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Eco-efficiency analysis of non-potable water systems in domestic buildings

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  • Lam, Chor-Man
  • Leng, Ling
  • Chen, Pi-Cheng
  • Lee, Po-Heng
  • Hsu, Shu-Chien

Abstract

Energy efficiency in water systems contributes significantly towards achieving sustainable water management. Decentralized anaerobic fluidized bed membrane bioreactor (AFMBR) systems with energy recovery have been proposed for greywater recycling in domestic buildings for non-potable uses, such as toilet flushing. This study developed an eco-efficiency analysis (EEA) framework with the integration of life-cycle assessment (LCA) and economic analysis for the evaluation of different water systems. Four water management scenarios including (1) freshwater flushing system, (2) seawater flushing system, (3) greywater flushing system adopting aerobic membrane bioreactor (MBR), and (4) greywater flushing system adopting AFMBR, were analyzed in a case study in Hong Kong. The EEA results reveal the AFMBR greywater reuse scenario to be the most eco-efficient option as the system is capable of energy recovery, recycling of water resource and reduction of sewage treatment loadings. This study has demonstrated that the EEA framework is an effective tool to guide water management towards sustainability and provides a basis for further research on the application of greywater recycling systems on a larger scale.

Suggested Citation

  • Lam, Chor-Man & Leng, Ling & Chen, Pi-Cheng & Lee, Po-Heng & Hsu, Shu-Chien, 2017. "Eco-efficiency analysis of non-potable water systems in domestic buildings," Applied Energy, Elsevier, vol. 202(C), pages 293-307.
    • Handle: RePEc:eee:appene:v:202:y:2017:i:c:p:293-307
    DOI: 10.1016/j.apenergy.2017.05.095
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    2. Nancy Diaz-Elsayed & Jiayi Hua & Nader Rezaei & Qiong Zhang, 2023. "A Decision Framework for Designing Sustainable Wastewater-Based Resource Recovery Schemes," Sustainability, MDPI, vol. 15(4), pages 1-27, February.
    3. Muhanji, Steffi O. & Farid, Amro M., 2020. "An enterprise control methodology for the techno-economic assessment of the energy water nexus," Applied Energy, Elsevier, vol. 260(C).
    4. Chen, Pi-Cheng & Alvarado, Valeria & Hsu, Shu-Chien, 2018. "Water energy nexus in city and hinterlands: Multi-regional physical input-output analysis for Hong Kong and South China," Applied Energy, Elsevier, vol. 225(C), pages 986-997.
    5. Hugo Sakamoto & Flávia M. Ronquim & Marcelo Martins Seckler & Luiz Kulay, 2019. "Environmental Performance of Effluent Conditioning Systems for Reuse in Oil Refining Plants: A Case Study in Brazil," Energies, MDPI, vol. 12(2), pages 1-14, January.

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