A system tradeoff model for processing options for household plastic waste |
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Authors: | Steven Kraines Hitoshi Shigeoka Hiroshi Komiyama |
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Affiliation: | (1) Department of Chemical Systems Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113, Japan, |
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Abstract: | With the "Containers and Packaging Recycling Law", Japan has shown a firm conviction towards the promotion of recycling.
Waste can be "recycled", i.e. resource value of waste material can be recovered, in many ways, from material recycling to
energy recycling. Alternatively, waste can be reduced or disposed of in landfills. A system tradeoff model is developed from
component process technology models of six different recycling and disposal options for household plastic waste processing:
plastic pellet production, refuse derived fuel production, oil production, waste incineration to produce electricity, use
of waste plastic as a coke substitute, and incineration for volume reduction. These technologies are compared with the case
where all waste plastic is land filled. Models based on plant data, laboratory experiments, and theoretical considerations
of scale effects and mass balances are developed to calculate the cost, energy consumption, CO2 emission, and land fill occupancy. The models also calculate the valued products of each technology and convert them into
cost, energy, CO2, and landfill occupancy using life cycle inventory data. These values are subtracted from the outputs of the waste processing
models to obtain overall performances for each technology. The overall tradeoff system model is then used to evaluate several
scenarios of plastic recycling and disposal technologies in Tokyo.
Electronic Publication |
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