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Submerged Aerated Filter - HSAF®
Submerged Aerated Filters are a well proven
technology for treating wastewaters. The Brightwater F.L.I. HSAF® unique design
provides a versatile static bed process using the BMax® floating media with
periodic cleaning cycles that offer the following system advantages:
High quality effluent
For
example the HSAF® can achieve 1mg/l ammonia in tertiary mode.
Small footprint
The HSAF® uses Bmax® media
which provides a high specific surface area (700m²/m³). This combined with the
high oxygen transfer efficiency achieved by the process air system results in
a high intensity process with a small footprint.
No sludge buildup
Automated cleaning cycle
periodically removes excess sludge whilst independently maintaining sludge age.
Low power usage
The high efficiency of the
process air system ensures a low air and power requirement.
User Friendly
Proven, simple & robust
process requires virtually no maintenance during normal operation.
Flexible delivery
Available as package or bespoke systems. Package
plant can be purchased, hired or is available for demonstration units. The
standard product is available in a range of four sizes, to treat up to 1000 PE
in a single unit. Bespoke designs provide scope for serving larger schemes.
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The Brightwater F.L.I. HSAF® is a biological process unit
designed to enable BOD and / or ammonia reduction.
In most applications the flow is pumped to the unit. The flow passes up
through the aerated biological treatment zone of BMax® media where the active
bacterial population metabolises the effluent to reduce the ammonia and / or
the overall Biological Oxygen Demand (BOD). The air for the biological
treatment is evenly distributed through each reactor by passing through a
process air grid located at the base of the aerated biological treatment zone.
BMax® media is a buoyant plastic media made
from 100% recycled materials which can also be recycled at the end of the
plant’s design life. Biomass grows on, within and between the media, providing
treatment. Suspended solids will also become entrapped by the biomass, and the
media voidage. Treated effluent is collected through a simple launder system
at the top of the reactor.
Over time biomass and feed solids accumulate
in the reactor and need to be removed. An automated clean cycle is used. The
clean cycle consists of an air scour and one or more desludge stages. The air
scour works by passing additional air through the air scour grid located at
the base of each reactor. The scour air creates turbulence and fluidises the
media releasing the excess solids and biomass. The reactor then undergoes a
settlement period enabling the media bed to repack and the solids to collect
at the base of the reactor. The solids are then removed from the base of the
reactor prior to the reactor being put back online.
During normal operation the HSAF® plant is a
completely automated process and requires little maintenance or operator
intervention.
For additional information please visit:
www.hsaf.com or download the HSAF®
product literature
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