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Life-cycle greenhouse gas emissions and economic analysis of alternative treatments of solid waste from city markets in Vietnam

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Abstract

We utilize life cycle assessment to trace conversion of degradable organic carbon (DOC) contained in organic waste from city markets in Da Nang, Vietnam. Our methodology makes explicit the process of conversion of DOC under aerobic and anaerobic conditions, as well as the balance of nutrients. Greenhouse gas emissions were calculated for six alternative scenarios: (i) anaerobic landfilling (current situation); (ii) semi-aerobic landfilling; (iii) landfill gas capture; (iv) composting; (v) pre-composting before landfill; and (vi) biogas production. We calculate that 1 t of waste in anaerobic landfilling emits 1.70 t CO2-eq. with life-cycle perspective. Lowest emission occurs in biogas scenario with 0.26 t CO2-eq./t. Composting occupies an intermediate position with 0.39 t CO2-eq./t. Likewise, we estimate that cost of emission reduction in solid waste sector of Vietnam is 15.13 US$/t CO2-eq., given by alternative of composting and taking anaerobic landfilling as reference. On the other hand, if social cost of carbon (SCC) is incorporated lowest cost to treat 1 t of waste is given by composting and semi-aerobic landfilling at discount rate of 5 %. However, using lower discount rates, and consequently higher values of SCC, composting and biogas production become the alternatives with lowest treatment costs.

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Acknowledgments

The authors acknowledge anonymous reviewers whose comments and suggestions contributed to improve this manuscript.

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Authors and Affiliations

  1. Graduate School of Environmental Engineering, University of Kitakyushu, Kitakyushu, Japan

    Suehiro Otoma & Ricardo Diaz

  2. 1-1 Hibikino, Wakamatsu-ku, Kitakyushu, 808-0135, Fukuoka, Japan

    Ricardo Diaz

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  1. Suehiro Otoma
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Correspondence to Ricardo Diaz.

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Otoma, S., Diaz, R. Life-cycle greenhouse gas emissions and economic analysis of alternative treatments of solid waste from city markets in Vietnam. J Mater Cycles Waste Manag 19, 70–87 (2017). https://doi.org/10.1007/s10163-015-0380-0

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  • DOI: https://doi.org/10.1007/s10163-015-0380-0

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