A520 DuN/REM high pressure
peristaltic pump from
Watson-Marlow Pumps
Group has met the immediate needs
of three chemical dosing schemes
implemented at various Severn Trent
Water facilities. Deployed as part of a
temporary dosing rig constructed by
engineering group, Costain, the
pump’s success is helping to pave the
way for future consideration of
peristaltic technology. Severn Trent’s
historical preference had been to use
conventional metering pumps.

Configured by Costain as part of
a portable, temporary dosing rig, the
peristaltic-based system has proved
successful on three Severn Trent
Water schemes. According to Paul
Pearson, process commissioning
engineer at Costain Pearson, there
are at least six more such applications
planned for the next 12 months, all
of which will use peristaltic
technology from Watson-Marlow,
although some are larger schemes
which might demand a higher flow
rate specification than the 520 DuN/
REM model (108L/h at 4.1 bar).

So far, the pump has been used
for ferrous chloride and ferric sulphate
dosing. These coagulants bind with
phosphates in wastewater so they can
be removed as sludge.