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Cosmic exergy based ecological assessment for a wetland in Beijing |
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| Authors: | ZM ChenB Chen GQ Chen |
| Institution: | a State Key Laboratory of Turbulence and Complex Systems, College of Engineering, Peking University, Beijing 100871, China b State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, No. 19, Xinjiekouwai Street, Beijing Normal University, Beijing 100875, China |
| Abstract: | 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. |
| Keywords: | Cosmic exergy Wetland ecosystem Ecological assessment Exergetic ecology |
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