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Cosmic exergy based ecological assessment for a wetland in Beijing


  • Chen, Z.M.
  • Chen, B.
  • Chen, G.Q.


Wetlands research and restoration has become one of the critical concern due to their importance in providing ecosystem services. This study proposes a holistic methodology to assess the wetland ecosystem based on cosmic exergy as a thermodynamic orientor. This new approach is applied to two typical wastewater treatment facilities (an activated sludge system and a cyclic activated sludge system) and to a constructed wetland ecosystem in Beijing for comparison. Results show that the Beijing wetland ecosystem gains positive net present ecological value of 3.08E+14 Jc regarding its total life cycle. Comparison with the activated sludge system and cyclic activated sludge system, shows that the wetland ecosystem has greater dependencies on local resources (22% vs. 0% vs. 0%) and renewable resources (67% vs. 38% vs. 31%) as well as a larger ecological sustainability index (0.64157 vs. 0.00005 vs. 0.00008). This implies that the wetland ecosystem is more environmentally friendly and sustainable method for water treatment.

Suggested Citation

  • Chen, Z.M. & Chen, B. & Chen, G.Q., 2011. "Cosmic exergy based ecological assessment for a wetland in Beijing," Ecological Modelling, Elsevier, vol. 222(2), pages 322-329.
  • Handle: RePEc:eee:ecomod:v:222:y:2011:i:2:p:322-329
    DOI: 10.1016/j.ecolmodel.2010.09.023

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    References listed on IDEAS

    1. Zhang, Bo & Chen, G.Q., 2010. "Physical sustainability assessment for the China society: Exergy-based systems account for resources use and environmental emissions," Renewable and Sustainable Energy Reviews, Elsevier, vol. 14(6), pages 1527-1545, August.
    2. repec:eee:ecomod:v:220:y:2009:i:3:p:397-410 is not listed on IDEAS
    3. Valero, A., 2006. "Exergy accounting: Capabilities and drawbacks," Energy, Elsevier, vol. 31(1), pages 164-180.
    4. Sciubba, Enrico, 2003. "Extended exergy accounting applied to energy recovery from waste: The concept of total recycling," Energy, Elsevier, vol. 28(13), pages 1315-1334.
    5. Wall, Göran, 1990. "Exergy conversion in the Japanese society," Energy, Elsevier, vol. 15(5), pages 435-444.
    6. Chen, G.Q. & Chen, B., 2009. "Extended-exergy analysis of the Chinese society," Energy, Elsevier, vol. 34(9), pages 1127-1144.
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    Cited by:

    1. Kai Yin & Dengsheng Lu & Yichen Tian & Qianjun Zhao & Chao Yuan, 2014. "Evaluation of Carbon and Oxygen Balances in Urban Ecosystems Using Land Use/Land Cover and Statistical Data," Sustainability, MDPI, Open Access Journal, vol. 7(1), pages 1-27, December.
    2. repec:eee:ecomod:v:252:y:2013:i:c:p:280-287 is not listed on IDEAS
    3. repec:eee:ecomod:v:252:y:2013:i:c:p:63-71 is not listed on IDEAS
    4. repec:eee:ecolec:v:156:y:2019:i:c:p:196-201 is not listed on IDEAS
    5. repec:eee:ecomod:v:252:y:2013:i:c:p:83-96 is not listed on IDEAS
    6. repec:eee:ecomod:v:271:y:2014:i:c:p:90-102 is not listed on IDEAS


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