A method of landfilling stabilized fly ash

Abstract

The application provides a landfill method for stabilizing fly ash, comprising a landfill yard for landfilling fly ash, while the fly ash is stacked to form a stack in the landfill yard, and the method comprises the following steps: S1, protecting and dividing the landfill yard; S2, laying a bottom film for welding on the landfill yard; S3, setting a sub-unit dam and a movable water retaining dam before landfilling; S4, welding and coating the top surface and the side surface of the stack; and S5, daily welding or daily coating the advancing surface of the stack according to the rainfall of the next day. The bottom film is laid on the bottom of the landfill yard, and the bagged fly ash is welded and coated as a whole in the form of daily coating and daily welding, and the sub-unit dam and the movable water retaining dam are set to block the water accumulated in the bottom of the yard from entering the stack, so that the output of the leachate is zero, and the environmental pollution risk of fly ash landfilling is greatly reduced.

Description

Technical Field

[0001] This invention relates to the field of environmental protection technology, and in particular to a method for landfilling stabilized fly ash. Background Technology

[0002] Fly ash is one of the main byproducts of waste incineration, containing pollutants such as heavy metals and dioxins that are harmful to the environment and human health. After being landfilled, the toxic and harmful substances in fly ash can migrate to the bottom of the landfill via rainwater entering the landfill, forming leachate that is extremely harmful to the groundwater environment. Direct rainfall accounts for the vast majority of leachate sources; therefore, taking measures to prevent rainwater from entering the landfill is the fundamental solution to leachate generation. Traditional measures to reduce leachate generation include: setting up zoned and unitized dikes, avoiding operations during rainy days, and implementing daily and intermediate covering. Specifically, by stacking fly ash bags or soil to a certain height to form dikes, the landfill is divided into several zones and operating units. After each day's landfilling is completed, HDPE membrane is used to cover the landfilled area. This method can prevent rainwater from falling into the reservoir, but it cannot prevent water from accumulating at the bottom of the reservoir from entering the reservoir. In fact, due to the seepage prevention structure at the bottom of the reservoir, it is common for water to accumulate rapidly at the bottom of the reservoir and flow into the reservoir during heavy rainfall, especially during the summer and autumn rainy seasons. When a large amount of rain accumulates at the bottom of the reservoir in a short period of time, it is impossible to quickly pump out the water. Therefore, the traditional landfill rainwater and sewage separation method cannot truly achieve zero leachate generation.

[0003] Therefore, it is necessary to provide a landfill method for stabilizing fly ash to solve the above-mentioned technical problems. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides a method for stabilizing fly ash for landfilling. By packaging the fly ash in ton bags and laying a bottom membrane at the bottom of the landfill area, and employing a combination of daily covering and daily welding, the leachate production is reduced to zero, significantly lowering the cost of fly ash landfilling and solving the environmental pollution problem caused by existing fly ash disposal methods.

[0005] The present invention provides a landfill method for stabilizing fly ash, comprising a landfill area for landfilling fly ash, wherein the fly ash is piled up in the landfill area to form a stockpile, and the landfill method includes the following steps:

[0006] S1: Protect and delineate the landfill area:

[0007] An impermeable layer is installed at the bottom and slope of the landfill area, and a protective structure is installed on the impermeable layer.

[0008] The landfill area is divided into several sub-areas using partition dikes;

[0009] S2: Lay a base membrane for welding on the landfill area:

[0010] A bottom membrane for welding is laid on the protective structure of the bottom and slope of the landfill area, and the bottom membrane is covered on the partition dike.

[0011] S3: Before filling the pile, install sub-unit dikes and movable dams, and during filling, ensure that the pile is close to the sub-unit dikes.

[0012] A sub-unit dike is set up along the landfill advancement direction parallel to the pile body, and the sub-unit dikes are used to separate landfill sub-areas to form landfill units;

[0013] A mobile water-retaining dam is set up along the landfill advancement direction perpendicular to the pile body, and the mobile water-retaining dam is set at a preset distance, wherein the preset distance is the estimated distance the pile body will advance forward on that day;

[0014] S4: Weld and cover the top and side surfaces of the stack:

[0015] The sides and top of the stack, excluding the advancing surface, are covered with a covering film, and the bottom edge of the covering film on the sides is welded to the bottom film or the sub-unit dike.

[0016] S5: Based on the next day's rainfall, perform daily welding or daily covering on the propulsion surface of the pile body;

[0017] If the rainfall on the next day is less than the set threshold for the next day's rainfall, then the advancing surface of the pile body will be covered daily with a daily covering film, and the daily covering film will be placed on the set mobile dam and sub-unit dike.

[0018] If the rainfall on the next day is not less than the set threshold for the next day's rainfall, then no landfill will be carried out on the next day, and the advancing surface of the pile will be covered with a daily welding membrane, and the junction of the daily welding membrane with the covering membrane and the bottom membrane will be welded.

[0019] Preferably, the width of the landfill unit is determined according to the pile to be landfilled, and the length is equal to the length of the landfill sub-area.

[0020] Preferably, both the mobile dam and the modular dike include multiple sequentially connected water-retaining plates and a water-retaining membrane. Each water-retaining plate includes a vertical plate and a horizontal plate integrally formed on the side of the vertical plate, with the horizontal plate resting on the bottom membrane.

[0021] The water-blocking membrane covers the water-blocking plate, and the water-blocking membrane is an HDPE smooth film.

[0022] Preferably, the steps for setting up the sub-unit dikes include:

[0023] a. Determine the location of the sub-unit dikes based on the preset width requirement of the landfill unit;

[0024] b. Multiple water-blocking plates are arranged sequentially along the landfilling advancement direction parallel to the pile body to form a support for the pile body;

[0025] c. Attach the water-blocking membrane tightly to the water-blocking plate, and weld the bottom edge of the water-blocking membrane to the base membrane.

[0026] Preferably, the steps for setting up the mobile dam include:

[0027] a. Determine the location of the mobile dam based on the advancing area of ​​the pile body on that day;

[0028] b. Multiple water-retaining plates are arranged sequentially along the landfilling advance direction perpendicular to the pile body to form a mobile water-retaining dam and support the pile body;

[0029] c. Attach the water-blocking membrane tightly to the water-blocking plate, and weld the bottom edge of the water-blocking membrane to the base membrane.

[0030] Preferably, the base film is an HDPE smooth film, and the base film is welded to the cover film, the water-retaining film of the sub-unit dike and / or the welding film by a double-seam heat-sealing welding method.

[0031] Preferably, the welding film is an HDPE glossy film.

[0032] Preferably, the daily covering film is an HDPE film.

[0033] Preferably, the landfill method also includes:

[0034] When landfilling is required the following day, the daily covering film on the advancement surface of the pile should be removed.

[0035] Alternatively, the daily welding membrane can be cut along the bottom of the reservoir and rolled back, and then used to continue filling along the existing pile. The cut daily welding membrane can continue to cover the top surface of the newly filled pile, and a covering membrane can be welded to the side of the daily welding membrane to cover the top and side surfaces of the newly filled pile.

[0036] Compared with related technologies, the landfill method for stabilizing fly ash provided by the present invention has the following beneficial effects:

[0037] This invention lays a bottom membrane at the bottom of the landfill area and welds the bagged fly ash into a pile for overall encapsulation by combining daily covering and welding. At the same time, it sets up unit dikes and mobile water-retaining dams to isolate the water at the bottom of the landfill from the pile, preventing water from entering the pile from the bottom. This truly achieves zero leachate production and greatly reduces the environmental pollution risk of fly ash landfill. Attached Figure Description

[0038] Figure 1 A top view of the landfill area for a landfill method for stabilizing fly ash provided by the present invention;

[0039] Figure 2 A schematic diagram of the location of a movable baffle plate in a landfill method for stabilizing fly ash provided by the present invention;

[0040] Figure 3 A schematic diagram of daily covering and daily welding for a landfill method for stabilizing fly ash provided by the present invention;

[0041] The following are the labels on the map: 1. Landfill area; 1-1. Slope; 1-2. Reservoir bottom; 2. Dike between sections; 3. Dike between units; 4. Impermeable layer; 5. Protective structure; 6. Water barrier membrane; 7. Bottom membrane; 8. Stack; 9. Covering membrane; 10. Mobile dam; 11. Welded membrane; 12. Covering membrane; 13. Water barrier plate. Detailed Implementation

[0042] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0044] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0045] This invention provides a method for landfilling stabilized fly ash, comprising the following steps:

[0046] S1: Protect and delineate the landfill area 1.

[0047] Among them, reference Figure 3 As shown, the protective measures are to install an impermeable layer 4 at the bottom 1-2 and slope 1-1 of the landfill area 1, and to install a protective structure 5 on the impermeable layer 4. Specifically, the protective structure 5 is a non-woven geotextile with a thickness of not less than 800g per square meter or a bagged clay with a thickness of 250mm laid on the impermeable layer 4. The bottom surface and slope 1-1 of the landfill area 1 are protected by the protective structure 5 to prevent sharp objects from piercing the impermeable layer 4. The impermeable layer 4 is an HDPE membrane.

[0048] refer to Figure 1 As shown, the zoning involves dividing the landfill area 1 into several sub-zones using partition dike 2. Specifically, before landfill operations, zoning should be rationally established through engineering and management measures. Particularly, partition dike 2 divides the landfill area 1 into several sub-zones. The height of partition dike 2 ranges from 1m to 2m, meaning it is approximately 1m to 2m higher than the bottom of the landfill, forming an area sufficient for 1-3 months of landfill volume. Figure 1 The landfill sub-area division shown is only an example. In actual implementation, the landfill area 1 needs to be divided according to the site conditions and requirements.

[0049] S2: Lay the bottom membrane 7 for welding on landfill area 1:

[0050] In step S1, an impermeable layer 4 and a protective structure 5 are set at the bottom 1-2 of the landfill area 1. Before filling the fly ash in ton bags, a bottom membrane 7 for welding needs to be laid on the protective structure 5 of the bottom 1-2 and the slope 1-1 of the landfill area 1. At the same time, it is necessary to ensure that the bottom membrane 7 covers the set partition dike 2. In addition, the bottom membrane 7 is made of HDPE smooth film, and the membrane welding is carried out by double-track hot melt welding method.

[0051] S3: Before filling the pile body 8, a sub-unit dike 3 and a movable water-retaining dam 10 are set up, and during filling, the pile body 8 is made to be close to the sub-unit dike 3.

[0052] A sub-unit dike 3 is set up along the landfill advancement direction parallel to the pile body 8, and the landfill sub-areas are separated by the sub-unit dike 3 to form a landfill unit.

[0053] Specifically, there are two ways to set up the unit-level dike 3. One is to take the slope 1-1 as the starting point and set it along the direction perpendicular to the slope 1-1. This method corresponds to the direction of the advance of the pile body 8 being perpendicular to the slope 1-1. The other is to take the partition dike 2 as the starting point and set it along the direction perpendicular to the partition dike 2. This method corresponds to the direction of the advance of the pile body 8 being perpendicular to the partition dike 2.

[0054] Finally, by dividing the landfill sub-areas into sub-unit dikes 3, landfill units are formed. The width of the landfill unit is determined by the landfill volume of the landfill unit in the early stage, and the length is equal to the length of the landfill sub-area.

[0055] In addition, the height of the unit dike 3 ranges from 0.5m to 1m, that is, the unit dike 3 is about 0.5m to 1m higher than the bottom of the reservoir 1-2, so as to form an area that can meet the landfill volume for 1-2 weeks.

[0056] refer to Figure 2 As shown, a mobile water barrier 10 is set along the landfill advancement direction perpendicular to the pile body 8, and the mobile water barrier 10 is set at a preset distance, wherein the preset distance is the estimated distance that the pile body 8 will advance on that day.

[0057] Specifically, in order to accommodate the amount of landfill 8 on that day, a mobile water barrier 10 can be set up according to the estimated distance that landfill 8 will advance on that day. Before landfilling on that day, the mobile water barrier 10 will be separated from the advancing surface of landfill 8 on the previous day. After landfilling is completed on that day, the advancing surface of landfill 8 will be close to the mobile water barrier 10.

[0058] In this embodiment, both the mobile dam 10 and the unit dike 3 have multiple water-blocking plates 13 and water-blocking membranes 6 connected in sequence. The water-blocking plate 13 includes a vertical plate and a horizontal plate integrally formed on the side of the vertical plate. The horizontal plate rests on the bottom membrane 7. In order to connect the water-blocking plates 13 in sequence, slots and inserts can be provided on the two sides of the vertical plate respectively. The insert of the previous water-blocking plate 13 is inserted into the slot of the next water-blocking plate 13 by means of vertical insertion.

[0059] The water-blocking membrane 6 covers all the water-blocking plates 13, and the water-blocking membrane 6 is an HDPE smooth film.

[0060] After the sub-unit dike 3 and the mobile dam 10 are set up, the fly ash in ton bags is transported to the site. Then, the fly ash in ton bags is unloaded and short-hauled. Finally, the fly ash in ton bags is hoisted and piled up.

[0061] Through unloading and short-haul transportation, fly ash in ton bags can be transferred and transported to landfill area 1 in an orderly manner. This effectively manages the flow of fly ash, prevents dust and leakage, and ensures the safety and environmental sustainability of the landfill process.

[0062] During the initial hoisting operation, the edge road of landfill area 1 can be used as a hoisting platform. As the landfill operation extends into the landfill area, a dedicated hoisting platform can be set up within landfill area 1. The width of the platform should be at least 0.5m wider on each side than the width of the crane support frame after it extends. The hoisting platform can be laid with steel plate roadbed boxes or with precast thickened concrete slabs.

[0063] Before the landfill begins, a platform road is laid in advance to facilitate the hoisting of ton bags. During hoisting, one bag is hoisted at a time. Finally, the ton bags containing fly ash are stacked to form a pile 8.

[0064] As the stack body 8 extends, in order to meet the needs of hoisting operations, the stack body 8 of stabilized fly ash should be leveled and compacted first, and then steel plate roadbed boxes or thickened concrete flat plates should be laid on it. An access road should be set up on the stack body 8 to meet the needs of short-haul vehicles of stabilized fly ash entering and leaving the storage area. The width of the access road should not be less than 6m.

[0065] S4: Weld and cover the top and side surfaces of the stack 8:

[0066] The sides and top of the stack 8, excluding the advancing surface, are covered with a covering film 9, and the bottom edge of the covering film 9 on the sides is welded to the bottom film 7 or the sub-unit dike 3.

[0067] Specifically, during the formation of the reactor body 8, a covering membrane 9 is set up to cover the sides and top of the reactor body 8. At the same time, the covering membrane 9 needs to avoid the advancing surface of the reactor body 8. The bottom edge of the covering membrane 9 is welded together with the bottom membrane 7 and the water-retaining membrane 6 of the sub-unit dike 3 using a double-seam heat-sealing welding method to achieve sealing of the sides and top of the reactor body 8 except for the advancing surface.

[0068] In this embodiment, the configuration of the unit-type dike 3 differs slightly from that of the movable dam 10. The configuration method of the unit-type dike 3 is as follows:

[0069] a. Determine the setting position of the sub-unit dike 3 according to the preset width required by the landfill unit. That is, the width required by the landfill unit is determined in the early stage, and the position of the sub-unit dike 3 is set according to this requirement.

[0070] b. Multiple water baffles 13 are arranged in sequence along the landfilling advancement direction parallel to the pile body 8 to form a support for the pile body 8;

[0071] c. Attach the water-blocking membrane 6 tightly to the water-blocking plate 13, and weld the bottom edge of the water-blocking membrane 6 to the bottom membrane 7.

[0072] The method for setting up the mobile dam 10 is as follows:

[0073] a. Determine the location of the mobile dam 10 based on the advancing area of ​​the pile 8 on that day;

[0074] b. Multiple water-blocking plates 13 are arranged in sequence along the landfilling advancement direction perpendicular to the pile body 8 to form a mobile water-blocking dam 10 and support the pile body 8;

[0075] c. Attach the water-blocking membrane 6 tightly to the water-blocking plate 13, and weld the bottom edge of the water-blocking membrane 6 to the bottom membrane 7.

[0076] S5: Based on the rainfall of the next day, the advancing surface of the pile body 8 shall be welded or covered daily;

[0077] If the rainfall on the next day is less than the set threshold for the next day's rainfall, the advancing surface of the pile body 8 will be covered by the daily covering film 12, and the daily covering film 12 will be covered on the set mobile dam 10 and the sub-unit dike 3.

[0078] If the rainfall on the next day is not less than the set threshold for the next day's rainfall, then no landfill will be carried out on the next day, and the advancing surface of the pile body 8 will be covered with a daily welding membrane 11, and the junction of the daily welding membrane 11 with the covering membrane 9 and the bottom membrane 7 will be welded.

[0079] In addition, in the event of an emergency the following day, such as when no precipitation is predicted for the next day but heavy rain suddenly falls during the landfilling process, the landfilling should be stopped immediately, and the advancing surface of the pile body 8 should be covered with the daily covering film 12. The daily covering film 12 should also be placed on the mobile water barrier 10 and the sub-unit dike 3, and the film pressing blocks should be used to press it firmly at the edge of the daily covering film 12 to ensure that water does not enter the pile body 8.

[0080] The shaded areas to the right of the water-retaining plate 13 of the movable dam 10 and above the water-retaining plate 13 of the unit dike 3 are the filled areas, as shown in the figure. Figure 2 In area B shown, the left side of the water-retaining plate 13 of the movable dam 10 and the lower side of the water-retaining plate 13 of the unit dike 3 are unfilled areas. The unfilled areas are as follows: Figure 2 As shown in the diagram, area A is ultimately separated from the landfilled area by a water-blocking plate 13 covered with a water-blocking membrane 6.

[0081] Specifically, the threshold for the next day's rainfall can be set according to needs. The daily welding film 11 is an HDPE smooth film, and the daily covering film 12 is an HDPE film.

[0082] When landfilling is required the following day, the daily covering film 12 on the advancement surface of the pile 8 will be removed.

[0083] Alternatively, the daily welding membrane 11 can be cut open along the bottom 1-2 of the silo and rolled back, and then piled up along the existing pile 8. The cut daily welding membrane 11 can continue to cover the top surface of the newly buried pile 8, and a covering membrane 9 can be welded to the side of the daily welding membrane 11 to weld and cover the top and side surfaces of the newly buried pile 8.

[0084] The working principle of the landfill method for stabilizing fly ash provided by the present invention is as follows: The present invention lays a bottom membrane 7 at the bottom 1-2 of the landfill area 1, and welds the bagged fly ash into a pile 8 by combining daily covering and daily welding. At the same time, it sets up unit dikes 3 and mobile water-retaining dams 10 to block the water accumulation at the bottom 1-2 of the landfill, preventing water from entering the pile 8 from the bottom, and truly achieving zero leachate production, which greatly reduces the environmental pollution risk of fly ash landfill.

[0085] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

Claims

1. A method for landfilling stabilized fly ash, comprising a landfill area (1) for landfilling fly ash, wherein the fly ash is stacked within the landfill area (1) to form a pile (8), characterized in that, The landfill method includes the following steps: S1: Protect and delineate the landfill area (1): An impermeable layer (4) is provided at the bottom (1-2) and slope (1-1) of the landfill area (1), and a protective structure (5) is provided on the impermeable layer (4). The landfill area (1) is divided into several sub-areas by using the partition dike (2); S2: Lay a base membrane (7) for welding on the landfill area (1): A bottom membrane (7) for welding is laid on the protective structure (5) of the bottom (1-2) and slope (1-1) of the landfill area (1), and the bottom membrane (7) is covered on the partition dike (2); S3: Before filling the pile (8), set up a sub-unit dike (3) and a movable dam (10), and during filling, make the pile (8) close to the sub-unit dike (3): A sub-unit dike (3) is set up along the landfill advancement direction parallel to the pile body (8), and the landfill sub-areas are separated by the sub-unit dike (3) to form a landfill unit; A mobile dam (10) is set up along the landfilling advance direction perpendicular to the pile body (8), and the mobile dam (10) is set at a preset distance, wherein the preset distance is the estimated distance that the pile body (8) will advance on that day; S4: Weld and cover the top and side surfaces of the stack (8): The side and top surfaces of the pile (8) except the advancing surface are covered with a covering film (9), and the bottom edge of the covering film (9) on the side is welded to the bottom film (7) or the sub-unit dike (3). S5: Based on the rainfall of the next day, the advancing surface of the pile body (8) is welded or covered daily; If the rainfall on the next day is less than the set threshold for the next day's rainfall, the advancing surface of the pile (8) will be covered daily with a daily covering film (12), and the daily covering film (12) will be covered on the set mobile dam (10) and the sub-unit dike (3). If the rainfall on the next day is not less than the set threshold for the next day's rainfall, then no landfill will be carried out on the next day, and the advancing surface of the pile (8) will be covered with a daily welding membrane (11), and the junction of the daily welding membrane (11) with the covering membrane (9) and the bottom membrane (7) will be welded. The mobile dam (10) and the unit dike (3) both include multiple water-blocking plates (13) and a water-blocking membrane (6) connected in sequence. The water-blocking plate (13) includes a vertical plate and a horizontal plate integrally formed on the side of the vertical plate. The horizontal plate rests on the bottom membrane (7). The water-blocking membrane (6) covers the water-blocking plate (13), and the water-blocking membrane (6) is an HDPE glossy film.

2. The landfill method for stabilizing fly ash according to claim 1, characterized in that, In step S3, the width range of the landfill unit is determined according to the pile (8) to be landfilled, and the length is equal to the length of the landfill sub-area.

3. The landfill method for stabilizing fly ash according to claim 2, characterized in that, The steps for setting up the sub-unit dike (3) include: a. Determine the location of the sub-unit dike (3) according to the preset width requirement of the landfill unit; b. Multiple water baffles (13) are arranged in sequence along the landfilling advance direction parallel to the pile body (8) to form a support for the pile body (8); c. Attach the water-blocking membrane (6) tightly to the water-blocking plate (13) and weld the bottom edge of the water-blocking membrane (6) to the bottom membrane (7).

4. The landfill method for stabilizing fly ash according to claim 1, characterized in that, The steps for setting up the mobile dam (10) include: a. Determine the location of the mobile dam (10) based on the advancing area of ​​the pile (8) on that day; b. Multiple water-blocking plates (13) are arranged in sequence along the landfilling advance direction perpendicular to the pile body (8) to form a mobile water-blocking dam (10) and support the pile body (8). c. Attach the water-blocking membrane (6) tightly to the water-blocking plate (13) and weld the bottom edge of the water-blocking membrane (6) to the bottom membrane (7).

5. The landfill method for stabilizing fly ash according to claim 1, characterized in that, The base film (7) is an HDPE smooth film. The base film (7) is welded to the cover film (9), the water-blocking film (6) of the sub-unit dike (3) and / or the welding film (11) by a double-seam heat-sealing welding method.

6. The landfill method for stabilizing fly ash according to claim 1, characterized in that, The welding film (11) is an HDPE glossy film.

7. The landfill method for stabilizing fly ash according to claim 1, characterized in that, The daily covering film (12) is an HDPE film.

8. The landfill method for stabilizing fly ash according to claim 1, characterized in that, Landfill methods also include: When landfilling is required the next day, the daily covering film (12) on the advancement surface of the pile (8) shall be removed. Alternatively, the daily welding membrane (11) can be cut open along the bottom (1-2) of the reservoir and rolled back, and then piled up along the existing pile (8). The cut daily welding membrane (11) can continue to cover the top surface of the newly buried pile (8), and a covering membrane (9) can be welded to the side of the daily welding membrane (11) to weld and cover the top and side surfaces of the newly buried pile (8).

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