DynaSand Oxy & DynaSand Deni0 pages

Water & Wastewater
DynaSand®Oxy
Ammonia Removal with Tertiary Filtration
Cost-effective, Continuous Filtration with Ammonia Removal
A continuous sand ltration system with air
addition to facilitate removal of ammonia from
wastewater.
Advantages
Continuous process as DynaSand® with the addition of
ammonia removal.
Ammonia, suspended solids and BOD removal in a single
stage.
Low ammonia consents achieved.
Peak inlet concentrations handled.
Efcient, easy operation.
Stand alone addition to the works.
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Applications
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Wastewater treatment works.
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Industrial efuent treatment.
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How it Works
The DynaSand®Oxy lter, like the DynaSand® lter, is based
Feed
Washer
Filtrate
2
on the counter ow principle. The water to be treated (red
lower section of the unit and is cleaned as it ows upwards
through the media bed, prior to discharge (blue arrow)
Filtered Water Zone
5
arrow) is admitted through the inlet distributor (1) in the
7
Wash Water
6
through the ltrate outlet (2) at the top.
To ensure that the autotrophic nitrifying bacteria have
sufcient oxygen and carbon dioxide to convert ammonia
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to nitrates, aeration hoods fed by process air (green arrow)
are sited within the upper layer of media to provide sufcient
aeration.
The resultant nitrates remain dissolved in the
water.
Air Lift Pump
Nitrication Zone
The media containing the entrapped solids is conveyed from
the tapered bottom section of the unit (3), by means of an
airlift pump (4), to the media washer (5) at the top.
Air
Cleaning of the media commences in the pump itself where
impurities are separated from the media grains by the
turbulent mixing action. The contaminated media spills from
the pump outlet into the washer labyrinth (6) in which it
Process
Air
is washed by a small counter current ow of clean water.
Filtration
Zone
The separated solids and sloughed biomass (brown arrow)
are discharged through the wash water outlet (7), while the
Aerator
grains of clean media (which are heavier) are returned to
the media bed (8). As a result, the bed is in slow, constant
1
downward motion through the unit. Compressed air for the
Feed Distributor
Thus, water purication and media washing both take place
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continuously enabling the lter to remain in service without
interruption.
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Entrapped Solids
Zone
air lift pump is provided via the air distribution panel.
turning water around ...®
Tel: 01353 645700 • Fax: 01353 645702 • www.hydro-int.com