JPH10211476A - Waste landfilling treatment facility - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent leakage of harmful components due to penetration of rain water into wastes during landfilling process and at the same time easily carry out leachate collection and gas vent after completion of landfilling. SOLUTION: The whole area of a reclaimed land is covered with a tent type roofing apparatus and discarding work is carried out in the area being covered with the roofing apparatus. A main pole 6 to support a tent 8 is formed into a pipe-like shape and water is pooled in the bottom of the main pole 6 and discharged by a pump 35. Further, a gas collecting outlet 24 is formed in the main pole 6 and a gas generated in a waste layer 14 is collected in the main pole 6 and sucked by a fan and sent to a boiler.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a landfill facility for final treatment of industrial waste and incineration ash.

[0002]

2. Description of the Related Art In general, waste landfills are created by cutting up mountain valleys, and waste and cover soil are alternately dumped. In this case, the harmful components contained in the waste leaked out of the landfill by rainwater, and the pollutants that pollute river water and groundwater or the surrounding soil and organisms occurred frequently in the past. It is mandatory to take measures to prevent rainwater from leaking out of the landfill.

[0003] The most popular method for preventing this leakage of harmful substances is to cover the inner surface of the landfill with a waterproof sheet such as a rubber sheet or a synthetic resin sheet so that even if rainwater permeates the waste. Measures have been taken to prevent leakage from the landfill and to provide gutters around the landfill to prevent rainwater from flowing into the landfill. However, in order to prevent contaminated water from spreading around the landfill, a lower drainage channel that collects water leakage from the lower impermeable sheet is also buried.

[0004] Japanese Patent Publication No. 1-54110 discloses an upper water-impervious sheet (final water-impervious sheet) in the uppermost finishing layer in order to prevent rainwater from penetrating into the waste layer after landfill treatment. Sheet). Furthermore, special fairness
In Japanese Patent Publication No. 3-35996, it is described that a vent pipe for removing gas generated in a waste layer is buried.

[0005]

By the way, the dumping of waste into landfills takes place over a long period of time, during which many rainfalls (snow, hail, hail, depending on the area and season) naturally occur. is there. In particular, landfills of this type are often built in mountainous areas, which tend to increase the amount of rainfall.

[0006] In the conventional treatment facility and treatment method including the inventions of the above publications, landfill is performed in open-air, so that rain and snow falling in the landfill during the landfill treatment process are not changed to the waste layer. And penetrates the soil cover layer. For this reason, contaminated water is not only easily leaked out of the landfill, but also the waste is liable to react with water or ferment to generate gas such as methane gas or generate heat. there were.

[0007] Also, since rainwater that has permeated into the waste layer during the dumping process and after the dumping is collected at the location of the lower impermeable sheet, a large water pressure acts on the lower impermeable sheet and the lower impermeable sheet deteriorates. There was also a problem that the durability of the lower water impermeable sheet was low. An object of the present invention is to solve these problems.

[0008]

According to the present invention, the inner surface of a landfill formed in a depression is covered with a lower impermeable sheet, and waste and soil are alternately stacked on the landfill, and the uppermost layer is a finishing layer. In the landfill treatment facility that was completed, `` A proper number of pipe-shaped main pillars were erected on the bottom of the landfill, and these main pillars supported roofing materials such as awnings, so that at least the entire landfill A roof device capable of covering the ground, and further, a water collecting port for allowing water to flow from the waste layer or the soil layer into the main column, and a gas generated in the waste layer to the main column. Forming at least one of a gas collection port to allow the water to flow into and allowing water and / or gas to be removed via the main support "
Was configured.

Means for removing water from the main support include, for example, a submersible pump or a suction pipe with a strainer placed in the main support and sucked up. It may be pumped up depending on the situation. Also, the gas may be naturally released,
As described in the second aspect, it is desirable that the fuel is sucked by a fan or the like and supplied to the fuel of the boiler.

In order to improve the water-blocking effect, it is desirable to provide an upper water-blocking sheet on the finishing layer and to provide an outer waterway around the landfill as described in claim 2. In addition, as a safety measure in the event that the upper and lower impermeable sheets are torn, it is desirable to provide a lower drainage channel on the bottom of the landfill. The lower drainage channel is desirably sized (cross-sectional area) to allow a person to enter and inspect the inside.

The roof device is preferably of an assembling type.
From the viewpoint of ease of removal and economy, it is preferable to form a tent using a tent (sheet) as a roofing material. Generally, roof equipment will be removed after landfill,
A roof device may be provided depending on the form of use of the landfill site. Further, in order to prevent the soil of the finishing layer from flowing out due to heavy rain after the completion of the landfill treatment, it is desirable to provide a drainage device in the finishing layer.

The material of the water-blocking sheet is not limited, as long as it can maintain the water-blocking function for many months. In addition, roof materials such as awnings are not limited to being supported only by the main pillars. Needless to say, side pillars may be erected around the landfill, and these side pillars and the main pillars may be used in combination. .

[0013]

According to the present invention, during the landfill process, since the landfill is covered with a roof device, even if there is rainfall or snowfall during the landfill process, water will remain in the waste layer. It does not penetrate and protects workers from rain, snow and hot weather, thus improving the working environment.

[0014] On the other hand, even if rainwater permeates into the waste layer and the soil cover layer after the completion of the landfill treatment, the rainwater permeated into the waste layer is discharged by using the main pillar for draining. be able to. The main support can also be used for removing gas generated from the waste layer. As described above, the present invention uses a main support for installing a roof device for covering a landfill, and drains or degasses from a waste layer, or both. This has the effect of preventing permeation, improving the working environment, and properly performing drainage or degassing or both without increasing the size of the equipment.

In particular, according to the structure of claim 2, The upper water-impervious sheet embedded in the finishing layer can block or significantly suppress the penetration of rainwater into the waste layer, so that the water-shielding function can be further improved. When the lower impermeable sheet is torn, it is possible to visually check where water leaks by entering the lower drainage channel, making it easier to repair damaged parts of the lower impermeable sheet than before. ,. Since the gas generated in the waste layer can be used as fuel for a boiler or the like, there is an advantage that energy can be effectively used.

[0016]

Next, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic perspective view schematically showing the entire waste landfill facility, and FIG. 2 is a plan view of the landfill facility. The landfill facility is built in a valley in a mountainous area. The landfill 2 is formed as a depression by shaving the valley and damming with a bank 1. A tent-shaped roof covering the entire landfill 2 during the landfill process. Device 3.

A lower drainage channel (underdrain) 4 is provided at the bottom of the landfill 2.
Is buried, and the water leaked to this lower drainage channel 4
The water is collected in a water collecting pit 5 installed outside the dam 1. On the other hand, the roof device 3 has a structure in which an awning 8 is stretched using a number of columns 6, 7 which are pulled and fixed by wires. As shown in FIG. 2, around the landfill 2, an outer waterway (gutter) 9 for collecting rainwater is provided. The bank 10 inside the outer peripheral waterway 9 is inclined toward the outer peripheral waterway 9.

Next, the details of the treatment facility and the landfill process are described below.
This will be described with reference to FIGS. FIG. 3 is a cross-sectional view of FIG.
FIG. 4 is an enlarged view of a main part, and FIG. 5 is a VV of FIG.
FIG. 6 is a view showing the installation of the main support 6, and FIG.
FIG. 8 is a sectional view taken along line VII-VII, and FIG. 8 is a partial sectional view after landfilling is completed. As shown in FIG. 3, on the inner surface of landfill 2,
A lower impermeable sheet 11 made of an appropriate material such as rubber or synthetic resin is laid. The lower water-impervious sheet 11 is laid via a low-permeability clay layer 12, on which the soil covering layer 13 and the waste 14 are alternately dumped while being equalized, and the uppermost surface is a finishing layer 15. . When the foundation ground 16 is made of clay, the lower impermeable sheet 11 may be directly laid.

As shown in FIG. 5, the edge of the lower impermeable sheet 11 extends so as to cover the upper end of the bank 1. Further, as shown in FIG. 7, the rim of the lower impermeable sheet 11 extends to the outer peripheral waterway 9. This is the inner surface of landfill 2 and the lower impermeable sheet 11
This is to prevent rainwater from entering the boundary between the two. As shown in FIG. 2, the lower drainage channel 4 buried in the bottom of the landfill 2 has one main drainage channel 4 a opened to the water collecting pit 5.
And a number of branch drainage channels 4b connected to the main drainage channel 4a. As shown in FIG. 4, the lower drainage channel 4 is closed by a cover plate 4c having a large number of holes, and the cover plate 4c is made of a suitable size stone (ballast) and a protective layer such as sand. And a permeable layer 18 composed of This is for protecting the lower impermeable sheet 11 without impairing the function of passing water through the drainage channel 4. The water-permeable layer 18 may be made of a porous material such as a nonwoven fabric or a felt.

As the lid plate 4c of the lower drainage channel 4, various types such as a perforated plate made of concrete, a porous metal plate such as a punched metal or lath plate, or a perforated plate made of casting can be used. A perforated plate made of concrete is preferable from the viewpoint of corrosion resistance, strength and economy. The main drainage channel 4a is slightly inclined toward the water collection pit 5. Further, each branch drainage channel 4b is gently inclined toward the main drainage channel 4a. It is desirable that the bottom surface of the landfill 2 and the clay layer 12 are also gently inclined toward the lower drainage channel 4.

The main drainage channel 4a is set to have a cross-sectional area that allows at least a general adult to bend down and pass (preferably large enough to be able to stand and walk). On the other hand, the branch drainage channel 4b does not necessarily need to be set to have a cross-sectional area that can pass through an adult, and may be of a size that allows the internal condition to be checked by illuminating the main drainage channel 4a with a flashlight. If the treatment facility is large, it is desirable that the branch drainage channel 4b is also set to a cross-sectional area large enough for humans to pass through).

Next, the structure of the roof device 3 will be described. FIG.
As shown schematically, a plurality of main columns 6 are erected at appropriate intervals on the foundation ground 16 at the bottom of the landfill 2, and a number of side columns 7 are also erected on the bank 10 of the landfill 2. By connecting the columns 6 and 7 to each other with a spacing wire 19 and pulling each side column 7 toward the foundation ground 16 with a pulling wire 20, the columns 6 and 7 fall down. Holds impossible. An awning (sheet) 8 is stretched so as to cover the entire landfill 2 by using the large number of pillars 6 and 7.

The tent 8 is fixed to the columns 6, 7 and the wires 19, 20 at appropriate positions. In addition, tent 8 is a rope
It is pulled by 21 toward the foundation ground 16. The tent 8 may have a certain degree of impermeability and strength, such as a hood cloth or a vinyl sheet. Although not shown in the drawing, a pulling wire 20 for the side support 7 and a tension line 21 for the awning 8
Is fixed to an anchor (not shown) buried or driven into the ground. As a means for fixing the columns 6, 7, a wire, a bar, a chain, or the like may be used instead of the wires 19, 20. Furthermore, a roof frame may be formed by connecting the upper ends of the pillars 6 and 7 with a long member such as a pipe or a lightweight member, and a ceiling material such as an awning 8 or a corrugated sheet may be provided on the roof frame.

As shown in FIG. 6, the main support 6 is formed in a pipe shape such as a cylindrical shape, and is buried in a foundation 22 buried in the bottom of the landfill 2. A water collecting port 23 opens laterally at a portion near the lower end of the main support 6. The water collecting port 23 may be formed by simply making a hole in the main support 6, or may be connected to a horizontally long water collecting pipe (not shown) having a large number of holes. Further, a gas collection port 24 is opened in the main support 6. The gas collecting port 24 is connected to a gas collecting branch pipe 24a that extends horizontally. The branch pipe 24a for gas collection has many holes. The gas collecting port 24 and the gas collecting branch pipe 24a may be provided in multiple stages for each waste layer 14. The water collecting port 23 may be formed in multiple stages.

The main column 6 is made of a corrosion-resistant and high-strength material such as a cast steel pipe, a concrete pipe, or a synthetic resin pipe. The main support 6 is composed of a buried portion 6a having a height slightly protruding from the finishing layer 15 and a replenishing portion 6b removably fitted into the buried portion 6a from above. The awning 8 is supported by a refill 6b. After completion of the landfill, the refill portion 6b is removed, and the upper end of the embedded portion 6a is closed with the cap 25. It is not necessary that the extension portion 6b is made of a pipe, but may be made of a bar, a mold, or a bamboo.

As shown in FIGS. 7 and 8, a number of vertical pipes 26 for collecting gas are provided in the landfill 2 at appropriate intervals, and each vertical pipe 26 for collecting gas and the main column 6 are connected by a horizontal pipe 27. It is connected. The gas that has flowed into each main column 6 and the vertical pipe 26 for gas collection is sucked by the fan 29 through the collecting pipe 28 and supplied to the fuel of the boiler 30. It is not always necessary to provide the gas collection vertical pipe 26, and a large number of gas collection branch pipes 24
May simply be connected.

Since the main support 6 penetrates through the lower water-impervious sheet 11, as shown in FIG. 6, the lower water-impervious sheet 11 is fixed to the main support 6 by a suitable fixing means such as a band 31 or the like. To prevent water leakage from When the gas collection vertical pipe 26 is made to penetrate the lower water-impervious sheet 11, a leak-preventing means such as the band 31 is taken similarly to the lower water-impervious sheet 11. When the dumping of the waste 14 into the landfill 2 is completed, an upper water-impervious sheet 32 is laid on the uppermost soil covering layer 13, and the soil is laid on the upper waterproofing sheet 32, and a finishing layer 15 of an appropriate thickness (for example, 2 to 3 m) is laid thereon. To form As shown in FIGS. 5 and 7, the upper drainage channel 33 is buried in the finishing layer 15. The upper drainage channel 33 is composed of a main channel 33a and a branch channel 33b, and the main channel 33a is open to the outer surface of the bank 1.

Since the interior of the landfill 2 gradually sinks for many years, the upper water-impervious sheet 32 is provided with sufficient clearance in advance so that tension does not act even if it sinks. Also, in the upper drainage channel 33, the main channel 33a is inclined toward the dam 1 in a state where it has completely settled, and the branch channel 33b is connected to the main channel 33b.
Is set in advance so as to be inclined toward. Main waterway 33a
May be provided in plurality.

As shown in FIGS. 5 and 7, the upper impermeable sheet 32 extends so as to cover the upper end of the bank 1 and the bank 10. In the above configuration, the roof device 3 covering the landfill 2
The rainwater and snowmelt do not penetrate into the waste layer 14 even if there is rainfall or snowfall during the dumping of the waste 14 into the landfill 2 It is possible to remarkably prevent the harmful components in the substance 14 from flowing out and generating gas such as methane. Also, even if the roof device 3 is removed after the landfill process is completed, the waste layer 14 is blocked by the upper water-impervious sheet 32. Water does not penetrate the waste layer 14.

Further, even if heavy rain falls, the excess water contained in the finishing layer 15 is removed from the landfill 2 from the upper drainage channel 33, so that the finishing layer 15 flows out and the upper waterproof sheet 32 Can be prevented or significantly suppressed. Furthermore, if the upper waterproof sheet 32 and the lower waterproof sheet 32
Even if the rainwater 11 is broken for some reason and the rainwater flows out from the lower impermeable sheet 11, the water that has flowed out is collected in the water collection pit 5 through the lower drainage channel 4 and processed by the pump 34, as shown in FIG. It is sent to the facility and detoxified. Therefore, water containing harmful components does not flow out and pollute the surrounding environment.

Further, since a person can enter at least the main waterway 4a of the lower drainage channel 4, it is possible to easily check and inspect from which part the water leaks, and accordingly, the lower water shield Repair work of the seat 11 is easier than before. Detoxified water may be released to nearby rivers, but if the water is circulated in the treatment facility, such as for watering plants planted in the finishing layer 15, resources should be used effectively And the safety can be further improved.

Even if the upper water-blocking sheet 32 is broken and rainwater permeates into the waste layer 14, as shown in FIG. 6, the rainwater permeated into the waste layer 14 (or the The water that oozes from the water 13 accumulates on the main support 6 and can be sucked up by the pump 35 for detoxification treatment. Therefore, the durability of the lower impermeable sheet 11 can be improved and the impermeable function can be further improved. . In addition, since the drainage and degassing can be performed by using the column 6 for the roof device 3, the drainage and degassing can be accurately performed without complicating the equipment.

Further, the boiler 30 using gas generated from the waste layer 14 as a fuel is used as a heat source to heat the water that has been sucked up from the water collecting pit 5 and the main column 6 and to be treated or collected from the outer waterway 9. Heating the rainwater, or driving the pumps 34 and 35 using the boiler 30 as a power source,
Since the gas generated in the waste layer 14 is used as an energy source required for water circulation and the like in the treatment facility, water and energy can be effectively used.

That is, by circulating water and energy in the treatment facility as a closed system, it is possible to effectively use resources and improve safety. When facilities such as a greenhouse are provided in the treatment facility, it is needless to say that gas from the waste 14 may be used as an energy source thereof. Since gas is also generated during the landfilling step of the waste 14, the gas may be extracted through the main support 6 and the like during the landfilling step, and the boiler 30 may be boiled using the gas as fuel. In this case, if there is snow, the hot water heated by the boiler 30 is sprayed on the roof device 3 to melt the snow, or
Hot water or steam may be passed through a pipe provided in the roof device 3 to melt snow. Further, it may be used for heating a work office.

In the above embodiment, the water accumulated in the main support 6 is discharged by the pump 35. However, as shown by a dashed line in FIG. The pit 5 may be connected to the pit 5 by a pipe 36, and the water accumulated in the main support 6 may be collected in the water collecting pit 5 for processing. Alternatively, as shown by a two-dot chain line in FIG. 6 (A), water collected in the main support 6 may be caused to flow to the lower drainage channel 4 and collected in the water collecting pit 5. In this case, the suction pump 35 is not required.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view schematically showing the entire landfill treatment facility.

FIG. 2 is a schematic plan view of a landfill processing facility.

FIG. 3 is a schematic sectional view taken along line III-III of FIG. 2;

FIG. 4 is an enlarged view of a main part showing a buried state of a lower drainage channel.

FIG. 5 is a sectional view taken along line VV of FIG. 2;

FIG. 6A is a diagram showing an installed state of a main support, and FIG. 6B is a diagram showing a state where an awning is supported by the main support.

FIG. 7 is a sectional view taken along the line VII-VII of FIG. 2;

FIG. 8 is a partial cross-sectional view after landfill is completed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Dam 2 Landfill 3 Roofing device 4 Lower drainage channel 6 Main column 8 Tent 9 Perimeter waterway 11 Lower water-blocking sheet 13 Covering soil 14 Waste 15 Finishing layer 23 Water collecting port 24 Gas collection port 32 Upper water-blocking sheet 33 Upper drainage channel 34 , 35 pump

Claims (2)

[Claims] 1. A landfill treatment facility in which the inner surface of a landfill formed in a depression is covered with a lower impermeable sheet, and waste and cover soil are alternately stacked in the landfill so that the uppermost layer is a finishing layer. It is possible to cover the entire landfill at least during the landfilling process by appropriately arranging pipe-shaped main pillars on the bottom surface of the landfill and supporting roof materials such as awnings with these main pillars. A roof device is installed, and a water inlet for allowing water to flow from the waste layer or the soil cover layer into the main column is provided on the main column, and a gas generated in the waste layer flows into the main column. A wastewater treatment facility, characterized by forming at least one of a gas collection port that allows water and / or gas to be removed through a main support. 2. The landfill according to claim 1, wherein a lower drainage channel is provided at the bottom of the landfill for collecting water leakage and collecting the leakage outside the landfill when the lower impermeable sheet is broken. In the meantime, while providing an outer waterway for preventing rainwater from flowing into the landfill, the finishing layer embeds an upper water-impervious sheet to prevent rainwater from penetrating the waste layer,
A waste treatment facility comprising a pipe connected to a main support for sucking gas flowing into the main support from a waste layer and supplying the gas to a boiler or the like.