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 advantages of a pulsed air lift sludge pumping option compared to conventional pumped methods.
A te-sewpas unit at Stocksbridge.
When pressure gauge 10 bar decided to relocate Stocksbridge Wastewater Treatment Works 2km to the south to allow a serious housing improvement, the transient to Mott MacDonald Bentley (MMB) was for reliability, sustainability and low working price. The relocation additionally allowed for an upgrade from 13,000 population to 15,000 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 major settling tanks followed by organic treatment 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 and then flows by gravity to re-enter the method upstream of the first settlement tanks.
Simple, low opex sludge pumping

For this crucial 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 obligation side channel air blower, actuated air control valves, air manifold and control panel housed inside a weatherproof GRP enclosure and is delivered to web site fully assembled and examined. Each pulse 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 duration 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 flexible air supply hoses routed via ducts to each of the desludge chambers. The air delivered is sizzling and in consequence there isn’t a need for thermal lagging or insulation. Each te-sewpas unit can serve up to four main or humus tanks with typical particular person air delivery 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 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. pressure gauge was accomplished in October 2019. “We’ve been utilizing the air lift techniques of various 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 determined to retrofit extra systems instead of conventional progressive cavity pumps at both Stillington and Sutton-on-the-Forest.” Installation of those two systems was completed in April 2021.
Significant whole life price financial savings

The te-sewpas system provides significant whole life price financial savings when compared to typical pumped systems. For a typical installation serving two tanks, just like the Stocksbridge venture, based mostly on an estimated 25% reduction within the electrical power consumption and reduced maintenance requirements, te-sewpas offers a 40% lower capital value and 50% discount in operational price in comparability with a pumped desludge system.

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