System and method for semi-closed rapid and stable dehydration of geomembrane for stockpiled waste excavation materials

Abstract

The present invention discloses a system and method for semi-closed rapid and stable dehydration of stockpiled waste excavation materials with geomembrane. The system includes a semi-closed placement site for excavation materials with geomembrane, a heat pump, and a humus soil treatment device. The semi-closed placement site for excavation materials with geomembrane includes a semi-closed workshop. Below the semi-closed workshop, there are air ducts, leachate pipes, and hot water pipes. Inside the semi-closed workshop, there are an automatic film covering device and an air extraction device to cover the excavation materials with film and ventilate; the air extraction device is sequentially connected to the heat pump and the humus soil treatment device; the humus soil treatment device includes a supporting layer, a humus soil layer, a water distribution layer, and a hot water pipe, and the two hot water pipes are connected for circulation; the leachate pipe is communicated with the humus soil treatment device. The present invention adopts a new heat pump technology, makes full use of solar energy, the heat of the pile body, and the heat released by gas condensation, realizes the rapid, stable and dehydration of stockpiled waste excavation materials, improves the subsequent treatment efficiency of stockpiled waste while reducing energy use, and solves the problems of cross-flow of conventional excavation material leachate and escape of malodorous gases.

Description

Technical Field

[0001] The present invention belongs to the technical field of solid waste treatment, and relates to a solid waste treatment system and method, in particular to a system and method for semi-closed rapid and stable dehydration of stockpiled waste excavation materials with geomembrane. Background Art

[0002] Stockpiled waste refers to the aged waste including simple landfills, quasi-sanitary landfills (collectively referred to as informal landfills) and sanitary landfills.

[0003] At present, the treatment technologies for stockpiled waste are divided into two categories: in-situ aerobic stabilization treatment and ex-situ treatment. Among them, ex-situ treatment mainly adopts resource selection and recycling technologies. The in-situ aerobic stabilization treatment technology can accelerate the degradation of organic matter in the waste, greatly shorten the waste stabilization period, reduce the generation of gases such as CH4, NH3, and H2S, reduce the risk of air pollution in the landfill, and release part of the landfill capacity at the same time. However, the released capacity is far from enough.

[0004] The stockpiled waste resource selection and recycling technology is a technology for stockpiled waste excavation, quality screening and resource utilization of stockpiled waste landfills that meet the conditions. Compared with the in-situ aerobic stabilization treatment technology, the stockpiled waste resource selection and recycling technology has the advantages of completely eradicating the pollution source of stockpiled waste, realizing the complete release of landfill capacity and land value, and resource recycling and reuse.

[0005] However, the initial moisture content of stockpiled waste in China is generally high. If it is directly screened without pretreatment after excavation, it is very easy to cause equipment blockage, affecting the screening efficiency and quality, resulting in difficult stable operation of the project and low economic benefits; at the same time, the stockpiled waste with low stability is prone to secondary pollution problems such as malodorous gas and leachate, affecting the operation area and the surrounding environment.

[0006] Therefore, there is an urgent need for a new technology to solve problems such as high moisture content of stockpiled waste, unorganized emission of malodorous gas and leachate discharge. Summary of the Invention

[0007] The purpose of the present invention is to provide a system and method for semi-closed rapid and stable dehydration of stockpiled waste excavation materials with geomembrane. By constructing facilities such as a geomembrane semi-closed placement site, humus soil treatment device and pipeline system, and adopting a new type of heat pump technology, making full use of solar energy, heat of the heap body and heat release from gas condensation, rapid stabilization and dehydration of stockpiled waste excavation materials are realized, while reducing energy consumption and improving the subsequent treatment efficiency of stockpiled waste, and solving the problems of cross-flow of leachate and escape of malodorous gas from conventional excavation materials.

[0008] The technical solution of the present invention is as follows:

[0009] System for semi-closed rapid and stable dehydration of stockpiled waste excavation materials using geomembrane, comprising a semi-closed stockyard for excavation materials with geomembrane, a heat pump, and a humus soil treatment device; the semi-closed stockyard for excavation materials with geomembrane includes a semi-closed plant building, where the excavation materials are stacked; below the semi-closed plant building, there are air ducts, leachate pipes, and hot water pipes, and the air ducts and leachate pipes communicate with the excavation materials; inside the semi-closed plant building, there are automatic film covering devices and air extraction devices to cover the excavation materials with film and suck air, and the air extraction devices are sequentially connected to the heat pump and the humus soil treatment device; the humus soil treatment device includes a supporting layer, a humus soil layer, a water distribution layer, and a hot water pipe, and the hot water pipe communicates with the hot water pipe below the semi-closed plant building to form a cycle; the humus soil treatment device communicates with the leachate pipe.

[0010] Furthermore, the semi-closed stockyard for excavation materials with geomembrane is divided into several independent treatment units, and each treatment unit includes the automatic film covering device and the air extraction device.

[0011] Furthermore, the automatic film covering device includes a film end structure, an electric lifting structure, and a light-transmitting film. Film end structures are provided at the four corners of the light-transmitting film, and an electric lifting structure is provided at the top of the semi-closed plant building, and the electric lifting structure is connected to the film end structure.

[0012] Furthermore, a detachable air extraction device is provided on the light-transmitting film.

[0013] Furthermore, the film end structure includes a heavy mass, a screw, a nut, and a pressing plate. There is a hollow space on the side of the heavy mass, a hole is provided on the top surface of the heavy mass and at the top of the hollow space, a nut is fixedly provided above the hole, the screw can be placed in the hole, and the pressing plate is provided between the bottom of the screw and the light-transmitting film.

[0014] Furthermore, the top of the semi-closed plant building uses sunlight tiles to utilize solar energy to increase and maintain the temperature of the heap inside the treatment unit. Below the semi-closed plant building, there is a pipe trench, and inside the pipe trench from bottom to top, there are the leachate pipe, the air duct, and the hot water pipe. A perforated plate is laid above the pipe trench, and the perforated plate is flush with the ground of the semi-closed plant building.

[0015] Furthermore, in the humus soil treatment device, the supporting layer, the humus soil layer, and the water distribution layer are sequentially arranged from bottom to top; the hot water pipe is laid in a serpentine shape in the humus soil layer and the supporting layer; the leachate pipe communicates with the water distribution layer.

[0016] Method for semi-closed rapid and stable dehydration of stockpiled waste excavation materials using geomembrane, comprising:

[0017] Step 1) Place the excavated materials in the semi-closed yard of the geomembrane for excavated materials. After reaching the set capacity, use the automatic film covering device to cover the excavated materials with a film and install an exhaust device. Turn on the heat pump and suck the excavated material pile. The covered film tightly tightens the pile due to negative pressure, so that dry air can only enter the pile through the air duct. The leachate generated by the pile flows down due to gravity and is collected through the leachate pipe;

[0018] Step 2) The heat pump heats the sucked wet gas and sends it into the humus soil treatment device. The high-temperature wet inlet gas passes through the humus soil layer. The gas condenses and releases heat. The condensed water flows downwards, and the low-temperature gas rises upwards. The released heat and the heat generated by the composting of the humus soil layer exchange heat with the hot water pipe in the humus soil layer to increase or maintain the temperature of the hot water pipe; Since the two hot water pipes are connected in a cycle, in the semi-closed yard of the geomembrane for excavated materials of the stockpiled waste, the hot water pipe exchanges heat with the air inlet of the air duct to increase the temperature of the pile and accelerate the stabilization and dehydration rate of the pile;

[0019] Step 3) While the heat pump is sucking air, lift the leachate generated by the pile to the water distribution layer through the leachate pipe. The leachate adsorbs the odor gas during the downward flow, and then undergoes biological treatment through the humus soil layer. This device can simultaneously treat and purify the leachate and the odor gas. The gas is discharged after reaching the standard, and the purified water is reused or directly discharged.

[0020] Further, when the excavated materials meet the requirements of stabilization and dehydration, disassemble the exhaust device, lift the automatic film covering device, and transport the stabilized excavated materials under the film to the subsequent treatment unit; and place fresh excavated materials in the semi-closed yard of the geomembrane for excavated materials again, and repeat the cycle operation.

[0021] The beneficial effects of the system and method for rapid stabilization and dehydration of stockpiled waste excavated materials with a semi-closed geomembrane of the present invention are as follows:

[0022] (1) The semi-closed yard of the geomembrane for stockpiled waste excavated materials of the present invention can be built according to local conditions according to the site scale and terrain. And due to its semi-closed characteristics, it saves building materials, has high economy, and its internal structure is simple to manufacture. It can meet the use requirements through a simple pipeline system connection, and has the characteristics of simple installation, simple use and quick maintenance.

[0023] (2) The semi-closed yard of the geomembrane for stockpiled waste excavated materials of the present invention adopts the method of off-site aerobic stabilization. By covering the stockpiled waste with a film and ventilating and heating inside, the rapid stabilization and dehydration of the stockpiled waste are realized. On the other hand, the leachate and odor gas are collected and treated to avoid dispersion, and the problems of odor gas dispersion and leachate overflow generated by the open-air stacking of stockpiled waste are solved. Since it is a semi-closed yard, it avoids a large amount of leachate generated by the stockpiled waste being washed by rainwater and reduces the treatment volume of the leachate.

[0024] (3) Through the construction of the overall system facilities, the present invention collaboratively treats the malodorous gases and leachate generated during the off-site treatment of stockpiled garbage, and discharges them after reaching the standards; moreover, the heat released by condensation within the system and the heat generated by composting are recycled, reducing the use of energy while meeting the heat usage requirements.

[0025] (4) The present invention adopts a new type of heat pump technology, which is an energy-saving device that uses high-level energy to make heat flow from a low-level heat source (air) to a high-level heat source, further reducing the operating costs. Description of the Drawings

[0026] Figure 1 It is a cross-sectional view of a semi-closed placement site for geomembrane of stockpiled garbage excavation materials;

[0027] Figure 2 It is a schematic diagram of a semi-closed rapid and stable dehydration system for geomembrane of stockpiled garbage excavation materials;

[0028] Figure 3 It is a cross-sectional view of the membrane end device;

[0029] Among them: 1 - pipeline trench; 2 - air duct; 3 - leachate pipe; 4 - hot water pipe; 5 - hardened ground; 6 - membrane end device; 7 - perforated plate; 8 - light-transmitting membrane; 9 - insulation layer; 10 - semi-closed workshop; 11 - detachable exhaust device; 12 - electric hoist; 13 - sunlight tile; 14 - humus soil treatment device; 15 - heat pump; 16 - semi-closed placement site for geomembrane of stockpiled garbage excavation materials; 17 - supporting layer; 18 - humus soil layer; 19 - water distribution layer; 20 - box body main body;

[0030] 21 - 12# screw; 22 - 12# nut; 23 - heavy mass; 24 - pressing plate. Detailed Embodiments

[0031] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the specification.

[0032] Embodiment 1:

[0033] The semi-closed rapid and stable dehydration system for geomembrane of stockpiled garbage excavation materials includes a semi-closed placement site 16 for geomembrane of stockpiled garbage excavation materials, a heat pump 15, a humus soil treatment device 14, and a pipeline structure.

[0034] Among them, as Figure 1 shown, the semi-closed placement site 16 for geomembrane of stockpiled garbage excavation materials includes a pipeline trench 1, an air duct 2, a leachate pipe 3, a hot water pipe 4, a hardened ground 5, a membrane end device 6, a perforated plate 7, a light-transmitting membrane 8, an insulation layer 9, a semi-closed workshop 10, a detachable exhaust device 11, an electric hoist 12, and a sunlight tile 13.

[0035] The semi - enclosed plant building 10 is designed according to the daily treatment volume and the requirements of stable and dewatered stockpiled garbage, and its structure needs to meet the requirements of strength, stiffness and stability. The semi - enclosed plant building 10 has no four walls and is in a ventilated state.

[0036] The top of the semi - enclosed plant building 10 uses sunlight tiles 13, which can project sunlight, form a certain greenhouse effect, make full use of solar energy and increase the temperature of the heap body.

[0037] The semi - enclosed plant building 10 is set on the hardened ground 5, and the hardened ground 5 is determined according to the driving load of the vehicle. A pipeline trench 1 is built under the hardened ground 10. The number of pipeline trenches 1 needs to be determined according to the generation amount of leachate from the stockpiled garbage, the required air intake and the required heat. The depth of the pipeline trench 1 needs to meet the elevation requirements of the pipelines. A perforated plate 7 is laid on the pipeline trench 1. The upper surface of the perforated plate 7 is flush with the hardened ground 5, which does not affect the driving of the vehicle. And gravel is filled in the pipeline trench 1. On the one hand, it increases the porosity and does not affect the circulation of gas and water. On the other hand, it transfers the load. Leachate pipes 3, air pipes 2 and hot water pipes 4 are laid in the pipeline trench 1 according to the elevation requirements.

[0038] Specifically, in the pipeline trench 1 from bottom to top are the leachate pipes 3, air pipes 2 and hot water pipes 4. The materials of the above pipelines are all corrosion - resistant materials and have sufficient strength and stiffness. The leachate pipes 3, air pipes 2 and hot water pipes 4 are respectively used to collect the leachate generated by the stockpiled garbage, provide circulating air and the heat required for heating. The leachate pipe 3 is interconnected with the water distribution layer 19 of the humus soil treatment device 14.

[0039] The stockpiled garbage excavation geomembrane semi - enclosed disposal site 16 is evenly divided into multiple independent treatment units in the planar space. There is a space for vehicle driving between treatment units, which does not affect the transfer of the stockpiled garbage. In each treatment unit: a light - transmissive film 8 and a heat - insulating layer 9 (the light - transmissive film 8 and the heat - insulating layer 9 are closely attached together) are laid on the garbage excavation to be treated. At the four vertices of the light - transmissive film 8 and the heat - insulating layer 9, they are connected into a whole through the film end device 6. A plurality of electric hoists 12 are provided on the top of the semi - enclosed plant building 10. The electric hoists 12 respectively correspond to and are connected to the positions of 4 film end devices 6 and the center of the film. By rotating the electric hoists 12, the film end devices 6 are lifted and lowered, so as to realize the lifting and lowering of the light - transmissive film 8.

[0040] The structure of the film end device 6 is as Figure 3As shown in the figure, it includes a heavy block 23, a 12# screw 21, a 12# nut 22 and a pressing plate 24. A part of the space on the side of the heavy block 23 is hollowed out, and the light-transmitting film 8 and the heat-insulating layer 9 can be placed in this space. A plurality of holes for the 12# screw 21 are opened at the top corresponding to the center line of the hollowed-out part of the heavy block 23, and the 12# nut 22 is welded on the holes. After the light-transmitting film 8 and the heat-insulating layer 9 are placed, the pressing plate 24 is pressed on the heat-insulating layer 9, and the 12# screw 21 is tightened so that the light-transmitting film 8, the heat-insulating layer 9 and the film end device 6 are connected into a whole.

[0041] A detachable air extraction device 11 is provided at the center of the light-transmitting film 8. The detachable air extraction device 11 is disassembled when the light-transmitting film 8 is lifted and reinstalled for use when the light-transmitting film 8 is lowered.

[0042] In this embodiment, the setting of the semi-closed landfill site 16 for stockpiled waste excavation materials is for two purposes. One is to block rainwater to prevent rainwater from leaching the stockpiled waste and generating new leachate. The other is to allow light to pass through, forming a certain degree of greenhouse effect to increase the temperature of the landfill body.

[0043] Among them, as Figure 2 shown, the humus soil treatment device 14 includes a supporting layer 17, a humus soil layer 18, a water distribution layer 19, and a box body 20. A pipeline system is laid inside the box body 20, and the pipeline system includes inlet water, outlet water, inlet air, outlet air, and a hot water pipe 4.

[0044] The humus soil treatment device 14 is made of a carbon steel box body 20 or other materials with the same strength. Inside, from bottom to top, there are a supporting layer 17, a humus soil layer 18, and a water distribution layer 19.

[0045] The water distribution layer 19 uses a perforated water distribution pipe for water distribution. The supporting layer 17 uses gravel materials, and the humus soil layer 18 is provided with humus soil. To achieve the effect of simultaneously treating and purifying leachate and odor gas, it is through the internal pipeline layout of the box body 20 and the way of inlet air, inlet water, outlet air, and outlet water. The odor gas is adsorbed by the leachate, and then the leachate flows downward through the biological treatment of the humus soil layer 18 (finally, the treated leachate is reused as reclaimed water), and finally the effect of simultaneously treating and purifying leachate and odor gas is achieved.

[0046] Hot water pipes 4 are laid in the humus soil layer 18 and the supporting layer 17. The hot water pipes 4 have a large surface area and can exchange heat with the humus soil layer 18 and the supporting layer 17 to meet the requirements of heat recovery and utilization. The hot water pipes 4 in the humus soil treatment device 14 are connected to the hot water pipes 4 in the semi-closed landfill site 16 for stockpiled waste excavation materials to form a circulating flow.

[0047] The detachable exhaust device 11 inside the semi-closed placement site 16 of the stockpiled waste excavation is connected to the heat pump 15 through a pipeline, and the heat pump 15 is connected to the humus soil treatment device 14 through a pipeline. Specifically, the detachable exhaust device 11 is connected to the air inlet of the heat pump 15, and the air outlet of the heat pump 15 is connected to the air inlet of the humus soil treatment device 14.

[0048] The semi-closed placement site 16 of the stockpiled waste excavation collects the leachate through the leachate pipe 3 and then lifts it to the humus soil treatment device 14 through a submersible pump.

[0049] Embodiment 2:

[0050] As Figure 2 shown, a method of operating using the semi-closed rapid and stable dehydration system for stockpiled waste excavation of Embodiment 1 is as follows:

[0051] A. Divide the space of the semi-closed placement site 16 of the stockpiled waste excavation into even space blocks according to the daily treatment volume required and the requirements for the stability and dehydration of the stockpiled waste.

[0052] B. Taking a single space block as an example, place the freshly excavated material in the single space block. After the single space block reaches its capacity, use machinery to trim the shape of the stockpiled waste. After trimming, lower the film end device 6, lower the light-transmitting film 8 and the thermal insulation layer 9 to cover the freshly excavated material. Install the detachable exhaust device 11 and turn on the heat pump 15 to suck the excavated material pile. The light-transmitting film 8 and the thermal insulation layer 9 are tightly tightened on the pile due to the negative pressure, and the film end device 6 compacts the edge, so that only dry air can enter the pile through the air duct 2. The leachate generated by the pile is collected through the leachate pipe 3.

[0053] C. The heat pump 15 heats the sucked wet gas and sends it into the humus soil treatment device 14 to increase the intake air temperature of the humus soil treatment device 14. The intake air passes through the humus soil layer 18, and the gas condenses and releases heat. The condensed water flows downward, and the low-temperature gas goes upward. The released heat and the heat generated by the composting of the humus soil layer 18 exchange heat with the hot water pipe 4 in the humus soil layer 18 to increase or maintain the temperature of the hot water pipe 4. Due to the circulation of the hot water pipe 4, in the semi-closed placement site 16 of the stockpiled waste excavation, the hot water pipe 4 exchanges heat with the intake air of the air duct 2 to increase the temperature of the pile and accelerate the stability and dehydration rate of the pile.

[0054] D. While the heat pump 15 intakes air, lift the leachate to the water distribution layer 19 of the humus soil treatment device 14 through a submersible pump, make full use of the treatment capacity of the humus soil treatment device 14, so that the leachate and the malodorous gas are treated and purified simultaneously, the gas meets the standards and is discharged, and the purified water is reused or directly discharged.

[0055] E. After the stockpiled garbage meets the requirements of stabilization and dehydration, disassemble the detachable exhaust device 11, lift the light-transmitting film 8 and the thermal insulation layer 9, transport the stabilized stockpiled garbage under the light-transmitting film 8 to the subsequent treatment unit, and continue to place fresh stockpiled garbage in a single space. Lower the light-transmitting film 8 and the thermal insulation layer 9, install the detachable exhaust device 11, start the system, and run in subsequent cycles.

[0056] The above are only the preferred embodiments of the present invention and do not constitute a limitation on the protection scope of the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A system for semi-closed rapid and stable dehydration of stockpiled waste excavation materials by geomembrane, characterized in that, The system includes a semi-closed disposal site for excavated materials with geomembrane, a heat pump, and a humus soil treatment device; The semi-closed disposal site for excavated materials with geomembrane includes a semi-closed workshop where the excavated materials are stacked; a pipe trench is provided below the semi-closed workshop, and a leachate pipe, an air duct, and a hot water pipe are arranged in the pipe trench; the air duct and the leachate pipe communicate with the excavated materials; an automatic film covering device and an exhaust device are arranged in the semi-closed workshop to cover the excavated materials with film and suck air, and the exhaust device is sequentially connected to the heat pump and the humus soil treatment device; The humus soil treatment device includes a supporting layer, a humus soil layer, a water distribution layer, and a hot water pipe. The hot water pipe is laid in a serpentine shape in the humus soil layer and the supporting layer, and the hot water pipe communicates with the hot water pipe below the semi-closed workshop to form a circulation; the humus soil treatment device communicates with the leachate pipe, and the leachate pipe communicates with the water distribution layer.

2. The system for semi-closed, rapid and stable dehydration of geomembrane of stockpiled waste excavation materials as claimed in claim 1, wherein, The semi-closed disposal site for excavated materials with geomembrane is divided into several independent treatment units, and each treatment unit includes the automatic film covering device and the exhaust device.

3. The system for semi-closed, rapid and stable dehydration of geomembrane for stockpiled waste excavation materials according to claim 1 or 2, characterized in that, The automatic film covering device includes a film end structure, an electric lifting structure, and a light-transmitting film. Film end structures are provided at the four corners of the light-transmitting film, and an electric lifting structure is provided at the top of the semi-closed workshop, and the electric lifting structure is connected to the film end structure.

4. The system for semi-closed rapid and stable dehydration of geomembrane for stockpiled waste excavation materials as described in claim 3, wherein The detachable exhaust device is arranged on the light-transmitting film.

5. The system for semi-closed rapid and stable dehydration of geomembrane for stockpiled waste excavation as described in claim 3, characterized in that, The film end structure includes a heavy mass, a screw, a nut, and a pressing plate. There is a hollow space on the side of the heavy mass, a hole is provided on the top surface of the heavy mass and at the top of the hollow space, a nut is fixedly arranged above the hole, the screw can be placed in the hole, and the pressing plate is arranged between the bottom of the screw and the light-transmitting film.

6. The system for semi-closed rapid and stable dehydration of geomembrane for stockpiled waste excavation materials as claimed in claim 1 or 2, wherein The top of the semi-closed workshop uses sunlight tiles. The leachate pipe, the air duct, and the hot water pipe are arranged from bottom to top in the pipe trench, and a perforated plate is laid above the pipe trench, and the perforated plate is flush with the ground of the semi-closed workshop.

7. The system for semi-closed, rapid and stable dehydration of geomembrane of stockpiled waste excavation materials according to claim 1 or 2, characterized in that The humus soil treatment device is sequentially provided with the supporting layer, the humus soil layer, and the water distribution layer from bottom to top.

8. Method for semi-closed rapid and stable dehydration of geomembrane for stockpiled waste excavation materials, characterized in that, The method includes: Step 1) After placing the excavated materials in the semi-closed disposal site for excavated materials with geomembrane and reaching the set capacity, use the automatic film covering device to cover the excavated materials with film and install the exhaust device, turn on the heat pump, suck the excavated material heap, and the covered film tightly tightens the heap due to negative pressure, so that dry air can only enter the heap through the air duct, and the leachate generated by the heap flows down due to gravity and is collected through the leachate pipe; Step 2) The heat pump heats the sucked wet gas and sends it into the humus soil treatment device. The high-temperature wet inlet gas passes through the humus soil layer, the gas condenses and releases heat, the condensed water flows downwards, the low-temperature gas goes upwards, and the released heat and the heat generated by the composting of the humus soil layer exchange heat with the hot water pipe in the humus soil layer to increase or maintain the temperature of the hot water pipe; because the two hot water pipes are connected in circulation, in the semi-closed disposal site for excavated materials with geomembrane of the stockpiled waste, the hot water pipe exchanges heat with the air inlet of the air duct to increase the temperature of the heap and accelerate the stabilization and dehydration rate of the heap; Step 3) While the heat pump takes in air, lift the leachate generated by the heap body to the water distribution layer through the leachate pipe. During the downward flow of the leachate, foul odor gases are adsorbed, and then it undergoes biological treatment in the humus soil layer. This device can simultaneously treat and purify the leachate and foul odor gases. The gases are discharged after reaching the standards, and the purified water is either reused or directly discharged.

9. The method for semi-closed rapid and stable dehydration of geomembrane for stockpiled waste excavation materials as claimed in claim 8, wherein, After the excavated material meets the requirements of stability and dehydration, disassemble the exhaust device, lift the automatic film covering device, and transport the stabilized excavated material under the film to the subsequent treatment unit; and place fresh excavated material in the semi-closed geotextile membrane yard for the excavated material again, and repeat the cycle operation.

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