DynaSand0 pages

Water & Wastewater
DynaSand® Filter
Continuous Up flow Sand Filtration
Cost-effective, Continuous Filtration with Internal Washing System
DynaSand® is a continuously operating sand filter
with an internal washing system which eliminates
the need for wash water storage tanks, backwash
pumps and collecting tanks.
Applications
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Drinking water treatment.
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Industrial effluent treatment and water supply.
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Recovery and reuse of water.
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Treatment of wastewater before discharge.
Advantages
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No first filtrate. Always clean effluent.
No shock loads on the wash water treatment system.
Handles high suspended solids without the need for
pretreatment.
Low head loss.
Low energy consumption.
Low supervision and maintenance costs.
No need for backwash pumps, wash water storage or wash
water collecting tanks.
No automatic valves or air scour blower.
No clogging filter bottom nozzles.
Single media filter bed.
Available as a freestanding unit or as filter modules for
installation into a concrete basin.
How it Works
The water to be treated (red arrow) is admitted through the
inlet distributor (1) in the lower section of the unit and is
cleaned as it flows upwards through the sand bed, prior to
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discharge (blue arrow) through the filtrate outlet (2) at the
top. The sand containing the entrapped solids is conveyed
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from the tapered bottom section of the unit (3), by means of
an airlift pump (4), to the sand washer (5) at the top.
Filtered Water Zone
The DynaSand® filter is based on the counter flow principle.
Cleaning of the sand commences in the pump itself where
impurities are separated from the sand grains by the
Sand Bed Zone
turbulent mixing action. The contaminated sand spills from
the pump outlet into the washer labyrinth (6) in which it is
washed by a small counter current flow of clean water. The
separated solids (brown arrow) are discharged through the
wash water outlet (7), while the grains of clean sand (which
are heavier) are returned to the sand bed (8). As a result,
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the bed is in slow, constant downward motion through the
Entrapped Solids Zone
unit. Compressed air for the sand pump is provided by via
the control panel.
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Thus, water purification and sand washing both take place
continuously enabling the filter to remain in service without
interruption.
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turning water around ...®
Tel: 01353 645700 • Fax: 01353 645702 • www.hydro-international.biz