CN112592009B - Multi-layer flat tube bag rapid dehydration system and dehydration method for slurry treatment - Google Patents
Multi-layer flat tube bag rapid dehydration system and dehydration method for slurry treatment Download PDFInfo
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- CN112592009B CN112592009B CN202011291219.3A CN202011291219A CN112592009B CN 112592009 B CN112592009 B CN 112592009B CN 202011291219 A CN202011291219 A CN 202011291219A CN 112592009 B CN112592009 B CN 112592009B
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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
- C02F11/00—Treatment of sludge; Devices therefor
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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
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
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Abstract
The invention relates to a multi-layer flat pipe bag rapid dehydration system and a dehydration method for slurry treatment, wherein the dehydration system comprises a drainage platform, and the drainage platform is arranged in a slope manner; a water collecting tank is arranged on the periphery of the drainage platform and is arranged at the lower edge of the gradient of the drainage platform, and water on the drainage platform is drained to the water collecting tank through the gradient; a plurality of layers of pipe bags are stacked on the drainage platform, water-containing slurry is filled in the pipe bags, an interlayer water guide layer is arranged between each layer of pipe bag, and a filling opening for filling the slurry into the pipe bags is formed in each pipe bag; a bottom water guide layer is arranged between the drainage platform and the bottom layer pipe bag; a water bag is arranged above the top layer pipe bag, and water is filled in the water bag. The dehydration system adopts the measures of stacking of multiple layers of flat pipe bags, water bag ballast and increasing the drainage boundary of the pipe bags to realize rapid dehydration and consolidation of slurry.
Description
Technical Field
The invention relates to a sludge and sludge dewatering system, in particular to a multi-layer flat tube bag rapid dewatering system for slurry treatment and a dewatering method thereof.
Background
A large amount of waste slurry is generated in river and lake dredging, channel dredging and various infrastructure engineering constructions, the slurry has high water content and huge volume, and dehydration, solidification and volume reduction treatment are required to avoid environmental pollution. The yard is built according to the traditional method, so that the sludge is naturally solidified, a large area of land is occupied, and the dehydration and solidification take a long time. The slurry dewatering method for the geotextile tube bag is characterized in that woven or woven geotextile is sewn into a large-size tubular bag, a filling opening is formed in the top of the tube bag, and slurry needing to be treated nearby is filled into the tube bag in a hydraulic filling mode. The geotextile sewn into the tube bag is of a plane porous structure, most of moisture in slurry can be filtered out, most of soil bodies are reserved, the water content of the slurry is greatly reduced after treatment, the volume of the slurry is reduced, and the geotextile is convenient to transport and further treat. The method has the advantages of low cost, simple device, capability of treating the slurry in large batch and the like, and becomes a better scheme for dewatering and volume reduction treatment of the slurry. When the pipe bag is used for treating the slurry with high viscosity content, the permeability coefficient of a complex formed by the bag cloth and the slurry is lower and the permeability gradient is smaller in the later stage of dehydration and consolidation, so that the discharge speed of a water body in the slurry is lower, the dehydration period is longer, and the construction period is increased. Therefore, the key for realizing the rapid dehydration, consolidation and volume reduction of the slurry by using the geotechnical pipe bag is to adopt certain measures to accelerate the dehydration and consolidation speed of the slurry in the pipe bag.
Disclosure of Invention
The invention provides a multi-layer flat pipe bag rapid dehydration system for slurry treatment and a dehydration method thereof, aiming at accelerating dehydration and consolidation of slurry in a pipe bag.
The technical scheme adopted by the invention is as follows: a multi-layer flat tube bag rapid dewatering system for slurry processing, comprising:
a drainage platform disposed at a grade;
a water collecting tank is arranged on the periphery of the drainage platform and is arranged at the lower edge of the gradient of the drainage platform, and water on the drainage platform is drained to the water collecting tank through the gradient;
a plurality of layers of pipe bags are stacked on the drainage platform, water-containing slurry is filled in the pipe bags, an interlayer water guide layer is arranged between each layer of pipe bag, and a filling opening for filling the slurry into the pipe bags is formed in each pipe bag;
a bottom water guide layer is arranged between the drainage platform and the bottom layer pipe bag;
a water bag is arranged above the top layer pipe bag, and water is filled in the water bag.
Furthermore, a plurality of tube bags are arranged in a trapezoidal structure, the length of the tube bags is the same, and the width of the tube bags is reduced from bottom to top in sequence.
Further, the tube bag comprises an overlapping area overlapped with the upper-layer tube bag and the lower-layer tube bag, and the filling opening is formed in the area of the tube bag except the overlapping area.
Further, a protective cushion layer is arranged between the bottom water guide layer and the bottom pipe bag and is 200g/m2The needle-punched filament non-woven geotextile prevents the bottom layer pipe bag from being punctured and damaged.
Furthermore, an anti-seepage layer is arranged below the bottom water guide layer to cover the operation field and the drainage ditch, so that the anti-seepage effect is achieved; the impermeable layer adopts a composite geomembrane, the membrane core is a PE geomembrane with the thickness of 0.5mm, and the two surfaces are compounded with non-woven geotextiles with the gram weight of more than or equal to 200g/m 2.
Furthermore, the drainage platform comprises a first area and a second area, the first area and the second area are connected and are arranged in a slope manner, the joint of the first area and the second area is the highest position of the slope, the slopes of the first area and the second area are inclined downwards in two opposite directions respectively, and the slopes are 1% -4%.
Furthermore, a water collecting well is arranged in the water collecting tank, the depth of the water collecting well is higher than that of the water collecting tank, the water collecting well is connected with a drainage device, and the drainage device discharges water in the water collecting well.
Furthermore, the water bag is provided with a filling and discharging opening, the water bag is formed by compounding high-strength fiber fabric and rubber, and the water bag is flat and pillow-shaped after being filled fully.
Furthermore, interlayer water guide layer is geotechnical composite drainage net, net core is polyethylene material, and two sides are compounded with needle-punched long filament non-woven geotechnical fabric, and thickness is 6-10 mm.
Further, the bottom water guide layer is formed by splicing a plurality of small flat three-dimensional drainage bodies, the material is polyethylene, the bottom water guide layer is formed by extruding plastic strands through a nozzle in a hot melting state by polyethylene, and the extruded plastic strands are welded on nodes through a forming device. The three-dimensional drainage bodies are tiled along the slope, and expansion joints are reserved between the adjacent drainage bodies so as to adapt to uneven settlement of the foundation.
Furthermore, the tube bag is a flat pillow-shaped bag body, and a plurality of filling openings are distributed on two sides of the tube bag according to the length of the tube bag; the transverse width of the tube bag is 5 m-20 m, the height is 0.5-0.8 m, and the longitudinal length is 10 m-40 m.
The invention relates to a dehydration method of a multi-layer flat tube bag rapid dehydration system for slurry treatment, which comprises the following steps:
(1) leveling a field, wherein a foundation surface is leveled into a cross slope which inclines to two sides by taking a long shaft of a pipe bag as a center in a construction area, and the gradient is 1% -4%;
(2) excavating a water collecting tank and a water collecting well around the foundation surface;
(3) paving an impermeable layer by taking the covered water collecting tank as a boundary, paving a bottom water guiding layer above the impermeable layer of the base surface area, and paving a protective cushion layer above the bottom water guiding layer;
(4) arranging a pipe bag above the protective pad layer, filling slurry from the filling openings at two sides, and tightening the filling openings after filling; opening a water pump periodically during the dehydration of the pipe bag to collect the wastewater in the water collecting well; after the pipe bag is primarily dehydrated and consolidated, an interlayer water guide layer and an upper layer pipe bag are sequentially paved on the upper part of the pipe bag, and the filling process is repeated after the pipe bag is fixed; sequentially arranging upper-layer pipe bags according to the flow until the design height is reached;
(5) arranging a top water guide layer and an empty ballast water bag above the top layer pipe bag in sequence, flushing a water discharge port from the water bag for water filling, and closing the water filling discharge port after the water filling is finished;
(6) after the slurry is dehydrated and solidified to reach the designed water content, flushing a discharge port from a water bag, discharging water, and recovering the water bag;
(7) and (4) transferring the dewatered volume-reduced dry soil to a landfill area or a storage yard, and recovering the water guide layer, the impermeable layer and the protective cushion layer.
Furthermore, the invention can be combined with measures of adding flocculating agent, vacuum filtration and other mud dehydration acceleration measures for use.
The beneficial effects produced by the invention comprise: (1) the invention adopts a multilayer flat geotextile tube bag stacking structure, the width of each layer of tube bag can reach 5 m-20 m, the length can reach 10 m-40 m, the batch size of slurry treated at one time is large, and the construction efficiency and the economic benefit are high; the seepage and drainage distance from the center of the flat tube bag to the drainage boundary of the bag cloth is less than 0.5m, so that the problem that the water in the center of the tube bag is difficult to drain can be effectively avoided; the flat pipe bag has a relatively large water surface section, is stable and reliable when stacked, can be stacked to more than 6m at most, and can greatly accelerate the dehydration and consolidation of slurry in the pipe bag through stacked ballast.
(2) According to the invention, the water guide layers are arranged at the bottom of the ballast water bag and between each layer of the pipe bag, so that the phenomenon that the effective dehydration boundary of the top and the bottom of the pipe bag is occupied by the heaped load is effectively avoided, and the dehydration efficiency of the pipe bag can be greatly improved. By top loading, the water pressure in the slurry in the pipe bag can be increased in the early dehydration stage, and the drainage speed is accelerated; in the later consolidation stage, the stacking load can be transferred to act on the soil in the pipe bag, so that the consolidation of the soil is accelerated.
(3) The invention adopts the flat three-dimensional drainage body as the bottom water guide layer and is arranged below the pipe bag, the bottom surface of the flat pipe bag with large infiltration slope and large flow area is fully utilized, the effective dehydration boundary of the pipe bag is doubled, the discharged water is rapidly transferred by utilizing the inclined water guide layer and the water collection tank, the bottom of the pipe bag is kept close to the free outflow state, and the drainage rate of the pipe bag is greatly increased; in addition, the water guide layer is spliced into a surface by adopting small three-dimensional drainage bodies, and an expansion joint is reserved between the adjacent drainage bodies, so that the water guide layer can adapt to the uneven settlement of the foundation on one hand, and the transportation, the laying and the recovery of the water guide layer are also convenient on the other hand.
(4) The main components of the multi-layer flat tube bag rapid dehydration system for slurry treatment comprise a ballast water bag, a water guide layer, an impermeable layer and a protective cushion material, which can be recycled; and the system uses the parts with low material cost, convenient transportation, mature manufacturing process and rapid construction, and is an economic and effective means for quickly dehydrating and reducing the volume of the slurry.
Drawings
FIG. 1 is a schematic diagram of a rapid dewatering system arrangement according to the present invention;
FIG. 2 is a schematic view of the cross-sectional structure A-A of FIG. 1;
FIG. 3 is a schematic view of the bottom water-conducting layer and the lower structure arrangement;
FIG. 4 is a schematic view of a flat three-dimensional drainage body for use with a bottom drainage layer;
in the figure: 1. a ballast water bag; 2. flat geotube bags; 3. a bottom water guide layer; 4. an impermeable layer; 5. a protective cushion layer; 6. a water collection tank; 7. a water bag filling and discharging port; 8. filling the pipe bag with a filling port; 9. A slanted base layer; 10. a water collecting well; 11. an interlayer water guide layer; 12. a water pumping pipeline.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It is intended that the scope of the invention be limited not by this detailed description, but rather by the claims appended hereto.
As shown in fig. 1-2, a multi-layer flat pipe bag rapid dehydration system for slurry treatment comprises a ballast water bag 1, a flat soil engineering pipe bag 2, a bottom water guide layer 3, an impermeable layer 4, a protective cushion layer 5, a drainage platform, an interlayer water guide layer 11 and a water pumping pipeline 12. The drainage platform comprises a water collecting tank 6, an inclined foundation layer 9 and a water collecting well 10. The main structure of the system sequentially comprises a ballast water bag, a plurality of interlayer water guide layers, a pipe bag stack body, a protective cushion layer, a bottom water guide layer, an impermeable layer and a water collecting tank from top to bottom.
A ballast water bag 1 is arranged above the pipe bags 2 and is in a flat pillow shape, and the dead weight load of the ballast water bag acts on the pipe bag stack body to accelerate the dehydration and consolidation of slurry in each layer of pipe bag; a water bag flushing and discharging opening 7 with a flange is arranged in the center of the side face, after water is filled, the water bag flushing and discharging opening is 4.5 m long in the transverse direction, 9 m long in the longitudinal direction and 1m high in the longitudinal direction, the ballast water bag cannot be too long, torsion instability in the filling process is prevented, and a plurality of ballast water bags can be arranged along the length if a single pipe bag is long; an interlayer water guide layer 11 is laid between the water bag 1 and the pipe bag 2 and between layers of the pipe bag 2, a geotechnical composite drainage net is used, a net core is made of polyethylene, and two surfaces of the geotechnical composite needle-punched filament non-woven geotextile are compounded; the bottommost layer pipe bag 2 (namely, the pipe bag close to the foundation layer) is 10m long in the transverse direction, 10m long in the longitudinal direction and 0.8 m high after being filled with slurry; the upper layer of pipe bags are the same in longitudinal length, the transverse length is sequentially 80% of that of the lower layer, and 4 layers of pipe bags are arranged; the bag body of the tube bag is 230 g/m2The polypropylene split film filament geotextile fabric is provided with a tube bag filling opening 8 at each of two sides, and the tube bag filling opening is tightened when filling is finished; a bottom water guide layer 3 is arranged below the bottommost layer pipe bag 2, a flat three-dimensional drainage body with the length of 2.5 m, the width of 2 m and the thickness of 0.1 m is spliced and paved on the whole working surface, and the flat three-dimensional drainage body is arranged on the bottom of the bottom layer pipe bagA settlement expansion joint is reserved between adjacent drainage bodies. As shown in fig. 3, the bottom water guiding layer is an inclined bottom water guiding layer for increasing the drainage boundary of the pipe bag and guiding the drainage liquid to the water collecting tank; the three-dimensional drainage body is made of polyethylene, fine plastic strands are extruded from the raw materials through a nozzle in a hot melting state, and the extruded plastic strands are welded on nodes through a forming device to form a three-dimensional net-shaped structure; an impermeable layer 4 is arranged below the bottom water guide layer 3 to cover the whole working face and the water collecting tank 6, a composite geomembrane is adopted, a membrane core is a PE geomembrane with the thickness of 0.5mm, and two faces are compounded to 200g/m2Needle punching a filament non-woven geotextile; a protective cushion layer 5 is arranged between the bottom water guide layer 3 and the pipe bag 2 for puncture prevention, and 200g/m is adopted2The needle-punched filament nonwoven geotextile of (1); the foundation 9 below the water guide layer 3 needs to be leveled into a cross slope which inclines towards two sides by taking the pipe bag 2 as a center, and the gradient is 2 percent; the water collecting tank 6 is 50 cm deep and is connected with the bottom water guide layer 3; a water collecting well 10 is arranged at the corner of the water collecting tank 6, accumulated water in the well is pumped out in time by a water pump, and the slope from the diagonal angle of the water collecting well 10 to the longitudinal slope of the water collecting tank 6 of the water collecting well 10 is reduced to 1%; the inner wall of the water collecting well 10 is stepped, the bottom is narrow, and the upper part is wide.
A dewatering method for a rapid flat-tube bag dewatering system for slurry processing, comprising the steps of:
(1) leveling a field ground, wherein a foundation surface 9 is leveled into a cross slope which is inclined to two sides by taking a long axis of the pipe bag 2 as a center in a construction area, and the gradient is 2%;
(2) excavating a water collecting groove 6 and a water collecting well 10 around the foundation surface;
(3) paving an impermeable layer 4 by taking a covering water collecting tank 6 as a boundary, paving a bottom water guide layer 3 above the impermeable layer 4 of the base surface area, and paving a protective cushion layer 5 above the bottom water guide layer 3;
(4) arranging a geotechnical pipe bag 2 above the protective cushion layer 5, filling slurry from the filling openings 8 at two sides, and fastening the filling openings 8 after filling; opening a water pump periodically during the dehydration of the pipe bag 2, and collecting the wastewater in the water collecting well 10 through a water pumping pipeline 12; after the pipe bag 2 is preliminarily dehydrated and consolidated, 11 layers of water guide layers and an empty upper layer of pipe bag 2 are sequentially paved above, and the filling process is repeated after the pipe bag 2 is fixed; sequentially arranging a plurality of layers of pipe bags 2 according to the flow until the design height is reached;
(5) sequentially arranging an interlayer water guide layer 11 and an empty ballast water bag 1 above the pipe bag 2, filling water from a water bag flushing and discharging port 7, and closing the water filling and discharging port 7 after the water filling is finished;
(6) after the slurry is dehydrated and solidified to reach the designed water content or the designed solidification degree, discharging water from a water bag flushing and discharging port 7, and recovering the water bag 1;
(7) and (3) running the dewatered volume-reduced dry soil to a landfill area or a storage yard, repeating the steps (4) to (6) to complete all mud treatment tasks, and recovering the water sac 1, the water guide layer 3/11, the impermeable layer 4 and the protective cushion layer 5.
In the description of the present application, it is to be understood that the terms "central," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are used in the orientations and positional relationships indicated in the drawings for the convenience of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be considered limiting of the claimed invention.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the content of the embodiment. It will be apparent to those skilled in the art that various changes and modifications can be made within the technical scope of the present invention, and any changes and modifications made are within the protective scope of the present invention.
Claims (5)
1. A quick dewatering system of multilayer flat tube bag for mud is handled which characterized in that: comprises that
A drainage platform disposed at a grade;
a water collecting tank is arranged on the periphery of the drainage platform and is arranged at the lower edge of the gradient of the drainage platform, and water on the drainage platform is drained to the water collecting tank through the gradient;
a plurality of layers of pipe bags are stacked on the drainage platform, each layer is provided with one pipe bag, the pipe bags are filled with water-containing slurry, an interlayer water guide layer is arranged between every two layers of pipe bags, and the pipe bags are provided with filling openings for filling the pipe bags with the slurry;
a bottom water guide layer is arranged between the drainage platform and the bottom layer pipe bag;
a water bag is arranged above the top layer pipe bag, and water is filled in the water bag; the plurality of tube bags are arranged in a trapezoidal structure, the length of the plurality of tube bags is the same, and the width of the plurality of tube bags is reduced from bottom to top in sequence; the pipe bag is a flat pillow-shaped bag body, and a plurality of filling openings are distributed on two sides of the pipe bag according to the length of the pipe bag; the transverse width of the tube bag is 5 m-20 m, the height of the tube bag is 0.5-0.8 m, and the longitudinal length of the tube bag is 10 m-40 m; the pipe bag comprises a superposition area overlapped with the upper layer pipe bag and the lower layer pipe bag, and the filling opening is arranged in the area of the pipe bag except the superposition area; a protective cushion layer is arranged between the bottom water guide layer and the bottom pipe bag, and an impermeable layer is arranged below the water guide layer;
the drainage platform comprises a first area and a second area, the first area and the second area are connected and are arranged in a slope manner, the joint of the first area and the second area is the highest position of the slope, the slopes of the first area and the second area are inclined downwards towards two opposite directions respectively, and the slopes are 1% -4%;
the water collecting tank is internally provided with a water collecting well, the depth of the water collecting well is greater than that of the water collecting tank, the water collecting well is connected with a drainage device, and the drainage device drains water in the water collecting well.
2. The system of claim 1, wherein the system further comprises: the water bag is provided with a filling and discharging opening, the water bag is formed by compounding high-strength fiber fabric and rubber, and is flat and pillow-shaped after being filled fully.
3. The system of claim 1, wherein the system further comprises: the interlayer water guide layer is a geotechnical composite drainage net, the net core is made of polyethylene, and the two surfaces of the interlayer water guide layer are compounded with the needle-punched filament non-woven geotextile.
4. The system of claim 1, wherein the system further comprises: the bottom water guide layer is formed by splicing a plurality of small three-dimensional net structures, the bottom water guide layer is formed by extruding plastic strands through a nozzle in a hot melting state by polyethylene, and the extruded plastic strands are welded on nodes through a forming device.
5. The dehydration method of the multi-layer flat tube bag rapid dehydration system for slurry treatment is characterized in that: the system for rapid dewatering of multi-layered flat tube bags for mud processing of claim 1, the method comprising: (1) leveling a field, namely leveling a foundation surface into a cross slope which inclines to two sides by taking a long axis of the pipe bag as a center in a construction area to form a drainage platform;
(2) excavating a water collecting tank around the foundation surface;
(3) paving an impermeable layer and a bottom water guide layer;
(4) arranging a geotechnical pipe bag above the bottom water guide layer, filling slurry from a filling opening, tightening the filling opening after filling, dehydrating the pipe bag, laying an interlayer water guide layer and an upper layer of pipe bag above the pipe bag after the pipe bag is primarily dehydrated and consolidated, and repeating the filling and dehydrating processes after fixing until all the pipe bags are laid;
(5) arranging an interlayer water guide layer and an empty ballast water bag above the top layer pipe bag, filling water from a water bag filling and discharging port, and closing the filling and discharging port after the water filling is finished;
(6) after the slurry is dehydrated and solidified to reach a set water content or a set solidification degree, discharging water from a water bag filling and discharging port, and recovering the water bag;
(7) and (4) transferring the dewatered volume-reduced dry soil to a landfill area or a storage yard, and recovering the water guide layer, the impermeable layer and the protective cushion layer.
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| CN202011291219.3A CN112592009B (en) | 2020-11-18 | 2020-11-18 | Multi-layer flat tube bag rapid dehydration system and dehydration method for slurry treatment |
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| CN202011291219.3A CN112592009B (en) | 2020-11-18 | 2020-11-18 | Multi-layer flat tube bag rapid dehydration system and dehydration method for slurry treatment |
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| CN112592009B true CN112592009B (en) | 2022-04-08 |
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