Abstract
AbstractPervaporative irrigation is a membrane technology that can be used for desalination and subsurface irrigation simultaneously. To irrigate, the tube-shaped polymer membrane is buried in soil...
Highlights
Pervaporative irrigation is a promising subsurface irrigation technology that can be used to desalinate water as it is distributed through soil (Quinones-Bolanos and Zhou 2006; Sule et al 2013; Muthu and Brant 2015)
The large effect of soil osmotic potential observed here suggests that root exudates could be an important means for interaction between plants and pervaporative membranes in soil and should be investigated further. Previous work using this model (Todman et al 2013a) relied on parameter values fitted to data collected to measure the adsorption of water into a sand with an added osmotic compound
The method presented here allows these parameters to be estimated from literature values or independent measurements of the osmotic compounds out of the soil, and it is very effective
Summary
Pervaporative irrigation is a promising subsurface irrigation technology that can be used to desalinate water as it is distributed through soil (Quinones-Bolanos and Zhou 2006; Sule et al 2013; Muthu and Brant 2015). The technology consists of a semipermeable, nonporous, and hydrophilic polymer membrane, formed into a tube, across which water transport occurs by the process of pervaporation. If the surrounding soil is dry, a chemical potential gradient across the membrane draws water from inside the tube into the soil, while salt is retained in the tube (Quinones-Bolanos and Zhou 2006; Muthu and Brant 2015). Experiments with these membranes provide a rare opportunity to observe a subsurface flux of water vapor into soil without the addition of heat
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