Estimation and field measurement of methane emission from waste landfills in Hanoi, Vietnam |
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Authors: | Tomonori Ishigaki Chu Van Chung Nguyen Nhu Sang Michihiko Ike Koji Otsuka Masato Yamada Yuzo Inoue |
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Institution: | 1. Department of Environmental Solution Technology, Ryukoku University, 1-5 Yokotani, Seta-Oe, Otsu, Shiga, 520-2194, Japan 2. Hanoi Urban Environmental Cooperation, Hanoi, Socialist Republic of Vietnam 3. The Division of Sustainable Energy and Environmental Engineering, Graduate School of Engineering, Osaka University, Osaka, Japan 4. Japan Environmental Sanitation Center, Kawasaki, Japan 5. Research Center for Material Cycles and Waste Management, National Institute for Environmental Studies, Tsukuba, Japan
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Abstract: | A methodology for estimating the methane emissions from waste landfills in Hanoi, Vietnam, as part of a case study on Asian
cities, was derived based on a survey of documents and statistics related to waste management, interviews with persons in
charge, and field investigations at landfill sites. The waste management system in Hanoi was analyzed to evaluate the methane
emissions from waste landfill sites. The quantity of waste deposited into the landfill was evaluated from an investigation
of the waste stream. The composition of municipal waste was surveyed in several districts in the Hanoi city area, and the
quantities of degradable organic waste that had been deposited into landfill for the past 15 years were estimated. Field surveys
on methane emissions from landfills of different ages (0.5, 2, and 8 years) were conducted and their methane emissions were
estimated to be 120, 22.5, and 4.38 ml/min/m2, respectively. The first-order reaction rate of methane generation was obtained as 0.51/year. Methane emissions from waste
landfills were calculated by a first-order decay model using this emission factor and the amount of landfilled degradable
waste. The estimates of methane emissions using the model accorded well with the estimates of the field survey. These results
revealed that methane emissions from waste landfills estimated by regional-specific and precise information on the waste stream
are essential for accurately determining the behavior of methane emissions from waste landfills in the past, present, and
future. |
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Keywords: | Greenhouse effect gas Methane Waste landfill Clean development mechanism Vietnam |
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