JPH1190381A - Waste reclamation equipment, modification, execution and operation of existing reclamation equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide waste reclamation equipment constituted to enable the sure prevention of infiltration of rain water, etc., the sure discharge of gases generated from wastes, the placement of the reclaimed wastes under an aerobic environment and the acceleration of stabilization, and a modification method, execution method and operation method of the existing reclamation equipment. SOLUTION: Seepage control/drainage layers 10 which execute the seepage control of the leaching water bleeding out of the wastes and guides the leaching water along a plane direction are laid on a ground surface where the wastes are reclaimed. Collecting and draining pipes 15 are arranged to collect and drain the leaching water. While aerobic gas is intermittently or continuously blown out reversely from the collecting and draining ports of these collecting and draining pipes, the wastes are stacked on the seepage control/drainage layers and the collecting and draining pipes. Discharge pipes 25 capable of discharging the gases generated from the stacked wastes are arranged and the surfaces of the discharge pipes are covered with capping layers 20 having imperviousness together with the wastes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste landfill facility, a method for repairing an existing landfill facility, a construction method, and an operation method, and more particularly, to an effective method for infiltrating harmful substances from waste into the ground. The present invention relates to a waste landfill facility capable of preventing and promoting the stabilization of a landfill waste, a repair method, an installation method, and an operation method of an existing landfill facility.

[0002]

2. Description of the Related Art Conventionally, in a final landfill site, in addition to general waste, various types of waste such as incineration ash from a garbage incineration plant, sludge generated at a sewage treatment plant, industrial waste, and excavated soil from civil engineering work. Waste is subject to landfill. One of the important points in performing these landfills is to prevent environmental pollution. For example, it is important to ensure that no harmful substances elute into leachate from landfill waste and cause groundwater contamination.

[0003] Therefore, it is necessary to provide the final landfill site with a water-blocking structure on the entire bottom and a leachate drainage structure. That is, by constructing the impermeable structure and the leachate drainage structure, the leachate leached from the waste can be quickly sent to the water treatment facility in the disposal site for treatment without retaining the leachate in the landfill.

[0004] In order to prevent rainwater from penetrating into landfills, capping of landfills is also performed. Capping is a surface water-impervious structure in which a landfill-completed section is covered with a water-impervious material, and is further covered with surface soil. By performing this capping, rainwater and the like do not penetrate between landfills such as wastes, and the generation of leachate can be reduced, leaching of harmful substances can be suppressed, and leachate collection and distribution facilities and The scale of the water treatment facility can be reduced, and the size of the disposal facility can be reduced.

[0005] It has been shown that waste is transformed (stabilized) into a substance similar to that of the surrounding general soil over a long period of time after being landfilled at such a disposal site. Therefore, it is desirable to actively promote stabilization at disposal sites.

[0006]

However, if the landfill is covered by the above-described capping, rainwater can be prevented from penetrating into the waste, but the supply of water necessary for stabilizing the waste can be completely prevented. Since it is cut off, there is a problem that the stabilization of waste is delayed. In addition, when capping is performed, there is also a problem that gases (methane, carbon dioxide, nitrogen, oxygen) generated from waste cannot be sufficiently discharged.

[0007] The present invention has been made in view of such circumstances, and it is possible to reliably prevent the intrusion of rainwater and the like, to reliably discharge gas generated from waste, and to stabilize the gas. Waste landfill facilities and existing landfill facilities that can supply landfill waste in an aerobic environment and promote stabilization by supplying required moisture and air as needed The purpose of the present invention is to provide a repair method, a construction method, and an operation method.

[0008]

In order to achieve the above object, a waste landfill facility according to the present invention is laid on the ground where the waste is to be landfilled, and intercepts leachate that seeps out of the waste. A water-impervious / drainage layer that guides leachate along a planar direction; a drainage pipe arranged to collect and drain leachate drained along the water-impervious / drainage layer; A capping layer that covers the waste deposited on the combined drainage layer and the drainage pipe and prevents water from entering from outside; and a waste that is disposed inside or below the capping layer and located below. And an exhaust pipe for exhausting gas generated from the exhaust gas.

Further, the method for repairing an existing landfill facility according to the present invention includes a step of forming a plurality of intake holes in a layer of waste buried in the existing landfill facility; Covering the object with a capping layer composed of a three-dimensional net-like structure sheet and a water-blocking sheet, and arranging an exhaust pipe between the three-dimensional net-like structure sheet and the water-blocking sheet.

[0010] Further, the method for constructing a landfill facility according to the present invention provides a seepage control method for impermeable leachate seeping out of the waste on the ground where the waste is reclaimed, and guiding the leachate along a plane. A step of laying a drainage layer, and a step of arranging a drainage pipe so as to collect and drain leachate drained along the impermeable and drainage layer. Depositing waste on the impermeable and drainage layer and the drainage pipe while intermittently or continuously blowing out the gaseous gas; and A step of arranging an exhaust pipe capable of exhausting gas generated from the exhaust pipe, and covering the exhaust pipe together with the waste with a water-blocking capping layer.

Further, in the operation method of the waste landfill facility according to the present invention, the aerobic gas is blown out from the drainage port of the drainage pipe toward the landfilled waste, and exhausted from the exhaust pipe through the waste. And discharging the liquid from an exhaust port of the exhaust pipe toward the waste, and draining the waste water from the collecting and draining pipe through the waste.

In the method for constructing a landfill facility according to the present invention, it is preferable that the landfill area is divided into a plurality of sections, and the method for constructing a landfill facility according to the present invention is performed for each section.
Also, in the operation method of the waste landfill facility according to the present invention, the landfill area is divided into a plurality of sections, for each section,
It is preferable to perform the method for operating the waste landfill facility according to the present invention. That is, it is preferable to provide an independent collection / drainage pipe system and an exhaust pipe system independently for each section, and to independently spray aerobic gas and eject liquid onto the waste for each section.

Various sensors such as a gas sensor, a temperature sensor and a moisture meter are arranged in the landfill waste, and based on information from the sensors, the progress of aerobic decomposition in the waste is monitored, and the waste is aerobic. It is preferable to perform gas blowing and liquid blowing.

[0014] water barrier and draining layer the water barrier and draining layer includes a water shield sheet, it is preferable that has a three-dimensional network structure sheet that is laminated on the water-impervious sheet.

The water impermeable sheet may be any sheet which is excellent in corrosion resistance and has sufficient mechanical strength such as tensile strength and tear strength for use in a waste disposal site. A resin sheet; a rubber sheet; a material obtained by impregnating or laminating a synthetic resin or rubber such as chloroprene rubber on a base cloth such as nylon or vinylon is used. The thickness of the impermeable sheet is not particularly limited, but is preferably about 1 to 5 mm. If it is too thin, it is easily broken and there is a problem in water blocking. If it is too thick, it tends to be difficult to handle and costly. This impermeable sheet is laminated on the three-dimensional net-like structure sheet by means such as adhesion or fusion.

The three-dimensional reticulated structure sheet is formed by mating a synthetic fiber filament or a metal fiber filament in a three-dimensionally entangled manner, and is preferably made of nylon filament, and has sufficient porosity and rigidity. Preferably, the filament diameter is 0.2 to 4 mm
The degree is preferred. If the filament diameter is 0.2 mm or less, sufficient rigidity may not be imparted to the structure, and if it is 4 mm or more, the handleability and economic efficiency tend to be poor and unsuitable.

The porosity of this three-dimensional network structure sheet is 8
It is preferably at least 5%, and below this, when compressed by the load of waste, there is a tendency that the function as a filter medium becomes insufficient and the flow path of leachate becomes insufficient.

The thickness of the three-dimensional net-like structural body sheet depends on the rigidity of the structural body sheet, but is preferably about 3 to 50 mm in consideration of handleability at the time of laying. When the thickness is smaller than 3 mm, it is difficult to secure the function as a water passage, and when the thickness is larger than 50 mm, the handleability and workability are deteriorated, and the economic efficiency is also deteriorated.

The three-dimensional network structure sheet, the dynamic stiffness test value is preferably in the range of ^{15N / cm 2 · cm~150N / cm} 2 · cm. This value is 15 N / cm
^If it is smaller than ² cm, it will not be able to maintain the required porosity as a flow path for leachate when compressed by the load of the deposited waste, and if it exceeds 150 N / cm ² cm, it will be too hard to handle. This is because they tend to be inferior in sex.

A water-permeable filter medium sheet may be laminated on one side of the three-dimensional network structure sheet (the side opposite to the water-blocking sheet). The water-permeable filter medium sheet has a filter function,
The purpose of the present invention is to prevent powder, granules, rubber asphalt, earth and sand, etc. in the dumped material from entering the inside of the three-dimensional network structure sheet, and to prevent the passage in the three-dimensional network structure sheet from being blocked. The water-permeable filter medium sheet is not particularly limited, but a water-permeable woven or nonwoven fabric is used, and is made of synthetic fiber, natural fiber, glass fiber, or the like, and is preferably nylon, polyester, vinyl chloride, vinylon, or the like. Is used. This water-permeable filter medium sheet is preferably laminated on one surface of the three-dimensional network structure sheet by means such as adhesion or fusion.

Examples of the capping layer capping layer, is not particularly limited as long as it can prevent the entry of rain water from the outside, for example, it is preferably formed in the same layer as the water barrier and draining layer. However, it is preferable that the water-impervious sheet has a laminated structure sandwiched between the three-dimensional net-like structure sheets from both sides. Moreover, it is preferable that the exhaust pipes are arranged at predetermined intervals (even intervals are possible) between the lower three-dimensional net-like structure sheet and the impermeable sheet. Since the three-dimensional net-like structure sheet is excellent in air permeability, it has an action of collecting gas generated from waste disposed below on an exhaust pipe.

The current drain pipe collecting drainpipe, the leachate is drained along the water shield and draining layer to collecting waste water, for example, branched, predetermined intervals (unequal intervals on the water shield and draining layer But it is possible).
At the location where this drainage pipe is located, the impermeable and drainage layer
Preferably, it is recessed downward. The leachate collects in the depression, and the leachate can be discharged to the outside of the landfill portion through the drainage pipe.

The drainage pipe is preferably composed of a main pipe, a branch pipe, and a branch pipe. Finally, the leachate is discharged through the main pipe. The discharged leachate is preferably detoxified by a water treatment device. Since the discharged leachate is expected to be a component close to the sewage that has undergone biodegradation, it is preferable that the water treatment apparatus be subjected to physicochemical treatment in addition to biological treatment.

The collecting and draining pipe is not particularly limited, and may be formed of a synthetic resin pipe, a metal pipe, or the like. From the viewpoint of corrosion resistance, a pipe made of a synthetic resin such as polyethylene or polyvinyl chloride is preferable. The outer diameter of the collecting / draining pipe differs between the main pipe, the branch pipe, and the branch pipe, but is about 30 to 500 mm. A drainage port is formed in the drainage pipe, from which leachate flows into the pipe.

The drainage pipe is used for discharging leachate in a normal use state. In the present invention, the drainage pipe is also used as a passage for blowing out aerobic gas from a discharge port toward waste. Therefore, the outlet of the drainage pipe (the outlet of the main pipe)
The water treatment device and the gas pressure generation device are connected via the flow path switching device. The aerobic gas blown from the gas pressure generator is preferably air. Oxygen gas may be used, but air is preferred because it is inexpensive. The gas pressure is not particularly limited, and is a pressure at which the aerobic gas can be discharged from the drainage port of the drainage pipe toward the waste.

[0026] As the exhaust pipe exhaust pipe is not particularly limited, synthetic resin pipe, is composed of a metal pipe, from the viewpoint of corrosion resistance,
A tube made of a synthetic resin such as polyethylene or polyvinyl chloride is preferable. The outer diameter of the exhaust pipe is about 30 to 500 mm. An exhaust port is formed in the exhaust pipe, through which gas from waste flows into the pipe.

The gas exhausted from the exhaust pipe is subjected to detoxification processing as required. The exhaust pipe is used for exhausting gas generated from waste in a normal use state.
It is also used as a passage for discharging liquid from the exhaust port toward waste. Therefore, a forced exhaust device and a liquid pressure generating device are connected to the outlet of the exhaust pipe via a flow path switching device. The liquid sent from the liquid pressure generator is preferably water. Water may contain microorganisms that promote the spoilage of waste. The liquid pressure is not particularly limited, and is a pressure at which water can be discharged from the exhaust port of the exhaust pipe toward the waste.

Waste In the present invention, the waste is not particularly limited, and examples thereof include household waste, industrial waste, and incinerated ash. The layer of waste deposited between the water-blocking / drainage layer and the capping layer may be a single layer or a multilayer, but the total thickness is preferably about several meters to several tens of meters. If it is too thick, the effect of blowing the aerobic gas and ejecting the liquid onto the waste in the substantially enclosed space is small, and if it is too thin, the waste treatment becomes inefficient.

[0029]

According to the method for operating the waste landfill facility and the waste landfill facility according to the present invention, the impermeable / drainage layer and the drainage pipe are arranged below the waste to be landfilled.
The leachate from the waste is collected through a drainage pipe without permeating to the ground side, and is detoxified by a water treatment device or the like.

Since the upper side of the landfill waste is covered with a capping layer having a water barrier, rainwater and the like do not enter the waste from the outside. Moreover,
Gas generated from the waste (e.g., putrid odor gas) is quickly exhausted to the outside through an exhaust pipe arranged inside or below the capping layer. Then, intermittently, through the exhaust pipe, a liquid such as water is blown toward the waste, and through the drainage pipe, an aerobic gas such as air is blown toward the waste, thereby forming a water-blocking / drainage layer. The waste, which is substantially enclosed with the capping layer, is placed in an aerobic atmosphere. Thereby, the biological action of the decomposable organic matter in the waste can be enhanced, the corrosion of the waste can be accelerated, and the stabilization of the waste can be promoted.

In the method for constructing a waste landfill facility according to the present invention, the aerobic gas is intermittently or continuously blown out from the drainage port of the drainage pipe during the landfill, so that the aerobic gas is discharged into the waste. A gas passage is formed, which facilitates the passage of the aerobic gas into the waste when stabilizing the waste.

In the method for operating a landfill facility and the method for operating a landfill facility according to the present invention, the landfill area is divided into a plurality of sections, and the landfill and stabilization are performed for each section.
The management according to the state of the waste in each section can be performed, and the stabilization of the waste can be efficiently promoted. That is, since landfilling and management are performed for each section, the amount of leachate treatment water can be reduced as a whole, and load fluctuation in the leachate treatment device can be prevented.
In addition, the quality of the leachate can be homogenized. In addition, a drainage pipe system (including a water treatment device), an exhaust pipe system (including a forced exhaust device), a gas pressure generator, and a liquid pressure generator are provided for each section, and these devices are operated independently. Can be reduced in size. Further, delicate stabilization control can be performed for each section.

In the present invention, various sensors such as a gas sensor, a temperature sensor, and a moisture meter are disposed in a landfill waste, and an output signal from these sensors is monitored to detect a progress degree of decomposition of the organic matter. Can be
A qualitative understanding of stabilization is possible. That is, since the output signals from these sensors serve as an index for performing a stabilizing operation such as spraying of aerobic gas onto a waste and ejection of a liquid, when a stabilizing operation is performed based on these output signals, Waste can be efficiently stabilized.

In the method for repairing existing landfill equipment according to the present invention, since the upper side of the landfilled waste is covered with a capping layer having a water barrier, rainwater does not enter the waste from the outside. . In addition, gas generated from the waste (e.g., putrid odor gas) is collected in the exhaust pipe by the three-dimensional net structure sheet disposed inside the capping layer, and is quickly exhausted to the outside through the exhaust pipe. Then, intermittently, by blowing out liquid such as water through the exhaust pipe toward the waste, and by blowing out aerobic gas such as air toward the waste through the drainage pipe of the existing landfill facility. The waste material, which is substantially enclosed by the lower impermeable layer and the capping layer, is placed in an aerobic atmosphere. Thereby, the biological action of the decomposable organic matter in the waste can be enhanced, the corrosion of the waste can be accelerated, and the stabilization of the waste can be promoted.

[0035]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments shown in the drawings.

FIG. 1 is a schematic cross-sectional view of a waste landfill facility according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of a main part of a seepage and drainage layer shown in FIG. 1, and FIG. 3 is a capping shown in FIG. FIG. 4 is a schematic view showing a facility for stabilizing waste, FIG. 5 is a schematic cross-sectional view for explaining waste stabilization, and FIGS. 6 (A) to 6 (C). FIGS. 7A to 7C are schematic diagrams showing a method of performing landfill for each section.

As shown in FIG. 1, in order to construct the waste landfill facility 1 according to the present embodiment, first, a hole is dug in the ground 3, and along the bottom of the hole, the impermeable and drainage layer 10 is formed. Laying. At this time, as shown in FIG. 2, a leveling layer 4 made of sand, gravel, or the like is laid on the base rock constituting the ground 3 at the bottom of the hole. The average thickness of the leveling layer 4 is not particularly limited, but is preferably about 300 to 1000 mm. On this leveling layer 4, a water blocking / draining layer 10
Laying.

The water-blocking / drainage layer 10 includes a water-blocking sheet 5 and a three-dimensional net-like structure sheet 6 laminated on the water-blocking sheet 5. In the present embodiment, the water-blocking sheet 5 is made of a synthetic rubber sheet having a thickness of 1.5 mm, and prevents seepage water from penetrating into the ground 3. In the present embodiment, the three-dimensional net-like body sheet 6 is formed by mating synthetic fiber filaments such as nylon filaments in a three-dimensionally entangled manner, and has a sufficient porosity and rigidity.
Each filament diameter in the three-dimensional net-like body sheet 6 is 1 mm in the present embodiment.

The porosity of this three-dimensional network structure sheet 6 is as follows:
In the present embodiment, it is 90%, and even if compressed by the load of waste, a void remains and a liquid flow path along the ground is secured.

The thickness of the three-dimensional net-like structural body sheet is 4 mm in the present embodiment, so that the function as a water passage is easily ensured, and the handleability and workability are good.

The three-dimensional network structure sheet of the present embodiment has a dynamic rigidity test value of 15 N / cm ² · cm to 150 N / c.
It is within the range of m ² · cm, and can maintain the necessary porosity as a flow path for leachate even when compressed by the load of the deposited waste, and has appropriate softness and is easy to handle.

As shown in FIG. 2, recesses 7 are formed at predetermined intervals (or at irregular intervals) in the water-blocking / drainage layer 10, and collection / drainage pipes 15 are arranged in the recesses 7. . A protective layer 11 is provided on the drainage pipe 15 and the impermeable and drainage layer 10.
Is laid. The protective layer 11 is made of sand or the like,
Its thickness is about 300 to 1000 mm. The protective layer 11 has a function of protecting the water-shielding / drainage layer 10 and the drainage pipe 15 from waste. On this protective layer 11, the waste 2 is deposited as shown in FIG.

The layer of the waste 2 may be a single layer or a plurality of waste layers 2a and 2b as shown in FIG. The type of the waste 2 is not particularly limited, and household waste,
Industrial waste and the like can be exemplified. In this embodiment, the thickness of the deposited waste 2 is about 5 to 20 m. If it is too thick, the effect of blowing the aerobic gas and ejecting the liquid onto the waste in the substantially enclosed space is small, and if it is too thin, the waste treatment becomes inefficient.

The collecting and draining pipes 15 shown in FIGS. 1 and 2 are arranged in a branched manner on the impermeable and drainage layer, and are composed of a main pipe, a branch pipe, and a branch pipe. The leachate oozing out of the waste 2 flows through the gaps of the three-dimensional net-like structure sheet 6 of the impermeable and drainage layer 10 and collects in the concave portion 7, and is collected and drained.
From the collecting and draining port of the branch pipe and the branch pipe, and finally discharged through the main pipe. The drainage port of the drainage pipe 15 is formed by making a hole penetrating into the pipe on the peripheral surface of the pipe.

The drainage pipe 15 has a smaller inner diameter in the order of a main pipe, a branch pipe, and a branch pipe. In the present embodiment, all of the pipes are made of synthetic resin. In the present embodiment, the inner diameter of the main pipe is 200 to 500 mm, the inner diameter of the branch pipe is 100 to 300 mm, and the inner diameter of the branch pipe is 3 mm.
0 to 200 mm.

As shown in FIG. 4, the outlet of the main pipe of the collection / drainage pipe 15 is connected to the water treatment apparatus 4 via a flow path switching apparatus 41.
0 and the gas pressure generator 42 are connected. The flow path is switched by the flow path switching device 41 and the gas pressure generating device 42
The aerobic gas blown from to the waste is preferably air. Oxygen gas may be used, but air is preferred because it is inexpensive. The gas pressure is not particularly limited, and is a pressure at which the aerobic gas can be discharged from the drainage port of the drainage pipe 15 toward the waste 2. The gas pressure generator 42 is configured by a blower such as a compressor or a pump. The water treatment device 40 is a device capable of performing physicochemical treatment in addition to biological treatment, and is a device for purifying leachate.

The flow path switching valve device 41 is controlled to be switched manually or by a controller 46 shown in FIG.
5 is switched to a water treatment device 40 or a gas pressure generation device 42 for connection. At the stage where the landfill of the waste 2 is completed, in the normal state, the flow path switching valve device 41
Is controlled so as to connect the drainage pipe 15 to the water treatment apparatus 40, and the leachate from the waste collected by the drainage pipe 15 is treated by the water treatment apparatus 40.

The flow switching valve device 41 allows the drainage pipe 15
And the gas pressure generator 42 are connected at a certain timing during the landfill of the waste 2 and at a predetermined timing after the completion of the landfill of the waste 2. The predetermined timing after completion of landfill of waste 2 is
This is a timing for each time interval predetermined by a timer or the like. Alternatively, as shown in FIG. 4, various sensors 45 installed in the layers 2a and 2b of the buried waste 2
May be monitored by the controller 46, and the output signal may be at a timing satisfying a predetermined condition. As the various sensors 46, gas sensors,
Examples include a temperature sensor and a moisture meter.

By monitoring the output signals from these sensors by the controller 46, it is possible to detect the degree of progress of the decomposition of the organic substance, and it is possible to qualitatively grasp the stabilization. Therefore, based on the result of monitoring by the controller 46, the flow path switching valve device 41 is driven manually or automatically, and an aerobic gas such as high-pressure air is discharged from the collection / drainage port of the collection / drainage pipe 15 to the waste 2. By blowing out the waste, the waste can be placed in an aerobic atmosphere and the waste can be efficiently stabilized. In the middle of the landfill, as shown in FIG. 4, an aerobic gas such as high-pressure air is intermittently or continuously blown out from the collection / drainage port of the collection / drainage pipe 15 toward the waste 2 so that the protective layer is formed. An aerobic gas passage 50 is formed in the waste layer 11 and the waste layer 2a, which facilitates the passage of the aerobic gas into the waste when the waste is stabilized.

As shown in FIGS. 1 and 3, soil is put on the waste 2 deposited and deposited, and
Is formed. A capping layer 20 is laid thereon. Sand is further covered on the capping layer 20 to form a protective layer 22. The thickness of the covering layer 21 is 5
The thickness is preferably about 00 to 2000 mm, and the thickness of the protective layer 22 is preferably about 500 to 2000 mm.

As shown in FIG. 3, the capping layer 20 includes a water-impervious sheet 5a and a three-dimensional net-like structure sheet 6a provided so as to sandwich the water-impervious sheet 5a from both sides. The impermeable sheet 5a is made of the same material as the impermeable sheet 5 of the impermeable and drainage layer 10, and has a similar thickness. The three-dimensional network structure sheet 6a is made of the same material as the three-dimensional network structure sheet 6 of the water-blocking / drainage layer 10, and has a similar thickness. Since the capping layer 20 has the water-blocking sheet 5a, rainwater or the like does not enter the buried waste 2 from the outside.

In the present embodiment, as shown in FIG. 3, between the lower three-dimensional net-like body sheet 6a and the impermeable sheet 5a,
The exhaust pipes 25 are mounted at predetermined intervals (even at irregular intervals). The exhaust pipe 25 is arranged in a branched shape, and is composed of a main pipe and a branch pipe. The gas (rot odor) generated from the waste 2 flows through the gap of the lower three-dimensional net structure sheet 6 in the capping layer 20 and collects in the exhaust pipe 25, and from the exhaust port of the exhaust pipe 25 to the branch pipe. And finally discharge through the main pipe. The exhaust port of the exhaust pipe 25 is formed by making a hole penetrating into the pipe on the peripheral surface of the pipe.

The exhaust pipe 25 has a smaller inner diameter in order of the main pipe and the branch pipe, and in the present embodiment, each is formed of a synthetic resin pipe. In the present embodiment, the inner diameter of the main pipe is 50 to 500 mm, and the inner diameter of the branch pipe is 30 to 500 mm.
200 mm.

As shown in FIG. 4, a forced exhaust device 30 and a liquid pressure generating device 32 are connected to the outlet of the main pipe of the exhaust pipe 25 via a flow path switching valve device 31, as shown in FIG. The liquid sent from the liquid pressure generator is preferably water.
Water may contain microorganisms that promote the spoilage of waste. The liquid pressure is not particularly limited, and is a pressure at which water can be discharged from the exhaust port of the exhaust pipe 25 toward the waste 2.

The forced evacuation device 30 is constituted by a suction pump such as a vacuum pump. Further, the liquid pressure generating device 32 is constituted by a normal pump.

The flow path switching valve device 31 is controlled to be switched manually or by a controller 46 shown in FIG.
Is switched to a forced exhaust device 30 or a liquid pressure generating device 32 for connection. At the stage where the landfill of the waste 2 is completed, in the normal state, the flow path switching valve device 31
Is controlled to connect the exhaust pipe 25 to the forced exhaust device 30, and is forcibly sucked by the forced exhaust device 30 to suck and exhaust gas from the exhaust pipe 25.

The connection between the exhaust pipe 25 and the liquid pressure generating device 32 by the flow path switching valve device 31 is performed at a predetermined timing after the completion of the landfill of the waste 2. The predetermined timing after completion of the landfill of the waste 2 is a timing at every time interval predetermined by a timer or the like. Alternatively, as shown in FIG. 4, output signals from various sensors 45 installed in the layers 2a and 2b of the buried waste 2 are monitored by the controller 46, and the output signals satisfy predetermined conditions. It may be timing.

By monitoring the output signals from these sensors by the controller 46, it is possible to detect the degree of progress of the decomposition of the organic matter, and it is possible to qualitatively grasp the stabilization. Therefore, based on the result of monitoring by the controller 46, the flow path switching valve device 31 is driven manually or automatically, and a liquid such as high-pressure water is blown out toward the waste 2 from the exhaust port of the exhaust pipe 25. Therefore, the progress of the spoilage of the waste can be promoted, and the waste can be efficiently stabilized. In the middle of landfill, Fig. 4
As shown in the figure, high-pressure water is intermittently or continuously blown out from the exhaust port of the exhaust pipe 25 toward the waste 2, so that the liquid passage 51 flows into the protective layer 21 and the waste layer 2 b.
Are formed, and it becomes easy to pass high-pressure water into the waste when stabilizing the waste.

At the timing when the switching valve device 31 is switched to blow out high-pressure water from the exhaust port of the exhaust pipe 25, the switching valve 41 is switched so that the collecting / draining pipe 15 and the water treatment device 40 are switched.
And the drainage mode is preferably set to the drainage mode. Further, at the timing of switching the switching valve 41 to blow out the high-pressure air from the drainage pipe, the switching valve device 31
, The exhaust pipe 25 and the forced exhaust device 30 are communicated with each other to set the exhaust mode.

In the waste landfill facility and the method of operating the waste landfill facility according to the present embodiment, the impermeable / drainage layer 10 and the drainage pipe 15 are arranged below the waste 2 to be landfilled. Therefore, the leachate from the waste 2 is collected through the drainage pipe 15 without permeating to the ground side, and is detoxified by the water treatment device 40 or the like.

Further, since the upper side of the waste 2 to be landfilled is covered with the capping layer 20 having the waterproof sheet 5a, rainwater and the like do not enter the waste 2 from the outside. In addition, gas generated from the waste 2 (e.g., gas with putrefactive odor) is supplied to the impermeable sheet 5 of the capping layer 20.
The gas is quickly exhausted to the outside through the exhaust pipe 25 arranged below the portion a. Then, as shown in FIG. 5, a liquid such as water is intermittently blown toward the waste 2 through the exhaust pipe 25 and the waste 2 is discharged through the drainage pipe 15.
By blowing an aerobic gas such as high-pressure air toward, the waste 2 surrounded by the water-blocking / draining layer 10 and the capping layer 20 in a substantially sealed state is placed in an aerobic atmosphere. Thereby, the biological action of the decomposable organic matter in the waste 2 can be enhanced, the corrosion of the waste 2 can be accelerated, and the stabilization of the waste 2 can be promoted.

In the construction method of the waste landfill facility according to the present embodiment, high-pressure air is intermittently or continuously blown out from the drainage port of the drainage pipe 15 during landfilling.
A passage 50 for high-pressure air is formed in the waste 2, which facilitates the passage of high-pressure air into the waste when stabilizing the waste 2.

Note that the present invention is not limited to the above-described embodiment, and can be variously modified within the scope of the present invention.

For example, FIGS. 6A to 6C and FIG.
As shown in (A) to (C), in the construction method of the landfill facility and the operation method of the landfill facility, the landfill area is divided into a plurality of sections 1a to 1e, and the above-described operation is performed for each section 1a to 1e. By performing the landfill method and the operation method according to the embodiment, it becomes possible to perform management according to the state of the waste in each of the sections 1a to 1e, and it is possible to efficiently promote the stabilization of the waste. . That is, since landfilling and management are performed for each of the sections 1a to 1e, the amount of leachate to be treated can be reduced as a whole, and load fluctuation in the leachate water treatment device 40 can be prevented. In addition, the quality of the leachate can be homogenized. Further, the sections 1a to 1e
Each time, a drainage pipe system (including the water treatment device 40), an exhaust pipe system (including the forced exhaust device 30), a gas pressure generation device 42, and a liquid pressure generation device 32 are provided and operated independently. The size of the devices 30, 32, 40, 42 can be reduced. Further, delicate stabilization control can be performed for each of the sections 1a to 1e.

Further, by performing the reclamation for each of the sections 1a to 1e, maintenance (measures for aging and breakage of the sheet) of the water-blocking / drainage layer 10 and the capping layer 20 laid in each section becomes easy. The amount of waste landfilled in each of the sections 1a to 1e is not particularly limited, but is 50,000 to 500,000 m.
^{About 3} is preferable. Further, in the examples shown in FIGS. 6 and 7, the landfill sections 1a to 1e are divided along the horizontal direction, but they may also be divided vertically. That is, FIG.
The above-described landfill method may be carried out for each section on the landfill area shown in FIG. 7C and FIG. 7C.

Furthermore, in the above-described embodiments, all the new landfill facilities are constructed or operated. However, the present invention can be used for repairing existing landfill facilities. That is, a plurality of vertical intake holes are formed at predetermined intervals by performing boring or the like on a waste layer buried in an existing landfill facility, and the waste material having the intake holes formed is formed. The upper part is covered with a capping layer composed of a three-dimensional net-like structure sheet and a water-blocking sheet, and an exhaust pipe is arranged between the three-dimensional net-like structure sheet and the water-blocking sheet. That is, the water-blocking structure and the drainage structure disposed below the waste layer use the existing facilities as they are, and use only the capping layer as the same capping layer as in the above embodiment.

According to the method for repairing a landfill facility according to such an embodiment, the impermeable structure and the drainage structure arranged below the waste layer are different from those of the above-described embodiment except for the point different from the above-described embodiment. By operating the landfill facility in the same manner as described above, the same operation and effect as in the above embodiment can be expected.

[0068]

As described above, according to the waste landfill facility, the method for repairing the existing landfill facility, the construction method and the operation method according to the present invention, it is possible to effectively prevent rainwater and the like from entering the waste. Meanwhile, gas generated from the waste can be reliably discharged, and the buried waste can be placed in an aerobic environment to promote stabilization.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view of a waste landfill facility according to one embodiment of the present invention.

FIG. 2 is a cross-sectional view of a main part of the impermeable and drainage layer shown in FIG.

FIG. 3 is a sectional view of a main part of the capping layer shown in FIG.

FIG. 4 is a schematic diagram showing equipment for stabilizing waste.

FIG. 5 is a schematic cross-sectional view for explaining stabilization of waste.

FIGS. 6A to 6C are schematic views showing a method of performing landfill for each section.

FIGS. 7A to 7C are schematic diagrams showing a method of performing landfill for each section.

[Explanation of symbols]

 2 Waste 3 Ground 5 5a Water-blocking sheet 6, 6a Solid mesh sheet 10 Water-blocking / drain sheet 15 Collecting / drainage pipe 20 Capping layer 25 Exhaust pipe 31, 41 Flow path switching valve apparatus

Claims (4)

[Claims] 1. A seepage / drainage layer laid on a ground on which waste is landfilled to perform seepage of leachate seeping out of waste and guiding the leachate along a plane direction. A drainage pipe arranged to collect and drain leachate drained along the drainage layer, and covering over the waste deposited on the seepage / drainage layer and the drainage pipe, A waste landfill facility comprising: a capping layer that prevents water from entering; and an exhaust pipe that is disposed inside or below the capping layer and that exhausts gas generated from waste below. 2. A step of forming a plurality of air holes in a waste layer buried in an existing landfill facility, and a step of forming a three-dimensional net-like structure sheet on the waste having the air holes formed therein. A method for repairing an existing waste landfill facility, comprising a step of disposing an exhaust pipe between a three-dimensional net-like structure sheet and a waterproof sheet while covering with a capping layer composed of a water sheet. And a step of laying a seepage and drainage layer for guiding leachate along a plane direction on the ground on which the waste is landfilled and guiding the leachate along a plane. Arranging a drainage pipe so as to collect and drain leachate drained along the water / drainage layer; and reversely intermittently or continuously blowing aerobic gas from the drainage port of the drainage pipe. While depositing, the step of depositing the waste on the impermeable / drainage layer and the drainage pipe, and the exhaust of gas generated from the waste located below the deposited waste can be performed. Arrange the exhaust pipe,
Covering the exhaust pipe with a water-shielding capping layer together with the waste. 4. The method for operating a waste landfill facility according to claim 1, wherein an aerobic gas is blown out from a drainage port of the drainage pipe toward the landfilled wastewater to discharge the wastewater. A method of operating a waste landfill facility, comprising the steps of: exhausting air from an exhaust pipe through an exhaust pipe; and blowing out liquid from an exhaust port of the exhaust pipe toward waste, and draining the waste water from the collecting and draining pipe.