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Comparative Life Cycle Water Use Assessment of Diverse Hydrogen Production Pathways.

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Low-carbon hydrogen production is key for a net-zero economy. Life cycle water use varies by method, with wind-powered electrolysis and dry cooling offering the lowest consumption.

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Area of Science:

  • Environmental Science
  • Chemical Engineering
  • Energy Policy

Background:

  • Hydrogen is a crucial energy carrier for decarbonizing hard-to-abate industries during the transition to a net-zero economy.
  • Low-carbon hydrogen can be produced via electrolysis using renewable electricity or reforming/gasification with carbon capture using fossil fuels.
  • Water consumption is a critical factor in assessing the sustainability of hydrogen production pathways.

Purpose of the Study:

  • To comparatively evaluate the life cycle water use of various hydrogen production pathways.
  • To identify key factors influencing water consumption, including feedstock, technology, energy source, cooling, and location.
  • To determine the most water-efficient hydrogen production methods for a net-zero future.

Main Methods:

  • Life cycle assessment (LCA) framework applied to diverse hydrogen production routes.
  • Analysis of water use across different stages: plant operation, electricity generation, and resource extraction.
  • Comparative evaluation of electrolysis versus reforming/gasification with carbon capture.

Main Results:

  • Hydrogen plant operation and electricity supply are the dominant contributors to life cycle water use.
  • The water footprint of electrolysis is competitive with carbon capture methods, heavily dependent on the electricity source.
  • Wind-powered electrolysis integrated with dry cooling demonstrates the lowest life cycle water consumption.

Conclusions:

  • Optimizing hydrogen production requires careful consideration of water resources, especially concerning electricity source and cooling technology.
  • Dry cooling and alternative water sources are vital for minimizing freshwater use in hydrogen production.
  • Integrated management of hydrogen, water, and electricity resources is essential for achieving sustainability.