Sanghyun Jeong

Abstract To ascertain membrane distillation (MD) as an emerging desalination technology to meet the global water challenge, development of membranes with ideal material properties is crucial. Functionalized carbon nanotubes (CNTs) were anchored to nanofibres of electrospun membranes. Covalent modification and fluorination of CNTs improved their dispersibility and interfacial interaction with the polymer membrane, resulting in well-aligned CNTs inside crystalline fibres with superhydrophobicity. Consideration for the chemical/physical properties of the CNT composite membranes and calculation of their theoretical fluxes revealed the mechanism of MD: CNTs facilitated the repulsive force for Knudsen and molecular diffusions, reduced the boundary-layer effect in viscous flow, and assisted surface diffusion, allowing for fast vapor transport with anti-wetting. This study shows that the role of CNTs and an optimal composite ratio can be used to reduce the gap between theoretical and experimental approaches to desalination.

Membrane Distillation

10.1038/srep41562

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Citations (150)

Improvement of the thickening and dewatering characteristics of activated sludge by electroflotation (EF)

Water Science & Technology (2005)

Younggyun Choi H.S. Kim Y.H. Park Sanghyun Jeong Dong-Wook Son

The performances of electroflotation (EF) on the thickening of activated sludge were investigated using laboratory scale batch flotation reactors. Four activated sludges including bulking sludges were tested. After 30minutes of EF operation, 57–84% of sludge volume reduction could be achieved by EF, while only about 1.5–14% could be obtained by gravity thickening for the same period. After thickening the effluent water quality in terms of TCOD, SS, and turbidity was improved by EF operation for all sludge samples. In addition, the EF thickened sludge showed much better dewaterability both in SRF and cake solid content. It is induced that the air bubbles entrapped in the thickened sludge play a key role in the observed dewaterbility improvement.

Dewatering

Turbidity

Sludge bulking

10.2166/wst.2005.0697

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Citations (11)

Distribution of microplastics in rainfall and their control by a permeable pavement in low-impact development facility

Journal of Environmental Management (2023)

J. D. Kong Jieun Lee Sanghyun Jeong

First flush

10.1016/j.jenvman.2023.119710

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