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Potential for electricity savings by reducing potable water consumption in a city scale

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  • Proença, Lúcio Costa
  • Ghisi, Enedir
  • Tavares, Davi da Fonseca
  • Coelho, Gabriel Marcon

Abstract

Nowadays, it is very important that water and energy resources are used appropriately as this is a challenge to promote sustainable development. In some sectors, such as water and sewerage utilities, energy consumption depends on water consumption. The main objective of this work is to estimate the potential for electricity savings in a water and sewerage utility by reducing potable water consumption in the residential, commercial and public sectors in the city of Florianópolis, southern Brazil. These three sectors account for 98.9% of the total water consumption in the city. By using data related to energy consumption and costs that apply to the local water utility for water and sewage treatment, and also the potential for potable water savings over the three sectors, it is possible to estimate the potential for energy savings by reducing potable water consumption and sewage treatment. Potable water savings were estimated by using data available in the literature about water end-uses for different types of buildings located in Florianópolis. Three options were considered: installing dual-flush toilets, reusing greywater and using rainwater. The average potential for potable water savings were 30.0%, 53.4% and 60.3%, respectively, for the residential, commercial and public sectors. Thus, the average potable water savings amount to about 10,153,835m3/year, and the electricity savings amount to 4.4GWh/year, which would be enough to supply 1217 houses or flats in Florianópolis, with an average energy consumption of 300kWh/month.

Suggested Citation

  • Proença, Lúcio Costa & Ghisi, Enedir & Tavares, Davi da Fonseca & Coelho, Gabriel Marcon, 2011. "Potential for electricity savings by reducing potable water consumption in a city scale," Resources, Conservation & Recycling, Elsevier, vol. 55(11), pages 960-965.
    • Handle: RePEc:eee:recore:v:55:y:2011:i:11:p:960-965
    DOI: 10.1016/j.resconrec.2011.05.003
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    References listed on IDEAS

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