Contribution of Wetlands to the Food-Water-Energy Nexus

2018 ◽  
pp. 901-906
Author(s):  
Mark Everard
Keyword(s):  
Water Energy Nexus

Low-Resistance Monovalent-Selective Cation Exchange Membranes for Energy-Efficient Ion Separations

2020 ◽  
Author(s):  
Eyal Wormser ◽  
Oded Nir ◽  
Eran Edri
Keyword(s):  
Cation Exchange ◽  
Brackish Water ◽  
Molecular Layer ◽  
Water Desalination ◽  
Molecular Layer Deposition ◽  
Selective Layer ◽  
Trade Off ◽  
Membrane Selectivity ◽  
Layer Deposition ◽  
Water Energy Nexus

<div> <div> <div> <p>The desalination of brackish water provides water to tens of millions of people around the world, but current technologies deplete much needed nutrients from the water, which is detrimental to both public health and agriculture. A selective method for brackish water desalination, which retains the needed nutrients, is electrodialysis (ED) using monovalent-selective cation exchange membranes (MVS-CEMs). However, due to the trade-off between membrane selectivity and resistance, most MVS-CEMs demonstrate either high transport resistance or low selectivity, which increase energy consumption and hinder the use of such membranes for brackish water desalination by ED. Here, we used molecular layer deposition (MLD) to uniformly coat CEMs with ultrathin layers of alucone. The positive surface charge of the alucone instills monovalent selectivity in the CEM. Using MLD enabled us to precisely control and minimize the selective layer thickness, while the flexibility and nanoporosity of the alucone prevent cracking and delamination. Under conditions simulating brackish water desalination, this compound provides monovalent selectivity with negligible added resistance—the smallest reported resistance for a monovalent-selective layer, to date—thereby alleviating the selectivity–resistance trade-off. Addressing the water–energy nexus, we show that using these membranes in ED will cut at least half of the energy required for selective brackish water desalination with current MVS-CEMs. </p> </div> </div> </div>

Electrochemical Redox Cells Capable of Desalination and Energy Storage: Addressing Challenges of the Water–Energy Nexus

2021 ◽  
Vol 6 (3) ◽  
pp. 1034-1044 ◽  
Author(s):  
Do-Hwan Nam ◽  
Margaret A. Lumley ◽  
Kyoung-Shin Choi
Keyword(s):  
Energy Storage ◽  
Water Energy Nexus ◽  
Electrochemical Redox

Sustainable Energy Transition Considering the Water–Energy Nexus: A Multiobjective Optimization Framework

2021 ◽  
Vol 9 (10) ◽  
pp. 3768-3780
Author(s):  
Javier Tovar-Facio ◽  
Lidia S. Guerras ◽  
José M. Ponce-Ortega ◽  
Mariano Martín
Keyword(s):  
Multiobjective Optimization ◽  
Sustainable Energy ◽  
Energy Transition ◽  
Optimization Framework ◽  
Water Energy Nexus

scholarly journals Causal Relations of Upscaled Urban Aquaponics and the Food-Water-Energy Nexus—A Berlin Case Study

Water ◽  
2021 ◽  
Vol 13 (15) ◽  
pp. 2029
Author(s):  
Gösta F.M. Baganz ◽  
Manfred Schrenk ◽  
Oliver Körner ◽  
Daniela Baganz ◽  
Karel J. Keesman ◽  
...  
Keyword(s):  
Urban Areas ◽  
Causal Link ◽  
Supply Side ◽  
Demand Side ◽  
Annual Fish ◽  
Causal Relations ◽  
Water Energy Nexus ◽  
Facility Level ◽  
Predominant Effect

Aquaponics, the water-reusing production of fish and crops, is taken as an example to investigate the consequences of upscaling a nature-based solution in a circular city. We developed an upscaled-aquaponic scenario for the German metropolis of Berlin, analysed the impacts, and studied the system dynamics. To meet the annual fish, tomato, and lettuce demand of Berlin’s 3.77 million residents would require approximately 370 aquaponic facilities covering a total area of 224 hectares and the use of different combinations of fish and crops: catfish/tomato (56%), catfish/lettuce (13%), and tilapia/tomato (31%). As a predominant effect, in terms of water, aquaponic production would save about 2.0 million m3 of water compared to the baseline. On the supply-side, we identified significant causal link chains concerning the Food-Water-Energy nexus at the aquaponic facility level as well as causal relations of a production relocation to Berlin. On the demand-side, a ‘freshwater pescatarian diet’ is discussed. The new and comprehensive findings at different system levels require further investigations on this topic. Upscaled aquaponics can produce a relevant contribution to Berlin’s sustainability and to implement it, research is needed to find suitable sites for local aquaponics in Berlin, possibly inside buildings, on urban roofscape, or in peri-urban areas.

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