Energy Recovery from Solutions with Different Salinities Based on Swelling and Shrinking of Hydrogels
KAUST Grant NumberKUS-I1-003-13
MetadataShow full item record
AbstractSeveral technologies, including pressure-retarded osmosis (PRO), reverse electrodialysis (RED), and capacitive mixing (CapMix), are being developed to recover energy from salinity gradients. Here, we present a new approach to capture salinity gradient energy based on the expansion and contraction properties of poly(acrylic acid) hydrogels. These materials swell in fresh water and shrink in salt water, and thus the expansion can be used to capture energy through mechanical processes. In tests with 0.36 g of hydrogel particles 300 to 600 μm in diameter, 124 mJ of energy was recovered in 1 h (salinity ratio of 100, external load of 210 g, water flow rate of 1 mL/min). Although these energy recovery rates were relatively lower than those typically obtained using PRO, RED, or CapMix, the costs of hydrogels are much lower than those of membranes used in PRO and RED. In addition, fouling might be more easily controlled as the particles can be easily removed from the reactor for cleaning. Further development of the technology and testing of a wider range of conditions should lead to improved energy recoveries and performance. © 2014 American Chemical Society.
CitationZhu X, Yang W, Hatzell MC, Logan BE (2014) Energy Recovery from Solutions with Different Salinities Based on Swelling and Shrinking of Hydrogels. Environ Sci Technol 48: 7157–7163. Available: http://dx.doi.org/10.1021/es500909q.
SponsorsWe thank Weihua He for help with hydrogel preparation. This research was supported by Award KUS-I1-003-13 from the King Abdullah University of Science and Technology (KAUST).
PublisherAmerican Chemical Society (ACS)
CollectionsPublications Acknowledging KAUST Support
- Salinity Gradient Energy from Expansion and Contraction of Poly(allylamine hydrochloride) Hydrogels.
- Authors: Bui TQ, Cao VD, Do NBD, Christoffersen TE, Wang W, Kjøniksen AL
- Issue date: 2018 Jul 5
- Salinity Gradients for Sustainable Energy: Primer, Progress, and Prospects.
- Authors: Yip NY, Brogioli D, Hamelers HV, Nijmeijer K
- Issue date: 2016 Nov 15
- Comparison of energy efficiency and power density in pressure retarded osmosis and reverse electrodialysis.
- Authors: Yip NY, Elimelech M
- Issue date: 2014 Sep 16
- Thermodynamic, energy efficiency, and power density analysis of reverse electrodialysis power generation with natural salinity gradients.
- Authors: Yip NY, Vermaas DA, Nijmeijer K, Elimelech M
- Issue date: 2014 May 6
- Thin-film composite pressure retarded osmosis membranes for sustainable power generation from salinity gradients.
- Authors: Yip NY, Tiraferri A, Phillip WA, Schiffman JD, Hoover LA, Kim YC, Elimelech M
- Issue date: 2011 May 15