Scenario analysis of energy and water trade-offs in the expansion of a dual water system

Zachary A. Barker, Ashlynn S. Stillwell, Emily Z. Berglund

Research output: Research - peer-reviewArticle

Abstract

Using treated wastewater effluent (reclaimed water) for beneficial purposes can be a sustainable practice that reduces demand on potable networks. However, implementing reclaimed water networks can have unintended effects, specifically unintended increases in energy consumption. This case study employs multiperiod scenario analysis to examine energy consumption associated with the potable and reclaimed water systems for the Town of Cary, North Carolina. Using hydraulic planning models of both systems provided by the design engineers, the conveyance and additional treatment energy is tabulated. This method considers uncertainty in reclaimed water demand by varying the expected demand for each build out of the reclaimed water network. Differential electricity consumption is calculated as the difference between the electricity consumed to deliver reclaimed water through a secondary network compared to the electricity consumed to deliver the same volume through the potable water network. Demand uncertainty, in conjunction with spatial growth, is found to have large impacts on differential electricity consumption. Because of the high quality of wastewater effluent, no additional energy is required for treatment, causing the reclaimed water network to consume less energy than the business-as-usual scenario, where the demands are supplied via the potable network. The differential electricity consumption decreases with network expansion because the reclaimed water system becomes less energy efficient per unit volume with increasing flow rate, while the potable water system energy efficiency remains fairly constant. Understanding the trade-offs between water and energy when planning reclaimed water networks is important for sustainable resource management within the built environment.

LanguageEnglish (US)
Article number05016012
JournalJournal of Water Resources Planning and Management
Volume142
Issue number12
DOIs
StatePublished - Dec 1 2016

Fingerprint

energy
water
scenario analysis
Water
Electricity
demand
electricity consumption
electricity
drinking water
effluent
wastewater
energy consumption
Potable water
Energy utilization
Planning
Uncertainty
energy planning
water demand
energy efficiency
resource management

Keywords

  • Energy
  • Landscape irrigation
  • Reclaimed water
  • Sustainability

ASJC Scopus subject areas

  • Geography, Planning and Development
  • Civil and Structural Engineering
  • Water Science and Technology
  • Management, Monitoring, Policy and Law

Cite this

Scenario analysis of energy and water trade-offs in the expansion of a dual water system. / Barker, Zachary A.; Stillwell, Ashlynn S.; Berglund, Emily Z.

In: Journal of Water Resources Planning and Management, Vol. 142, No. 12, 05016012, 01.12.2016.

Research output: Research - peer-reviewArticle

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