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Filtration systems are used everywhere in our society.
They are utilized to remove undesirable material from
our air and from solutions.
For the metal finishing industry, filtration is used
to remove un-dissolved solids from process baths and
wastewater. Filtration systems which incorporate activated
carbon, polypropylene or specialized clays, can absorb
organic compounds, oils, and some metallics.
In order to remove solids from a process solution,
some type of disposable or permanent filter media must
be used. This filter media must retard or prevent the
un-wanted material from passing through the filtration
unit and returning to the process tank. For more information
on filter media, please see the FILTER MEDIA section.
There are numerous filtration system designs available
on the market today. Units will utilize either a permanent
filter media or a disposable filter media. See table
1 for a few options available.
For some process baths, the continuous removal of
un-wanted material through filtration, is critical for
product quality. For example, chloride zinc process
baths can experience problems when the iron level in
the bath gets too high. Continuous iron treatments along
with filtration, will keep the iron level under control.
Selecting the size and style of the filtration system
for the application is critical to its’ success.
There are several factors to consider. A few are as
follows; the amount and type of contaminant to be removed,
volume of the process bath, chemistry, temperature,
and so on. For the final polishing of wastewater, the
flow rate must also be known.
In-tank filtration systems eliminate the possibility
of a spill or loss of process bath chemistry. There
are no hoses or plumbing that can rupture and leak on
the plant floor. The in-tank units are portable allowing
for additional filtration, or solution agitation in
virtually any tank.
Filtration systems designed to remove oils, particulate,
and sludge build-up, can be incorporated into your cleaning
operation. Cleaner life has been extended between dumps
saving downtime and money.
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