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RISS 인기검색어
- 검색키워드
- 저자 : ( Yuka Ogata ) (검색결과 4 건)
- 무료
- 기관 내 무료
- 유료
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Case study of reduction of overflow risk in landfill leachate by constructed wetlands in Thailand
( Yuka Ogata ),( Toinonori Ishigaki ),( Yosliitaka Ebie ),( Noppharit Suttliasil ),( Chayanid Witthayaphirom ),( Chart Chiemchaisri ),( Masato Yainada ) 한국폐기물자원순환학회(구 한국폐기물학회) 2017 한국폐기물자원순환학회 심포지움 Vol.2017 No.1
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Monitoring of Hydrogen Sulfide from an Industrial Waste Landfill in Japan
( Noppharit Sutthasil ),( Tomonori Ishigaki ),( Yuka Ogata ),( Kazuto Endo ),( Masato Yamada ),( Masanao Nagamori ),( Osamu Oishi ),( Yoshinori Yabuki ),( Tanaka Hirokazu ) 한국폐기물자원순환학회(구 한국폐기물학회) 2018 한국폐기물자원순환학회 심포지움 Vol.2018 No.1
Landfill management in Japan was developed more than Centuries. At industrial rapid growth era, numbers of waste were disposed with less control, such as co-disposal of Construction and Demolition waste (C&D waste) and organic Municipal Solid Wastes (MSW). Generally, Hydrogen sulfide (H<sub>2</sub>S) is detectable in ppm by human as odor, but more seriously it causes toxic effect in hundreds ppm. H<sub>2</sub>S is often generated in landfill containing sulfate source (such as gypsum board) and organic waste thorough the activity of the Sulfate Reducing Bacteria (SRB). This study was carried out to investigate the emission behavior and environmental parameters related to H<sub>2</sub>S generation in a landfill under aftercare phase, which has been disposed of C&D waste, and to develop the methodology to assess the environmental situation in landfills to be monitored. This survey was also involved in the project that aim to develop the methodology of appropriate management of the landfills. The objected landfill was located nearby the river and was operated by private sector. After the “standard of landfill disposal” regulation was enforced in Japan, this landfill was closed and started to monitoring. Figure 1 shows schematic of geological section of landfill, the area of dumping was mountainous, North and Eastern side of landfill was mounted to the hill called ‘Upper Zone’. South and Western side called ‘Lower Zone’. The slope of landfill surface was from upper to lower part. The approximate landfill surface is 4000 m<sup>2</sup>. Landfill investigation was conducted on October 2017. The location for measurement of surface gas emission by static chamber method was selected by grid placing. Soil gas concentration was measured by a gas analyzer and gas detecting tube. Water quality from landfill layer in monitoring well was analyzed in laboratory. The results show H<sub>2</sub>S gas was detected 5 out of 29 grid points from 0.7 m beneath cover soil in range 0.2-800 ppm. These H<sub>2</sub>S gas concentrations were related to surface H<sub>2</sub>S emissions which emitted in range 0.3-37.7 l/m<sup>2</sup>/d. The detected H<sub>2</sub>S emitted points were located at the lower zone of this landfill. In the same area, CH<sub>4</sub> emission were found in 10 out of 29 points in range 0.1-62.7 l/m<sup>2</sup>/d. H<sub>2</sub>S emission and CH<sub>4</sub> emission were negatively correlated. In contrast to the lower zone, CH<sub>4</sub> emission was detected at few points and no H<sub>2</sub>S gas was found at the upper zone. It is widely known that SRB and Methane Generating Bacteria inhabited or competitive of carbon source under anaerobic condition. Landfill gas results indicated that anaerobic degradation was comparably active in lower zone due to the existing of organic matter inside waste body. To compare biogas generation from lower and upper zone, CH<sub>4</sub> and CO<sub>2</sub> emissions from lower zone was about 10.1 and 3.2 times higher than that from upper zone, respectively. The higher degradation rate explain by the different amount of organic matter from upper to lower zone. Quality of inner water of landfill layer in the monitoring wells which located in lower zone were analyzed. The SO<sub>4</sub> concentration were in range 110-710 mg/l. Low concentration of dissolved oxygen (0.68 mg/l) and remaining of organic carbon (33.7 mg/l) were confirmed in inner water of landfill. These would possibly provide condition of H<sub>2</sub>S generation. From the result, landfill gas emission still active even the landfill already close for several years. It could suggest that the intensive and log-term monitoring program for this landfill must be necessary. It was also shown that the integration of monitoring of behavior of gas emission and dissolved component must be necessary to identify the practical situation of landfills, and to apply for future investigation in terms of improving the accuracy and simplification of methodology.
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Behavior of Green House Gas Emission from Temporary Storage Sites for Disaster Waste Management
( Tomonori Ishigaki ),( Masahiro Sato ),( Yuka Ogata ),( Masato Yamada ) 한국폐기물자원순환학회(구 한국폐기물학회) 2014 한국폐기물자원순환학회 심포지움 Vol.2014 No.1
Huge amount of disaster waste was generated by the Great East Japan Earthquake and Tsunami. It was estimated that 20 million tons of disaster waste and 10 million tons of Tsunami debris has been generated at devastated area. Since local capacity of waste treatment was deficient for such a large quantity of disaster waste, temporary storage must be necessary until the establishment of appropriate management scheme. During a few year storage of disaster waste, several environmental impacts could be concerned. One of global impacts is the emission of greenhouse effect gases (GHGs) from the organics waste. In this study, the behavior of GHGs emission from the sites of temporary management for disaster waste has been investigated. The methane emission from the temporary storage pile of combustible fraction (mainly wood waste) was distributed from -0.0014 to 0.0023 L/hr/m<sup>2</sup>. Arithmetic mean and coefficient of variance was 0.0013 L/hr/m<sup>2</sup>±88% and median was 0.0014 L/hr/m<sup>2</sup>. The carbon dioxide emission was 1000 times higher than methane emission at that site. It indicated that the aerobic deterioration of organic waste in the temporary storage of combustible fraction would be dominated rather than anaerobic mechanism. On the other hand, The methane emission from the temporary disposal site of fishery waste was highly fluctuated from -0.024 to 30 L/hr/m<sup>2</sup>. Arithmetic mean and coefficient of variance was 4.3 L/hr/m<sup>2</sup>±230% and median was 0.0087 L/hr/m<sup>2</sup>. The waste degradation in the temporary disposal site of fishery waste must follow the anaerobic manner. The methane emission from the pile of combustible fraction by first order reaction model could be assumed 0.73 L-CH<sub>4</sub>/hr/kg-waste (15 L-CO<sub>2</sub>eq/hr/kg-waste), which was calculated as the emission at July 2011. The emission factor from unit waste was calculated as 87 L L-CH<sub>4</sub>/ kg-waste (1830 L-CO<sub>2</sub>eq/kg-waste).
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