Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air raise sludge pumping possibility in comparison with standard pumped techniques.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water determined to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a significant housing improvement, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating price. The relocation additionally allowed for an improve from thirteen,000 inhabitants to 15,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby nice screens, a vortex grit elimination unit and two 15.5m diameter primary settling tanks adopted by organic remedy in seven trickling filters with two 16.7m humus settlement tanks. Sludge produced within Nothing to it is delivered to a chamber alongside the tanks and then flows by gravity to re-enter the method upstream of the first settlement tanks.
Simple, low opex sludge pumping
For this crucial duty, MMB chosen the te-sewpas pulsed air raise pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a 4.6kW obligation side channel air blower, actuated air control valves, air manifold and control panel housed within a weatherproof GRP enclosure and is delivered to website totally assembled and tested. Each pulse of air lifts a amount of sludge and discharges it from the sludge discharge pipe. A programmable timer within the PLC permits the frequency and length of desludging to be adjusted to permit the sludge to consolidate thus eliminating any potential ‘rat-holing’ and making certain constant desludging.
The unit could be situated close to the tanks that it serves with versatile air supply hoses routed via ducts to every of the desludge chambers. The air delivered is sizzling and in consequence there is not a want for thermal lagging or insulation. Each te-sewpas unit can serve up to 4 primary or humus tanks with typical individual air supply hose length as a lot as 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the two humus tanks. Rather than utilizing the standard management panel, MMB determined to combine the te-sewpas controls into the central PLC and Te-Tech offered a functional design specification for this purpose. The project was accomplished in October 2019. “We’ve been using the air lift methods of varied makes on our websites for the final 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly robust and we decided to retrofit extra systems rather than standard progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of these two methods was accomplished in April 2021.
Significant whole life value savings
The te-sewpas system provides vital complete life value financial savings when in comparability with conventional pumped systems. For a typical set up serving two tanks, just like the Stocksbridge venture, based on an estimated 25% discount within the electrical power consumption and lowered upkeep requirements, te-sewpas offers a 40% lower capital value and 50% reduction in operational price compared to a pumped desludge system.
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