Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air lift sludge pumping option compared to conventional pumped techniques.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water determined to relocate Stocksbridge Wastewater Treatment Works 2km to the south to permit a significant housing improvement, the temporary to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working value. The relocation also allowed for an improve from thirteen,000 population to 15,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby nice screens, a vortex grit removing unit and two 15.5m diameter main settling tanks adopted by biological treatment in seven trickling filters with two sixteen.7m humus settlement tanks. Sludge produced within the humus settlement tanks is delivered to a chamber alongside the tanks after which flows by gravity to re-enter the method upstream of the first settlement tanks.
Simple, low opex sludge pumping
For this critical responsibility, MMB chosen the te-sewpas pulsed air raise pump system provided by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW responsibility facet channel air blower, actuated air control valves, air manifold and management panel housed within a weatherproof GRP enclosure and is delivered to site absolutely assembled and examined. Each pulse of air lifts a quantity of sludge and discharges it from the sludge discharge pipe. A programmable timer within the PLC permits the frequency and duration of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and guaranteeing constant desludging.
The unit can be located close to the tanks that it serves with flexible air delivery hoses routed by way of ducts to every of the desludge chambers. Improved delivered is hot and as a result there is not any want for thermal lagging or insulation. Each te-sewpas unit can serve up to four major or humus tanks with typical individual air delivery hose length up to 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the two humus tanks. Rather than using the usual control panel, MMB decided to combine the te-sewpas controls into the central PLC and Te-Tech offered a useful design specification for this purpose. The challenge was accomplished in October 2019. “We’ve been utilizing the air raise systems 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 especially strong and we determined to retrofit extra techniques in place of typical progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of these two techniques was completed in April 2021.
Significant entire life price savings
The te-sewpas system supplies vital whole life price savings when compared to typical pumped methods. For Premiere up serving two tanks, like the Stocksbridge venture, based on an estimated 25% reduction within the electrical energy consumption and lowered maintenance necessities, te-sewpas provides a 40% lower capital cost and 50% reduction in operational price in comparability with a pumped desludge system.
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