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 possibility compared to conventional pumped techniques.
A te-sewpas unit at Stocksbridge.
When Yorkshire Water decided to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a major housing development, the temporary to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low operating cost. The relocation also allowed for an upgrade from thirteen,000 inhabitants to fifteen,000 for the 2030 design horizon.
The new £15.65 million works consists of duty/standby fantastic screens, a vortex grit removing unit and two 15.5m diameter main settling tanks followed 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 and then flows by gravity to re-enter the method upstream of the first settlement tanks.
Simple, low opex sludge pumping

For this critical duty, MMB selected the te-sewpas pulsed air lift pump system supplied by Te-Tech Process Solutions. The self-contained unit incorporates a four.6kW duty side channel air blower, actuated air management valves, air manifold and control panel housed inside a weatherproof GRP enclosure and is delivered to web site totally assembled and examined. ไดอะแฟรม of air lifts a amount of sludge and discharges it from the sludge discharge pipe. A programmable timer in the PLC allows the frequency and period of desludging to be adjusted to allow the sludge to consolidate thus eliminating any potential ‘rat-holing’ and ensuring constant desludging.
The unit may be positioned near the tanks that it serves with versatile air supply hoses routed via ducts to each of the desludge chambers. The air delivered is scorching and consequently there is no need for thermal lagging or insulation. Each te-sewpas unit can serve as much as 4 major or humus tanks with typical individual air supply hose length up to 35m.
At Stocksbridge, a single Type B te-sewpas unit with duty/standby air blowers serves the 2 humus tanks. Rather than using the standard control panel, MMB determined to combine the te-sewpas controls into the central PLC and Te-Tech provided a functional design specification for this function. The project was accomplished in October 2019. “We’ve been utilizing the air raise systems of various makes on our websites for the last 20–25 years,” says Yorkshire Water’s Wastewater Asset Planning Sponsor Jan Buczylo, “The te-sewpas is particularly strong and we determined to retrofit additional systems in place of standard progressive cavity pumps at each Stillington and Sutton-on-the-Forest.” Installation of these two techniques was accomplished in April 2021.
Significant whole life price savings

The te-sewpas system supplies significant complete life cost financial savings when in comparability with standard pumped systems. For a typical set up serving two tanks, like the Stocksbridge challenge, based on an estimated 25% discount within the electrical power consumption and decreased upkeep necessities, te-sewpas offers a 40% decrease capital value and 50% reduction in operational price compared to a pumped desludge system.

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