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Novel water filtration of saline water in the outermost layer of mangrove roots

Title 
Novel water filtration of saline water in the outermost layer of mangrove roots
Authors 
Kim, Kiwoong; Seo, Eunseok; Chang, Suk-Kyu; Park, Tae Jung; Lee, Sang Joon
Issue Date 
2016-02-05
Abstract 
The scarcity of fresh water is a global challenge faced at present. Several desalination methods have been suggested to secure fresh water from sea water. However, conventional methods suffer from technical limitations, such as high power consumption, expensive operating costs, and limited system durability. In this study, we examined the feasibility of using halophytes as a novel technology of desalinating high-concentration saline water for long periods. This study investigated the biophysical characteristics of sea water filtration in the roots of the mangrove Rhizophora stylosa from a plant hydrodynamic point of view. R. stylosa can grow even in saline water, and the salt level in its roots is regulated within a certain threshold value through filtration. The root possesses a hierarchical, triple layered pore structure in the epidermis, and most Na+ ions are filtered at the first sublayer of the outermost layer. The high blockage of Na+ ions is attributed to the high surface zeta potential of the first layer. The second layer, which is composed of macroporous structures, also facilitates Na+ ion filtration. This study provides insights into the mechanism underlying water filtration through halophyte roots and serves as a basis for the development of a novel bio-inspired desalination method.
Keywords 
NANOFILTRATION MEMBRANE, SALT, TRANSPORT, SODIUM, PLANTS, SAP, INDICATORS, GENERATION, TOLERANCE, EXCLUSION
URI 
http://oasis.postech.ac.kr/handle/2014.oak/30015
DOI 
http://dx.doi.org/10.1038/srep20426
ISSN 
2045-2322
Article Type 
Article
Citation 
NATURE PUBLISHING GROUP
Appears in Collections
Mechanical Engineering (기계공학과) > 1. Journal Papers

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