Full Installation Service on all equipment
Iron & Manganese Reduction
When rain falls, the water has a naturally aggressive, slightly acidic nature. This water then dissolves chalk and / or
metallic deposits present in the local rock strata, resulting in ground and borehole water containing elements that
would not normally be present in mains water.
Contaminants such as Iron and Manganese can cause problems
such as poor tasting (and potentially harmful) drinking water & staining of appliances and equipment.
Iron Reducion before and after
Media
Iron and Manganese can be removed from water by using media which encourages
reaction between the contaminant and oxygen present in the water. This reaction
forms an insoluble precipitate which can then be filtered out by the media bed.
The
media acts “catalytically”, which means that although it triggers the reaction it is not
used up as part of the process, thus giving long life from a single filter. A choice of
media are available, Pyrolox, Filox & Birm. All are based on Manganese Dioxide but
with Pyrolox and Filox haveing more active sites.
In order to remove accumulated deposits from the filter bed, the water flow through
the filter is reversed (backwashed). Water is run to drain at a high flow rate to seperate
the deposits from the filter media. The control valve completes the backwash cycle
automatically at the intervals and times set during the installation.
The Water Analysis & Filtration System Specification
A water analysis should always be the
starting point for the specification of an Iron
and Manganese removal system. A filtration
system can then be tailor made to suit the
individual water chemistry. This often involves
the use of one or more of the filters shown on
the diagram on the right. These can help the
main catalytic filter achieve the desired
results.
Contact Assembly
Multi Media Filter
pH Correction
Contact assemblies are designed
to aerate water. Air is drawn in
using a Mazzei injector which then
mixes inside the vessel, This helps
by initiating the oxidation of Iron
and Manganese. Precipitation
starts to occur which can then be
removed using a multi media filter,
before the water reaches the main
catalytic filter.
Physical filters can be used to
remove precipitated Iron and
Manganese once passed through
a contact assembly. A multi media
filter consists of a graduated bed
of gravel, sand and anthracite.
Filtering down to 5 microns, the
backwash valve ensures that the
sediment is washed away, thus
increasing the life of the catalytic
media.
Catalytic media work at their
optimum efficiency at higher pH
levels. A pH system can therefore
be used when the water is acidic
and / or the water chemistry is
considered unfavourable for Iron
and Manganese removal. pH
correction media is the only media
which get “used up” during the
process.
Pyrolox Sizing Table
Triplex Filters
At waterdriller we offer a triplex filter consists of two vessels. The first one is a contact
assembly. The second consists of a blend of pH correcting
media, and Iron and Manganese removal media and a
physical filter media.
This works in three ways and has the
combined effect of raising the pH of the water, precipitating
any dissolved Iron and Manganese and finally filtering out this
precipitate.
The triplex filtration system is best used on water
where the Iron and Manganese levels aren’t excessively high
and the ratio between Iron and Manganese is at least 5:1.
The Contact Assembly
Contact assemblies are designed to aerate the water and allow
a contact time for the air to react with elements of the water.
The air is drawn into the vessel by a Mazzei injector. This is
designed so that when water passed through the device, a
vacuum is created at the tee piece which results in air being
sucked into the water flow.
A deflector piece in the head then
causes the water to swirl as it enters the vessel, thus mixing air
with the water. The oxygen in the air can then initiate the
oxidation of dissolved Iron and Manganese to produce solid
oxides. These are generally used when the ratio between Iron &
Manganese is less than 10:1.
On all but the smallest contact assembly, a “bypass leg” is
included in the system. This contains a spring loaded valve which
opens up at higher flow rates and therefore pressure. The idea of
this is to allow water to bypass the small orifice of the injector
when a filter ahead of the contact assembly goes into
backwash and therefore requires a higher volume of water than
in service.
Contact assemblies can also be used to oxidise
Triplex Sizing Table
Please contact us for pricing and installation costs
