JP4299700B2 - Final earth covering method for waste final disposal site - Google Patents

Final earth covering method for waste final disposal site Download PDF

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JP4299700B2
JP4299700B2 JP2004066003A JP2004066003A JP4299700B2 JP 4299700 B2 JP4299700 B2 JP 4299700B2 JP 2004066003 A JP2004066003 A JP 2004066003A JP 2004066003 A JP2004066003 A JP 2004066003A JP 4299700 B2 JP4299700 B2 JP 4299700B2
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waste
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disposal site
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克彦 林
祥介 中家
隆行 島岡
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Maeda Corp
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Description

本発明は、廃棄物最終処分場の埋立地における最終覆土工法に関する。   The present invention relates to a final earth covering method in a landfill of a waste final disposal site.

通常、廃棄物最終処分場は廃棄物の埋立てが完了すると、その表面を覆土等により覆って廃棄物が露出しないようにしており、これを最終覆土という。一般的に用いられている最終覆土の方法として、土砂等の土質材料による覆土工法と、遮水シートやアスファルト等の遮水材料によるキャッピング工法がある。   Usually, when the landfill of the waste is completed, the waste final disposal site covers the surface with a soil covering or the like so that the waste is not exposed, and this is called the final soil covering. As the final soil covering method generally used, there are a soil covering method using a soil material such as earth and sand and a capping method using a water shielding material such as a water shielding sheet or asphalt.

通気性・透水性のない遮水材料によるキャッピング工法は、降雨時の雨水が廃棄物中に浸透しないで全て表面水として排水される。したがって、廃棄物中の保有水以外は有害な浸出水の発生がないことから、浸出水を放流するための水処理にかかる費用を低減することができる。   In the capping method using a water-impervious material that does not have air permeability and water permeability, all rainwater during rainfall does not penetrate into the waste and is drained as surface water. Therefore, since there is no generation of harmful leachate other than the retained water in the waste, the cost for water treatment for discharging the leachate can be reduced.

一方で、埋め立てられた廃棄物は、雨水等の浸透や空気の作用により安定化が促進されることが知られている。これは廃棄物層内に空気が入ることで層内の微生物が活性化され、廃棄物中の有機物の分解が進行するためである。さらに、浸透した雨水には、空気(酸素)が溶存しており、廃棄物層内を好気的な条件に保つ作用と、分解が進む廃棄物や有害物を洗い出す効果があり、埋立地の安定化の促進に寄与している。   On the other hand, it is known that stabilization of landfilled waste is promoted by permeation of rainwater or the like and the action of air. This is because, when air enters the waste layer, microorganisms in the layer are activated, and decomposition of organic matter in the waste proceeds. In addition, the infiltrated rainwater has dissolved air (oxygen), which has the effect of keeping the waste layer in aerobic conditions and washing out waste and harmful substances that are being decomposed. Contributes to the promotion of stabilization.

しかし、通気性・透水性のない遮水材料によるキャッピング工法では、廃棄物中に空気や水分を供給できないことから、上述した安定化の促進が期待できない。したがって、廃棄物最終処分場の廃止までの期間が極めて長くなり、長期間にわたる維持・管理が必要となる。また、空気や水分が供給されない廃棄物層内は嫌気的条件となり、有機性の廃棄物に起因するメタンガス、一酸化炭素、二酸化炭素、アンモニア等のガスが発生するため、種々の問題が指摘されている。   However, in the capping method using a water-impervious material having no air permeability and water permeability, air and moisture cannot be supplied into the waste. Therefore, the period until the final disposal site for waste is abolished becomes extremely long, and maintenance and management over a long period of time are required. In addition, in the waste layer where air and moisture are not supplied, anaerobic conditions are generated, and gases such as methane gas, carbon monoxide, carbon dioxide, and ammonia are generated due to organic waste, and various problems are pointed out. ing.

他方、土砂等の土質材料による覆土工法に関しては、通常、通気性・透水性が保持されるため、廃棄物の安定化を促進し、有害物質等の洗い出しに必要な空気や水分は供給される。空気や水分が廃棄物の分解・安定化に対して適切な量供給された場合、閉鎖された最終処分場内の廃棄物が安定化するまでの期間、すなわち維持・管理が不要になるまでの期間を短縮することができるという特長がある。   On the other hand, with respect to soil covering methods using soil materials such as earth and sand, since air permeability and water permeability are usually maintained, stabilization of waste is promoted and air and moisture necessary for washing out harmful substances are supplied. . When air and moisture are supplied in an appropriate amount for the decomposition and stabilization of waste, the period until the waste in the closed final disposal site is stabilized, that is, the period until maintenance and management are no longer necessary There is a feature that can be shortened.

一般に、国内での年間平均降水量は、廃棄物の分解・安定化に対しては過剰とされており、約5%程度が適量といわれている。このため、土砂等の土質材料による覆土工法では、表面に勾配をつけたり側溝を設ける等して、表流水を排除する構造としている。
覆土等のまた、表層を透水性を有する部分と遮水性又は難透水性を有する部分とが混在するように形成するとともに、遮水性又は難透水性を有する部分に、この部分に降った雨水を地表水として埋立地外へ排水する排水施設を形成する工法もある(例えば特許文献1参照)。
特開2001−269639号公報
In general, the annual average precipitation in Japan is considered excessive for the decomposition and stabilization of waste, and about 5% is said to be an appropriate amount. For this reason, in the earth covering method using soil materials such as earth and sand, the surface water is excluded by providing a gradient to the surface or providing a side groove.
In addition, the surface layer such as cover soil is formed so that a part having water permeability and a part having water impermeability or poor water permeability coexist, and rainwater that has fallen on this part is applied to the part having water impermeability or poor water permeability. There is also a construction method for forming a drainage facility that drains water outside the landfill as surface water (see, for example, Patent Document 1).
JP 2001-269639 A

しかしながら、集中豪雨などの場合には廃棄物層内に大量の浸透水が入り込むため、発生する浸出水の量に対応可能な規模の水処理設備が必要となる。このため、処分場閉鎖後も廃止に至るまで水処理設備及びその維持・管理に多大な費用を要するという問題がある。また、クローズド型処分場など、埋立期間中は屋根等により被覆されている最終処分場においては、降雨による影響がないため、軽微な水処理設備を採用していることが多い。このようなケースでは、閉鎖後被覆設備を撤去・移設する場合、土砂等の土質材料による覆土工法を採用することが困難となる。   However, in the case of torrential rain, etc., a large amount of permeated water enters the waste layer, so a water treatment facility having a scale that can cope with the amount of leachate generated is required. For this reason, even after the disposal site is closed, there is a problem that it requires a large amount of cost for water treatment equipment and its maintenance and management until it is abolished. Also, in final disposal sites such as closed-type disposal sites that are covered with a roof during the reclamation period, light water treatment facilities are often adopted because they are not affected by rainfall. In such a case, when removing and moving the covering equipment after closing, it becomes difficult to adopt a soil covering method using a soil material such as earth and sand.

さらに、降雨の変動に影響される断続的な水分の供給は、廃棄物層内に水みちを形成することが知られている。水みちが形成されると、廃棄物層内に浸透した水分が一定の箇所のみ流れるようになるため、洗い出しの効果が部分的になるという弊害がある。   Furthermore, it is known that intermittent water supply, affected by rainfall fluctuations, forms a water channel in the waste layer. When the water path is formed, the moisture that has permeated into the waste layer flows only at a certain location, so that the effect of washing out becomes partial.

本発明の課題は、廃棄物最終処分場において、従来の覆土工法やキャッピング工法の問題点を考慮し、浸出水の処理にかかる費用を低減しつつ、廃棄物の安定化を促進できる最終覆土工法を提供することである。   The problem of the present invention is that the final earth covering method that can promote the stabilization of the waste while reducing the cost of the leachate treatment in consideration of the problems of the conventional earth covering method and the capping method in the waste final disposal site Is to provide.

以上の課題を解決するため、本発明は、例えば図1及び図2に示すように、埋立地に埋め立てられた廃棄物層3を覆う最終覆土層に、雨水を一時的に貯留可能な凹部51を上面に形成し、かつ水を浸透可能とする浸透制御層5を設けて、廃棄物層3に浸透する水分量をコントロールできるようにしたことを特徴とする。
即ち、本発明は、前記浸透制御層を、土質材料により形成すると共に、その浸透制御層の上面に前記多数の凹部を有する形状となるように土質材料を整形し、さらに、前記浸透制御層を含む前記最終覆土層の上面に排水のための勾配を設けたことを特徴とする。
In order to solve the above-described problems, the present invention provides, for example, a recess 51 capable of temporarily storing rainwater in a final soil covering layer covering the waste layer 3 buried in a landfill as shown in FIGS. 1 and 2. Is formed on the upper surface, and a permeation control layer 5 that allows water to permeate is provided so that the amount of water permeating the waste layer 3 can be controlled.
That is, the present invention forms the permeation control layer from a soil material, shapes the soil material so that the top surface of the permeation control layer has the plurality of recesses, and further defines the permeation control layer. A slope for drainage is provided on the upper surface of the final soil covering layer.

このように、雨水を一時的に貯留可能な凹部を上面に形成し、かつ水を浸透可能とする浸透制御層で廃棄物層を覆うことで、凹部に廃棄物の安定化に必要な雨水を一時貯留することができる。そして、貯留された水分は浸透制御層を通じて、徐々にかつ定常的に廃棄物層へ供給される。一方、余剰の雨水は浸透制御層の上部を排水勾配に従って覆土縁部に設けた排水溝等の排水設備へと導かれ、廃棄物層内へは浸透しない。
このように、廃棄物層に対して廃棄物の安定化に必要な量の水分を供給でき、余分な雨水の廃棄物層への浸透を防ぐことができる。また、廃棄物層への水分供給が漸次、定常的に行われるので、洗い出しの効果を阻害することがない。
In this way, a recess that can temporarily store rainwater is formed on the top surface, and the waste layer is covered with a permeation control layer that allows water to permeate. It can be temporarily stored. The stored moisture is supplied to the waste layer gradually and constantly through the permeation control layer. On the other hand, surplus rainwater is guided to drainage facilities such as drainage grooves provided on the edge of the soil covering the upper part of the permeation control layer according to the drainage gradient, and does not permeate into the waste layer.
In this way, an amount of moisture necessary for stabilizing the waste can be supplied to the waste layer, and penetration of excess rainwater into the waste layer can be prevented. In addition, since the water supply to the waste layer is performed gradually and constantly, the washing effect is not hindered.

また、本発明は、上記に記載の廃棄物最終処分場の最終覆土工法であって、例えば図1及び図2に示すように、土砂等の土質材料を使用して前記浸透制御層5を形成し、もしくは透水係数を制御可能なシート材料を使用して前記浸透制御層5を形成することを特徴とする。
即ち、本発明は、前記廃棄物層の上部に水性材料で形成したガス抜き層を積層すると共に、前記ガス抜き層をそのガス抜き層の上面に多数の凹部を有する形状に整形し、透水係数を制御可能なシート材料でガス抜き層の上部を覆うことで、前記浸透制御層を設け、さらに、前記浸透制御層を含む前記最終覆土層の上面に排水のための勾配を設けたことを特徴とする。
Further, the present invention is a final earth covering method for a waste final disposal site as described above, and for example, as shown in FIGS. 1 and 2, the permeation control layer 5 is formed using a soil material such as earth and sand. Alternatively, the permeation control layer 5 is formed by using a sheet material capable of controlling the water permeability coefficient.
That is, the present invention is to laminate a venting layer formed by translucent aqueous material on top of the waste layer, shaped in a shape having a plurality of depressions the venting layer on the upper surface of the venting layer, permeability Covering the upper part of the degassing layer with a sheet material capable of controlling the coefficient, providing the infiltration control layer, and further providing a gradient for drainage on the upper surface of the final covering layer including the infiltration control layer. Features.

本発明によれば、埋立地上部に降った雨量の内、廃棄物の安定化に必要な水分は廃棄物層へ浸透させ、それ以外の余剰な水分は埋立地外へ排水することができる。また、廃棄物層への水分供給が漸次、定常的に行われるので、洗い出しの効果を阻害することがない。
したがって、有害な浸出水の発生を抑制することで、その処理にかかる費用を低減でき、しかも、廃棄物の安定化を促進することで、最終処分場廃止に至るまでの期間を短縮することができる。これにより、最終処分場が埋立を完了した後(閉鎖後)、廃止に至るまでの維持・管理にかかる費用を大幅に低減できる利点がある。
According to the present invention, of the amount of rain that has fallen in the upper part of the landfill, moisture necessary for stabilizing the waste can be permeated into the waste layer, and other excess water can be drained outside the landfill. In addition, since the water supply to the waste layer is performed gradually and constantly, the washing effect is not hindered.
Therefore, by suppressing the generation of harmful leachate, the cost of the treatment can be reduced, and by promoting the stabilization of waste, the period until the final disposal site is abolished can be shortened. it can. As a result, after the final disposal site is completed (after closing), there is an advantage that the cost for maintenance and management until the disposal is completed can be greatly reduced.

以下、図を参照して本発明を実施するための最良の形態を詳細に説明する。
図1は本発明を適用した廃棄物最終処分場を示しており、1は遮水工、2は浸出水集排水設備、3は廃棄物層、4はガス抜き層、5は浸透制御層、51は凹部、6は表層、7は排水溝、8はガス抜き管である。
Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
FIG. 1 shows a waste final disposal site to which the present invention is applied. 1 is a water shielding work, 2 is a leachate collection and drainage facility, 3 is a waste layer, 4 is a degassing layer, 5 is a permeation control layer, Reference numeral 51 denotes a recess, 6 denotes a surface layer, 7 denotes a drainage groove, and 8 denotes a gas vent pipe.

すなわち、廃棄物最終処分場は、例えば地盤を掘削するか、もしくは自然の凹地形を利用したもので、図1に示すように、側面及び底面には遮水工1が施されている。遮水工1は、通常、合成樹脂やゴム製の遮水シートや鋼板等による従来公知の方式のものが採用され、有害な浸出水の流出を防ぐ構造となっている。
さらに、処分場の底部には浸出水集排水設備2が設けられており、遮水工1で囲まれた部分に廃棄物が埋め立てられて廃棄物層3が形成される。浸出水集排水設備2は、廃棄物層3内の浸出水を集水し、図示しない水処理施設に排水するもので、浸出水は水処理設備において浄化処理される。
That is, the waste final disposal site is, for example, excavating the ground or using natural concave terrain, and as shown in FIG. As the water-impervious work 1, a conventionally well-known method using a synthetic resin, a rubber impermeable sheet, a steel plate, or the like is usually employed, and has a structure that prevents harmful leachate from flowing out.
Further, a leachate collection and drainage facility 2 is provided at the bottom of the disposal site, and waste is buried in a portion surrounded by the impermeable work 1 to form a waste layer 3. The leachate collection and drainage facility 2 collects leachate in the waste layer 3 and drains it to a water treatment facility (not shown), and the leachate is purified by the water treatment facility.

なお、図示のように、処分場の周囲に排水溝7が施工されるとともに、遮水工1の内側にガス抜き管8が設置されている。
また、埋め立てられる廃棄物層3の最終形状は、図示のように、必要に応じて中央部を高くし、排水のための勾配が確保されている。廃棄物の埋立が完了すると、その廃棄物層3の上部には、廃棄物の露出・飛散などを防ぐために最終覆土工事が行われる。
In addition, as shown in the drawing, a drainage groove 7 is constructed around the disposal site, and a gas vent pipe 8 is installed inside the impermeable construction 1.
Further, as shown in the figure, the final shape of the waste layer 3 to be landfilled is made higher in the center as necessary to ensure a gradient for drainage. When the landfill of the waste is completed, a final soil covering work is performed on the top of the waste layer 3 in order to prevent the exposure and scattering of the waste.

最終覆土工事において、廃棄物層3の上部に、必要に応じて先ず、透水性材料で構成されたガス抜き層4を所定の厚みで積層する。次に、そのガス抜き層4の上部を浸透制御層5で覆う。そして最後に、最終覆土後の上部の利用方法に従い、必要に応じて表層6を積層し、最終覆土工事を完了する。   In the final earth covering work, a degassing layer 4 made of a water-permeable material is first laminated with a predetermined thickness on the waste layer 3 as necessary. Next, the upper part of the degassing layer 4 is covered with the permeation control layer 5. And finally, according to the utilization method of the upper part after the last soil covering, the surface layer 6 is laminated | stacked as needed, and the last soil covering construction is completed.

図示例において、浸透制御層5は土砂等の土質材料により構成したものであり、図2に拡大して示したように、上面に凹部51を有する形状に整形する。
このように、土質材料により構成された浸透制御層5の積層厚は、使用する土質材料の透水係数、凹部51の形状、及び当該地域の年間降水量等により所定の積層厚とすることができる。すなわち、廃棄物の安定化に必要な水分量が一定期間内に通過する積層厚とする。
In the illustrated example, the permeation control layer 5 is composed of a soil material such as earth and sand, and is shaped into a shape having a recess 51 on the upper surface as shown in an enlarged view in FIG.
Thus, the lamination thickness of the seepage control layer 5 made of a soil material can be set to a predetermined lamination thickness according to the permeability coefficient of the soil material to be used, the shape of the recess 51, the annual precipitation in the region, and the like. . That is, the layer thickness is such that the amount of water necessary for stabilizing the waste passes within a certain period.

以上の最終覆土工法によれば、土質材料で構成された浸透制御層5により廃棄物層3へ浸透する水分量をコントロールすることができる。
すなわち、浸透制御層5上面の凹部51に廃棄物の安定化に必要な量の雨水が一時貯留され、その雨水は浸透制御層5からガス抜き層4を介して徐々に廃棄物層3に供給される。また、余剰の雨水は浸透制御層5の上面を排水勾配に従って覆土層縁部の排水溝7などの排水設備へと導かれ、埋立地外へ排水されるので、廃棄物層3内への浸透が防止される。
According to the above final covering method, the amount of moisture that permeates the waste layer 3 can be controlled by the permeation control layer 5 made of a soil material.
That is, the amount of rainwater necessary for stabilizing the waste is temporarily stored in the recess 51 on the upper surface of the permeation control layer 5, and the rainwater is gradually supplied from the permeation control layer 5 to the waste layer 3 through the gas vent layer 4. Is done. In addition, surplus rainwater is led to drainage facilities such as drainage grooves 7 at the edge of the cover soil layer according to the drainage gradient on the upper surface of the permeation control layer 5 and drained outside the landfill, so that it penetrates into the waste layer 3. Is prevented.

このように、廃棄物層3への過剰な雨水の浸透を制御し、廃棄物層3から発生する浸出水を低減しつつ、安定化に必要な量の水分を廃棄物層3に浸透させることができる。また、廃棄物層3への水分供給が漸次、定常的に行われるので、廃棄物層3内部の水みちの形成を防止できる。   In this way, excessive penetration of rainwater into the waste layer 3 is controlled, and leachate generated from the waste layer 3 is reduced, while the amount of moisture necessary for stabilization is allowed to penetrate into the waste layer 3. Can do. Further, since the water supply to the waste layer 3 is performed gradually and constantly, the formation of a water channel inside the waste layer 3 can be prevented.

以上の図示例では、土質材料による浸透制御層5としたが、浸透制御層5は、透水係数が制御可能なシート(浸透制御シート)材料を使用しても構成できる。例えば下層のガス抜き層などの層形状を、前述したように、上面に凹部51を有する形状に整形しておき、その上を浸透制御シートで覆って浸透制御層5とする。
このような浸透制御シートで浸透制御層5を構成する場合、凹部51の形状、及び当該地域の年間降水量等により浸透制御シートの透水係数を決定して、その所定の透水係数の浸透制御シートを使用する。
以上の浸透制御シートによる浸透制御層5によっても、前述した土質材料による浸透制御層5と同様に、廃棄物層3へ浸透する水分量をコントロールすることができ、すなわち、同様の作用効果が得られる。
通常、最終処分場ではガス抜き管8を設置するので、廃棄物中の有機物分解のために必要な空気(酸素)の供給は確保されていることに加え、浸透制御層5を土質材料で構成した場合、浸透制御シートで構成した場合のどちらにおいても、空気(酸素)は浸透制御層5からガス抜き層4を介しても廃棄物層3へ供給されることから、廃棄物層3内は好気的な条件を保つことができる。
In the above illustrated example, the permeation control layer 5 is made of a soil material, but the permeation control layer 5 can also be configured by using a sheet (permeation control sheet) material whose water permeability coefficient can be controlled. For example, as described above, a layer shape such as a lower gas vent layer is shaped into a shape having a recess 51 on the upper surface, and the top is covered with a permeation control sheet to form the permeation control layer 5.
When the permeation control layer 5 is formed of such a permeation control sheet, the permeation coefficient of the permeation control sheet is determined based on the shape of the recess 51 and the annual precipitation amount of the area, and the permeation control sheet having the predetermined permeation coefficient. Is used.
The permeation control layer 5 using the above permeation control sheet can also control the amount of water penetrating into the waste layer 3 in the same manner as the above-described permeation control layer 5 made of the soil material, that is, the same effect can be obtained. It is done.
Usually, since a gas vent pipe 8 is installed at the final disposal site, supply of air (oxygen) necessary for organic matter decomposition in the waste is ensured, and the permeation control layer 5 is made of a soil material. In this case, air (oxygen) is supplied from the permeation control layer 5 to the waste layer 3 through the degassing layer 4 in either case where the permeation control sheet is used. Can keep aerobic conditions.

なお、本発明は以上の実施形態に限定されるものではない。すなわち、実施形態では本発明の廃棄物最終処分場における最終覆土工法について詳細に説明したが、この最終覆土工法は、計画中の最終処分場以外にも、現在埋立中や埋立が完了し閉鎖した後の最終処分場に対しても適用することができる。
また、その他、具体的な細部構造等についても適宜に変更可能であることは勿論である。
In addition, this invention is not limited to the above embodiment. That is, in the embodiment, the final earth covering method in the waste final disposal site of the present invention has been described in detail, but this final earth covering method has been closed during the current landfill and landfilling other than the planned final disposal site. It can also be applied to later final disposal sites.
In addition, it is needless to say that other specific detailed structures can be appropriately changed.

本発明を適用した一実施形態の構成を示すもので、廃棄物最終処分場の最終覆土後の一例を示した断面説明図である。BRIEF DESCRIPTION OF THE DRAWINGS It is sectional explanatory drawing which showed the structure of one Embodiment to which this invention is applied, and showed an example after the final covering of a waste final disposal site. 図1の最終覆土部分の拡大図である。FIG. 2 is an enlarged view of a final soil covering portion in FIG. 1.

符号の説明Explanation of symbols

1 遮水工
2 浸出水集排水設備
3 廃棄物層
4 ガス抜き層
5 浸透制御層
51 凹部
6 表層
7 排水溝
8 ガス抜き管
DESCRIPTION OF SYMBOLS 1 Impermeable work 2 Leachate collection and drainage equipment 3 Waste layer 4 Gas vent layer 5 Permeation control layer 51 Recess 6 Surface layer 7 Drain groove 8 Gas vent pipe

Claims (2)

埋立地に埋め立てられた廃棄物層を覆う最終覆土層内に、雨水を一時的に貯留可能な凹部を上面に多数形成し、かつ水を浸透可能とする浸透制御層を設けて、廃棄物層に浸透する水分量をコントロールできるようにする廃棄物最終処分場の最終覆土工法であって、
前記浸透制御層を、土質材料により形成すると共に、その浸透制御層の上面に前記多数の凹部を有する形状となるように土質材料を整形し、
さらに、前記浸透制御層を含む前記最終覆土層の上面に排水のための勾配を設けたことを特徴とする廃棄物最終処分場の最終覆土工法。
In the final soil covering layer covering the waste layer buried in the landfill, a waste layer is provided with a large number of recesses on the upper surface that can temporarily store rainwater and an infiltration control layer that allows water to permeate. It is a final earth covering method of a waste final disposal site that makes it possible to control the amount of moisture penetrating into
The permeation control layer is formed of a soil material, and the soil material is shaped so as to have a shape having the plurality of recesses on the top surface of the permeation control layer,
Furthermore, a final earth covering method for a waste final disposal site , wherein a slope for drainage is provided on the upper surface of the final earth covering layer including the infiltration control layer .
埋立地に埋め立てられた廃棄物層を覆う最終覆土層内に、雨水を一時的に貯留可能な凹部を上面に多数形成し、かつ水を浸透可能とする浸透制御層を設けて、廃棄物層に浸透する水分量をコントロールできるようにする廃棄物最終処分場の最終覆土工法であって、
前記廃棄物層の上部に水性材料で形成したガス抜き層を積層すると共に、前記ガス抜き層をそのガス抜き層の上面に多数の凹部を有する形状に整形し、
透水係数を制御可能なシート材料でガス抜き層の上部を覆うことで、前記浸透制御層を設け、
さらに、前記浸透制御層を含む前記最終覆土層の上面に排水のための勾配を設けたことを特徴とする廃棄物最終処分場の最終覆土工法。
In the final soil covering layer covering the waste layer buried in the landfill, a waste layer is provided with a large number of recesses on the upper surface that can temporarily store rainwater and an infiltration control layer that allows water to permeate. It is a final earth covering method of a waste final disposal site that makes it possible to control the amount of moisture penetrating into
With laminating a venting layer formed by translucent aqueous material on top of the waste layer, shaped in a shape having a plurality of depressions the venting layer on the upper surface of the venting layer,
By covering the upper part of the degassing layer with a sheet material capable of controlling the hydraulic conductivity, the permeation control layer is provided,
Furthermore, a final earth covering method for a waste final disposal site , wherein a slope for drainage is provided on the upper surface of the final earth covering layer including the infiltration control layer .
JP2004066003A 2004-03-09 2004-03-09 Final earth covering method for waste final disposal site Expired - Lifetime JP4299700B2 (en)

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