PUMPS AND PUMPING SYSTEMS
Magnificent Severn
With a regeneration programme under way in Gloucester, Netheridge
sewage treatment works was coming under increased pressure, so
Discharge chamber entry points
Severn Trent Water turned to Pump Supplies for support
G
loucester is undergoing a period of maintain flows to the works if one or more of the was engineered. We quickly mobilised our
major investment, with a £1B screw pumps continued to fail. personnel and stocks so that the selected
regeneration programme bringing Rob Bessant, Pump Supplies’ representative, pumps and associated equipment for the job
homes, public squares, restaurants and shops to comments: “We received the classic late Friday were prepared on the Saturday, and installed,
the city to attract new businesses and residents. afternoon call from Severn Trent Water to see if fabricated and secured with lifting chains on
Netheridge, operated by Severn Trent Water, is we could supply pumps and equipment to act site during Sunday. By Monday evening the
the city’s main sewage treatment works and is in the place of the second screw pump pumps were available to run.”
served by more than 30 outstations. It treats the immediately. We visited the site that afternoon – Pump Supplies immediate response thus
effluent of all the city centre properties and made easier by the fact that the STW was only ensured a contingency was provided at the
some 80% of those in the surrounding areas, 1.5 miles from our depot in Gloucester. treatment works within 48 hours of the client’s
equating to a population of 50,000-200,000. “Following the site assessment a solution initial enquiry. ■■■
Situated next to the River Severn, Netheridge
STW is a large urban site that has been
significantly upgraded to anticipate Gloucester’s
regeneration and future peak flow demands.
It operates a traditional process, initially screening PUMPING SOLIDS...
the untreated sewage, then blending it with raw
activated sewage before sending it to the
distribution chamber, primary settlement tanks
and on to the site’s aeration tanks. The site does
produce a sludge cake, which is used by the
agricultural and farming industry.
Although the pumps had been installed
since the 1980s, a series of gearbox and
bearing breakdowns began to occur. While
these were periodic, the site is a critical
element of the treatment process for
Gloucester city centre and needs to remain
operational at all times. At one point, two out
of the three screw pumps broke down, and as
they could not be repaired or replaced quickly,
...It’s wise to invest for a marathon, not a sprint
Severn Trent Water turned to Pump Supplies’
Gloucester depot for over-pumping support, as
it simply could not rely on just one pump with
For the cost-effective pumping of solids from efficient solids pump-
no back-up alternative.
Raw Sewage to Digested Sludge, Inlet to Outfall ing 24/7, even in the
The site’s peak flows are early morning and in
means to think of LONG TERM not SHORT most challenging envi-
TERM solutions. ronments where RAG,
the evening, so Severn Trent needed a reliable
Factoring in whole life- FAT, HAIR and the like
system to handle the rise and fall of the flows
cycle costs is the win- will block other 'solids
during this time. The criterion was for temporary
ning investment for the handling' pumps.
pumps that could supply 1,000 l/s at 11m static
long run to the line.
head over a 40m discharge length within a short
Wet Well, Dry Well, Submersible or Self-priming
time frame, so it could be confident it could
VAUGHAN chopper whatever your solids pumping application.
pumps are designed
The pumps in place
and built to outrun Invest in VAUGHAN to not only complete the
the marathon that is marathon but to also CUT your life cycle costs.
saving you money in the long run
www.pandmpumps.co.uk sales@thesolidsolution.co.uk tel: 01487 830123
November 2009 Water & Wastewater Treatment 39
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