in the porous bracket, the slow release material is accelerated to release and dissolve by the impact force of water flow, and the dissolved slow release material is slowly released into the water body through the porous net and the partition net on the bracket, so that pollutants are degraded and the water body is purified;
s3: the purified water body flows into a received river through a lower partition net at the lower end of the permeable water quality restoration reaction wall.
Due to the adoption of the technical scheme, compared with the prior art, the invention has the following advantages and positive effects:
1. according to the slow-release purification method for in-situ reduction of the rainy-day overflow pollution, the slow-release material is used as the wall material, so that the defects that a common material is quickly dissolved in water and the repair time is short are overcome, the adding or replacing frequency of the material is reduced, the in-situ reduction of the rainy-day overflow pollution can be carried out stably and efficiently for a long time, and the source control of the river and lake pollution is realized.
2. The slow-release purification method for reducing the rain overflow pollution in situ has the advantages of simple device, low installation and operation cost, easy control of technology, no energy consumption requirement, underwater installation and use, no influence on the appearance, porous support form, strong permeability and no influence on normal drainage of waterlogging.
3. According to the slow-release purification method for in-situ reduction of the overflow pollution in rainy days, the speed of the slow-release material is increased when the water flow is disturbed in rainy days, so that the overflow pollutant is intensively degraded; the water flow speed is slow in non-rainy days, the slow release speed is slow, and the material consumption speed is reduced. And the method has no sediment, does not increase the bottom mud of the river channel, and is a clean, efficient and stable method for reducing the overflow pollution in situ in rainy days.
Drawings
FIG. 1 is a schematic structural diagram of a first embodiment of a slow-release purification method for in-situ reduction of overflow pollution in rainy days according to the present invention;
fig. 2 is a schematic structural diagram of an embodiment two of the slow-release purification method for in-situ reduction of overflow pollution in rainy days provided by the invention.
The numbers in the figure are as follows:
1. river banks; 2. a box door; 3. a separation net is arranged; 4. a slow release material; 5. a lower separation net; 6. a porous scaffold; 7. bottom mud; 8. balancing weight; 9. a sewage draining outlet.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
As shown in fig. 1, the invention discloses a slow-release purification method for reducing rain overflow pollution in situ, which comprises a permeable water quality restoration reaction wall, wherein the permeable water quality restoration reaction wall is arranged in river water below a sewage outlet 9 at the tail end of a drain pipe, the permeable water quality restoration reaction wall comprises a porous support 6, the porous support 6 can be vertically arranged in river sediment 7 in a hollow cuboid, cube or cylinder structure, a plurality of small holes with uniform pore diameters are formed in the porous support 6, an upper separation net 3 and a lower separation net 5 are respectively arranged at the upper part and the lower part in the porous support 6, and a slow-release material 4 is filled between the upper separation net 3 and the lower separation net 5.
Further, the pore diameters of the upper separation net 3, the lower separation net 5 and the porous scaffold are not suitable to be too small, and can be but not limited to 3mm-6mm, and the particle diameter of the sustained-release material 4 can be but not limited to 4mm-8 mm.
Furthermore, the installation position and the cross-sectional area of the permeable water quality restoration reaction wall are calculated and designed according to the height of a sewage discharge pipeline, the average flow velocity of overflow sewage, the area and the range of the sewage contact water surface. And a flow guide pipe is arranged on the sewage outlet 9, and the outlet of the flow guide pipe is positioned above the permeable water quality restoration reaction wall and is used for guiding overflow sewage into the permeable water quality restoration reaction wall.
Further, in order to ensure that the wall body of the permeable reactive barrier has consistent permeability, and water uniformly flows through the permeable water quality restoration reactive barrier, the aperture of the porous bracket 6 and the particle size of the slow release material 4 are as uniform as possible.
Further, an adsorbent or other non-sustained-release materials are also arranged in the porous support, the adsorbent or other non-sustained-release materials are mixed with the sustained-release materials 4, and the particle sizes of the adsorbent or other non-sustained-release materials and the sustained-release materials 4 are consistent. In addition, the kind and particle size of the sustained-release material 4, the material of the separation net, the pore size and other conditions can be adjusted according to the actual water body condition, and are not limited to the above description. The permeable water quality restoration reaction wall can be combined with other technologies (such as a pipeline mixing reactor) for use, and the filled slow-release material can be adjusted according to the target pollutants.
Further, the slow release material 4 can be selected from, but not limited to, an oxidizing material, a reducing material, an oxygen releasing material, and the like, and depending on the pollutant, can be selected from, but not limited to, a chemical substance (such as calcium peroxide, percarbonate, and the like), a microbial strain (such as a nitrifying strain, a manganese oxidizing strain, and the like), and the like, and the slow release manner can be selected from, but not limited to, an embedded type, an adsorption type, a capsule type, and the like. The adding amount of the slow-release material can be estimated according to a previous test, and the material is added or replaced periodically (for example, a sensor is arranged on the separation net, and the adding or the material replacement is reminded when the upper separation net and the lower separation net are contacted).
The bottom of the permeable water quality restoration reaction wall is provided with the colored ribbon, when the slow release material 4 is sufficient, the colored ribbon is pressed at the bottom of the permeable water quality restoration reaction wall, and when the slow release material 4 is used up, the colored ribbon floats to the water surface to remind the user of adding the material.
The invention also provides a slow-release purification method for in-situ reduction of overflow pollution in rainy days, which comprises the following steps:
s1: a permeable water quality restoration reaction wall is arranged in the sewage tank right below the tail end of the drain pipe, the permeable water quality restoration reaction wall is vertically arranged at the bottom of the sewage tank and is positioned on one side of the river bank 1, and the height of the permeable water quality restoration reaction wall is close to the normal water level;
s2: when the rain is rainy, the overflow sewage flows through the permeable water quality restoration reaction wall to be fully contacted with the slow release material 4, so that the enhanced oxidation is realized; in non-rainy days, when sewage is discharged from the sewage outlet 9, the sewage flows through the upper partition net 3 in the permeable water quality restoration reaction wall and then flows onto the slow release material 4 in the porous bracket, the impact force of water flow accelerates the slow release material 4 to be released and dissolved, and the dissolved slow release material is slowly released into a water body through the porous and partition nets on the bracket, so that pollutants are degraded and the water body is purified;
s3: the purified water body flows into the receiving river through the lower partition net 5 at the lower end of the permeable water quality restoration reaction wall.
The slow release material 4 is added between the upper and lower separation nets, and the particle size of the slow release material 4 is required to be larger than the aperture of the porous bracket and can be 4-8 mm.
The invention is illustrated in detail below by means of two examples:
example one
According to daily monitoring data, the range of a contact surface between sewage discharged by a sewage discharge outlet 9 and the surface of river water in rainy days at different flow rates is estimated, a cylindrical permeable water quality restoration reaction wall consisting of a porous support 6 (the aperture is 4mm) is arranged below the contact surface, a guide pipe is arranged at the sewage discharge outlet 9, overflow sewage is led to the permeable water quality restoration reaction wall, and the cross section area of the cylinder is enough to accommodate most of the overflow sewage. The slow release material 4 is a sodium alginate-embedded calcium peroxide slow release material (the average particle size is 6mm), the slow release material 4 is added between an upper separation net and a lower separation net (the pore diameter is 4mm), the separation net is connected with a sensor, and when the slow release material 6 is used up, the slow release material is reminded to be added. The size of the wall body can be calculated and designed according to the slow release speed of the selected slow release material, the treatment effect on the overflow sewage and the expected service time.
Example two
On the basis of the first embodiment, the invention provides a structure for replacing a permeable water quality restoration reaction wall, as shown in fig. 2, in the second embodiment, the permeable water quality restoration reaction wall adopts a cylindrical box body, the bottom of the box body is reinforced by a balance weight 8, the box body is vertically arranged on river channel bottom mud 7 through the balance weight 8, an internally-opened box door 2 is installed at the top of the box body, an upper partition net 3 is arranged in the box body, a 50cm distance is reserved between the upper partition net 3 and the box door 2, and a slow release material 4 is filled between the upper partition net 3 and the bottom of the box body.
According to daily monitoring data, the range of a contact surface between sewage discharged by the sewage discharge outlet 9 and the surface of river water in rainy days at different flow rates is estimated, a water quality restoration reaction wall consisting of a cylindrical box body is arranged below the contact surface, a guide pipe is arranged at the sewage discharge outlet 9 to guide overflow sewage to the reaction wall, and the cross section area of the cylinder is enough to accommodate most of the overflow sewage. The bottom of the box body is provided with a counterweight for reinforcement, the slow release material is added in the box body to the height of 50cm away from the box door, and the slow release material 4 is a sodium alginate-embedded calcium peroxide slow release material (the average particle size is 6 mm). In non-rainy days, no water flow disturbance exists, and the slow release material is slowly released in the accumulated water in the box body to form an oxygen-enriched solution; in rainy days, the sewage is discharged from the sewage discharge outlet 9, the box door 2 at the top of the box body is opened inwards under the action of water body pressure, the sewage enters the box body and is fully contacted with the oxygen-enriched solution, pollutants are degraded in an enhanced manner, the release speed of the slow-release material is accelerated, and the purified water body flows back to a river channel; the size of the box body can be calculated and designed according to the slow release speed of the selected slow release material, the treatment effect on the overflow sewage and the expected service time. And setting a countdown device according to the expected service time to remind the user to replace the material.
According to the slow-release purification method for in-situ reduction of the rainy-day overflow pollution, the slow-release material is used as the wall material, so that the defects that a common material is quickly dissolved in water and the repair time is short are overcome, the adding or replacing frequency of the material is reduced, the in-situ reduction of the rainy-day overflow pollution can be carried out stably and efficiently for a long time, and the source control of the river and lake pollution is realized. The device is simple, low in installation and operation cost, easy to master the technology, free of energy consumption requirement, strong in permeability and free of influence on normal drainage of the waterlogging due to underwater installation and use and the adoption of a porous support form. The speed of the slow-release material is increased when the water flow is disturbed in rainy days, so that the overflow pollutants are intensively degraded; the water flow speed is slow in non-rainy days, the slow release speed is slow, and the material consumption speed is reduced. And the method has no sediment, does not increase the bottom mud of the river channel, and is a clean, efficient and stable method for reducing the overflow pollution in situ in rainy days.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the equipment or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (10)
1. The slow-release purification device is characterized by comprising a permeable water quality restoration reaction wall, wherein the permeable water quality restoration reaction wall is arranged in river water below a drain outlet (9) at the tail end of a drain pipe, and a slow-release material (4) is arranged in the permeable water quality restoration reaction wall.
2. The slow-release purification device for in-situ reduction of overflow pollution in rainy days according to claim 1, wherein a flow guide pipe is arranged on the sewage outlet (9), and the outlet of the flow guide pipe is positioned above the permeable water quality restoration reaction wall and used for guiding overflow sewage into the permeable water quality restoration reaction wall.
3. The slow-release purification device for in-situ reduction of overflow pollution in rainy days according to claim 1, wherein the permeable water quality restoration reaction wall comprises a porous support (6), the porous support (6) is vertically arranged in bottom mud (7) at the bottom of the sewage tank, an upper separation net (3) and a lower separation net (5) are respectively arranged above and below the porous support (6), and a slow-release material (4) is filled between the upper separation net (3) and the lower separation net (5).
4. The slow-release purification device for in-situ reduction of overflow pollution in rainy days as claimed in claim 3, characterized in that the porous bracket (6) is vertically arranged on the bottom sediment (7) at the bottom of the sewage tank in a hollow cuboid or cube or cylinder structure.
5. The slow-release purification device for reducing the overflow pollution in rainy days in situ as claimed in claim 3, wherein the pore diameters of the upper separation net (3) and the lower separation net (5) are the same as those of the porous bracket (6), and 3mm-6mm is adopted.
6. The slow-release purification device for reducing the overflow pollution in rainy days in situ as claimed in any one of claims 1 or 3, wherein the particle size of the slow-release material (4) is 4mm-8 mm.
7. The slow-release purification device for in-situ reduction of overflow pollution in rainy days according to claim 3, wherein the pore diameter of the porous bracket (6) is uniform with the particle diameter of the slow-release material (4), so that the wall body of the permeable reactive wall has uniform permeability, and water can uniformly flow through the permeable water quality restoration reactive wall.
8. The slow release purification device for in-situ reduction of overflow pollution in rainy days according to claim 3, wherein the bottom of the permeable water quality restoration reaction wall is provided with a colored ribbon, when the slow release material (4) is sufficient, the colored ribbon is pressed at the bottom of the permeable water quality restoration reaction wall, and when the slow release material (4) is used up, the colored ribbon floats to the water surface to remind the user of adding the material.
9. The slow-release purification device for in-situ reduction of overflow pollution in rainy days according to claim 1, wherein the permeable water quality restoration reaction wall comprises a box body with a cylindrical structure, a counterweight (8) is arranged at the bottom of the box body, the box body is vertically arranged on bottom mud (7) at the bottom of the sewage pool through the counterweight, an internally opened box door (2) is arranged at the top of the box body, an upper partition net (3) is arranged in the box body, a 50cm gap is reserved between the upper partition net (3) and the box door (2), and a slow-release material (4) is filled between the upper partition net (3) and the bottom of the box body.
10. A slow-release purification method for in-situ reduction of overflow pollution in rainy days is characterized by comprising the following steps:
s1: a permeable water quality restoration reaction wall is arranged in the sewage tank below the tail end of the drain pipe, the permeable water quality restoration reaction wall is vertically arranged in the bottom mud (7), and the height of the permeable water quality restoration reaction wall is close to the normal water level;
s2: when the rain is rainy, the overflow sewage flows through the permeable water quality restoration reaction wall to be fully contacted with the slow release material (4), so that the enhanced oxidation is realized; when the sewage is discharged from a sewage outlet (9) in a non-rainy day, the sewage flows through an upper partition net (3) in the permeable water quality restoration reaction wall and then flows onto the slow release material (4) in the porous bracket, the slow release material (4) is released and dissolved in an accelerated way by the impact force of water flow, and the dissolved slow release material is slowly released into a water body through the porous and partition nets on the bracket, so that pollutants are degraded and the water body is purified;
s3: the purified water body flows into a receiving river through a lower partition net (5) at the lower end of the permeable water quality restoration reaction wall.
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Application publication date: 20211126 |