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Magnetic Separation: Increasingly
strict discharge limits for wastewater have accelerated the research for effective
treatment technologies. It is now well known that mineral processing techniques can
provide solutions to the environmental problems. Magnetic separation method has been seen
in this regard as an alternative method for wastewater treatment. As matter of fact, it
has been well known that magnetic separation has been used for the removal of magnetic
solid particles from wastewater. Recent progress in this field is the removal of
non-magnetic water pollutants such as virus, algae and dissolved pollutants by magnetic
separation. Results of research done in the past ten years have shown that the magnetic
separation method can also be used for non-magnetic pollutants by seeding the wastewater
with magnetic seeds (e.g., magnetite) which preferentially adsorb or co precipitate the
material that is to be removed. In such applications, flocculants also may be added to
facilitate the agglomeration and removal of the pollutants. With the advantages of high
performance, cheapness, simplicity, compact process and workability at high flow rates,
the magnetic separation could be an alternative method for wastewater treatment. This
article describes the removal of non-magnetic water pollutants from wastewater by the
magnetic separation method with a combination of magnetic seeding technique by giving
examples of industrial applications in this field. |
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