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The Head Works Building
The headwork’s provides
pre-treatment of the wastewater through the removal of rags and other large
debris via the automatic Lakeside Rotamat screen and removal of sand and
grit via the Wemco-Hydrogritter separator.
Centrifugal Grit Removal System
The Centrifugal Grit Removal System has three major components, a pump, a
cyclone
separator/concentrator and a dewatering/washing classifier.
The System operates on the vortex principal by creating a circular whirling
pattern
to the wastewater. The wastewater enters the grit chamber at the outside of
the
chamber, causing a circular motion to the wastewater. This circular pattern
causes
heavier solid to concentrate in the centre bottom of the grit chamber,
similar to
coffee grounds in the bottom of a cup that has been swirled. The vortex is
created
by the shape of the grit chamber and by the propeller in the middle of the
chamber.
The propeller drives the heavier solids to the bottom of the grit chamber as
well as
enhancing the circular pattern of the wastewater flow.
The pump pulls grit from the grit chamber and feeds it to the cyclone
separator. The
grit is then captured, concentrated and discharged into the spiral
classifier, where
it is washed and dewatered.
The preliminarily treated wastewater flows from the top centre margin of the
chamber.
Solids that have settled to the bottom are removed by the Grit Pumps.
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