GE Water Provides Portfolio of Nanotech Membrane-Based Solutions - Aquananotechnology: Global Prospects - page 814

(a) (b)

(i)

V

Gravity-fed
seawater

External
pressure

V

Desalted

V V

GND

Nanochannel

Repulsion
zone

GND

SG desalter

GND

GND

V V

Microchannels

(ii)

V

Any charged
species

Concentrate Fresh

Desalted
water

V+
pressure

Seawater

V

Ion-depletion
boundary

∆V

Nanojunction

GND GND

FIGURE 27.13
(a) Small-scale setup for concentration polarization desalination. (From Shannon, M.A., Nature Nanotechnology ,
5, 248, 2010.) (b) Schematic of microchannel-nanochannel prototype tested for water desalination using concen-
tration polarization. (From Kim, S.J., S.H. Ko, K.H. Kang, and J. Han, Nature Nanotechnology , 5, 297, 2010.)