CE / ISO water filtering spiral grit separator for sewage treatment
Screw rotary speed(r/min)
Grit moisture content(%)
The CGS screw classifier system is a free-standing packaged
classifier for the separation of mineral grit from other solids and
water discharged by grit removal systems.
The unit can be sited adjacent to the point of collection. The
screw classifier system is designed to receive a mixture of grit
and water by a pump rising main or gravity feed. Pumps may be of
the centrifugal, positive displacement or air lift type.
A receiving header box on top of the screw classifier unit ensures
the correct pattern of feed. This water/solids mixture then enters
the settlement bowl of the screw classifier unit, where water level
is maintained by a series of weirs. A peripheral weir removes any
floating solids, and a second weir is positioned within the trough
wall to scalp off those other solids that are lighter than grit.
Alternatively, a hydro-cyclone can be used as a receiver for pumped
flow. This reduces the proportion of liquid delivered to the
classifier, yet retains mineral particles of the specified size
range. A hydro-cyclone also enhances the classification of grit
particles from lighter organic solids.
Set within the settlement bowl is the inclined Archimedean screw.
As the screw is rotated, settled solids are transported up the
incline to above water level. The grit product is dewatered as it
is elevated by the screw to a high dewatered as it is elevated by
the screw to a high discharge point. All extraneous solids and
water are drained to the main sewage flow.
1. Dewatering of grit from grit collection systems
2. Separation of organics from collected grit
3. Reduction of the pumped water volume to the classifier through
the use of grit cyclones
1. Classification for floating solids, settled solids and liquids
2. Mild steel coated or stainless steel construction
3. Free standing unit can be located next to collection container
4. Suitable for most grit removal systems
6. Automatic operation