Membrane-based indirect power generation technologies for harvesting salinity gradient energy - A review

Jiao, Yanmei; Song, Linhui; Zhao, Cunlu; An, Yi; Lu, Wei-Yu; He, Bin; Yang, Chun

doi:10.1016/j.desal.2021.115485

Cited by 26 publications

(9 citation statements)

References 184 publications

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“…This initiated series of attempts to develop technologies, such as pressure retarded osmosis (PRO), reverse electrodialysis (RED), and single-pore osmotic generators (OPGs). They are being explored as a renewable hybrid process for recovering energy from highly saline brine (e.g., effluent from desalination or salt mining) and treated wastewater effluents 29 . Table 2 summarizes several recent SGE studies that explored the power generation potential of wastewater or brine from desalination or salt mining 29 .…”

Section: Anaerobic Bioreactorsmentioning

confidence: 99%

“…They are being explored as a renewable hybrid process for recovering energy from highly saline brine (e.g., effluent from desalination or salt mining) and treated wastewater effluents 29 . Table 2 summarizes several recent SGE studies that explored the power generation potential of wastewater or brine from desalination or salt mining 29 .…”

Section: Anaerobic Bioreactorsmentioning

confidence: 99%

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Pathways to a net-zero-carbon water sector through energy-extracting wastewater technologies

et al. 2022

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The energy-consuming and carbon-intensive wastewater treatment plants could become significant energy producers and recycled organic and metallic material generators, thereby contributing to broad sustainable development goals, the circular economy, and the water-energy-sanitation-food-carbon nexus. This review provides an overview of the waste(water)-based energy-extracting technologies, their engineering performance, techno-economic feasibility, and environmental benefits. Here, we propose four crucial strategies to achieve net-zero carbon along with energy sufficiency in the water sector, including (1) improvement in process energy efficiency; (2) maximizing on-site renewable capacities and biogas upgrading; (3) harvesting energy from treated effluent; (4) a new paradigm for decentralized water-energy supply units.

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Section: Anaerobic Bioreactorsmentioning

confidence: 99%

Section: Anaerobic Bioreactorsmentioning

confidence: 99%

Pathways to a net-zero-carbon water sector through energy-extracting wastewater technologies

et al. 2022

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“…Osmotic energy, also known as “blue energy”, is a renewable energy derived from the natural osmotic process that occurs when seawater and river water meet at a junction. − This promising technology has the potential to address the increasing global energy demand and environmental pollution crisis . Reverse electrodialysis (RED) directly generated electricity, − and ion-exchange membranes (IEMs) are a crucial component that separates seawater and river water while allowing counter-ions to pass through but blocking co-ions .…”

Section: Introductionmentioning

confidence: 99%

Enhanced Osmotic Energy Conversion through an Asymmetric Nanochannel Array Membrane with an Ultrathin Selective Layer

Yang,

Li,

Liu

et al. 2023

Chem. Mater.

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Osmotic energy, existing between sea water and river water, is a clean, renewable, and sustainable energy source that can be converted into electricity using ion-exchange membranes (IEMs) based on reverse electrodialysis. Asymmetric IEMs with thin selective layers have great potential in the osmotic energy conversion. However, there is still a tradeoff between ion selectivity and ion conductivity in the selective layer. Here, we demonstrate an up-scalable asymmetric nanochannel membrane with a crosslinked monomolecular selective layer that enhances osmotic energy conversion. A monomolecular layer of hyperbranched polyethyleneimine (h-PEI) is precisely grafted at the end of carboxylic nanochannels. The grafted h-PEI layer is fully expanded in the real aqueous condition, leading to unexpected permselectivity decrease. To avoid this, the h-PEI layer is in situ crosslinked with cyanuric chloride (CC), resulting in a dramatic decrease in thickness. The resultant asymmetric nanochannels with a crosslinked monomolecular h-PEI layer show increased Cl − permselectivity and conductivity, achieving enhanced osmotic energy conversion with a power density of 11.9 W/m 2 at a 500-fold salinity gradient, nearly twice as high as the pre-crosslinked membrane. The membrane design concept would pave the way for osmotic energy conversion and could be extended to other separation membranes.

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“…[ 4 ] Salinity gradient can also be easily constructed with hypersaline water and dilute water that can be obtained from industrial production, [ 5 ] desalination plants, etc. [ 6 ] To convert the Gibbs free energy to electricity in the process of mixing different salt solutions, several membrane‐separation processes, such as osmotic pressure method (PRO technology), [ 7 ] capacitive hybrid method, [ 8 ] and reverse electrodialysis (RED), [ 9 ] have been proposed. RED is relatively easy to implement by driving the ions across an alternating series of cation‐ and anion‐selective membranes.…”

Section: Introductionmentioning

confidence: 99%

Low‐Friction Graphene Oxide‐Based Ion Selective Membrane for High‐Efficiency Osmotic Energy Harvesting

Wang,

Chen

et al. 2023

Advanced Energy Materials

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Graphene‐based laminate membranes with selective ion‐transport capability show great potential in renewable osmotic energy harvesting. One of the great challenges is to reduce the overall energy barriers while remain the high ion selectivity in the transmembrane ion transport process. Here, a strategy is proposed to break the trade‐off between ion selectivity and permeability in laminar nanochannels using amphiphilic molecules as modifier, which enhances the surface charge density of nanochannel by loading more ion polymer with polar head and lows the frictional force of ion transport with hydrophobic tail. The conversion efficiency can reach to 32% in osmotic energy harvesting (0.5 m/0.01 m concentration gradient) after adopting this modifier. During the process of mixing real river water and seawater, the maximum power density can reach to 13.38 W m−2. The amphiphilic molecules also bind adjacent nanosheets, endowing the membrane's strong mechanical strength and high stability in aqueous solution. This work can open up a new way to regulate the transmembrane ion transport in 2D laminate membranes.

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Membrane-based indirect power generation technologies for harvesting salinity gradient energy - A review

Cited by 26 publications

References 184 publications

Pathways to a net-zero-carbon water sector through energy-extracting wastewater technologies

Pathways to a net-zero-carbon water sector through energy-extracting wastewater technologies

Enhanced Osmotic Energy Conversion through an Asymmetric Nanochannel Array Membrane with an Ultrathin Selective Layer

Low‐Friction Graphene Oxide‐Based Ion Selective Membrane for High‐Efficiency Osmotic Energy Harvesting

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