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Emergy evaluation of an integrated livestock wastewater treatment system

Author

Listed:
  • Zhang, XiaoHong
  • Wei, Ye
  • Li, Min
  • Deng, ShiHuai
  • Wu, Jun
  • Zhang, YanZong
  • Xiao, Hong

Abstract

Wastewater treatment practices should pay more attention to their environmental performances due to their resources consumption and emissions’ impact. While reclaimed water reuse seems to have become a promising practice, is it always feasible in any condition? To address this issue, this study carried out an extended emergy evaluation of a holistic wastewater treatment system. On one hand, this method was extended to include the emissions’ impact. On the other hand, this study integrated a wastewater treatment plant, its excess sludge disposal system and treated water disposal system into an integrated wastewater treatment system (IWTS), so as to evaluate its performances more completely. And then several indicators, including cost per unit pollutant eliminated (CUPE), ratio of positive output (RPO), environmental load ratio (ELR), and sustainability index (SI), were proposed for evaluating the performances of an IWTS. Two scenarios (scenario A: wastewater treatment+sludge landfilling+treated water discharges; scenario B: wastewater treatment+sludge landfilling+reclaimed water reuse) for a livestock wastewater treatment plant in Sichuan Agricultural University located in Ya’an City in Southwest China, as cases, were researched. The results show that scenario B has lower positive output efficiency and greater environmental load than scenario A. Meanwhile, the reclaimed water reuse raises cost per unit pollutant eliminated compared with the treated water being discharged directly; emissions’ impact enhances the environmental load of the two scenarios to different degree; emissions’ impact has decisive effect on the sustainability of the two scenarios. These results mean that the reclaimed water reuse should not be advocated in this case. This study provides some policy implications: (1) wastewater treatment process should be comprehensively evaluated from its resources consumption and impact of emissions; (2) reclaimed water reuse should be carefully evaluated from its pros and cons simultaneously; (3) the local conditions should be considered when implementing reclaimed water reuse, such as local water body conditions, market demands, the related laws and regulations, corporations’ economic conditions, etc.

Suggested Citation

  • Zhang, XiaoHong & Wei, Ye & Li, Min & Deng, ShiHuai & Wu, Jun & Zhang, YanZong & Xiao, Hong, 2014. "Emergy evaluation of an integrated livestock wastewater treatment system," Resources, Conservation & Recycling, Elsevier, vol. 92(C), pages 95-107.
  • Handle: RePEc:eee:recore:v:92:y:2014:i:c:p:95-107
    DOI: 10.1016/j.resconrec.2014.09.003
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    References listed on IDEAS

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