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The Island of Jersey's population of 87,500, rely on one main waste treatment plant in the town of St Helier: the Bellesan Depot. Here, all solid, liquid and chemical waste from the 103 pumping stations and industrial sites is treated.
Serving a small island with limited space and high dependence on one site, the Estates of Jersey Public Services Department needed a totally reliable and effective pumping solution that could deal with the peaks and troughs of the holiday season and operate 24/7 - so they turned to Watson-Marlow Bredel.
High level of service
Over the years, Public Service Stores, part of the Jersey Government, have grown to trust a high level of service, quality and performance from Watson-Marlow Bredel’s peristaltic pumps and hoses.
The Bellesan Depot uses Watson-Marlow Bredel SP100 high-flow, high-pressure hose pumps for primary sludge transfer and digester feed.
Matthew McNulty, purchasing officer for Public Service Stores, comments: "With increasingly stringent levels of discharge consent and the need to constantly reduce operating costs, these critical processes must be carried out reliably.
Consistent and accurate
"That is why we have continued to use Watson-Marlow Bredel pumps over the past 20 years. They provide consistent and accurate performance and are self-priming and dry-running."
The six SP100s at Bellesan Depot feed sewage from settlement tanks into digesters, where all the methane gas is burnt off. The sludge is then moved to a drying plant where the moisture is removed and the remainder made into pellets.
The finer effluent is pumped to an ultra-violet plant for treatment and then into the sea.
Philip Bolton, business development manager from Watson-Marlow Bredel, explains the benefits of peristaltic pumps in sewerage treatment:
"With traditional positive-displacement technology such as progressive cavity pumps, operating costs are very high. When pumping abrasive sludge there is excessive wear on stators and rotors. The cavity design also means that fluid cannot be pumped as quickly or effectively.
Problems eliminated
"By adopting peristaltic technology, these problems are eliminated. The use of reinforced hoses that can easily be replaced also eliminates downtime associated with mechanical failure and the pumps are considerably cheaper to maintain."
Designed for continuous operation at pressures up to 16 bar/220 psi, the SP100 can easily handle most sewage treatment applications. The simple, glandless, "straight through" construction, without valves, vanes or impellers, can deal with heavy-duty waste treatment substances, including viscous and abrasive sludges and slurries, and other solid and semi-solids.
For more information on Watson-Marlow Bredel peristaltic pumps, please contact Heather Beale on 01326 370370 or visit www.watson-marlow.com.
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