NOVEMBER 2017 WET NEWS 13
oen microbiological growth
can proliferate. Amiad's pat-
ented inlet design incorporates
a vortex generating system.
This ensures the vortex effect
is maintained throughout the
upper part of the filter vessel,
ensuring balanced dynamics
within the whole top section of
the vessels without causing a
quiet zone. Also, the vortex
generating nozzles have large
orifices so no blockage is pos-
sible whilst an active regener-
ating filter bed is still main-
tained. By designing an inlet
which allows a vortex to be
developed even at minimal
flows we have also effectively
eliminated the previous issue
relating to minimum flow
requirement of technologies
with vortex generating inlet
designs.
Sand media is a traditional
material for media filters and
has good filtration properties
the filter media that we use is
activated glass as this resists
microbiological fouling.
Because the structure of sand
is irregular with rough surfaces
such media can act as a sub-
strate for microbiological
growth. This is proliferated in
The Double
Vortex Filter is
not a standard
media filter
THE CONCEPT
• The DVF allows lighter contaminates to be retained in a vortex
which operates above the filter bed surface
• The vortex effect is maintained throughout the upper part of the
filter vessel
• The vortex generating nozzles have large orifices so no blockage is
possible
NEED TO KNOW
1
operation of the DVF at a flux rate of 40m3/m2 had no impact on
filter performance
2
Activated glass resists microbiological fouling
3
Creating a vortex above the filter bed can have its own issues – a
quiet zone is created where microbiological growth can proliferate
a sand bed can reduce the per-
formance and limit the life of
the filter bed oen requiring
sanitation nor even complete
replacement. Glass has a much
smoother spherical surface,
and in some cases can be man-
ufactured with a surface
charge that attracts fine partic-
ulate. Overall glass delivers
better performance and longer
bed life and is thus less sus-
ceptible to biofouling. All the
advantages of a traditional
sand filter design are incorpo-
rated in terms of the bed
height so optimum perfor-
mance can be achieved. The
inlet system allows very fine
media to be incorporated so
the optimum of performance
can be achieved repeatedly.
In summary, by using a
time-honoured process of
microscopic particle filtration
using the traditions of sand
and combining this with the
advancement of modern tech-
nology Amiad has proven not
only the benefits of using a
quality media but also the way
in which it can be used can be
qualified to clients in terms of
cost savings, quality and
efficiency.
THE VERDICT
• The DVF was an effective 1 micron filter with efficiency ranges of
removal at 1 micron of up to 80% being viable
• Smaller footprints were possible for comparative flow of
conventional media filters
t. 0800 8046 062 www.atiuk.com
Continuous water quality monitors
for distribution networks
Your Global Automation Partner
Process Monitoring
Flow - Temp - Pressure - Level
www.turckbanner.co.uk
Turck Banner Ltd.
Blenheim House, Blenheim Court, Wickford,
Essex. SS11 8YT Tel: 01268 578888
sensors@turckbanner.co.uk
