Yorkshire Water uses 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 carry sludge pumping option in comparability with typical pumped systems.
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 growth, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working price. The relocation additionally allowed for an improve from 13,000 inhabitants to fifteen,000 for the 2030 design horizon.
The new £15.sixty five million works consists of duty/standby fine screens, a vortex grit removing unit and two 15.5m diameter primary settling tanks adopted by organic therapy in seven trickling filters with two sixteen.7m humus settlement tanks. Sludge produced in the humus settlement tanks is delivered to a chamber alongside the tanks after which flows by gravity to re-enter the process upstream of the primary settlement tanks.
Simple, low opex sludge pumping
For this important obligation, MMB selected the te-sewpas pulsed air raise pump system provided by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW obligation aspect channel air blower, actuated air management valves, air manifold and management panel housed inside 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 allows the frequency and period of desludging to be adjusted to permit the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring constant desludging.
The unit may be located close to the tanks that it serves with versatile air supply hoses routed by way of ducts to every of the desludge chambers. The air delivered is scorching and in consequence there isn’t a want for thermal lagging or insulation. Each te-sewpas unit can serve as a lot as 4 primary or humus tanks with typical particular person air supply hose size as much as 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the 2 humus tanks. Rather than utilizing the standard control panel, MMB decided to integrate the te-sewpas controls into the central PLC and Te-Tech provided a practical design specification for this function. The challenge was completed in October 2019. “ Authoritative ’ve been utilizing the air carry systems of various makes on our sites for the final 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly strong and we decided to retrofit extra methods instead of typical progressive cavity pumps at each 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 provides significant whole life cost financial savings when compared to conventional pumped methods. For Blacklisted serving two tanks, like the Stocksbridge challenge, based on an estimated 25% reduction in the electrical energy consumption and reduced maintenance necessities, te-sewpas provides a 40% decrease capital cost and 50% discount in operational value compared to a pumped desludge system.