Functional layout of CST Wastewater
Solutions’ in-channel rotary drum
technology
STRATALIGN'S
LIFTING SYSTEMS – ROBUST, DURABLE
Vacuum Lifting is increasingly
being recognised as the ideal
method of lifting almost any item in
a safe, gentle and effective manner.
Steel sheets, timber panels,
glass, bags, drums, and every
other conceivable item, airtight
or porous, can be moved around
the production area single handed
with ease. The option of a battery
powered vacuum lifter makes for
very versatile units.
Davit cranes provide lifting solutions
to water and wastewater treatment
plants. From lifting submersible
pumps and mixers, to raising filter
screens and positioning hopper
cars, Thern provides the right
equipment to get the job done.
Like all Stratalign products,
they’re made to meet the
conditions of their particular
environment with corrosionresistant
finishes in powder coat
paint, galvanised or stainless-steel
construction.
Workstation gantry’s are unique
lifting devices for industrial and
manufacturing environments. The
Erikkila ProSystem is very durable
with its closed profile design. The
systems surface is treated with
impact resistant powder coating –
or galvanised finish is also available.
Each system is carefully designed
to suit your unique workshop size
and shape that can either be ceiling
mounted or freestanding.
Contact Stratalign on 09 263 7725
or email sales@stratalign.co.nz
REN379
configuration of the design, in which
the screening drum is installed
horizontally semi-submerged in line
with the incoming wastewater. The
plate at the back of the drum directs
flow radially through the mesh to
optimise solids separation and selfcleaning.
The rotary drum is manufactured
from either self-cleaning wedgewire
for primary screening, or perforated
plate for fine pre-membrane
bioreactor (pre-MBR) screening.
It is washed by a system of spray
nozzles at a moderate pressure.
An internal hopper collects the
screenings, which are flumed out to
the integral lifting and dewatering
screw, to efficiently dewater and
reduce screenings volume. The
lifting screw is shaftless to avoid any
blockages, even in the presence
of long rags and fibrous products
and includes screen and screening
washing. Lifting and screenings
handling can also be conducted
outside the channel, which
increases options for additional
washing and dewatering, according
to individual applications, says Mr
Bambridge.
“Screening and the solids lifting and
dewatering are separate operations,
using high efficiency screening
technology to convert the high-flow,
low-solids wastewater to low-flow,
high-solids dewatering. Separate
screening and lifting equipment
makes access simpler for more
cost-effective housekeeping and
maintenance for lower whole-of-life
costs,” he says.
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