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2.3.
Iron removal filters FFD
Iron removal filters series FFD are used for water treatment for residential and industrial
applications as well. All the materials, media filter included, are food grade and approved for
drinking water. The range of models includes systems with capacity from 4.0 up to 40.0 m³/h.
Iron removing is the process of filtration that allows to remove iron and manganese from
water. This special filtration is made through a special catalytic media filter, (activated
pyrolusite, briefly successively named PL, mixed with quartz-sand) which action is to oxide and
then filter the dissolved iron and manganese.
The media filter is kept in its activated state by mean of an oxiding agent, oxigen or
hypochlorite, contained in water.
As a general rule, the continuous addiction of sodium hypochlorite in water, upstream of the
filter, is used; this system is more reliable and effective than the forced oxygenation.
Under the same conditions of the filtering bed, the filtration action increases when the linear
flow (speed of water trough the media) decreases, hence at a lower flow rates.
The slower is the linear flow, the better is the filtration action.
During the process, as the filtering bed traps the suspended particles, as filtration action
increases, since the trapped solids works the same way of a filtering bed !
But it also increases the resistance of the filtering bed against the water flow; so the pressure
drop between inlet and outlet increases as well.
The maximum allowed pressure drop is 1 bar (100 kPa), afterthat it is required to backwash
the filtering bed.
The purpose of the backwashing is to re-built the filtering bed efficiency, by removing the
solids trapped during service; it is featured by a counter-flow of water through the filtering bed.
The programmer allows to set the regeneration at the scheduled days and time; for DP and
DP-DUAL models, regeneration can also be set to start when the max allowable value of
pressure drop is reached.
For the best working of the filter, the backwashing must be featured before the pressure drop
reaches the threshold level (1 bar - 100 kPa).
During regeneration the water supplying is completely inhibited by means of a membrane
valve mounted on the outlet line.
3.
TECHNICAL CHARACTERISTICS
3.1.
Assumed raw water characteristics
• water temperature (min÷max)
• water pressure (min÷max)
3.2.
Technical characteristics (general)
• power supply
• regeneration time
• ∆p min/max
s.r.l.Milano - ITALY
INSTRUCTIONS MANUAL AUTOMATIC FILTERS
ºC (ºF)
5÷40 (41÷104)
bar (kPa)
1.5÷8.0 (150÷800)
V ph/Hz W
110÷240 1/50÷60 30
min.
20÷30
bar (kPa)
0.2÷1.0 (20÷100)
Page 5 of 23
FCD-FACD-FFD /DT /DP /DT-DUAL /DP-DUAL
fcd-dp_mi-r4.doc –
r.4
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