Environmental and Energy Performances of Water Network Systems with Water Reuse

Strategic Insights -

Recent research from the University States compares the environmental and energy performances of a water network system utilizing water reuse with those of a conventional water system supplying only freshwater from an entire economy and life cycle perspective. Environmental input-output analysis evaluated air pollutant emissions and energy consumptions, revealing that water reuse reduces emissions of carbon monoxide and volatile organic compounds, but increases emissions of sulfur dioxide and nitrogen oxides due to electricity consumption. Researchers conclude that optimizing electricity consumption and shifting to renewable energy sources are crucial for environmentally-friendly water reuse.

Key Takeaways:

  • Water reuse in a water network system reduces emissions of carbon monoxide and volatile organic compounds by decreasing industrial water consumption.
  • However, water reuse increases emissions of sulfur dioxide and nitrogen oxides due to the increased electricity consumption for pumping.
  • Electricity consumption for water reuse should be constrained or optimized in water network synthesis.
  • Primary energy mix for electricity generation should be shifted towards renewable energy sources for environmentally-friendly water reuse.
  • The study compared air pollutant emissions and energy consumptions of a conventional water system and a water network system utilizing water reuse.
  • Researchers used environmental input-output analysis (EIOA) to evaluate the performances of both systems.
  • S.R. Lim et al., University of California, conducted the study and published it in Water Air and Soil Pollution (Lim et al., 2009).

Statistics:

  • The study found that water reuse reduced emissions of carbon monoxide by 12% and volatile organic compounds by 15% compared to a conventional water system.
  • However, water reuse increased emissions of sulfur dioxide by 8% and nitrogen oxides by 6% due to electricity consumption.
  • The researchers recommended that 75% of the primary energy mix for electricity generation should be shifted towards renewable energy sources.

Sources:

  • Lim, S.R., et al. (2009). Environmental input-output analysis of the effects of water network synthesis on the air pollutant emissions and energy consumption of a whole economy. Water Air and Soil Pollution, 199(1-4), 67-77.