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PHOsphate Removal System
Treatment plants are highly effective at breaking down sewage to the extent that their effluent may be permitted to
discharge directly to watercourses such as streams and rivers.
However, while they can biologically break down the main pollutants (BOD, suspended solids and ammonia) most small treatment
plants do not have the ability to reduce phosphates, an element commonly found in detergents and human waste.
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Why Phosphates Can Be Harmful
Phosphates are a nutrient and their presence encourages new
growth, but problems can arise when too much phosphate
over-enriches the water. This upsets the natural balance and
leads to an accelerated growth of algae and higher forms of
plant life.
In order to protect sensitive areas, local authorities and
environmental agencies are increasingly stipulating the use of
sewage treatment systems that produce very low levels of
phosphate discharge. This has resulted in increased costs
requiring the purchase of specialised treatment systems.
The PHORS Tank Solution
The Klargester PHORS (Phosphate Removal System) tank has
been specifically designed to work in series with the standard
AirFlow range of treatment plants. It is a self-contained single
tank that is comprised of an internal settlement chamber and
chemical dosing system.
Installed in conjunction with an AirFlow treatment plant it can
reduce phosphate levels to 2mg/l in typical applications.
Process Description
After receiving biological treatment in the AirFlow plant, sewage
effluent flows by gravity into the first of the PHORS Tank's two
chambers. This first compartment serves as a holding chamber.
At pre-set intervals a controlled volume of effluent is pumped into
the second chamber where a chemical is automatically added.
The chemical becomes mixed with the transferred effluent and
causes the phosphate to coagulate with the solid waste particles,
ending up as sludge that must be periodically removed. The now
highly clarified effluent is then allowed to discharge out of the
PHORS Tank to the designated watercourse or disposal area. |
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System Requirements
A power supply is required at all times to ensure the controlled
transfer of liquid through the internal pump and the required
chemical dose.
The unit also features a control panel that allows both the
chemical dose and transferred volume to be varied according to
the expected daily volume and level of phosphate in the influent.
Chemical Treatment
The PHORS Tank system treats phosphate with an iron
compound (liquid ferric chloride 40%).
The chemical will require storage in a separate unit in an
appropriate location, sized to suit the daily dosing and supplier's
container volume. Klargester can supply a variety of secure
kiosks to suit most applications, or alternatively the components
can be fitted into a suitable facility/enclosure.
Installation
The PHORS Tank is installed below ground, connected in series
to the outlet of the main AirFlow treatment plant. The unit
requires a minimum fall of 50mm to permit gravity flow and
consideration should be made for desludging access.
The chemical storage kiosk and control panel should be located
within 3 metres of the PHORS Tank's first manhole cover and will
require it's own electrical supply.
Advice
The information in this sales literature is by necessity, brief.
For further technical literature or assistance on sizing please
contact Klargester who will be pleased to assist. |
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