Wanida Wanichpongpan. Life Cycle Assessment of Municipal Solid Waste Landfill : A Case Study in Thailand. Master's Degree(Environmental Technology). King Mongkut's University of Technology Thonburi. Library. : King Mongkut's University of Technology Thonburi, 2004.
Life Cycle Assessment of Municipal Solid Waste Landfill : A Case Study in Thailand
Abstract:
Generation of municipal solid waste (MSW) increases with socio-economic development.
In developing countries like Thailand, rapid population growth has Wher added to the
intensity of waste generation. In 1999, solid waste was generated nationwide
approximately 37,879 tons/day or around 14 million tons per annum. Landfill is a very
popular way to manage MSW because it is easy to manage at low cost. Unfortunately,
approximately only 10% proper landfill exists in Thailand. Improper management of
methane fiom MSW, which could safeguard the depletion natural energy resource since it
is a fuel, is causing severe environmental concern due to its contribution to global warming
when released to the environment.
This research involves the environmental assessment of mainly methane emission fiom
MSW landfill, and describes control methods to eliminate or minimize these impacts
including energy recovery fiom landfill gas of MSW landfill in Thailand. Life Cycle
Assessment (LCA) is used as the analytical tool to evaluate the environmental
consequences of landfilling holistically, across its entire life. The economic implications of
the control methods are also briefly assessed.
The results shown that in Scenario I, using LFG for generating electricity, has potential to
reduce GHGs emission with a value of 142,587,722 kg COz-eq. resulting in a net GWP of
149,329,373 kg COz-eq. Consequently, the overall GWP Scenario I1 is greater than
Scenario I by about 666,849,470 kg C02-eq. for the whole life cycle of MSW landfill.
Also, the Scenario I generated a net revenue of 153.5 million Baht fiom selling of
electricity to the grid whereas Scenario II had a net cost of 193.7 million Baht. For the
whole life cycle of the project, LFG can generate 192,296 MWh of electricity or 131.7
kwh of electricity is generated per ton of 31SlY Dunng waste collection, Scenario I
ehtted GHGs with a value of 21,963,792 kg Cot-eq. whereas Scenario II emitted
4,399,130 kg ~02-&D. espite this, the net GWP of Scenario I is smaller than Scenario I1 by
a factor of around 5.5. Thus, the idea of centralization of waste disposal for energy
utilization purpose is possible in the nearby provinces. Environmental and economic
benefits are attractive. Nevertheless, it is required to make feasibility analyses of those
projects. Increasing the methane oxidation rate in Scenario I by 5% and 10% decreases the
net GWP from landfill by 7.6% and 18.7% respectively. Thus, the results are sensitive to
methane oxidation rate. In the Scenario If, increasing the methane oxidation rate by 5% and
10%>esulted in an almost linear decrease of net GWP kom landfill by 5.55% and 11.1%
respectively. However, if we look at the absolute values, it is clear that the amount of GWP
reduction in Scenario II is much larger than in Scenario I. This is an important point to
consider in future studies.
Hence, centralized large landfills are suitable for LFG-to-energy projects both in terms of
environment and economics. Meanwhile, methane oxidation can be enhanced to reduce
fugitive emissions in small landfills. This study showed the benefit of using a life cycle
approach for evaluating the impacts from MSW landfill in Thailand. The result will be able
to support the policy makers (governor, sanitary engineer, landfill operator etc) to find a
suitable way to manage waste in the municipality.
King Mongkut's University of Technology Thonburi. Library