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ACTIVE CONTROL OF LEACHATE MOVEMENT USING LANDFILL STRUCTURE -NUMERICAL STUDY-
( Yasumasa Tojo ),( Nobutoshi Tanaka ),( Toshihiko Matsuto ),( Takayuki Matsuo ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
Numerical study was carried out to investigate active control of water flow by landfill structure. Formulas that explain water movement in each part of a landfill were derived from past studies. Three types of landfill structure were assumed and actual rainfall data of three cities were adopted. Water diversion at each landfill part and the pressure head on the landfill bottom were evaluated. As a result, the following information was obtained. Hydraulic conductivity of intermediate cover soil is important to promote lateral diversion and to control the vertical infiltration ratio. Application of a capillary barrier at the landfill bottom is absolutely effective for avoiding a positive pressure head on the liner.
매립 구조를 이용한 침출수 이동의 적극적인 제어 - 수학적 연구 -
( Yasumasa Tojo ),( Nobutoshi Tanaka ),( Toshihiko Matsuto ),( Takayuki Matsuo ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.2
매립 구조에 의해서 물 흐름의 적극적 제어를 조사하기 위해 수학적 연구가 수행되었다. 매립지의 각 부분에서 물의 흐름을 설명하기 위한 식이 이전의 연구에서 도출되었다. 매립 구조의 3가지 형식이 가정되었고, 3도시의 실제 강우자료가 적용되었다. 매립지 각 부분에서의 물의 우회와 매립지 바닥에서의 압력 수두를 평가했다. 이 결과, 다음과 같은 정보를 얻었다. 중간 복토 토양의 투수성은 수평 이동을 촉진하고, 수직 침투율을 제어하기 위해 중요하다. 매립지 바닥에 차단벽을 적용하는 것이 라이너에 양압이 걸리는 것을 막는데 효과적인 방법이다. Numerical study was carried out to investigate active control of water flow by landfill structure. Formulas that explain water movement in each part of a landfill were derived from past studies. Three types of landfill structure were assumed and actual rainfall data of three cities were adopted. Water diversion at each landfill part and the pressure head on the landfill bottom were evaluated. As a result, the following information was obtained. Hydraulic conductivity of intermediate cover soil is important to promote lateral diversion and to control the vertical infiltration ratio. Application of a capillary barrier at the landfill bottom is absolutely effective for avoiding a positive pressure head on the liner.
( Taira Ikeda ),( Yasumasa Tojo ),( Takayuki Matsuo ),( Toshihiko Matsuto ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1
Three sanitary landfills have been constructed in the West Bank, Palestine, by international cooperation from several years ago, in order to discontinue the open dumping that had been done up to now. Because of very dry climate feature, management of leachate generated from these landfills mainly relies on evaporation. However, as the side effect, serious odor problem became serious (especially, ammonia odor emitted from leachate pond). Further, because leachate more than the planned amount was generated, it overflows to outside of sites. In order to solve these problems, water treatment facility is needed. However, treated water is going to be used for irrigation because there is no river for discharging effluent. Although the introduction of a reverse osmosis membrane treatment facility (RO) is proposed at the site, leachate generated ate these sites is highly contaminated. Since the sustainability of RO treatment is greatly affected by the quality of the influent, it is necessary to consider pretreatment. Thus, the purpose of this study was set to propose a pretreatment process that can be taken at the site. Because acquisition of the real leachate generated at the site was difficult, artificially simulated leachate was created by using digestion sludge obtained from methane fermentation facility. Some reagents were added to assimilate to inorganic matter concentration of leachate generated at the site. Regarding organic matter concentration, both high BOD/COD and low BOD/COD were confirmed in leachate data of two sites. Artificially simulated leachate which had a high BOD/COD value was created by using some low molecular organic compounds. On the other hand, it was impossible to create simulated leachate which has a low BOD/COD value because high molecular organic compounds used (humic acid, tanic acid) did not dissolve well in digestion sludge. In this study, two physicochemical treatment methods, coagulation sedimentation with polyferric sulfate and fenton treatment were examined, targeted to reduce organic matter concentration. In every experiment, TOC was measured as an index of organic matter concentration. Regarding coagulation sedimentation, TOC removal rate increased to about 25% as the amount of polyferric sulfate added increased, but it did not rise any further. On the other hand, although fenton treatment to simulated leachate caused extremely severe foaming, TOC removal rate was less than 10%. Both results were not effective for pretreatment because organic matter composition of simulated leachate used was mainly composed of low molecular organic compounds. As a consequence, two treatment methods used in this study are ineffective against leachate which has high concentration of low molecular organic compounds. Because local leachate is likely to contain many of these, it is necessary to consider a biological treatment process.