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Life cycle and economic assessment of source-separated MSW collection with regard to greenhouse gas emissions: a case study in China

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Abstract

In China, the continuously increasing amount of municipal solid waste (MSW) has resulted in an urgent need for changing the current municipal solid waste management (MSWM) system based on mixed collection. A pilot program focusing on source-separated MSW collection was thus launched (2010) in Hangzhou, China, to lessen the related environmental loads. And greenhouse gas (GHG) emissions (Kyoto Protocol) are singled out in particular. This paper uses life cycle assessment modeling to evaluate the potential environmental improvement with regard to GHG emissions. The pre-existing MSWM system is assessed as baseline, while the source separation scenario is compared internally. Results show that 23 % GHG emissions can be decreased by source-separated collection compared with the base scenario. In addition, the use of composting and anaerobic digestion (AD) is suggested for further optimizing the management of food waste. 260.79, 82.21, and −86.21 thousand tonnes of GHG emissions are emitted from food waste landfill, composting, and AD, respectively, proving the emission reduction potential brought by advanced food waste treatment technologies. Realizing the fact, a modified MSWM system is proposed by taking AD as food waste substitution option, with additional 44 % GHG emissions saved than current source separation scenario. Moreover, a preliminary economic assessment is implemented. It is demonstrated that both source separation scenarios have a good cost reduction potential than mixed collection, with the proposed new system the most cost-effective one.

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Acknowledgment

This project is supported by the National Basic Research Program of China (no. 2011CB201506).

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Authors and Affiliations

  1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Zheda Road 38, Hangzhou, People’s Republic of China

    Jun Dong, Mingjiang Ni, Yong Chi, Daoan Zou & Chao Fu

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  1. Jun Dong
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  2. Mingjiang Ni
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  3. Yong Chi
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  4. Daoan Zou
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  5. Chao Fu
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Correspondence to Yong Chi.

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Responsible editor: Philippe Garrigues

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Dong, J., Ni, M., Chi, Y. et al. Life cycle and economic assessment of source-separated MSW collection with regard to greenhouse gas emissions: a case study in China. Environ Sci Pollut Res 20, 5512–5524 (2013). https://doi.org/10.1007/s11356-013-1569-1

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  • DOI: https://doi.org/10.1007/s11356-013-1569-1

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