JPH0435780A - Treatment of exuded water in waste disposal place - Google Patents

Abstract

PURPOSE:To reduce burden for a disposal plant by dividing the surface of a disposal place into both a ground leveling work zone and a ground leveling finish zone and covering the surface of this ground leveling finish zone with a temporary pool and also connecting the inside of the pool to a connection pipe and draining the water in the pool into the peripheral ground. CONSTITUTION:The surface of a disposal place 1 is divided into both a ground leveling work zone I and a ground leveling finish zone II. A temporary pool 10 has a area sufficient to cover the whole surface of the ground leveling finish zone II and further is connected to the connection pipes 9 provided in the vicinity of the temporary pool 10 via a pump P. When it rains in the disposal place 1, rainwater is stored in the temporary pool 10 which occupies at least half of the surface area thereof. The stored rainwater free from harmful substance is discharged into ground E through the connection pipes 9 by operating the pump P and penetrated thereinto. After all, rainwater pours on only the surface of the ground leveling work zone I in the surface area of the disposal place 1. Water penetrated from this part only infiltrates into the bottom part of the disposal place 1. Thereby the burden for a disposal plant 7 can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a method for treating exudate in an open-air waste disposal site, particularly for reducing the amount of exudate discharged from rainwater or the like.

(Conventional technology) At open-air waste disposal sites, the ground is excavated, garbage is dumped inside, and soil is poured over and leveled, and layers are layered alternately.

In this type of open-air waste disposal site, if the ground is simply excavated, water containing toxic components such as acetic acid and heavy metals that seep in from rainwater or water-containing kitchen waste will be removed from the surrounding area. It seeps into the ground and contaminates it.

Therefore, conventionally, a waterproof sheet was laid inside the disposal site to partition the ground side and the inside of the disposal site in a liquid-tight manner, and a collection and drainage channel was placed at the inner bottom of the waterproof sheet, so that the waste piled up inside the disposal site could be separated. The exudate that passes between objects is collected in this collection and drainage channel, and the collected exudate is discharged to the treatment facility, and after removing harmful substances such as heavy metal ions from the exudate and making it harmless,
It is discharged into rivers, etc.

(Problem to be solved by the invention) However, especially when it rains heavily or during the rainy season, a large amount of rainwater permeates inside the garbage, resulting in the amount of seepage water exceeding the originally planned appropriate treatment capacity. In this case, sufficient processing may not be performed. Furthermore, even if the water has been rendered harmless after treatment, it has become a target for residents to protest if the water is released.

This invention solves the above-mentioned problems, and is capable of reducing the amount of water seeping into this type of open-air waste disposal site, thereby preventing excessive burden on treatment facilities. The purpose is to provide a processing method for

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a waterproof sheet that watertightly partitions between the interior of an open-air disposal site obtained by excavating the ground and the surrounding ground; In a waste disposal site equipped with a collection and drainage channel arranged at the inner bottom of a waterproof sheet, a movable temporary pool is laid on the surface of the disposal site, and a plurality of movable temporary pools are connected to the ground side through the waterproof sheet. A connecting pipe is provided, the surface of the disposal site is divided alternately into a garbage leveling work area and a leveling finished area, the surface of the leveling finished area is covered by the temporary pool, and the connecting pipe is connected to the inside of the pool. The water in the pool is then drained into the surrounding ground.

(Function) According to the above configuration, rainwater does not seep into the area covered by the temporary pool, and the amount of seepage water can be reduced according to the area of the pool.

(Example) Hereinafter, an example of the present invention will be described in detail using the drawings.

In FIG. 1, a waste disposal site 1 according to the present invention is
It was obtained by open-cutting flat ground into an almost inverted trapezoidal shape, and there is a sand mat layer 2 between the inside and the surrounding ground E.
A waterproof sheet 3 is laid through the ground, and the periphery of this waterproof sheet 3 is fixed on the ground surface by appropriate fixing means.

At the bottom of the waste disposal site 1, a collection and drainage channel 4 filled with gravel is buried inside the ground E, and at the periphery of the disposal site 1, rainwater or groundwater that has seeped into the inside of the ground E is drained through this channel. Drainage of the ground E is ensured by collecting water in the collection and drainage channel 4 and discharging it into a river or the like through this collection and drainage channel 4.

Also, inside the waterproof sheet 3, the disposal site 1
A plurality of collection and drainage channels 5 are arranged at the inner bottom of the disposal site 1, and exudate water that passes between the waste 6 accumulated inside the disposal site 1 and accumulates on the bottom side is collected through the water intake of the collection and drainage channels 5. The water is then sent to a treatment facility 7 provided on the downstream side of the water collection and drainage channel 5.

This treatment facility 7 removes harmful components such as heavy metals contained in the exudate water. After this treatment, the leachate is sent to the incinerator 8, where the organic components contained therein are incinerated and
The steam obtained is used for heating and other heat sources in welfare facilities.

A plurality of connecting pipes 9 are provided in the waterproof sheet 3 in a stepped manner, penetrating the inside and outside of the waterproof sheet 3.

Furthermore, a flexible temporary pool 10 made of vinyl or the like is movably laid on a part of the surface of the disposal site 1 covered with waste 6.

Each of the connecting pipes 9 is for discharging rainwater accumulated inside the temporary pool 10 into the surrounding ground E,
Locations where waste 6 has already accumulated are covered by lids 12.

The surface of the disposal site 1 is divided into a land preparation work area I and a land preparation completion area ■
It is divided into two parts.

The temporary pool 10 has an area that covers the entire surface of the land leveling finished area (2), and is connected to a connecting pipe 9 near the temporary pool 10 via a pump P or the like.

In addition, waste 6 is currently being dumped in the land preparation work area I,
This is the area where the ground is leveled by the bulldozer 11, and then soil is spread and leveled on top of it, and plans are being made to alternate between the two areas once the layer gets thick enough.

In the above configuration, when rain falls on the disposal site 1, it collects in the temporary pool 10, which occupies more than half of the surface area.

The collected rainwater that does not contain harmful substances is discharged into the ground E through the connecting pipe 9 by the operation of the pump P, and permeates into the ground.

In other words, rainwater is collected from the land preparation area I out of the surface area of the disposal site 1.
The water that percolates from this area permeates into the bottom of the disposal site 1.

This exudate water is sent to the treatment facility 7 side through the collection and drainage channel 4, where it is detoxified by removing harmful substances such as heavy metal ions, and then incinerated in an incinerator 8.

In addition, in the case of heavy rain or long rain, conventionally,
The volume of bone exudate needs to be treated according to the surface area of the disposal site 1, which often exceeds the appropriate treatment capacity of the treatment facility, resulting in a situation where it cannot be completely treated. If the area is covered, the volume of exudate water will be reduced to 1/4 of the conventional volume, and overflow of the treatment capacity can be prevented.

Then, dumping of waste 6 and spreading of earth and sand.

Due to land clearing work, a certain amount of waste in the land clearing work area I6
When the layer thickness increases, the pump P of the temporary boule 10 is removed from the connecting pipe 9, the connecting pipe Q is covered with the lid 12, and the temporary boule 10 is moved, and the previous sorting work area I is changed to the present sorting. By laying it on the surface of the work completion area (2) and connecting the pump P to the connection layer 9 in the vicinity, it is possible to continue the dumping operation with the garbage on the surface of the disposal site 1, as in the previous case.

In addition, when moving the temporary boule 10, since it is in the form of a sheet, it can be rolled or folded and moved easily.

In addition, if the surface area of disposal site 1 is large, temporary boule 1
0 can be divided into multiple parts.

(Effects of the Invention) As described above in detail through the embodiments, the method for treating leachate at a waste disposal site according to the present invention prevents rainwater from seeping into the area covered by the temporary boule.
The amount of seepage water can be reduced depending on the ratio of the pool area to the surface area of the disposal site.

Therefore, according to the present invention, an excessive burden on the treatment facility is prevented, it can be operated in a constant state regardless of the amount of rainfall, and there is no need to discharge treated water due to overcapacity. , the obtained steam can be effectively used as a heat source.

[Brief explanation of drawings]

FIG. 1 is an explanatory cross-sectional view of a waste disposal site according to the method of this invention. 1... Waste disposal site 3... Waterproof sheet 5... Collection and drainage channel 6... Waste 7... Treatment facility 8... Incinerator 9... Connecting pipe 10... Temporary construction boule

Claims (1)

[Claims of Claims] A waterproof sheet that watertightly partitions the interior of an open-air disposal site obtained by excavating the ground from the surrounding ground, and a collection and drainage channel arranged at the inner bottom of the waterproof sheet. In a waste disposal site, a movable temporary pool is laid on the surface of the disposal site, and a plurality of connecting pipes are provided that penetrate the waterproof sheet and communicate with the ground side, and the surface of the disposal site is leveled for garbage. It is divided alternately into a work area and a land preparation completion area, and the surface of the land preparation completion area is covered with the temporary pool, and the connection pipe and the inside of the temporary pool are connected, and the water in the temporary pool is passed through the connection pipe to the surrounding area. A method for treating leachate at a waste disposal site, which is characterized by draining water into the ground.