Yorkshire Water makes use of Te-Tech air-lift pumping for wastewater duties

Mike Froom, Business Development Director for Te-Tech Process Solutions in Southampton, UK, explores the benefits of a pulsed air raise sludge pumping choice in comparability with conventional pumped techniques.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water decided to relocate Stocksbridge Wastewater Treatment Works 2km to the south to permit a serious housing improvement, the temporary to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating value. The relocation additionally allowed for an upgrade from 13,000 population to fifteen,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 major settling tanks adopted by organic therapy in seven trickling filters with two 16.7m humus settlement tanks. Sludge produced in the humus settlement tanks is delivered to a chamber alongside the tanks and then flows by gravity to re-enter the method upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this important responsibility, MMB chosen the te-sewpas pulsed air carry pump system provided by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW duty aspect channel air blower, actuated air management valves, air manifold and management panel housed within a weatherproof GRP enclosure and is delivered to site totally assembled and examined. 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 allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and guaranteeing constant desludging.
The unit could be located close to the tanks that it serves with flexible air supply hoses routed via ducts to each of the desludge chambers. The air delivered is hot and in consequence there is no need for thermal lagging or insulation. Each te-sewpas unit can serve up to 4 major 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 usual management panel, MMB determined to integrate the te-sewpas controls into the central PLC and Te-Tech offered a functional design specification for this purpose. Undiscovered was accomplished in October 2019. “We’ve been utilizing the air carry methods of varied makes on our sites for the final 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is especially strong and we decided to retrofit extra methods in place of standard progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of these two systems was completed in April 2021.
Significant entire life value financial savings
The te-sewpas system offers important entire life price financial savings when compared to standard pumped techniques. For a typical set up serving two tanks, like the Stocksbridge project, based on an estimated 25% reduction in the electrical power consumption and reduced maintenance necessities, te-sewpas provides a 40% decrease capital value and 50% reduction in operational cost compared to a pumped desludge system.
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