E2.03 Criddle 2014 ReNUWIt Annual Meeting Poster

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Abstract/Contents

Abstract: Energy can be extracted from the salinity gradient between freshwater and seawater. In coastal wastewater treatment plants, where the treated wastewater discharges into the ocean directly, salinity-gradient power can be recovered to power the treatment plant. Calculations indicate that the extractable salinity-gradient energy of 0.6 kWh per cubic meter of treated water is roughly equal to the energy consumption of a typical wastewater treatment plant. We investigated the energy recovery from real wastewater effluent and seawater using a novel membrane-less technology called “mixing entropy battery”. In order to reduce the internal resistance, we fabricated a plate-shape cell with the dimensions of 3 cm x 3 cm and the distance between the electrodes is ~1.7 mm. We achieved a high voltage efficiency of ~85% and energy production of ~0.56 J in one six-hour cycle under 250 μA. An overall efficiency of ~70% is obtained by connecting twelve cells in series.

Type of resource	other
Date created	May 2014

Subject	Re-inventing the Nation’s Urban Water Infrastructure
Subject	ReNUWIt
Subject	E2.03
Subject	Efficient Engineered Systems
Subject	Energy and resource recovery
Subject	Palo Alto
Subject	California
Subject	desalination
Subject	electrodes
Subject	electrodialysis
Subject	extraction
Subject	membrane contactors
Subject	power production
Subject	pressure retarded osmosis
Subject	river water
Subject	salt

Related Publication	Ye, M., Pasta, M., Xie, X., Cui, Y., & Criddle, C. S. (2014). Performance of a mixing entropy battery alternately flushed with wastewater effluent and seawater for recovery of salinity-gradient energy. Energy & Environmental Science, 7(7), 2295-2300. http://doi.org/10.1039/c4ee01034e
Location	https://purl.stanford.edu/xs329fg1675

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Preferred Citation: Criddle, Craig S. and Cui, Yi and Ye, Meng and Xie, Xeng and Pasta, Mauro . (2014). E2.03 Criddle 2014 ReNUWIt Annual Meeting Poster. Stanford Digital Repository. Available at: https://purl.stanford.edu/xs329fg1675

Re-inventing the Nation's Urban Water Infrastructure (ReNUWIt)

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