Filter press
KS 94 application
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Description
Chamber filter presses and membrane
filter presses are used to dewatering
sludgy effluents, for example from
foundries, metalworking plants, and
sewage plants. Digesters, for instance,
work according to the displacement
principle, whereby old sludge is replaced
by fresh sludge from the holding tank;
the holding tank acts as a sludge buffer.
The sludge only contains some 2 to 6 %
of solids, which are separated from the
liquid phase by adding flocculants. In
most production sites, stationary plants
are used to treat the waste water and
remove as many solids as possible.
Mobile installations are also used, mainly
in refuse tips and landfills, and operated
by commercial service enterprises.
Large volumes of waste mean high handling
and treatment cost, so that efficient
sludge dewatering can lead to considerable
savings. In the long term, this can
even justify the installation of a stationary
plant or paying for the services of a
commercial operator.
There still are very many mobile
installations that are fitted with ancient
control equipment and, as a
consequence, a high risk of failure, quite
apart from low efficiency.
With PMA’s solution, BCD switches are
used to select the set-points for pressure
indicators and pressure monitors. These
provide pulsed output signals that are
changed into a continuous signal by a
D/A converter before being connected to
a PD controller.
Furthermore, a KS 94 controller is used,
an extremely versatile device that offers
high operating convenience. All of the
above features are provided by a single
piece of equipment.
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detailed Documentation |
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