Life Cycle Evaluation And Economic
Considerations Of The Pyrolysis-gasification Of
Municipal Solid Waste In Singapore
Author(s)
H. H. Khoo, R. B. H. Tan, S. Salim & Y. M. Wu
Abstract
Due to limited territory for landfills in Singapore, incineration is given top
priority for the treatment of wastes that are not recovered, reused or recycled.
Unfortunately, incineration emissions contain gases which possess high polluting
characteristics that can severely affect human health in the long run. In this
paper, a pyrolysis-gasification technology is introduced and compared with an
existing incinerator operating in Singapore. Pyrolysis-Gasification technologies
have received increasing attention because the process can produce high quality
fuels, such as Syngas.
A life cycle assessment approach was employed to study the stream of MSW
– from generation to its final conversion. The economic considerations,
including social costs of air emissions associated with the stream of MSW at
each stage, as well as, the economic values of the final products (electricity or
Syngas), was evaluated.
It was projected that the existing incineration and proposed plants’ annual
values (PTotal) were nearly similar – approximately 70 million/year without
considering the social or economic costs of pollution. When the costs of air
emissions were taken into account, the new pyrolysis-gasification technology
displayed a significant advantage over Incineration. Sensitivity analysis
demonstrated that the time to \“pay back” the capital expenditure for the proposed
plant changed considerably with fluctuations in the amount of Syngas produced
and operating costs, but less with capital costs.
Keywords: municipal solid waste (MSW), incineration, pyrolysis-gasification,
life cycle approach, cost and economic considerations.
Keywords
municipal solid waste (MSW), incineration, pyrolysis-gasification,
life cycle approach, cost and economic considerations.
Related Book
Other papers in this volume
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