Product category:
Potable water, test and treatment
News Release from: Watson-Marlow Bredel Pumps | Subject: Blackmoorfoot WTW SPX 40
Edited by the Processingtalk Editorial
Team on 26 February 2008
Lime slurry dosing uses peristaltic
pumps 24/7
Peristaltic pumps supplied by Watson-Marlow Bredel are delivering trouble-free, 24 hour operation of lime slurry dosing for Yorkshire Water at the Blackmoorfoot WTW near Huddersfield
Serving over 400,000 people, the WTW at Blackmoorfoot was the first full-size three-stage water treatment works to be built by Yorkshire Water Pumping around 30 megalitres of water a day, the three-stage process involves flotation, first-stage filtration and subsequent manganese and chlorine removal, all in three distinct stages
This article was originally published on Processingtalk on 10 Jun 2008 at 8.00am (UK)
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This has been successful in treating upland Pennine waters and, as a result, water quality throughout the area has improved.
A critical aspect of the water treatment process at Blackmoorfoot is the addition of lime slurry, to control the pH of the water.
Water enters the works with a pH of around 6 and is then is then dosed with ferric sulphate and brought to a pH of 3.5.
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Lime is then added to aid flocculation at the first stage of filtration - bringing the water to pH4.2 before more lime is dosed - which brings the level to pH6.8.
At the second stage of filtration - before the water leaves the site - further alkaline lime slurry is metered to the supply in order to maintain the required pH level.
The lime raises the pH to around 9.2, which assists in the removal of naturally occurring manganese.
According to Joe Kelly, Process Engineer at the Blackmoorfoot Works, peristaltic technology offers distinct advantages over other types of pump.
"We've been using the Watson-Marlow Bredel pumps on site for at least seven years - and they have truly delivered trouble free operation.
This cannot be said of all of the peristaltic pumps we have installed on other sites: we have found that pumps from other well known suppliers are often prone to failure - particularly the inverters and motors.
This can result in unnecessary downtime and high maintenance costs".
The process control engineers at Blackmoorfoot WTW use 6 separate Watson-Marlow Bredel SPX 40 hose pumps to handle the lime dosing: three of these pumps run 24hours a day - and the remaining three pumps are used as duty / stand-by units.
With a maximum flow 6000 l/h and discharge pressure 16 bar, the Watson-Marlow Bredel SPX 40 is part of their family of SPX direct-coupled hose pumps.
Designed to provide all of the performance, reliability and ease-of-maintenance benefits of bareshaft (long-coupled) designs with the compact advantages of close-coupled pumps, the SPX range is available in sizes ranging from 10mm to 100mm.
Unlike close-coupling, the Watson-Marlow Bredel patented direct-coupled design permits the drive to be removed and replaced without the need to dismantle the pumphead. Request a free brochure from Watson-Marlow Bredel Pumps ...
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