Separation and residual water purification device for bottom mud soil treatment
By designing the separation and purification device of multi-layer filtration and adsorption modules, the problems of long dehydration cycle of bottom soil and residual water pollution are solved, efficient sludge and water separation and pollutant purification are achieved, resource utilization efficiency is improved and land occupation is reduced .
Patent Information
- Application Number
- CN202421044325.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-14
- Publication Date
- 2025-01-03
- Estimated Expiration
- 2034-05-14
AI Technical Summary
Traditional bottom soil dehydration technology has problems such as long dehydration cycle, incomplete sedimentation of mud and water, and residual water pollution, resulting in waste of land resources and secondary pollution.
A separation and residual water purification device including a cofferdam module, a filtration module, an adsorption module and a water collection and diversion module are designed to achieve sludge and water separation by gravity and multi-layer filtering structure, and purify residual water by adsorption and activated carbon.
It effectively shortens the dehydration time of bottom mud soil, improves treatment efficiency, reduces land occupation, prevents secondary pollution, and realizes the resource utilization of bottom mud soil and residual water.
Smart Images
Figure CN222288325U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of bottom mud soil treatment, and in particular relates to a separation and residual water purification device for bottom mud soil treatment. Background Art
[0002] Sediment soil is one of the main endogenous pollutants in water environment management projects. Pollutants enter the water body through atmospheric deposition, surface runoff and other pathways, and eventually settle and accumulate in the sediment soil. When water temperature, pH, dissolved oxygen and other conditions change or sediment soil is disturbed, the sediment soil will act as a "pollution source" and release the enriched pollutants back into the water body, causing a decline in water environment quality and affecting the ecological environment and the city's image.
[0003] Dehydration and solidification of sediment soil and purification of residual water are prerequisites for sediment soil disposal and resource utilization. At present, commonly used sediment soil dehydration technologies include geotube dehydration, mechanical dehydration and natural drying in the yard. The geotube dehydration method is to mix the sediment soil and dehydration agent into a geotube made of polypropylene. The sediment soil continuously discharges free water and pore water under the action of chemical flocculation and filtration of the geotube. This method can dehydrate on-site and has a large processing capacity, but the construction operation area is large, the requirements for the project site are high, and the added dehydration agent will cause secondary pollution to the surrounding soil and environment.
[0004] Mechanical filter pressing can solve the secondary pollution and other problems of geotube dehydration. Mechanical filter pressing uses the pressure or centrifugal action generated by machines such as plate and frame filter presses and centrifugal dehydrators to remove free water from the bottom mud soil. However, since the non-free water in the bottom mud soil, i.e. bound water, has a strong binding force with the bottom mud soil and cannot be separated by mechanical force, the moisture content of the output mud cake is high, and the mechanical equipment is expensive, manual loading and unloading of the bottom mud soil is required, which consumes a lot of electricity and has a high engineering cost.
[0005] At present, the natural drying method in the yard is the most commonly used dehydration method. The sediment dredging projects of lakes such as Dianchi Lake, Chaohu Lake, and Taihu Lake all use the traditional natural drying method in the yard. This method does not require expensive mechanical equipment, but it is greatly affected by weather factors such as rainfall. The dehydration cycle is long, and the drying period can be as long as 1 to 2 years, thereby occupying the sediment yard for a long time, causing idle waste of land resources. At the same time, the moisture in the sediment soil at the bottom of the yard is extremely difficult to discharge, and the moisture content cannot be further reduced, thereby affecting the subsequent transportation and resource utilization of the sediment soil. At the same time, if the residual water generated after dehydration by the above method is directly discharged without effective treatment, it will cause new secondary pollution problems.
[0006] Therefore, how to solve the problems of traditional storage yards being unable to simultaneously meet the requirements of mud-water separation and purification of residual water from sludge soil dehydration, as well as the long dehydration cycle of sludge soil, are the key issues that need to be addressed at present. Utility Model Content
[0007] In view of the defects of the prior art, the utility model provides a separation and residual water purification device for bottom mud soil disposal, which can simultaneously adsorb and purify pollutants in the bottom mud soil and residual water in the process of efficiently realizing mud and water separation.
[0008] The technical solution adopted by the utility model is as follows:
[0009] The utility model provides a separation and residual water purification device for bottom mud soil disposal, comprising: a cofferdam module, a bottom mud soil storage area, a filtering module, an adsorption module and a water collection and diversion module;
[0010] The cofferdam module is in the shape of a quadrilateral cofferdam with openings at the top and bottom; the bottom mud soil storage area, the filtration module, the adsorption module and the water collection and diversion module are arranged in sequence from top to bottom in the cofferdam module.
[0011] As a preferred technical solution of the utility model, the cofferdam module adopts a concrete wall structure, a polypropylene anti-seepage geomembrane is laid on the inner side of the cofferdam module, the side wall slope ratio of the cofferdam module is 1:1.5, and 1 to n bottom mud soil storage areas are arranged inside the cofferdam module.
[0012] As a preferred technical solution of the utility model, the filtration module includes a grid layer installed below the bottom mud soil storage area, a pebble filter layer installed below the grid layer, a fine sand filter layer installed below the pebble filter layer, and an anti-filter geotextile layer installed below the fine sand filter layer.
[0013] As a preferred technical solution of the utility model, the bars of the grid layer are cylindrical bars, the filter aperture is 30 mm, and the thickness of the grid layer is 20 mm.
[0014] As a preferred technical solution of the utility model, the pebble filter layer adopts pebble filter material with a particle size of 10mm to 20mm and a filling thickness of 200mm; the fine sand filter layer adopts quartz sand filter material with a particle size of 2mm to 3mm and a filling thickness of 100mm.
[0015] As a preferred technical solution of the utility model, the anti-filtration geotextile layer is made of PET anti-filtration geotextile with a pore size of 1 mm and a filling thickness of 10 mm.
[0016] As a preferred technical solution of the utility model, the adsorption module includes a zeolite adsorption layer installed below the filtration module and an activated carbon adsorption layer installed below the zeolite adsorption layer.
[0017] As a preferred technical solution of the utility model, the zeolite adsorption layer is selected to have a specific surface area of 150m 2 / g activated zeolite filter material, the filling thickness is 100mm; the activated carbon adsorption layer is selected with a specific surface area of 500m 2 / g modified activated carbon filter material, with a filling thickness of 100mm.
[0018] As a preferred technical solution of the utility model, the water collection and diversion module includes a drainage pipe installed below the adsorption module; a diversion hole with a diameter of 20 mm is opened on the wall of the drainage pipe; and a microporous metal mesh with a mesh range of 0.3 mm*0.6 mm and good water permeability is covered above the diversion hole.
[0019] As a preferred technical solution of the utility model, a diversion outlet is arranged on one side wall of the drainage pipe, and the cofferdam modules are arranged on the other three side walls.
[0020] The utility model provides a separation and residual water purification device for bottom mud soil disposal, the advantages and positive effects of which include at least:
[0021] Compared with the problem that the moisture in the lower sediment soil of traditional sediment drying yards is difficult to be naturally dried and dehydrated, after the sediment soil enters the cofferdam yard, the utility model allows the surface sediment soil to be naturally dried and dehydrated, while the moisture in the middle and lower sediment soil passes through the grid layer, pebble filter layer, fine sand filter layer and anti-filter geotextile layer in sequence under the action of gravity, and the large particles in the sediment soil are retained by the filter module, and the moisture passes through the pores of the filter module filler, thereby achieving the purpose of mud and water separation in the middle and lower sediment soil of the yard, which can effectively shorten the processing time of sediment dehydration and drying, improve the turnover efficiency of the sediment drying yard, and reduce the waste of land resources. At the same time, the residual water from the dehydrated sediment soil passes through the activated zeolite filter material and the modified activated carbon filter material of the adsorption module in turn, and the pollutants such as nitrogen and phosphorus in the residual water are purified by adsorption, so as to prevent the residual water from the dehydrated sediment soil from causing secondary pollution to the surrounding soil and environment; the dehydrated sediment soil can be used as the base fertilizer and topdressing of the forest land, improve the fertility of the soil, and provide the required nutrients for the growth of trees in the forest land. The residual water from the sediment soil after adsorption and purification can be used for forest land irrigation, so as to realize the resource utilization of the sediment soil. At the same time, the device does not require an external power supply, the process is green and environmentally friendly, and it conforms to the low-carbon concept of sustainable development. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present invention and do not constitute a limitation on the present invention. In the accompanying drawings:
[0023] Figure 1 A cross-sectional view of a device for separating and purifying residual water for treating bottom mud soil according to the utility model is shown;
[0024] Figure 2 A top view of a separation and residual water purification device for bottom mud soil disposal according to the utility model is shown;
[0025] Figure 3 The utility model shows a structural diagram of a water collection and diversion module in a separation and residual water purification device for bottom mud soil disposal.
[0026] The reference numerals are described as follows:
[0027] 1. Bottom mud soil storage area; 2. Cofferdam module; 3. Filtration module; 4. Adsorption module; 5. Water collection and diversion module; 21. Anti-seepage geomembrane; 31. Grid layer; 32. Pebble filter layer; 33. Fine sand filter layer; 34. Anti-filtration geotextile layer; 41. Zeolite adsorption layer; 42. Activated carbon adsorption layer; 51. Drainage pipe; 511. Diversion outlet; 52. Diversion hole. DETAILED DESCRIPTION
[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.
[0029] The same parts are denoted by the same reference numerals. It should be noted that the words "upper" and "lower" used in the following description refer to directions in the drawings of the present application specification, and the words "bottom surface" and "top surface", "inside" and "outside" refer to directions toward or away from a specific part, respectively.
[0030] The embodiment of the present application solves the problem that the dehydration cycle of the traditional sludge drying field is long and the residual water from the sludge soil dehydration is prone to cause secondary pollution by providing a separation and residual water purification device for sludge soil disposal.
[0031] The utility model provides a separation and residual water purification device for bottom mud soil disposal, the advantages and positive effects of which include at least:
[0032] Compared with the problem that the moisture in the lower sediment soil of traditional sediment drying yards is difficult to be naturally dried and dehydrated, after the sediment soil enters the cofferdam yard, the utility model allows the surface sediment soil to be naturally dried and dehydrated, while the moisture in the middle and lower sediment soil passes through the grid layer, pebble filter layer, fine sand filter layer and anti-filter geotextile layer in sequence under the action of gravity, and the large particles in the sediment soil are retained by the filter module, and the moisture passes through the pores of the filter module filler, thereby achieving the purpose of mud and water separation in the middle and lower sediment soil of the yard, which can effectively shorten the processing time of sediment dehydration and drying, improve the turnover efficiency of the sediment drying yard, and reduce the waste of land resources. At the same time, the residual water from the dehydrated sediment soil passes through the activated zeolite filter material and the modified activated carbon filter material of the adsorption module in turn, and the pollutants such as nitrogen and phosphorus in the residual water are purified by adsorption, so as to prevent the residual water from the dehydrated sediment soil from causing secondary pollution to the surrounding soil and environment; the dehydrated sediment soil can be used as the base fertilizer and topdressing of the forest land, improve the fertility of the soil, and provide the required nutrients for the growth of trees in the forest land. The residual water from the sediment soil after adsorption and purification can be used for forest land irrigation, so as to realize the resource utilization of the sediment soil. At the same time, the device does not require an external power supply, the process is green and environmentally friendly, and it conforms to the low-carbon concept of sustainable development.
[0033] The technical solution in the embodiment of the present application is to solve the above problems, and the overall idea is as follows:
[0034] A separation and residual water purification device for sediment soil disposal in an embodiment of the utility model comprises: a cofferdam module, a sediment soil storage area, a filtration module, an adsorption module and a water collection and diversion module.
[0035] The cofferdam modules are arranged around the device; the water in the sediment soil stored in the sediment soil storage area is first separated from the water by the filtration module due to its own gravity, and then the residual water in the sediment soil is adsorbed and purified by the adsorption module. Finally, the residual water in the sediment soil is discharged from the device through the water collection and diversion module.
[0036] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings in the specification and the specific implementation methods of the present utility model.
[0037] Figure 1 The cross-sectional view of a separation and residual water purification device for sediment soil disposal of the utility model is shown. The device of this embodiment includes a sediment soil storage area 1, a cofferdam module 2, a filtration module 3, an adsorption module 4 and a water collection and diversion module 5. The sediment soil storage area 1, the filtration module 3, the adsorption module 4 and the water collection and diversion module 5 are arranged in the cofferdam module 2 from top to bottom.
[0038] The cofferdam module 2 is in the shape of a quadrilateral cofferdam with openings at the top and bottom, and is used for stacking the bottom mud soil after excavation and transportation. The cross section is a regular trapezoid, and the cross sections of the bottom mud soil storage area 1, the filter module 3, the adsorption module 4 and the water collection and diversion module 5 are inverted trapezoids. The filter module 3 is provided with a grid layer 31 installed below the bottom mud soil storage area 1, a pebble filter layer 32 installed below the grid layer 31, a fine sand filter layer 33 installed below the pebble filter layer 32, and an anti-filter geotextile layer 34 installed below the fine sand filter layer 33 in order from top to bottom; the adsorption module 4 is provided with a zeolite adsorption layer 41 located below the filter module 3 and an activated carbon adsorption layer 42 installed below the zeolite adsorption layer 41 in order from top to bottom.
[0039] First, if Figure 1 , Figure 2 As shown, the cofferdam module 2 is arranged around the device and adopts a concrete wall structure, which can support the device and prevent the bottom mud soil and residual water from overflowing. The inner wall of the cofferdam module 2 is covered with an anti-seepage geomembrane 21 made of polypropylene material, and the side wall slope ratio of the cofferdam module 2 is 1:1.5. 1 to n bottom mud soil storage areas 1 are arranged inside the cofferdam module 2.
[0040] Secondly, if Figure 1 As shown, the bars in the grid layer 31 of the filter module 3 are cylindrical bars with a filter aperture of 30 mm and a thickness of 20 mm; the pebble filter layer 32 is filled with pebble filter material with a particle size of 10 mm to 20 mm, and a filling thickness of 200 mm; the fine sand filter layer 33 is filled with quartz sand filter material with a particle size of 2 mm to 3 mm, and a filling thickness of 100 mm; the anti-filter geotextile layer 34 uses a PET material anti-filter geotextile with a pore size of 1 mm, and a filling thickness of 10 mm.
[0041] Finally, if Figure 1 As shown, the filling specific surface area of the zeolite adsorption layer 41 in the adsorption module 4 is 150m 2 / g activated zeolite filter material, the filling thickness is 100mm; the filling specific surface area of the activated carbon adsorption layer 42 is 500m 2 / g modified activated carbon filter material, with a filling thickness of 100mm.
[0042] like Figure 1 , Figure 2 and Figure 3 As shown, a water collecting and diversion module 5 is provided at the bottom of the device, a drainage pipe 51 is installed in the water collecting and diversion module 5, and a diversion hole 52 is provided on the pipe wall above the drainage pipe 51, which is used for the residual water of the dehydrated bottom mud soil to enter the drainage pipe 51, and a diversion outlet 511 is provided on one side wall of the drainage pipe 51, and the other three side walls are supported by a cofferdam module 2 with a concrete wall structure.
[0043] Furthermore, the aperture of the diversion holes 52 is 20 mm, and the spacing between the diversion holes 52 is 20 mm. The diversion holes 52 are covered with a microporous metal mesh with a mesh range of 0.3 mm*0.6 mm and good water permeability, so as to prevent the fillers in the zeolite adsorption layer 41 and the activated carbon adsorption layer 42 from entering the drainage pipe 51, thereby preventing the drainage pipe 51 from silting up and blocking and the loss of fillers.
[0044] The utility model utilizes the grid layer, pebble filter layer, fine sand filter layer and anti-filter geotextile of the filter module to filter layer by layer to achieve mud-water separation. The residual water of the sludge is purified by the adsorption of zeolite and activated carbon in the adsorption module to purify pollutants such as nitrogen and phosphorus in the residual water. The device can efficiently optimize the dehydration and drying of the sludge soil while adsorbing and purifying pollutants in the residual water of the sludge soil, and can provide a new sludge disposal device for large-scale sludge drying projects.
[0045] In summary, the cofferdam module in the utility model application can support the device and prevent the sediment soil and residual water from overflowing; the mud and water separation of the sediment soil is achieved through the filtering module of the device; the residual water filtered out of the sediment soil is discharged after being purified by zeolite and activated carbon through the adsorption module; the sediment residual water after adsorption and purification is discharged into the drainage pipe through the diversion holes. During the sediment soil treatment process, the sediment soil and residual water do not come into contact with the external soil and the environment. Only the processes of mud and water separation and residual water adsorption and purification are completed in the device. The residual water after purification and the sediment soil after dehydration and drying can be utilized as resources. It improves the problem that the sediment soil in the lower part of the traditional drying field is difficult to dehydrate and the sediment residual water is easy to cause secondary pollution, improves the sediment soil treatment efficiency, and reduces the land occupation period. At the same time, the device process is simple and environmentally friendly, and does not cause secondary pollution to the surrounding soil and environment.
[0046] The above is only a preferred implementation of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications should also be regarded as the scope of protection of the present application.
Claims
1. A separation and residual water purification device for bottom mud soil disposal, characterized in that: include: Cofferdam module, bottom mud soil storage area, filtration module, adsorption module and water collection and diversion module; The cofferdam module is in the shape of a quadrilateral cofferdam with openings at the top and bottom; the bottom mud soil storage area, the filtration module, the adsorption module and the water collection and diversion module are arranged in sequence from top to bottom in the cofferdam module.
2. A separation and residual water purification device for bottom mud soil disposal according to claim 1, characterized in that: The cofferdam module adopts a concrete wall structure, a polypropylene anti-seepage geomembrane is laid on the inner side of the cofferdam module, the side wall slope ratio of the cofferdam module is 1:1.5, and 1 to n bottom mud soil storage areas are arranged inside the cofferdam module.
3. The device for separation and residual water purification for bottom mud soil disposal according to claim 1, characterized in that: The filtration module comprises a grid layer installed below the bottom mud soil storage area, a pebble filter layer installed below the grid layer, a fine sand filter layer installed below the pebble filter layer, and an anti-filter geotextile layer installed below the fine sand filter layer.
4. A separation and residual water purification device for bottom mud soil disposal according to claim 3, characterized in that: The bars of the grid layer are cylindrical bars, the filter aperture is 30 mm, and the thickness of the grid layer is 20 mm.
5. The device for separation and residual water purification for disposal of bottom mud and soil according to claim 3, characterized in that: The pebble filter layer uses pebble filter material with a particle size of 10mm to 20mm, and the filling thickness is 200mm; the fine sand filter layer uses quartz sand filter material with a particle size of 2mm to 3mm, and the filling thickness is 100mm.
6. The device for separation and residual water purification for bottom mud soil disposal according to claim 3, characterized in that: The anti-filtration geotextile layer is made of PET anti-filtration geotextile with a pore size of 1 mm and a filling thickness of 10 mm.
7. The device for separation and residual water purification for bottom mud soil disposal according to claim 1, characterized in that: The adsorption module comprises a zeolite adsorption layer installed below the filtration module and an activated carbon adsorption layer installed below the zeolite adsorption layer.
8. The device for separation and residual water purification for disposal of bottom mud and soil according to claim 7, characterized in that: The zeolite adsorption layer has a specific surface area of 150m 2 / g activated zeolite filter material, the filling thickness is 100mm; the activated carbon adsorption layer is selected with a specific surface area of 500m 2 / g modified activated carbon filter material, with a filling thickness of 100mm.
9. The device for separation and residual water purification for bottom mud soil disposal according to claim 1, characterized in that: The water collection and diversion module comprises a drainage pipe installed below the adsorption module; a diversion hole with a diameter of 20 mm is provided on the wall of the drainage pipe; a microporous metal mesh with a mesh range of 0.3 mm*0.6 mm and good water permeability is coated above the diversion hole.
10. The device for separation and residual water purification for bottom mud soil disposal according to claim 9, characterized in that: A diversion outlet is arranged on one side wall of the drainage pipe, and the cofferdam modules are arranged on the other three side walls.