Watson-Marlow Bredel supplied their peristaltic pumps for installation at the Buckton Castle WTW to overcome blockage problems caused by the dosing of viscous lime slurry during the water treatment process.
The viscous lime slurry used to maintain a neutral pH during the water treatment process was causing frequent blockages in the diaphragm pumps employed by Buckton Castle Waste Treatment Works.
The two peristaltic hose pumps supplied by Watson-Marlow Bredel have overcome this problem, substantially reducing the time and cost of maintenance required.
Buckton Castle WTW based in Mossley near Manchester supplies up to 50 megalitres of water a day to over 120,000 people in the Tame Valley. The water is supplied to the site from reservoirs in the Greenfield and Swineshaw Valleys.
The water treatment process requires lime slurry to be added to the water supply at several points in the system to maintain the required pH level.
The alkaline solution is added first during the coagulation process, which causes unwanted particles in the water to stick together so that they can be extracted from the solution.
Further along the system, lime slurry is again dosed into the water to correct the pH during two stages of filtration before it enters supply pipelines.
Diaphragm pumps were used by Buckton Castle WTW to achieve this dosage but low flow rates caused the pumps to become blocked with the viscous slurry, causing maintenance problems and increased downtime.
The problem was resolved with the installation of peristaltic pumps from Watson-Marlow Bredel, wherein liquid is drawn into a tube and pushed through it by the action of rollers.
Nothing but the tube is ever in contact with the fluid eliminating the risk of the fluid contaminating the pump, or the pump contaminating the fluid.
Should the product ever enter the pump casing, it will not cause a problem as the chamber level switch will stop the pump.
The hose is the only part of the pump subject to wear and can be replaced easily without dismantling the pump.
Buckton Castle WTW is currently using 10 Watson-Marlow Bredel peristaltic pumps including SPX15 units and SPX25 units.
Both models are capable of pumping viscous and high density fluids, while the accuracy of the flow rate (±1%) makes them highly suitable for dosing applications.
Importantly for Buckton Castle, they are also fitted with camlock connectors, so that any problem can be fixed quickly and efficiently.
The SPX25 features an enhanced hose clamping and flange design, which significantly reduces the time to change the hose, and also improves the effectiveness of the sealing system.
Watson-Marlow Bredel’s peristaltic pumps prevent backflow, eliminating the need for valves and significantly reducing blockages.
The dosing pumps are fitted with a number of safety features including pressure relief switches to pump back any excess force into the suction system as well as pressure sensors that will indicate if the system is running correctly.