A Conceptual Membrane Arrangement
Design In The High Pressure Vessel For
Seawater Desalination
Author(s)
A. Altaee
Abstract
The wide applications of Reverse Osmosis (RO) membranes in seawater
desalination and various industrial processes have encouraged researchers and
scientists to investigate the phenomena of water and salt diffusion through the
membrane. Typically, the high pressure RO membrane vessel is loaded with
membrane elements having the same flux and salt rejection rate. It has been
conceived that when different types of RO elements are loaded into the pressure
vessel in a special arrangement according to their permeability and salt rejection
rate, this arrangement has the potential for reducing the energy consumption of
the RO plant. A conceptual design is introduced here to describe this new idea.
The effects of feed salinity and temperature were investigated in this paper using
the ROSA Filmtec membrane design software. A two pass membrane treatment
process was designed for desalting seawater at different salinities varied from
35000 ppm to 43000 ppm. The results showed a net energy saving from 2.5% to
3% (depending on the feed salinity) could be achieved. The effect of the feed
temperature was also investigated and the new design was found to be more
energy efficient.
Keywords: water and salt permeability, RO, pressure vessel, energy
consumption.
1 Introduction
Reverse Osmosis (RO) seawater desalination is becoming a common trend for
fresh water supply in large and small cities. As water scarcity problems intensify
every day due to population growth and the degradation of freshwater quality,
SWRO plants were built around the world to provide potable water from
Keywords
water and salt permeability, RO, pressure vessel, energy
consumption
Related Book
Other papers in this volume
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